Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 1 | # Stuff to parse AIFF-C and AIFF files. |
| 2 | # |
| 3 | # Unless explicitly stated otherwise, the description below is true |
| 4 | # both for AIFF-C files and AIFF files. |
| 5 | # |
| 6 | # An AIFF-C file has the following structure. |
| 7 | # |
| 8 | # +-----------------+ |
| 9 | # | FORM | |
| 10 | # +-----------------+ |
| 11 | # | <size> | |
| 12 | # +----+------------+ |
| 13 | # | | AIFC | |
| 14 | # | +------------+ |
| 15 | # | | <chunks> | |
| 16 | # | | . | |
| 17 | # | | . | |
| 18 | # | | . | |
| 19 | # +----+------------+ |
| 20 | # |
| 21 | # An AIFF file has the string "AIFF" instead of "AIFC". |
| 22 | # |
| 23 | # A chunk consists of an identifier (4 bytes) followed by a size (4 bytes, |
| 24 | # big endian order), followed by the data. The size field does not include |
| 25 | # the size of the 8 byte header. |
| 26 | # |
| 27 | # The following chunk types are recognized. |
| 28 | # |
| 29 | # FVER |
| 30 | # <version number of AIFF-C defining document> (AIFF-C only). |
| 31 | # MARK |
| 32 | # <# of markers> (2 bytes) |
| 33 | # list of markers: |
| 34 | # <marker ID> (2 bytes, must be > 0) |
| 35 | # <position> (4 bytes) |
| 36 | # <marker name> ("pstring") |
| 37 | # COMM |
| 38 | # <# of channels> (2 bytes) |
| 39 | # <# of sound frames> (4 bytes) |
| 40 | # <size of the samples> (2 bytes) |
| 41 | # <sampling frequency> (10 bytes, IEEE 80-bit extended |
| 42 | # floating point) |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 43 | # in AIFF-C files only: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 44 | # <compression type> (4 bytes) |
| 45 | # <human-readable version of compression type> ("pstring") |
| 46 | # SSND |
| 47 | # <offset> (4 bytes, not used by this program) |
| 48 | # <blocksize> (4 bytes, not used by this program) |
| 49 | # <sound data> |
| 50 | # |
| 51 | # A pstring consists of 1 byte length, a string of characters, and 0 or 1 |
| 52 | # byte pad to make the total length even. |
| 53 | # |
| 54 | # Usage. |
| 55 | # |
| 56 | # Reading AIFF files: |
| 57 | # f = aifc.open(file, 'r') |
Sjoerd Mullender | 2a45141 | 1993-12-20 09:36:01 +0000 | [diff] [blame] | 58 | # where file is either the name of a file or an open file pointer. |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 59 | # The open file pointer must have methods read(), seek(), and close(). |
| 60 | # In some types of audio files, if the setpos() method is not used, |
| 61 | # the seek() method is not necessary. |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 62 | # |
| 63 | # This returns an instance of a class with the following public methods: |
| 64 | # getnchannels() -- returns number of audio channels (1 for |
| 65 | # mono, 2 for stereo) |
| 66 | # getsampwidth() -- returns sample width in bytes |
| 67 | # getframerate() -- returns sampling frequency |
| 68 | # getnframes() -- returns number of audio frames |
| 69 | # getcomptype() -- returns compression type ('NONE' for AIFF files) |
| 70 | # getcompname() -- returns human-readable version of |
| 71 | # compression type ('not compressed' for AIFF files) |
| 72 | # getparams() -- returns a tuple consisting of all of the |
| 73 | # above in the above order |
| 74 | # getmarkers() -- get the list of marks in the audio file or None |
| 75 | # if there are no marks |
| 76 | # getmark(id) -- get mark with the specified id (raises an error |
| 77 | # if the mark does not exist) |
| 78 | # readframes(n) -- returns at most n frames of audio |
| 79 | # rewind() -- rewind to the beginning of the audio stream |
| 80 | # setpos(pos) -- seek to the specified position |
| 81 | # tell() -- return the current position |
Guido van Rossum | 17ed1ae | 1993-06-01 13:21:04 +0000 | [diff] [blame] | 82 | # close() -- close the instance (make it unusable) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 83 | # The position returned by tell(), the position given to setpos() and |
| 84 | # the position of marks are all compatible and have nothing to do with |
| 85 | # the actual postion in the file. |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 86 | # The close() method is called automatically when the class instance |
| 87 | # is destroyed. |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 88 | # |
| 89 | # Writing AIFF files: |
| 90 | # f = aifc.open(file, 'w') |
Sjoerd Mullender | 2a45141 | 1993-12-20 09:36:01 +0000 | [diff] [blame] | 91 | # where file is either the name of a file or an open file pointer. |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 92 | # The open file pointer must have methods write(), tell(), seek(), and |
| 93 | # close(). |
| 94 | # |
| 95 | # This returns an instance of a class with the following public methods: |
| 96 | # aiff() -- create an AIFF file (AIFF-C default) |
| 97 | # aifc() -- create an AIFF-C file |
| 98 | # setnchannels(n) -- set the number of channels |
| 99 | # setsampwidth(n) -- set the sample width |
| 100 | # setframerate(n) -- set the frame rate |
| 101 | # setnframes(n) -- set the number of frames |
| 102 | # setcomptype(type, name) |
| 103 | # -- set the compression type and the |
| 104 | # human-readable compression type |
| 105 | # setparams(nchannels, sampwidth, framerate, nframes, comptype, compname) |
| 106 | # -- set all parameters at once |
| 107 | # setmark(id, pos, name) |
| 108 | # -- add specified mark to the list of marks |
| 109 | # tell() -- return current position in output file (useful |
| 110 | # in combination with setmark()) |
| 111 | # writeframesraw(data) |
| 112 | # -- write audio frames without pathing up the |
| 113 | # file header |
| 114 | # writeframes(data) |
| 115 | # -- write audio frames and patch up the file header |
| 116 | # close() -- patch up the file header and close the |
| 117 | # output file |
| 118 | # You should set the parameters before the first writeframesraw or |
| 119 | # writeframes. The total number of frames does not need to be set, |
| 120 | # but when it is set to the correct value, the header does not have to |
| 121 | # be patched up. |
| 122 | # It is best to first set all parameters, perhaps possibly the |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 123 | # compression type, and then write audio frames using writeframesraw. |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 124 | # When all frames have been written, either call writeframes('') or |
| 125 | # close() to patch up the sizes in the header. |
| 126 | # Marks can be added anytime. If there are any marks, ypu must call |
| 127 | # close() after all frames have been written. |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 128 | # The close() method is called automatically when the class instance |
| 129 | # is destroyed. |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 130 | # |
| 131 | # When a file is opened with the extension '.aiff', an AIFF file is |
| 132 | # written, otherwise an AIFF-C file is written. This default can be |
| 133 | # changed by calling aiff() or aifc() before the first writeframes or |
| 134 | # writeframesraw. |
| 135 | |
Guido van Rossum | 3db6ebc | 1994-01-28 09:59:35 +0000 | [diff] [blame] | 136 | import __builtin__ |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 137 | try: |
| 138 | import CL |
| 139 | except ImportError: |
| 140 | pass |
| 141 | |
| 142 | Error = 'aifc.Error' |
| 143 | |
| 144 | _AIFC_version = 0xA2805140 # Version 1 of AIFF-C |
| 145 | |
| 146 | _skiplist = 'COMT', 'INST', 'MIDI', 'AESD', \ |
| 147 | 'APPL', 'NAME', 'AUTH', '(c) ', 'ANNO' |
| 148 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 149 | def _read_long(file): |
| 150 | x = 0L |
| 151 | for i in range(4): |
| 152 | byte = file.read(1) |
| 153 | if byte == '': |
| 154 | raise EOFError |
| 155 | x = x*256 + ord(byte) |
| 156 | if x >= 0x80000000L: |
| 157 | x = x - 0x100000000L |
| 158 | return int(x) |
| 159 | |
| 160 | def _read_ulong(file): |
| 161 | x = 0L |
| 162 | for i in range(4): |
| 163 | byte = file.read(1) |
| 164 | if byte == '': |
| 165 | raise EOFError |
| 166 | x = x*256 + ord(byte) |
| 167 | return x |
| 168 | |
| 169 | def _read_short(file): |
| 170 | x = 0 |
| 171 | for i in range(2): |
| 172 | byte = file.read(1) |
| 173 | if byte == '': |
| 174 | raise EOFError |
| 175 | x = x*256 + ord(byte) |
| 176 | if x >= 0x8000: |
| 177 | x = x - 0x10000 |
| 178 | return x |
| 179 | |
| 180 | def _read_string(file): |
| 181 | length = ord(file.read(1)) |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 182 | if length == 0: |
| 183 | data = '' |
| 184 | else: |
| 185 | data = file.read(length) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 186 | if length & 1 == 0: |
| 187 | dummy = file.read(1) |
| 188 | return data |
| 189 | |
| 190 | _HUGE_VAL = 1.79769313486231e+308 # See <limits.h> |
| 191 | |
| 192 | def _read_float(f): # 10 bytes |
| 193 | import math |
| 194 | expon = _read_short(f) # 2 bytes |
| 195 | sign = 1 |
| 196 | if expon < 0: |
| 197 | sign = -1 |
| 198 | expon = expon + 0x8000 |
| 199 | himant = _read_ulong(f) # 4 bytes |
| 200 | lomant = _read_ulong(f) # 4 bytes |
| 201 | if expon == himant == lomant == 0: |
| 202 | f = 0.0 |
| 203 | elif expon == 0x7FFF: |
| 204 | f = _HUGE_VAL |
| 205 | else: |
| 206 | expon = expon - 16383 |
| 207 | f = (himant * 0x100000000L + lomant) * pow(2.0, expon - 63) |
| 208 | return sign * f |
| 209 | |
| 210 | def _write_short(f, x): |
| 211 | d, m = divmod(x, 256) |
| 212 | f.write(chr(d)) |
| 213 | f.write(chr(m)) |
| 214 | |
| 215 | def _write_long(f, x): |
| 216 | if x < 0: |
| 217 | x = x + 0x100000000L |
| 218 | data = [] |
| 219 | for i in range(4): |
| 220 | d, m = divmod(x, 256) |
| 221 | data.insert(0, m) |
| 222 | x = d |
| 223 | for i in range(4): |
| 224 | f.write(chr(int(data[i]))) |
| 225 | |
| 226 | def _write_string(f, s): |
| 227 | f.write(chr(len(s))) |
| 228 | f.write(s) |
| 229 | if len(s) & 1 == 0: |
| 230 | f.write(chr(0)) |
| 231 | |
| 232 | def _write_float(f, x): |
| 233 | import math |
| 234 | if x < 0: |
| 235 | sign = 0x8000 |
| 236 | x = x * -1 |
| 237 | else: |
| 238 | sign = 0 |
| 239 | if x == 0: |
| 240 | expon = 0 |
| 241 | himant = 0 |
| 242 | lomant = 0 |
| 243 | else: |
| 244 | fmant, expon = math.frexp(x) |
| 245 | if expon > 16384 or fmant >= 1: # Infinity or NaN |
| 246 | expon = sign|0x7FFF |
| 247 | himant = 0 |
| 248 | lomant = 0 |
| 249 | else: # Finite |
| 250 | expon = expon + 16382 |
| 251 | if expon < 0: # denormalized |
| 252 | fmant = math.ldexp(fmant, expon) |
| 253 | expon = 0 |
| 254 | expon = expon | sign |
| 255 | fmant = math.ldexp(fmant, 32) |
| 256 | fsmant = math.floor(fmant) |
| 257 | himant = long(fsmant) |
| 258 | fmant = math.ldexp(fmant - fsmant, 32) |
| 259 | fsmant = math.floor(fmant) |
| 260 | lomant = long(fsmant) |
| 261 | _write_short(f, expon) |
| 262 | _write_long(f, himant) |
| 263 | _write_long(f, lomant) |
| 264 | |
Guido van Rossum | d316607 | 1993-05-24 14:16:22 +0000 | [diff] [blame] | 265 | class Chunk: |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 266 | def __init__(self, file): |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 267 | self.file = file |
| 268 | self.chunkname = self.file.read(4) |
| 269 | if len(self.chunkname) < 4: |
| 270 | raise EOFError |
| 271 | self.chunksize = _read_long(self.file) |
| 272 | self.size_read = 0 |
| 273 | self.offset = self.file.tell() |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 274 | |
| 275 | def rewind(self): |
| 276 | self.file.seek(self.offset, 0) |
| 277 | self.size_read = 0 |
| 278 | |
| 279 | def setpos(self, pos): |
| 280 | if pos < 0 or pos > self.chunksize: |
| 281 | raise RuntimeError |
| 282 | self.file.seek(self.offset + pos, 0) |
| 283 | self.size_read = pos |
| 284 | |
| 285 | def read(self, length): |
| 286 | if self.size_read >= self.chunksize: |
| 287 | return '' |
| 288 | if length > self.chunksize - self.size_read: |
| 289 | length = self.chunksize - self.size_read |
| 290 | data = self.file.read(length) |
| 291 | self.size_read = self.size_read + len(data) |
| 292 | return data |
| 293 | |
| 294 | def skip(self): |
| 295 | try: |
| 296 | self.file.seek(self.chunksize - self.size_read, 1) |
| 297 | except RuntimeError: |
| 298 | while self.size_read < self.chunksize: |
| 299 | dummy = self.read(8192) |
| 300 | if not dummy: |
| 301 | raise EOFError |
| 302 | if self.chunksize & 1: |
| 303 | dummy = self.read(1) |
| 304 | |
Guido van Rossum | d316607 | 1993-05-24 14:16:22 +0000 | [diff] [blame] | 305 | class Aifc_read: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 306 | # Variables used in this class: |
| 307 | # |
| 308 | # These variables are available to the user though appropriate |
| 309 | # methods of this class: |
| 310 | # _file -- the open file with methods read(), close(), and seek() |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 311 | # set through the __init__() method |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 312 | # _nchannels -- the number of audio channels |
| 313 | # available through the getnchannels() method |
| 314 | # _nframes -- the number of audio frames |
| 315 | # available through the getnframes() method |
| 316 | # _sampwidth -- the number of bytes per audio sample |
| 317 | # available through the getsampwidth() method |
| 318 | # _framerate -- the sampling frequency |
| 319 | # available through the getframerate() method |
| 320 | # _comptype -- the AIFF-C compression type ('NONE' if AIFF) |
| 321 | # available through the getcomptype() method |
| 322 | # _compname -- the human-readable AIFF-C compression type |
| 323 | # available through the getcomptype() method |
| 324 | # _markers -- the marks in the audio file |
| 325 | # available through the getmarkers() and getmark() |
| 326 | # methods |
| 327 | # _soundpos -- the position in the audio stream |
| 328 | # available through the tell() method, set through the |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 329 | # setpos() method |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 330 | # |
| 331 | # These variables are used internally only: |
| 332 | # _version -- the AIFF-C version number |
| 333 | # _decomp -- the decompressor from builtin module cl |
| 334 | # _comm_chunk_read -- 1 iff the COMM chunk has been read |
| 335 | # _aifc -- 1 iff reading an AIFF-C file |
| 336 | # _ssnd_seek_needed -- 1 iff positioned correctly in audio |
| 337 | # file for readframes() |
| 338 | # _ssnd_chunk -- instantiation of a chunk class for the SSND chunk |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 339 | # _framesize -- size of one frame in the file |
Sjoerd Mullender | 2a45141 | 1993-12-20 09:36:01 +0000 | [diff] [blame] | 340 | |
Guido van Rossum | 3e7a697 | 1995-08-10 19:23:37 +0000 | [diff] [blame] | 341 | if 0: access _file, _nchannels, _nframes, _sampwidth, _framerate, \ |
Sjoerd Mullender | 2a45141 | 1993-12-20 09:36:01 +0000 | [diff] [blame] | 342 | _comptype, _compname, _markers, _soundpos, _version, \ |
| 343 | _decomp, _comm_chunk_read, __aifc, _ssnd_seek_needed, \ |
| 344 | _ssnd_chunk, _framesize: private |
| 345 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 346 | def initfp(self, file): |
| 347 | self._file = file |
| 348 | self._version = 0 |
| 349 | self._decomp = None |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 350 | self._convert = None |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 351 | self._markers = [] |
| 352 | self._soundpos = 0 |
| 353 | form = self._file.read(4) |
| 354 | if form != 'FORM': |
| 355 | raise Error, 'file does not start with FORM id' |
| 356 | formlength = _read_long(self._file) |
| 357 | if formlength <= 0: |
| 358 | raise Error, 'invalid FORM chunk data size' |
| 359 | formdata = self._file.read(4) |
| 360 | formlength = formlength - 4 |
| 361 | if formdata == 'AIFF': |
| 362 | self._aifc = 0 |
| 363 | elif formdata == 'AIFC': |
| 364 | self._aifc = 1 |
| 365 | else: |
| 366 | raise Error, 'not an AIFF or AIFF-C file' |
| 367 | self._comm_chunk_read = 0 |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 368 | while formlength > 0: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 369 | self._ssnd_seek_needed = 1 |
Sjoerd Mullender | 8d733a0 | 1993-01-29 12:01:00 +0000 | [diff] [blame] | 370 | #DEBUG: SGI's soundfiler has a bug. There should |
| 371 | # be no need to check for EOF here. |
| 372 | try: |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 373 | chunk = Chunk(self._file) |
Sjoerd Mullender | 8d733a0 | 1993-01-29 12:01:00 +0000 | [diff] [blame] | 374 | except EOFError: |
| 375 | if formlength == 8: |
| 376 | print 'Warning: FORM chunk size too large' |
| 377 | formlength = 0 |
| 378 | break |
| 379 | raise EOFError # different error, raise exception |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 380 | if chunk.chunkname == 'COMM': |
| 381 | self._read_comm_chunk(chunk) |
| 382 | self._comm_chunk_read = 1 |
| 383 | elif chunk.chunkname == 'SSND': |
| 384 | self._ssnd_chunk = chunk |
| 385 | dummy = chunk.read(8) |
| 386 | self._ssnd_seek_needed = 0 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 387 | elif chunk.chunkname == 'FVER': |
| 388 | self._version = _read_long(chunk) |
| 389 | elif chunk.chunkname == 'MARK': |
| 390 | self._readmark(chunk) |
| 391 | elif chunk.chunkname in _skiplist: |
| 392 | pass |
| 393 | else: |
| 394 | raise Error, 'unrecognized chunk type '+chunk.chunkname |
Sjoerd Mullender | 4150ede | 1993-08-26 14:12:07 +0000 | [diff] [blame] | 395 | formlength = formlength - 8 - chunk.chunksize |
| 396 | if chunk.chunksize & 1: |
| 397 | formlength = formlength - 1 |
Sjoerd Mullender | 93f0740 | 1993-01-26 09:24:37 +0000 | [diff] [blame] | 398 | if formlength > 0: |
| 399 | chunk.skip() |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 400 | if not self._comm_chunk_read or not self._ssnd_chunk: |
| 401 | raise Error, 'COMM chunk and/or SSND chunk missing' |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 402 | if self._aifc and self._decomp: |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 403 | params = [CL.ORIGINAL_FORMAT, 0, |
| 404 | CL.BITS_PER_COMPONENT, self._sampwidth * 8, |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 405 | CL.FRAME_RATE, self._framerate] |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 406 | if self._nchannels == 1: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 407 | params[1] = CL.MONO |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 408 | elif self._nchannels == 2: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 409 | params[1] = CL.STEREO_INTERLEAVED |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 410 | else: |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 411 | raise Error, 'cannot compress more than 2 channels' |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 412 | self._decomp.SetParams(params) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 413 | |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 414 | def __init__(self, f): |
| 415 | if type(f) == type(''): |
Guido van Rossum | e174c15 | 1994-09-16 10:55:53 +0000 | [diff] [blame] | 416 | f = __builtin__.open(f, 'rb') |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 417 | # else, assume it is an open file object already |
| 418 | self.initfp(f) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 419 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 420 | def __del__(self): |
| 421 | if self._file: |
| 422 | self.close() |
| 423 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 424 | # |
| 425 | # User visible methods. |
| 426 | # |
| 427 | def getfp(self): |
| 428 | return self._file |
| 429 | |
| 430 | def rewind(self): |
| 431 | self._ssnd_seek_needed = 1 |
| 432 | self._soundpos = 0 |
| 433 | |
| 434 | def close(self): |
| 435 | if self._decomp: |
| 436 | self._decomp.CloseDecompressor() |
| 437 | self._decomp = None |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 438 | self._file = None |
| 439 | |
| 440 | def tell(self): |
| 441 | return self._soundpos |
| 442 | |
| 443 | def getnchannels(self): |
| 444 | return self._nchannels |
| 445 | |
| 446 | def getnframes(self): |
| 447 | return self._nframes |
| 448 | |
| 449 | def getsampwidth(self): |
| 450 | return self._sampwidth |
| 451 | |
| 452 | def getframerate(self): |
| 453 | return self._framerate |
| 454 | |
| 455 | def getcomptype(self): |
| 456 | return self._comptype |
| 457 | |
| 458 | def getcompname(self): |
| 459 | return self._compname |
| 460 | |
| 461 | ## def getversion(self): |
| 462 | ## return self._version |
| 463 | |
| 464 | def getparams(self): |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 465 | return self.getnchannels(), self.getsampwidth(), \ |
| 466 | self.getframerate(), self.getnframes(), \ |
| 467 | self.getcomptype(), self.getcompname() |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 468 | |
| 469 | def getmarkers(self): |
| 470 | if len(self._markers) == 0: |
| 471 | return None |
| 472 | return self._markers |
| 473 | |
| 474 | def getmark(self, id): |
| 475 | for marker in self._markers: |
| 476 | if id == marker[0]: |
| 477 | return marker |
| 478 | raise Error, 'marker ' + `id` + ' does not exist' |
| 479 | |
| 480 | def setpos(self, pos): |
| 481 | if pos < 0 or pos > self._nframes: |
| 482 | raise Error, 'position not in range' |
| 483 | self._soundpos = pos |
| 484 | self._ssnd_seek_needed = 1 |
| 485 | |
| 486 | def readframes(self, nframes): |
| 487 | if self._ssnd_seek_needed: |
| 488 | self._ssnd_chunk.rewind() |
| 489 | dummy = self._ssnd_chunk.read(8) |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 490 | pos = self._soundpos * self._framesize |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 491 | if pos: |
| 492 | self._ssnd_chunk.setpos(pos + 8) |
| 493 | self._ssnd_seek_needed = 0 |
Sjoerd Mullender | 8d733a0 | 1993-01-29 12:01:00 +0000 | [diff] [blame] | 494 | if nframes == 0: |
| 495 | return '' |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 496 | data = self._ssnd_chunk.read(nframes * self._framesize) |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 497 | if self._convert and data: |
| 498 | data = self._convert(data) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 499 | self._soundpos = self._soundpos + len(data) / (self._nchannels * self._sampwidth) |
| 500 | return data |
| 501 | |
| 502 | # |
| 503 | # Internal methods. |
| 504 | # |
Guido van Rossum | 3e7a697 | 1995-08-10 19:23:37 +0000 | [diff] [blame] | 505 | if 0: access *: private |
Sjoerd Mullender | 2a45141 | 1993-12-20 09:36:01 +0000 | [diff] [blame] | 506 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 507 | def _decomp_data(self, data): |
| 508 | dummy = self._decomp.SetParam(CL.FRAME_BUFFER_SIZE, |
| 509 | len(data) * 2) |
| 510 | return self._decomp.Decompress(len(data) / self._nchannels, |
| 511 | data) |
| 512 | |
| 513 | def _ulaw2lin(self, data): |
| 514 | import audioop |
| 515 | return audioop.ulaw2lin(data, 2) |
| 516 | |
Sjoerd Mullender | 1f05754 | 1994-09-06 16:17:51 +0000 | [diff] [blame] | 517 | def _adpcm2lin(self, data): |
| 518 | import audioop |
| 519 | if not hasattr(self, '_adpcmstate'): |
| 520 | # first time |
| 521 | self._adpcmstate = None |
| 522 | data, self._adpcmstate = audioop.adpcm2lin(data, 2, |
| 523 | self._adpcmstate) |
| 524 | return data |
| 525 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 526 | def _read_comm_chunk(self, chunk): |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 527 | self._nchannels = _read_short(chunk) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 528 | self._nframes = _read_long(chunk) |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 529 | self._sampwidth = (_read_short(chunk) + 7) / 8 |
Sjoerd Mullender | ffe9490 | 1994-01-28 09:56:05 +0000 | [diff] [blame] | 530 | self._framerate = int(_read_float(chunk)) |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 531 | self._framesize = self._nchannels * self._sampwidth |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 532 | if self._aifc: |
| 533 | #DEBUG: SGI's soundeditor produces a bad size :-( |
| 534 | kludge = 0 |
| 535 | if chunk.chunksize == 18: |
| 536 | kludge = 1 |
| 537 | print 'Warning: bad COMM chunk size' |
| 538 | chunk.chunksize = 23 |
| 539 | #DEBUG end |
| 540 | self._comptype = chunk.read(4) |
| 541 | #DEBUG start |
| 542 | if kludge: |
| 543 | length = ord(chunk.file.read(1)) |
| 544 | if length & 1 == 0: |
| 545 | length = length + 1 |
| 546 | chunk.chunksize = chunk.chunksize + length |
| 547 | chunk.file.seek(-1, 1) |
| 548 | #DEBUG end |
| 549 | self._compname = _read_string(chunk) |
| 550 | if self._comptype != 'NONE': |
Sjoerd Mullender | 1f05754 | 1994-09-06 16:17:51 +0000 | [diff] [blame] | 551 | if self._comptype == 'G722': |
| 552 | try: |
| 553 | import audioop |
| 554 | except ImportError: |
| 555 | pass |
| 556 | else: |
| 557 | self._convert = self._adpcm2lin |
| 558 | self._framesize = self._framesize / 4 |
| 559 | return |
| 560 | # for ULAW and ALAW try Compression Library |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 561 | try: |
| 562 | import cl, CL |
| 563 | except ImportError: |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 564 | if self._comptype == 'ULAW': |
| 565 | try: |
| 566 | import audioop |
| 567 | self._convert = self._ulaw2lin |
| 568 | self._framesize = self._framesize / 2 |
| 569 | return |
| 570 | except ImportError: |
| 571 | pass |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 572 | raise Error, 'cannot read compressed AIFF-C files' |
| 573 | if self._comptype == 'ULAW': |
| 574 | scheme = CL.G711_ULAW |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 575 | self._framesize = self._framesize / 2 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 576 | elif self._comptype == 'ALAW': |
| 577 | scheme = CL.G711_ALAW |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 578 | self._framesize = self._framesize / 2 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 579 | else: |
| 580 | raise Error, 'unsupported compression type' |
| 581 | self._decomp = cl.OpenDecompressor(scheme) |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 582 | self._convert = self._decomp_data |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 583 | else: |
| 584 | self._comptype = 'NONE' |
| 585 | self._compname = 'not compressed' |
| 586 | |
| 587 | def _readmark(self, chunk): |
| 588 | nmarkers = _read_short(chunk) |
Guido van Rossum | 9b3bc71 | 1993-06-20 21:02:22 +0000 | [diff] [blame] | 589 | # Some files appear to contain invalid counts. |
| 590 | # Cope with this by testing for EOF. |
| 591 | try: |
| 592 | for i in range(nmarkers): |
| 593 | id = _read_short(chunk) |
| 594 | pos = _read_long(chunk) |
| 595 | name = _read_string(chunk) |
Sjoerd Mullender | ebea896 | 1994-10-03 10:21:06 +0000 | [diff] [blame] | 596 | if pos or name: |
| 597 | # some files appear to have |
| 598 | # dummy markers consisting of |
| 599 | # a position 0 and name '' |
| 600 | self._markers.append((id, pos, name)) |
Guido van Rossum | 9b3bc71 | 1993-06-20 21:02:22 +0000 | [diff] [blame] | 601 | except EOFError: |
| 602 | print 'Warning: MARK chunk contains only', |
| 603 | print len(self._markers), |
| 604 | if len(self._markers) == 1: print 'marker', |
| 605 | else: print 'markers', |
| 606 | print 'instead of', nmarkers |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 607 | |
Guido van Rossum | d316607 | 1993-05-24 14:16:22 +0000 | [diff] [blame] | 608 | class Aifc_write: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 609 | # Variables used in this class: |
| 610 | # |
| 611 | # These variables are user settable through appropriate methods |
| 612 | # of this class: |
| 613 | # _file -- the open file with methods write(), close(), tell(), seek() |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 614 | # set through the __init__() method |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 615 | # _comptype -- the AIFF-C compression type ('NONE' in AIFF) |
| 616 | # set through the setcomptype() or setparams() method |
| 617 | # _compname -- the human-readable AIFF-C compression type |
| 618 | # set through the setcomptype() or setparams() method |
| 619 | # _nchannels -- the number of audio channels |
| 620 | # set through the setnchannels() or setparams() method |
| 621 | # _sampwidth -- the number of bytes per audio sample |
| 622 | # set through the setsampwidth() or setparams() method |
| 623 | # _framerate -- the sampling frequency |
| 624 | # set through the setframerate() or setparams() method |
| 625 | # _nframes -- the number of audio frames written to the header |
| 626 | # set through the setnframes() or setparams() method |
| 627 | # _aifc -- whether we're writing an AIFF-C file or an AIFF file |
| 628 | # set through the aifc() method, reset through the |
| 629 | # aiff() method |
| 630 | # |
| 631 | # These variables are used internally only: |
| 632 | # _version -- the AIFF-C version number |
| 633 | # _comp -- the compressor from builtin module cl |
| 634 | # _nframeswritten -- the number of audio frames actually written |
| 635 | # _datalength -- the size of the audio samples written to the header |
| 636 | # _datawritten -- the size of the audio samples actually written |
| 637 | |
Guido van Rossum | 3e7a697 | 1995-08-10 19:23:37 +0000 | [diff] [blame] | 638 | if 0: access _file, _comptype, _compname, _nchannels, _sampwidth, \ |
Sjoerd Mullender | 2a45141 | 1993-12-20 09:36:01 +0000 | [diff] [blame] | 639 | _framerate, _nframes, _aifc, _version, _comp, \ |
| 640 | _nframeswritten, _datalength, _datawritten: private |
| 641 | |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 642 | def __init__(self, f): |
| 643 | if type(f) == type(''): |
Guido van Rossum | 6ed9df2 | 1993-12-17 16:43:43 +0000 | [diff] [blame] | 644 | filename = f |
Guido van Rossum | e174c15 | 1994-09-16 10:55:53 +0000 | [diff] [blame] | 645 | f = __builtin__.open(f, 'wb') |
Guido van Rossum | 6ed9df2 | 1993-12-17 16:43:43 +0000 | [diff] [blame] | 646 | else: |
Sjoerd Mullender | 2a45141 | 1993-12-20 09:36:01 +0000 | [diff] [blame] | 647 | # else, assume it is an open file object already |
Guido van Rossum | 6ed9df2 | 1993-12-17 16:43:43 +0000 | [diff] [blame] | 648 | filename = '???' |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 649 | self.initfp(f) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 650 | if filename[-5:] == '.aiff': |
| 651 | self._aifc = 0 |
| 652 | else: |
| 653 | self._aifc = 1 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 654 | |
| 655 | def initfp(self, file): |
| 656 | self._file = file |
| 657 | self._version = _AIFC_version |
| 658 | self._comptype = 'NONE' |
| 659 | self._compname = 'not compressed' |
| 660 | self._comp = None |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 661 | self._convert = None |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 662 | self._nchannels = 0 |
| 663 | self._sampwidth = 0 |
| 664 | self._framerate = 0 |
| 665 | self._nframes = 0 |
| 666 | self._nframeswritten = 0 |
| 667 | self._datawritten = 0 |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 668 | self._datalength = 0 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 669 | self._markers = [] |
| 670 | self._marklength = 0 |
| 671 | self._aifc = 1 # AIFF-C is default |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 672 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 673 | def __del__(self): |
| 674 | if self._file: |
| 675 | self.close() |
| 676 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 677 | # |
| 678 | # User visible methods. |
| 679 | # |
| 680 | def aiff(self): |
| 681 | if self._nframeswritten: |
| 682 | raise Error, 'cannot change parameters after starting to write' |
| 683 | self._aifc = 0 |
| 684 | |
| 685 | def aifc(self): |
| 686 | if self._nframeswritten: |
| 687 | raise Error, 'cannot change parameters after starting to write' |
| 688 | self._aifc = 1 |
| 689 | |
| 690 | def setnchannels(self, nchannels): |
| 691 | if self._nframeswritten: |
| 692 | raise Error, 'cannot change parameters after starting to write' |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 693 | if nchannels < 1: |
| 694 | raise Error, 'bad # of channels' |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 695 | self._nchannels = nchannels |
| 696 | |
| 697 | def getnchannels(self): |
| 698 | if not self._nchannels: |
| 699 | raise Error, 'number of channels not set' |
| 700 | return self._nchannels |
| 701 | |
| 702 | def setsampwidth(self, sampwidth): |
| 703 | if self._nframeswritten: |
| 704 | raise Error, 'cannot change parameters after starting to write' |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 705 | if sampwidth < 1 or sampwidth > 4: |
| 706 | raise Error, 'bad sample width' |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 707 | self._sampwidth = sampwidth |
| 708 | |
| 709 | def getsampwidth(self): |
| 710 | if not self._sampwidth: |
| 711 | raise Error, 'sample width not set' |
| 712 | return self._sampwidth |
| 713 | |
| 714 | def setframerate(self, framerate): |
| 715 | if self._nframeswritten: |
| 716 | raise Error, 'cannot change parameters after starting to write' |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 717 | if framerate <= 0: |
| 718 | raise Error, 'bad frame rate' |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 719 | self._framerate = framerate |
| 720 | |
| 721 | def getframerate(self): |
| 722 | if not self._framerate: |
| 723 | raise Error, 'frame rate not set' |
| 724 | return self._framerate |
| 725 | |
| 726 | def setnframes(self, nframes): |
| 727 | if self._nframeswritten: |
| 728 | raise Error, 'cannot change parameters after starting to write' |
| 729 | self._nframes = nframes |
| 730 | |
| 731 | def getnframes(self): |
| 732 | return self._nframeswritten |
| 733 | |
| 734 | def setcomptype(self, comptype, compname): |
| 735 | if self._nframeswritten: |
| 736 | raise Error, 'cannot change parameters after starting to write' |
Sjoerd Mullender | 1f05754 | 1994-09-06 16:17:51 +0000 | [diff] [blame] | 737 | if comptype not in ('NONE', 'ULAW', 'ALAW', 'G722'): |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 738 | raise Error, 'unsupported compression type' |
| 739 | self._comptype = comptype |
| 740 | self._compname = compname |
| 741 | |
| 742 | def getcomptype(self): |
| 743 | return self._comptype |
| 744 | |
| 745 | def getcompname(self): |
| 746 | return self._compname |
| 747 | |
| 748 | ## def setversion(self, version): |
| 749 | ## if self._nframeswritten: |
| 750 | ## raise Error, 'cannot change parameters after starting to write' |
| 751 | ## self._version = version |
| 752 | |
| 753 | def setparams(self, (nchannels, sampwidth, framerate, nframes, comptype, compname)): |
| 754 | if self._nframeswritten: |
| 755 | raise Error, 'cannot change parameters after starting to write' |
Sjoerd Mullender | 1f05754 | 1994-09-06 16:17:51 +0000 | [diff] [blame] | 756 | if comptype not in ('NONE', 'ULAW', 'ALAW', 'G722'): |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 757 | raise Error, 'unsupported compression type' |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 758 | self.setnchannels(nchannels) |
| 759 | self.setsampwidth(sampwidth) |
| 760 | self.setframerate(framerate) |
| 761 | self.setnframes(nframes) |
| 762 | self.setcomptype(comptype, compname) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 763 | |
| 764 | def getparams(self): |
| 765 | if not self._nchannels or not self._sampwidth or not self._framerate: |
| 766 | raise Error, 'not all parameters set' |
| 767 | return self._nchannels, self._sampwidth, self._framerate, \ |
| 768 | self._nframes, self._comptype, self._compname |
| 769 | |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 770 | def setmark(self, id, pos, name): |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 771 | if id <= 0: |
| 772 | raise Error, 'marker ID must be > 0' |
| 773 | if pos < 0: |
| 774 | raise Error, 'marker position must be >= 0' |
| 775 | if type(name) != type(''): |
| 776 | raise Error, 'marker name must be a string' |
| 777 | for i in range(len(self._markers)): |
| 778 | if id == self._markers[i][0]: |
| 779 | self._markers[i] = id, pos, name |
| 780 | return |
| 781 | self._markers.append((id, pos, name)) |
| 782 | |
| 783 | def getmark(self, id): |
| 784 | for marker in self._markers: |
| 785 | if id == marker[0]: |
| 786 | return marker |
| 787 | raise Error, 'marker ' + `id` + ' does not exist' |
| 788 | |
| 789 | def getmarkers(self): |
| 790 | if len(self._markers) == 0: |
| 791 | return None |
| 792 | return self._markers |
| 793 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 794 | def tell(self): |
| 795 | return self._nframeswritten |
| 796 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 797 | def writeframesraw(self, data): |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 798 | self._ensure_header_written(len(data)) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 799 | nframes = len(data) / (self._sampwidth * self._nchannels) |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 800 | if self._convert: |
| 801 | data = self._convert(data) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 802 | self._file.write(data) |
| 803 | self._nframeswritten = self._nframeswritten + nframes |
| 804 | self._datawritten = self._datawritten + len(data) |
| 805 | |
| 806 | def writeframes(self, data): |
| 807 | self.writeframesraw(data) |
| 808 | if self._nframeswritten != self._nframes or \ |
| 809 | self._datalength != self._datawritten: |
| 810 | self._patchheader() |
| 811 | |
| 812 | def close(self): |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 813 | self._ensure_header_written(0) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 814 | if self._datawritten & 1: |
| 815 | # quick pad to even size |
| 816 | self._file.write(chr(0)) |
| 817 | self._datawritten = self._datawritten + 1 |
| 818 | self._writemarkers() |
| 819 | if self._nframeswritten != self._nframes or \ |
| 820 | self._datalength != self._datawritten or \ |
| 821 | self._marklength: |
| 822 | self._patchheader() |
| 823 | if self._comp: |
| 824 | self._comp.CloseCompressor() |
| 825 | self._comp = None |
Sjoerd Mullender | feaa7d2 | 1993-12-16 13:56:34 +0000 | [diff] [blame] | 826 | self._file.flush() |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 827 | self._file = None |
| 828 | |
| 829 | # |
| 830 | # Internal methods. |
| 831 | # |
Guido van Rossum | 3e7a697 | 1995-08-10 19:23:37 +0000 | [diff] [blame] | 832 | if 0: access *: private |
Sjoerd Mullender | 2a45141 | 1993-12-20 09:36:01 +0000 | [diff] [blame] | 833 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 834 | def _comp_data(self, data): |
| 835 | dum = self._comp.SetParam(CL.FRAME_BUFFER_SIZE, len(data)) |
| 836 | dum = self._comp.SetParam(CL.COMPRESSED_BUFFER_SIZE, len(data)) |
| 837 | return self._comp.Compress(nframes, data) |
| 838 | |
| 839 | def _lin2ulaw(self, data): |
| 840 | import audioop |
| 841 | return audioop.lin2ulaw(data, 2) |
| 842 | |
Sjoerd Mullender | 1f05754 | 1994-09-06 16:17:51 +0000 | [diff] [blame] | 843 | def _lin2adpcm(self, data): |
| 844 | import audioop |
| 845 | if not hasattr(self, '_adpcmstate'): |
| 846 | self._adpcmstate = None |
| 847 | data, self._adpcmstate = audioop.lin2adpcm(data, 2, |
| 848 | self._adpcmstate) |
| 849 | return data |
| 850 | |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 851 | def _ensure_header_written(self, datasize): |
| 852 | if not self._nframeswritten: |
| 853 | if self._comptype in ('ULAW', 'ALAW'): |
| 854 | if not self._sampwidth: |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 855 | self._sampwidth = 2 |
| 856 | if self._sampwidth != 2: |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 857 | raise Error, 'sample width must be 2 when compressing with ULAW or ALAW' |
Sjoerd Mullender | 1f05754 | 1994-09-06 16:17:51 +0000 | [diff] [blame] | 858 | if self._comptype == 'G722': |
| 859 | if not self._sampwidth: |
| 860 | self._sampwidth = 2 |
| 861 | if self._sampwidth != 2: |
| 862 | raise Error, 'sample width must be 2 when compressing with G7.22 (ADPCM)' |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 863 | if not self._nchannels: |
| 864 | raise Error, '# channels not specified' |
| 865 | if not self._sampwidth: |
| 866 | raise Error, 'sample width not specified' |
| 867 | if not self._framerate: |
| 868 | raise Error, 'sampling rate not specified' |
| 869 | self._write_header(datasize) |
| 870 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 871 | def _init_compression(self): |
Sjoerd Mullender | 1f05754 | 1994-09-06 16:17:51 +0000 | [diff] [blame] | 872 | if self._comptype == 'G722': |
| 873 | import audioop |
| 874 | self._convert = self._lin2adpcm |
| 875 | return |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 876 | try: |
| 877 | import cl, CL |
| 878 | except ImportError: |
| 879 | if self._comptype == 'ULAW': |
| 880 | try: |
| 881 | import audioop |
| 882 | self._convert = self._lin2ulaw |
| 883 | return |
| 884 | except ImportError: |
| 885 | pass |
| 886 | raise Error, 'cannot write compressed AIFF-C files' |
| 887 | if self._comptype == 'ULAW': |
| 888 | scheme = CL.G711_ULAW |
| 889 | elif self._comptype == 'ALAW': |
| 890 | scheme = CL.G711_ALAW |
| 891 | else: |
| 892 | raise Error, 'unsupported compression type' |
| 893 | self._comp = cl.OpenCompressor(scheme) |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 894 | params = [CL.ORIGINAL_FORMAT, 0, |
| 895 | CL.BITS_PER_COMPONENT, self._sampwidth * 8, |
| 896 | CL.FRAME_RATE, self._framerate, |
| 897 | CL.FRAME_BUFFER_SIZE, 100, |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 898 | CL.COMPRESSED_BUFFER_SIZE, 100] |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 899 | if self._nchannels == 1: |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 900 | params[1] = CL.MONO |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 901 | elif self._nchannels == 2: |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 902 | params[1] = CL.STEREO_INTERLEAVED |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 903 | else: |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 904 | raise Error, 'cannot compress more than 2 channels' |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 905 | self._comp.SetParams(params) |
| 906 | # the compressor produces a header which we ignore |
| 907 | dummy = self._comp.Compress(0, '') |
| 908 | self._convert = self._comp_data |
| 909 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 910 | def _write_header(self, initlength): |
| 911 | if self._aifc and self._comptype != 'NONE': |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame] | 912 | self._init_compression() |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 913 | self._file.write('FORM') |
| 914 | if not self._nframes: |
| 915 | self._nframes = initlength / (self._nchannels * self._sampwidth) |
| 916 | self._datalength = self._nframes * self._nchannels * self._sampwidth |
| 917 | if self._datalength & 1: |
| 918 | self._datalength = self._datalength + 1 |
Sjoerd Mullender | 1f05754 | 1994-09-06 16:17:51 +0000 | [diff] [blame] | 919 | if self._aifc: |
| 920 | if self._comptype in ('ULAW', 'ALAW'): |
| 921 | self._datalength = self._datalength / 2 |
| 922 | if self._datalength & 1: |
| 923 | self._datalength = self._datalength + 1 |
| 924 | elif self._comptype == 'G722': |
| 925 | self._datalength = (self._datalength + 3) / 4 |
| 926 | if self._datalength & 1: |
| 927 | self._datalength = self._datalength + 1 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 928 | self._form_length_pos = self._file.tell() |
| 929 | commlength = self._write_form_length(self._datalength) |
| 930 | if self._aifc: |
| 931 | self._file.write('AIFC') |
| 932 | self._file.write('FVER') |
| 933 | _write_long(self._file, 4) |
| 934 | _write_long(self._file, self._version) |
| 935 | else: |
| 936 | self._file.write('AIFF') |
| 937 | self._file.write('COMM') |
| 938 | _write_long(self._file, commlength) |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 939 | _write_short(self._file, self._nchannels) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 940 | self._nframes_pos = self._file.tell() |
| 941 | _write_long(self._file, self._nframes) |
Sjoerd Mullender | 49c2df1 | 1994-01-06 16:35:34 +0000 | [diff] [blame] | 942 | _write_short(self._file, self._sampwidth * 8) |
| 943 | _write_float(self._file, self._framerate) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 944 | if self._aifc: |
| 945 | self._file.write(self._comptype) |
| 946 | _write_string(self._file, self._compname) |
| 947 | self._file.write('SSND') |
| 948 | self._ssnd_length_pos = self._file.tell() |
| 949 | _write_long(self._file, self._datalength + 8) |
| 950 | _write_long(self._file, 0) |
| 951 | _write_long(self._file, 0) |
| 952 | |
| 953 | def _write_form_length(self, datalength): |
| 954 | if self._aifc: |
| 955 | commlength = 18 + 5 + len(self._compname) |
| 956 | if commlength & 1: |
| 957 | commlength = commlength + 1 |
| 958 | verslength = 12 |
| 959 | else: |
| 960 | commlength = 18 |
| 961 | verslength = 0 |
| 962 | _write_long(self._file, 4 + verslength + self._marklength + \ |
| 963 | 8 + commlength + 16 + datalength) |
| 964 | return commlength |
| 965 | |
| 966 | def _patchheader(self): |
| 967 | curpos = self._file.tell() |
| 968 | if self._datawritten & 1: |
| 969 | datalength = self._datawritten + 1 |
| 970 | self._file.write(chr(0)) |
| 971 | else: |
| 972 | datalength = self._datawritten |
| 973 | if datalength == self._datalength and \ |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 974 | self._nframes == self._nframeswritten and \ |
| 975 | self._marklength == 0: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 976 | self._file.seek(curpos, 0) |
| 977 | return |
| 978 | self._file.seek(self._form_length_pos, 0) |
| 979 | dummy = self._write_form_length(datalength) |
| 980 | self._file.seek(self._nframes_pos, 0) |
| 981 | _write_long(self._file, self._nframeswritten) |
| 982 | self._file.seek(self._ssnd_length_pos, 0) |
| 983 | _write_long(self._file, datalength + 8) |
| 984 | self._file.seek(curpos, 0) |
| 985 | self._nframes = self._nframeswritten |
| 986 | self._datalength = datalength |
| 987 | |
| 988 | def _writemarkers(self): |
| 989 | if len(self._markers) == 0: |
| 990 | return |
| 991 | self._file.write('MARK') |
| 992 | length = 2 |
| 993 | for marker in self._markers: |
| 994 | id, pos, name = marker |
| 995 | length = length + len(name) + 1 + 6 |
| 996 | if len(name) & 1 == 0: |
| 997 | length = length + 1 |
| 998 | _write_long(self._file, length) |
| 999 | self._marklength = length + 8 |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 1000 | _write_short(self._file, len(self._markers)) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 1001 | for marker in self._markers: |
| 1002 | id, pos, name = marker |
| 1003 | _write_short(self._file, id) |
| 1004 | _write_long(self._file, pos) |
| 1005 | _write_string(self._file, name) |
| 1006 | |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 1007 | def open(f, mode): |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 1008 | if mode == 'r': |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 1009 | return Aifc_read(f) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 1010 | elif mode == 'w': |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 1011 | return Aifc_write(f) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 1012 | else: |
Sjoerd Mullender | 2a45141 | 1993-12-20 09:36:01 +0000 | [diff] [blame] | 1013 | raise Error, "mode must be 'r' or 'w'" |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 1014 | |
Guido van Rossum | 7bc817d | 1993-12-17 15:25:27 +0000 | [diff] [blame] | 1015 | openfp = open # B/W compatibility |