diff options
Diffstat (limited to 'Lib/sunau.py')
| -rw-r--r-- | Lib/sunau.py | 732 |
1 files changed, 366 insertions, 366 deletions
diff --git a/Lib/sunau.py b/Lib/sunau.py index 07f2784..0a40295 100644 --- a/Lib/sunau.py +++ b/Lib/sunau.py @@ -43,25 +43,25 @@ When the setpos() and rewind() methods are not used, the seek() method is not necessary. This returns an instance of a class with the following public methods: - getnchannels() -- returns number of audio channels (1 for - mono, 2 for stereo) - getsampwidth() -- returns sample width in bytes - getframerate() -- returns sampling frequency - getnframes() -- returns number of audio frames - getcomptype() -- returns compression type ('NONE' or 'ULAW') - getcompname() -- returns human-readable version of - compression type ('not compressed' matches 'NONE') - getparams() -- returns a tuple consisting of all of the - above in the above order - getmarkers() -- returns None (for compatibility with the - aifc module) - getmark(id) -- raises an error since the mark does not - exist (for compatibility with the aifc module) - readframes(n) -- returns at most n frames of audio - rewind() -- rewind to the beginning of the audio stream - setpos(pos) -- seek to the specified position - tell() -- return the current position - close() -- close the instance (make it unusable) + getnchannels() -- returns number of audio channels (1 for + mono, 2 for stereo) + getsampwidth() -- returns sample width in bytes + getframerate() -- returns sampling frequency + getnframes() -- returns number of audio frames + getcomptype() -- returns compression type ('NONE' or 'ULAW') + getcompname() -- returns human-readable version of + compression type ('not compressed' matches 'NONE') + getparams() -- returns a tuple consisting of all of the + above in the above order + getmarkers() -- returns None (for compatibility with the + aifc module) + getmark(id) -- raises an error since the mark does not + exist (for compatibility with the aifc module) + readframes(n) -- returns at most n frames of audio + rewind() -- rewind to the beginning of the audio stream + setpos(pos) -- seek to the specified position + tell() -- return the current position + close() -- close the instance (make it unusable) The position returned by tell() and the position given to setpos() are compatible and have nothing to do with the actual position in the file. @@ -75,22 +75,22 @@ The open file pointer must have methods write(), tell(), seek(), and close(). This returns an instance of a class with the following public methods: - setnchannels(n) -- set the number of channels - setsampwidth(n) -- set the sample width - setframerate(n) -- set the frame rate - setnframes(n) -- set the number of frames + setnchannels(n) -- set the number of channels + setsampwidth(n) -- set the sample width + setframerate(n) -- set the frame rate + setnframes(n) -- set the number of frames setcomptype(type, name) - -- set the compression type and the - human-readable compression type + -- set the compression type and the + human-readable compression type setparams(tuple)-- set all parameters at once - tell() -- return current position in output file + tell() -- return current position in output file writeframesraw(data) - -- write audio frames without pathing up the - file header + -- write audio frames without pathing up the + file header writeframes(data) - -- write audio frames and patch up the file header - close() -- patch up the file header and close the - output file + -- write audio frames and patch up the file header + close() -- patch up the file header and close the + output file You should set the parameters before the first writeframesraw or writeframes. The total number of frames does not need to be set, but when it is set to the correct value, the header does not have to @@ -119,356 +119,356 @@ AUDIO_FILE_ENCODING_ADPCM_G723_5 = 26 AUDIO_FILE_ENCODING_ALAW_8 = 27 # from <multimedia/audio_hdr.h> -AUDIO_UNKNOWN_SIZE = 0xFFFFFFFFL # ((unsigned)(~0)) +AUDIO_UNKNOWN_SIZE = 0xFFFFFFFFL # ((unsigned)(~0)) _simple_encodings = [AUDIO_FILE_ENCODING_MULAW_8, - AUDIO_FILE_ENCODING_LINEAR_8, - AUDIO_FILE_ENCODING_LINEAR_16, - AUDIO_FILE_ENCODING_LINEAR_24, - AUDIO_FILE_ENCODING_LINEAR_32, - AUDIO_FILE_ENCODING_ALAW_8] + AUDIO_FILE_ENCODING_LINEAR_8, + AUDIO_FILE_ENCODING_LINEAR_16, + AUDIO_FILE_ENCODING_LINEAR_24, + AUDIO_FILE_ENCODING_LINEAR_32, + AUDIO_FILE_ENCODING_ALAW_8] class Error(Exception): - pass + pass def _read_u32(file): - x = 0L - for i in range(4): - byte = file.read(1) - if byte == '': - raise EOFError - x = x*256 + ord(byte) - return x + x = 0L + for i in range(4): + byte = file.read(1) + if byte == '': + raise EOFError + x = x*256 + ord(byte) + return x def _write_u32(file, x): - data = [] - for i in range(4): - d, m = divmod(x, 256) - data.insert(0, m) - x = d - for i in range(4): - file.write(chr(int(data[i]))) + data = [] + for i in range(4): + d, m = divmod(x, 256) + data.insert(0, m) + x = d + for i in range(4): + file.write(chr(int(data[i]))) class Au_read: - def __init__(self, f): - if type(f) == type(''): - import __builtin__ - f = __builtin__.open(f, 'rb') - self.initfp(f) - - def __del__(self): - if self._file: - self.close() - - def initfp(self, file): - self._file = file - self._soundpos = 0 - magic = int(_read_u32(file)) - if magic != AUDIO_FILE_MAGIC: - raise Error, 'bad magic number' - self._hdr_size = int(_read_u32(file)) - if self._hdr_size < 24: - raise Error, 'header size too small' - if self._hdr_size > 100: - raise Error, 'header size ridiculously large' - self._data_size = _read_u32(file) - if self._data_size != AUDIO_UNKNOWN_SIZE: - self._data_size = int(self._data_size) - self._encoding = int(_read_u32(file)) - if self._encoding not in _simple_encodings: - raise Error, 'encoding not (yet) supported' - if self._encoding in (AUDIO_FILE_ENCODING_MULAW_8, - AUDIO_FILE_ENCODING_ALAW_8): - self._sampwidth = 2 - self._framesize = 1 - elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_8: - self._framesize = self._sampwidth = 1 - elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_16: - self._framesize = self._sampwidth = 2 - elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_24: - self._framesize = self._sampwidth = 3 - elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_32: - self._framesize = self._sampwidth = 4 - else: - raise Error, 'unknown encoding' - self._framerate = int(_read_u32(file)) - self._nchannels = int(_read_u32(file)) - self._framesize = self._framesize * self._nchannels - if self._hdr_size > 24: - self._info = file.read(self._hdr_size - 24) - for i in range(len(self._info)): - if self._info[i] == '\0': - self._info = self._info[:i] - break - else: - self._info = '' - - def getfp(self): - return self._file - - def getnchannels(self): - return self._nchannels - - def getsampwidth(self): - return self._sampwidth - - def getframerate(self): - return self._framerate - - def getnframes(self): - if self._data_size == AUDIO_UNKNOWN_SIZE: - return AUDIO_UNKNOWN_SIZE - if self._encoding in _simple_encodings: - return self._data_size / self._framesize - return 0 # XXX--must do some arithmetic here - - def getcomptype(self): - if self._encoding == AUDIO_FILE_ENCODING_MULAW_8: - return 'ULAW' - elif self._encoding == AUDIO_FILE_ENCODING_ALAW_8: - return 'ALAW' - else: - return 'NONE' - - def getcompname(self): - if self._encoding == AUDIO_FILE_ENCODING_MULAW_8: - return 'CCITT G.711 u-law' - elif self._encoding == AUDIO_FILE_ENCODING_ALAW_8: - return 'CCITT G.711 A-law' - else: - return 'not compressed' - - def getparams(self): - return self.getnchannels(), self.getsampwidth(), \ - self.getframerate(), self.getnframes(), \ - self.getcomptype(), self.getcompname() - - def getmarkers(self): - return None - - def getmark(self, id): - raise Error, 'no marks' - - def readframes(self, nframes): - if self._encoding in _simple_encodings: - if nframes == AUDIO_UNKNOWN_SIZE: - data = self._file.read() - else: - data = self._file.read(nframes * self._framesize * self._nchannels) - if self._encoding == AUDIO_FILE_ENCODING_MULAW_8: - import audioop - data = audioop.ulaw2lin(data, self._sampwidth) - return data - return None # XXX--not implemented yet - - def rewind(self): - self._soundpos = 0 - self._file.seek(self._hdr_size) - - def tell(self): - return self._soundpos - - def setpos(self, pos): - if pos < 0 or pos > self.getnframes(): - raise Error, 'position not in range' - self._file.seek(pos * self._framesize + self._hdr_size) - self._soundpos = pos - - def close(self): - self._file = None + def __init__(self, f): + if type(f) == type(''): + import __builtin__ + f = __builtin__.open(f, 'rb') + self.initfp(f) + + def __del__(self): + if self._file: + self.close() + + def initfp(self, file): + self._file = file + self._soundpos = 0 + magic = int(_read_u32(file)) + if magic != AUDIO_FILE_MAGIC: + raise Error, 'bad magic number' + self._hdr_size = int(_read_u32(file)) + if self._hdr_size < 24: + raise Error, 'header size too small' + if self._hdr_size > 100: + raise Error, 'header size ridiculously large' + self._data_size = _read_u32(file) + if self._data_size != AUDIO_UNKNOWN_SIZE: + self._data_size = int(self._data_size) + self._encoding = int(_read_u32(file)) + if self._encoding not in _simple_encodings: + raise Error, 'encoding not (yet) supported' + if self._encoding in (AUDIO_FILE_ENCODING_MULAW_8, + AUDIO_FILE_ENCODING_ALAW_8): + self._sampwidth = 2 + self._framesize = 1 + elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_8: + self._framesize = self._sampwidth = 1 + elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_16: + self._framesize = self._sampwidth = 2 + elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_24: + self._framesize = self._sampwidth = 3 + elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_32: + self._framesize = self._sampwidth = 4 + else: + raise Error, 'unknown encoding' + self._framerate = int(_read_u32(file)) + self._nchannels = int(_read_u32(file)) + self._framesize = self._framesize * self._nchannels + if self._hdr_size > 24: + self._info = file.read(self._hdr_size - 24) + for i in range(len(self._info)): + if self._info[i] == '\0': + self._info = self._info[:i] + break + else: + self._info = '' + + def getfp(self): + return self._file + + def getnchannels(self): + return self._nchannels + + def getsampwidth(self): + return self._sampwidth + + def getframerate(self): + return self._framerate + + def getnframes(self): + if self._data_size == AUDIO_UNKNOWN_SIZE: + return AUDIO_UNKNOWN_SIZE + if self._encoding in _simple_encodings: + return self._data_size / self._framesize + return 0 # XXX--must do some arithmetic here + + def getcomptype(self): + if self._encoding == AUDIO_FILE_ENCODING_MULAW_8: + return 'ULAW' + elif self._encoding == AUDIO_FILE_ENCODING_ALAW_8: + return 'ALAW' + else: + return 'NONE' + + def getcompname(self): + if self._encoding == AUDIO_FILE_ENCODING_MULAW_8: + return 'CCITT G.711 u-law' + elif self._encoding == AUDIO_FILE_ENCODING_ALAW_8: + return 'CCITT G.711 A-law' + else: + return 'not compressed' + + def getparams(self): + return self.getnchannels(), self.getsampwidth(), \ + self.getframerate(), self.getnframes(), \ + self.getcomptype(), self.getcompname() + + def getmarkers(self): + return None + + def getmark(self, id): + raise Error, 'no marks' + + def readframes(self, nframes): + if self._encoding in _simple_encodings: + if nframes == AUDIO_UNKNOWN_SIZE: + data = self._file.read() + else: + data = self._file.read(nframes * self._framesize * self._nchannels) + if self._encoding == AUDIO_FILE_ENCODING_MULAW_8: + import audioop + data = audioop.ulaw2lin(data, self._sampwidth) + return data + return None # XXX--not implemented yet + + def rewind(self): + self._soundpos = 0 + self._file.seek(self._hdr_size) + + def tell(self): + return self._soundpos + + def setpos(self, pos): + if pos < 0 or pos > self.getnframes(): + raise Error, 'position not in range' + self._file.seek(pos * self._framesize + self._hdr_size) + self._soundpos = pos + + def close(self): + self._file = None class Au_write: - def __init__(self, f): - if type(f) == type(''): - import __builtin__ - f = __builtin__.open(f, 'wb') - self.initfp(f) - - def __del__(self): - if self._file: - self.close() - - def initfp(self, file): - self._file = file - self._framerate = 0 - self._nchannels = 0 - self._sampwidth = 0 - self._framesize = 0 - self._nframes = AUDIO_UNKNOWN_SIZE - self._nframeswritten = 0 - self._datawritten = 0 - self._datalength = 0 - self._info = '' - self._comptype = 'ULAW' # default is U-law - - def setnchannels(self, nchannels): - if self._nframeswritten: - raise Error, 'cannot change parameters after starting to write' - if nchannels not in (1, 2, 4): - raise Error, 'only 1, 2, or 4 channels supported' - self._nchannels = nchannels - - def getnchannels(self): - if not self._nchannels: - raise Error, 'number of channels not set' - return self._nchannels - - def setsampwidth(self, sampwidth): - if self._nframeswritten: - raise Error, 'cannot change parameters after starting to write' - if sampwidth not in (1, 2, 4): - raise Error, 'bad sample width' - self._sampwidth = sampwidth - - def getsampwidth(self): - if not self._framerate: - raise Error, 'sample width not specified' - return self._sampwidth - - def setframerate(self, framerate): - if self._nframeswritten: - raise Error, 'cannot change parameters after starting to write' - self._framerate = framerate - - def getframerate(self): - if not self._framerate: - raise Error, 'frame rate not set' - return self._framerate - - def setnframes(self, nframes): - if self._nframeswritten: - raise Error, 'cannot change parameters after starting to write' - if nframes < 0: - raise Error, '# of frames cannot be negative' - self._nframes = nframes - - def getnframes(self): - return self._nframeswritten - - def setcomptype(self, type, name): - if type in ('NONE', 'ULAW'): - self._comptype = type - else: - raise Error, 'unknown compression type' - - def getcomptype(self): - return self._comptype - - def getcompname(self): - if self._comptype == 'ULAW': - return 'CCITT G.711 u-law' - elif self._comptype == 'ALAW': - return 'CCITT G.711 A-law' - else: - return 'not compressed' - - def setparams(self, (nchannels, sampwidth, framerate, nframes, comptype, compname)): - self.setnchannels(nchannels) - self.setsampwidth(sampwidth) - self.setframerate(framerate) - self.setnframes(nframes) - self.setcomptype(comptype, compname) - - def getparams(self): - return self.getnchannels(), self.getsampwidth(), \ - self.getframerate(), self.getnframes(), \ - self.getcomptype(), self.getcompname() - - def tell(self): - return self._nframeswritten - - def writeframesraw(self, data): - self._ensure_header_written() - nframes = len(data) / self._framesize - if self._comptype == 'ULAW': - import audioop - data = audioop.lin2ulaw(data, self._sampwidth) - self._file.write(data) - self._nframeswritten = self._nframeswritten + nframes - self._datawritten = self._datawritten + len(data) - - def writeframes(self, data): - self.writeframesraw(data) - if self._nframeswritten != self._nframes or \ - self._datalength != self._datawritten: - self._patchheader() - - def close(self): - self._ensure_header_written() - if self._nframeswritten != self._nframes or \ - self._datalength != self._datawritten: - self._patchheader() - self._file.flush() - self._file = None - - # - # private methods - # - - def _ensure_header_written(self): - if not self._nframeswritten: - if not self._nchannels: - raise Error, '# of channels not specified' - if not self._sampwidth: - raise Error, 'sample width not specified' - if not self._framerate: - raise Error, 'frame rate not specified' - self._write_header() - - def _write_header(self): - if self._comptype == 'NONE': - if self._sampwidth == 1: - encoding = AUDIO_FILE_ENCODING_LINEAR_8 - self._framesize = 1 - elif self._sampwidth == 2: - encoding = AUDIO_FILE_ENCODING_LINEAR_16 - self._framesize = 2 - elif self._sampwidth == 4: - encoding = AUDIO_FILE_ENCODING_LINEAR_32 - self._framesize = 4 - else: - raise Error, 'internal error' - elif self._comptype == 'ULAW': - encoding = AUDIO_FILE_ENCODING_MULAW_8 - self._framesize = 1 - else: - raise Error, 'internal error' - self._framesize = self._framesize * self._nchannels - _write_u32(self._file, AUDIO_FILE_MAGIC) - header_size = 25 + len(self._info) - header_size = (header_size + 7) & ~7 - _write_u32(self._file, header_size) - if self._nframes == AUDIO_UNKNOWN_SIZE: - length = AUDIO_UNKNOWN_SIZE - else: - length = self._nframes * self._framesize - _write_u32(self._file, length) - self._datalength = length - _write_u32(self._file, encoding) - _write_u32(self._file, self._framerate) - _write_u32(self._file, self._nchannels) - self._file.write(self._info) - self._file.write('\0'*(header_size - len(self._info) - 24)) - - def _patchheader(self): - self._file.seek(8) - _write_u32(self._file, self._datawritten) - self._datalength = self._datawritten - self._file.seek(0, 2) + def __init__(self, f): + if type(f) == type(''): + import __builtin__ + f = __builtin__.open(f, 'wb') + self.initfp(f) + + def __del__(self): + if self._file: + self.close() + + def initfp(self, file): + self._file = file + self._framerate = 0 + self._nchannels = 0 + self._sampwidth = 0 + self._framesize = 0 + self._nframes = AUDIO_UNKNOWN_SIZE + self._nframeswritten = 0 + self._datawritten = 0 + self._datalength = 0 + self._info = '' + self._comptype = 'ULAW' # default is U-law + + def setnchannels(self, nchannels): + if self._nframeswritten: + raise Error, 'cannot change parameters after starting to write' + if nchannels not in (1, 2, 4): + raise Error, 'only 1, 2, or 4 channels supported' + self._nchannels = nchannels + + def getnchannels(self): + if not self._nchannels: + raise Error, 'number of channels not set' + return self._nchannels + + def setsampwidth(self, sampwidth): + if self._nframeswritten: + raise Error, 'cannot change parameters after starting to write' + if sampwidth not in (1, 2, 4): + raise Error, 'bad sample width' + self._sampwidth = sampwidth + + def getsampwidth(self): + if not self._framerate: + raise Error, 'sample width not specified' + return self._sampwidth + + def setframerate(self, framerate): + if self._nframeswritten: + raise Error, 'cannot change parameters after starting to write' + self._framerate = framerate + + def getframerate(self): + if not self._framerate: + raise Error, 'frame rate not set' + return self._framerate + + def setnframes(self, nframes): + if self._nframeswritten: + raise Error, 'cannot change parameters after starting to write' + if nframes < 0: + raise Error, '# of frames cannot be negative' + self._nframes = nframes + + def getnframes(self): + return self._nframeswritten + + def setcomptype(self, type, name): + if type in ('NONE', 'ULAW'): + self._comptype = type + else: + raise Error, 'unknown compression type' + + def getcomptype(self): + return self._comptype + + def getcompname(self): + if self._comptype == 'ULAW': + return 'CCITT G.711 u-law' + elif self._comptype == 'ALAW': + return 'CCITT G.711 A-law' + else: + return 'not compressed' + + def setparams(self, (nchannels, sampwidth, framerate, nframes, comptype, compname)): + self.setnchannels(nchannels) + self.setsampwidth(sampwidth) + self.setframerate(framerate) + self.setnframes(nframes) + self.setcomptype(comptype, compname) + + def getparams(self): + return self.getnchannels(), self.getsampwidth(), \ + self.getframerate(), self.getnframes(), \ + self.getcomptype(), self.getcompname() + + def tell(self): + return self._nframeswritten + + def writeframesraw(self, data): + self._ensure_header_written() + nframes = len(data) / self._framesize + if self._comptype == 'ULAW': + import audioop + data = audioop.lin2ulaw(data, self._sampwidth) + self._file.write(data) + self._nframeswritten = self._nframeswritten + nframes + self._datawritten = self._datawritten + len(data) + + def writeframes(self, data): + self.writeframesraw(data) + if self._nframeswritten != self._nframes or \ + self._datalength != self._datawritten: + self._patchheader() + + def close(self): + self._ensure_header_written() + if self._nframeswritten != self._nframes or \ + self._datalength != self._datawritten: + self._patchheader() + self._file.flush() + self._file = None + + # + # private methods + # + + def _ensure_header_written(self): + if not self._nframeswritten: + if not self._nchannels: + raise Error, '# of channels not specified' + if not self._sampwidth: + raise Error, 'sample width not specified' + if not self._framerate: + raise Error, 'frame rate not specified' + self._write_header() + + def _write_header(self): + if self._comptype == 'NONE': + if self._sampwidth == 1: + encoding = AUDIO_FILE_ENCODING_LINEAR_8 + self._framesize = 1 + elif self._sampwidth == 2: + encoding = AUDIO_FILE_ENCODING_LINEAR_16 + self._framesize = 2 + elif self._sampwidth == 4: + encoding = AUDIO_FILE_ENCODING_LINEAR_32 + self._framesize = 4 + else: + raise Error, 'internal error' + elif self._comptype == 'ULAW': + encoding = AUDIO_FILE_ENCODING_MULAW_8 + self._framesize = 1 + else: + raise Error, 'internal error' + self._framesize = self._framesize * self._nchannels + _write_u32(self._file, AUDIO_FILE_MAGIC) + header_size = 25 + len(self._info) + header_size = (header_size + 7) & ~7 + _write_u32(self._file, header_size) + if self._nframes == AUDIO_UNKNOWN_SIZE: + length = AUDIO_UNKNOWN_SIZE + else: + length = self._nframes * self._framesize + _write_u32(self._file, length) + self._datalength = length + _write_u32(self._file, encoding) + _write_u32(self._file, self._framerate) + _write_u32(self._file, self._nchannels) + self._file.write(self._info) + self._file.write('\0'*(header_size - len(self._info) - 24)) + + def _patchheader(self): + self._file.seek(8) + _write_u32(self._file, self._datawritten) + self._datalength = self._datawritten + self._file.seek(0, 2) def open(f, mode=None): - if mode is None: - if hasattr(f, 'mode'): - mode = f.mode - else: - mode = 'rb' - if mode in ('r', 'rb'): - return Au_read(f) - elif mode in ('w', 'wb'): - return Au_write(f) - else: - raise Error, "mode must be 'r', 'rb', 'w', or 'wb'" + if mode is None: + if hasattr(f, 'mode'): + mode = f.mode + else: + mode = 'rb' + if mode in ('r', 'rb'): + return Au_read(f) + elif mode in ('w', 'wb'): + return Au_write(f) + else: + raise Error, "mode must be 'r', 'rb', 'w', or 'wb'" openfp = open |