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1 """Convert "arbitrary" sound files to AIFF (Apple and SGI's audio format). |
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2 |
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3 Input may be compressed. |
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4 Uncompressed file type may be AIFF, WAV, VOC, 8SVX, NeXT/Sun, and others. |
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5 An exception is raised if the file is not of a recognized type. |
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6 Returned filename is either the input filename or a temporary filename; |
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7 in the latter case the caller must ensure that it is removed. |
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8 Other temporary files used are removed by the function. |
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9 """ |
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10 from warnings import warnpy3k |
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11 warnpy3k("the toaiff module has been removed in Python 3.0", stacklevel=2) |
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12 del warnpy3k |
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13 |
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14 import os |
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15 import tempfile |
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16 import pipes |
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17 import sndhdr |
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18 |
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19 __all__ = ["error", "toaiff"] |
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20 |
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21 table = {} |
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22 |
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23 t = pipes.Template() |
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24 t.append('sox -t au - -t aiff -r 8000 -', '--') |
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25 table['au'] = t |
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26 |
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27 # XXX The following is actually sub-optimal. |
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28 # XXX The HCOM sampling rate can be 22k, 22k/2, 22k/3 or 22k/4. |
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29 # XXX We must force the output sampling rate else the SGI won't play |
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30 # XXX files sampled at 5.5k or 7.333k; however this means that files |
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31 # XXX sampled at 11k are unnecessarily expanded. |
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32 # XXX Similar comments apply to some other file types. |
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33 t = pipes.Template() |
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34 t.append('sox -t hcom - -t aiff -r 22050 -', '--') |
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35 table['hcom'] = t |
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36 |
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37 t = pipes.Template() |
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38 t.append('sox -t voc - -t aiff -r 11025 -', '--') |
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39 table['voc'] = t |
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40 |
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41 t = pipes.Template() |
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42 t.append('sox -t wav - -t aiff -', '--') |
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43 table['wav'] = t |
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44 |
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45 t = pipes.Template() |
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46 t.append('sox -t 8svx - -t aiff -r 16000 -', '--') |
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47 table['8svx'] = t |
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48 |
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49 t = pipes.Template() |
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50 t.append('sox -t sndt - -t aiff -r 16000 -', '--') |
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51 table['sndt'] = t |
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52 |
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53 t = pipes.Template() |
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54 t.append('sox -t sndr - -t aiff -r 16000 -', '--') |
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55 table['sndr'] = t |
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56 |
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57 uncompress = pipes.Template() |
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58 uncompress.append('uncompress', '--') |
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59 |
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60 |
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61 class error(Exception): |
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62 pass |
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63 |
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64 def toaiff(filename): |
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65 temps = [] |
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66 ret = None |
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67 try: |
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68 ret = _toaiff(filename, temps) |
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69 finally: |
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70 for temp in temps[:]: |
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71 if temp != ret: |
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72 try: |
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73 os.unlink(temp) |
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74 except os.error: |
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75 pass |
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76 temps.remove(temp) |
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77 return ret |
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78 |
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79 def _toaiff(filename, temps): |
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80 if filename[-2:] == '.Z': |
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81 (fd, fname) = tempfile.mkstemp() |
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82 os.close(fd) |
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83 temps.append(fname) |
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84 sts = uncompress.copy(filename, fname) |
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85 if sts: |
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86 raise error, filename + ': uncompress failed' |
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87 else: |
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88 fname = filename |
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89 try: |
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90 ftype = sndhdr.whathdr(fname) |
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91 if ftype: |
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92 ftype = ftype[0] # All we're interested in |
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93 except IOError, msg: |
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94 if type(msg) == type(()) and len(msg) == 2 and \ |
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95 type(msg[0]) == type(0) and type(msg[1]) == type(''): |
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96 msg = msg[1] |
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97 if type(msg) != type(''): |
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98 msg = repr(msg) |
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99 raise error, filename + ': ' + msg |
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100 if ftype == 'aiff': |
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101 return fname |
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102 if ftype is None or not ftype in table: |
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103 raise error, '%s: unsupported audio file type %r' % (filename, ftype) |
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104 (fd, temp) = tempfile.mkstemp() |
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105 os.close(fd) |
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106 temps.append(temp) |
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107 sts = table[ftype].copy(fname, temp) |
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108 if sts: |
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109 raise error, filename + ': conversion to aiff failed' |
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110 return temp |