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FFmpeg/libavcodec/adpcm.c
Paul B Mahol b82c1a377a avcodec/adpcm: clip step for ADPCM MTAF decoder 
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2016-09-15 17:24:40 +02:00

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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)
*
* 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 "avcodec.h"
#include "get_bits.h"
#include "bytestream.h"
#include "adpcm.h"
#include "adpcm_data.h"
#include "internal.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/
*/
/* These are for CD-ROM XA ADPCM */
static const int xa_adpcm_table[5][2] = {
{ 0, 0 },
{ 60, 0 },
{ 115, -52 },
{ 98, -55 },
{ 122, -60 }
};
static const int ea_adpcm_table[] = {
0, 240, 460, 392,
0, 0, -208, -220,
0, 1, 3, 4,
7, 8, 10, 11,
0, -1, -3, -4
};
// padded to zero where table size is less then 16
static const int 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 }
};
/* end of tables */
typedef struct ADPCMDecodeContext {
ADPCMChannelStatus status[14];
int vqa_version; /**< VQA version. Used for ADPCM_IMA_WS */
int has_status;
} ADPCMDecodeContext;
static av_cold int adpcm_decode_init(AVCodecContext * avctx)
{
ADPCMDecodeContext *c = avctx->priv_data;
unsigned int min_channels = 1;
unsigned int max_channels = 2;
switch(avctx->codec->id) {
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:
max_channels = 6;
break;
case AV_CODEC_ID_ADPCM_MTAF:
min_channels = 2;
max_channels = 8;
break;
case AV_CODEC_ID_ADPCM_PSX:
max_channels = 8;
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->channels < min_channels || avctx->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_CT:
c->status[0].step = c->status[1].step = 511;
break;
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_IMA_APC:
if (avctx->extradata && avctx->extradata_size >= 8) {
c->status[0].predictor = AV_RL32(avctx->extradata);
c->status[1].predictor = AV_RL32(avctx->extradata + 4);
}
break;
case AV_CODEC_ID_ADPCM_IMA_WS:
if (avctx->extradata && avctx->extradata_size >= 2)
c->vqa_version = AV_RL16(avctx->extradata);
break;
default:
break;
}
switch(avctx->codec->id) {
case AV_CODEC_ID_ADPCM_AICA:
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_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:
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;
default:
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
}
return 0;
}
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_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 + ff_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 shift)
{
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 = ff_adpcm_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 << 4;
}
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, 24567);
return c->predictor;
}
static inline int16_t adpcm_mtaf_expand_nibble(ADPCMChannelStatus *c, uint8_t nibble)
{
c->predictor += ff_adpcm_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 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;
}
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<<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)) {
avpriv_request_sample(avctx, "unknown XA-ADPCM filter %d", filter);
filter=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<<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 int *table;
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*avctx->channels) {
for (i = 0; i < avctx->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*avctx->channels && count < 4095; count++) {
int i;
for (i = 0; i < avctx->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;
}
}
}
}
/**
* Get the number of samples 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->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_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:
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_IMA_DAT4:
case AV_CODEC_ID_ADPCM_IMA_ISS: header_size = 4 * ch; break;
case AV_CODEC_ID_ADPCM_IMA_AMV: header_size = 8; 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_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 AV_CODEC_ID_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;
break;
}
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;
}
if (!s->status[0].step_index) {
if (buf_size < ch)
return AVERROR_INVALIDDATA;
nb_samples++;
buf_size -= ch;
}
nb_samples += buf_size * samples_per_byte / ch;
break;
}
case AV_CODEC_ID_ADPCM_SWF:
{
int buf_bits = buf_size * 8 - 2;
int nbits = (bytestream2_get_byte(gb) >> 6) + 2;
int block_hdr_size = 22 * ch;
int block_size = block_hdr_size + nbits * ch * 4095;
int nblocks = buf_bits / block_size;
int bits_left = buf_bits - nblocks * block_size;
nb_samples = nblocks * 4096;
if (bits_left >= block_hdr_size)
nb_samples += 1 + (bits_left - block_hdr_size) / (nbits * ch);
break;
}
case AV_CODEC_ID_ADPCM_THP:
case AV_CODEC_ID_ADPCM_THP_LE:
if (avctx->extradata) {
nb_samples = buf_size * 14 / (8 * ch);
break;
}
has_coded_samples = 1;
bytestream2_skip(gb, 4); // channel size
*coded_samples = (avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE) ?
bytestream2_get_le32(gb) :
bytestream2_get_be32(gb);
buf_size -= 8 + 36 * ch;
buf_size /= ch;
nb_samples = buf_size / 8 * 14;
if (buf_size % 8 > 1)
nb_samples += (buf_size % 8 - 1) * 2;
*approx_nb_samples = 1;
break;
case AV_CODEC_ID_ADPCM_AFC:
nb_samples = buf_size / (9 * ch) * 16;
break;
case AV_CODEC_ID_ADPCM_XA:
nb_samples = (buf_size / 128) * 224 / ch;
break;
case AV_CODEC_ID_ADPCM_DTK:
case AV_CODEC_ID_ADPCM_PSX:
nb_samples = buf_size / (16 * ch) * 28;
break;
}
/* validate coded sample count */
if (has_coded_samples && (*coded_samples <= 0 || *coded_samples > nb_samples))
return AVERROR_INVALIDDATA;
return nb_samples;
}
static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
ADPCMDecodeContext *c = avctx->priv_data;
ADPCMChannelStatus *cs;
int n, m, channel, i;
int16_t *samples;
int16_t **samples_p;
int st; /* stereo */
int count1, count2;
int nb_samples, coded_samples, approx_nb_samples, ret;
GetByteContext gb;
bytestream2_init(&gb, buf, buf_size);
nb_samples = get_nb_samples(avctx, &gb, buf_size, &coded_samples, &approx_nb_samples);
if (nb_samples <= 0) {
av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n");
return AVERROR_INVALIDDATA;
}
/* get output buffer */
frame->nb_samples = nb_samples;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
samples = (int16_t *)frame->data[0];
samples_p = (int16_t **)frame->extended_data;
/* use coded_samples when applicable */
/* it is always <= nb_samples, so the output buffer will be large enough */
if (coded_samples) {
if (!approx_nb_samples && coded_samples != nb_samples)
av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n");
frame->nb_samples = nb_samples = coded_samples;
}
st = avctx->channels == 2 ? 1 : 0;
switch(avctx->codec->id) {
case AV_CODEC_ID_ADPCM_IMA_QT:
/* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).
Channel data is interleaved per-chunk. */
for (channel = 0; channel < avctx->channels; channel++) {
int predictor;
int step_index;
cs = &(c->status[channel]);
/* (pppppp) (piiiiiii) */
/* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
predictor = sign_extend(bytestream2_get_be16u(&gb), 16);
step_index = predictor & 0x7F;
predictor &= ~0x7F;
if (cs->step_index == step_index) {
int diff = predictor - cs->predictor;
if (diff < 0)
diff = - diff;
if (diff > 0x7f)
goto update;
} else {
update:
cs->step_index = step_index;
cs->predictor = predictor;
}
if (cs->step_index > 88u){
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
channel, cs->step_index);
return AVERROR_INVALIDDATA;
}
samples = samples_p[channel];
for (m = 0; m < 64; m += 2) {
int byte = bytestream2_get_byteu(&gb);
samples[m ] = adpcm_ima_qt_expand_nibble(cs, byte & 0x0F, 3);
samples[m + 1] = adpcm_ima_qt_expand_nibble(cs, byte >> 4 , 3);
}
}
break;
case AV_CODEC_ID_ADPCM_IMA_WAV:
for(i=0; i<avctx->channels; i++){
cs = &(c->status[i]);
cs->predictor = samples_p[i][0] = sign_extend(bytestream2_get_le16u(&gb), 16);
cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
if (cs->step_index > 88u){
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
i, cs->step_index);
return AVERROR_INVALIDDATA;
}
}
if (avctx->bits_per_coded_sample != 4) {
int samples_per_block = ff_adpcm_ima_block_samples[avctx->bits_per_coded_sample - 2];
int block_size = ff_adpcm_ima_block_sizes[avctx->bits_per_coded_sample - 2];
uint8_t temp[20 + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 };
GetBitContext g;
for (n = 0; n < (nb_samples - 1) / samples_per_block; n++) {
for (i = 0; i < avctx->channels; i++) {
int j;
cs = &c->status[i];
samples = &samples_p[i][1 + n * samples_per_block];
for (j = 0; j < block_size; j++) {
temp[j] = buf[4 * avctx->channels + block_size * n * avctx->channels +
(j % 4) + (j / 4) * (avctx->channels * 4) + i * 4];
}
ret = init_get_bits8(&g, (const uint8_t *)&temp, block_size);
if (ret < 0)
return ret;
for (m = 0; m < samples_per_block; m++) {
samples[m] = adpcm_ima_wav_expand_nibble(cs, &g,
avctx->bits_per_coded_sample);
}
}
}
bytestream2_skip(&gb, avctx->block_align - avctx->channels * 4);
} else {
for (n = 0; n < (nb_samples - 1) / 8; n++) {
for (i = 0; i < avctx->channels; i++) {
cs = &c->status[i];
samples = &samples_p[i][1 + n * 8];
for (m = 0; m < 8; m += 2) {
int v = bytestream2_get_byteu(&gb);
samples[m ] = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
samples[m + 1] = adpcm_ima_expand_nibble(cs, v >> 4 , 3);
}
}
}
}
break;
case AV_CODEC_ID_ADPCM_4XM:
for (i = 0; i < avctx->channels; i++)
c->status[i].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
for (i = 0; i < avctx->channels; i++) {
c->status[i].step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
if (c->status[i].step_index > 88u) {
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
i, c->status[i].step_index);
return AVERROR_INVALIDDATA;
}
}
for (i = 0; i < avctx->channels; i++) {
samples = (int16_t *)frame->data[i];
cs = &c->status[i];
for (n = nb_samples >> 1; n > 0; n--) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);
*samples++ = adpcm_ima_expand_nibble(cs, v >> 4 , 4);
}
}
break;
case AV_CODEC_ID_ADPCM_MS:
{
int block_predictor;
block_predictor = bytestream2_get_byteu(&gb);
if (block_predictor > 6) {
av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[0] = %d\n",
block_predictor);
return AVERROR_INVALIDDATA;
}
c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
if (st) {
block_predictor = bytestream2_get_byteu(&gb);
if (block_predictor > 6) {
av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[1] = %d\n",
block_predictor);
return AVERROR_INVALIDDATA;
}
c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
}
c->status[0].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);
if (st){
c->status[1].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);
}
c->status[0].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
if (st) c->status[1].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
c->status[0].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);
if (st) c->status[1].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);
*samples++ = c->status[0].sample2;
if (st) *samples++ = c->status[1].sample2;
*samples++ = c->status[0].sample1;
if (st) *samples++ = c->status[1].sample1;
for(n = (nb_samples - 2) >> (1 - st); n > 0; n--) {
int byte = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ms_expand_nibble(&c->status[0 ], byte >> 4 );
*samples++ = adpcm_ms_expand_nibble(&c->status[st], byte & 0x0F);
}
break;
}
case AV_CODEC_ID_ADPCM_MTAF:
for (channel = 0; channel < avctx->channels; channel+=2) {
bytestream2_skipu(&gb, 4);
c->status[channel ].step = bytestream2_get_le16u(&gb) & 0x1f;
c->status[channel + 1].step = bytestream2_get_le16u(&gb) & 0x1f;
c->status[channel ].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
bytestream2_skipu(&gb, 2);
c->status[channel + 1].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
bytestream2_skipu(&gb, 2);
for (n = 0; n < nb_samples; n+=2) {
int v = bytestream2_get_byteu(&gb);
samples_p[channel][n ] = adpcm_mtaf_expand_nibble(&c->status[channel], v & 0x0F);
samples_p[channel][n + 1] = adpcm_mtaf_expand_nibble(&c->status[channel], v >> 4 );
}
for (n = 0; n < nb_samples; n+=2) {
int v = bytestream2_get_byteu(&gb);
samples_p[channel + 1][n ] = adpcm_mtaf_expand_nibble(&c->status[channel + 1], v & 0x0F);
samples_p[channel + 1][n + 1] = adpcm_mtaf_expand_nibble(&c->status[channel + 1], v >> 4 );
}
}
break;
case AV_CODEC_ID_ADPCM_IMA_DK4:
for (channel = 0; channel < avctx->channels; channel++) {
cs = &c->status[channel];
cs->predictor = *samples++ = sign_extend(bytestream2_get_le16u(&gb), 16);
cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
if (cs->step_index > 88u){
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
channel, cs->step_index);
return AVERROR_INVALIDDATA;
}
}
for (n = (nb_samples - 1) >> (1 - st); n > 0; n--) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3);
*samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
}
break;
case AV_CODEC_ID_ADPCM_IMA_DK3:
{
int last_byte = 0;
int nibble;
int decode_top_nibble_next = 0;
int diff_channel;
const int16_t *samples_end = samples + avctx->channels * nb_samples;
bytestream2_skipu(&gb, 10);
c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
c->status[1].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
c->status[0].step_index = bytestream2_get_byteu(&gb);
c->status[1].step_index = bytestream2_get_byteu(&gb);
if (c->status[0].step_index > 88u || c->status[1].step_index > 88u){
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i/%i\n",
c->status[0].step_index, c->status[1].step_index);
return AVERROR_INVALIDDATA;
}
/* sign extend the predictors */
diff_channel = c->status[1].predictor;
/* DK3 ADPCM support macro */
#define DK3_GET_NEXT_NIBBLE() \
if (decode_top_nibble_next) { \
nibble = last_byte >> 4; \
decode_top_nibble_next = 0; \
} else { \
last_byte = bytestream2_get_byteu(&gb); \
nibble = last_byte & 0x0F; \
decode_top_nibble_next = 1; \
}
while (samples < samples_end) {
/* for this algorithm, c->status[0] is the sum channel and
* c->status[1] is the diff channel */
/* process the first predictor of the sum channel */
DK3_GET_NEXT_NIBBLE();
adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
/* process the diff channel predictor */
DK3_GET_NEXT_NIBBLE();
adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
/* process the first pair of stereo PCM samples */
diff_channel = (diff_channel + c->status[1].predictor) / 2;
*samples++ = c->status[0].predictor + c->status[1].predictor;
*samples++ = c->status[0].predictor - c->status[1].predictor;
/* process the second predictor of the sum channel */
DK3_GET_NEXT_NIBBLE();
adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
/* process the second pair of stereo PCM samples */
diff_channel = (diff_channel + c->status[1].predictor) / 2;
*samples++ = c->status[0].predictor + c->status[1].predictor;
*samples++ = c->status[0].predictor - c->status[1].predictor;
}
if ((bytestream2_tell(&gb) & 1))
bytestream2_skip(&gb, 1);
break;
}
case AV_CODEC_ID_ADPCM_IMA_ISS:
for (channel = 0; channel < avctx->channels; channel++) {
cs = &c->status[channel];
cs->predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
if (cs->step_index > 88u){
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
channel, cs->step_index);
return AVERROR_INVALIDDATA;
}
}
for (n = nb_samples >> (1 - st); n > 0; n--) {
int v1, v2;
int v = bytestream2_get_byteu(&gb);
/* nibbles are swapped for mono */
if (st) {
v1 = v >> 4;
v2 = v & 0x0F;
} else {
v2 = v >> 4;
v1 = v & 0x0F;
}
*samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);
*samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);
}
break;
case AV_CODEC_ID_ADPCM_IMA_DAT4:
for (channel = 0; channel < avctx->channels; channel++) {
cs = &c->status[channel];
samples = samples_p[channel];
bytestream2_skip(&gb, 4);
for (n = 0; n < nb_samples; n += 2) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_expand_nibble(cs, v >> 4 , 3);
*samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
}
}
break;
case AV_CODEC_ID_ADPCM_IMA_APC:
while (bytestream2_get_bytes_left(&gb) > 0) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4 , 3);
*samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
}
break;
case AV_CODEC_ID_ADPCM_IMA_OKI:
while (bytestream2_get_bytes_left(&gb) > 0) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_oki_expand_nibble(&c->status[0], v >> 4 );
*samples++ = adpcm_ima_oki_expand_nibble(&c->status[st], v & 0x0F);
}
break;
case AV_CODEC_ID_ADPCM_IMA_RAD:
for (channel = 0; channel < avctx->channels; channel++) {
cs = &c->status[channel];
cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
cs->predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
if (cs->step_index > 88u){
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
channel, cs->step_index);
return AVERROR_INVALIDDATA;
}
}
for (n = 0; n < nb_samples / 2; n++) {
int byte[2];
byte[0] = bytestream2_get_byteu(&gb);
if (st)
byte[1] = bytestream2_get_byteu(&gb);
for(channel = 0; channel < avctx->channels; channel++) {
*samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] & 0x0F, 3);
}
for(channel = 0; channel < avctx->channels; channel++) {
*samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] >> 4 , 3);
}
}
break;
case AV_CODEC_ID_ADPCM_IMA_WS:
if (c->vqa_version == 3) {
for (channel = 0; channel < avctx->channels; channel++) {
int16_t *smp = samples_p[channel];
for (n = nb_samples / 2; n > 0; n--) {
int v = bytestream2_get_byteu(&gb);
*smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3);
*smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
}
}
} else {
for (n = nb_samples / 2; n > 0; n--) {
for (channel = 0; channel < avctx->channels; channel++) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3);
samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
}
samples += avctx->channels;
}
}
bytestream2_seek(&gb, 0, SEEK_END);
break;
case AV_CODEC_ID_ADPCM_XA:
{
int16_t *out0 = samples_p[0];
int16_t *out1 = samples_p[1];
int samples_per_block = 28 * (3 - avctx->channels) * 4;
int sample_offset = 0;
while (bytestream2_get_bytes_left(&gb) >= 128) {
if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),
&c->status[0], &c->status[1],
avctx->channels, sample_offset)) < 0)
return ret;
bytestream2_skipu(&gb, 128);
sample_offset += samples_per_block;
}
break;
}
case AV_CODEC_ID_ADPCM_IMA_EA_EACS:
for (i=0; i<=st; i++) {
c->status[i].step_index = bytestream2_get_le32u(&gb);
if (c->status[i].step_index > 88u) {
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
i, c->status[i].step_index);
return AVERROR_INVALIDDATA;
}
}
for (i=0; i<=st; i++)
c->status[i].predictor = bytestream2_get_le32u(&gb);
for (n = nb_samples >> (1 - st); n > 0; n--) {
int byte = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_expand_nibble(&c->status[0], byte >> 4, 3);
*samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);
}
break;
case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
for (n = nb_samples >> (1 - st); n > 0; n--) {
int byte = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_expand_nibble(&c->status[0], byte >> 4, 6);
*samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);
}
break;
case AV_CODEC_ID_ADPCM_EA:
{
int previous_left_sample, previous_right_sample;
int current_left_sample, current_right_sample;
int next_left_sample, next_right_sample;
int coeff1l, coeff2l, coeff1r, coeff2r;
int shift_left, shift_right;
/* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,
each coding 28 stereo samples. */
if(avctx->channels != 2)
return AVERROR_INVALIDDATA;
current_left_sample = sign_extend(bytestream2_get_le16u(&gb), 16);
previous_left_sample = sign_extend(bytestream2_get_le16u(&gb), 16);
current_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);
previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);
for (count1 = 0; count1 < nb_samples / 28; count1++) {
int byte = bytestream2_get_byteu(&gb);
coeff1l = ea_adpcm_table[ byte >> 4 ];
coeff2l = ea_adpcm_table[(byte >> 4 ) + 4];
coeff1r = ea_adpcm_table[ byte & 0x0F];
coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];
byte = bytestream2_get_byteu(&gb);
shift_left = 20 - (byte >> 4);
shift_right = 20 - (byte & 0x0F);
for (count2 = 0; count2 < 28; count2++) {
byte = bytestream2_get_byteu(&gb);
next_left_sample = sign_extend(byte >> 4, 4) << shift_left;
next_right_sample = sign_extend(byte, 4) << shift_right;
next_left_sample = (next_left_sample +
(current_left_sample * coeff1l) +
(previous_left_sample * coeff2l) + 0x80) >> 8;
next_right_sample = (next_right_sample +
(current_right_sample * coeff1r) +
(previous_right_sample * coeff2r) + 0x80) >> 8;
previous_left_sample = current_left_sample;
current_left_sample = av_clip_int16(next_left_sample);
previous_right_sample = current_right_sample;
current_right_sample = av_clip_int16(next_right_sample);
*samples++ = current_left_sample;
*samples++ = current_right_sample;
}
}
bytestream2_skip(&gb, 2); // Skip terminating 0x0000
break;
}
case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:
{
int coeff[2][2], shift[2];
for(channel = 0; channel < avctx->channels; channel++) {
int byte = bytestream2_get_byteu(&gb);
for (i=0; i<2; i++)
coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];
shift[channel] = 20 - (byte & 0x0F);
}
for (count1 = 0; count1 < nb_samples / 2; count1++) {
int byte[2];
byte[0] = bytestream2_get_byteu(&gb);
if (st) byte[1] = bytestream2_get_byteu(&gb);
for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */
for(channel = 0; channel < avctx->channels; channel++) {
int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];
sample = (sample +
c->status[channel].sample1 * coeff[channel][0] +
c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
c->status[channel].sample2 = c->status[channel].sample1;
c->status[channel].sample1 = av_clip_int16(sample);
*samples++ = c->status[channel].sample1;
}
}
}
bytestream2_seek(&gb, 0, SEEK_END);
break;
}
case AV_CODEC_ID_ADPCM_EA_R1:
case AV_CODEC_ID_ADPCM_EA_R2:
case AV_CODEC_ID_ADPCM_EA_R3: {
/* channel numbering
2chan: 0=fl, 1=fr
4chan: 0=fl, 1=rl, 2=fr, 3=rr
6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */
const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;
int previous_sample, current_sample, next_sample;
int coeff1, coeff2;
int shift;
unsigned int channel;
uint16_t *samplesC;
int count = 0;
int offsets[6];
for (channel=0; channel<avctx->channels; channel++)
offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :
bytestream2_get_le32(&gb)) +
(avctx->channels + 1) * 4;
for (channel=0; channel<avctx->channels; channel++) {
bytestream2_seek(&gb, offsets[channel], SEEK_SET);
samplesC = samples_p[channel];
if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {
current_sample = sign_extend(bytestream2_get_le16(&gb), 16);
previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);
} else {
current_sample = c->status[channel].predictor;
previous_sample = c->status[channel].prev_sample;
}
for (count1 = 0; count1 < nb_samples / 28; count1++) {
int byte = bytestream2_get_byte(&gb);
if (byte == 0xEE) { /* only seen in R2 and R3 */
current_sample = sign_extend(bytestream2_get_be16(&gb), 16);
previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);
for (count2=0; count2<28; count2++)
*samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);
} else {
coeff1 = ea_adpcm_table[ byte >> 4 ];
coeff2 = ea_adpcm_table[(byte >> 4) + 4];
shift = 20 - (byte & 0x0F);
for (count2=0; count2<28; count2++) {
if (count2 & 1)
next_sample = sign_extend(byte, 4) << shift;
else {
byte = bytestream2_get_byte(&gb);
next_sample = sign_extend(byte >> 4, 4) << shift;
}
next_sample += (current_sample * coeff1) +
(previous_sample * coeff2);
next_sample = av_clip_int16(next_sample >> 8);
previous_sample = current_sample;
current_sample = next_sample;
*samplesC++ = current_sample;
}
}
}
if (!count) {
count = count1;
} else if (count != count1) {
av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");
count = FFMAX(count, count1);
}
if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {
c->status[channel].predictor = current_sample;
c->status[channel].prev_sample = previous_sample;
}
}
frame->nb_samples = count * 28;
bytestream2_seek(&gb, 0, SEEK_END);
break;
}
case AV_CODEC_ID_ADPCM_EA_XAS:
for (channel=0; channel<avctx->channels; channel++) {
int coeff[2][4], shift[4];
int16_t *s = samples_p[channel];
for (n = 0; n < 4; n++, s += 32) {
int val = sign_extend(bytestream2_get_le16u(&gb), 16);
for (i=0; i<2; i++)
coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];
s[0] = val & ~0x0F;
val = sign_extend(bytestream2_get_le16u(&gb), 16);
shift[n] = 20 - (val & 0x0F);
s[1] = val & ~0x0F;
}
for (m=2; m<32; m+=2) {
s = &samples_p[channel][m];
for (n = 0; n < 4; n++, s += 32) {
int level, pred;
int byte = bytestream2_get_byteu(&gb);
level = sign_extend(byte >> 4, 4) << shift[n];
pred = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];
s[0] = av_clip_int16((level + pred + 0x80) >> 8);
level = sign_extend(byte, 4) << shift[n];
pred = s[0] * coeff[0][n] + s[-1] * coeff[1][n];
s[1] = av_clip_int16((level + pred + 0x80) >> 8);
}
}
}
break;
case AV_CODEC_ID_ADPCM_IMA_AMV:
c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
c->status[0].step_index = bytestream2_get_byteu(&gb);
bytestream2_skipu(&gb, 5);
if (c->status[0].step_index > 88u) {
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",
c->status[0].step_index);
return AVERROR_INVALIDDATA;
}
for (n = nb_samples >> (1 - st); n > 0; n--) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);
*samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);
}
break;
case AV_CODEC_ID_ADPCM_IMA_SMJPEG:
for (i = 0; i < avctx->channels; i++) {
c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);
c->status[i].step_index = bytestream2_get_byteu(&gb);
bytestream2_skipu(&gb, 1);
if (c->status[i].step_index > 88u) {
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",
c->status[i].step_index);
return AVERROR_INVALIDDATA;
}
}
for (n = nb_samples >> (1 - st); n > 0; n--) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);
*samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);
}
break;
case AV_CODEC_ID_ADPCM_CT:
for (n = nb_samples >> (1 - st); n > 0; n--) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4 );
*samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);
}
break;
case AV_CODEC_ID_ADPCM_SBPRO_4:
case AV_CODEC_ID_ADPCM_SBPRO_3:
case AV_CODEC_ID_ADPCM_SBPRO_2:
if (!c->status[0].step_index) {
/* the first byte is a raw sample */
*samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);
if (st)
*samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);
c->status[0].step_index = 1;
nb_samples--;
}
if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {
for (n = nb_samples >> (1 - st); n > 0; n--) {
int byte = bytestream2_get_byteu(&gb);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
byte >> 4, 4, 0);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
byte & 0x0F, 4, 0);
}
} else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {
for (n = (nb_samples<<st) / 3; n > 0; n--) {
int byte = bytestream2_get_byteu(&gb);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
byte >> 5 , 3, 0);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
(byte >> 2) & 0x07, 3, 0);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
byte & 0x03, 2, 0);
}
} else {
for (n = nb_samples >> (2 - st); n > 0; n--) {
int byte = bytestream2_get_byteu(&gb);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
byte >> 6 , 2, 2);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
(byte >> 4) & 0x03, 2, 2);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
(byte >> 2) & 0x03, 2, 2);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
byte & 0x03, 2, 2);
}
}
break;
case AV_CODEC_ID_ADPCM_SWF:
adpcm_swf_decode(avctx, buf, buf_size, samples);
bytestream2_seek(&gb, 0, SEEK_END);
break;
case AV_CODEC_ID_ADPCM_YAMAHA:
for (n = nb_samples >> (1 - st); n > 0; n--) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);
*samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4 );
}
break;
case AV_CODEC_ID_ADPCM_AICA:
if (!c->has_status) {
for (channel = 0; channel < avctx->channels; channel++)
c->status[channel].step = 0;
c->has_status = 1;
}
for (channel = 0; channel < avctx->channels; channel++) {
samples = samples_p[channel];
for (n = nb_samples >> 1; n > 0; n--) {
int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v & 0x0F);
*samples++ = adpcm_yamaha_expand_nibble(&c->status[channel], v >> 4 );
}
}
break;
case AV_CODEC_ID_ADPCM_AFC:
{
int samples_per_block;
int blocks;
if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {
samples_per_block = avctx->extradata[0] / 16;
blocks = nb_samples / avctx->extradata[0];
} else {
samples_per_block = nb_samples / 16;
blocks = 1;
}
for (m = 0; m < blocks; m++) {
for (channel = 0; channel < avctx->channels; channel++) {
int prev1 = c->status[channel].sample1;
int prev2 = c->status[channel].sample2;
samples = samples_p[channel] + m * 16;
/* Read in every sample for this channel. */
for (i = 0; i < samples_per_block; i++) {
int byte = bytestream2_get_byteu(&gb);
int scale = 1 << (byte >> 4);
int index = byte & 0xf;
int factor1 = ff_adpcm_afc_coeffs[0][index];
int factor2 = ff_adpcm_afc_coeffs[1][index];
/* Decode 16 samples. */
for (n = 0; n < 16; n++) {
int32_t sampledat;
if (n & 1) {
sampledat = sign_extend(byte, 4);
} else {
byte = bytestream2_get_byteu(&gb);
sampledat = sign_extend(byte >> 4, 4);
}
sampledat = ((prev1 * factor1 + prev2 * factor2) +
((sampledat * scale) << 11)) >> 11;
*samples = av_clip_int16(sampledat);
prev2 = prev1;
prev1 = *samples++;
}
}
c->status[channel].sample1 = prev1;
c->status[channel].sample2 = prev2;
}
}
bytestream2_seek(&gb, 0, SEEK_END);
break;
}
case AV_CODEC_ID_ADPCM_THP:
case AV_CODEC_ID_ADPCM_THP_LE:
{
int table[14][16];
int ch;
#define THP_GET16(g) \
sign_extend( \
avctx->codec->id == AV_CODEC_ID_ADPCM_THP_LE ? \
bytestream2_get_le16u(&(g)) : \
bytestream2_get_be16u(&(g)), 16)
if (avctx->extradata) {
GetByteContext tb;
if (avctx->extradata_size < 32 * avctx->channels) {
av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");
return AVERROR_INVALIDDATA;
}
bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);
for (i = 0; i < avctx->channels; i++)
for (n = 0; n < 16; n++)
table[i][n] = THP_GET16(tb);
} else {
for (i = 0; i < avctx->channels; i++)
for (n = 0; n < 16; n++)
table[i][n] = THP_GET16(gb);
if (!c->has_status) {
/* Initialize the previous sample. */
for (i = 0; i < avctx->channels; i++) {
c->status[i].sample1 = THP_GET16(gb);
c->status[i].sample2 = THP_GET16(gb);
}
c->has_status = 1;
} else {
bytestream2_skip(&gb, avctx->channels * 4);
}
}
for (ch = 0; ch < avctx->channels; ch++) {
samples = samples_p[ch];
/* Read in every sample for this channel. */
for (i = 0; i < (nb_samples + 13) / 14; i++) {
int byte = bytestream2_get_byteu(&gb);
int index = (byte >> 4) & 7;
unsigned int exp = byte & 0x0F;
int factor1 = table[ch][index * 2];
int factor2 = table[ch][index * 2 + 1];
/* Decode 14 samples. */
for (n = 0; n < 14 && (i * 14 + n < nb_samples); n++) {
int32_t sampledat;
if (n & 1) {
sampledat = sign_extend(byte, 4);
} else {
byte = bytestream2_get_byteu(&gb);
sampledat = sign_extend(byte >> 4, 4);
}
sampledat = ((c->status[ch].sample1 * factor1
+ c->status[ch].sample2 * factor2) >> 11) + (sampledat << exp);
*samples = av_clip_int16(sampledat);
c->status[ch].sample2 = c->status[ch].sample1;
c->status[ch].sample1 = *samples++;
}
}
}
break;
}
case AV_CODEC_ID_ADPCM_DTK:
for (channel = 0; channel < avctx->channels; channel++) {
samples = samples_p[channel];
/* Read in every sample for this channel. */
for (i = 0; i < nb_samples / 28; i++) {
int byte, header;
if (channel)
bytestream2_skipu(&gb, 1);
header = bytestream2_get_byteu(&gb);
bytestream2_skipu(&gb, 3 - channel);
/* Decode 28 samples. */
for (n = 0; n < 28; n++) {
int32_t sampledat, prev;
switch (header >> 4) {
case 1:
prev = (c->status[channel].sample1 * 0x3c);
break;
case 2:
prev = (c->status[channel].sample1 * 0x73) - (c->status[channel].sample2 * 0x34);
break;
case 3:
prev = (c->status[channel].sample1 * 0x62) - (c->status[channel].sample2 * 0x37);
break;
default:
prev = 0;
}
prev = av_clip_intp2((prev + 0x20) >> 6, 21);
byte = bytestream2_get_byteu(&gb);
if (!channel)
sampledat = sign_extend(byte, 4);
else
sampledat = sign_extend(byte >> 4, 4);
sampledat = (((sampledat << 12) >> (header & 0xf)) << 6) + prev;
*samples++ = av_clip_int16(sampledat >> 6);
c->status[channel].sample2 = c->status[channel].sample1;
c->status[channel].sample1 = sampledat;
}
}
if (!channel)
bytestream2_seek(&gb, 0, SEEK_SET);
}
break;
case AV_CODEC_ID_ADPCM_PSX:
for (channel = 0; channel < avctx->channels; channel++) {
samples = samples_p[channel];
/* Read in every sample for this channel. */
for (i = 0; i < nb_samples / 28; i++) {
int filter, shift, flag, byte;
filter = bytestream2_get_byteu(&gb);
shift = filter & 0xf;
filter = filter >> 4;
if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table))
return AVERROR_INVALIDDATA;
flag = bytestream2_get_byteu(&gb);
/* Decode 28 samples. */
for (n = 0; n < 28; n++) {
int sample = 0, scale;
if (flag < 0x07) {
if (n & 1) {
scale = sign_extend(byte >> 4, 4);
} else {
byte = bytestream2_get_byteu(&gb);
scale = sign_extend(byte, 4);
}
scale = scale << 12;
sample = (int)((scale >> shift) + (c->status[channel].sample1 * xa_adpcm_table[filter][0] + c->status[channel].sample2 * xa_adpcm_table[filter][1]) / 64);
}
*samples++ = av_clip_int16(sample);
c->status[channel].sample2 = c->status[channel].sample1;
c->status[channel].sample1 = sample;
}
}
}
break;
default:
return -1;
}
if (avpkt->size && bytestream2_tell(&gb) == 0) {
av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");
return AVERROR_INVALIDDATA;
}
*got_frame_ptr = 1;
if (avpkt->size < bytestream2_tell(&gb)) {
av_log(avctx, AV_LOG_ERROR, "Overread of %d < %d\n", avpkt->size, bytestream2_tell(&gb));
return avpkt->size;
}
return bytestream2_tell(&gb);
}
static void adpcm_flush(AVCodecContext *avctx)
{
ADPCMDecodeContext *c = avctx->priv_data;
c->has_status = 0;
}
static const enum AVSampleFormat sample_fmts_s16[] = { AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_NONE };
static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE };
static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE };
#define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \
AVCodec ff_ ## name_ ## _decoder = { \
.name = #name_, \
.long_name = NULL_IF_CONFIG_SMALL(long_name_), \
.type = AVMEDIA_TYPE_AUDIO, \
.id = id_, \
.priv_data_size = sizeof(ADPCMDecodeContext), \
.init = adpcm_decode_init, \
.decode = adpcm_decode_frame, \
.flush = adpcm_flush, \
.capabilities = AV_CODEC_CAP_DR1, \
.sample_fmts = sample_fmts_, \
}
/* Note: Do not forget to add new entries to the Makefile as well. */
ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM, sample_fmts_s16p, adpcm_4xm, "ADPCM 4X Movie");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC, sample_fmts_s16p, adpcm_afc, "ADPCM Nintendo Gamecube AFC");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_AICA, sample_fmts_s16p, adpcm_aica, "ADPCM Yamaha AICA");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT, sample_fmts_s16, adpcm_ct, "ADPCM Creative Technology");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_DTK, sample_fmts_s16p, adpcm_dtk, "ADPCM Nintendo Gamecube DTK");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA, sample_fmts_s16, adpcm_ea, "ADPCM Electronic Arts");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1, sample_fmts_s16p, adpcm_ea_r1, "ADPCM Electronic Arts R1");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2, sample_fmts_s16p, adpcm_ea_r2, "ADPCM Electronic Arts R2");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3, sample_fmts_s16p, adpcm_ea_r3, "ADPCM Electronic Arts R3");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS, sample_fmts_s16p, adpcm_ea_xas, "ADPCM Electronic Arts XAS");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV, sample_fmts_s16, adpcm_ima_amv, "ADPCM IMA AMV");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC, sample_fmts_s16, adpcm_ima_apc, "ADPCM IMA CRYO APC");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DAT4, sample_fmts_s16, adpcm_ima_dat4, "ADPCM IMA Eurocom DAT4");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3, sample_fmts_s16, adpcm_ima_dk3, "ADPCM IMA Duck DK3");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4, sample_fmts_s16, adpcm_ima_dk4, "ADPCM IMA Duck DK4");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS, sample_fmts_s16, adpcm_ima_iss, "ADPCM IMA Funcom ISS");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI, sample_fmts_s16, adpcm_ima_oki, "ADPCM IMA Dialogic OKI");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT, sample_fmts_s16p, adpcm_ima_qt, "ADPCM IMA QuickTime");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD, sample_fmts_s16, adpcm_ima_rad, "ADPCM IMA Radical");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG, sample_fmts_s16, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV, sample_fmts_s16p, adpcm_ima_wav, "ADPCM IMA WAV");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS, sample_fmts_both, adpcm_ima_ws, "ADPCM IMA Westwood");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS, sample_fmts_s16, adpcm_ms, "ADPCM Microsoft");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_MTAF, sample_fmts_s16p, adpcm_mtaf, "ADPCM MTAF");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_PSX, sample_fmts_s16p, adpcm_psx, "ADPCM Playstation");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2, sample_fmts_s16, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3, sample_fmts_s16, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4, sample_fmts_s16, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF, sample_fmts_s16, adpcm_swf, "ADPCM Shockwave Flash");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP_LE, sample_fmts_s16p, adpcm_thp_le, "ADPCM Nintendo THP (little-endian)");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP, sample_fmts_s16p, adpcm_thp, "ADPCM Nintendo THP");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA, sample_fmts_s16p, adpcm_xa, "ADPCM CDROM XA");
ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA, sample_fmts_s16, adpcm_yamaha, "ADPCM Yamaha");
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