Josh Coalson | 26560dd | 2001-02-08 00:38:41 +0000 | [diff] [blame] | 1 | /* libFLAC - Free Lossless Audio Codec library |
Josh Coalson | 70118f6 | 2001-01-16 20:17:53 +0000 | [diff] [blame] | 2 | * Copyright (C) 2000,2001 Josh Coalson |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Library General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Library General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Library General Public |
| 15 | * License along with this library; if not, write to the |
| 16 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 17 | * Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #include <assert.h> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> /* for malloc() */ |
| 23 | #include <string.h> /* for memcpy() */ |
| 24 | #include "FLAC/encoder.h" |
| 25 | #include "private/bitbuffer.h" |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame^] | 26 | #include "private/crc.h" |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 27 | #include "private/encoder_framing.h" |
| 28 | #include "private/fixed.h" |
| 29 | #include "private/lpc.h" |
Josh Coalson | fa37f1c | 2001-01-12 23:55:11 +0000 | [diff] [blame] | 30 | #include "private/md5.h" |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 31 | |
| 32 | #ifdef min |
| 33 | #undef min |
| 34 | #endif |
| 35 | #define min(x,y) ((x)<(y)?(x):(y)) |
| 36 | |
| 37 | #ifdef max |
| 38 | #undef max |
| 39 | #endif |
| 40 | #define max(x,y) ((x)>(y)?(x):(y)) |
| 41 | |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 42 | typedef struct FLAC__EncoderPrivate { |
| 43 | unsigned input_capacity; /* current size (in samples) of the signal and residual buffers */ |
| 44 | int32 *integer_signal[FLAC__MAX_CHANNELS]; /* the integer version of the input signal */ |
| 45 | int32 *integer_signal_mid_side[2]; /* the integer version of the mid-side input signal (stereo only) */ |
| 46 | real *real_signal[FLAC__MAX_CHANNELS]; /* the floating-point version of the input signal */ |
| 47 | real *real_signal_mid_side[2]; /* the floating-point version of the mid-side input signal (stereo only) */ |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 48 | int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */ |
| 49 | int32 *residual_workspace_mid_side[2][2]; |
| 50 | FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2]; |
| 51 | FLAC__Subframe subframe_workspace_mid_side[2][2]; |
| 52 | FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2]; |
| 53 | FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2]; |
| 54 | unsigned best_subframe[FLAC__MAX_CHANNELS]; /* index into the above workspaces */ |
| 55 | unsigned best_subframe_mid_side[2]; |
| 56 | unsigned best_subframe_bits[FLAC__MAX_CHANNELS]; /* size in bits of the best subframe for each channel */ |
| 57 | unsigned best_subframe_bits_mid_side[2]; |
Josh Coalson | e77287e | 2001-01-20 01:27:55 +0000 | [diff] [blame] | 58 | uint32 *abs_residual; /* workspace where the abs(candidate residual) is stored */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 59 | FLAC__BitBuffer frame; /* the current frame being worked on */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 60 | bool current_frame_can_do_mid_side; /* encoder sets this false when any given sample of a frame's side channel exceeds 16 bits */ |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 61 | double loose_mid_side_stereo_frames_exact; /* exact number of frames the encoder will use before trying both independent and mid/side frames again */ |
| 62 | unsigned loose_mid_side_stereo_frames; /* rounded number of frames the encoder will use before trying both independent and mid/side frames again */ |
| 63 | unsigned loose_mid_side_stereo_frame_count; /* number of frames using the current channel assignment */ |
| 64 | FLAC__ChannelAssignment last_channel_assignment; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 65 | FLAC__StreamMetaData metadata; |
| 66 | unsigned current_sample_number; |
| 67 | unsigned current_frame_number; |
Josh Coalson | fa37f1c | 2001-01-12 23:55:11 +0000 | [diff] [blame] | 68 | struct MD5Context md5context; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 69 | FLAC__EncoderWriteStatus (*write_callback)(const FLAC__Encoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data); |
| 70 | void (*metadata_callback)(const FLAC__Encoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data); |
| 71 | void *client_data; |
| 72 | } FLAC__EncoderPrivate; |
| 73 | |
| 74 | static bool encoder_resize_buffers_(FLAC__Encoder *encoder, unsigned new_size); |
| 75 | static bool encoder_process_frame_(FLAC__Encoder *encoder, bool is_last_frame); |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 76 | static bool encoder_process_subframes_(FLAC__Encoder *encoder, bool is_last_frame); |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 77 | static bool encoder_process_subframe_(FLAC__Encoder *encoder, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned bits_per_sample, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits); |
| 78 | static bool encoder_add_subframe_(FLAC__Encoder *encoder, const FLAC__FrameHeader *frame_header, unsigned bits_per_sample, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame); |
Josh Coalson | 6dcea51 | 2001-01-23 23:07:36 +0000 | [diff] [blame] | 79 | static unsigned encoder_evaluate_constant_subframe_(const int32 signal, unsigned bits_per_sample, FLAC__Subframe *subframe); |
| 80 | static unsigned encoder_evaluate_fixed_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], unsigned blocksize, unsigned bits_per_sample, unsigned order, unsigned rice_parameter, unsigned max_partition_order, FLAC__Subframe *subframe); |
| 81 | static unsigned encoder_evaluate_lpc_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], const real lp_coeff[], unsigned blocksize, unsigned bits_per_sample, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned max_partition_order, FLAC__Subframe *subframe); |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 82 | static unsigned encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned bits_per_sample, FLAC__Subframe *subframe); |
Josh Coalson | e77287e | 2001-01-20 01:27:55 +0000 | [diff] [blame] | 83 | static unsigned encoder_find_best_partition_order_(const int32 residual[], uint32 abs_residual[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned max_partition_order, unsigned *best_partition_order, unsigned best_parameters[]); |
Josh Coalson | 3b5f471 | 2001-03-21 22:53:43 +0000 | [diff] [blame] | 84 | static bool encoder_set_partitioned_rice_(const uint32 abs_residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned rice_parameter, const unsigned partition_order, unsigned parameters[], unsigned *bits); |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 85 | |
Josh Coalson | cbf595f | 2000-12-22 22:35:33 +0000 | [diff] [blame] | 86 | const char *FLAC__EncoderWriteStatusString[] = { |
| 87 | "FLAC__ENCODER_WRITE_OK", |
| 88 | "FLAC__ENCODER_WRITE_FATAL_ERROR" |
| 89 | }; |
| 90 | |
| 91 | const char *FLAC__EncoderStateString[] = { |
| 92 | "FLAC__ENCODER_OK", |
| 93 | "FLAC__ENCODER_UNINITIALIZED", |
| 94 | "FLAC__ENCODER_INVALID_NUMBER_OF_CHANNELS", |
| 95 | "FLAC__ENCODER_INVALID_BITS_PER_SAMPLE", |
| 96 | "FLAC__ENCODER_INVALID_SAMPLE_RATE", |
| 97 | "FLAC__ENCODER_INVALID_BLOCK_SIZE", |
| 98 | "FLAC__ENCODER_INVALID_QLP_COEFF_PRECISION", |
| 99 | "FLAC__ENCODER_MID_SIDE_CHANNELS_MISMATCH", |
| 100 | "FLAC__ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH", |
Josh Coalson | 69f1ee0 | 2001-01-24 00:54:43 +0000 | [diff] [blame] | 101 | "FLAC__ENCODER_ILLEGAL_MID_SIDE_FORCE", |
Josh Coalson | cbf595f | 2000-12-22 22:35:33 +0000 | [diff] [blame] | 102 | "FLAC__ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER", |
| 103 | "FLAC__ENCODER_NOT_STREAMABLE", |
| 104 | "FLAC__ENCODER_FRAMING_ERROR", |
| 105 | "FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING", |
| 106 | "FLAC__ENCODER_FATAL_ERROR_WHILE_WRITING", |
| 107 | "FLAC__ENCODER_MEMORY_ALLOCATION_ERROR" |
| 108 | }; |
| 109 | |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 110 | |
| 111 | bool encoder_resize_buffers_(FLAC__Encoder *encoder, unsigned new_size) |
| 112 | { |
| 113 | bool ok; |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 114 | unsigned i, channel; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 115 | int32 *previous_is, *current_is; |
| 116 | real *previous_rs, *current_rs; |
| 117 | int32 *residual; |
Josh Coalson | e77287e | 2001-01-20 01:27:55 +0000 | [diff] [blame] | 118 | uint32 *abs_residual; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 119 | |
| 120 | assert(new_size > 0); |
| 121 | assert(encoder->state == FLAC__ENCODER_OK); |
| 122 | assert(encoder->guts->current_sample_number == 0); |
| 123 | |
| 124 | /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */ |
| 125 | if(new_size <= encoder->guts->input_capacity) |
| 126 | return true; |
| 127 | |
| 128 | ok = 1; |
| 129 | if(ok) { |
| 130 | for(i = 0; ok && i < encoder->channels; i++) { |
| 131 | /* integer version of the signal */ |
| 132 | previous_is = encoder->guts->integer_signal[i]; |
| 133 | current_is = (int32*)malloc(sizeof(int32) * new_size); |
| 134 | if(0 == current_is) { |
| 135 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 136 | ok = 0; |
| 137 | } |
| 138 | else { |
| 139 | encoder->guts->integer_signal[i] = current_is; |
| 140 | if(previous_is != 0) |
| 141 | free(previous_is); |
| 142 | } |
| 143 | /* real version of the signal */ |
| 144 | previous_rs = encoder->guts->real_signal[i]; |
| 145 | current_rs = (real*)malloc(sizeof(real) * new_size); |
| 146 | if(0 == current_rs) { |
| 147 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 148 | ok = 0; |
| 149 | } |
| 150 | else { |
| 151 | encoder->guts->real_signal[i] = current_rs; |
| 152 | if(previous_rs != 0) |
| 153 | free(previous_rs); |
| 154 | } |
| 155 | } |
| 156 | } |
| 157 | if(ok) { |
| 158 | for(i = 0; ok && i < 2; i++) { |
| 159 | /* integer version of the signal */ |
| 160 | previous_is = encoder->guts->integer_signal_mid_side[i]; |
| 161 | current_is = (int32*)malloc(sizeof(int32) * new_size); |
| 162 | if(0 == current_is) { |
| 163 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 164 | ok = 0; |
| 165 | } |
| 166 | else { |
| 167 | encoder->guts->integer_signal_mid_side[i] = current_is; |
| 168 | if(previous_is != 0) |
| 169 | free(previous_is); |
| 170 | } |
| 171 | /* real version of the signal */ |
| 172 | previous_rs = encoder->guts->real_signal_mid_side[i]; |
| 173 | current_rs = (real*)malloc(sizeof(real) * new_size); |
| 174 | if(0 == current_rs) { |
| 175 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 176 | ok = 0; |
| 177 | } |
| 178 | else { |
| 179 | encoder->guts->real_signal_mid_side[i] = current_rs; |
| 180 | if(previous_rs != 0) |
| 181 | free(previous_rs); |
| 182 | } |
| 183 | } |
| 184 | } |
| 185 | if(ok) { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 186 | for(channel = 0; channel < encoder->channels; channel++) { |
| 187 | for(i = 0; i < 2; i++) { |
| 188 | residual = (int32*)malloc(sizeof(int32) * new_size); |
| 189 | if(0 == residual) { |
| 190 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 191 | ok = 0; |
| 192 | } |
| 193 | else { |
| 194 | if(encoder->guts->residual_workspace[channel][i] != 0) |
| 195 | free(encoder->guts->residual_workspace[channel][i]); |
| 196 | encoder->guts->residual_workspace[channel][i] = residual; |
| 197 | } |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 198 | } |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 199 | } |
| 200 | for(channel = 0; channel < 2; channel++) { |
| 201 | for(i = 0; i < 2; i++) { |
| 202 | residual = (int32*)malloc(sizeof(int32) * new_size); |
| 203 | if(0 == residual) { |
| 204 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 205 | ok = 0; |
| 206 | } |
| 207 | else { |
| 208 | if(encoder->guts->residual_workspace_mid_side[channel][i] != 0) |
| 209 | free(encoder->guts->residual_workspace_mid_side[channel][i]); |
| 210 | encoder->guts->residual_workspace_mid_side[channel][i] = residual; |
| 211 | } |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 212 | } |
| 213 | } |
Josh Coalson | e77287e | 2001-01-20 01:27:55 +0000 | [diff] [blame] | 214 | abs_residual = (uint32*)malloc(sizeof(uint32) * new_size); |
| 215 | if(0 == residual) { |
| 216 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 217 | ok = 0; |
| 218 | } |
| 219 | else { |
| 220 | if(encoder->guts->abs_residual != 0) |
| 221 | free(encoder->guts->abs_residual); |
| 222 | encoder->guts->abs_residual = abs_residual; |
| 223 | } |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 224 | } |
| 225 | if(ok) |
| 226 | encoder->guts->input_capacity = new_size; |
| 227 | |
| 228 | return ok; |
| 229 | } |
| 230 | |
| 231 | FLAC__Encoder *FLAC__encoder_get_new_instance() |
| 232 | { |
| 233 | FLAC__Encoder *encoder = (FLAC__Encoder*)malloc(sizeof(FLAC__Encoder)); |
| 234 | if(encoder != 0) { |
| 235 | encoder->state = FLAC__ENCODER_UNINITIALIZED; |
| 236 | encoder->guts = 0; |
| 237 | } |
| 238 | return encoder; |
| 239 | } |
| 240 | |
| 241 | void FLAC__encoder_free_instance(FLAC__Encoder *encoder) |
| 242 | { |
| 243 | assert(encoder != 0); |
| 244 | free(encoder); |
| 245 | } |
| 246 | |
| 247 | FLAC__EncoderState FLAC__encoder_init(FLAC__Encoder *encoder, FLAC__EncoderWriteStatus (*write_callback)(const FLAC__Encoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data), void (*metadata_callback)(const FLAC__Encoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data), void *client_data) |
| 248 | { |
| 249 | unsigned i; |
Josh Coalson | c692d38 | 2001-02-23 21:05:05 +0000 | [diff] [blame] | 250 | FLAC__StreamMetaData padding; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 251 | |
| 252 | assert(sizeof(int) >= 4); /* we want to die right away if this is not true */ |
| 253 | assert(encoder != 0); |
| 254 | assert(write_callback != 0); |
| 255 | assert(metadata_callback != 0); |
| 256 | assert(encoder->state == FLAC__ENCODER_UNINITIALIZED); |
| 257 | assert(encoder->guts == 0); |
| 258 | |
| 259 | encoder->state = FLAC__ENCODER_OK; |
| 260 | |
| 261 | if(encoder->channels == 0 || encoder->channels > FLAC__MAX_CHANNELS) |
| 262 | return encoder->state = FLAC__ENCODER_INVALID_NUMBER_OF_CHANNELS; |
| 263 | |
| 264 | if(encoder->do_mid_side_stereo && encoder->channels != 2) |
| 265 | return encoder->state = FLAC__ENCODER_MID_SIDE_CHANNELS_MISMATCH; |
| 266 | |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 267 | if(encoder->loose_mid_side_stereo && !encoder->do_mid_side_stereo) |
Josh Coalson | 69f1ee0 | 2001-01-24 00:54:43 +0000 | [diff] [blame] | 268 | return encoder->state = FLAC__ENCODER_ILLEGAL_MID_SIDE_FORCE; |
| 269 | |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 270 | if(encoder->bits_per_sample == 0 || encoder->bits_per_sample > FLAC__MAX_BITS_PER_SAMPLE) |
| 271 | return encoder->state = FLAC__ENCODER_INVALID_BITS_PER_SAMPLE; |
| 272 | |
| 273 | if(encoder->sample_rate == 0 || encoder->sample_rate > FLAC__MAX_SAMPLE_RATE) |
| 274 | return encoder->state = FLAC__ENCODER_INVALID_SAMPLE_RATE; |
| 275 | |
| 276 | if(encoder->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->blocksize > FLAC__MAX_BLOCK_SIZE) |
| 277 | return encoder->state = FLAC__ENCODER_INVALID_BLOCK_SIZE; |
| 278 | |
| 279 | if(encoder->blocksize < encoder->max_lpc_order) |
| 280 | return encoder->state = FLAC__ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER; |
| 281 | |
| 282 | if(encoder->qlp_coeff_precision == 0) { |
| 283 | if(encoder->bits_per_sample < 16) { |
| 284 | /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */ |
| 285 | /* @@@ until then we'll make a guess */ |
| 286 | encoder->qlp_coeff_precision = max(5, 2 + encoder->bits_per_sample / 2); |
| 287 | } |
| 288 | else if(encoder->bits_per_sample == 16) { |
| 289 | if(encoder->blocksize <= 192) |
| 290 | encoder->qlp_coeff_precision = 7; |
| 291 | else if(encoder->blocksize <= 384) |
| 292 | encoder->qlp_coeff_precision = 8; |
| 293 | else if(encoder->blocksize <= 576) |
| 294 | encoder->qlp_coeff_precision = 9; |
| 295 | else if(encoder->blocksize <= 1152) |
| 296 | encoder->qlp_coeff_precision = 10; |
| 297 | else if(encoder->blocksize <= 2304) |
| 298 | encoder->qlp_coeff_precision = 11; |
| 299 | else if(encoder->blocksize <= 4608) |
| 300 | encoder->qlp_coeff_precision = 12; |
| 301 | else |
| 302 | encoder->qlp_coeff_precision = 13; |
| 303 | } |
| 304 | else { |
| 305 | encoder->qlp_coeff_precision = min(13, 8*sizeof(int32) - encoder->bits_per_sample - 1); |
| 306 | } |
| 307 | } |
Josh Coalson | 0552fdf | 2001-02-26 20:29:56 +0000 | [diff] [blame] | 308 | else if(encoder->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->qlp_coeff_precision + encoder->bits_per_sample >= 8*sizeof(uint32) || encoder->qlp_coeff_precision >= (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)) |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 309 | return encoder->state = FLAC__ENCODER_INVALID_QLP_COEFF_PRECISION; |
| 310 | |
| 311 | if(encoder->streamable_subset) { |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame^] | 312 | //@@@ add check for blocksize here |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 313 | if(encoder->bits_per_sample != 8 && encoder->bits_per_sample != 12 && encoder->bits_per_sample != 16 && encoder->bits_per_sample != 20 && encoder->bits_per_sample != 24) |
| 314 | return encoder->state = FLAC__ENCODER_NOT_STREAMABLE; |
| 315 | if(encoder->sample_rate > 655350) |
| 316 | return encoder->state = FLAC__ENCODER_NOT_STREAMABLE; |
| 317 | } |
| 318 | |
| 319 | if(encoder->rice_optimization_level >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) |
| 320 | encoder->rice_optimization_level = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1; |
| 321 | |
| 322 | encoder->guts = (FLAC__EncoderPrivate*)malloc(sizeof(FLAC__EncoderPrivate)); |
| 323 | if(encoder->guts == 0) |
| 324 | return encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 325 | |
| 326 | encoder->guts->input_capacity = 0; |
| 327 | for(i = 0; i < encoder->channels; i++) { |
| 328 | encoder->guts->integer_signal[i] = 0; |
| 329 | encoder->guts->real_signal[i] = 0; |
| 330 | } |
| 331 | for(i = 0; i < 2; i++) { |
| 332 | encoder->guts->integer_signal_mid_side[i] = 0; |
| 333 | encoder->guts->real_signal_mid_side[i] = 0; |
| 334 | } |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 335 | for(i = 0; i < encoder->channels; i++) { |
| 336 | encoder->guts->residual_workspace[i][0] = encoder->guts->residual_workspace[i][1] = 0; |
| 337 | encoder->guts->best_subframe[i] = 0; |
| 338 | } |
| 339 | for(i = 0; i < 2; i++) { |
| 340 | encoder->guts->residual_workspace_mid_side[i][0] = encoder->guts->residual_workspace_mid_side[i][1] = 0; |
| 341 | encoder->guts->best_subframe_mid_side[i] = 0; |
| 342 | } |
| 343 | for(i = 0; i < encoder->channels; i++) { |
| 344 | encoder->guts->subframe_workspace_ptr[i][0] = &encoder->guts->subframe_workspace[i][0]; |
| 345 | encoder->guts->subframe_workspace_ptr[i][1] = &encoder->guts->subframe_workspace[i][1]; |
| 346 | } |
| 347 | for(i = 0; i < 2; i++) { |
| 348 | encoder->guts->subframe_workspace_ptr_mid_side[i][0] = &encoder->guts->subframe_workspace_mid_side[i][0]; |
| 349 | encoder->guts->subframe_workspace_ptr_mid_side[i][1] = &encoder->guts->subframe_workspace_mid_side[i][1]; |
| 350 | } |
Josh Coalson | e77287e | 2001-01-20 01:27:55 +0000 | [diff] [blame] | 351 | encoder->guts->abs_residual = 0; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 352 | encoder->guts->current_frame_can_do_mid_side = true; |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 353 | encoder->guts->loose_mid_side_stereo_frames_exact = (double)encoder->sample_rate * 0.4 / (double)encoder->blocksize; |
| 354 | encoder->guts->loose_mid_side_stereo_frames = (unsigned)(encoder->guts->loose_mid_side_stereo_frames_exact + 0.5); |
| 355 | if(encoder->guts->loose_mid_side_stereo_frames == 0) |
| 356 | encoder->guts->loose_mid_side_stereo_frames = 1; |
| 357 | encoder->guts->loose_mid_side_stereo_frame_count = 0; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 358 | encoder->guts->current_sample_number = 0; |
| 359 | encoder->guts->current_frame_number = 0; |
| 360 | |
| 361 | if(!encoder_resize_buffers_(encoder, encoder->blocksize)) { |
| 362 | /* the above function sets the state for us in case of an error */ |
| 363 | return encoder->state; |
| 364 | } |
| 365 | FLAC__bitbuffer_init(&encoder->guts->frame); |
| 366 | encoder->guts->write_callback = write_callback; |
| 367 | encoder->guts->metadata_callback = metadata_callback; |
| 368 | encoder->guts->client_data = client_data; |
| 369 | |
| 370 | /* |
| 371 | * write the stream header |
| 372 | */ |
| 373 | if(!FLAC__bitbuffer_clear(&encoder->guts->frame)) |
| 374 | return encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 375 | |
| 376 | if(!FLAC__bitbuffer_write_raw_uint32(&encoder->guts->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN)) |
| 377 | return encoder->state = FLAC__ENCODER_FRAMING_ERROR; |
| 378 | |
Josh Coalson | c692d38 | 2001-02-23 21:05:05 +0000 | [diff] [blame] | 379 | encoder->guts->metadata.type = FLAC__METADATA_TYPE_STREAMINFO; |
| 380 | encoder->guts->metadata.is_last = (encoder->padding == 0); |
| 381 | encoder->guts->metadata.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH; |
| 382 | encoder->guts->metadata.data.stream_info.min_blocksize = encoder->blocksize; /* this encoder uses the same blocksize for the whole stream */ |
| 383 | encoder->guts->metadata.data.stream_info.max_blocksize = encoder->blocksize; |
| 384 | encoder->guts->metadata.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */ |
| 385 | encoder->guts->metadata.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */ |
| 386 | encoder->guts->metadata.data.stream_info.sample_rate = encoder->sample_rate; |
| 387 | encoder->guts->metadata.data.stream_info.channels = encoder->channels; |
| 388 | encoder->guts->metadata.data.stream_info.bits_per_sample = encoder->bits_per_sample; |
| 389 | encoder->guts->metadata.data.stream_info.total_samples = encoder->total_samples_estimate; /* we will replace this later with the real total */ |
| 390 | memset(encoder->guts->metadata.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */ |
Josh Coalson | fa37f1c | 2001-01-12 23:55:11 +0000 | [diff] [blame] | 391 | MD5Init(&encoder->guts->md5context); |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 392 | if(!FLAC__add_metadata_block(&encoder->guts->metadata, &encoder->guts->frame)) |
| 393 | return encoder->state = FLAC__ENCODER_FRAMING_ERROR; |
| 394 | |
Josh Coalson | c692d38 | 2001-02-23 21:05:05 +0000 | [diff] [blame] | 395 | /* add a PADDING block if requested */ |
| 396 | if(encoder->padding > 0) { |
| 397 | padding.type = FLAC__METADATA_TYPE_PADDING; |
| 398 | padding.is_last = true; |
| 399 | padding.length = encoder->padding; |
| 400 | if(!FLAC__add_metadata_block(&padding, &encoder->guts->frame)) |
| 401 | return encoder->state = FLAC__ENCODER_FRAMING_ERROR; |
| 402 | } |
| 403 | |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 404 | assert(encoder->guts->frame.bits == 0); /* assert that we're byte-aligned before writing */ |
| 405 | assert(encoder->guts->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */ |
| 406 | if(encoder->guts->write_callback(encoder, encoder->guts->frame.buffer, encoder->guts->frame.bytes, 0, encoder->guts->current_frame_number, encoder->guts->client_data) != FLAC__ENCODER_WRITE_OK) |
| 407 | return encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_WRITING; |
| 408 | |
Josh Coalson | cbbbb5f | 2001-01-23 00:41:48 +0000 | [diff] [blame] | 409 | /* now that the metadata block is written, we can init this to an absurdly-high value... */ |
Josh Coalson | c692d38 | 2001-02-23 21:05:05 +0000 | [diff] [blame] | 410 | encoder->guts->metadata.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1; |
Josh Coalson | cbbbb5f | 2001-01-23 00:41:48 +0000 | [diff] [blame] | 411 | /* ... and clear this to 0 */ |
Josh Coalson | c692d38 | 2001-02-23 21:05:05 +0000 | [diff] [blame] | 412 | encoder->guts->metadata.data.stream_info.total_samples = 0; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 413 | |
| 414 | return encoder->state; |
| 415 | } |
| 416 | |
| 417 | void FLAC__encoder_finish(FLAC__Encoder *encoder) |
| 418 | { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 419 | unsigned i, channel; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 420 | |
| 421 | assert(encoder != 0); |
| 422 | if(encoder->state == FLAC__ENCODER_UNINITIALIZED) |
| 423 | return; |
| 424 | if(encoder->guts->current_sample_number != 0) { |
| 425 | encoder->blocksize = encoder->guts->current_sample_number; |
| 426 | encoder_process_frame_(encoder, true); /* true => is last frame */ |
| 427 | } |
Josh Coalson | c692d38 | 2001-02-23 21:05:05 +0000 | [diff] [blame] | 428 | MD5Final(encoder->guts->metadata.data.stream_info.md5sum, &encoder->guts->md5context); |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 429 | encoder->guts->metadata_callback(encoder, &encoder->guts->metadata, encoder->guts->client_data); |
| 430 | if(encoder->guts != 0) { |
| 431 | for(i = 0; i < encoder->channels; i++) { |
| 432 | if(encoder->guts->integer_signal[i] != 0) { |
| 433 | free(encoder->guts->integer_signal[i]); |
| 434 | encoder->guts->integer_signal[i] = 0; |
| 435 | } |
| 436 | if(encoder->guts->real_signal[i] != 0) { |
| 437 | free(encoder->guts->real_signal[i]); |
| 438 | encoder->guts->real_signal[i] = 0; |
| 439 | } |
| 440 | } |
| 441 | for(i = 0; i < 2; i++) { |
| 442 | if(encoder->guts->integer_signal_mid_side[i] != 0) { |
| 443 | free(encoder->guts->integer_signal_mid_side[i]); |
| 444 | encoder->guts->integer_signal_mid_side[i] = 0; |
| 445 | } |
| 446 | if(encoder->guts->real_signal_mid_side[i] != 0) { |
| 447 | free(encoder->guts->real_signal_mid_side[i]); |
| 448 | encoder->guts->real_signal_mid_side[i] = 0; |
| 449 | } |
| 450 | } |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 451 | for(channel = 0; channel < encoder->channels; channel++) { |
| 452 | for(i = 0; i < 2; i++) { |
| 453 | if(encoder->guts->residual_workspace[channel][i] != 0) { |
| 454 | free(encoder->guts->residual_workspace[channel][i]); |
| 455 | encoder->guts->residual_workspace[channel][i] = 0; |
| 456 | } |
| 457 | } |
| 458 | } |
| 459 | for(channel = 0; channel < 2; channel++) { |
| 460 | for(i = 0; i < 2; i++) { |
| 461 | if(encoder->guts->residual_workspace_mid_side[channel][i] != 0) { |
| 462 | free(encoder->guts->residual_workspace_mid_side[channel][i]); |
| 463 | encoder->guts->residual_workspace_mid_side[channel][i] = 0; |
| 464 | } |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 465 | } |
| 466 | } |
Josh Coalson | e77287e | 2001-01-20 01:27:55 +0000 | [diff] [blame] | 467 | if(encoder->guts->abs_residual != 0) { |
| 468 | free(encoder->guts->abs_residual); |
| 469 | encoder->guts->abs_residual = 0; |
| 470 | } |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 471 | FLAC__bitbuffer_free(&encoder->guts->frame); |
| 472 | free(encoder->guts); |
| 473 | encoder->guts = 0; |
| 474 | } |
| 475 | encoder->state = FLAC__ENCODER_UNINITIALIZED; |
| 476 | } |
| 477 | |
| 478 | bool FLAC__encoder_process(FLAC__Encoder *encoder, const int32 *buf[], unsigned samples) |
| 479 | { |
| 480 | unsigned i, j, channel; |
| 481 | int32 x, mid, side; |
| 482 | const bool ms = encoder->do_mid_side_stereo && encoder->channels == 2; |
| 483 | const int32 min_side = -((int64)1 << (encoder->bits_per_sample-1)); |
| 484 | const int32 max_side = ((int64)1 << (encoder->bits_per_sample-1)) - 1; |
| 485 | |
| 486 | assert(encoder != 0); |
| 487 | assert(encoder->state == FLAC__ENCODER_OK); |
| 488 | |
| 489 | j = 0; |
| 490 | do { |
| 491 | for(i = encoder->guts->current_sample_number; i < encoder->blocksize && j < samples; i++, j++) { |
| 492 | for(channel = 0; channel < encoder->channels; channel++) { |
| 493 | x = buf[channel][j]; |
| 494 | encoder->guts->integer_signal[channel][i] = x; |
| 495 | encoder->guts->real_signal[channel][i] = (real)x; |
| 496 | } |
| 497 | if(ms && encoder->guts->current_frame_can_do_mid_side) { |
| 498 | side = buf[0][j] - buf[1][j]; |
| 499 | if(side < min_side || side > max_side) { |
| 500 | encoder->guts->current_frame_can_do_mid_side = false; |
| 501 | } |
| 502 | else { |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 503 | mid = (buf[0][j] + buf[1][j]) >> 1; /* NOTE: not the same as 'mid = (buf[0][j] + buf[1][j]) / 2' ! */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 504 | encoder->guts->integer_signal_mid_side[0][i] = mid; |
| 505 | encoder->guts->integer_signal_mid_side[1][i] = side; |
| 506 | encoder->guts->real_signal_mid_side[0][i] = (real)mid; |
| 507 | encoder->guts->real_signal_mid_side[1][i] = (real)side; |
| 508 | } |
| 509 | } |
| 510 | encoder->guts->current_sample_number++; |
| 511 | } |
| 512 | if(i == encoder->blocksize) { |
| 513 | if(!encoder_process_frame_(encoder, false)) /* false => not last frame */ |
| 514 | return false; |
| 515 | } |
| 516 | } while(j < samples); |
| 517 | |
| 518 | return true; |
| 519 | } |
| 520 | |
| 521 | /* 'samples' is channel-wide samples, e.g. for 1 second at 44100Hz, 'samples' = 44100 regardless of the number of channels */ |
| 522 | bool FLAC__encoder_process_interleaved(FLAC__Encoder *encoder, const int32 buf[], unsigned samples) |
| 523 | { |
| 524 | unsigned i, j, k, channel; |
| 525 | int32 x, left = 0, mid, side; |
| 526 | const bool ms = encoder->do_mid_side_stereo && encoder->channels == 2; |
| 527 | const int32 min_side = -((int64)1 << (encoder->bits_per_sample-1)); |
| 528 | const int32 max_side = ((int64)1 << (encoder->bits_per_sample-1)) - 1; |
| 529 | |
| 530 | assert(encoder != 0); |
| 531 | assert(encoder->state == FLAC__ENCODER_OK); |
| 532 | |
| 533 | j = k = 0; |
| 534 | do { |
| 535 | for(i = encoder->guts->current_sample_number; i < encoder->blocksize && j < samples; i++, j++, k++) { |
| 536 | for(channel = 0; channel < encoder->channels; channel++, k++) { |
| 537 | x = buf[k]; |
| 538 | encoder->guts->integer_signal[channel][i] = x; |
| 539 | encoder->guts->real_signal[channel][i] = (real)x; |
| 540 | if(ms && encoder->guts->current_frame_can_do_mid_side) { |
| 541 | if(channel == 0) { |
| 542 | left = x; |
| 543 | } |
| 544 | else { |
| 545 | side = left - x; |
| 546 | if(side < min_side || side > max_side) { |
| 547 | encoder->guts->current_frame_can_do_mid_side = false; |
| 548 | } |
| 549 | else { |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 550 | mid = (left + x) >> 1; /* NOTE: not the same as 'mid = (left + x) / 2' ! */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 551 | encoder->guts->integer_signal_mid_side[0][i] = mid; |
| 552 | encoder->guts->integer_signal_mid_side[1][i] = side; |
| 553 | encoder->guts->real_signal_mid_side[0][i] = (real)mid; |
| 554 | encoder->guts->real_signal_mid_side[1][i] = (real)side; |
| 555 | } |
| 556 | } |
| 557 | } |
| 558 | } |
| 559 | encoder->guts->current_sample_number++; |
| 560 | } |
| 561 | if(i == encoder->blocksize) { |
| 562 | if(!encoder_process_frame_(encoder, false)) /* false => not last frame */ |
| 563 | return false; |
| 564 | } |
| 565 | } while(j < samples); |
| 566 | |
| 567 | return true; |
| 568 | } |
| 569 | |
| 570 | bool encoder_process_frame_(FLAC__Encoder *encoder, bool is_last_frame) |
| 571 | { |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 572 | assert(encoder->state == FLAC__ENCODER_OK); |
| 573 | |
| 574 | /* |
Josh Coalson | fa37f1c | 2001-01-12 23:55:11 +0000 | [diff] [blame] | 575 | * Accumulate raw signal to the MD5 signature |
| 576 | */ |
| 577 | if(!FLAC__MD5Accumulate(&encoder->guts->md5context, encoder->guts->integer_signal, encoder->channels, encoder->blocksize, (encoder->bits_per_sample+7) / 8)) { |
| 578 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 579 | return false; |
| 580 | } |
| 581 | |
| 582 | /* |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 583 | * Process the frame header and subframes into the frame bitbuffer |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 584 | */ |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 585 | if(!encoder_process_subframes_(encoder, is_last_frame)) { |
| 586 | /* the above function sets the state for us in case of an error */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 587 | return false; |
| 588 | } |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 589 | |
| 590 | /* |
| 591 | * Zero-pad the frame to a byte_boundary |
| 592 | */ |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 593 | if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(&encoder->guts->frame)) { |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 594 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 595 | return false; |
| 596 | } |
| 597 | |
| 598 | /* |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame^] | 599 | * CRC-16 the whole thing |
| 600 | */ |
| 601 | assert(encoder->guts->frame.bits == 0); /* assert that we're byte-aligned */ |
| 602 | assert(encoder->guts->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */ |
| 603 | FLAC__bitbuffer_write_raw_uint32(&encoder->guts->frame, FLAC__crc16(encoder->guts->frame.buffer, encoder->guts->frame.bytes), FLAC__FRAME_FOOTER_CRC_LEN); |
| 604 | |
| 605 | /* |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 606 | * Write it |
| 607 | */ |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 608 | if(encoder->guts->write_callback(encoder, encoder->guts->frame.buffer, encoder->guts->frame.bytes, encoder->blocksize, encoder->guts->current_frame_number, encoder->guts->client_data) != FLAC__ENCODER_WRITE_OK) { |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 609 | encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_WRITING; |
| 610 | return false; |
| 611 | } |
| 612 | |
| 613 | /* |
| 614 | * Get ready for the next frame |
| 615 | */ |
| 616 | encoder->guts->current_frame_can_do_mid_side = true; |
| 617 | encoder->guts->current_sample_number = 0; |
| 618 | encoder->guts->current_frame_number++; |
Josh Coalson | c692d38 | 2001-02-23 21:05:05 +0000 | [diff] [blame] | 619 | encoder->guts->metadata.data.stream_info.total_samples += (uint64)encoder->blocksize; |
| 620 | encoder->guts->metadata.data.stream_info.min_framesize = min(encoder->guts->frame.bytes, encoder->guts->metadata.data.stream_info.min_framesize); |
| 621 | encoder->guts->metadata.data.stream_info.max_framesize = max(encoder->guts->frame.bytes, encoder->guts->metadata.data.stream_info.max_framesize); |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 622 | |
| 623 | return true; |
| 624 | } |
| 625 | |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 626 | bool encoder_process_subframes_(FLAC__Encoder *encoder, bool is_last_frame) |
| 627 | { |
| 628 | FLAC__FrameHeader frame_header; |
| 629 | unsigned channel, max_partition_order; |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 630 | bool do_independent, do_mid_side; |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 631 | |
| 632 | /* |
| 633 | * Calculate the max Rice partition order |
| 634 | */ |
| 635 | if(is_last_frame) { |
| 636 | max_partition_order = 0; |
| 637 | } |
| 638 | else { |
| 639 | unsigned limit = 0, b = encoder->blocksize; |
| 640 | while(!(b & 1)) { |
| 641 | limit++; |
| 642 | b >>= 1; |
| 643 | } |
| 644 | max_partition_order = min(encoder->rice_optimization_level, limit); |
| 645 | } |
| 646 | |
| 647 | /* |
| 648 | * Setup the frame |
| 649 | */ |
| 650 | if(!FLAC__bitbuffer_clear(&encoder->guts->frame)) { |
| 651 | encoder->state = FLAC__ENCODER_MEMORY_ALLOCATION_ERROR; |
| 652 | return false; |
| 653 | } |
| 654 | frame_header.blocksize = encoder->blocksize; |
| 655 | frame_header.sample_rate = encoder->sample_rate; |
| 656 | frame_header.channels = encoder->channels; |
| 657 | frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */ |
| 658 | frame_header.bits_per_sample = encoder->bits_per_sample; |
| 659 | frame_header.number.frame_number = encoder->guts->current_frame_number; |
| 660 | |
| 661 | /* |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 662 | * Figure out what channel assignments to try |
| 663 | */ |
| 664 | if(encoder->do_mid_side_stereo) { |
| 665 | if(encoder->loose_mid_side_stereo) { |
| 666 | if(encoder->guts->loose_mid_side_stereo_frame_count == 0) { |
| 667 | do_independent = true; |
| 668 | do_mid_side = true; |
| 669 | } |
| 670 | else { |
| 671 | do_independent = (encoder->guts->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT); |
| 672 | do_mid_side = !do_independent; |
| 673 | } |
| 674 | } |
| 675 | else { |
| 676 | do_independent = true; |
| 677 | do_mid_side = true; |
| 678 | } |
| 679 | } |
| 680 | else { |
| 681 | do_independent = true; |
| 682 | do_mid_side = false; |
| 683 | } |
| 684 | if(do_mid_side && !encoder->guts->current_frame_can_do_mid_side) { |
| 685 | do_independent = true; |
| 686 | do_mid_side = false; |
| 687 | } |
| 688 | |
| 689 | assert(do_independent || do_mid_side); |
| 690 | |
| 691 | /* |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 692 | * First do a normal encoding pass of each independent channel |
| 693 | */ |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 694 | if(do_independent) { |
| 695 | for(channel = 0; channel < encoder->channels; channel++) { |
| 696 | if(!encoder_process_subframe_(encoder, max_partition_order, false, &frame_header, encoder->bits_per_sample, encoder->guts->integer_signal[channel], encoder->guts->real_signal[channel], encoder->guts->subframe_workspace_ptr[channel], encoder->guts->residual_workspace[channel], encoder->guts->best_subframe+channel, encoder->guts->best_subframe_bits+channel)) |
| 697 | return false; |
| 698 | } |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | /* |
| 702 | * Now do mid and side channels if requested |
| 703 | */ |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 704 | if(do_mid_side) { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 705 | assert(encoder->channels == 2); |
| 706 | |
| 707 | for(channel = 0; channel < 2; channel++) { |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 708 | if(!encoder_process_subframe_(encoder, max_partition_order, false, &frame_header, encoder->bits_per_sample+(channel==0? 0:1), encoder->guts->integer_signal_mid_side[channel], encoder->guts->real_signal_mid_side[channel], encoder->guts->subframe_workspace_ptr_mid_side[channel], encoder->guts->residual_workspace_mid_side[channel], encoder->guts->best_subframe_mid_side+channel, encoder->guts->best_subframe_bits_mid_side+channel)) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 709 | return false; |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | /* |
| 714 | * Compose the frame bitbuffer |
| 715 | */ |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 716 | if(do_mid_side) { |
| 717 | FLAC__ChannelAssignment channel_assignment; |
| 718 | |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 719 | assert(encoder->channels == 2); |
| 720 | |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 721 | if(encoder->loose_mid_side_stereo && encoder->guts->loose_mid_side_stereo_frame_count > 0) { |
| 722 | channel_assignment = (encoder->guts->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE); |
| 723 | } |
| 724 | else { |
| 725 | unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */ |
| 726 | unsigned min_bits; |
| 727 | FLAC__ChannelAssignment ca; |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 728 | |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 729 | assert(do_independent && do_mid_side); |
| 730 | |
| 731 | /* We have to figure out which channel assignent results in the smallest frame */ |
| 732 | bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->guts->best_subframe_bits [0] + encoder->guts->best_subframe_bits [1]; |
| 733 | bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE ] = encoder->guts->best_subframe_bits [0] + encoder->guts->best_subframe_bits_mid_side[1]; |
| 734 | bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->guts->best_subframe_bits [1] + encoder->guts->best_subframe_bits_mid_side[1]; |
| 735 | bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE ] = encoder->guts->best_subframe_bits_mid_side[0] + encoder->guts->best_subframe_bits_mid_side[1]; |
| 736 | |
| 737 | for(channel_assignment = 0, min_bits = bits[0], ca = 1; ca <= 3; ca++) { |
| 738 | if(bits[ca] < min_bits) { |
| 739 | min_bits = bits[ca]; |
| 740 | channel_assignment = ca; |
| 741 | } |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 742 | } |
| 743 | } |
| 744 | |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 745 | frame_header.channel_assignment = channel_assignment; |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 746 | |
| 747 | if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame)) { |
| 748 | encoder->state = FLAC__ENCODER_FRAMING_ERROR; |
| 749 | return false; |
| 750 | } |
| 751 | |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 752 | switch(channel_assignment) { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 753 | /* note that encoder_add_subframe_ sets the state for us in case of an error */ |
| 754 | case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 755 | if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace [0][encoder->guts->best_subframe [0]], &encoder->guts->frame)) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 756 | return false; |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 757 | if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace [1][encoder->guts->best_subframe [1]], &encoder->guts->frame)) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 758 | return false; |
| 759 | break; |
| 760 | case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 761 | if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace [0][encoder->guts->best_subframe [0]], &encoder->guts->frame)) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 762 | return false; |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 763 | if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample+1, &encoder->guts->subframe_workspace_mid_side[1][encoder->guts->best_subframe_mid_side[1]], &encoder->guts->frame)) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 764 | return false; |
| 765 | break; |
| 766 | case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 767 | if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample+1, &encoder->guts->subframe_workspace_mid_side[1][encoder->guts->best_subframe_mid_side[1]], &encoder->guts->frame)) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 768 | return false; |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 769 | if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace [1][encoder->guts->best_subframe [1]], &encoder->guts->frame)) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 770 | return false; |
| 771 | break; |
| 772 | case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 773 | if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample , &encoder->guts->subframe_workspace_mid_side[0][encoder->guts->best_subframe_mid_side[0]], &encoder->guts->frame)) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 774 | return false; |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 775 | if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample+1, &encoder->guts->subframe_workspace_mid_side[1][encoder->guts->best_subframe_mid_side[1]], &encoder->guts->frame)) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 776 | return false; |
| 777 | break; |
| 778 | default: |
| 779 | assert(0); |
| 780 | } |
| 781 | } |
| 782 | else { |
| 783 | if(!FLAC__frame_add_header(&frame_header, encoder->streamable_subset, is_last_frame, &encoder->guts->frame)) { |
| 784 | encoder->state = FLAC__ENCODER_FRAMING_ERROR; |
| 785 | return false; |
| 786 | } |
| 787 | |
| 788 | for(channel = 0; channel < encoder->channels; channel++) { |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 789 | if(!encoder_add_subframe_(encoder, &frame_header, encoder->bits_per_sample, &encoder->guts->subframe_workspace[channel][encoder->guts->best_subframe[channel]], &encoder->guts->frame)) { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 790 | /* the above function sets the state for us in case of an error */ |
| 791 | return false; |
| 792 | } |
| 793 | } |
| 794 | } |
| 795 | |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 796 | if(encoder->loose_mid_side_stereo) { |
| 797 | encoder->guts->loose_mid_side_stereo_frame_count++; |
| 798 | if(encoder->guts->loose_mid_side_stereo_frame_count >= encoder->guts->loose_mid_side_stereo_frames) |
| 799 | encoder->guts->loose_mid_side_stereo_frame_count = 0; |
| 800 | } |
| 801 | |
| 802 | encoder->guts->last_channel_assignment = frame_header.channel_assignment; |
| 803 | |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 804 | return true; |
| 805 | } |
| 806 | |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 807 | bool encoder_process_subframe_(FLAC__Encoder *encoder, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned bits_per_sample, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 808 | { |
| 809 | real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]; |
| 810 | real lpc_residual_bits_per_sample; |
| 811 | real autoc[FLAC__MAX_LPC_ORDER+1]; |
| 812 | real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER]; |
| 813 | real lpc_error[FLAC__MAX_LPC_ORDER]; |
| 814 | unsigned min_lpc_order, max_lpc_order, lpc_order; |
| 815 | unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order; |
| 816 | unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision; |
| 817 | unsigned rice_parameter; |
| 818 | unsigned _candidate_bits, _best_bits; |
| 819 | unsigned _best_subframe; |
| 820 | |
| 821 | /* verbatim subframe is the baseline against which we measure other compressed subframes */ |
| 822 | _best_subframe = 0; |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 823 | _best_bits = encoder_evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, bits_per_sample, subframe[_best_subframe]); |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 824 | |
| 825 | if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) { |
| 826 | /* check for constant subframe */ |
| 827 | guess_fixed_order = FLAC__fixed_compute_best_predictor(integer_signal+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample); |
| 828 | if(fixed_residual_bits_per_sample[1] == 0.0) { |
| 829 | /* the above means integer_signal+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */ |
| 830 | unsigned i, signal_is_constant = true; |
| 831 | for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) { |
| 832 | if(integer_signal[0] != integer_signal[i]) { |
| 833 | signal_is_constant = false; |
| 834 | break; |
| 835 | } |
| 836 | } |
| 837 | if(signal_is_constant) { |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 838 | _candidate_bits = encoder_evaluate_constant_subframe_(integer_signal[0], bits_per_sample, subframe[!_best_subframe]); |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 839 | if(_candidate_bits < _best_bits) { |
| 840 | _best_subframe = !_best_subframe; |
| 841 | _best_bits = _candidate_bits; |
| 842 | } |
| 843 | } |
| 844 | } |
| 845 | else { |
| 846 | /* encode fixed */ |
| 847 | if(encoder->do_exhaustive_model_search) { |
| 848 | min_fixed_order = 0; |
| 849 | max_fixed_order = FLAC__MAX_FIXED_ORDER; |
| 850 | } |
| 851 | else { |
| 852 | min_fixed_order = max_fixed_order = guess_fixed_order; |
| 853 | } |
| 854 | for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) { |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 855 | if(fixed_residual_bits_per_sample[fixed_order] >= (real)bits_per_sample) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 856 | continue; /* don't even try */ |
Josh Coalson | 46f2ae8 | 2001-02-08 00:27:21 +0000 | [diff] [blame] | 857 | rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > 0.0)? (unsigned)(fixed_residual_bits_per_sample[fixed_order]+0.5) : 0; /* 0.5 is for rounding */ |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 858 | #ifndef SYMMETRIC_RICE |
Josh Coalson | 46f2ae8 | 2001-02-08 00:27:21 +0000 | [diff] [blame] | 859 | rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */ |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 860 | #endif |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 861 | if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)) |
| 862 | rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1; |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 863 | _candidate_bits = encoder_evaluate_fixed_subframe_(integer_signal, residual[!_best_subframe], encoder->guts->abs_residual, frame_header->blocksize, bits_per_sample, fixed_order, rice_parameter, max_partition_order, subframe[!_best_subframe]); |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 864 | if(_candidate_bits < _best_bits) { |
| 865 | _best_subframe = !_best_subframe; |
| 866 | _best_bits = _candidate_bits; |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | /* encode lpc */ |
| 871 | if(encoder->max_lpc_order > 0) { |
| 872 | if(encoder->max_lpc_order >= frame_header->blocksize) |
| 873 | max_lpc_order = frame_header->blocksize-1; |
| 874 | else |
| 875 | max_lpc_order = encoder->max_lpc_order; |
| 876 | if(max_lpc_order > 0) { |
| 877 | FLAC__lpc_compute_autocorrelation(real_signal, frame_header->blocksize, max_lpc_order+1, autoc); |
Josh Coalson | f4ce50b | 2001-02-28 23:45:15 +0000 | [diff] [blame] | 878 | /* if autoc[0] == 0.0, the signal is constant and we usually won't get here, but it can happen */ |
| 879 | if(autoc[0] != 0.0) { |
| 880 | FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, lp_coeff, lpc_error); |
| 881 | if(encoder->do_exhaustive_model_search) { |
| 882 | min_lpc_order = 1; |
| 883 | } |
| 884 | else { |
| 885 | unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, bits_per_sample); |
| 886 | min_lpc_order = max_lpc_order = guess_lpc_order; |
| 887 | } |
| 888 | if(encoder->do_qlp_coeff_prec_search) { |
| 889 | min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION; |
| 890 | max_qlp_coeff_precision = min(32 - bits_per_sample - 1, (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)-1); |
| 891 | } |
| 892 | else { |
| 893 | min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->qlp_coeff_precision; |
| 894 | } |
| 895 | for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) { |
| 896 | lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order); |
| 897 | if(lpc_residual_bits_per_sample >= (real)bits_per_sample) |
| 898 | continue; /* don't even try */ |
| 899 | rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */ |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 900 | #ifndef SYMMETRIC_RICE |
Josh Coalson | f4ce50b | 2001-02-28 23:45:15 +0000 | [diff] [blame] | 901 | rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */ |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 902 | #endif |
Josh Coalson | f4ce50b | 2001-02-28 23:45:15 +0000 | [diff] [blame] | 903 | if(rice_parameter >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)) |
| 904 | rice_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1; |
| 905 | for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) { |
| 906 | _candidate_bits = encoder_evaluate_lpc_subframe_(integer_signal, residual[!_best_subframe], encoder->guts->abs_residual, lp_coeff[lpc_order-1], frame_header->blocksize, bits_per_sample, lpc_order, qlp_coeff_precision, rice_parameter, max_partition_order, subframe[!_best_subframe]); |
| 907 | if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */ |
| 908 | if(_candidate_bits < _best_bits) { |
| 909 | _best_subframe = !_best_subframe; |
| 910 | _best_bits = _candidate_bits; |
| 911 | } |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 912 | } |
| 913 | } |
| 914 | } |
| 915 | } |
| 916 | } |
| 917 | } |
| 918 | } |
| 919 | } |
| 920 | |
| 921 | *best_subframe = _best_subframe; |
| 922 | *best_bits = _best_bits; |
| 923 | |
| 924 | return true; |
| 925 | } |
| 926 | |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 927 | bool encoder_add_subframe_(FLAC__Encoder *encoder, const FLAC__FrameHeader *frame_header, unsigned bits_per_sample, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 928 | { |
| 929 | switch(subframe->type) { |
| 930 | case FLAC__SUBFRAME_TYPE_CONSTANT: |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 931 | if(!FLAC__subframe_add_constant(&(subframe->data.constant), bits_per_sample, frame)) { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 932 | encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING; |
| 933 | return false; |
| 934 | } |
| 935 | break; |
| 936 | case FLAC__SUBFRAME_TYPE_FIXED: |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 937 | if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), frame_header->blocksize - subframe->data.fixed.order, bits_per_sample, frame)) { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 938 | encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING; |
| 939 | return false; |
| 940 | } |
| 941 | break; |
| 942 | case FLAC__SUBFRAME_TYPE_LPC: |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 943 | if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), frame_header->blocksize - subframe->data.lpc.order, bits_per_sample, frame)) { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 944 | encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING; |
| 945 | return false; |
| 946 | } |
| 947 | break; |
| 948 | case FLAC__SUBFRAME_TYPE_VERBATIM: |
Josh Coalson | b5e60e5 | 2001-01-28 09:27:27 +0000 | [diff] [blame] | 949 | if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), frame_header->blocksize, bits_per_sample, frame)) { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 950 | encoder->state = FLAC__ENCODER_FATAL_ERROR_WHILE_ENCODING; |
| 951 | return false; |
| 952 | } |
| 953 | break; |
| 954 | default: |
| 955 | assert(0); |
| 956 | } |
| 957 | |
| 958 | return true; |
| 959 | } |
| 960 | |
| 961 | unsigned encoder_evaluate_constant_subframe_(const int32 signal, unsigned bits_per_sample, FLAC__Subframe *subframe) |
| 962 | { |
| 963 | subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT; |
| 964 | subframe->data.constant.value = signal; |
| 965 | |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame^] | 966 | return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + bits_per_sample; |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 967 | } |
| 968 | |
| 969 | unsigned encoder_evaluate_fixed_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], unsigned blocksize, unsigned bits_per_sample, unsigned order, unsigned rice_parameter, unsigned max_partition_order, FLAC__Subframe *subframe) |
| 970 | { |
| 971 | unsigned i, residual_bits; |
| 972 | const unsigned residual_samples = blocksize - order; |
| 973 | |
| 974 | FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual); |
| 975 | |
| 976 | subframe->type = FLAC__SUBFRAME_TYPE_FIXED; |
| 977 | |
| 978 | subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE; |
| 979 | subframe->data.fixed.residual = residual; |
| 980 | |
| 981 | residual_bits = encoder_find_best_partition_order_(residual, abs_residual, residual_samples, order, rice_parameter, max_partition_order, &subframe->data.fixed.entropy_coding_method.data.partitioned_rice.order, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.parameters); |
| 982 | |
| 983 | subframe->data.fixed.order = order; |
| 984 | for(i = 0; i < order; i++) |
| 985 | subframe->data.fixed.warmup[i] = signal[i]; |
| 986 | |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame^] | 987 | return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (order * bits_per_sample) + residual_bits; |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 988 | } |
| 989 | |
| 990 | unsigned encoder_evaluate_lpc_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], const real lp_coeff[], unsigned blocksize, unsigned bits_per_sample, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned max_partition_order, FLAC__Subframe *subframe) |
| 991 | { |
| 992 | int32 qlp_coeff[FLAC__MAX_LPC_ORDER]; |
| 993 | unsigned i, residual_bits; |
| 994 | int quantization, ret; |
| 995 | const unsigned residual_samples = blocksize - order; |
| 996 | |
| 997 | ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, bits_per_sample, qlp_coeff, &quantization); |
| 998 | if(ret != 0) |
| 999 | return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */ |
| 1000 | |
| 1001 | FLAC__lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual); |
| 1002 | |
| 1003 | subframe->type = FLAC__SUBFRAME_TYPE_LPC; |
| 1004 | |
| 1005 | subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE; |
| 1006 | subframe->data.lpc.residual = residual; |
| 1007 | |
| 1008 | residual_bits = encoder_find_best_partition_order_(residual, abs_residual, residual_samples, order, rice_parameter, max_partition_order, &subframe->data.lpc.entropy_coding_method.data.partitioned_rice.order, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.parameters); |
| 1009 | |
| 1010 | subframe->data.lpc.order = order; |
| 1011 | subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision; |
| 1012 | subframe->data.lpc.quantization_level = quantization; |
| 1013 | memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(int32)*FLAC__MAX_LPC_ORDER); |
| 1014 | for(i = 0; i < order; i++) |
| 1015 | subframe->data.lpc.warmup[i] = signal[i]; |
| 1016 | |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame^] | 1017 | return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN + FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN + (order * (qlp_coeff_precision + bits_per_sample)) + residual_bits; |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1018 | } |
| 1019 | |
| 1020 | unsigned encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned bits_per_sample, FLAC__Subframe *subframe) |
| 1021 | { |
| 1022 | subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM; |
| 1023 | |
| 1024 | subframe->data.verbatim.data = signal; |
| 1025 | |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame^] | 1026 | return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (blocksize * bits_per_sample); |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1027 | } |
| 1028 | |
| 1029 | unsigned encoder_find_best_partition_order_(const int32 residual[], uint32 abs_residual[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned max_partition_order, unsigned *best_partition_order, unsigned best_parameters[]) |
| 1030 | { |
| 1031 | unsigned residual_bits, best_residual_bits = 0; |
| 1032 | unsigned i, partition_order; |
| 1033 | unsigned best_parameters_index = 0, parameters[2][1 << FLAC__MAX_RICE_PARTITION_ORDER]; |
| 1034 | int32 r; |
| 1035 | |
| 1036 | /* compute the abs(residual) for use later */ |
| 1037 | for(i = 0; i < residual_samples; i++) { |
| 1038 | r = residual[i]; |
| 1039 | abs_residual[i] = (uint32)(r<0? -r : r); |
| 1040 | } |
| 1041 | |
| 1042 | for(partition_order = 0; partition_order <= max_partition_order; partition_order++) { |
Josh Coalson | 3b5f471 | 2001-03-21 22:53:43 +0000 | [diff] [blame] | 1043 | if(!encoder_set_partitioned_rice_(abs_residual, residual_samples, predictor_order, rice_parameter, partition_order, parameters[!best_parameters_index], &residual_bits)) { |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1044 | assert(best_residual_bits != 0); |
| 1045 | break; |
| 1046 | } |
| 1047 | if(best_residual_bits == 0 || residual_bits < best_residual_bits) { |
| 1048 | best_residual_bits = residual_bits; |
| 1049 | *best_partition_order = partition_order; |
| 1050 | best_parameters_index = !best_parameters_index; |
| 1051 | } |
| 1052 | } |
| 1053 | memcpy(best_parameters, parameters[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order))); |
| 1054 | |
| 1055 | return best_residual_bits; |
| 1056 | } |
| 1057 | |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1058 | #ifdef VARIABLE_RICE_BITS |
| 1059 | #undef VARIABLE_RICE_BITS |
| 1060 | #endif |
| 1061 | #define VARIABLE_RICE_BITS(value, parameter) ((value) >> (parameter)) |
| 1062 | |
Josh Coalson | 3b5f471 | 2001-03-21 22:53:43 +0000 | [diff] [blame] | 1063 | bool encoder_set_partitioned_rice_(const uint32 abs_residual[], const unsigned residual_samples, const unsigned predictor_order, const unsigned rice_parameter, const unsigned partition_order, unsigned parameters[], unsigned *bits) |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1064 | { |
| 1065 | unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN; |
| 1066 | |
| 1067 | if(partition_order == 0) { |
| 1068 | unsigned i; |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1069 | |
| 1070 | { |
| 1071 | #ifdef VARIABLE_RICE_BITS |
| 1072 | #ifdef SYMMETRIC_RICE |
| 1073 | bits_ += (2+rice_parameter) * residual_samples; |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1074 | #else |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1075 | const unsigned rice_parameter_estimate = rice_parameter-1; |
| 1076 | bits_ += (1+rice_parameter) * residual_samples; |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1077 | #endif |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1078 | #endif |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1079 | parameters[0] = rice_parameter; |
| 1080 | bits_ += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; |
| 1081 | for(i = 0; i < residual_samples; i++) { |
| 1082 | #ifdef VARIABLE_RICE_BITS |
| 1083 | #ifdef SYMMETRIC_RICE |
Josh Coalson | 3b5f471 | 2001-03-21 22:53:43 +0000 | [diff] [blame] | 1084 | bits_ += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter); |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1085 | #else |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1086 | bits_ += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate); |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1087 | #endif |
| 1088 | #else |
Josh Coalson | 3b5f471 | 2001-03-21 22:53:43 +0000 | [diff] [blame] | 1089 | bits_ += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE we will need to pass in residual[] instead of abs_residual[] */ |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1090 | #endif |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1091 | } |
| 1092 | } |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1093 | } |
| 1094 | else { |
| 1095 | unsigned i, j, k = 0, k_last = 0; |
| 1096 | unsigned mean, parameter, partition_samples; |
| 1097 | const unsigned max_parameter = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN) - 1; |
| 1098 | for(i = 0; i < (1u<<partition_order); i++) { |
| 1099 | partition_samples = (residual_samples+predictor_order) >> partition_order; |
| 1100 | if(i == 0) { |
| 1101 | if(partition_samples <= predictor_order) |
| 1102 | return false; |
| 1103 | else |
| 1104 | partition_samples -= predictor_order; |
| 1105 | } |
| 1106 | mean = partition_samples >> 1; |
| 1107 | for(j = 0; j < partition_samples; j++, k++) |
| 1108 | mean += abs_residual[k]; |
| 1109 | mean /= partition_samples; |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1110 | #ifdef SYMMETRIC_RICE |
| 1111 | /* calc parameter = floor(log2(mean)) */ |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1112 | parameter = 0; |
| 1113 | mean>>=1; |
| 1114 | while(mean) { |
| 1115 | parameter++; |
| 1116 | mean >>= 1; |
| 1117 | } |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1118 | #else |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1119 | /* calc parameter = floor(log2(mean)) + 1 */ |
| 1120 | parameter = 0; |
| 1121 | while(mean) { |
| 1122 | parameter++; |
| 1123 | mean >>= 1; |
| 1124 | } |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1125 | #endif |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1126 | if(parameter > max_parameter) |
| 1127 | parameter = max_parameter; |
| 1128 | parameters[i] = parameter; |
| 1129 | bits_ += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1130 | #ifdef VARIABLE_RICE_BITS |
| 1131 | #ifdef SYMMETRIC_RICE |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1132 | bits_ += (2+parameter) * partition_samples; |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1133 | #else |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1134 | bits_ += (1+parameter) * partition_samples; |
| 1135 | --parameter; |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1136 | #endif |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1137 | #endif |
| 1138 | for(j = k_last; j < k; j++) |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1139 | #ifdef VARIABLE_RICE_BITS |
| 1140 | #ifdef SYMMETRIC_RICE |
| 1141 | bits_ += VARIABLE_RICE_BITS(abs_residual[j], parameter); |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1142 | #else |
Josh Coalson | 352e0f6 | 2001-03-20 22:55:50 +0000 | [diff] [blame] | 1143 | bits_ += VARIABLE_RICE_BITS(abs_residual[j], parameter); |
Josh Coalson | b9433f9 | 2001-03-17 01:07:00 +0000 | [diff] [blame] | 1144 | #endif |
| 1145 | #else |
Josh Coalson | 3b5f471 | 2001-03-21 22:53:43 +0000 | [diff] [blame] | 1146 | bits_ += FLAC__bitbuffer_rice_bits(residual[j], parameter); /* NOTE we will need to pass in residual[] instead of abs_residual[] */ |
Josh Coalson | 94e02cd | 2001-01-25 10:41:06 +0000 | [diff] [blame] | 1147 | #endif |
| 1148 | k_last = k; |
| 1149 | } |
| 1150 | } |
| 1151 | |
| 1152 | *bits = bits_; |
| 1153 | return true; |
| 1154 | } |