Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1 | |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 2 | /* audioopmodule - Module to detect peak values in arrays */ |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 3 | |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 4 | #define PY_SSIZE_T_CLEAN |
| 5 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 6 | #include "Python.h" |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 7 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 8 | typedef short PyInt16; |
| 9 | |
Guido van Rossum | 7b1e974 | 1994-08-29 10:46:42 +0000 | [diff] [blame] | 10 | #if defined(__CHAR_UNSIGNED__) |
| 11 | #if defined(signed) |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 12 | /* This module currently does not work on systems where only unsigned |
| 13 | characters are available. Take it out of Setup. Sorry. */ |
| 14 | #endif |
Guido van Rossum | 7b1e974 | 1994-08-29 10:46:42 +0000 | [diff] [blame] | 15 | #endif |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 16 | |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 17 | static const int maxvals[] = {0, 0x7F, 0x7FFF, 0x7FFFFF, 0x7FFFFFFF}; |
Tim Golden | fa6ab0f | 2013-10-31 10:25:47 +0000 | [diff] [blame] | 18 | /* -1 trick is needed on Windows to support -0x80000000 without a warning */ |
| 19 | static const int minvals[] = {0, -0x80, -0x8000, -0x800000, -0x7FFFFFFF-1}; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 20 | static const unsigned int masks[] = {0, 0xFF, 0xFFFF, 0xFFFFFF, 0xFFFFFFFF}; |
| 21 | |
| 22 | static int |
| 23 | fbound(double val, double minval, double maxval) |
| 24 | { |
| 25 | if (val > maxval) |
| 26 | val = maxval; |
| 27 | else if (val < minval + 1) |
| 28 | val = minval; |
Victor Stinner | f2b9a34 | 2013-05-07 23:49:15 +0200 | [diff] [blame] | 29 | return (int)val; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 30 | } |
| 31 | |
| 32 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 33 | /* Code shamelessly stolen from sox, 12.17.7, g711.c |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 34 | ** (c) Craig Reese, Joe Campbell and Jeff Poskanzer 1989 */ |
| 35 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 36 | /* From g711.c: |
| 37 | * |
| 38 | * December 30, 1994: |
| 39 | * Functions linear2alaw, linear2ulaw have been updated to correctly |
| 40 | * convert unquantized 16 bit values. |
| 41 | * Tables for direct u- to A-law and A- to u-law conversions have been |
| 42 | * corrected. |
| 43 | * Borge Lindberg, Center for PersonKommunikation, Aalborg University. |
| 44 | * bli@cpk.auc.dk |
| 45 | * |
| 46 | */ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 47 | #define BIAS 0x84 /* define the add-in bias for 16 bit samples */ |
| 48 | #define CLIP 32635 |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 49 | #define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */ |
| 50 | #define QUANT_MASK (0xf) /* Quantization field mask. */ |
| 51 | #define SEG_SHIFT (4) /* Left shift for segment number. */ |
| 52 | #define SEG_MASK (0x70) /* Segment field mask. */ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 53 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 54 | static PyInt16 seg_aend[8] = {0x1F, 0x3F, 0x7F, 0xFF, |
| 55 | 0x1FF, 0x3FF, 0x7FF, 0xFFF}; |
| 56 | static PyInt16 seg_uend[8] = {0x3F, 0x7F, 0xFF, 0x1FF, |
| 57 | 0x3FF, 0x7FF, 0xFFF, 0x1FFF}; |
| 58 | |
| 59 | static PyInt16 |
| 60 | search(PyInt16 val, PyInt16 *table, int size) |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 61 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 62 | int i; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 63 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 64 | for (i = 0; i < size; i++) { |
| 65 | if (val <= *table++) |
| 66 | return (i); |
| 67 | } |
| 68 | return (size); |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 69 | } |
| 70 | #define st_ulaw2linear16(uc) (_st_ulaw2linear16[uc]) |
| 71 | #define st_alaw2linear16(uc) (_st_alaw2linear16[uc]) |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 72 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 73 | static PyInt16 _st_ulaw2linear16[256] = { |
| 74 | -32124, -31100, -30076, -29052, -28028, -27004, -25980, |
| 75 | -24956, -23932, -22908, -21884, -20860, -19836, -18812, |
| 76 | -17788, -16764, -15996, -15484, -14972, -14460, -13948, |
| 77 | -13436, -12924, -12412, -11900, -11388, -10876, -10364, |
| 78 | -9852, -9340, -8828, -8316, -7932, -7676, -7420, |
| 79 | -7164, -6908, -6652, -6396, -6140, -5884, -5628, |
| 80 | -5372, -5116, -4860, -4604, -4348, -4092, -3900, |
| 81 | -3772, -3644, -3516, -3388, -3260, -3132, -3004, |
| 82 | -2876, -2748, -2620, -2492, -2364, -2236, -2108, |
| 83 | -1980, -1884, -1820, -1756, -1692, -1628, -1564, |
| 84 | -1500, -1436, -1372, -1308, -1244, -1180, -1116, |
| 85 | -1052, -988, -924, -876, -844, -812, -780, |
| 86 | -748, -716, -684, -652, -620, -588, -556, |
| 87 | -524, -492, -460, -428, -396, -372, -356, |
| 88 | -340, -324, -308, -292, -276, -260, -244, |
| 89 | -228, -212, -196, -180, -164, -148, -132, |
| 90 | -120, -112, -104, -96, -88, -80, -72, |
| 91 | -64, -56, -48, -40, -32, -24, -16, |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 92 | -8, 0, 32124, 31100, 30076, 29052, 28028, |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 93 | 27004, 25980, 24956, 23932, 22908, 21884, 20860, |
| 94 | 19836, 18812, 17788, 16764, 15996, 15484, 14972, |
| 95 | 14460, 13948, 13436, 12924, 12412, 11900, 11388, |
| 96 | 10876, 10364, 9852, 9340, 8828, 8316, 7932, |
| 97 | 7676, 7420, 7164, 6908, 6652, 6396, 6140, |
| 98 | 5884, 5628, 5372, 5116, 4860, 4604, 4348, |
| 99 | 4092, 3900, 3772, 3644, 3516, 3388, 3260, |
| 100 | 3132, 3004, 2876, 2748, 2620, 2492, 2364, |
| 101 | 2236, 2108, 1980, 1884, 1820, 1756, 1692, |
| 102 | 1628, 1564, 1500, 1436, 1372, 1308, 1244, |
| 103 | 1180, 1116, 1052, 988, 924, 876, 844, |
| 104 | 812, 780, 748, 716, 684, 652, 620, |
| 105 | 588, 556, 524, 492, 460, 428, 396, |
| 106 | 372, 356, 340, 324, 308, 292, 276, |
| 107 | 260, 244, 228, 212, 196, 180, 164, |
| 108 | 148, 132, 120, 112, 104, 96, 88, |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 109 | 80, 72, 64, 56, 48, 40, 32, |
| 110 | 24, 16, 8, 0 |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 111 | }; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 112 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 113 | /* |
| 114 | * linear2ulaw() accepts a 14-bit signed integer and encodes it as u-law data |
| 115 | * stored in a unsigned char. This function should only be called with |
| 116 | * the data shifted such that it only contains information in the lower |
| 117 | * 14-bits. |
| 118 | * |
| 119 | * In order to simplify the encoding process, the original linear magnitude |
| 120 | * is biased by adding 33 which shifts the encoding range from (0 - 8158) to |
| 121 | * (33 - 8191). The result can be seen in the following encoding table: |
| 122 | * |
| 123 | * Biased Linear Input Code Compressed Code |
| 124 | * ------------------------ --------------- |
| 125 | * 00000001wxyza 000wxyz |
| 126 | * 0000001wxyzab 001wxyz |
| 127 | * 000001wxyzabc 010wxyz |
| 128 | * 00001wxyzabcd 011wxyz |
| 129 | * 0001wxyzabcde 100wxyz |
| 130 | * 001wxyzabcdef 101wxyz |
| 131 | * 01wxyzabcdefg 110wxyz |
| 132 | * 1wxyzabcdefgh 111wxyz |
| 133 | * |
| 134 | * Each biased linear code has a leading 1 which identifies the segment |
| 135 | * number. The value of the segment number is equal to 7 minus the number |
| 136 | * of leading 0's. The quantization interval is directly available as the |
| 137 | * four bits wxyz. * The trailing bits (a - h) are ignored. |
| 138 | * |
| 139 | * Ordinarily the complement of the resulting code word is used for |
| 140 | * transmission, and so the code word is complemented before it is returned. |
| 141 | * |
| 142 | * For further information see John C. Bellamy's Digital Telephony, 1982, |
| 143 | * John Wiley & Sons, pps 98-111 and 472-476. |
| 144 | */ |
| 145 | static unsigned char |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 146 | st_14linear2ulaw(PyInt16 pcm_val) /* 2's complement (14-bit range) */ |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 147 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 148 | PyInt16 mask; |
| 149 | PyInt16 seg; |
| 150 | unsigned char uval; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 151 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 152 | /* u-law inverts all bits */ |
| 153 | /* Get the sign and the magnitude of the value. */ |
| 154 | if (pcm_val < 0) { |
| 155 | pcm_val = -pcm_val; |
| 156 | mask = 0x7F; |
| 157 | } else { |
| 158 | mask = 0xFF; |
| 159 | } |
| 160 | if ( pcm_val > CLIP ) pcm_val = CLIP; /* clip the magnitude */ |
| 161 | pcm_val += (BIAS >> 2); |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 162 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 163 | /* Convert the scaled magnitude to segment number. */ |
| 164 | seg = search(pcm_val, seg_uend, 8); |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 165 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 166 | /* |
| 167 | * Combine the sign, segment, quantization bits; |
| 168 | * and complement the code word. |
| 169 | */ |
| 170 | if (seg >= 8) /* out of range, return maximum value. */ |
| 171 | return (unsigned char) (0x7F ^ mask); |
| 172 | else { |
| 173 | uval = (unsigned char) (seg << 4) | ((pcm_val >> (seg + 1)) & 0xF); |
| 174 | return (uval ^ mask); |
| 175 | } |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 176 | |
| 177 | } |
| 178 | |
| 179 | static PyInt16 _st_alaw2linear16[256] = { |
| 180 | -5504, -5248, -6016, -5760, -4480, -4224, -4992, |
| 181 | -4736, -7552, -7296, -8064, -7808, -6528, -6272, |
| 182 | -7040, -6784, -2752, -2624, -3008, -2880, -2240, |
| 183 | -2112, -2496, -2368, -3776, -3648, -4032, -3904, |
| 184 | -3264, -3136, -3520, -3392, -22016, -20992, -24064, |
| 185 | -23040, -17920, -16896, -19968, -18944, -30208, -29184, |
| 186 | -32256, -31232, -26112, -25088, -28160, -27136, -11008, |
| 187 | -10496, -12032, -11520, -8960, -8448, -9984, -9472, |
| 188 | -15104, -14592, -16128, -15616, -13056, -12544, -14080, |
| 189 | -13568, -344, -328, -376, -360, -280, -264, |
| 190 | -312, -296, -472, -456, -504, -488, -408, |
| 191 | -392, -440, -424, -88, -72, -120, -104, |
| 192 | -24, -8, -56, -40, -216, -200, -248, |
| 193 | -232, -152, -136, -184, -168, -1376, -1312, |
| 194 | -1504, -1440, -1120, -1056, -1248, -1184, -1888, |
| 195 | -1824, -2016, -1952, -1632, -1568, -1760, -1696, |
| 196 | -688, -656, -752, -720, -560, -528, -624, |
| 197 | -592, -944, -912, -1008, -976, -816, -784, |
| 198 | -880, -848, 5504, 5248, 6016, 5760, 4480, |
| 199 | 4224, 4992, 4736, 7552, 7296, 8064, 7808, |
| 200 | 6528, 6272, 7040, 6784, 2752, 2624, 3008, |
| 201 | 2880, 2240, 2112, 2496, 2368, 3776, 3648, |
| 202 | 4032, 3904, 3264, 3136, 3520, 3392, 22016, |
| 203 | 20992, 24064, 23040, 17920, 16896, 19968, 18944, |
| 204 | 30208, 29184, 32256, 31232, 26112, 25088, 28160, |
| 205 | 27136, 11008, 10496, 12032, 11520, 8960, 8448, |
| 206 | 9984, 9472, 15104, 14592, 16128, 15616, 13056, |
| 207 | 12544, 14080, 13568, 344, 328, 376, 360, |
| 208 | 280, 264, 312, 296, 472, 456, 504, |
| 209 | 488, 408, 392, 440, 424, 88, 72, |
| 210 | 120, 104, 24, 8, 56, 40, 216, |
| 211 | 200, 248, 232, 152, 136, 184, 168, |
| 212 | 1376, 1312, 1504, 1440, 1120, 1056, 1248, |
| 213 | 1184, 1888, 1824, 2016, 1952, 1632, 1568, |
| 214 | 1760, 1696, 688, 656, 752, 720, 560, |
| 215 | 528, 624, 592, 944, 912, 1008, 976, |
| 216 | 816, 784, 880, 848 |
| 217 | }; |
| 218 | |
| 219 | /* |
| 220 | * linear2alaw() accepts an 13-bit signed integer and encodes it as A-law data |
| 221 | * stored in a unsigned char. This function should only be called with |
| 222 | * the data shifted such that it only contains information in the lower |
| 223 | * 13-bits. |
| 224 | * |
| 225 | * Linear Input Code Compressed Code |
| 226 | * ------------------------ --------------- |
| 227 | * 0000000wxyza 000wxyz |
| 228 | * 0000001wxyza 001wxyz |
| 229 | * 000001wxyzab 010wxyz |
| 230 | * 00001wxyzabc 011wxyz |
| 231 | * 0001wxyzabcd 100wxyz |
| 232 | * 001wxyzabcde 101wxyz |
| 233 | * 01wxyzabcdef 110wxyz |
| 234 | * 1wxyzabcdefg 111wxyz |
| 235 | * |
| 236 | * For further information see John C. Bellamy's Digital Telephony, 1982, |
| 237 | * John Wiley & Sons, pps 98-111 and 472-476. |
| 238 | */ |
| 239 | static unsigned char |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 240 | st_linear2alaw(PyInt16 pcm_val) /* 2's complement (13-bit range) */ |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 241 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 242 | PyInt16 mask; |
| 243 | short seg; |
| 244 | unsigned char aval; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 245 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 246 | /* A-law using even bit inversion */ |
| 247 | if (pcm_val >= 0) { |
| 248 | mask = 0xD5; /* sign (7th) bit = 1 */ |
| 249 | } else { |
| 250 | mask = 0x55; /* sign bit = 0 */ |
| 251 | pcm_val = -pcm_val - 1; |
| 252 | } |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 253 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 254 | /* Convert the scaled magnitude to segment number. */ |
| 255 | seg = search(pcm_val, seg_aend, 8); |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 256 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 257 | /* Combine the sign, segment, and quantization bits. */ |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 258 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 259 | if (seg >= 8) /* out of range, return maximum value. */ |
| 260 | return (unsigned char) (0x7F ^ mask); |
| 261 | else { |
| 262 | aval = (unsigned char) seg << SEG_SHIFT; |
| 263 | if (seg < 2) |
| 264 | aval |= (pcm_val >> 1) & QUANT_MASK; |
| 265 | else |
| 266 | aval |= (pcm_val >> seg) & QUANT_MASK; |
| 267 | return (aval ^ mask); |
| 268 | } |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 269 | } |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 270 | /* End of code taken from sox */ |
| 271 | |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 272 | /* Intel ADPCM step variation table */ |
| 273 | static int indexTable[16] = { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 274 | -1, -1, -1, -1, 2, 4, 6, 8, |
| 275 | -1, -1, -1, -1, 2, 4, 6, 8, |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 276 | }; |
| 277 | |
| 278 | static int stepsizeTable[89] = { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 279 | 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, |
| 280 | 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, |
| 281 | 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, |
| 282 | 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, |
| 283 | 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, |
| 284 | 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, |
| 285 | 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, |
| 286 | 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, |
| 287 | 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 288 | }; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 289 | |
Serhiy Storchaka | 23a7827 | 2013-11-11 07:47:35 +0200 | [diff] [blame] | 290 | #define GETINTX(T, cp, i) (*(T *)((unsigned char *)(cp) + (i))) |
| 291 | #define SETINTX(T, cp, i, val) do { \ |
| 292 | *(T *)((unsigned char *)(cp) + (i)) = (T)(val); \ |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 293 | } while (0) |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 294 | |
| 295 | |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 296 | #define GETINT8(cp, i) GETINTX(signed char, (cp), (i)) |
| 297 | #define GETINT16(cp, i) GETINTX(short, (cp), (i)) |
| 298 | #define GETINT32(cp, i) GETINTX(PY_INT32_T, (cp), (i)) |
| 299 | |
| 300 | #if WORDS_BIGENDIAN |
| 301 | #define GETINT24(cp, i) ( \ |
| 302 | ((unsigned char *)(cp) + (i))[2] + \ |
| 303 | (((unsigned char *)(cp) + (i))[1] << 8) + \ |
| 304 | (((signed char *)(cp) + (i))[0] << 16) ) |
| 305 | #else |
| 306 | #define GETINT24(cp, i) ( \ |
| 307 | ((unsigned char *)(cp) + (i))[0] + \ |
| 308 | (((unsigned char *)(cp) + (i))[1] << 8) + \ |
| 309 | (((signed char *)(cp) + (i))[2] << 16) ) |
| 310 | #endif |
| 311 | |
| 312 | |
| 313 | #define SETINT8(cp, i, val) SETINTX(signed char, (cp), (i), (val)) |
| 314 | #define SETINT16(cp, i, val) SETINTX(short, (cp), (i), (val)) |
| 315 | #define SETINT32(cp, i, val) SETINTX(PY_INT32_T, (cp), (i), (val)) |
| 316 | |
| 317 | #if WORDS_BIGENDIAN |
| 318 | #define SETINT24(cp, i, val) do { \ |
| 319 | ((unsigned char *)(cp) + (i))[2] = (int)(val); \ |
| 320 | ((unsigned char *)(cp) + (i))[1] = (int)(val) >> 8; \ |
| 321 | ((signed char *)(cp) + (i))[0] = (int)(val) >> 16; \ |
| 322 | } while (0) |
| 323 | #else |
| 324 | #define SETINT24(cp, i, val) do { \ |
| 325 | ((unsigned char *)(cp) + (i))[0] = (int)(val); \ |
| 326 | ((unsigned char *)(cp) + (i))[1] = (int)(val) >> 8; \ |
| 327 | ((signed char *)(cp) + (i))[2] = (int)(val) >> 16; \ |
| 328 | } while (0) |
| 329 | #endif |
| 330 | |
| 331 | |
| 332 | #define GETRAWSAMPLE(size, cp, i) ( \ |
| 333 | (size == 1) ? (int)GETINT8((cp), (i)) : \ |
| 334 | (size == 2) ? (int)GETINT16((cp), (i)) : \ |
| 335 | (size == 3) ? (int)GETINT24((cp), (i)) : \ |
| 336 | (int)GETINT32((cp), (i))) |
| 337 | |
| 338 | #define SETRAWSAMPLE(size, cp, i, val) do { \ |
| 339 | if (size == 1) \ |
| 340 | SETINT8((cp), (i), (val)); \ |
| 341 | else if (size == 2) \ |
| 342 | SETINT16((cp), (i), (val)); \ |
| 343 | else if (size == 3) \ |
| 344 | SETINT24((cp), (i), (val)); \ |
| 345 | else \ |
| 346 | SETINT32((cp), (i), (val)); \ |
| 347 | } while(0) |
| 348 | |
| 349 | |
| 350 | #define GETSAMPLE32(size, cp, i) ( \ |
| 351 | (size == 1) ? (int)GETINT8((cp), (i)) << 24 : \ |
| 352 | (size == 2) ? (int)GETINT16((cp), (i)) << 16 : \ |
| 353 | (size == 3) ? (int)GETINT24((cp), (i)) << 8 : \ |
| 354 | (int)GETINT32((cp), (i))) |
| 355 | |
| 356 | #define SETSAMPLE32(size, cp, i, val) do { \ |
| 357 | if (size == 1) \ |
| 358 | SETINT8((cp), (i), (val) >> 24); \ |
| 359 | else if (size == 2) \ |
| 360 | SETINT16((cp), (i), (val) >> 16); \ |
| 361 | else if (size == 3) \ |
| 362 | SETINT24((cp), (i), (val) >> 8); \ |
| 363 | else \ |
| 364 | SETINT32((cp), (i), (val)); \ |
| 365 | } while(0) |
| 366 | |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 367 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 368 | static PyObject *AudioopError; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 369 | |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 370 | static int |
| 371 | audioop_check_size(int size) |
| 372 | { |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 373 | if (size < 1 || size > 4) { |
| 374 | PyErr_SetString(AudioopError, "Size should be 1, 2, 3 or 4"); |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 375 | return 0; |
| 376 | } |
| 377 | else |
| 378 | return 1; |
| 379 | } |
| 380 | |
| 381 | static int |
Victor Stinner | 0fcab4a | 2011-01-04 12:59:15 +0000 | [diff] [blame] | 382 | audioop_check_parameters(Py_ssize_t len, int size) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 383 | { |
| 384 | if (!audioop_check_size(size)) |
| 385 | return 0; |
| 386 | if (len % size != 0) { |
| 387 | PyErr_SetString(AudioopError, "not a whole number of frames"); |
| 388 | return 0; |
| 389 | } |
| 390 | return 1; |
| 391 | } |
| 392 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 393 | /*[clinic input] |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 394 | module audioop |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 395 | [clinic start generated code]*/ |
Serhiy Storchaka | 1009bf1 | 2015-04-03 23:53:51 +0300 | [diff] [blame] | 396 | /*[clinic end generated code: output=da39a3ee5e6b4b0d input=8fa8f6611be3591a]*/ |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 397 | |
| 398 | /*[clinic input] |
| 399 | audioop.getsample |
| 400 | |
| 401 | fragment: Py_buffer |
| 402 | width: int |
| 403 | index: Py_ssize_t |
| 404 | / |
| 405 | |
| 406 | Return the value of sample index from the fragment. |
| 407 | [clinic start generated code]*/ |
| 408 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 409 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 410 | audioop_getsample_impl(PyModuleDef *module, Py_buffer *fragment, int width, |
| 411 | Py_ssize_t index) |
| 412 | /*[clinic end generated code: output=3995e189fdc8ec16 input=88edbe2871393549]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 413 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 414 | int val; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 415 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 416 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 417 | return NULL; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 418 | if (index < 0 || index >= fragment->len/width) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 419 | PyErr_SetString(AudioopError, "Index out of range"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 420 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 421 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 422 | val = GETRAWSAMPLE(width, fragment->buf, index*width); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 423 | return PyLong_FromLong(val); |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 424 | } |
| 425 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 426 | /*[clinic input] |
| 427 | audioop.max |
| 428 | |
| 429 | fragment: Py_buffer |
| 430 | width: int |
| 431 | / |
| 432 | |
| 433 | Return the maximum of the absolute value of all samples in a fragment. |
| 434 | [clinic start generated code]*/ |
| 435 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 436 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 437 | audioop_max_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 438 | /*[clinic end generated code: output=85047ee1001f2305 input=32bea5ea0ac8c223]*/ |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 439 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 440 | Py_ssize_t i; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 441 | unsigned int absval, max = 0; |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 442 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 443 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 444 | return NULL; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 445 | for (i = 0; i < fragment->len; i += width) { |
| 446 | int val = GETRAWSAMPLE(width, fragment->buf, i); |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 447 | if (val < 0) absval = (-val); |
| 448 | else absval = val; |
| 449 | if (absval > max) max = absval; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 450 | } |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 451 | return PyLong_FromUnsignedLong(max); |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 452 | } |
| 453 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 454 | /*[clinic input] |
| 455 | audioop.minmax |
| 456 | |
| 457 | fragment: Py_buffer |
| 458 | width: int |
| 459 | / |
| 460 | |
| 461 | Return the minimum and maximum values of all samples in the sound fragment. |
| 462 | [clinic start generated code]*/ |
| 463 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 464 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 465 | audioop_minmax_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 466 | /*[clinic end generated code: output=ae8f5513c64fd569 input=89848e9b927a0696]*/ |
Sjoerd Mullender | a142613 | 1994-09-06 16:19:33 +0000 | [diff] [blame] | 467 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 468 | Py_ssize_t i; |
Tim Golden | fa6ab0f | 2013-10-31 10:25:47 +0000 | [diff] [blame] | 469 | /* -1 trick below is needed on Windows to support -0x80000000 without |
| 470 | a warning */ |
| 471 | int min = 0x7fffffff, max = -0x7FFFFFFF-1; |
Sjoerd Mullender | a142613 | 1994-09-06 16:19:33 +0000 | [diff] [blame] | 472 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 473 | if (!audioop_check_parameters(fragment->len, width)) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 474 | return NULL; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 475 | for (i = 0; i < fragment->len; i += width) { |
| 476 | int val = GETRAWSAMPLE(width, fragment->buf, i); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 477 | if (val > max) max = val; |
| 478 | if (val < min) min = val; |
| 479 | } |
| 480 | return Py_BuildValue("(ii)", min, max); |
Sjoerd Mullender | a142613 | 1994-09-06 16:19:33 +0000 | [diff] [blame] | 481 | } |
| 482 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 483 | /*[clinic input] |
| 484 | audioop.avg |
| 485 | |
| 486 | fragment: Py_buffer |
| 487 | width: int |
| 488 | / |
| 489 | |
| 490 | Return the average over all samples in the fragment. |
| 491 | [clinic start generated code]*/ |
| 492 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 493 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 494 | audioop_avg_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 495 | /*[clinic end generated code: output=7fccd645c95f4860 input=1114493c7611334d]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 496 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 497 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 498 | int avg; |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 499 | double sum = 0.0; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 500 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 501 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 502 | return NULL; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 503 | for (i = 0; i < fragment->len; i += width) |
| 504 | sum += GETRAWSAMPLE(width, fragment->buf, i); |
| 505 | if (fragment->len == 0) |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 506 | avg = 0; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 507 | else |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 508 | avg = (int)floor(sum / (double)(fragment->len/width)); |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 509 | return PyLong_FromLong(avg); |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 510 | } |
| 511 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 512 | /*[clinic input] |
| 513 | audioop.rms |
| 514 | |
| 515 | fragment: Py_buffer |
| 516 | width: int |
| 517 | / |
| 518 | |
| 519 | Return the root-mean-square of the fragment, i.e. sqrt(sum(S_i^2)/n). |
| 520 | [clinic start generated code]*/ |
| 521 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 522 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 523 | audioop_rms_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 524 | /*[clinic end generated code: output=7b398702c81b709d input=4cc57c6c94219d78]*/ |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 525 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 526 | Py_ssize_t i; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 527 | unsigned int res; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 528 | double sum_squares = 0.0; |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 529 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 530 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 531 | return NULL; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 532 | for (i = 0; i < fragment->len; i += width) { |
| 533 | double val = GETRAWSAMPLE(width, fragment->buf, i); |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 534 | sum_squares += val*val; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 535 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 536 | if (fragment->len == 0) |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 537 | res = 0; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 538 | else |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 539 | res = (unsigned int)sqrt(sum_squares / (double)(fragment->len/width)); |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 540 | return PyLong_FromUnsignedLong(res); |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 541 | } |
| 542 | |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 543 | static double _sum2(const short *a, const short *b, Py_ssize_t len) |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 544 | { |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 545 | Py_ssize_t i; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 546 | double sum = 0.0; |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 547 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 548 | for( i=0; i<len; i++) { |
| 549 | sum = sum + (double)a[i]*(double)b[i]; |
| 550 | } |
| 551 | return sum; |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | /* |
| 555 | ** Findfit tries to locate a sample within another sample. Its main use |
| 556 | ** is in echo-cancellation (to find the feedback of the output signal in |
| 557 | ** the input signal). |
| 558 | ** The method used is as follows: |
| 559 | ** |
| 560 | ** let R be the reference signal (length n) and A the input signal (length N) |
| 561 | ** with N > n, and let all sums be over i from 0 to n-1. |
| 562 | ** |
| 563 | ** Now, for each j in {0..N-n} we compute a factor fj so that -fj*R matches A |
| 564 | ** as good as possible, i.e. sum( (A[j+i]+fj*R[i])^2 ) is minimal. This |
| 565 | ** equation gives fj = sum( A[j+i]R[i] ) / sum(R[i]^2). |
| 566 | ** |
| 567 | ** Next, we compute the relative distance between the original signal and |
| 568 | ** the modified signal and minimize that over j: |
| 569 | ** vj = sum( (A[j+i]-fj*R[i])^2 ) / sum( A[j+i]^2 ) => |
| 570 | ** vj = ( sum(A[j+i]^2)*sum(R[i]^2) - sum(A[j+i]R[i])^2 ) / sum( A[j+i]^2 ) |
| 571 | ** |
| 572 | ** In the code variables correspond as follows: |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 573 | ** cp1 A |
| 574 | ** cp2 R |
| 575 | ** len1 N |
| 576 | ** len2 n |
| 577 | ** aj_m1 A[j-1] |
| 578 | ** aj_lm1 A[j+n-1] |
| 579 | ** sum_ri_2 sum(R[i]^2) |
| 580 | ** sum_aij_2 sum(A[i+j]^2) |
| 581 | ** sum_aij_ri sum(A[i+j]R[i]) |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 582 | ** |
| 583 | ** sum_ri is calculated once, sum_aij_2 is updated each step and sum_aij_ri |
| 584 | ** is completely recalculated each step. |
| 585 | */ |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 586 | /*[clinic input] |
| 587 | audioop.findfit |
| 588 | |
| 589 | fragment: Py_buffer |
| 590 | reference: Py_buffer |
| 591 | / |
| 592 | |
| 593 | Try to match reference as well as possible to a portion of fragment. |
| 594 | [clinic start generated code]*/ |
| 595 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 596 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 597 | audioop_findfit_impl(PyModuleDef *module, Py_buffer *fragment, |
| 598 | Py_buffer *reference) |
| 599 | /*[clinic end generated code: output=609eedf5d823d6dd input=62c305605e183c9a]*/ |
Jack Jansen | dd8a6ea | 1993-02-17 14:21:09 +0000 | [diff] [blame] | 600 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 601 | const short *cp1, *cp2; |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 602 | Py_ssize_t len1, len2; |
| 603 | Py_ssize_t j, best_j; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 604 | double aj_m1, aj_lm1; |
| 605 | double sum_ri_2, sum_aij_2, sum_aij_ri, result, best_result, factor; |
Jack Jansen | dd8a6ea | 1993-02-17 14:21:09 +0000 | [diff] [blame] | 606 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 607 | if (fragment->len & 1 || reference->len & 1) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 608 | PyErr_SetString(AudioopError, "Strings should be even-sized"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 609 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 610 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 611 | cp1 = (const short *)fragment->buf; |
| 612 | len1 = fragment->len >> 1; |
| 613 | cp2 = (const short *)reference->buf; |
| 614 | len2 = reference->len >> 1; |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 615 | |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 616 | if (len1 < len2) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 617 | PyErr_SetString(AudioopError, "First sample should be longer"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 618 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 619 | } |
| 620 | sum_ri_2 = _sum2(cp2, cp2, len2); |
| 621 | sum_aij_2 = _sum2(cp1, cp1, len2); |
| 622 | sum_aij_ri = _sum2(cp1, cp2, len2); |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 623 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 624 | result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri) / sum_aij_2; |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 625 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 626 | best_result = result; |
| 627 | best_j = 0; |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 628 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 629 | for ( j=1; j<=len1-len2; j++) { |
| 630 | aj_m1 = (double)cp1[j-1]; |
| 631 | aj_lm1 = (double)cp1[j+len2-1]; |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 632 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 633 | sum_aij_2 = sum_aij_2 + aj_lm1*aj_lm1 - aj_m1*aj_m1; |
| 634 | sum_aij_ri = _sum2(cp1+j, cp2, len2); |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 635 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 636 | result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri) |
| 637 | / sum_aij_2; |
| 638 | |
| 639 | if ( result < best_result ) { |
| 640 | best_result = result; |
| 641 | best_j = j; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 642 | } |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 643 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | factor = _sum2(cp1+best_j, cp2, len2) / sum_ri_2; |
| 647 | |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 648 | return Py_BuildValue("(nf)", best_j, factor); |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | /* |
| 652 | ** findfactor finds a factor f so that the energy in A-fB is minimal. |
| 653 | ** See the comment for findfit for details. |
| 654 | */ |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 655 | /*[clinic input] |
| 656 | audioop.findfactor |
| 657 | |
| 658 | fragment: Py_buffer |
| 659 | reference: Py_buffer |
| 660 | / |
| 661 | |
| 662 | Return a factor F such that rms(add(fragment, mul(reference, -F))) is minimal. |
| 663 | [clinic start generated code]*/ |
| 664 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 665 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 666 | audioop_findfactor_impl(PyModuleDef *module, Py_buffer *fragment, |
| 667 | Py_buffer *reference) |
| 668 | /*[clinic end generated code: output=5566a8c55de54f99 input=816680301d012b21]*/ |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 669 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 670 | const short *cp1, *cp2; |
| 671 | Py_ssize_t len; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 672 | double sum_ri_2, sum_aij_ri, result; |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 673 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 674 | if (fragment->len & 1 || reference->len & 1) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 675 | PyErr_SetString(AudioopError, "Strings should be even-sized"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 676 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 677 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 678 | if (fragment->len != reference->len) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 679 | PyErr_SetString(AudioopError, "Samples should be same size"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 680 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 681 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 682 | cp1 = (const short *)fragment->buf; |
| 683 | cp2 = (const short *)reference->buf; |
| 684 | len = fragment->len >> 1; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 685 | sum_ri_2 = _sum2(cp2, cp2, len); |
| 686 | sum_aij_ri = _sum2(cp1, cp2, len); |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 687 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 688 | result = sum_aij_ri / sum_ri_2; |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 689 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 690 | return PyFloat_FromDouble(result); |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 691 | } |
| 692 | |
| 693 | /* |
| 694 | ** findmax returns the index of the n-sized segment of the input sample |
| 695 | ** that contains the most energy. |
| 696 | */ |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 697 | /*[clinic input] |
| 698 | audioop.findmax |
| 699 | |
| 700 | fragment: Py_buffer |
| 701 | length: Py_ssize_t |
| 702 | / |
| 703 | |
| 704 | Search fragment for a slice of specified number of samples with maximum energy. |
| 705 | [clinic start generated code]*/ |
| 706 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 707 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 708 | audioop_findmax_impl(PyModuleDef *module, Py_buffer *fragment, |
| 709 | Py_ssize_t length) |
| 710 | /*[clinic end generated code: output=01fe796fad2573bb input=2f304801ed42383c]*/ |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 711 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 712 | const short *cp1; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 713 | Py_ssize_t len1; |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 714 | Py_ssize_t j, best_j; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 715 | double aj_m1, aj_lm1; |
| 716 | double result, best_result; |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 717 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 718 | if (fragment->len & 1) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 719 | PyErr_SetString(AudioopError, "Strings should be even-sized"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 720 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 721 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 722 | cp1 = (const short *)fragment->buf; |
| 723 | len1 = fragment->len >> 1; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 724 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 725 | if (length < 0 || len1 < length) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 726 | PyErr_SetString(AudioopError, "Input sample should be longer"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 727 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 728 | } |
| 729 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 730 | result = _sum2(cp1, cp1, length); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 731 | |
| 732 | best_result = result; |
| 733 | best_j = 0; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 734 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 735 | for ( j=1; j<=len1-length; j++) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 736 | aj_m1 = (double)cp1[j-1]; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 737 | aj_lm1 = (double)cp1[j+length-1]; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 738 | |
| 739 | result = result + aj_lm1*aj_lm1 - aj_m1*aj_m1; |
| 740 | |
| 741 | if ( result > best_result ) { |
| 742 | best_result = result; |
| 743 | best_j = j; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 744 | } |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 745 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 746 | } |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 747 | |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 748 | return PyLong_FromSsize_t(best_j); |
Jack Jansen | dd8a6ea | 1993-02-17 14:21:09 +0000 | [diff] [blame] | 749 | } |
| 750 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 751 | /*[clinic input] |
| 752 | audioop.avgpp |
| 753 | |
| 754 | fragment: Py_buffer |
| 755 | width: int |
| 756 | / |
| 757 | |
| 758 | Return the average peak-peak value over all samples in the fragment. |
| 759 | [clinic start generated code]*/ |
| 760 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 761 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 762 | audioop_avgpp_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 763 | /*[clinic end generated code: output=06c8380fd6e34207 input=0b3cceeae420a7d9]*/ |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 764 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 765 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 766 | int prevval, prevextremevalid = 0, prevextreme = 0; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 767 | double sum = 0.0; |
| 768 | unsigned int avg; |
| 769 | int diff, prevdiff, nextreme = 0; |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 770 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 771 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 772 | return NULL; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 773 | if (fragment->len <= width) |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 774 | return PyLong_FromLong(0); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 775 | prevval = GETRAWSAMPLE(width, fragment->buf, 0); |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 776 | prevdiff = 17; /* Anything != 0, 1 */ |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 777 | for (i = width; i < fragment->len; i += width) { |
| 778 | int val = GETRAWSAMPLE(width, fragment->buf, i); |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 779 | if (val != prevval) { |
| 780 | diff = val < prevval; |
| 781 | if (prevdiff == !diff) { |
| 782 | /* Derivative changed sign. Compute difference to last |
| 783 | ** extreme value and remember. |
| 784 | */ |
| 785 | if (prevextremevalid) { |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 786 | if (prevval < prevextreme) |
| 787 | sum += (double)((unsigned int)prevextreme - |
| 788 | (unsigned int)prevval); |
| 789 | else |
| 790 | sum += (double)((unsigned int)prevval - |
| 791 | (unsigned int)prevextreme); |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 792 | nextreme++; |
| 793 | } |
| 794 | prevextremevalid = 1; |
| 795 | prevextreme = prevval; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 796 | } |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 797 | prevval = val; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 798 | prevdiff = diff; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 799 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 800 | } |
| 801 | if ( nextreme == 0 ) |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 802 | avg = 0; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 803 | else |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 804 | avg = (unsigned int)(sum / (double)nextreme); |
| 805 | return PyLong_FromUnsignedLong(avg); |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 806 | } |
| 807 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 808 | /*[clinic input] |
| 809 | audioop.maxpp |
| 810 | |
| 811 | fragment: Py_buffer |
| 812 | width: int |
| 813 | / |
| 814 | |
| 815 | Return the maximum peak-peak value in the sound fragment. |
| 816 | [clinic start generated code]*/ |
| 817 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 818 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 819 | audioop_maxpp_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 820 | /*[clinic end generated code: output=c300c0bd7e8535c0 input=671a13e1518f80a1]*/ |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 821 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 822 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 823 | int prevval, prevextremevalid = 0, prevextreme = 0; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 824 | unsigned int max = 0, extremediff; |
| 825 | int diff, prevdiff; |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 826 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 827 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 828 | return NULL; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 829 | if (fragment->len <= width) |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 830 | return PyLong_FromLong(0); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 831 | prevval = GETRAWSAMPLE(width, fragment->buf, 0); |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 832 | prevdiff = 17; /* Anything != 0, 1 */ |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 833 | for (i = width; i < fragment->len; i += width) { |
| 834 | int val = GETRAWSAMPLE(width, fragment->buf, i); |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 835 | if (val != prevval) { |
| 836 | diff = val < prevval; |
| 837 | if (prevdiff == !diff) { |
| 838 | /* Derivative changed sign. Compute difference to |
| 839 | ** last extreme value and remember. |
| 840 | */ |
| 841 | if (prevextremevalid) { |
| 842 | if (prevval < prevextreme) |
| 843 | extremediff = (unsigned int)prevextreme - |
| 844 | (unsigned int)prevval; |
| 845 | else |
| 846 | extremediff = (unsigned int)prevval - |
| 847 | (unsigned int)prevextreme; |
| 848 | if ( extremediff > max ) |
| 849 | max = extremediff; |
| 850 | } |
| 851 | prevextremevalid = 1; |
| 852 | prevextreme = prevval; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 853 | } |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 854 | prevval = val; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 855 | prevdiff = diff; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 856 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 857 | } |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 858 | return PyLong_FromUnsignedLong(max); |
Jack Jansen | e1b4d7c | 1992-08-24 14:36:31 +0000 | [diff] [blame] | 859 | } |
| 860 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 861 | /*[clinic input] |
| 862 | audioop.cross |
| 863 | |
| 864 | fragment: Py_buffer |
| 865 | width: int |
| 866 | / |
| 867 | |
| 868 | Return the number of zero crossings in the fragment passed as an argument. |
| 869 | [clinic start generated code]*/ |
| 870 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 871 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 872 | audioop_cross_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 873 | /*[clinic end generated code: output=99e6572d7d7cdbf1 input=b1b3f15b83f6b41a]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 874 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 875 | Py_ssize_t i; |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 876 | int prevval; |
| 877 | Py_ssize_t ncross; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 878 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 879 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 880 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 881 | ncross = -1; |
| 882 | prevval = 17; /* Anything <> 0,1 */ |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 883 | for (i = 0; i < fragment->len; i += width) { |
| 884 | int val = GETRAWSAMPLE(width, fragment->buf, i) < 0; |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 885 | if (val != prevval) ncross++; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 886 | prevval = val; |
| 887 | } |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 888 | return PyLong_FromSsize_t(ncross); |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 889 | } |
| 890 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 891 | /*[clinic input] |
| 892 | audioop.mul |
| 893 | |
| 894 | fragment: Py_buffer |
| 895 | width: int |
| 896 | factor: double |
| 897 | / |
| 898 | |
| 899 | Return a fragment that has all samples in the original fragment multiplied by the floating-point value factor. |
| 900 | [clinic start generated code]*/ |
| 901 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 902 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 903 | audioop_mul_impl(PyModuleDef *module, Py_buffer *fragment, int width, |
| 904 | double factor) |
| 905 | /*[clinic end generated code: output=1c7c31191ac86b10 input=c726667baa157d3c]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 906 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 907 | signed char *ncp; |
| 908 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 909 | double maxval, minval; |
| 910 | PyObject *rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 911 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 912 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 913 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 914 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 915 | maxval = (double) maxvals[width]; |
| 916 | minval = (double) minvals[width]; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 917 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 918 | rv = PyBytes_FromStringAndSize(NULL, fragment->len); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 919 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 920 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 921 | ncp = (signed char *)PyBytes_AsString(rv); |
| 922 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 923 | for (i = 0; i < fragment->len; i += width) { |
| 924 | double val = GETRAWSAMPLE(width, fragment->buf, i); |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 925 | val *= factor; |
| 926 | val = floor(fbound(val, minval, maxval)); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 927 | SETRAWSAMPLE(width, ncp, i, (int)val); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 928 | } |
| 929 | return rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 930 | } |
| 931 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 932 | /*[clinic input] |
| 933 | audioop.tomono |
| 934 | |
| 935 | fragment: Py_buffer |
| 936 | width: int |
| 937 | lfactor: double |
| 938 | rfactor: double |
| 939 | / |
| 940 | |
| 941 | Convert a stereo fragment to a mono fragment. |
| 942 | [clinic start generated code]*/ |
| 943 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 944 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 945 | audioop_tomono_impl(PyModuleDef *module, Py_buffer *fragment, int width, |
| 946 | double lfactor, double rfactor) |
| 947 | /*[clinic end generated code: output=553f547c5e29e3b6 input=c4ec949b3f4dddfa]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 948 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 949 | signed char *cp, *ncp; |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 950 | Py_ssize_t len, i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 951 | double maxval, minval; |
| 952 | PyObject *rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 953 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 954 | cp = fragment->buf; |
| 955 | len = fragment->len; |
| 956 | if (!audioop_check_parameters(len, width)) |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 957 | return NULL; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 958 | if (((len / width) & 1) != 0) { |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 959 | PyErr_SetString(AudioopError, "not a whole number of frames"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 960 | return NULL; |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 961 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 962 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 963 | maxval = (double) maxvals[width]; |
| 964 | minval = (double) minvals[width]; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 965 | |
| 966 | rv = PyBytes_FromStringAndSize(NULL, len/2); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 967 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 968 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 969 | ncp = (signed char *)PyBytes_AsString(rv); |
| 970 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 971 | for (i = 0; i < len; i += width*2) { |
| 972 | double val1 = GETRAWSAMPLE(width, cp, i); |
| 973 | double val2 = GETRAWSAMPLE(width, cp, i + width); |
| 974 | double val = val1*lfactor + val2*rfactor; |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 975 | val = floor(fbound(val, minval, maxval)); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 976 | SETRAWSAMPLE(width, ncp, i/2, val); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 977 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 978 | return rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 979 | } |
| 980 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 981 | /*[clinic input] |
| 982 | audioop.tostereo |
| 983 | |
| 984 | fragment: Py_buffer |
| 985 | width: int |
| 986 | lfactor: double |
| 987 | rfactor: double |
| 988 | / |
| 989 | |
| 990 | Generate a stereo fragment from a mono fragment. |
| 991 | [clinic start generated code]*/ |
| 992 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 993 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 994 | audioop_tostereo_impl(PyModuleDef *module, Py_buffer *fragment, int width, |
| 995 | double lfactor, double rfactor) |
| 996 | /*[clinic end generated code: output=697bb6ba41e9dd2c input=27b6395ebfdff37a]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 997 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 998 | signed char *ncp; |
| 999 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1000 | double maxval, minval; |
| 1001 | PyObject *rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1002 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1003 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1004 | return NULL; |
Amaury Forgeot d'Arc | 9c74b14 | 2008-06-18 00:47:36 +0000 | [diff] [blame] | 1005 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1006 | maxval = (double) maxvals[width]; |
| 1007 | minval = (double) minvals[width]; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1008 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1009 | if (fragment->len > PY_SSIZE_T_MAX/2) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1010 | PyErr_SetString(PyExc_MemoryError, |
| 1011 | "not enough memory for output buffer"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1012 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1013 | } |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1014 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1015 | rv = PyBytes_FromStringAndSize(NULL, fragment->len*2); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1016 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1017 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1018 | ncp = (signed char *)PyBytes_AsString(rv); |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1019 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1020 | for (i = 0; i < fragment->len; i += width) { |
| 1021 | double val = GETRAWSAMPLE(width, fragment->buf, i); |
| 1022 | int val1 = (int)floor(fbound(val*lfactor, minval, maxval)); |
| 1023 | int val2 = (int)floor(fbound(val*rfactor, minval, maxval)); |
| 1024 | SETRAWSAMPLE(width, ncp, i*2, val1); |
| 1025 | SETRAWSAMPLE(width, ncp, i*2 + width, val2); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1026 | } |
| 1027 | return rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1028 | } |
| 1029 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1030 | /*[clinic input] |
| 1031 | audioop.add |
| 1032 | |
| 1033 | fragment1: Py_buffer |
| 1034 | fragment2: Py_buffer |
| 1035 | width: int |
| 1036 | / |
| 1037 | |
| 1038 | Return a fragment which is the addition of the two samples passed as parameters. |
| 1039 | [clinic start generated code]*/ |
| 1040 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1041 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 1042 | audioop_add_impl(PyModuleDef *module, Py_buffer *fragment1, |
| 1043 | Py_buffer *fragment2, int width) |
| 1044 | /*[clinic end generated code: output=fe6c12f143e0b027 input=4a8d4bae4c1605c7]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1045 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1046 | signed char *ncp; |
| 1047 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1048 | int minval, maxval, newval; |
| 1049 | PyObject *rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1050 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1051 | if (!audioop_check_parameters(fragment1->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1052 | return NULL; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1053 | if (fragment1->len != fragment2->len) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1054 | PyErr_SetString(AudioopError, "Lengths should be the same"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1055 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1056 | } |
Guido van Rossum | 1851a67 | 1997-02-14 16:14:03 +0000 | [diff] [blame] | 1057 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1058 | maxval = maxvals[width]; |
| 1059 | minval = minvals[width]; |
Guido van Rossum | 1851a67 | 1997-02-14 16:14:03 +0000 | [diff] [blame] | 1060 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1061 | rv = PyBytes_FromStringAndSize(NULL, fragment1->len); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1062 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1063 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1064 | ncp = (signed char *)PyBytes_AsString(rv); |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1065 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1066 | for (i = 0; i < fragment1->len; i += width) { |
| 1067 | int val1 = GETRAWSAMPLE(width, fragment1->buf, i); |
| 1068 | int val2 = GETRAWSAMPLE(width, fragment2->buf, i); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1069 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1070 | if (width < 4) { |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 1071 | newval = val1 + val2; |
| 1072 | /* truncate in case of overflow */ |
| 1073 | if (newval > maxval) |
| 1074 | newval = maxval; |
| 1075 | else if (newval < minval) |
| 1076 | newval = minval; |
| 1077 | } |
| 1078 | else { |
| 1079 | double fval = (double)val1 + (double)val2; |
| 1080 | /* truncate in case of overflow */ |
| 1081 | newval = (int)floor(fbound(fval, minval, maxval)); |
| 1082 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1083 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1084 | SETRAWSAMPLE(width, ncp, i, newval); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1085 | } |
| 1086 | return rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1087 | } |
| 1088 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1089 | /*[clinic input] |
| 1090 | audioop.bias |
| 1091 | |
| 1092 | fragment: Py_buffer |
| 1093 | width: int |
| 1094 | bias: int |
| 1095 | / |
| 1096 | |
| 1097 | Return a fragment that is the original fragment with a bias added to each sample. |
| 1098 | [clinic start generated code]*/ |
| 1099 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1100 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 1101 | audioop_bias_impl(PyModuleDef *module, Py_buffer *fragment, int width, |
| 1102 | int bias) |
| 1103 | /*[clinic end generated code: output=ac1f4dda20a01c26 input=2b5cce5c3bb4838c]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1104 | { |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1105 | signed char *ncp; |
| 1106 | Py_ssize_t i; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 1107 | unsigned int val = 0, mask; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1108 | PyObject *rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1109 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1110 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1111 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1112 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1113 | rv = PyBytes_FromStringAndSize(NULL, fragment->len); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1114 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1115 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1116 | ncp = (signed char *)PyBytes_AsString(rv); |
| 1117 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1118 | mask = masks[width]; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1119 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1120 | for (i = 0; i < fragment->len; i += width) { |
| 1121 | if (width == 1) |
| 1122 | val = GETINTX(unsigned char, fragment->buf, i); |
| 1123 | else if (width == 2) |
| 1124 | val = GETINTX(unsigned short, fragment->buf, i); |
| 1125 | else if (width == 3) |
| 1126 | val = ((unsigned int)GETINT24(fragment->buf, i)) & 0xffffffu; |
Serhiy Storchaka | ce82eb2 | 2013-10-20 09:42:26 +0300 | [diff] [blame] | 1127 | else { |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1128 | assert(width == 4); |
| 1129 | val = GETINTX(PY_UINT32_T, fragment->buf, i); |
Serhiy Storchaka | ce82eb2 | 2013-10-20 09:42:26 +0300 | [diff] [blame] | 1130 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1131 | |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 1132 | val += (unsigned int)bias; |
| 1133 | /* wrap around in case of overflow */ |
| 1134 | val &= mask; |
| 1135 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1136 | if (width == 1) |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1137 | SETINTX(unsigned char, ncp, i, val); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1138 | else if (width == 2) |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1139 | SETINTX(unsigned short, ncp, i, val); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1140 | else if (width == 3) |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1141 | SETINT24(ncp, i, (int)val); |
Serhiy Storchaka | ce82eb2 | 2013-10-20 09:42:26 +0300 | [diff] [blame] | 1142 | else { |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1143 | assert(width == 4); |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1144 | SETINTX(PY_UINT32_T, ncp, i, val); |
Serhiy Storchaka | ce82eb2 | 2013-10-20 09:42:26 +0300 | [diff] [blame] | 1145 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1146 | } |
| 1147 | return rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1148 | } |
| 1149 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1150 | /*[clinic input] |
| 1151 | audioop.reverse |
| 1152 | |
| 1153 | fragment: Py_buffer |
| 1154 | width: int |
| 1155 | / |
| 1156 | |
| 1157 | Reverse the samples in a fragment and returns the modified fragment. |
| 1158 | [clinic start generated code]*/ |
| 1159 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1160 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1161 | audioop_reverse_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 1162 | /*[clinic end generated code: output=6ec3c91337f5925e input=668f890cf9f9d225]*/ |
Jack Jansen | 337b20e | 1993-02-23 13:39:57 +0000 | [diff] [blame] | 1163 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1164 | unsigned char *ncp; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1165 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1166 | PyObject *rv; |
Jack Jansen | 337b20e | 1993-02-23 13:39:57 +0000 | [diff] [blame] | 1167 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1168 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1169 | return NULL; |
Jack Jansen | 337b20e | 1993-02-23 13:39:57 +0000 | [diff] [blame] | 1170 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1171 | rv = PyBytes_FromStringAndSize(NULL, fragment->len); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1172 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1173 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1174 | ncp = (unsigned char *)PyBytes_AsString(rv); |
| 1175 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1176 | for (i = 0; i < fragment->len; i += width) { |
| 1177 | int val = GETRAWSAMPLE(width, fragment->buf, i); |
| 1178 | SETRAWSAMPLE(width, ncp, fragment->len - i - width, val); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1179 | } |
| 1180 | return rv; |
Jack Jansen | 337b20e | 1993-02-23 13:39:57 +0000 | [diff] [blame] | 1181 | } |
| 1182 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1183 | /*[clinic input] |
| 1184 | audioop.byteswap |
| 1185 | |
| 1186 | fragment: Py_buffer |
| 1187 | width: int |
| 1188 | / |
| 1189 | |
| 1190 | Convert big-endian samples to little-endian and vice versa. |
| 1191 | [clinic start generated code]*/ |
| 1192 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1193 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1194 | audioop_byteswap_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 1195 | /*[clinic end generated code: output=bfe4aa584b7a3f5b input=fae7611ceffa5c82]*/ |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1196 | { |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1197 | unsigned char *ncp; |
| 1198 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1199 | PyObject *rv; |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1200 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1201 | if (!audioop_check_parameters(fragment->len, width)) |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1202 | return NULL; |
| 1203 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1204 | rv = PyBytes_FromStringAndSize(NULL, fragment->len); |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1205 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1206 | return NULL; |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1207 | ncp = (unsigned char *)PyBytes_AsString(rv); |
| 1208 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1209 | for (i = 0; i < fragment->len; i += width) { |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1210 | int j; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1211 | for (j = 0; j < width; j++) |
| 1212 | ncp[i + width - 1 - j] = ((unsigned char *)fragment->buf)[i + j]; |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1213 | } |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1214 | return rv; |
| 1215 | } |
| 1216 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1217 | /*[clinic input] |
| 1218 | audioop.lin2lin |
| 1219 | |
| 1220 | fragment: Py_buffer |
| 1221 | width: int |
| 1222 | newwidth: int |
| 1223 | / |
| 1224 | |
| 1225 | Convert samples between 1-, 2-, 3- and 4-byte formats. |
| 1226 | [clinic start generated code]*/ |
| 1227 | |
Serhiy Storchaka | 3062c9a | 2013-11-23 22:26:01 +0200 | [diff] [blame] | 1228 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 1229 | audioop_lin2lin_impl(PyModuleDef *module, Py_buffer *fragment, int width, |
| 1230 | int newwidth) |
| 1231 | /*[clinic end generated code: output=cb6ca950d1df9898 input=5ce08c8aa2f24d96]*/ |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 1232 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1233 | unsigned char *ncp; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1234 | Py_ssize_t i, j; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1235 | PyObject *rv; |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 1236 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1237 | if (!audioop_check_parameters(fragment->len, width)) |
| 1238 | return NULL; |
| 1239 | if (!audioop_check_size(newwidth)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1240 | return NULL; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1241 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1242 | if (fragment->len/width > PY_SSIZE_T_MAX/newwidth) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1243 | PyErr_SetString(PyExc_MemoryError, |
| 1244 | "not enough memory for output buffer"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1245 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1246 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1247 | rv = PyBytes_FromStringAndSize(NULL, (fragment->len/width)*newwidth); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1248 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1249 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1250 | ncp = (unsigned char *)PyBytes_AsString(rv); |
| 1251 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1252 | for (i = j = 0; i < fragment->len; i += width, j += newwidth) { |
| 1253 | int val = GETSAMPLE32(width, fragment->buf, i); |
| 1254 | SETSAMPLE32(newwidth, ncp, j, val); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1255 | } |
| 1256 | return rv; |
Jack Jansen | a90805f | 1993-02-17 14:29:28 +0000 | [diff] [blame] | 1257 | } |
| 1258 | |
Guido van Rossum | b24c9ea | 1997-05-20 15:59:35 +0000 | [diff] [blame] | 1259 | static int |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 1260 | gcd(int a, int b) |
Guido van Rossum | b24c9ea | 1997-05-20 15:59:35 +0000 | [diff] [blame] | 1261 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1262 | while (b > 0) { |
| 1263 | int tmp = a % b; |
| 1264 | a = b; |
| 1265 | b = tmp; |
| 1266 | } |
| 1267 | return a; |
Guido van Rossum | b24c9ea | 1997-05-20 15:59:35 +0000 | [diff] [blame] | 1268 | } |
| 1269 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1270 | /*[clinic input] |
| 1271 | audioop.ratecv |
| 1272 | |
| 1273 | fragment: Py_buffer |
| 1274 | width: int |
| 1275 | nchannels: int |
| 1276 | inrate: int |
| 1277 | outrate: int |
| 1278 | state: object |
| 1279 | weightA: int = 1 |
| 1280 | weightB: int = 0 |
| 1281 | / |
| 1282 | |
| 1283 | Convert the frame rate of the input fragment. |
| 1284 | [clinic start generated code]*/ |
| 1285 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1286 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 1287 | audioop_ratecv_impl(PyModuleDef *module, Py_buffer *fragment, int width, |
| 1288 | int nchannels, int inrate, int outrate, PyObject *state, |
| 1289 | int weightA, int weightB) |
| 1290 | /*[clinic end generated code: output=59e1787bfa49b9d9 input=aff3acdc94476191]*/ |
Roger E. Masse | c905fff | 1997-01-17 18:12:04 +0000 | [diff] [blame] | 1291 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1292 | char *cp, *ncp; |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 1293 | Py_ssize_t len; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1294 | int chan, d, *prev_i, *cur_i, cur_o; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1295 | PyObject *samps, *str, *rv = NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1296 | int bytes_per_frame; |
Guido van Rossum | 1851a67 | 1997-02-14 16:14:03 +0000 | [diff] [blame] | 1297 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1298 | if (!audioop_check_size(width)) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1299 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1300 | if (nchannels < 1) { |
| 1301 | PyErr_SetString(AudioopError, "# of channels should be >= 1"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1302 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1303 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1304 | if (width > INT_MAX / nchannels) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1305 | /* This overflow test is rigorously correct because |
| 1306 | both multiplicands are >= 1. Use the argument names |
| 1307 | from the docs for the error msg. */ |
| 1308 | PyErr_SetString(PyExc_OverflowError, |
| 1309 | "width * nchannels too big for a C int"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1310 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1311 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1312 | bytes_per_frame = width * nchannels; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1313 | if (weightA < 1 || weightB < 0) { |
| 1314 | PyErr_SetString(AudioopError, |
| 1315 | "weightA should be >= 1, weightB should be >= 0"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1316 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1317 | } |
Christian Heimes | c4ab9a4 | 2014-01-27 01:12:00 +0100 | [diff] [blame] | 1318 | assert(fragment->len >= 0); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1319 | if (fragment->len % bytes_per_frame != 0) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1320 | PyErr_SetString(AudioopError, "not a whole number of frames"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1321 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1322 | } |
| 1323 | if (inrate <= 0 || outrate <= 0) { |
| 1324 | PyErr_SetString(AudioopError, "sampling rate not > 0"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1325 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1326 | } |
| 1327 | /* divide inrate and outrate by their greatest common divisor */ |
| 1328 | d = gcd(inrate, outrate); |
| 1329 | inrate /= d; |
| 1330 | outrate /= d; |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 1331 | /* divide weightA and weightB by their greatest common divisor */ |
| 1332 | d = gcd(weightA, weightB); |
| 1333 | weightA /= d; |
Serhiy Storchaka | 50451eb | 2015-05-30 00:53:26 +0300 | [diff] [blame] | 1334 | weightB /= d; |
Guido van Rossum | b24c9ea | 1997-05-20 15:59:35 +0000 | [diff] [blame] | 1335 | |
Mark Dickinson | 85eacea | 2010-05-10 16:27:45 +0000 | [diff] [blame] | 1336 | if ((size_t)nchannels > PY_SIZE_MAX/sizeof(int)) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1337 | PyErr_SetString(PyExc_MemoryError, |
| 1338 | "not enough memory for output buffer"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1339 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1340 | } |
Victor Stinner | b640491 | 2013-07-07 16:21:41 +0200 | [diff] [blame] | 1341 | prev_i = (int *) PyMem_Malloc(nchannels * sizeof(int)); |
| 1342 | cur_i = (int *) PyMem_Malloc(nchannels * sizeof(int)); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1343 | if (prev_i == NULL || cur_i == NULL) { |
| 1344 | (void) PyErr_NoMemory(); |
| 1345 | goto exit; |
| 1346 | } |
| 1347 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1348 | len = fragment->len / bytes_per_frame; /* # of frames */ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1349 | |
| 1350 | if (state == Py_None) { |
| 1351 | d = -outrate; |
| 1352 | for (chan = 0; chan < nchannels; chan++) |
| 1353 | prev_i[chan] = cur_i[chan] = 0; |
| 1354 | } |
| 1355 | else { |
| 1356 | if (!PyArg_ParseTuple(state, |
| 1357 | "iO!;audioop.ratecv: illegal state argument", |
| 1358 | &d, &PyTuple_Type, &samps)) |
| 1359 | goto exit; |
| 1360 | if (PyTuple_Size(samps) != nchannels) { |
| 1361 | PyErr_SetString(AudioopError, |
| 1362 | "illegal state argument"); |
| 1363 | goto exit; |
Amaury Forgeot d'Arc | 9c74b14 | 2008-06-18 00:47:36 +0000 | [diff] [blame] | 1364 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1365 | for (chan = 0; chan < nchannels; chan++) { |
| 1366 | if (!PyArg_ParseTuple(PyTuple_GetItem(samps, chan), |
| 1367 | "ii:ratecv", &prev_i[chan], |
| 1368 | &cur_i[chan])) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1369 | goto exit; |
| 1370 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1371 | } |
Guido van Rossum | 1851a67 | 1997-02-14 16:14:03 +0000 | [diff] [blame] | 1372 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1373 | /* str <- Space for the output buffer. */ |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 1374 | if (len == 0) |
| 1375 | str = PyBytes_FromStringAndSize(NULL, 0); |
| 1376 | else { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1377 | /* There are len input frames, so we need (mathematically) |
| 1378 | ceiling(len*outrate/inrate) output frames, and each frame |
| 1379 | requires bytes_per_frame bytes. Computing this |
| 1380 | without spurious overflow is the challenge; we can |
Mark Dickinson | 393b97a | 2010-05-11 13:09:58 +0000 | [diff] [blame] | 1381 | settle for a reasonable upper bound, though, in this |
| 1382 | case ceiling(len/inrate) * outrate. */ |
| 1383 | |
| 1384 | /* compute ceiling(len/inrate) without overflow */ |
Christian Heimes | c4ab9a4 | 2014-01-27 01:12:00 +0100 | [diff] [blame] | 1385 | Py_ssize_t q = 1 + (len - 1) / inrate; |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 1386 | if (outrate > PY_SSIZE_T_MAX / q / bytes_per_frame) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1387 | str = NULL; |
| 1388 | else |
Mark Dickinson | 393b97a | 2010-05-11 13:09:58 +0000 | [diff] [blame] | 1389 | str = PyBytes_FromStringAndSize(NULL, |
| 1390 | q * outrate * bytes_per_frame); |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 1391 | } |
| 1392 | if (str == NULL) { |
| 1393 | PyErr_SetString(PyExc_MemoryError, |
| 1394 | "not enough memory for output buffer"); |
| 1395 | goto exit; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1396 | } |
| 1397 | ncp = PyBytes_AsString(str); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1398 | cp = fragment->buf; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1399 | |
| 1400 | for (;;) { |
| 1401 | while (d < 0) { |
| 1402 | if (len == 0) { |
| 1403 | samps = PyTuple_New(nchannels); |
| 1404 | if (samps == NULL) |
| 1405 | goto exit; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1406 | for (chan = 0; chan < nchannels; chan++) |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1407 | PyTuple_SetItem(samps, chan, |
| 1408 | Py_BuildValue("(ii)", |
| 1409 | prev_i[chan], |
| 1410 | cur_i[chan])); |
| 1411 | if (PyErr_Occurred()) |
| 1412 | goto exit; |
| 1413 | /* We have checked before that the length |
| 1414 | * of the string fits into int. */ |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 1415 | len = (Py_ssize_t)(ncp - PyBytes_AsString(str)); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1416 | rv = PyBytes_FromStringAndSize |
| 1417 | (PyBytes_AsString(str), len); |
| 1418 | Py_DECREF(str); |
| 1419 | str = rv; |
| 1420 | if (str == NULL) |
| 1421 | goto exit; |
| 1422 | rv = Py_BuildValue("(O(iO))", str, d, samps); |
| 1423 | Py_DECREF(samps); |
| 1424 | Py_DECREF(str); |
| 1425 | goto exit; /* return rv */ |
| 1426 | } |
| 1427 | for (chan = 0; chan < nchannels; chan++) { |
| 1428 | prev_i[chan] = cur_i[chan]; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1429 | cur_i[chan] = GETSAMPLE32(width, cp, 0); |
| 1430 | cp += width; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1431 | /* implements a simple digital filter */ |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 1432 | cur_i[chan] = (int)( |
| 1433 | ((double)weightA * (double)cur_i[chan] + |
| 1434 | (double)weightB * (double)prev_i[chan]) / |
| 1435 | ((double)weightA + (double)weightB)); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1436 | } |
| 1437 | len--; |
| 1438 | d += outrate; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1439 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1440 | while (d >= 0) { |
| 1441 | for (chan = 0; chan < nchannels; chan++) { |
Serhiy Storchaka | 01ad622 | 2013-02-09 11:10:53 +0200 | [diff] [blame] | 1442 | cur_o = (int)(((double)prev_i[chan] * (double)d + |
| 1443 | (double)cur_i[chan] * (double)(outrate - d)) / |
| 1444 | (double)outrate); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1445 | SETSAMPLE32(width, ncp, 0, cur_o); |
| 1446 | ncp += width; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1447 | } |
| 1448 | d -= inrate; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1449 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1450 | } |
Guido van Rossum | 65bb328 | 1999-09-07 14:24:05 +0000 | [diff] [blame] | 1451 | exit: |
Victor Stinner | b640491 | 2013-07-07 16:21:41 +0200 | [diff] [blame] | 1452 | PyMem_Free(prev_i); |
| 1453 | PyMem_Free(cur_i); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1454 | return rv; |
Roger E. Masse | c905fff | 1997-01-17 18:12:04 +0000 | [diff] [blame] | 1455 | } |
Guido van Rossum | 1851a67 | 1997-02-14 16:14:03 +0000 | [diff] [blame] | 1456 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1457 | /*[clinic input] |
| 1458 | audioop.lin2ulaw |
| 1459 | |
| 1460 | fragment: Py_buffer |
| 1461 | width: int |
| 1462 | / |
| 1463 | |
| 1464 | Convert samples in the audio fragment to u-LAW encoding. |
| 1465 | [clinic start generated code]*/ |
| 1466 | |
Roger E. Masse | c905fff | 1997-01-17 18:12:04 +0000 | [diff] [blame] | 1467 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1468 | audioop_lin2ulaw_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 1469 | /*[clinic end generated code: output=26263cc877c5e1bc input=2450d1b870b6bac2]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1470 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1471 | unsigned char *ncp; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1472 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1473 | PyObject *rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1474 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1475 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1476 | return NULL; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1477 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1478 | rv = PyBytes_FromStringAndSize(NULL, fragment->len/width); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1479 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1480 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1481 | ncp = (unsigned char *)PyBytes_AsString(rv); |
| 1482 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1483 | for (i = 0; i < fragment->len; i += width) { |
| 1484 | int val = GETSAMPLE32(width, fragment->buf, i); |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1485 | *ncp++ = st_14linear2ulaw(val >> 18); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1486 | } |
| 1487 | return rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1488 | } |
| 1489 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1490 | /*[clinic input] |
| 1491 | audioop.ulaw2lin |
| 1492 | |
| 1493 | fragment: Py_buffer |
| 1494 | width: int |
| 1495 | / |
| 1496 | |
| 1497 | Convert sound fragments in u-LAW encoding to linearly encoded sound fragments. |
| 1498 | [clinic start generated code]*/ |
| 1499 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1500 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1501 | audioop_ulaw2lin_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 1502 | /*[clinic end generated code: output=9864cb34e3a1d876 input=45d53ddce5be7d06]*/ |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1503 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1504 | unsigned char *cp; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1505 | signed char *ncp; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1506 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1507 | PyObject *rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1508 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1509 | if (!audioop_check_size(width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1510 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1511 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1512 | if (fragment->len > PY_SSIZE_T_MAX/width) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1513 | PyErr_SetString(PyExc_MemoryError, |
| 1514 | "not enough memory for output buffer"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1515 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1516 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1517 | rv = PyBytes_FromStringAndSize(NULL, fragment->len*width); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1518 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1519 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1520 | ncp = (signed char *)PyBytes_AsString(rv); |
| 1521 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1522 | cp = fragment->buf; |
| 1523 | for (i = 0; i < fragment->len*width; i += width) { |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1524 | int val = st_ulaw2linear16(*cp++) << 16; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1525 | SETSAMPLE32(width, ncp, i, val); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1526 | } |
| 1527 | return rv; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1528 | } |
| 1529 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1530 | /*[clinic input] |
| 1531 | audioop.lin2alaw |
| 1532 | |
| 1533 | fragment: Py_buffer |
| 1534 | width: int |
| 1535 | / |
| 1536 | |
| 1537 | Convert samples in the audio fragment to a-LAW encoding. |
| 1538 | [clinic start generated code]*/ |
| 1539 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1540 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1541 | audioop_lin2alaw_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 1542 | /*[clinic end generated code: output=d5bf14bd0fe6fdcd input=ffb1ef8bb39da945]*/ |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1543 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1544 | unsigned char *ncp; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1545 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1546 | PyObject *rv; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1547 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1548 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1549 | return NULL; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1550 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1551 | rv = PyBytes_FromStringAndSize(NULL, fragment->len/width); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1552 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1553 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1554 | ncp = (unsigned char *)PyBytes_AsString(rv); |
| 1555 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1556 | for (i = 0; i < fragment->len; i += width) { |
| 1557 | int val = GETSAMPLE32(width, fragment->buf, i); |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1558 | *ncp++ = st_linear2alaw(val >> 19); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1559 | } |
| 1560 | return rv; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1561 | } |
| 1562 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1563 | /*[clinic input] |
| 1564 | audioop.alaw2lin |
| 1565 | |
| 1566 | fragment: Py_buffer |
| 1567 | width: int |
| 1568 | / |
| 1569 | |
| 1570 | Convert sound fragments in a-LAW encoding to linearly encoded sound fragments. |
| 1571 | [clinic start generated code]*/ |
| 1572 | |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1573 | static PyObject * |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1574 | audioop_alaw2lin_impl(PyModuleDef *module, Py_buffer *fragment, int width) |
Larry Hastings | 581ee36 | 2014-01-28 05:00:08 -0800 | [diff] [blame] | 1575 | /*[clinic end generated code: output=d2b604ddd036e1cd input=4140626046cd1772]*/ |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1576 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1577 | unsigned char *cp; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1578 | signed char *ncp; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1579 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1580 | int val; |
| 1581 | PyObject *rv; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1582 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1583 | if (!audioop_check_size(width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1584 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1585 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1586 | if (fragment->len > PY_SSIZE_T_MAX/width) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1587 | PyErr_SetString(PyExc_MemoryError, |
| 1588 | "not enough memory for output buffer"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1589 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1590 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1591 | rv = PyBytes_FromStringAndSize(NULL, fragment->len*width); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1592 | if (rv == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1593 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1594 | ncp = (signed char *)PyBytes_AsString(rv); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1595 | cp = fragment->buf; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1596 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1597 | for (i = 0; i < fragment->len*width; i += width) { |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1598 | val = st_alaw2linear16(*cp++) << 16; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1599 | SETSAMPLE32(width, ncp, i, val); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1600 | } |
| 1601 | return rv; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1602 | } |
| 1603 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1604 | /*[clinic input] |
| 1605 | audioop.lin2adpcm |
| 1606 | |
| 1607 | fragment: Py_buffer |
| 1608 | width: int |
| 1609 | state: object |
| 1610 | / |
| 1611 | |
| 1612 | Convert samples to 4 bit Intel/DVI ADPCM encoding. |
| 1613 | [clinic start generated code]*/ |
| 1614 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1615 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 1616 | audioop_lin2adpcm_impl(PyModuleDef *module, Py_buffer *fragment, int width, |
| 1617 | PyObject *state) |
| 1618 | /*[clinic end generated code: output=93f0996f592b5ce5 input=12919d549b90c90a]*/ |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1619 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1620 | signed char *ncp; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1621 | Py_ssize_t i; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1622 | int step, valpred, delta, |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1623 | index, sign, vpdiff, diff; |
Benjamin Peterson | 08673c5 | 2014-01-26 10:24:24 -0500 | [diff] [blame] | 1624 | PyObject *rv = NULL, *str; |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 1625 | int outputbuffer = 0, bufferstep; |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1626 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1627 | if (!audioop_check_parameters(fragment->len, width)) |
Victor Stinner | bc5c54b | 2010-07-03 13:44:22 +0000 | [diff] [blame] | 1628 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1629 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1630 | /* Decode state, should have (value, step) */ |
| 1631 | if ( state == Py_None ) { |
| 1632 | /* First time, it seems. Set defaults */ |
| 1633 | valpred = 0; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1634 | index = 0; |
Benjamin Peterson | 08673c5 | 2014-01-26 10:24:24 -0500 | [diff] [blame] | 1635 | } |
Serhiy Storchaka | 449e2be | 2015-06-28 17:52:09 +0300 | [diff] [blame] | 1636 | else if (!PyTuple_Check(state)) { |
| 1637 | PyErr_SetString(PyExc_TypeError, "state must be a tuple or None"); |
| 1638 | return NULL; |
| 1639 | } |
| 1640 | else if (!PyArg_ParseTuple(state, "ii", &valpred, &index)) { |
| 1641 | return NULL; |
| 1642 | } |
| 1643 | else if (valpred >= 0x8000 || valpred < -0x8000 || |
| 1644 | (size_t)index >= Py_ARRAY_LENGTH(stepsizeTable)) { |
| 1645 | PyErr_SetString(PyExc_ValueError, "bad state"); |
| 1646 | return NULL; |
| 1647 | } |
| 1648 | |
| 1649 | str = PyBytes_FromStringAndSize(NULL, fragment->len/(width*2)); |
| 1650 | if (str == NULL) |
| 1651 | return NULL; |
| 1652 | ncp = (signed char *)PyBytes_AsString(str); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1653 | |
| 1654 | step = stepsizeTable[index]; |
| 1655 | bufferstep = 1; |
| 1656 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1657 | for (i = 0; i < fragment->len; i += width) { |
| 1658 | int val = GETSAMPLE32(width, fragment->buf, i) >> 16; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1659 | |
| 1660 | /* Step 1 - compute difference with previous value */ |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1661 | if (val < valpred) { |
| 1662 | diff = valpred - val; |
| 1663 | sign = 8; |
| 1664 | } |
| 1665 | else { |
| 1666 | diff = val - valpred; |
| 1667 | sign = 0; |
| 1668 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1669 | |
| 1670 | /* Step 2 - Divide and clamp */ |
| 1671 | /* Note: |
| 1672 | ** This code *approximately* computes: |
| 1673 | ** delta = diff*4/step; |
| 1674 | ** vpdiff = (delta+0.5)*step/4; |
| 1675 | ** but in shift step bits are dropped. The net result of this |
| 1676 | ** is that even if you have fast mul/div hardware you cannot |
| 1677 | ** put it to good use since the fixup would be too expensive. |
| 1678 | */ |
| 1679 | delta = 0; |
| 1680 | vpdiff = (step >> 3); |
| 1681 | |
| 1682 | if ( diff >= step ) { |
| 1683 | delta = 4; |
| 1684 | diff -= step; |
| 1685 | vpdiff += step; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1686 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1687 | step >>= 1; |
| 1688 | if ( diff >= step ) { |
| 1689 | delta |= 2; |
| 1690 | diff -= step; |
| 1691 | vpdiff += step; |
| 1692 | } |
| 1693 | step >>= 1; |
| 1694 | if ( diff >= step ) { |
| 1695 | delta |= 1; |
| 1696 | vpdiff += step; |
| 1697 | } |
Jack Jansen | dd8a6ea | 1993-02-17 14:21:09 +0000 | [diff] [blame] | 1698 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1699 | /* Step 3 - Update previous value */ |
| 1700 | if ( sign ) |
| 1701 | valpred -= vpdiff; |
| 1702 | else |
| 1703 | valpred += vpdiff; |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1704 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1705 | /* Step 4 - Clamp previous value to 16 bits */ |
| 1706 | if ( valpred > 32767 ) |
| 1707 | valpred = 32767; |
| 1708 | else if ( valpred < -32768 ) |
| 1709 | valpred = -32768; |
| 1710 | |
| 1711 | /* Step 5 - Assemble value, update index and step values */ |
| 1712 | delta |= sign; |
| 1713 | |
| 1714 | index += indexTable[delta]; |
| 1715 | if ( index < 0 ) index = 0; |
| 1716 | if ( index > 88 ) index = 88; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1717 | step = stepsizeTable[index]; |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1718 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1719 | /* Step 6 - Output value */ |
| 1720 | if ( bufferstep ) { |
| 1721 | outputbuffer = (delta << 4) & 0xf0; |
| 1722 | } else { |
| 1723 | *ncp++ = (delta & 0x0f) | outputbuffer; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1724 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1725 | bufferstep = !bufferstep; |
| 1726 | } |
| 1727 | rv = Py_BuildValue("(O(ii))", str, valpred, index); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1728 | Py_DECREF(str); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1729 | return rv; |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1730 | } |
| 1731 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1732 | /*[clinic input] |
| 1733 | audioop.adpcm2lin |
| 1734 | |
| 1735 | fragment: Py_buffer |
| 1736 | width: int |
| 1737 | state: object |
| 1738 | / |
| 1739 | |
| 1740 | Decode an Intel/DVI ADPCM coded fragment to a linear fragment. |
| 1741 | [clinic start generated code]*/ |
| 1742 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1743 | static PyObject * |
Larry Hastings | 89964c4 | 2015-04-14 18:07:59 -0400 | [diff] [blame] | 1744 | audioop_adpcm2lin_impl(PyModuleDef *module, Py_buffer *fragment, int width, |
| 1745 | PyObject *state) |
| 1746 | /*[clinic end generated code: output=236cf6dc2c829181 input=f5221144f5ca9ef0]*/ |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1747 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1748 | signed char *cp; |
| 1749 | signed char *ncp; |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1750 | Py_ssize_t i, outlen; |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1751 | int valpred, step, delta, index, sign, vpdiff; |
| 1752 | PyObject *rv, *str; |
Mark Dickinson | 81fece2 | 2010-05-11 13:34:35 +0000 | [diff] [blame] | 1753 | int inputbuffer = 0, bufferstep; |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1754 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1755 | if (!audioop_check_size(width)) |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1756 | return NULL; |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1757 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1758 | /* Decode state, should have (value, step) */ |
| 1759 | if ( state == Py_None ) { |
| 1760 | /* First time, it seems. Set defaults */ |
| 1761 | valpred = 0; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1762 | index = 0; |
Serhiy Storchaka | 449e2be | 2015-06-28 17:52:09 +0300 | [diff] [blame] | 1763 | } |
| 1764 | else if (!PyTuple_Check(state)) { |
Victor Stinner | daeffd2 | 2014-01-03 03:26:47 +0100 | [diff] [blame] | 1765 | PyErr_SetString(PyExc_TypeError, "state must be a tuple or None"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1766 | return NULL; |
Serhiy Storchaka | 449e2be | 2015-06-28 17:52:09 +0300 | [diff] [blame] | 1767 | } |
| 1768 | else if (!PyArg_ParseTuple(state, "ii", &valpred, &index)) { |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1769 | return NULL; |
Serhiy Storchaka | 449e2be | 2015-06-28 17:52:09 +0300 | [diff] [blame] | 1770 | } |
| 1771 | else if (valpred >= 0x8000 || valpred < -0x8000 || |
| 1772 | (size_t)index >= Py_ARRAY_LENGTH(stepsizeTable)) { |
| 1773 | PyErr_SetString(PyExc_ValueError, "bad state"); |
| 1774 | return NULL; |
| 1775 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1776 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1777 | if (fragment->len > (PY_SSIZE_T_MAX/2)/width) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1778 | PyErr_SetString(PyExc_MemoryError, |
| 1779 | "not enough memory for output buffer"); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1780 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1781 | } |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1782 | outlen = fragment->len*width*2; |
Serhiy Storchaka | eaea5e9 | 2013-10-19 21:10:46 +0300 | [diff] [blame] | 1783 | str = PyBytes_FromStringAndSize(NULL, outlen); |
Serhiy Storchaka | 711e91b | 2013-11-10 21:44:36 +0200 | [diff] [blame] | 1784 | if (str == NULL) |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1785 | return NULL; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1786 | ncp = (signed char *)PyBytes_AsString(str); |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1787 | cp = fragment->buf; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1788 | |
| 1789 | step = stepsizeTable[index]; |
| 1790 | bufferstep = 0; |
| 1791 | |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1792 | for (i = 0; i < outlen; i += width) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1793 | /* Step 1 - get the delta value and compute next index */ |
| 1794 | if ( bufferstep ) { |
| 1795 | delta = inputbuffer & 0xf; |
| 1796 | } else { |
| 1797 | inputbuffer = *cp++; |
| 1798 | delta = (inputbuffer >> 4) & 0xf; |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1799 | } |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1800 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1801 | bufferstep = !bufferstep; |
| 1802 | |
| 1803 | /* Step 2 - Find new index value (for later) */ |
| 1804 | index += indexTable[delta]; |
| 1805 | if ( index < 0 ) index = 0; |
| 1806 | if ( index > 88 ) index = 88; |
| 1807 | |
| 1808 | /* Step 3 - Separate sign and magnitude */ |
| 1809 | sign = delta & 8; |
| 1810 | delta = delta & 7; |
| 1811 | |
| 1812 | /* Step 4 - Compute difference and new predicted value */ |
| 1813 | /* |
| 1814 | ** Computes 'vpdiff = (delta+0.5)*step/4', but see comment |
| 1815 | ** in adpcm_coder. |
| 1816 | */ |
| 1817 | vpdiff = step >> 3; |
| 1818 | if ( delta & 4 ) vpdiff += step; |
| 1819 | if ( delta & 2 ) vpdiff += step>>1; |
| 1820 | if ( delta & 1 ) vpdiff += step>>2; |
| 1821 | |
| 1822 | if ( sign ) |
| 1823 | valpred -= vpdiff; |
| 1824 | else |
| 1825 | valpred += vpdiff; |
| 1826 | |
| 1827 | /* Step 5 - clamp output value */ |
| 1828 | if ( valpred > 32767 ) |
| 1829 | valpred = 32767; |
| 1830 | else if ( valpred < -32768 ) |
| 1831 | valpred = -32768; |
| 1832 | |
| 1833 | /* Step 6 - Update step value */ |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 1834 | step = stepsizeTable[index]; |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1835 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1836 | /* Step 6 - Output value */ |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1837 | SETSAMPLE32(width, ncp, i, valpred << 16); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1838 | } |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1839 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1840 | rv = Py_BuildValue("(O(ii))", str, valpred, index); |
| 1841 | Py_DECREF(str); |
| 1842 | return rv; |
Guido van Rossum | b64e635 | 1992-07-06 14:21:56 +0000 | [diff] [blame] | 1843 | } |
| 1844 | |
Larry Hastings | f256c22 | 2014-01-25 21:30:37 -0800 | [diff] [blame] | 1845 | #include "clinic/audioop.c.h" |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1846 | |
Roger E. Masse | eaa6e11 | 1997-01-03 19:26:27 +0000 | [diff] [blame] | 1847 | static PyMethodDef audioop_methods[] = { |
Serhiy Storchaka | 8d00d73 | 2014-01-25 11:57:59 +0200 | [diff] [blame] | 1848 | AUDIOOP_MAX_METHODDEF |
| 1849 | AUDIOOP_MINMAX_METHODDEF |
| 1850 | AUDIOOP_AVG_METHODDEF |
| 1851 | AUDIOOP_MAXPP_METHODDEF |
| 1852 | AUDIOOP_AVGPP_METHODDEF |
| 1853 | AUDIOOP_RMS_METHODDEF |
| 1854 | AUDIOOP_FINDFIT_METHODDEF |
| 1855 | AUDIOOP_FINDMAX_METHODDEF |
| 1856 | AUDIOOP_FINDFACTOR_METHODDEF |
| 1857 | AUDIOOP_CROSS_METHODDEF |
| 1858 | AUDIOOP_MUL_METHODDEF |
| 1859 | AUDIOOP_ADD_METHODDEF |
| 1860 | AUDIOOP_BIAS_METHODDEF |
| 1861 | AUDIOOP_ULAW2LIN_METHODDEF |
| 1862 | AUDIOOP_LIN2ULAW_METHODDEF |
| 1863 | AUDIOOP_ALAW2LIN_METHODDEF |
| 1864 | AUDIOOP_LIN2ALAW_METHODDEF |
| 1865 | AUDIOOP_LIN2LIN_METHODDEF |
| 1866 | AUDIOOP_ADPCM2LIN_METHODDEF |
| 1867 | AUDIOOP_LIN2ADPCM_METHODDEF |
| 1868 | AUDIOOP_TOMONO_METHODDEF |
| 1869 | AUDIOOP_TOSTEREO_METHODDEF |
| 1870 | AUDIOOP_GETSAMPLE_METHODDEF |
| 1871 | AUDIOOP_REVERSE_METHODDEF |
| 1872 | AUDIOOP_BYTESWAP_METHODDEF |
| 1873 | AUDIOOP_RATECV_METHODDEF |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1874 | { 0, 0 } |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1875 | }; |
| 1876 | |
Martin v. Löwis | 1a21451 | 2008-06-11 05:26:20 +0000 | [diff] [blame] | 1877 | |
| 1878 | static struct PyModuleDef audioopmodule = { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1879 | PyModuleDef_HEAD_INIT, |
| 1880 | "audioop", |
| 1881 | NULL, |
| 1882 | -1, |
| 1883 | audioop_methods, |
| 1884 | NULL, |
| 1885 | NULL, |
| 1886 | NULL, |
| 1887 | NULL |
Martin v. Löwis | 1a21451 | 2008-06-11 05:26:20 +0000 | [diff] [blame] | 1888 | }; |
| 1889 | |
Mark Hammond | fe51c6d | 2002-08-02 02:27:13 +0000 | [diff] [blame] | 1890 | PyMODINIT_FUNC |
Martin v. Löwis | 1a21451 | 2008-06-11 05:26:20 +0000 | [diff] [blame] | 1891 | PyInit_audioop(void) |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1892 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 1893 | PyObject *m, *d; |
| 1894 | m = PyModule_Create(&audioopmodule); |
| 1895 | if (m == NULL) |
| 1896 | return NULL; |
| 1897 | d = PyModule_GetDict(m); |
| 1898 | if (d == NULL) |
| 1899 | return NULL; |
| 1900 | AudioopError = PyErr_NewException("audioop.error", NULL, NULL); |
| 1901 | if (AudioopError != NULL) |
| 1902 | PyDict_SetItemString(d,"error",AudioopError); |
| 1903 | return m; |
Guido van Rossum | b66efa0 | 1992-06-01 16:01:24 +0000 | [diff] [blame] | 1904 | } |