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/***************************************************************************
* __________ __ ___.
* 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;
}
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