/
adpcm.c
2398 lines (2150 loc) · 94.2 KB
/
adpcm.c
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/*
* Copyright (c) 2001-2003 The FFmpeg project
*
* first version by Francois Revol (revol@free.fr)
* fringe ADPCM codecs (e.g., DK3, DK4, Westwood)
* by Mike Melanson (melanson@pcisys.net)
* CD-ROM XA ADPCM codec by BERO
* EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)
* EA ADPCM R1/R2/R3 decoder by Peter Ross (pross@xvid.org)
* EA IMA EACS decoder by Peter Ross (pross@xvid.org)
* EA IMA SEAD decoder by Peter Ross (pross@xvid.org)
* EA ADPCM XAS decoder by Peter Ross (pross@xvid.org)
* MAXIS EA ADPCM decoder by Robert Marston (rmarston@gmail.com)
* THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)
* Argonaut Games ADPCM decoder by Zane van Iperen (zane@zanevaniperen.com)
* Simon & Schuster Interactive ADPCM decoder by Zane van Iperen (zane@zanevaniperen.com)
* Ubisoft ADPCM decoder by Zane van Iperen (zane@zanevaniperen.com)
* High Voltage Software ALP decoder by Zane van Iperen (zane@zanevaniperen.com)
* Cunning Developments decoder by Zane van Iperen (zane@zanevaniperen.com)
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config_components.h"
#include "avcodec.h"
#include "get_bits.h"
#include "bytestream.h"
#include "adpcm.h"
#include "adpcm_data.h"
#include "codec_internal.h"
#include "decode.h"
/**
* @file
* ADPCM decoders
* Features and limitations:
*
* Reference documents:
* http://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs
* http://www.pcisys.net/~melanson/codecs/simpleaudio.html [dead]
* http://www.geocities.com/SiliconValley/8682/aud3.txt [dead]
* http://openquicktime.sourceforge.net/
* XAnim sources (xa_codec.c) http://xanim.polter.net/
* http://www.cs.ucla.edu/~leec/mediabench/applications.html [dead]
* SoX source code http://sox.sourceforge.net/
*
* CD-ROM XA:
* http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html [dead]
* vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html [dead]
* readstr http://www.geocities.co.jp/Playtown/2004/
*/
#define CASE_0(codec_id, ...)
#define CASE_1(codec_id, ...) \
case codec_id: \
{ __VA_ARGS__ } \
break;
#define CASE_2(enabled, codec_id, ...) \
CASE_ ## enabled(codec_id, __VA_ARGS__)
#define CASE_3(config, codec_id, ...) \
CASE_2(config, codec_id, __VA_ARGS__)
#define CASE(codec, ...) \
CASE_3(CONFIG_ ## codec ## _DECODER, AV_CODEC_ID_ ## codec, __VA_ARGS__)
/* These are for CD-ROM XA ADPCM */
static const int8_t xa_adpcm_table[5][2] = {
{ 0, 0 },
{ 60, 0 },
{ 115, -52 },
{ 98, -55 },
{ 122, -60 }
};
static const int16_t afc_coeffs[2][16] = {
{ 0, 2048, 0, 1024, 4096, 3584, 3072, 4608, 4200, 4800, 5120, 2048, 1024, -1024, -1024, -2048 },
{ 0, 0, 2048, 1024, -2048, -1536, -1024, -2560, -2248, -2300, -3072, -2048, -1024, 1024, 0, 0 }
};
static const int16_t ea_adpcm_table[] = {
0, 240, 460, 392,
0, 0, -208, -220,
0, 1, 3, 4,
7, 8, 10, 11,
0, -1, -3, -4
};
/*
* Dumped from the binaries:
* - FantasticJourney.exe - 0x794D2, DGROUP:0x47A4D2
* - BigRaceUSA.exe - 0x9B8AA, DGROUP:0x49C4AA
* - Timeshock!.exe - 0x8506A, DGROUP:0x485C6A
*/
static const int8_t ima_cunning_index_table[9] = {
-1, -1, -1, -1, 1, 2, 3, 4, -1
};
/*
* Dumped from the binaries:
* - FantasticJourney.exe - 0x79458, DGROUP:0x47A458
* - BigRaceUSA.exe - 0x9B830, DGROUP:0x49C430
* - Timeshock!.exe - 0x84FF0, DGROUP:0x485BF0
*/
static const int16_t ima_cunning_step_table[61] = {
1, 1, 1, 1, 2, 2, 3, 3, 4, 5,
6, 7, 8, 10, 12, 14, 16, 20, 24, 28,
32, 40, 48, 56, 64, 80, 96, 112, 128, 160,
192, 224, 256, 320, 384, 448, 512, 640, 768, 896,
1024, 1280, 1536, 1792, 2048, 2560, 3072, 3584, 4096, 5120,
6144, 7168, 8192, 10240, 12288, 14336, 16384, 20480, 24576, 28672, 0
};
static const int8_t adpcm_index_table2[4] = {
-1, 2,
-1, 2,
};
static const int8_t adpcm_index_table3[8] = {
-1, -1, 1, 2,
-1, -1, 1, 2,
};
static const int8_t adpcm_index_table5[32] = {
-1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
-1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
};
static const int8_t * const adpcm_index_tables[4] = {
&adpcm_index_table2[0],
&adpcm_index_table3[0],
&ff_adpcm_index_table[0],
&adpcm_index_table5[0],
};
static const int16_t mtaf_stepsize[32][16] = {
{ 1, 5, 9, 13, 16, 20, 24, 28,
-1, -5, -9, -13, -16, -20, -24, -28, },
{ 2, 6, 11, 15, 20, 24, 29, 33,
-2, -6, -11, -15, -20, -24, -29, -33, },
{ 2, 7, 13, 18, 23, 28, 34, 39,
-2, -7, -13, -18, -23, -28, -34, -39, },
{ 3, 9, 15, 21, 28, 34, 40, 46,
-3, -9, -15, -21, -28, -34, -40, -46, },
{ 3, 11, 18, 26, 33, 41, 48, 56,
-3, -11, -18, -26, -33, -41, -48, -56, },
{ 4, 13, 22, 31, 40, 49, 58, 67,
-4, -13, -22, -31, -40, -49, -58, -67, },
{ 5, 16, 26, 37, 48, 59, 69, 80,
-5, -16, -26, -37, -48, -59, -69, -80, },
{ 6, 19, 31, 44, 57, 70, 82, 95,
-6, -19, -31, -44, -57, -70, -82, -95, },
{ 7, 22, 38, 53, 68, 83, 99, 114,
-7, -22, -38, -53, -68, -83, -99, -114, },
{ 9, 27, 45, 63, 81, 99, 117, 135,
-9, -27, -45, -63, -81, -99, -117, -135, },
{ 10, 32, 53, 75, 96, 118, 139, 161,
-10, -32, -53, -75, -96, -118, -139, -161, },
{ 12, 38, 64, 90, 115, 141, 167, 193,
-12, -38, -64, -90, -115, -141, -167, -193, },
{ 15, 45, 76, 106, 137, 167, 198, 228,
-15, -45, -76, -106, -137, -167, -198, -228, },
{ 18, 54, 91, 127, 164, 200, 237, 273,
-18, -54, -91, -127, -164, -200, -237, -273, },
{ 21, 65, 108, 152, 195, 239, 282, 326,
-21, -65, -108, -152, -195, -239, -282, -326, },
{ 25, 77, 129, 181, 232, 284, 336, 388,
-25, -77, -129, -181, -232, -284, -336, -388, },
{ 30, 92, 153, 215, 276, 338, 399, 461,
-30, -92, -153, -215, -276, -338, -399, -461, },
{ 36, 109, 183, 256, 329, 402, 476, 549,
-36, -109, -183, -256, -329, -402, -476, -549, },
{ 43, 130, 218, 305, 392, 479, 567, 654,
-43, -130, -218, -305, -392, -479, -567, -654, },
{ 52, 156, 260, 364, 468, 572, 676, 780,
-52, -156, -260, -364, -468, -572, -676, -780, },
{ 62, 186, 310, 434, 558, 682, 806, 930,
-62, -186, -310, -434, -558, -682, -806, -930, },
{ 73, 221, 368, 516, 663, 811, 958, 1106,
-73, -221, -368, -516, -663, -811, -958, -1106, },
{ 87, 263, 439, 615, 790, 966, 1142, 1318,
-87, -263, -439, -615, -790, -966, -1142, -1318, },
{ 104, 314, 523, 733, 942, 1152, 1361, 1571,
-104, -314, -523, -733, -942, -1152, -1361, -1571, },
{ 124, 374, 623, 873, 1122, 1372, 1621, 1871,
-124, -374, -623, -873, -1122, -1372, -1621, -1871, },
{ 148, 445, 743, 1040, 1337, 1634, 1932, 2229,
-148, -445, -743, -1040, -1337, -1634, -1932, -2229, },
{ 177, 531, 885, 1239, 1593, 1947, 2301, 2655,
-177, -531, -885, -1239, -1593, -1947, -2301, -2655, },
{ 210, 632, 1053, 1475, 1896, 2318, 2739, 3161,
-210, -632, -1053, -1475, -1896, -2318, -2739, -3161, },
{ 251, 753, 1255, 1757, 2260, 2762, 3264, 3766,
-251, -753, -1255, -1757, -2260, -2762, -3264, -3766, },
{ 299, 897, 1495, 2093, 2692, 3290, 3888, 4486,
-299, -897, -1495, -2093, -2692, -3290, -3888, -4486, },
{ 356, 1068, 1781, 2493, 3206, 3918, 4631, 5343,
-356, -1068, -1781, -2493, -3206, -3918, -4631, -5343, },
{ 424, 1273, 2121, 2970, 3819, 4668, 5516, 6365,
-424, -1273, -2121, -2970, -3819, -4668, -5516, -6365, },
};
static const int16_t oki_step_table[49] = {
16, 17, 19, 21, 23, 25, 28, 31, 34, 37,
41, 45, 50, 55, 60, 66, 73, 80, 88, 97,
107, 118, 130, 143, 157, 173, 190, 209, 230, 253,
279, 307, 337, 371, 408, 449, 494, 544, 598, 658,
724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552
};
// padded to zero where table size is less then 16
static const int8_t swf_index_tables[4][16] = {
/*2*/ { -1, 2 },
/*3*/ { -1, -1, 2, 4 },
/*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
/*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
};
static const int8_t zork_index_table[8] = {
-1, -1, -1, 1, 4, 7, 10, 12,
};
static const int8_t mtf_index_table[16] = {
8, 6, 4, 2, -1, -1, -1, -1,
-1, -1, -1, -1, 2, 4, 6, 8,
};
/* end of tables */
typedef struct ADPCMDecodeContext {
ADPCMChannelStatus status[14];
int vqa_version; /**< VQA version. Used for ADPCM_IMA_WS */
int has_status; /**< Status flag. Reset to 0 after a flush. */
} ADPCMDecodeContext;
static void adpcm_flush(AVCodecContext *avctx);
static av_cold int adpcm_decode_init(AVCodecContext * avctx)
{
ADPCMDecodeContext *c = avctx->priv_data;
unsigned int min_channels = 1;
unsigned int max_channels = 2;
adpcm_flush(avctx);
switch(avctx->codec->id) {
case AV_CODEC_ID_ADPCM_IMA_AMV:
max_channels = 1;
break;
case AV_CODEC_ID_ADPCM_DTK:
case AV_CODEC_ID_ADPCM_EA:
min_channels = 2;
break;
case AV_CODEC_ID_ADPCM_AFC:
case AV_CODEC_ID_ADPCM_EA_R1:
case AV_CODEC_ID_ADPCM_EA_R2:
case AV_CODEC_ID_ADPCM_EA_R3:
case AV_CODEC_ID_ADPCM_EA_XAS:
case AV_CODEC_ID_ADPCM_MS:
max_channels = 6;
break;
case AV_CODEC_ID_ADPCM_MTAF:
min_channels = 2;
max_channels = 8;
if (avctx->ch_layout.nb_channels & 1) {
avpriv_request_sample(avctx, "channel count %d", avctx->ch_layout.nb_channels);
return AVERROR_PATCHWELCOME;
}
break;
case AV_CODEC_ID_ADPCM_PSX:
max_channels = 8;
if (avctx->ch_layout.nb_channels <= 0 ||
avctx->block_align % (16 * avctx->ch_layout.nb_channels))
return AVERROR_INVALIDDATA;
break;
case AV_CODEC_ID_ADPCM_IMA_DAT4:
case AV_CODEC_ID_ADPCM_THP:
case AV_CODEC_ID_ADPCM_THP_LE:
max_channels = 14;
break;
}
if (avctx->ch_layout.nb_channels < min_channels ||
avctx->ch_layout.nb_channels > max_channels) {
av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
return AVERROR(EINVAL);
}
switch(avctx->codec->id) {
case AV_CODEC_ID_ADPCM_IMA_WAV:
if (avctx->bits_per_coded_sample < 2 || avctx->bits_per_coded_sample > 5)
return AVERROR_INVALIDDATA;
break;
case AV_CODEC_ID_ADPCM_ARGO:
if (avctx->bits_per_coded_sample != 4 ||
avctx->block_align != 17 * avctx->ch_layout.nb_channels)
return AVERROR_INVALIDDATA;
break;
case AV_CODEC_ID_ADPCM_ZORK:
if (avctx->bits_per_coded_sample != 8)
return AVERROR_INVALIDDATA;
break;
default:
break;
}
switch (avctx->codec->id) {
case AV_CODEC_ID_ADPCM_AICA:
case AV_CODEC_ID_ADPCM_IMA_CUNNING:
case AV_CODEC_ID_ADPCM_IMA_DAT4:
case AV_CODEC_ID_ADPCM_IMA_QT:
case AV_CODEC_ID_ADPCM_IMA_WAV:
case AV_CODEC_ID_ADPCM_4XM:
case AV_CODEC_ID_ADPCM_XA:
case AV_CODEC_ID_ADPCM_XMD:
case AV_CODEC_ID_ADPCM_EA_R1:
case AV_CODEC_ID_ADPCM_EA_R2:
case AV_CODEC_ID_ADPCM_EA_R3:
case AV_CODEC_ID_ADPCM_EA_XAS:
case AV_CODEC_ID_ADPCM_THP:
case AV_CODEC_ID_ADPCM_THP_LE:
case AV_CODEC_ID_ADPCM_AFC:
case AV_CODEC_ID_ADPCM_DTK:
case AV_CODEC_ID_ADPCM_PSX:
case AV_CODEC_ID_ADPCM_MTAF:
case AV_CODEC_ID_ADPCM_ARGO:
case AV_CODEC_ID_ADPCM_IMA_MOFLEX:
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
break;
case AV_CODEC_ID_ADPCM_IMA_WS:
avctx->sample_fmt = c->vqa_version == 3 ? AV_SAMPLE_FMT_S16P :
AV_SAMPLE_FMT_S16;
break;
case AV_CODEC_ID_ADPCM_MS:
avctx->sample_fmt = avctx->ch_layout.nb_channels > 2 ? AV_SAMPLE_FMT_S16P :
AV_SAMPLE_FMT_S16;
break;
default:
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
}
return 0;
}
static inline int16_t adpcm_agm_expand_nibble(ADPCMChannelStatus *c, int8_t nibble)
{
int delta, pred, step, add;
pred = c->predictor;
delta = nibble & 7;
step = c->step;
add = (delta * 2 + 1) * step;
if (add < 0)
add = add + 7;
if ((nibble & 8) == 0)
pred = av_clip(pred + (add >> 3), -32767, 32767);
else
pred = av_clip(pred - (add >> 3), -32767, 32767);
switch (delta) {
case 7:
step *= 0x99;
break;
case 6:
c->step = av_clip(c->step * 2, 127, 24576);
c->predictor = pred;
return pred;
case 5:
step *= 0x66;
break;
case 4:
step *= 0x4d;
break;
default:
step *= 0x39;
break;
}
if (step < 0)
step += 0x3f;
c->step = step >> 6;
c->step = av_clip(c->step, 127, 24576);
c->predictor = pred;
return pred;
}
static inline int16_t adpcm_ima_expand_nibble(ADPCMChannelStatus *c, int8_t nibble, int shift)
{
int step_index;
int predictor;
int sign, delta, diff, step;
step = ff_adpcm_step_table[c->step_index];
step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
step_index = av_clip(step_index, 0, 88);
sign = nibble & 8;
delta = nibble & 7;
/* perform direct multiplication instead of series of jumps proposed by
* the reference ADPCM implementation since modern CPUs can do the mults
* quickly enough */
diff = ((2 * delta + 1) * step) >> shift;
predictor = c->predictor;
if (sign) predictor -= diff;
else predictor += diff;
c->predictor = av_clip_int16(predictor);
c->step_index = step_index;
return (int16_t)c->predictor;
}
static inline int16_t adpcm_ima_alp_expand_nibble(ADPCMChannelStatus *c, int8_t nibble, int shift)
{
int step_index;
int predictor;
int sign, delta, diff, step;
step = ff_adpcm_step_table[c->step_index];
step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
step_index = av_clip(step_index, 0, 88);
sign = nibble & 8;
delta = nibble & 7;
diff = (delta * step) >> shift;
predictor = c->predictor;
if (sign) predictor -= diff;
else predictor += diff;
c->predictor = av_clip_int16(predictor);
c->step_index = step_index;
return (int16_t)c->predictor;
}
static inline int16_t adpcm_ima_mtf_expand_nibble(ADPCMChannelStatus *c, int nibble)
{
int step_index, step, delta, predictor;
step = ff_adpcm_step_table[c->step_index];
delta = step * (2 * nibble - 15);
predictor = c->predictor + delta;
step_index = c->step_index + mtf_index_table[(unsigned)nibble];
c->predictor = av_clip_int16(predictor >> 4);
c->step_index = av_clip(step_index, 0, 88);
return (int16_t)c->predictor;
}
static inline int16_t adpcm_ima_cunning_expand_nibble(ADPCMChannelStatus *c, int8_t nibble)
{
int step_index;
int predictor;
int step;
nibble = sign_extend(nibble & 0xF, 4);
step = ima_cunning_step_table[c->step_index];
step_index = c->step_index + ima_cunning_index_table[abs(nibble)];
step_index = av_clip(step_index, 0, 60);
predictor = c->predictor + step * nibble;
c->predictor = av_clip_int16(predictor);
c->step_index = step_index;
return c->predictor;
}
static inline int16_t adpcm_ima_wav_expand_nibble(ADPCMChannelStatus *c, GetBitContext *gb, int bps)
{
int nibble, step_index, predictor, sign, delta, diff, step, shift;
shift = bps - 1;
nibble = get_bits_le(gb, bps),
step = ff_adpcm_step_table[c->step_index];
step_index = c->step_index + adpcm_index_tables[bps - 2][nibble];
step_index = av_clip(step_index, 0, 88);
sign = nibble & (1 << shift);
delta = av_mod_uintp2(nibble, shift);
diff = ((2 * delta + 1) * step) >> shift;
predictor = c->predictor;
if (sign) predictor -= diff;
else predictor += diff;
c->predictor = av_clip_int16(predictor);
c->step_index = step_index;
return (int16_t)c->predictor;
}
static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble)
{
int step_index;
int predictor;
int diff, step;
step = ff_adpcm_step_table[c->step_index];
step_index = c->step_index + ff_adpcm_index_table[nibble];
step_index = av_clip(step_index, 0, 88);
diff = step >> 3;
if (nibble & 4) diff += step;
if (nibble & 2) diff += step >> 1;
if (nibble & 1) diff += step >> 2;
if (nibble & 8)
predictor = c->predictor - diff;
else
predictor = c->predictor + diff;
c->predictor = av_clip_int16(predictor);
c->step_index = step_index;
return c->predictor;
}
static inline int16_t adpcm_ms_expand_nibble(ADPCMChannelStatus *c, int nibble)
{
int predictor;
predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
predictor += ((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
c->sample2 = c->sample1;
c->sample1 = av_clip_int16(predictor);
c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
if (c->idelta < 16) c->idelta = 16;
if (c->idelta > INT_MAX/768) {
av_log(NULL, AV_LOG_WARNING, "idelta overflow\n");
c->idelta = INT_MAX/768;
}
return c->sample1;
}
static inline int16_t adpcm_ima_oki_expand_nibble(ADPCMChannelStatus *c, int nibble)
{
int step_index, predictor, sign, delta, diff, step;
step = oki_step_table[c->step_index];
step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
step_index = av_clip(step_index, 0, 48);
sign = nibble & 8;
delta = nibble & 7;
diff = ((2 * delta + 1) * step) >> 3;
predictor = c->predictor;
if (sign) predictor -= diff;
else predictor += diff;
c->predictor = av_clip_intp2(predictor, 11);
c->step_index = step_index;
return c->predictor * 16;
}
static inline int16_t adpcm_ct_expand_nibble(ADPCMChannelStatus *c, int8_t nibble)
{
int sign, delta, diff;
int new_step;
sign = nibble & 8;
delta = nibble & 7;
/* perform direct multiplication instead of series of jumps proposed by
* the reference ADPCM implementation since modern CPUs can do the mults
* quickly enough */
diff = ((2 * delta + 1) * c->step) >> 3;
/* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
c->predictor = av_clip_int16(c->predictor);
/* calculate new step and clamp it to range 511..32767 */
new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;
c->step = av_clip(new_step, 511, 32767);
return (int16_t)c->predictor;
}
static inline int16_t adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, int8_t nibble, int size, int shift)
{
int sign, delta, diff;
sign = nibble & (1<<(size-1));
delta = nibble & ((1<<(size-1))-1);
diff = delta << (7 + c->step + shift);
/* clamp result */
c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
/* calculate new step */
if (delta >= (2*size - 3) && c->step < 3)
c->step++;
else if (delta == 0 && c->step > 0)
c->step--;
return (int16_t) c->predictor;
}
static inline int16_t adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, uint8_t nibble)
{
if(!c->step) {
c->predictor = 0;
c->step = 127;
}
c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;
c->predictor = av_clip_int16(c->predictor);
c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
c->step = av_clip(c->step, 127, 24576);
return c->predictor;
}
static inline int16_t adpcm_mtaf_expand_nibble(ADPCMChannelStatus *c, uint8_t nibble)
{
c->predictor += mtaf_stepsize[c->step][nibble];
c->predictor = av_clip_int16(c->predictor);
c->step += ff_adpcm_index_table[nibble];
c->step = av_clip_uintp2(c->step, 5);
return c->predictor;
}
static inline int16_t adpcm_zork_expand_nibble(ADPCMChannelStatus *c, uint8_t nibble)
{
int16_t index = c->step_index;
uint32_t lookup_sample = ff_adpcm_step_table[index];
int32_t sample = 0;
if (nibble & 0x40)
sample += lookup_sample;
if (nibble & 0x20)
sample += lookup_sample >> 1;
if (nibble & 0x10)
sample += lookup_sample >> 2;
if (nibble & 0x08)
sample += lookup_sample >> 3;
if (nibble & 0x04)
sample += lookup_sample >> 4;
if (nibble & 0x02)
sample += lookup_sample >> 5;
if (nibble & 0x01)
sample += lookup_sample >> 6;
if (nibble & 0x80)
sample = -sample;
sample += c->predictor;
sample = av_clip_int16(sample);
index += zork_index_table[(nibble >> 4) & 7];
index = av_clip(index, 0, 88);
c->predictor = sample;
c->step_index = index;
return sample;
}
static int xa_decode(AVCodecContext *avctx, int16_t *out0, int16_t *out1,
const uint8_t *in, ADPCMChannelStatus *left,
ADPCMChannelStatus *right, int channels, int sample_offset)
{
int i, j;
int shift,filter,f0,f1;
int s_1,s_2;
int d,s,t;
out0 += sample_offset;
if (channels == 1)
out1 = out0 + 28;
else
out1 += sample_offset;
for(i=0;i<4;i++) {
shift = 12 - (in[4+i*2] & 15);
filter = in[4+i*2] >> 4;
if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {
avpriv_request_sample(avctx, "unknown XA-ADPCM filter %d", filter);
filter=0;
}
if (shift < 0) {
avpriv_request_sample(avctx, "unknown XA-ADPCM shift %d", shift);
shift = 0;
}
f0 = xa_adpcm_table[filter][0];
f1 = xa_adpcm_table[filter][1];
s_1 = left->sample1;
s_2 = left->sample2;
for(j=0;j<28;j++) {
d = in[16+i+j*4];
t = sign_extend(d, 4);
s = t*(1<<shift) + ((s_1*f0 + s_2*f1+32)>>6);
s_2 = s_1;
s_1 = av_clip_int16(s);
out0[j] = s_1;
}
if (channels == 2) {
left->sample1 = s_1;
left->sample2 = s_2;
s_1 = right->sample1;
s_2 = right->sample2;
}
shift = 12 - (in[5+i*2] & 15);
filter = in[5+i*2] >> 4;
if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table) || shift < 0) {
avpriv_request_sample(avctx, "unknown XA-ADPCM filter %d", filter);
filter=0;
}
if (shift < 0) {
avpriv_request_sample(avctx, "unknown XA-ADPCM shift %d", shift);
shift = 0;
}
f0 = xa_adpcm_table[filter][0];
f1 = xa_adpcm_table[filter][1];
for(j=0;j<28;j++) {
d = in[16+i+j*4];
t = sign_extend(d >> 4, 4);
s = t*(1<<shift) + ((s_1*f0 + s_2*f1+32)>>6);
s_2 = s_1;
s_1 = av_clip_int16(s);
out1[j] = s_1;
}
if (channels == 2) {
right->sample1 = s_1;
right->sample2 = s_2;
} else {
left->sample1 = s_1;
left->sample2 = s_2;
}
out0 += 28 * (3 - channels);
out1 += 28 * (3 - channels);
}
return 0;
}
static void adpcm_swf_decode(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int16_t *samples)
{
ADPCMDecodeContext *c = avctx->priv_data;
GetBitContext gb;
const int8_t *table;
int channels = avctx->ch_layout.nb_channels;
int k0, signmask, nb_bits, count;
int size = buf_size*8;
int i;
init_get_bits(&gb, buf, size);
//read bits & initial values
nb_bits = get_bits(&gb, 2)+2;
table = swf_index_tables[nb_bits-2];
k0 = 1 << (nb_bits-2);
signmask = 1 << (nb_bits-1);
while (get_bits_count(&gb) <= size - 22 * channels) {
for (i = 0; i < channels; i++) {
*samples++ = c->status[i].predictor = get_sbits(&gb, 16);
c->status[i].step_index = get_bits(&gb, 6);
}
for (count = 0; get_bits_count(&gb) <= size - nb_bits * channels && count < 4095; count++) {
int i;
for (i = 0; i < channels; i++) {
// similar to IMA adpcm
int delta = get_bits(&gb, nb_bits);
int step = ff_adpcm_step_table[c->status[i].step_index];
int vpdiff = 0; // vpdiff = (delta+0.5)*step/4
int k = k0;
do {
if (delta & k)
vpdiff += step;
step >>= 1;
k >>= 1;
} while(k);
vpdiff += step;
if (delta & signmask)
c->status[i].predictor -= vpdiff;
else
c->status[i].predictor += vpdiff;
c->status[i].step_index += table[delta & (~signmask)];
c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
c->status[i].predictor = av_clip_int16(c->status[i].predictor);
*samples++ = c->status[i].predictor;
}
}
}
}
int16_t ff_adpcm_argo_expand_nibble(ADPCMChannelStatus *cs, int nibble, int shift, int flag)
{
int sample = sign_extend(nibble, 4) * (1 << shift);
if (flag)
sample += (8 * cs->sample1) - (4 * cs->sample2);
else
sample += 4 * cs->sample1;
sample = av_clip_int16(sample >> 2);
cs->sample2 = cs->sample1;
cs->sample1 = sample;
return sample;
}
/**
* Get the number of samples (per channel) that will be decoded from the packet.
* In one case, this is actually the maximum number of samples possible to
* decode with the given buf_size.
*
* @param[out] coded_samples set to the number of samples as coded in the
* packet, or 0 if the codec does not encode the
* number of samples in each frame.
* @param[out] approx_nb_samples set to non-zero if the number of samples
* returned is an approximation.
*/
static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
int buf_size, int *coded_samples, int *approx_nb_samples)
{
ADPCMDecodeContext *s = avctx->priv_data;
int nb_samples = 0;
int ch = avctx->ch_layout.nb_channels;
int has_coded_samples = 0;
int header_size;
*coded_samples = 0;
*approx_nb_samples = 0;
if(ch <= 0)
return 0;
switch (avctx->codec->id) {
/* constant, only check buf_size */
case AV_CODEC_ID_ADPCM_EA_XAS:
if (buf_size < 76 * ch)
return 0;
nb_samples = 128;
break;
case AV_CODEC_ID_ADPCM_IMA_QT:
if (buf_size < 34 * ch)
return 0;
nb_samples = 64;
break;
/* simple 4-bit adpcm */
case AV_CODEC_ID_ADPCM_CT:
case AV_CODEC_ID_ADPCM_IMA_APC:
case AV_CODEC_ID_ADPCM_IMA_CUNNING:
case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
case AV_CODEC_ID_ADPCM_IMA_OKI:
case AV_CODEC_ID_ADPCM_IMA_WS:
case AV_CODEC_ID_ADPCM_YAMAHA:
case AV_CODEC_ID_ADPCM_AICA:
case AV_CODEC_ID_ADPCM_IMA_SSI:
case AV_CODEC_ID_ADPCM_IMA_APM:
case AV_CODEC_ID_ADPCM_IMA_ALP:
case AV_CODEC_ID_ADPCM_IMA_MTF:
nb_samples = buf_size * 2 / ch;
break;
}
if (nb_samples)
return nb_samples;
/* simple 4-bit adpcm, with header */
header_size = 0;
switch (avctx->codec->id) {
case AV_CODEC_ID_ADPCM_4XM:
case AV_CODEC_ID_ADPCM_AGM:
case AV_CODEC_ID_ADPCM_IMA_ACORN:
case AV_CODEC_ID_ADPCM_IMA_DAT4:
case AV_CODEC_ID_ADPCM_IMA_MOFLEX:
case AV_CODEC_ID_ADPCM_IMA_ISS: header_size = 4 * ch; break;
case AV_CODEC_ID_ADPCM_IMA_SMJPEG: header_size = 4 * ch; break;
}
if (header_size > 0)
return (buf_size - header_size) * 2 / ch;
/* more complex formats */
switch (avctx->codec->id) {
case AV_CODEC_ID_ADPCM_IMA_AMV:
bytestream2_skip(gb, 4);
has_coded_samples = 1;
*coded_samples = bytestream2_get_le32u(gb);
nb_samples = FFMIN((buf_size - 8) * 2, *coded_samples);
bytestream2_seek(gb, -8, SEEK_CUR);
break;
case AV_CODEC_ID_ADPCM_EA:
has_coded_samples = 1;
*coded_samples = bytestream2_get_le32(gb);
*coded_samples -= *coded_samples % 28;
nb_samples = (buf_size - 12) / 30 * 28;
break;
case AV_CODEC_ID_ADPCM_IMA_EA_EACS:
has_coded_samples = 1;
*coded_samples = bytestream2_get_le32(gb);
nb_samples = (buf_size - (4 + 8 * ch)) * 2 / ch;
break;
case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:
nb_samples = (buf_size - ch) / ch * 2;
break;
case AV_CODEC_ID_ADPCM_EA_R1:
case AV_CODEC_ID_ADPCM_EA_R2:
case AV_CODEC_ID_ADPCM_EA_R3:
/* maximum number of samples */
/* has internal offsets and a per-frame switch to signal raw 16-bit */
has_coded_samples = 1;
switch (avctx->codec->id) {
case AV_CODEC_ID_ADPCM_EA_R1:
header_size = 4 + 9 * ch;
*coded_samples = bytestream2_get_le32(gb);
break;
case AV_CODEC_ID_ADPCM_EA_R2:
header_size = 4 + 5 * ch;
*coded_samples = bytestream2_get_le32(gb);
break;
case AV_CODEC_ID_ADPCM_EA_R3:
header_size = 4 + 5 * ch;
*coded_samples = bytestream2_get_be32(gb);
break;
}
*coded_samples -= *coded_samples % 28;
nb_samples = (buf_size - header_size) * 2 / ch;
nb_samples -= nb_samples % 28;
*approx_nb_samples = 1;
break;
case AV_CODEC_ID_ADPCM_IMA_DK3:
if (avctx->block_align > 0)
buf_size = FFMIN(buf_size, avctx->block_align);
nb_samples = ((buf_size - 16) * 2 / 3 * 4) / ch;
break;
case AV_CODEC_ID_ADPCM_IMA_DK4:
if (avctx->block_align > 0)
buf_size = FFMIN(buf_size, avctx->block_align);
if (buf_size < 4 * ch)
return AVERROR_INVALIDDATA;
nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;
break;
case AV_CODEC_ID_ADPCM_IMA_RAD:
if (avctx->block_align > 0)
buf_size = FFMIN(buf_size, avctx->block_align);
nb_samples = (buf_size - 4 * ch) * 2 / ch;
break;
CASE(ADPCM_IMA_WAV,
int bsize = ff_adpcm_ima_block_sizes[avctx->bits_per_coded_sample - 2];
int bsamples = ff_adpcm_ima_block_samples[avctx->bits_per_coded_sample - 2];
if (avctx->block_align > 0)
buf_size = FFMIN(buf_size, avctx->block_align);
if (buf_size < 4 * ch)
return AVERROR_INVALIDDATA;
nb_samples = 1 + (buf_size - 4 * ch) / (bsize * ch) * bsamples;
) /* End of CASE */
case AV_CODEC_ID_ADPCM_MS:
if (avctx->block_align > 0)
buf_size = FFMIN(buf_size, avctx->block_align);
nb_samples = (buf_size - 6 * ch) * 2 / ch;
break;
case AV_CODEC_ID_ADPCM_MTAF:
if (avctx->block_align > 0)
buf_size = FFMIN(buf_size, avctx->block_align);
nb_samples = (buf_size - 16 * (ch / 2)) * 2 / ch;
break;
case AV_CODEC_ID_ADPCM_SBPRO_2:
case AV_CODEC_ID_ADPCM_SBPRO_3:
case AV_CODEC_ID_ADPCM_SBPRO_4:
{
int samples_per_byte;
switch (avctx->codec->id) {
case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;
case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;
case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;
}