falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
Browse Source

tta decoder, tested with 44khz mono and stereo (for the latter use ffplay or change MAX_AUDIO_FRAME_SIZE) 

Originally committed as revision 4996 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Alex Beregszaszi 19 years ago
parent
46ff904f3d
commit
a24c4a2ae4
4 changed files with 454 additions and 0 deletions
Unified View
Diff Options
Show Stats Download Patch File Download Diff File
  1. +3
    -0
      libavcodec/Makefile
  2. +3
    -0
      libavcodec/allcodecs.c
  3. +2
    -0
      libavcodec/avcodec.h
  4. +446
    -0
      libavcodec/tta.c

+ 3
- 0
libavcodec/Makefile View File

@@ -169,6 +169,9 @@ endif
ifeq ($(CONFIG_TRUESPEECH_DECODER),yes) ifeq ($(CONFIG_TRUESPEECH_DECODER),yes)
OBJS+= truespeech.o OBJS+= truespeech.o
endif endif
ifeq ($(CONFIG_TTA_DECODER),yes)
OBJS+= tta.o
endif
ifeq ($(CONFIG_TSCC_DECODER),yes) ifeq ($(CONFIG_TSCC_DECODER),yes)
OBJS+= tscc.o OBJS+= tscc.o
endif endif


+ 3
- 0
libavcodec/allcodecs.c View File

@@ -505,6 +505,9 @@ void avcodec_register_all(void)
#ifdef CONFIG_TRUESPEECH_DECODER #ifdef CONFIG_TRUESPEECH_DECODER
register_avcodec(&truespeech_decoder); register_avcodec(&truespeech_decoder);
#endif //CONFIG_TRUESPEECH_DECODER #endif //CONFIG_TRUESPEECH_DECODER
#ifdef CONFIG_TTA_DECODER
register_avcodec(&tta_decoder);
#endif //CONFIG_TTA_DECODER
#ifdef CONFIG_RAWVIDEO_DECODER #ifdef CONFIG_RAWVIDEO_DECODER
register_avcodec(&rawvideo_decoder); register_avcodec(&rawvideo_decoder);
#endif //CONFIG_RAWVIDEO_DECODER #endif //CONFIG_RAWVIDEO_DECODER


+ 2
- 0
libavcodec/avcodec.h View File

@@ -191,6 +191,7 @@ enum CodecID {
CODEC_ID_QDM2, CODEC_ID_QDM2,
CODEC_ID_COOK, CODEC_ID_COOK,
CODEC_ID_TRUESPEECH, CODEC_ID_TRUESPEECH,
CODEC_ID_TTA,


CODEC_ID_OGGTHEORA= 0x16000, CODEC_ID_OGGTHEORA= 0x16000,


@@ -2154,6 +2155,7 @@ extern AVCodec mp3on4_decoder;
extern AVCodec qdm2_decoder; extern AVCodec qdm2_decoder;
extern AVCodec cook_decoder; extern AVCodec cook_decoder;
extern AVCodec truespeech_decoder; extern AVCodec truespeech_decoder;
extern AVCodec tta_decoder;
extern AVCodec mace3_decoder; extern AVCodec mace3_decoder;
extern AVCodec mace6_decoder; extern AVCodec mace6_decoder;
extern AVCodec huffyuv_decoder; extern AVCodec huffyuv_decoder;


+ 446
- 0
libavcodec/tta.c View File

@@ -0,0 +1,446 @@
/*
* TTA (The Lossless True Audio) decoder
* Copyright (c) 2006 Alex Beregszaszi
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

/**
* @file tta.c
* TTA (The Lossless True Audio) decoder
* (www.true-audio.com or tta.corecodec.org)
* @author Alex Beregszaszi
*
*/

#define ALT_BITSTREAM_READER_LE
//#define DEBUG
#include <limits.h>
#include "avcodec.h"
#include "bitstream.h"

#define FORMAT_INT 1
#define FORMAT_FLOAT 3

typedef struct TTAContext {
AVCodecContext *avctx;
GetBitContext gb;

int flags, channels, bps, is_float, data_length;
int frame_length, last_frame_length, total_frames;

long *decode_buffer;
} TTAContext;

#if 0
static inline int shift_1(int i)
{
if (i < 32)
return 1 << i;
else
return 0x80000000; // 16 << 31
}

static inline int shift_16(int i)
{
if (i < 28)
return 16 << i;
else
return 0x80000000; // 16 << 27
}
#else
static const unsigned long 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 unsigned long *shift_16 = shift_1 + 4;
#endif

#define MAX_ORDER 16
typedef struct TTAFilter {
long shift, round, error, mode;
long qm[MAX_ORDER];
long dx[MAX_ORDER];
long dl[MAX_ORDER];
} TTAFilter;

static long ttafilter_configs[4][2] = {
{10, 1},
{9, 1},
{10, 1},
{12, 0}
};

static void ttafilter_init(TTAFilter *c, long shift, long 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 long *a, register long *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, long *in, long mode) {
register long *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);
}

typedef struct TTARice {
unsigned long k0, k1, sum0, sum1;
} TTARice;

static void rice_init(TTARice *c, unsigned long k0, unsigned long 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_bits1(gb))
ret++;
return ret;
}

// shamelessly copied from shorten.c
static int inline get_le16(GetBitContext *gb)
{
return bswap_16(get_bits_long(gb, 16));
}

static int inline get_le32(GetBitContext *gb)
{
return bswap_32(get_bits_long(gb, 32));
}

static 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);
if (show_bits_long(&s->gb, 32) == bswap_32(ff_get_fourcc("TTA1")))
{
/* signature */
skip_bits(&s->gb, 32);
// if (get_bits_long(&s->gb, 32) != bswap_32(ff_get_fourcc("TTA1"))) {
// av_log(s->avctx, AV_LOG_ERROR, "Missing magic\n");
// return -1;
// }

s->flags = get_le16(&s->gb);
if (s->flags != 1 && s->flags != 3)
{
av_log(s->avctx, AV_LOG_ERROR, "Invalid flags\n");
return -1;
}
s->is_float = (s->flags == FORMAT_FLOAT);
avctx->channels = s->channels = get_le16(&s->gb);
avctx->bits_per_sample = get_le16(&s->gb);
s->bps = (avctx->bits_per_sample + 7) / 8;
avctx->sample_rate = get_le32(&s->gb);
s->data_length = get_le32(&s->gb);
skip_bits(&s->gb, 32); // CRC32 of header

if (s->is_float)
{
avctx->sample_fmt = SAMPLE_FMT_FLT;
av_log(s->avctx, AV_LOG_ERROR, "Unsupported sample format. Please contact the developers.\n");
return -1;
}
else switch(s->bps) {
// case 1: avctx->sample_fmt = SAMPLE_FMT_U8; break;
case 2: avctx->sample_fmt = SAMPLE_FMT_S16; break;
// case 3: avctx->sample_fmt = SAMPLE_FMT_S24; break;
case 4: avctx->sample_fmt = SAMPLE_FMT_S32; break;
default:
av_log(s->avctx, AV_LOG_ERROR, "Invalid/unsupported sample format. Please contact the developers.\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, "flags: %x chans: %d bps: %d rate: %d block: %d\n",
s->flags, avctx->channels, avctx->bits_per_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

s->decode_buffer = av_mallocz(sizeof(long)*s->frame_length*s->channels);
} 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,
uint8_t *buf, int buf_size)
{
TTAContext *s = avctx->priv_data;
int i;

init_get_bits(&s->gb, buf, buf_size*8);
{
long predictors[s->channels];
TTAFilter filters[s->channels];
TTARice rices[s->channels];
int cur_chan = 0, framelen = s->frame_length;
long *p;

// FIXME: seeking
s->total_frames--;
if (!s->total_frames && s->last_frame_length)
framelen = s->last_frame_length;

// init per channel states
for (i = 0; i < s->channels; i++) {
predictors[i] = 0;
ttafilter_init(&(filters[i]), ttafilter_configs[s->bps-1][0], ttafilter_configs[s->bps-1][1]);
rice_init(&(rices[i]), 10, 10);
}

for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
long *predictor = &(predictors[cur_chan]);
TTAFilter *filter = &(filters[cur_chan]);
TTARice *rice = &(rices[cur_chan]);
unsigned long unary, depth, k;
long value;

unary = tta_get_unary(&s->gb);

if (unary == 0) {
depth = 0;
k = rice->k0;
} else {
depth = 1;
k = rice->k1;
unary--;
}

if (k)
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 sign
#define SIGN(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
*p = SIGN(value);

// run hybrid filter
ttafilter_process(filter, p, 0);

// fixed order prediction
#define PRED(x, k) (long)((((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;

#if 0
// extract 32bit float from last two int samples
if (s->is_float && ((p - data) & 1)) {
unsigned long neg = *p & 0x80000000;
unsigned long hi = *(p - 1);
unsigned long lo = abs(*p) - 1;

hi += (hi || lo) ? 0x3f80 : 0;
// SWAP16: swap all the 16 bits
*(p - 1) = (hi << 16) | SWAP16(lo) | neg;
}
#endif

/*if ((get_bits_count(&s->gb)+7)/8 > buf_size)
{
av_log(NULL, AV_LOG_INFO, "overread!!\n");
break;
}*/

// flip channels
if (cur_chan < (s->channels-1))
cur_chan++;
else {
// decorrelate in case of stereo integer
if (!s->is_float && (s->channels > 1)) {
long *r = p - 1;
for (*p += *r / 2; r > p - s->channels; r--)
*r = *(r + 1) - *r;
}
cur_chan = 0;
}
}

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++ = (unsigned char)*p;
// *samples++ = (unsigned char)(*p >> 8);
*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 get_bits_count(&s->gb)+7)/8;
return buf_size;
}

static int tta_decode_close(AVCodecContext *avctx) {
TTAContext *s = avctx->priv_data;

if (s->decode_buffer)
av_free(s->decode_buffer);

return 0;
}

AVCodec tta_decoder = {
"tta",
CODEC_TYPE_AUDIO,
CODEC_ID_TTA,
sizeof(TTAContext),
tta_decode_init,
NULL,
tta_decode_close,
tta_decode_frame,
};

Write Preview
Loading…
Cancel
Save