mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
420 lines
12 KiB
C
420 lines
12 KiB
C
/*
|
|
* TTA (The Lossless True Audio) decoder
|
|
* Copyright (c) 2006 Alex Beregszaszi
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* TTA (The Lossless True Audio) decoder
|
|
* @see http://www.true-audio.com/
|
|
* @see http://tta.corecodec.org/
|
|
* @author Alex Beregszaszi
|
|
*/
|
|
|
|
#define ALT_BITSTREAM_READER_LE
|
|
//#define DEBUG
|
|
#include <limits.h>
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
|
|
#define FORMAT_SIMPLE 1
|
|
#define FORMAT_ENCRYPTED 2
|
|
|
|
#define MAX_ORDER 16
|
|
typedef struct TTAFilter {
|
|
int32_t shift, round, error, mode;
|
|
int32_t qm[MAX_ORDER];
|
|
int32_t dx[MAX_ORDER];
|
|
int32_t dl[MAX_ORDER];
|
|
} TTAFilter;
|
|
|
|
typedef struct TTARice {
|
|
uint32_t k0, k1, sum0, sum1;
|
|
} TTARice;
|
|
|
|
typedef struct TTAChannel {
|
|
int32_t predictor;
|
|
TTAFilter filter;
|
|
TTARice rice;
|
|
} TTAChannel;
|
|
|
|
typedef struct TTAContext {
|
|
AVCodecContext *avctx;
|
|
GetBitContext gb;
|
|
|
|
int format, channels, bps, data_length;
|
|
int frame_length, last_frame_length, total_frames;
|
|
|
|
int32_t *decode_buffer;
|
|
|
|
TTAChannel *ch_ctx;
|
|
} TTAContext;
|
|
|
|
static const uint32_t shift_1[] = {
|
|
0x00000001, 0x00000002, 0x00000004, 0x00000008,
|
|
0x00000010, 0x00000020, 0x00000040, 0x00000080,
|
|
0x00000100, 0x00000200, 0x00000400, 0x00000800,
|
|
0x00001000, 0x00002000, 0x00004000, 0x00008000,
|
|
0x00010000, 0x00020000, 0x00040000, 0x00080000,
|
|
0x00100000, 0x00200000, 0x00400000, 0x00800000,
|
|
0x01000000, 0x02000000, 0x04000000, 0x08000000,
|
|
0x10000000, 0x20000000, 0x40000000, 0x80000000,
|
|
0x80000000, 0x80000000, 0x80000000, 0x80000000,
|
|
0x80000000, 0x80000000, 0x80000000, 0x80000000
|
|
};
|
|
|
|
static const uint32_t * const shift_16 = shift_1 + 4;
|
|
|
|
static const int32_t ttafilter_configs[4][2] = {
|
|
{10, 1},
|
|
{9, 1},
|
|
{10, 1},
|
|
{12, 0}
|
|
};
|
|
|
|
static void ttafilter_init(TTAFilter *c, int32_t shift, int32_t mode) {
|
|
memset(c, 0, sizeof(TTAFilter));
|
|
c->shift = shift;
|
|
c->round = shift_1[shift-1];
|
|
// c->round = 1 << (shift - 1);
|
|
c->mode = mode;
|
|
}
|
|
|
|
// FIXME: copy paste from original
|
|
static inline void memshl(register int32_t *a, register int32_t *b) {
|
|
*a++ = *b++;
|
|
*a++ = *b++;
|
|
*a++ = *b++;
|
|
*a++ = *b++;
|
|
*a++ = *b++;
|
|
*a++ = *b++;
|
|
*a++ = *b++;
|
|
*a = *b;
|
|
}
|
|
|
|
// FIXME: copy paste from original
|
|
// mode=1 encoder, mode=0 decoder
|
|
static inline void ttafilter_process(TTAFilter *c, int32_t *in, int32_t mode) {
|
|
register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
|
|
|
|
if (!c->error) {
|
|
sum += *dl++ * *qm, qm++;
|
|
sum += *dl++ * *qm, qm++;
|
|
sum += *dl++ * *qm, qm++;
|
|
sum += *dl++ * *qm, qm++;
|
|
sum += *dl++ * *qm, qm++;
|
|
sum += *dl++ * *qm, qm++;
|
|
sum += *dl++ * *qm, qm++;
|
|
sum += *dl++ * *qm, qm++;
|
|
dx += 8;
|
|
} else if(c->error < 0) {
|
|
sum += *dl++ * (*qm -= *dx++), qm++;
|
|
sum += *dl++ * (*qm -= *dx++), qm++;
|
|
sum += *dl++ * (*qm -= *dx++), qm++;
|
|
sum += *dl++ * (*qm -= *dx++), qm++;
|
|
sum += *dl++ * (*qm -= *dx++), qm++;
|
|
sum += *dl++ * (*qm -= *dx++), qm++;
|
|
sum += *dl++ * (*qm -= *dx++), qm++;
|
|
sum += *dl++ * (*qm -= *dx++), qm++;
|
|
} else {
|
|
sum += *dl++ * (*qm += *dx++), qm++;
|
|
sum += *dl++ * (*qm += *dx++), qm++;
|
|
sum += *dl++ * (*qm += *dx++), qm++;
|
|
sum += *dl++ * (*qm += *dx++), qm++;
|
|
sum += *dl++ * (*qm += *dx++), qm++;
|
|
sum += *dl++ * (*qm += *dx++), qm++;
|
|
sum += *dl++ * (*qm += *dx++), qm++;
|
|
sum += *dl++ * (*qm += *dx++), qm++;
|
|
}
|
|
|
|
*(dx-0) = ((*(dl-1) >> 30) | 1) << 2;
|
|
*(dx-1) = ((*(dl-2) >> 30) | 1) << 1;
|
|
*(dx-2) = ((*(dl-3) >> 30) | 1) << 1;
|
|
*(dx-3) = ((*(dl-4) >> 30) | 1);
|
|
|
|
// compress
|
|
if (mode) {
|
|
*dl = *in;
|
|
*in -= (sum >> c->shift);
|
|
c->error = *in;
|
|
} else {
|
|
c->error = *in;
|
|
*in += (sum >> c->shift);
|
|
*dl = *in;
|
|
}
|
|
|
|
if (c->mode) {
|
|
*(dl-1) = *dl - *(dl-1);
|
|
*(dl-2) = *(dl-1) - *(dl-2);
|
|
*(dl-3) = *(dl-2) - *(dl-3);
|
|
}
|
|
|
|
memshl(c->dl, c->dl + 1);
|
|
memshl(c->dx, c->dx + 1);
|
|
}
|
|
|
|
static void rice_init(TTARice *c, uint32_t k0, uint32_t k1)
|
|
{
|
|
c->k0 = k0;
|
|
c->k1 = k1;
|
|
c->sum0 = shift_16[k0];
|
|
c->sum1 = shift_16[k1];
|
|
}
|
|
|
|
static int tta_get_unary(GetBitContext *gb)
|
|
{
|
|
int ret = 0;
|
|
|
|
// count ones
|
|
while (get_bits_left(gb) > 0 && get_bits1(gb))
|
|
ret++;
|
|
return ret;
|
|
}
|
|
|
|
static av_cold int tta_decode_init(AVCodecContext * avctx)
|
|
{
|
|
TTAContext *s = avctx->priv_data;
|
|
int i;
|
|
|
|
s->avctx = avctx;
|
|
|
|
// 30bytes includes a seektable with one frame
|
|
if (avctx->extradata_size < 30)
|
|
return -1;
|
|
|
|
init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
|
|
if (show_bits_long(&s->gb, 32) == AV_RL32("TTA1"))
|
|
{
|
|
/* signature */
|
|
skip_bits(&s->gb, 32);
|
|
|
|
s->format = get_bits(&s->gb, 16);
|
|
if (s->format > 2) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "Invalid format\n");
|
|
return -1;
|
|
}
|
|
if (s->format == FORMAT_ENCRYPTED) {
|
|
av_log_missing_feature(s->avctx, "Encrypted TTA", 0);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
avctx->channels = s->channels = get_bits(&s->gb, 16);
|
|
avctx->bits_per_coded_sample = get_bits(&s->gb, 16);
|
|
s->bps = (avctx->bits_per_coded_sample + 7) / 8;
|
|
avctx->sample_rate = get_bits_long(&s->gb, 32);
|
|
if(avctx->sample_rate > 1000000){ //prevent FRAME_TIME * avctx->sample_rate from overflowing and sanity check
|
|
av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
|
|
return -1;
|
|
}
|
|
s->data_length = get_bits_long(&s->gb, 32);
|
|
skip_bits(&s->gb, 32); // CRC32 of header
|
|
|
|
switch(s->bps) {
|
|
// case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
|
|
case 2: avctx->sample_fmt = AV_SAMPLE_FMT_S16; break;
|
|
// case 3: avctx->sample_fmt = AV_SAMPLE_FMT_S24; break;
|
|
case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
|
|
default:
|
|
av_log_ask_for_sample(s->avctx,
|
|
"Invalid/unsupported sample format.\n");
|
|
return -1;
|
|
}
|
|
|
|
// FIXME: horribly broken, but directly from reference source
|
|
#define FRAME_TIME 1.04489795918367346939
|
|
s->frame_length = (int)(FRAME_TIME * avctx->sample_rate);
|
|
|
|
s->last_frame_length = s->data_length % s->frame_length;
|
|
s->total_frames = s->data_length / s->frame_length +
|
|
(s->last_frame_length ? 1 : 0);
|
|
|
|
av_log(s->avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
|
|
s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
|
|
avctx->block_align);
|
|
av_log(s->avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
|
|
s->data_length, s->frame_length, s->last_frame_length, s->total_frames);
|
|
|
|
// FIXME: seek table
|
|
for (i = 0; i < s->total_frames; i++)
|
|
skip_bits(&s->gb, 32);
|
|
skip_bits(&s->gb, 32); // CRC32 of seektable
|
|
|
|
if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
|
|
av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
|
|
return -1;
|
|
}
|
|
|
|
s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
|
|
s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
|
|
if (!s->ch_ctx)
|
|
return AVERROR(ENOMEM);
|
|
} else {
|
|
av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tta_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
TTAContext *s = avctx->priv_data;
|
|
int i;
|
|
int cur_chan = 0, framelen = s->frame_length;
|
|
int32_t *p;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
|
|
|
// FIXME: seeking
|
|
s->total_frames--;
|
|
if (!s->total_frames && s->last_frame_length)
|
|
framelen = s->last_frame_length;
|
|
|
|
if (*data_size < (framelen * s->channels * 2)) {
|
|
av_log(avctx, AV_LOG_ERROR, "Output buffer size is too small.\n");
|
|
return -1;
|
|
}
|
|
|
|
// init per channel states
|
|
for (i = 0; i < s->channels; i++) {
|
|
s->ch_ctx[i].predictor = 0;
|
|
ttafilter_init(&s->ch_ctx[i].filter, ttafilter_configs[s->bps-1][0], ttafilter_configs[s->bps-1][1]);
|
|
rice_init(&s->ch_ctx[i].rice, 10, 10);
|
|
}
|
|
|
|
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
|
|
int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
|
|
TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
|
|
TTARice *rice = &s->ch_ctx[cur_chan].rice;
|
|
uint32_t unary, depth, k;
|
|
int32_t value;
|
|
|
|
unary = tta_get_unary(&s->gb);
|
|
|
|
if (unary == 0) {
|
|
depth = 0;
|
|
k = rice->k0;
|
|
} else {
|
|
depth = 1;
|
|
k = rice->k1;
|
|
unary--;
|
|
}
|
|
|
|
if (get_bits_left(&s->gb) < k)
|
|
return -1;
|
|
|
|
if (k) {
|
|
if (k > MIN_CACHE_BITS)
|
|
return -1;
|
|
value = (unary << k) + get_bits(&s->gb, k);
|
|
} else
|
|
value = unary;
|
|
|
|
// FIXME: copy paste from original
|
|
switch (depth) {
|
|
case 1:
|
|
rice->sum1 += value - (rice->sum1 >> 4);
|
|
if (rice->k1 > 0 && rice->sum1 < shift_16[rice->k1])
|
|
rice->k1--;
|
|
else if(rice->sum1 > shift_16[rice->k1 + 1])
|
|
rice->k1++;
|
|
value += shift_1[rice->k0];
|
|
default:
|
|
rice->sum0 += value - (rice->sum0 >> 4);
|
|
if (rice->k0 > 0 && rice->sum0 < shift_16[rice->k0])
|
|
rice->k0--;
|
|
else if(rice->sum0 > shift_16[rice->k0 + 1])
|
|
rice->k0++;
|
|
}
|
|
|
|
// extract coded value
|
|
#define UNFOLD(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
|
|
*p = UNFOLD(value);
|
|
|
|
// run hybrid filter
|
|
ttafilter_process(filter, p, 0);
|
|
|
|
// fixed order prediction
|
|
#define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k)
|
|
switch (s->bps) {
|
|
case 1: *p += PRED(*predictor, 4); break;
|
|
case 2:
|
|
case 3: *p += PRED(*predictor, 5); break;
|
|
case 4: *p += *predictor; break;
|
|
}
|
|
*predictor = *p;
|
|
|
|
// flip channels
|
|
if (cur_chan < (s->channels-1))
|
|
cur_chan++;
|
|
else {
|
|
// decorrelate in case of stereo integer
|
|
if (s->channels > 1) {
|
|
int32_t *r = p - 1;
|
|
for (*p += *r / 2; r > p - s->channels; r--)
|
|
*r = *(r + 1) - *r;
|
|
}
|
|
cur_chan = 0;
|
|
}
|
|
}
|
|
|
|
if (get_bits_left(&s->gb) < 32)
|
|
return -1;
|
|
skip_bits(&s->gb, 32); // frame crc
|
|
|
|
// convert to output buffer
|
|
switch(s->bps) {
|
|
case 2: {
|
|
uint16_t *samples = data;
|
|
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
|
|
*samples++ = *p;
|
|
}
|
|
*data_size = (uint8_t *)samples - (uint8_t *)data;
|
|
break;
|
|
}
|
|
default:
|
|
av_log(s->avctx, AV_LOG_ERROR, "Error, only 16bit samples supported!\n");
|
|
}
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int tta_decode_close(AVCodecContext *avctx) {
|
|
TTAContext *s = avctx->priv_data;
|
|
|
|
av_free(s->decode_buffer);
|
|
av_freep(&s->ch_ctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_tta_decoder = {
|
|
.name = "tta",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = CODEC_ID_TTA,
|
|
.priv_data_size = sizeof(TTAContext),
|
|
.init = tta_decode_init,
|
|
.close = tta_decode_close,
|
|
.decode = tta_decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("True Audio (TTA)"),
|
|
};
|