From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001 From: Sean Bartell Date: Sat, 25 Jun 2011 21:32:25 -0400 Subject: Add codecs to librbcodec. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius Tested-by: Nils Wallménius --- lib/rbcodec/codecs/libpcm/itut_g711.c | 204 ++++++++++++++++++++++++++++++++++ 1 file changed, 204 insertions(+) create mode 100644 lib/rbcodec/codecs/libpcm/itut_g711.c (limited to 'lib/rbcodec/codecs/libpcm/itut_g711.c') diff --git a/lib/rbcodec/codecs/libpcm/itut_g711.c b/lib/rbcodec/codecs/libpcm/itut_g711.c new file mode 100644 index 0000000000..88ff5f59e6 --- /dev/null +++ b/lib/rbcodec/codecs/libpcm/itut_g711.c @@ -0,0 +1,204 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2005 Dave Chapman + * Copyright (C) 2009 Yoshihisa Uchida + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ +#include "codeclib.h" +#include "support_formats.h" + +/* + * ITU-T G.711 A-law mu-law + */ + +static const int16_t alaw2linear16[256] ICONST_ATTR = { + -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 +}; + +static const int16_t ulaw2linear16[256] ICONST_ATTR = { + -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 struct pcm_format *fmt; + +static bool set_format(struct pcm_format *format) +{ + fmt = format; + + if (fmt->channels == 0) + { + DEBUGF("CODEC_ERROR: channels is 0\n"); + return false; + } + + if (fmt->bitspersample != 8) + { + DEBUGF("CODEC_ERROR: alaw and mulaw must have 8 bitspersample: %d\n", + fmt->bitspersample); + return false; + } + + fmt->bytespersample = 1; + + if (fmt->blockalign == 0) + fmt->blockalign = fmt->channels; + + fmt->samplesperblock = fmt->blockalign / fmt->channels; + + /* chunksize = about 1/50[sec] data */ + fmt->chunksize = (ci->id3->frequency / (50 * fmt->samplesperblock)) + * fmt->blockalign; + + return true; +} + +static struct pcm_pos *get_seek_pos(uint32_t seek_val, int seek_mode, + uint8_t *(*read_buffer)(size_t *realsize)) +{ + static struct pcm_pos newpos; + uint32_t newblock = (seek_mode == PCM_SEEK_TIME) ? + ((uint64_t)seek_val * ci->id3->frequency / 1000LL) + / fmt->samplesperblock : + seek_val / fmt->blockalign; + + (void)read_buffer; + newpos.pos = newblock * fmt->blockalign; + newpos.samples = newblock * fmt->samplesperblock; + return &newpos; +} + +static int decode_alaw(const uint8_t *inbuf, size_t inbufsize, + int32_t *outbuf, int *outbufsize) +{ + uint32_t i; + + for (i = 0; i < inbufsize; i++) + outbuf[i] = alaw2linear16[inbuf[i]] << (PCM_OUTPUT_DEPTH - 16); + + *outbufsize = (fmt->channels == 2) ? (inbufsize >> 1) : inbufsize; + + return CODEC_OK; +} + +static int decode_mulaw(const uint8_t *inbuf, size_t inbufsize, + int32_t *outbuf, int *outbufsize) +{ + uint32_t i; + + for (i = 0; i < inbufsize; i++) + outbuf[i] = ulaw2linear16[inbuf[i]] << (PCM_OUTPUT_DEPTH - 16); + + *outbufsize = (fmt->channels == 2) ? (inbufsize >> 1) : inbufsize; + + return CODEC_OK; +} + +static const struct pcm_codec alaw_codec = { + set_format, + get_seek_pos, + decode_alaw, + }; + +static const struct pcm_codec mulaw_codec = { + set_format, + get_seek_pos, + decode_mulaw, + }; + +const struct pcm_codec *get_itut_g711_alaw_codec(void) +{ + return &alaw_codec; +} + +const struct pcm_codec *get_itut_g711_mulaw_codec(void) +{ + return &mulaw_codec; +} + -- cgit v1.2.3