mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
522 lines
16 KiB
C
522 lines
16 KiB
C
|
/*
|
||
|
* Shorten decoder
|
||
|
* Copyright (c) 2005 Jeff Muizelaar
|
||
|
*
|
||
|
* 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 shorten.c
|
||
|
* Shorten decoder
|
||
|
* @author Jeff Muizelaar
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
#define DEBUG
|
||
|
#include <limits.h>
|
||
|
#include "avcodec.h"
|
||
|
#include "bitstream.h"
|
||
|
#include "golomb.h"
|
||
|
|
||
|
#define MAX_CHANNELS 8
|
||
|
#define MAX_BLOCKSIZE 65535
|
||
|
|
||
|
#define OUT_BUFFER_SIZE 16384
|
||
|
|
||
|
#define ULONGSIZE 2
|
||
|
|
||
|
#define WAVE_FORMAT_PCM 0x0001
|
||
|
|
||
|
#define DEFAULT_BLOCK_SIZE 256
|
||
|
|
||
|
#define TYPESIZE 4
|
||
|
#define CHANSIZE 0
|
||
|
#define LPCQSIZE 2
|
||
|
#define ENERGYSIZE 3
|
||
|
#define BITSHIFTSIZE 2
|
||
|
|
||
|
#define TYPE_S16HL 3
|
||
|
#define TYPE_S16LH 5
|
||
|
|
||
|
#define NWRAP 3
|
||
|
#define NSKIPSIZE 1
|
||
|
|
||
|
#define LPCQUANT 5
|
||
|
#define V2LPCQOFFSET (1 << LPCQUANT)
|
||
|
|
||
|
#define FNSIZE 2
|
||
|
#define FN_DIFF0 0
|
||
|
#define FN_DIFF1 1
|
||
|
#define FN_DIFF2 2
|
||
|
#define FN_DIFF3 3
|
||
|
#define FN_QUIT 4
|
||
|
#define FN_BLOCKSIZE 5
|
||
|
#define FN_BITSHIFT 6
|
||
|
#define FN_QLPC 7
|
||
|
#define FN_ZERO 8
|
||
|
#define FN_VERBATIM 9
|
||
|
|
||
|
#define VERBATIM_CKSIZE_SIZE 5
|
||
|
#define VERBATIM_BYTE_SIZE 8
|
||
|
#define CANONICAL_HEADER_SIZE 44
|
||
|
|
||
|
typedef struct ShortenContext {
|
||
|
AVCodecContext *avctx;
|
||
|
GetBitContext gb;
|
||
|
|
||
|
int min_framesize, max_framesize;
|
||
|
int channels;
|
||
|
|
||
|
int32_t *decoded[MAX_CHANNELS];
|
||
|
int32_t *offset[MAX_CHANNELS];
|
||
|
uint8_t *bitstream;
|
||
|
int bitstream_size;
|
||
|
int bitstream_index;
|
||
|
int allocated_bitstream_size;
|
||
|
int header_size;
|
||
|
uint8_t header[OUT_BUFFER_SIZE];
|
||
|
int version;
|
||
|
int cur_chan;
|
||
|
int bitshift;
|
||
|
int nmean;
|
||
|
int internal_ftype;
|
||
|
int nwrap;
|
||
|
int blocksize;
|
||
|
int bitindex;
|
||
|
int32_t lpcqoffset;
|
||
|
} ShortenContext;
|
||
|
|
||
|
static int shorten_decode_init(AVCodecContext * avctx)
|
||
|
{
|
||
|
ShortenContext *s = avctx->priv_data;
|
||
|
s->avctx = avctx;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void allocate_buffers(ShortenContext *s)
|
||
|
{
|
||
|
int i, chan;
|
||
|
for (chan=0; chan<s->channels; chan++) {
|
||
|
s->offset[chan] = av_realloc(s->offset[chan], sizeof(int32_t)*FFMAX(1, s->nmean));
|
||
|
|
||
|
s->decoded[chan] = av_realloc(s->decoded[chan], sizeof(int32_t)*(s->blocksize + s->nwrap));
|
||
|
for (i=0; i<s->nwrap; i++)
|
||
|
s->decoded[chan][i] = 0;
|
||
|
s->decoded[chan] += s->nwrap;
|
||
|
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
static inline unsigned int get_uint(ShortenContext *s, int k)
|
||
|
{
|
||
|
if (s->version != 0)
|
||
|
k = get_ur_golomb_shorten(&s->gb, ULONGSIZE);
|
||
|
return get_ur_golomb_shorten(&s->gb, k);
|
||
|
}
|
||
|
|
||
|
|
||
|
static void fix_bitshift(ShortenContext *s, int32_t *buffer)
|
||
|
{
|
||
|
int i;
|
||
|
|
||
|
if (s->bitshift != 0)
|
||
|
for (i = 0; i < s->blocksize; i++)
|
||
|
buffer[s->nwrap + i] <<= s->bitshift;
|
||
|
}
|
||
|
|
||
|
|
||
|
static void init_offset(ShortenContext *s)
|
||
|
{
|
||
|
int32_t mean = 0;
|
||
|
int chan, i;
|
||
|
int nblock = FFMAX(1, s->nmean);
|
||
|
/* initialise offset */
|
||
|
switch (s->internal_ftype)
|
||
|
{
|
||
|
case TYPE_S16HL:
|
||
|
case TYPE_S16LH:
|
||
|
mean = 0;
|
||
|
break;
|
||
|
default:
|
||
|
av_log(s->avctx, AV_LOG_ERROR, "unknown audio type");
|
||
|
abort();
|
||
|
}
|
||
|
|
||
|
for (chan = 0; chan < s->channels; chan++)
|
||
|
for (i = 0; i < nblock; i++)
|
||
|
s->offset[chan][i] = mean;
|
||
|
}
|
||
|
|
||
|
static int inline get_le32(GetBitContext *gb)
|
||
|
{
|
||
|
return bswap_32(get_bits_long(gb, 32));
|
||
|
}
|
||
|
|
||
|
static short inline get_le16(GetBitContext *gb)
|
||
|
{
|
||
|
return bswap_16(get_bits_long(gb, 16));
|
||
|
}
|
||
|
|
||
|
static int decode_wave_header(AVCodecContext *avctx, uint8_t *header, int header_size)
|
||
|
{
|
||
|
GetBitContext hb;
|
||
|
int len;
|
||
|
int chunk_size;
|
||
|
short wave_format;
|
||
|
|
||
|
init_get_bits(&hb, header, header_size*8);
|
||
|
if (get_le32(&hb) != MKTAG('R','I','F','F')) {
|
||
|
av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
chunk_size = get_le32(&hb);
|
||
|
|
||
|
if (get_le32(&hb) != MKTAG('W','A','V','E')) {
|
||
|
av_log(avctx, AV_LOG_ERROR, "missing WAVE tag\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
while (get_le32(&hb) != MKTAG('f','m','t',' ')) {
|
||
|
len = get_le32(&hb);
|
||
|
skip_bits(&hb, 8*len);
|
||
|
}
|
||
|
len = get_le32(&hb);
|
||
|
|
||
|
if (len < 16) {
|
||
|
av_log(avctx, AV_LOG_ERROR, "fmt chunk was too short\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
wave_format = get_le16(&hb);
|
||
|
|
||
|
switch (wave_format) {
|
||
|
case WAVE_FORMAT_PCM:
|
||
|
break;
|
||
|
default:
|
||
|
av_log(avctx, AV_LOG_ERROR, "unsupported wave format\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
avctx->channels = get_le16(&hb);
|
||
|
avctx->sample_rate = get_le32(&hb);
|
||
|
avctx->bit_rate = get_le32(&hb) * 8;
|
||
|
avctx->block_align = get_le16(&hb);
|
||
|
avctx->bits_per_sample = get_le16(&hb);
|
||
|
|
||
|
if (avctx->bits_per_sample != 16) {
|
||
|
av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
len -= 16;
|
||
|
if (len > 0)
|
||
|
av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int16_t * interleave_buffer(int16_t *samples, int nchan, int blocksize, int32_t **buffer) {
|
||
|
int i, chan;
|
||
|
for (i=0; i<blocksize; i++)
|
||
|
for (chan=0; chan < nchan; chan++)
|
||
|
*samples++ = FFMIN(buffer[chan][i], 32768);
|
||
|
return samples;
|
||
|
}
|
||
|
|
||
|
static void decode_subframe_lpc(ShortenContext *s, int channel, int residual_size, int pred_order)
|
||
|
{
|
||
|
int sum, i, j;
|
||
|
int coeffs[pred_order];
|
||
|
|
||
|
for (i=0; i<pred_order; i++)
|
||
|
coeffs[i] = get_sr_golomb_shorten(&s->gb, LPCQUANT);
|
||
|
|
||
|
for (i=0; i < s->blocksize; i++) {
|
||
|
sum = s->lpcqoffset;
|
||
|
for (j=0; j<pred_order; j++)
|
||
|
sum += coeffs[j] * s->decoded[channel][i-j-1];
|
||
|
s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + (sum >> LPCQUANT);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
static int shorten_decode_frame(AVCodecContext *avctx,
|
||
|
void *data, int *data_size,
|
||
|
uint8_t *buf, int buf_size)
|
||
|
{
|
||
|
ShortenContext *s = avctx->priv_data;
|
||
|
int i, input_buf_size = 0;
|
||
|
int16_t *samples = data;
|
||
|
if(s->max_framesize == 0){
|
||
|
s->max_framesize= 1024; // should hopefully be enough for the first header
|
||
|
s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
|
||
|
}
|
||
|
|
||
|
if(1 && s->max_framesize){//FIXME truncated
|
||
|
buf_size= FFMIN(buf_size, s->max_framesize - s->bitstream_size);
|
||
|
input_buf_size= buf_size;
|
||
|
|
||
|
if(s->bitstream_index + s->bitstream_size + buf_size > s->allocated_bitstream_size){
|
||
|
// printf("memmove\n");
|
||
|
memmove(s->bitstream, &s->bitstream[s->bitstream_index], s->bitstream_size);
|
||
|
s->bitstream_index=0;
|
||
|
}
|
||
|
memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf, buf_size);
|
||
|
buf= &s->bitstream[s->bitstream_index];
|
||
|
buf_size += s->bitstream_size;
|
||
|
s->bitstream_size= buf_size;
|
||
|
|
||
|
if(buf_size < s->max_framesize){
|
||
|
//dprintf("wanna more data ... %d\n", buf_size);
|
||
|
return input_buf_size;
|
||
|
}
|
||
|
}
|
||
|
init_get_bits(&s->gb, buf, buf_size*8);
|
||
|
get_bits(&s->gb, s->bitindex);
|
||
|
if (!s->blocksize)
|
||
|
{
|
||
|
int maxnlpc = 0;
|
||
|
/* shorten signature */
|
||
|
if (get_bits_long(&s->gb, 32) != bswap_32(ff_get_fourcc("ajkg"))) {
|
||
|
av_log(s->avctx, AV_LOG_ERROR, "missing shorten magic 'ajkg'\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
s->lpcqoffset = 0;
|
||
|
s->blocksize = DEFAULT_BLOCK_SIZE;
|
||
|
s->channels = 1;
|
||
|
s->nmean = -1;
|
||
|
s->version = get_bits(&s->gb, 8);
|
||
|
s->internal_ftype = get_uint(s, TYPESIZE);
|
||
|
|
||
|
s->channels = get_uint(s, CHANSIZE);
|
||
|
if (s->channels > MAX_CHANNELS) {
|
||
|
av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels);
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
/* get blocksize if version > 0 */
|
||
|
if (s->version > 0) {
|
||
|
int skip_bytes;
|
||
|
s->blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE));
|
||
|
maxnlpc = get_uint(s, LPCQSIZE);
|
||
|
s->nmean = get_uint(s, 0);
|
||
|
|
||
|
skip_bytes = get_uint(s, NSKIPSIZE);
|
||
|
for (i=0; i<skip_bytes; i++) {
|
||
|
skip_bits(&s->gb, 8);
|
||
|
}
|
||
|
}
|
||
|
s->nwrap = FFMAX(NWRAP, maxnlpc);
|
||
|
|
||
|
allocate_buffers(s);
|
||
|
|
||
|
init_offset(s);
|
||
|
|
||
|
if (s->version > 1)
|
||
|
s->lpcqoffset = V2LPCQOFFSET;
|
||
|
|
||
|
if (get_ur_golomb_shorten(&s->gb, FNSIZE) != FN_VERBATIM) {
|
||
|
av_log(s->avctx, AV_LOG_ERROR, "missing verbatim section at begining of stream\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
s->header_size = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE);
|
||
|
if (s->header_size >= OUT_BUFFER_SIZE || s->header_size < CANONICAL_HEADER_SIZE) {
|
||
|
av_log(s->avctx, AV_LOG_ERROR, "header is wrong size: %d\n", s->header_size);
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
for (i=0; i<s->header_size; i++)
|
||
|
s->header[i] = (char)get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE);
|
||
|
|
||
|
if (decode_wave_header(avctx, s->header, s->header_size) < 0)
|
||
|
return -1;
|
||
|
|
||
|
s->cur_chan = 0;
|
||
|
s->bitshift = 0;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
int cmd;
|
||
|
int len;
|
||
|
cmd = get_ur_golomb_shorten(&s->gb, FNSIZE);
|
||
|
switch (cmd) {
|
||
|
case FN_ZERO:
|
||
|
case FN_DIFF0:
|
||
|
case FN_DIFF1:
|
||
|
case FN_DIFF2:
|
||
|
case FN_DIFF3:
|
||
|
case FN_QLPC:
|
||
|
{
|
||
|
int residual_size = 0;
|
||
|
int channel = s->cur_chan;
|
||
|
int32_t coffset;
|
||
|
if (cmd != FN_ZERO) {
|
||
|
residual_size = get_ur_golomb_shorten(&s->gb, ENERGYSIZE);
|
||
|
/* this is a hack as version 0 differed in defintion of get_sr_golomb_shorten */
|
||
|
if (s->version == 0)
|
||
|
residual_size--;
|
||
|
}
|
||
|
|
||
|
if (s->nmean == 0)
|
||
|
coffset = s->offset[channel][0];
|
||
|
else {
|
||
|
int32_t sum = (s->version < 2) ? 0 : s->nmean / 2;
|
||
|
for (i=0; i<s->nmean; i++)
|
||
|
sum += s->offset[channel][i];
|
||
|
coffset = sum / s->nmean;
|
||
|
if (s->version >= 2)
|
||
|
coffset >>= FFMIN(1, s->bitshift);
|
||
|
}
|
||
|
switch (cmd) {
|
||
|
case FN_ZERO:
|
||
|
for (i=0; i<s->blocksize; i++)
|
||
|
s->decoded[channel][i] = 0;
|
||
|
break;
|
||
|
case FN_DIFF0:
|
||
|
for (i=0; i<s->blocksize; i++)
|
||
|
s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + coffset;
|
||
|
break;
|
||
|
case FN_DIFF1:
|
||
|
for (i=0; i<s->blocksize; i++)
|
||
|
s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + s->decoded[channel][i - 1];
|
||
|
break;
|
||
|
case FN_DIFF2:
|
||
|
for (i=0; i<s->blocksize; i++)
|
||
|
s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + 2*s->decoded[channel][i-1]
|
||
|
- s->decoded[channel][i-2];
|
||
|
break;
|
||
|
case FN_DIFF3:
|
||
|
for (i=0; i<s->blocksize; i++)
|
||
|
s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + 3*s->decoded[channel][i-1]
|
||
|
- 3*s->decoded[channel][i-2]
|
||
|
+ s->decoded[channel][i-3];
|
||
|
break;
|
||
|
case FN_QLPC:
|
||
|
{
|
||
|
int pred_order = get_ur_golomb_shorten(&s->gb, LPCQSIZE);
|
||
|
for (i=0; i<pred_order; i++)
|
||
|
s->decoded[channel][i - pred_order] -= coffset;
|
||
|
decode_subframe_lpc(s, channel, residual_size, pred_order);
|
||
|
if (coffset != 0)
|
||
|
for (i=0; i < s->blocksize; i++)
|
||
|
s->decoded[channel][i] += coffset;
|
||
|
}
|
||
|
}
|
||
|
if (s->nmean > 0) {
|
||
|
int32_t sum = (s->version < 2) ? 0 : s->blocksize / 2;
|
||
|
for (i=0; i<s->blocksize; i++)
|
||
|
sum += s->decoded[channel][i];
|
||
|
|
||
|
for (i=1; i<s->nmean; i++)
|
||
|
s->offset[channel][i-1] = s->offset[channel][i];
|
||
|
|
||
|
if (s->version < 2)
|
||
|
s->offset[channel][s->nmean - 1] = sum / s->blocksize;
|
||
|
else
|
||
|
s->offset[channel][s->nmean - 1] = (sum / s->blocksize) << s->bitshift;
|
||
|
}
|
||
|
for (i=-s->nwrap; i<0; i++)
|
||
|
s->decoded[channel][i] = s->decoded[channel][i + s->blocksize];
|
||
|
|
||
|
fix_bitshift(s, s->decoded[channel]);
|
||
|
|
||
|
s->cur_chan++;
|
||
|
if (s->cur_chan == s->channels) {
|
||
|
samples = interleave_buffer(samples, s->channels, s->blocksize, s->decoded);
|
||
|
s->cur_chan = 0;
|
||
|
goto frame_done;
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
break;
|
||
|
case FN_VERBATIM:
|
||
|
len = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE);
|
||
|
while (len--) {
|
||
|
get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE);
|
||
|
}
|
||
|
break;
|
||
|
case FN_BITSHIFT:
|
||
|
s->bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE);
|
||
|
break;
|
||
|
case FN_BLOCKSIZE:
|
||
|
s->blocksize = get_uint(s, av_log2(s->blocksize));
|
||
|
break;
|
||
|
case FN_QUIT:
|
||
|
return buf_size;
|
||
|
break;
|
||
|
default:
|
||
|
av_log(avctx, AV_LOG_ERROR, "unknown shorten function %d\n", cmd);
|
||
|
return -1;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
frame_done:
|
||
|
*data_size = (int8_t *)samples - (int8_t *)data;
|
||
|
|
||
|
// s->last_blocksize = s->blocksize;
|
||
|
s->bitindex = get_bits_count(&s->gb) - 8*((get_bits_count(&s->gb))/8);
|
||
|
i= (get_bits_count(&s->gb))/8;
|
||
|
if (i > buf_size) {
|
||
|
av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size);
|
||
|
s->bitstream_size=0;
|
||
|
s->bitstream_index=0;
|
||
|
return -1;
|
||
|
}
|
||
|
if (s->bitstream_size) {
|
||
|
s->bitstream_index += i;
|
||
|
s->bitstream_size -= i;
|
||
|
return input_buf_size;
|
||
|
} else
|
||
|
return i;
|
||
|
}
|
||
|
|
||
|
static int shorten_decode_close(AVCodecContext *avctx)
|
||
|
{
|
||
|
ShortenContext *s = avctx->priv_data;
|
||
|
int i;
|
||
|
|
||
|
for (i = 0; i < s->channels; i++) {
|
||
|
s->decoded[i] -= s->nwrap;
|
||
|
av_freep(&s->decoded[i]);
|
||
|
av_freep(&s->offset[i]);
|
||
|
}
|
||
|
av_freep(&s->bitstream);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void shorten_flush(AVCodecContext *avctx){
|
||
|
ShortenContext *s = avctx->priv_data;
|
||
|
|
||
|
s->bitstream_size=
|
||
|
s->bitstream_index= 0;
|
||
|
}
|
||
|
|
||
|
AVCodec shorten_decoder = {
|
||
|
"shorten",
|
||
|
CODEC_TYPE_AUDIO,
|
||
|
CODEC_ID_SHORTEN,
|
||
|
sizeof(ShortenContext),
|
||
|
shorten_decode_init,
|
||
|
NULL,
|
||
|
shorten_decode_close,
|
||
|
shorten_decode_frame,
|
||
|
.flush= shorten_flush,
|
||
|
};
|