diff options
Diffstat (limited to 'plugins/codecs/G711/G711decode.c')
| -rw-r--r-- | plugins/codecs/G711/G711decode.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/plugins/codecs/G711/G711decode.c b/plugins/codecs/G711/G711decode.c new file mode 100644 index 00000000..e15c4076 --- /dev/null +++ b/plugins/codecs/G711/G711decode.c @@ -0,0 +1,202 @@ +/* G711adecode.c + * A-law G.711 codec + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "config.h" + +#include <glib.h> + +#include "wsutil/codecs.h" +#include "ws_attributes.h" + +static gint16 ulaw_exp_table[256] = { + -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 +}; + +static gint16 alaw_exp_table[256] = { + -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 +}; + +void codec_register_g711(void); + +static void * +codec_g711u_init(codec_context_t *ctx _U_) +{ + return NULL; +} + +static void +codec_g711u_release(codec_context_t *ctx _U_) +{ + +} + +static unsigned +codec_g711u_get_channels(codec_context_t *ctx _U_) +{ + return 1; +} + +static unsigned +codec_g711u_get_frequency(codec_context_t *ctx _U_) +{ + return 8000; +} + +static size_t +codec_g711u_decode(codec_context_t *ctx _U_, + const void *inputBytes, size_t inputBytesSize, + void *outputSamples, size_t *outputSamplesSize) +{ + const guint8 *dataIn = (const guint8 *) inputBytes; + gint16 *dataOut = (gint16 *) outputSamples; + size_t i; + + if (!outputSamples || !outputSamplesSize) { + return inputBytesSize * 2; + } + + for (i = 0; i < inputBytesSize; i++) + { + dataOut[i] = ulaw_exp_table[dataIn[i]]; + } + + *outputSamplesSize = inputBytesSize * 2; + return inputBytesSize * 2; +} + +static void * +codec_g711a_init(codec_context_t *ctx _U_) +{ + return NULL; +} + +static void +codec_g711a_release(codec_context_t *ctx _U_) +{ + +} + +static unsigned +codec_g711a_get_channels(codec_context_t *ctx _U_) +{ + return 1; +} + +static unsigned +codec_g711a_get_frequency(codec_context_t *ctx _U_) +{ + return 8000; +} + +static size_t +codec_g711a_decode(codec_context_t *ctx _U_, + const void *inputBytes, size_t inputBytesSize, + void *outputSamples, size_t *outputSamplesSize) +{ + const guint8 *dataIn = (const guint8 *) inputBytes; + gint16 *dataOut = (gint16 *) outputSamples; + size_t i; + + if (!outputSamples || !outputSamplesSize) { + return inputBytesSize * 2; + } + + for (i = 0; i < inputBytesSize; i++) + { + dataOut[i] = alaw_exp_table[dataIn[i]]; + } + + *outputSamplesSize = inputBytesSize * 2; + return inputBytesSize * 2; +} + +void +codec_register_g711(void) +{ + register_codec("g711U", codec_g711u_init, codec_g711u_release, + codec_g711u_get_channels, codec_g711u_get_frequency, codec_g711u_decode); + register_codec("g711A", codec_g711a_init, codec_g711a_release, + codec_g711a_get_channels, codec_g711a_get_frequency, codec_g711a_decode); +} + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 4 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + * + * vi: set shiftwidth=4 tabstop=8 expandtab: + * :indentSize=4:tabSize=8:noTabs=true: + */ |