From 9bd05b0bc5b2845f8fb474fd63ee26f64780ab8e Mon Sep 17 00:00:00 2001 From: Orgad Shaneh Date: Wed, 22 Nov 2023 11:26:28 +0200 Subject: [PATCH] Implement alaw2lin and ulaw2lin --- pydub/pyaudioop.py | 99 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 97 insertions(+), 2 deletions(-) diff --git a/pydub/pyaudioop.py b/pydub/pyaudioop.py index 9b1e2fbf..4b5236f6 100644 --- a/pydub/pyaudioop.py +++ b/pydub/pyaudioop.py @@ -529,12 +529,107 @@ def ratecv(cp, size, nchannels, inrate, outrate, state, weightA=1, weightB=0): d -= inrate +_to_lin_tables = { + # Source: https://github.com/python/cpython/blob/3.12/Modules/audioop.c#L91 + 'ulaw': [ + -32124, -31100, -30076, -29052, -28028, -27004, -25980, + -24956, -23932, -22908, -21884, -20860, -19836, -18812, + -17788, -16764, -15996, -15484, -14972, -14460, -13948, + -13436, -12924, -12412, -11900, -11388, -10876, -10364, + -9852, -9340, -8828, -8316, -7932, -7676, -7420, + -7164, -6908, -6652, -6396, -6140, -5884, -5628, + -5372, -5116, -4860, -4604, -4348, -4092, -3900, + -3772, -3644, -3516, -3388, -3260, -3132, -3004, + -2876, -2748, -2620, -2492, -2364, -2236, -2108, + -1980, -1884, -1820, -1756, -1692, -1628, -1564, + -1500, -1436, -1372, -1308, -1244, -1180, -1116, + -1052, -988, -924, -876, -844, -812, -780, + -748, -716, -684, -652, -620, -588, -556, + -524, -492, -460, -428, -396, -372, -356, + -340, -324, -308, -292, -276, -260, -244, + -228, -212, -196, -180, -164, -148, -132, + -120, -112, -104, -96, -88, -80, -72, + -64, -56, -48, -40, -32, -24, -16, + -8, 0, 32124, 31100, 30076, 29052, 28028, + 27004, 25980, 24956, 23932, 22908, 21884, 20860, + 19836, 18812, 17788, 16764, 15996, 15484, 14972, + 14460, 13948, 13436, 12924, 12412, 11900, 11388, + 10876, 10364, 9852, 9340, 8828, 8316, 7932, + 7676, 7420, 7164, 6908, 6652, 6396, 6140, + 5884, 5628, 5372, 5116, 4860, 4604, 4348, + 4092, 3900, 3772, 3644, 3516, 3388, 3260, + 3132, 3004, 2876, 2748, 2620, 2492, 2364, + 2236, 2108, 1980, 1884, 1820, 1756, 1692, + 1628, 1564, 1500, 1436, 1372, 1308, 1244, + 1180, 1116, 1052, 988, 924, 876, 844, + 812, 780, 748, 716, 684, 652, 620, + 588, 556, 524, 492, 460, 428, 396, + 372, 356, 340, 324, 308, 292, 276, + 260, 244, 228, 212, 196, 180, 164, + 148, 132, 120, 112, 104, 96, 88, + 80, 72, 64, 56, 48, 40, 32, + 24, 16, 8, 0 + ], + # Source: https://github.com/python/cpython/blob/3.12/Modules/audioop.c#L198 + 'alaw': [ + -5504, -5248, -6016, -5760, -4480, -4224, -4992, + -4736, -7552, -7296, -8064, -7808, -6528, -6272, + -7040, -6784, -2752, -2624, -3008, -2880, -2240, + -2112, -2496, -2368, -3776, -3648, -4032, -3904, + -3264, -3136, -3520, -3392, -22016, -20992, -24064, + -23040, -17920, -16896, -19968, -18944, -30208, -29184, + -32256, -31232, -26112, -25088, -28160, -27136, -11008, + -10496, -12032, -11520, -8960, -8448, -9984, -9472, + -15104, -14592, -16128, -15616, -13056, -12544, -14080, + -13568, -344, -328, -376, -360, -280, -264, + -312, -296, -472, -456, -504, -488, -408, + -392, -440, -424, -88, -72, -120, -104, + -24, -8, -56, -40, -216, -200, -248, + -232, -152, -136, -184, -168, -1376, -1312, + -1504, -1440, -1120, -1056, -1248, -1184, -1888, + -1824, -2016, -1952, -1632, -1568, -1760, -1696, + -688, -656, -752, -720, -560, -528, -624, + -592, -944, -912, -1008, -976, -816, -784, + -880, -848, 5504, 5248, 6016, 5760, 4480, + 4224, 4992, 4736, 7552, 7296, 8064, 7808, + 6528, 6272, 7040, 6784, 2752, 2624, 3008, + 2880, 2240, 2112, 2496, 2368, 3776, 3648, + 4032, 3904, 3264, 3136, 3520, 3392, 22016, + 20992, 24064, 23040, 17920, 16896, 19968, 18944, + 30208, 29184, 32256, 31232, 26112, 25088, 28160, + 27136, 11008, 10496, 12032, 11520, 8960, 8448, + 9984, 9472, 15104, 14592, 16128, 15616, 13056, + 12544, 14080, 13568, 344, 328, 376, 360, + 280, 264, 312, 296, 472, 456, 504, + 488, 408, 392, 440, 424, 88, 72, + 120, 104, 24, 8, 56, 40, 216, + 200, 248, 232, 152, 136, 184, 168, + 1376, 1312, 1504, 1440, 1120, 1056, 1248, + 1184, 1888, 1824, 2016, 1952, 1632, 1568, + 1760, 1696, 688, 656, 752, 720, 560, + 528, 624, 592, 944, 912, 1008, 976, + 816, 784, 880, 848 + ]} + + +_to_lin_table_bin = {} + + +def _to_lin(type, cp, size): + key = f'{type}:{size}' + if not key in _to_lin_table_bin: + _to_lin_table_bin[key] = [i.to_bytes( + size, byteorder='little', signed=True) for i in _to_lin_tables[type]] + table = _to_lin_table_bin[key] + return b''.join(table[val] for val in cp) + + def lin2ulaw(cp, size): raise NotImplementedError() def ulaw2lin(cp, size): - raise NotImplementedError() + return _to_lin('ulaw', cp, size) def lin2alaw(cp, size): @@ -542,7 +637,7 @@ def lin2alaw(cp, size): def alaw2lin(cp, size): - raise NotImplementedError() + return _to_lin('alaw', cp, size) def lin2adpcm(cp, size, state):