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') |
| 58 | # or |
| 59 | # f = aifc.openfp(filep, 'r') |
| 60 | # where file is the name of a file and filep is an open file pointer. |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 61 | # The open file pointer must have methods read(), seek(), and close(). |
| 62 | # In some types of audio files, if the setpos() method is not used, |
| 63 | # the seek() method is not necessary. |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 64 | # |
| 65 | # This returns an instance of a class with the following public methods: |
| 66 | # getnchannels() -- returns number of audio channels (1 for |
| 67 | # mono, 2 for stereo) |
| 68 | # getsampwidth() -- returns sample width in bytes |
| 69 | # getframerate() -- returns sampling frequency |
| 70 | # getnframes() -- returns number of audio frames |
| 71 | # getcomptype() -- returns compression type ('NONE' for AIFF files) |
| 72 | # getcompname() -- returns human-readable version of |
| 73 | # compression type ('not compressed' for AIFF files) |
| 74 | # getparams() -- returns a tuple consisting of all of the |
| 75 | # above in the above order |
| 76 | # getmarkers() -- get the list of marks in the audio file or None |
| 77 | # if there are no marks |
| 78 | # getmark(id) -- get mark with the specified id (raises an error |
| 79 | # if the mark does not exist) |
| 80 | # readframes(n) -- returns at most n frames of audio |
| 81 | # rewind() -- rewind to the beginning of the audio stream |
| 82 | # setpos(pos) -- seek to the specified position |
| 83 | # tell() -- return the current position |
Guido van Rossum | 17ed1ae | 1993-06-01 13:21:04 +0000 | [diff] [blame] | 84 | # close() -- close the instance (make it unusable) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 85 | # The position returned by tell(), the position given to setpos() and |
| 86 | # the position of marks are all compatible and have nothing to do with |
| 87 | # the actual postion in the file. |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 88 | # The close() method is called automatically when the class instance |
| 89 | # is destroyed. |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 90 | # |
| 91 | # Writing AIFF files: |
| 92 | # f = aifc.open(file, 'w') |
| 93 | # or |
| 94 | # f = aifc.openfp(filep, 'w') |
| 95 | # where file is the name of a file and filep is an open file pointer. |
| 96 | # The open file pointer must have methods write(), tell(), seek(), and |
| 97 | # close(). |
| 98 | # |
| 99 | # This returns an instance of a class with the following public methods: |
| 100 | # aiff() -- create an AIFF file (AIFF-C default) |
| 101 | # aifc() -- create an AIFF-C file |
| 102 | # setnchannels(n) -- set the number of channels |
| 103 | # setsampwidth(n) -- set the sample width |
| 104 | # setframerate(n) -- set the frame rate |
| 105 | # setnframes(n) -- set the number of frames |
| 106 | # setcomptype(type, name) |
| 107 | # -- set the compression type and the |
| 108 | # human-readable compression type |
| 109 | # setparams(nchannels, sampwidth, framerate, nframes, comptype, compname) |
| 110 | # -- set all parameters at once |
| 111 | # setmark(id, pos, name) |
| 112 | # -- add specified mark to the list of marks |
| 113 | # tell() -- return current position in output file (useful |
| 114 | # in combination with setmark()) |
| 115 | # writeframesraw(data) |
| 116 | # -- write audio frames without pathing up the |
| 117 | # file header |
| 118 | # writeframes(data) |
| 119 | # -- write audio frames and patch up the file header |
| 120 | # close() -- patch up the file header and close the |
| 121 | # output file |
| 122 | # You should set the parameters before the first writeframesraw or |
| 123 | # writeframes. The total number of frames does not need to be set, |
| 124 | # but when it is set to the correct value, the header does not have to |
| 125 | # be patched up. |
| 126 | # It is best to first set all parameters, perhaps possibly the |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 127 | # compression type, and then write audio frames using writeframesraw. |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 128 | # When all frames have been written, either call writeframes('') or |
| 129 | # close() to patch up the sizes in the header. |
| 130 | # Marks can be added anytime. If there are any marks, ypu must call |
| 131 | # close() after all frames have been written. |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 132 | # The close() method is called automatically when the class instance |
| 133 | # is destroyed. |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 134 | # |
| 135 | # When a file is opened with the extension '.aiff', an AIFF file is |
| 136 | # written, otherwise an AIFF-C file is written. This default can be |
| 137 | # changed by calling aiff() or aifc() before the first writeframes or |
| 138 | # writeframesraw. |
| 139 | |
| 140 | import builtin |
| 141 | import AL |
| 142 | try: |
| 143 | import CL |
| 144 | except ImportError: |
| 145 | pass |
| 146 | |
| 147 | Error = 'aifc.Error' |
| 148 | |
| 149 | _AIFC_version = 0xA2805140 # Version 1 of AIFF-C |
| 150 | |
| 151 | _skiplist = 'COMT', 'INST', 'MIDI', 'AESD', \ |
| 152 | 'APPL', 'NAME', 'AUTH', '(c) ', 'ANNO' |
| 153 | |
| 154 | _nchannelslist = [(1, AL.MONO), (2, AL.STEREO)] |
| 155 | _sampwidthlist = [(8, AL.SAMPLE_8), (16, AL.SAMPLE_16), (24, AL.SAMPLE_24)] |
| 156 | _frameratelist = [(48000, AL.RATE_48000), \ |
| 157 | (44100, AL.RATE_44100), \ |
| 158 | (32000, AL.RATE_32000), \ |
| 159 | (22050, AL.RATE_22050), \ |
| 160 | (16000, AL.RATE_16000), \ |
| 161 | (11025, AL.RATE_11025), \ |
| 162 | ( 8000, AL.RATE_8000)] |
| 163 | |
| 164 | def _convert1(value, list): |
| 165 | for t in list: |
| 166 | if value == t[0]: |
| 167 | return t[1] |
| 168 | raise Error, 'unknown parameter value' |
| 169 | |
| 170 | def _convert2(value, list): |
| 171 | for t in list: |
| 172 | if value == t[1]: |
| 173 | return t[0] |
| 174 | raise Error, 'unknown parameter value' |
| 175 | |
| 176 | def _read_long(file): |
| 177 | x = 0L |
| 178 | for i in range(4): |
| 179 | byte = file.read(1) |
| 180 | if byte == '': |
| 181 | raise EOFError |
| 182 | x = x*256 + ord(byte) |
| 183 | if x >= 0x80000000L: |
| 184 | x = x - 0x100000000L |
| 185 | return int(x) |
| 186 | |
| 187 | def _read_ulong(file): |
| 188 | x = 0L |
| 189 | for i in range(4): |
| 190 | byte = file.read(1) |
| 191 | if byte == '': |
| 192 | raise EOFError |
| 193 | x = x*256 + ord(byte) |
| 194 | return x |
| 195 | |
| 196 | def _read_short(file): |
| 197 | x = 0 |
| 198 | for i in range(2): |
| 199 | byte = file.read(1) |
| 200 | if byte == '': |
| 201 | raise EOFError |
| 202 | x = x*256 + ord(byte) |
| 203 | if x >= 0x8000: |
| 204 | x = x - 0x10000 |
| 205 | return x |
| 206 | |
| 207 | def _read_string(file): |
| 208 | length = ord(file.read(1)) |
| 209 | data = file.read(length) |
| 210 | if length & 1 == 0: |
| 211 | dummy = file.read(1) |
| 212 | return data |
| 213 | |
| 214 | _HUGE_VAL = 1.79769313486231e+308 # See <limits.h> |
| 215 | |
| 216 | def _read_float(f): # 10 bytes |
| 217 | import math |
| 218 | expon = _read_short(f) # 2 bytes |
| 219 | sign = 1 |
| 220 | if expon < 0: |
| 221 | sign = -1 |
| 222 | expon = expon + 0x8000 |
| 223 | himant = _read_ulong(f) # 4 bytes |
| 224 | lomant = _read_ulong(f) # 4 bytes |
| 225 | if expon == himant == lomant == 0: |
| 226 | f = 0.0 |
| 227 | elif expon == 0x7FFF: |
| 228 | f = _HUGE_VAL |
| 229 | else: |
| 230 | expon = expon - 16383 |
| 231 | f = (himant * 0x100000000L + lomant) * pow(2.0, expon - 63) |
| 232 | return sign * f |
| 233 | |
| 234 | def _write_short(f, x): |
| 235 | d, m = divmod(x, 256) |
| 236 | f.write(chr(d)) |
| 237 | f.write(chr(m)) |
| 238 | |
| 239 | def _write_long(f, x): |
| 240 | if x < 0: |
| 241 | x = x + 0x100000000L |
| 242 | data = [] |
| 243 | for i in range(4): |
| 244 | d, m = divmod(x, 256) |
| 245 | data.insert(0, m) |
| 246 | x = d |
| 247 | for i in range(4): |
| 248 | f.write(chr(int(data[i]))) |
| 249 | |
| 250 | def _write_string(f, s): |
| 251 | f.write(chr(len(s))) |
| 252 | f.write(s) |
| 253 | if len(s) & 1 == 0: |
| 254 | f.write(chr(0)) |
| 255 | |
| 256 | def _write_float(f, x): |
| 257 | import math |
| 258 | if x < 0: |
| 259 | sign = 0x8000 |
| 260 | x = x * -1 |
| 261 | else: |
| 262 | sign = 0 |
| 263 | if x == 0: |
| 264 | expon = 0 |
| 265 | himant = 0 |
| 266 | lomant = 0 |
| 267 | else: |
| 268 | fmant, expon = math.frexp(x) |
| 269 | if expon > 16384 or fmant >= 1: # Infinity or NaN |
| 270 | expon = sign|0x7FFF |
| 271 | himant = 0 |
| 272 | lomant = 0 |
| 273 | else: # Finite |
| 274 | expon = expon + 16382 |
| 275 | if expon < 0: # denormalized |
| 276 | fmant = math.ldexp(fmant, expon) |
| 277 | expon = 0 |
| 278 | expon = expon | sign |
| 279 | fmant = math.ldexp(fmant, 32) |
| 280 | fsmant = math.floor(fmant) |
| 281 | himant = long(fsmant) |
| 282 | fmant = math.ldexp(fmant - fsmant, 32) |
| 283 | fsmant = math.floor(fmant) |
| 284 | lomant = long(fsmant) |
| 285 | _write_short(f, expon) |
| 286 | _write_long(f, himant) |
| 287 | _write_long(f, lomant) |
| 288 | |
Guido van Rossum | d316607 | 1993-05-24 14:16:22 +0000 | [diff] [blame] | 289 | class Chunk: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 290 | def init(self, file): |
| 291 | self.file = file |
| 292 | self.chunkname = self.file.read(4) |
| 293 | if len(self.chunkname) < 4: |
| 294 | raise EOFError |
| 295 | self.chunksize = _read_long(self.file) |
| 296 | self.size_read = 0 |
| 297 | self.offset = self.file.tell() |
| 298 | return self |
| 299 | |
| 300 | def rewind(self): |
| 301 | self.file.seek(self.offset, 0) |
| 302 | self.size_read = 0 |
| 303 | |
| 304 | def setpos(self, pos): |
| 305 | if pos < 0 or pos > self.chunksize: |
| 306 | raise RuntimeError |
| 307 | self.file.seek(self.offset + pos, 0) |
| 308 | self.size_read = pos |
| 309 | |
| 310 | def read(self, length): |
| 311 | if self.size_read >= self.chunksize: |
| 312 | return '' |
| 313 | if length > self.chunksize - self.size_read: |
| 314 | length = self.chunksize - self.size_read |
| 315 | data = self.file.read(length) |
| 316 | self.size_read = self.size_read + len(data) |
| 317 | return data |
| 318 | |
| 319 | def skip(self): |
| 320 | try: |
| 321 | self.file.seek(self.chunksize - self.size_read, 1) |
| 322 | except RuntimeError: |
| 323 | while self.size_read < self.chunksize: |
| 324 | dummy = self.read(8192) |
| 325 | if not dummy: |
| 326 | raise EOFError |
| 327 | if self.chunksize & 1: |
| 328 | dummy = self.read(1) |
| 329 | |
Guido van Rossum | d316607 | 1993-05-24 14:16:22 +0000 | [diff] [blame] | 330 | class Aifc_read: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 331 | # Variables used in this class: |
| 332 | # |
| 333 | # These variables are available to the user though appropriate |
| 334 | # methods of this class: |
| 335 | # _file -- the open file with methods read(), close(), and seek() |
| 336 | # set through the init() ir initfp() method |
| 337 | # _nchannels -- the number of audio channels |
| 338 | # available through the getnchannels() method |
| 339 | # _nframes -- the number of audio frames |
| 340 | # available through the getnframes() method |
| 341 | # _sampwidth -- the number of bytes per audio sample |
| 342 | # available through the getsampwidth() method |
| 343 | # _framerate -- the sampling frequency |
| 344 | # available through the getframerate() method |
| 345 | # _comptype -- the AIFF-C compression type ('NONE' if AIFF) |
| 346 | # available through the getcomptype() method |
| 347 | # _compname -- the human-readable AIFF-C compression type |
| 348 | # available through the getcomptype() method |
| 349 | # _markers -- the marks in the audio file |
| 350 | # available through the getmarkers() and getmark() |
| 351 | # methods |
| 352 | # _soundpos -- the position in the audio stream |
| 353 | # available through the tell() method, set through the |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 354 | # setpos() method |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 355 | # |
| 356 | # These variables are used internally only: |
| 357 | # _version -- the AIFF-C version number |
| 358 | # _decomp -- the decompressor from builtin module cl |
| 359 | # _comm_chunk_read -- 1 iff the COMM chunk has been read |
| 360 | # _aifc -- 1 iff reading an AIFF-C file |
| 361 | # _ssnd_seek_needed -- 1 iff positioned correctly in audio |
| 362 | # file for readframes() |
| 363 | # _ssnd_chunk -- instantiation of a chunk class for the SSND chunk |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 364 | # _framesize -- size of one frame in the file |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 365 | def initfp(self, file): |
| 366 | self._file = file |
| 367 | self._version = 0 |
| 368 | self._decomp = None |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 369 | self._convert = None |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 370 | self._markers = [] |
| 371 | self._soundpos = 0 |
| 372 | form = self._file.read(4) |
| 373 | if form != 'FORM': |
| 374 | raise Error, 'file does not start with FORM id' |
| 375 | formlength = _read_long(self._file) |
| 376 | if formlength <= 0: |
| 377 | raise Error, 'invalid FORM chunk data size' |
| 378 | formdata = self._file.read(4) |
| 379 | formlength = formlength - 4 |
| 380 | if formdata == 'AIFF': |
| 381 | self._aifc = 0 |
| 382 | elif formdata == 'AIFC': |
| 383 | self._aifc = 1 |
| 384 | else: |
| 385 | raise Error, 'not an AIFF or AIFF-C file' |
| 386 | self._comm_chunk_read = 0 |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 387 | while formlength > 0: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 388 | self._ssnd_seek_needed = 1 |
Sjoerd Mullender | 8d733a0 | 1993-01-29 12:01:00 +0000 | [diff] [blame] | 389 | #DEBUG: SGI's soundfiler has a bug. There should |
| 390 | # be no need to check for EOF here. |
| 391 | try: |
| 392 | chunk = Chunk().init(self._file) |
| 393 | except EOFError: |
| 394 | if formlength == 8: |
| 395 | print 'Warning: FORM chunk size too large' |
| 396 | formlength = 0 |
| 397 | break |
| 398 | raise EOFError # different error, raise exception |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 399 | if chunk.chunkname == 'COMM': |
| 400 | self._read_comm_chunk(chunk) |
| 401 | self._comm_chunk_read = 1 |
| 402 | elif chunk.chunkname == 'SSND': |
| 403 | self._ssnd_chunk = chunk |
| 404 | dummy = chunk.read(8) |
| 405 | self._ssnd_seek_needed = 0 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 406 | elif chunk.chunkname == 'FVER': |
| 407 | self._version = _read_long(chunk) |
| 408 | elif chunk.chunkname == 'MARK': |
| 409 | self._readmark(chunk) |
| 410 | elif chunk.chunkname in _skiplist: |
| 411 | pass |
| 412 | else: |
| 413 | raise Error, 'unrecognized chunk type '+chunk.chunkname |
Sjoerd Mullender | 4150ede | 1993-08-26 14:12:07 +0000 | [diff] [blame] | 414 | formlength = formlength - 8 - chunk.chunksize |
| 415 | if chunk.chunksize & 1: |
| 416 | formlength = formlength - 1 |
Sjoerd Mullender | 93f0740 | 1993-01-26 09:24:37 +0000 | [diff] [blame] | 417 | if formlength > 0: |
| 418 | chunk.skip() |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 419 | if not self._comm_chunk_read or not self._ssnd_chunk: |
| 420 | raise Error, 'COMM chunk and/or SSND chunk missing' |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 421 | if self._aifc and self._decomp: |
| 422 | params = [CL.ORIGINAL_FORMAT, 0, \ |
| 423 | CL.BITS_PER_COMPONENT, 0, \ |
| 424 | CL.FRAME_RATE, self._framerate] |
| 425 | if self._nchannels == AL.MONO: |
| 426 | params[1] = CL.MONO |
| 427 | else: |
| 428 | params[1] = CL.STEREO_INTERLEAVED |
| 429 | if self._sampwidth == AL.SAMPLE_8: |
| 430 | params[3] = 8 |
| 431 | elif self._sampwidth == AL.SAMPLE_16: |
| 432 | params[3] = 16 |
| 433 | else: |
| 434 | params[3] = 24 |
| 435 | self._decomp.SetParams(params) |
| 436 | return self |
| 437 | |
| 438 | def init(self, filename): |
| 439 | return self.initfp(builtin.open(filename, 'r')) |
| 440 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 441 | def __del__(self): |
| 442 | if self._file: |
| 443 | self.close() |
| 444 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 445 | # |
| 446 | # User visible methods. |
| 447 | # |
| 448 | def getfp(self): |
| 449 | return self._file |
| 450 | |
| 451 | def rewind(self): |
| 452 | self._ssnd_seek_needed = 1 |
| 453 | self._soundpos = 0 |
| 454 | |
| 455 | def close(self): |
| 456 | if self._decomp: |
| 457 | self._decomp.CloseDecompressor() |
| 458 | self._decomp = None |
| 459 | self._file.close() |
| 460 | self._file = None |
| 461 | |
| 462 | def tell(self): |
| 463 | return self._soundpos |
| 464 | |
| 465 | def getnchannels(self): |
| 466 | return self._nchannels |
| 467 | |
| 468 | def getnframes(self): |
| 469 | return self._nframes |
| 470 | |
| 471 | def getsampwidth(self): |
| 472 | return self._sampwidth |
| 473 | |
| 474 | def getframerate(self): |
| 475 | return self._framerate |
| 476 | |
| 477 | def getcomptype(self): |
| 478 | return self._comptype |
| 479 | |
| 480 | def getcompname(self): |
| 481 | return self._compname |
| 482 | |
| 483 | ## def getversion(self): |
| 484 | ## return self._version |
| 485 | |
| 486 | def getparams(self): |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 487 | return self.getnchannels(), self.getsampwidth(), \ |
| 488 | self.getframerate(), self.getnframes(), \ |
| 489 | self.getcomptype(), self.getcompname() |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 490 | |
| 491 | def getmarkers(self): |
| 492 | if len(self._markers) == 0: |
| 493 | return None |
| 494 | return self._markers |
| 495 | |
| 496 | def getmark(self, id): |
| 497 | for marker in self._markers: |
| 498 | if id == marker[0]: |
| 499 | return marker |
| 500 | raise Error, 'marker ' + `id` + ' does not exist' |
| 501 | |
| 502 | def setpos(self, pos): |
| 503 | if pos < 0 or pos > self._nframes: |
| 504 | raise Error, 'position not in range' |
| 505 | self._soundpos = pos |
| 506 | self._ssnd_seek_needed = 1 |
| 507 | |
| 508 | def readframes(self, nframes): |
| 509 | if self._ssnd_seek_needed: |
| 510 | self._ssnd_chunk.rewind() |
| 511 | dummy = self._ssnd_chunk.read(8) |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 512 | pos = self._soundpos * self._framesize |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 513 | if pos: |
| 514 | self._ssnd_chunk.setpos(pos + 8) |
| 515 | self._ssnd_seek_needed = 0 |
Sjoerd Mullender | 8d733a0 | 1993-01-29 12:01:00 +0000 | [diff] [blame] | 516 | if nframes == 0: |
| 517 | return '' |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 518 | data = self._ssnd_chunk.read(nframes * self._framesize) |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 519 | if self._convert and data: |
| 520 | data = self._convert(data) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 521 | self._soundpos = self._soundpos + len(data) / (self._nchannels * self._sampwidth) |
| 522 | return data |
| 523 | |
| 524 | # |
| 525 | # Internal methods. |
| 526 | # |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 527 | def _decomp_data(self, data): |
| 528 | dummy = self._decomp.SetParam(CL.FRAME_BUFFER_SIZE, |
| 529 | len(data) * 2) |
| 530 | return self._decomp.Decompress(len(data) / self._nchannels, |
| 531 | data) |
| 532 | |
| 533 | def _ulaw2lin(self, data): |
| 534 | import audioop |
| 535 | return audioop.ulaw2lin(data, 2) |
| 536 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 537 | def _read_comm_chunk(self, chunk): |
| 538 | nchannels = _read_short(chunk) |
| 539 | self._nchannels = _convert1(nchannels, _nchannelslist) |
| 540 | self._nframes = _read_long(chunk) |
| 541 | sampwidth = _read_short(chunk) |
| 542 | self._sampwidth = _convert1(sampwidth, _sampwidthlist) |
| 543 | framerate = _read_float(chunk) |
| 544 | self._framerate = _convert1(framerate, _frameratelist) |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 545 | self._framesize = self._nchannels * self._sampwidth |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 546 | if self._aifc: |
| 547 | #DEBUG: SGI's soundeditor produces a bad size :-( |
| 548 | kludge = 0 |
| 549 | if chunk.chunksize == 18: |
| 550 | kludge = 1 |
| 551 | print 'Warning: bad COMM chunk size' |
| 552 | chunk.chunksize = 23 |
| 553 | #DEBUG end |
| 554 | self._comptype = chunk.read(4) |
| 555 | #DEBUG start |
| 556 | if kludge: |
| 557 | length = ord(chunk.file.read(1)) |
| 558 | if length & 1 == 0: |
| 559 | length = length + 1 |
| 560 | chunk.chunksize = chunk.chunksize + length |
| 561 | chunk.file.seek(-1, 1) |
| 562 | #DEBUG end |
| 563 | self._compname = _read_string(chunk) |
| 564 | if self._comptype != 'NONE': |
| 565 | try: |
| 566 | import cl, CL |
| 567 | except ImportError: |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 568 | if self._comptype == 'ULAW': |
| 569 | try: |
| 570 | import audioop |
| 571 | self._convert = self._ulaw2lin |
| 572 | self._framesize = self._framesize / 2 |
| 573 | return |
| 574 | except ImportError: |
| 575 | pass |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 576 | raise Error, 'cannot read compressed AIFF-C files' |
| 577 | if self._comptype == 'ULAW': |
| 578 | scheme = CL.G711_ULAW |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 579 | self._framesize = self._framesize / 2 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 580 | elif self._comptype == 'ALAW': |
| 581 | scheme = CL.G711_ALAW |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 582 | self._framesize = self._framesize / 2 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 583 | else: |
| 584 | raise Error, 'unsupported compression type' |
| 585 | self._decomp = cl.OpenDecompressor(scheme) |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 586 | self._convert = self._decomp_data |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 587 | else: |
| 588 | self._comptype = 'NONE' |
| 589 | self._compname = 'not compressed' |
| 590 | |
| 591 | def _readmark(self, chunk): |
| 592 | nmarkers = _read_short(chunk) |
Guido van Rossum | 9b3bc71 | 1993-06-20 21:02:22 +0000 | [diff] [blame] | 593 | # Some files appear to contain invalid counts. |
| 594 | # Cope with this by testing for EOF. |
| 595 | try: |
| 596 | for i in range(nmarkers): |
| 597 | id = _read_short(chunk) |
| 598 | pos = _read_long(chunk) |
| 599 | name = _read_string(chunk) |
| 600 | self._markers.append((id, pos, name)) |
| 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() |
| 614 | # set through the init() or initfp() method |
| 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 | |
| 638 | def init(self, filename): |
| 639 | self = self.initfp(builtin.open(filename, 'w')) |
| 640 | if filename[-5:] == '.aiff': |
| 641 | self._aifc = 0 |
| 642 | else: |
| 643 | self._aifc = 1 |
| 644 | return self |
| 645 | |
| 646 | def initfp(self, file): |
| 647 | self._file = file |
| 648 | self._version = _AIFC_version |
| 649 | self._comptype = 'NONE' |
| 650 | self._compname = 'not compressed' |
| 651 | self._comp = None |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 652 | self._convert = None |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 653 | self._nchannels = 0 |
| 654 | self._sampwidth = 0 |
| 655 | self._framerate = 0 |
| 656 | self._nframes = 0 |
| 657 | self._nframeswritten = 0 |
| 658 | self._datawritten = 0 |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 659 | self._datalength = 0 |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 660 | self._markers = [] |
| 661 | self._marklength = 0 |
| 662 | self._aifc = 1 # AIFF-C is default |
| 663 | return self |
| 664 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 665 | def __del__(self): |
| 666 | if self._file: |
| 667 | self.close() |
| 668 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 669 | # |
| 670 | # User visible methods. |
| 671 | # |
| 672 | def aiff(self): |
| 673 | if self._nframeswritten: |
| 674 | raise Error, 'cannot change parameters after starting to write' |
| 675 | self._aifc = 0 |
| 676 | |
| 677 | def aifc(self): |
| 678 | if self._nframeswritten: |
| 679 | raise Error, 'cannot change parameters after starting to write' |
| 680 | self._aifc = 1 |
| 681 | |
| 682 | def setnchannels(self, nchannels): |
| 683 | if self._nframeswritten: |
| 684 | raise Error, 'cannot change parameters after starting to write' |
Sjoerd Mullender | 4ab6ff8 | 1993-02-05 13:43:44 +0000 | [diff] [blame] | 685 | dummy = _convert2(nchannels, _nchannelslist) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 686 | self._nchannels = nchannels |
| 687 | |
| 688 | def getnchannels(self): |
| 689 | if not self._nchannels: |
| 690 | raise Error, 'number of channels not set' |
| 691 | return self._nchannels |
| 692 | |
| 693 | def setsampwidth(self, sampwidth): |
| 694 | if self._nframeswritten: |
| 695 | raise Error, 'cannot change parameters after starting to write' |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 696 | dummy = _convert2(sampwidth, _sampwidthlist) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 697 | self._sampwidth = sampwidth |
| 698 | |
| 699 | def getsampwidth(self): |
| 700 | if not self._sampwidth: |
| 701 | raise Error, 'sample width not set' |
| 702 | return self._sampwidth |
| 703 | |
| 704 | def setframerate(self, framerate): |
| 705 | if self._nframeswritten: |
| 706 | raise Error, 'cannot change parameters after starting to write' |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 707 | dummy = _convert2(framerate, _frameratelist) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 708 | self._framerate = framerate |
| 709 | |
| 710 | def getframerate(self): |
| 711 | if not self._framerate: |
| 712 | raise Error, 'frame rate not set' |
| 713 | return self._framerate |
| 714 | |
| 715 | def setnframes(self, nframes): |
| 716 | if self._nframeswritten: |
| 717 | raise Error, 'cannot change parameters after starting to write' |
| 718 | self._nframes = nframes |
| 719 | |
| 720 | def getnframes(self): |
| 721 | return self._nframeswritten |
| 722 | |
| 723 | def setcomptype(self, comptype, compname): |
| 724 | if self._nframeswritten: |
| 725 | raise Error, 'cannot change parameters after starting to write' |
| 726 | if comptype not in ('NONE', 'ULAW', 'ALAW'): |
| 727 | raise Error, 'unsupported compression type' |
| 728 | self._comptype = comptype |
| 729 | self._compname = compname |
| 730 | |
| 731 | def getcomptype(self): |
| 732 | return self._comptype |
| 733 | |
| 734 | def getcompname(self): |
| 735 | return self._compname |
| 736 | |
| 737 | ## def setversion(self, version): |
| 738 | ## if self._nframeswritten: |
| 739 | ## raise Error, 'cannot change parameters after starting to write' |
| 740 | ## self._version = version |
| 741 | |
| 742 | def setparams(self, (nchannels, sampwidth, framerate, nframes, comptype, compname)): |
| 743 | if self._nframeswritten: |
| 744 | raise Error, 'cannot change parameters after starting to write' |
| 745 | if comptype not in ('NONE', 'ULAW', 'ALAW'): |
| 746 | raise Error, 'unsupported compression type' |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 747 | dummy = _convert2(nchannels, _nchannelslist) |
| 748 | dummy = _convert2(sampwidth, _sampwidthlist) |
| 749 | dummy = _convert2(framerate, _frameratelist) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 750 | self._nchannels = nchannels |
| 751 | self._sampwidth = sampwidth |
| 752 | self._framerate = framerate |
| 753 | self._nframes = nframes |
| 754 | self._comptype = comptype |
| 755 | self._compname = compname |
| 756 | |
| 757 | def getparams(self): |
| 758 | if not self._nchannels or not self._sampwidth or not self._framerate: |
| 759 | raise Error, 'not all parameters set' |
| 760 | return self._nchannels, self._sampwidth, self._framerate, \ |
| 761 | self._nframes, self._comptype, self._compname |
| 762 | |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 763 | def setmark(self, id, pos, name): |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 764 | if id <= 0: |
| 765 | raise Error, 'marker ID must be > 0' |
| 766 | if pos < 0: |
| 767 | raise Error, 'marker position must be >= 0' |
| 768 | if type(name) != type(''): |
| 769 | raise Error, 'marker name must be a string' |
| 770 | for i in range(len(self._markers)): |
| 771 | if id == self._markers[i][0]: |
| 772 | self._markers[i] = id, pos, name |
| 773 | return |
| 774 | self._markers.append((id, pos, name)) |
| 775 | |
| 776 | def getmark(self, id): |
| 777 | for marker in self._markers: |
| 778 | if id == marker[0]: |
| 779 | return marker |
| 780 | raise Error, 'marker ' + `id` + ' does not exist' |
| 781 | |
| 782 | def getmarkers(self): |
| 783 | if len(self._markers) == 0: |
| 784 | return None |
| 785 | return self._markers |
| 786 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 787 | def tell(self): |
| 788 | return self._nframeswritten |
| 789 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 790 | def writeframesraw(self, data): |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 791 | self._ensure_header_written(len(data)) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 792 | nframes = len(data) / (self._sampwidth * self._nchannels) |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 793 | if self._convert: |
| 794 | data = self._convert(data) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 795 | self._file.write(data) |
| 796 | self._nframeswritten = self._nframeswritten + nframes |
| 797 | self._datawritten = self._datawritten + len(data) |
| 798 | |
| 799 | def writeframes(self, data): |
| 800 | self.writeframesraw(data) |
| 801 | if self._nframeswritten != self._nframes or \ |
| 802 | self._datalength != self._datawritten: |
| 803 | self._patchheader() |
| 804 | |
| 805 | def close(self): |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 806 | self._ensure_header_written(0) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 807 | if self._datawritten & 1: |
| 808 | # quick pad to even size |
| 809 | self._file.write(chr(0)) |
| 810 | self._datawritten = self._datawritten + 1 |
| 811 | self._writemarkers() |
| 812 | if self._nframeswritten != self._nframes or \ |
| 813 | self._datalength != self._datawritten or \ |
| 814 | self._marklength: |
| 815 | self._patchheader() |
| 816 | if self._comp: |
| 817 | self._comp.CloseCompressor() |
| 818 | self._comp = None |
| 819 | self._file.close() |
| 820 | self._file = None |
| 821 | |
| 822 | # |
| 823 | # Internal methods. |
| 824 | # |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 825 | def _comp_data(self, data): |
| 826 | dum = self._comp.SetParam(CL.FRAME_BUFFER_SIZE, len(data)) |
| 827 | dum = self._comp.SetParam(CL.COMPRESSED_BUFFER_SIZE, len(data)) |
| 828 | return self._comp.Compress(nframes, data) |
| 829 | |
| 830 | def _lin2ulaw(self, data): |
| 831 | import audioop |
| 832 | return audioop.lin2ulaw(data, 2) |
| 833 | |
Guido van Rossum | 52fc1f6 | 1993-06-17 12:38:10 +0000 | [diff] [blame] | 834 | def _ensure_header_written(self, datasize): |
| 835 | if not self._nframeswritten: |
| 836 | if self._comptype in ('ULAW', 'ALAW'): |
| 837 | if not self._sampwidth: |
| 838 | self._sampwidth = AL.SAMPLE_16 |
| 839 | if self._sampwidth != AL.SAMPLE_16: |
| 840 | raise Error, 'sample width must be 2 when compressing with ULAW or ALAW' |
| 841 | if not self._nchannels: |
| 842 | raise Error, '# channels not specified' |
| 843 | if not self._sampwidth: |
| 844 | raise Error, 'sample width not specified' |
| 845 | if not self._framerate: |
| 846 | raise Error, 'sampling rate not specified' |
| 847 | self._write_header(datasize) |
| 848 | |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 849 | def _init_compression(self): |
| 850 | try: |
| 851 | import cl, CL |
| 852 | except ImportError: |
| 853 | if self._comptype == 'ULAW': |
| 854 | try: |
| 855 | import audioop |
| 856 | self._convert = self._lin2ulaw |
| 857 | return |
| 858 | except ImportError: |
| 859 | pass |
| 860 | raise Error, 'cannot write compressed AIFF-C files' |
| 861 | if self._comptype == 'ULAW': |
| 862 | scheme = CL.G711_ULAW |
| 863 | elif self._comptype == 'ALAW': |
| 864 | scheme = CL.G711_ALAW |
| 865 | else: |
| 866 | raise Error, 'unsupported compression type' |
| 867 | self._comp = cl.OpenCompressor(scheme) |
| 868 | params = [CL.ORIGINAL_FORMAT, 0, \ |
| 869 | CL.BITS_PER_COMPONENT, 0, \ |
| 870 | CL.FRAME_RATE, self._framerate, \ |
| 871 | CL.FRAME_BUFFER_SIZE, 100, \ |
| 872 | CL.COMPRESSED_BUFFER_SIZE, 100] |
| 873 | if self._nchannels == AL.MONO: |
| 874 | params[1] = CL.MONO |
| 875 | else: |
| 876 | params[1] = CL.STEREO_INTERLEAVED |
| 877 | if self._sampwidth == AL.SAMPLE_8: |
| 878 | params[3] = 8 |
| 879 | elif self._sampwidth == AL.SAMPLE_16: |
| 880 | params[3] = 16 |
| 881 | else: |
| 882 | params[3] = 24 |
| 883 | self._comp.SetParams(params) |
| 884 | # the compressor produces a header which we ignore |
| 885 | dummy = self._comp.Compress(0, '') |
| 886 | self._convert = self._comp_data |
| 887 | |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 888 | def _write_header(self, initlength): |
| 889 | if self._aifc and self._comptype != 'NONE': |
Sjoerd Mullender | 43bf0bc | 1993-12-13 11:42:39 +0000 | [diff] [blame^] | 890 | self._init_compression() |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 891 | self._file.write('FORM') |
| 892 | if not self._nframes: |
| 893 | self._nframes = initlength / (self._nchannels * self._sampwidth) |
| 894 | self._datalength = self._nframes * self._nchannels * self._sampwidth |
| 895 | if self._datalength & 1: |
| 896 | self._datalength = self._datalength + 1 |
| 897 | if self._aifc and self._comptype in ('ULAW', 'ALAW'): |
| 898 | self._datalength = self._datalength / 2 |
| 899 | if self._datalength & 1: |
| 900 | self._datalength = self._datalength + 1 |
| 901 | self._form_length_pos = self._file.tell() |
| 902 | commlength = self._write_form_length(self._datalength) |
| 903 | if self._aifc: |
| 904 | self._file.write('AIFC') |
| 905 | self._file.write('FVER') |
| 906 | _write_long(self._file, 4) |
| 907 | _write_long(self._file, self._version) |
| 908 | else: |
| 909 | self._file.write('AIFF') |
| 910 | self._file.write('COMM') |
| 911 | _write_long(self._file, commlength) |
Sjoerd Mullender | 3a99727 | 1993-02-04 16:43:28 +0000 | [diff] [blame] | 912 | _write_short(self._file, _convert2(self._nchannels, _nchannelslist)) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 913 | self._nframes_pos = self._file.tell() |
| 914 | _write_long(self._file, self._nframes) |
| 915 | _write_short(self._file, _convert2(self._sampwidth, _sampwidthlist)) |
| 916 | _write_float(self._file, _convert2(self._framerate, _frameratelist)) |
| 917 | if self._aifc: |
| 918 | self._file.write(self._comptype) |
| 919 | _write_string(self._file, self._compname) |
| 920 | self._file.write('SSND') |
| 921 | self._ssnd_length_pos = self._file.tell() |
| 922 | _write_long(self._file, self._datalength + 8) |
| 923 | _write_long(self._file, 0) |
| 924 | _write_long(self._file, 0) |
| 925 | |
| 926 | def _write_form_length(self, datalength): |
| 927 | if self._aifc: |
| 928 | commlength = 18 + 5 + len(self._compname) |
| 929 | if commlength & 1: |
| 930 | commlength = commlength + 1 |
| 931 | verslength = 12 |
| 932 | else: |
| 933 | commlength = 18 |
| 934 | verslength = 0 |
| 935 | _write_long(self._file, 4 + verslength + self._marklength + \ |
| 936 | 8 + commlength + 16 + datalength) |
| 937 | return commlength |
| 938 | |
| 939 | def _patchheader(self): |
| 940 | curpos = self._file.tell() |
| 941 | if self._datawritten & 1: |
| 942 | datalength = self._datawritten + 1 |
| 943 | self._file.write(chr(0)) |
| 944 | else: |
| 945 | datalength = self._datawritten |
| 946 | if datalength == self._datalength and \ |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 947 | self._nframes == self._nframeswritten and \ |
| 948 | self._marklength == 0: |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 949 | self._file.seek(curpos, 0) |
| 950 | return |
| 951 | self._file.seek(self._form_length_pos, 0) |
| 952 | dummy = self._write_form_length(datalength) |
| 953 | self._file.seek(self._nframes_pos, 0) |
| 954 | _write_long(self._file, self._nframeswritten) |
| 955 | self._file.seek(self._ssnd_length_pos, 0) |
| 956 | _write_long(self._file, datalength + 8) |
| 957 | self._file.seek(curpos, 0) |
| 958 | self._nframes = self._nframeswritten |
| 959 | self._datalength = datalength |
| 960 | |
| 961 | def _writemarkers(self): |
| 962 | if len(self._markers) == 0: |
| 963 | return |
| 964 | self._file.write('MARK') |
| 965 | length = 2 |
| 966 | for marker in self._markers: |
| 967 | id, pos, name = marker |
| 968 | length = length + len(name) + 1 + 6 |
| 969 | if len(name) & 1 == 0: |
| 970 | length = length + 1 |
| 971 | _write_long(self._file, length) |
| 972 | self._marklength = length + 8 |
Sjoerd Mullender | 7564a64 | 1993-01-22 14:26:28 +0000 | [diff] [blame] | 973 | _write_short(self._file, len(self._markers)) |
Sjoerd Mullender | eeabe7e | 1993-01-22 12:53:11 +0000 | [diff] [blame] | 974 | for marker in self._markers: |
| 975 | id, pos, name = marker |
| 976 | _write_short(self._file, id) |
| 977 | _write_long(self._file, pos) |
| 978 | _write_string(self._file, name) |
| 979 | |
| 980 | def open(filename, mode): |
| 981 | if mode == 'r': |
| 982 | return Aifc_read().init(filename) |
| 983 | elif mode == 'w': |
| 984 | return Aifc_write().init(filename) |
| 985 | else: |
| 986 | raise Error, 'mode must be \'r\' or \'w\'' |
| 987 | |
| 988 | def openfp(filep, mode): |
| 989 | if mode == 'r': |
| 990 | return Aifc_read().initfp(filep) |
| 991 | elif mode == 'w': |
| 992 | return Aifc_write().initfp(filep) |
| 993 | else: |
| 994 | raise Error, 'mode must be \'r\' or \'w\'' |