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move aac and ac3 parsers in their own files 

Originally committed as revision 8941 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2007-05-08 23:25:31 +00:00
parent e0fe500f01
commit 99ff31dc75
9 changed files with 433 additions and 314 deletions
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4
libavcodec/Makefile
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@ -275,8 +275,8 @@ OBJS-$(CONFIG_X264) += x264.o
OBJS-$(CONFIG_XVID) += xvidff.o xvid_rc.o
OBJS-$(CONFIG_AAC_PARSER) += parser.o
OBJS-$(CONFIG_AC3_PARSER) += ac3tab.o
OBJS-$(CONFIG_AAC_PARSER) += aac_parser.o aac_ac3_parser.o
OBJS-$(CONFIG_AC3_PARSER) += ac3_parser.o ac3tab.o aac_ac3_parser.o
OBJS-$(CONFIG_CAVSVIDEO_PARSER) += cavs.o
OBJS-$(CONFIG_DCA_PARSER) += dca_parser.o
OBJS-$(CONFIG_DVBSUB_PARSER) += dvbsub_parser.o

91
libavcodec/aac_ac3_parser.c Normal file
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@ -0,0 +1,91 @@
/*
* Common AAC and AC3 parser
* Copyright (c) 2003 Fabrice Bellard.
* Copyright (c) 2003 Michael Niedermayer.
*
* 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 "parser.h"
#include "aac_ac3_parser.h"
int ac3_parse(AVCodecParserContext *s1,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
AC3ParseContext *s = s1->priv_data;
const uint8_t *buf_ptr;
int len, sample_rate, bit_rate, channels, samples;
*poutbuf = NULL;
*poutbuf_size = 0;
buf_ptr = buf;
while (buf_size > 0) {
len = s->inbuf_ptr - s->inbuf;
if (s->frame_size == 0) {
/* no header seen : find one. We need at least s->header_size
bytes to parse it */
len = FFMIN(s->header_size - len, buf_size);
memcpy(s->inbuf_ptr, buf_ptr, len);
buf_ptr += len;
s->inbuf_ptr += len;
buf_size -= len;
if ((s->inbuf_ptr - s->inbuf) == s->header_size) {
len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate,
&samples);
if (len == 0) {
/* no sync found : move by one byte (inefficient, but simple!) */
memmove(s->inbuf, s->inbuf + 1, s->header_size - 1);
s->inbuf_ptr--;
} else {
s->frame_size = len;
/* update codec info */
avctx->sample_rate = sample_rate;
/* set channels,except if the user explicitly requests 1 or 2 channels, XXX/FIXME this is a bit ugly */
if(avctx->codec_id == CODEC_ID_AC3){
if(avctx->channels!=1 && avctx->channels!=2){
avctx->channels = channels;
}
} else {
avctx->channels = channels;
}
avctx->bit_rate = bit_rate;
avctx->frame_size = samples;
}
}
} else {
len = FFMIN(s->frame_size - len, buf_size);
memcpy(s->inbuf_ptr, buf_ptr, len);
buf_ptr += len;
s->inbuf_ptr += len;
buf_size -= len;
if(s->inbuf_ptr - s->inbuf == s->frame_size){
*poutbuf = s->inbuf;
*poutbuf_size = s->frame_size;
s->inbuf_ptr = s->inbuf;
s->frame_size = 0;
break;
}
}
}
return buf_ptr - buf;
}

40
libavcodec/aac_ac3_parser.h Normal file
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@ -0,0 +1,40 @@
/*
* Common AAC and AC3 parser prototypes
* Copyright (c) 2003 Fabrice Bellard.
* Copyright (c) 2003 Michael Niedermayer.
*
* 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
*/
#ifndef AAC_AC3_PARSER_H
#define AAC_AC3_PARSER_H
typedef struct AC3ParseContext {
uint8_t *inbuf_ptr;
int frame_size;
int header_size;
int (*sync)(const uint8_t *buf, int *channels, int *sample_rate,
int *bit_rate, int *samples);
uint8_t inbuf[8192]; /* input buffer */
} AC3ParseContext;
int ac3_parse(AVCodecParserContext *s1,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size);
#endif /* AAC_AC3_PARSER_H */

97
libavcodec/aac_parser.c Normal file
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@ -0,0 +1,97 @@
/*
* Audio and Video frame extraction
* Copyright (c) 2003 Fabrice Bellard.
* Copyright (c) 2003 Michael Niedermayer.
*
* 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 "parser.h"
#include "aac_ac3_parser.h"
#include "bitstream.h"
#define AAC_HEADER_SIZE 7
static const int aac_sample_rates[16] = {
96000, 88200, 64000, 48000, 44100, 32000,
24000, 22050, 16000, 12000, 11025, 8000, 7350
};
static const int aac_channels[8] = {
0, 1, 2, 3, 4, 5, 6, 8
};
static int aac_sync(const uint8_t *buf, int *channels, int *sample_rate,
int *bit_rate, int *samples)
{
GetBitContext bits;
int size, rdb, ch, sr;
init_get_bits(&bits, buf, AAC_HEADER_SIZE * 8);
if(get_bits(&bits, 12) != 0xfff)
return 0;
skip_bits1(&bits); /* id */
skip_bits(&bits, 2); /* layer */
skip_bits1(&bits); /* protection_absent */
skip_bits(&bits, 2); /* profile_objecttype */
sr = get_bits(&bits, 4); /* sample_frequency_index */
if(!aac_sample_rates[sr])
return 0;
skip_bits1(&bits); /* private_bit */
ch = get_bits(&bits, 3); /* channel_configuration */
if(!aac_channels[ch])
return 0;
skip_bits1(&bits); /* original/copy */
skip_bits1(&bits); /* home */
/* adts_variable_header */
skip_bits1(&bits); /* copyright_identification_bit */
skip_bits1(&bits); /* copyright_identification_start */
size = get_bits(&bits, 13); /* aac_frame_length */
skip_bits(&bits, 11); /* adts_buffer_fullness */
rdb = get_bits(&bits, 2); /* number_of_raw_data_blocks_in_frame */
*channels = aac_channels[ch];
*sample_rate = aac_sample_rates[sr];
*samples = (rdb + 1) * 1024;
*bit_rate = size * 8 * *sample_rate / *samples;
return size;
}
static int aac_parse_init(AVCodecParserContext *s1)
{
AC3ParseContext *s = s1->priv_data;
s->inbuf_ptr = s->inbuf;
s->header_size = AAC_HEADER_SIZE;
s->sync = aac_sync;
return 0;
}
AVCodecParser aac_parser = {
{ CODEC_ID_AAC },
sizeof(AC3ParseContext),
aac_parse_init,
ac3_parse,
NULL,
};

162
libavcodec/ac3_parser.c Normal file
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@ -0,0 +1,162 @@
/*
* AC3 parser
* Copyright (c) 2003 Fabrice Bellard.
* Copyright (c) 2003 Michael Niedermayer.
*
* 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 "parser.h"
#include "ac3_parser.h"
#include "aac_ac3_parser.h"
#include "bitstream.h"
#define AC3_HEADER_SIZE 7
static const uint8_t eac3_blocks[4] = {
1, 2, 3, 6
};
int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr)
{
GetBitContext gbc;
memset(hdr, 0, sizeof(*hdr));
init_get_bits(&gbc, buf, 54);
hdr->sync_word = get_bits(&gbc, 16);
if(hdr->sync_word != 0x0B77)
return -1;
/* read ahead to bsid to make sure this is AC-3, not E-AC-3 */
hdr->bsid = show_bits_long(&gbc, 29) & 0x1F;
if(hdr->bsid > 10)
return -2;
hdr->crc1 = get_bits(&gbc, 16);
hdr->fscod = get_bits(&gbc, 2);
if(hdr->fscod == 3)
return -3;
hdr->frmsizecod = get_bits(&gbc, 6);
if(hdr->frmsizecod > 37)
return -4;
skip_bits(&gbc, 5); // skip bsid, already got it
hdr->bsmod = get_bits(&gbc, 3);
hdr->acmod = get_bits(&gbc, 3);
if((hdr->acmod & 1) && hdr->acmod != 1) {
hdr->cmixlev = get_bits(&gbc, 2);
}
if(hdr->acmod & 4) {
hdr->surmixlev = get_bits(&gbc, 2);
}
if(hdr->acmod == 2) {
hdr->dsurmod = get_bits(&gbc, 2);
}
hdr->lfeon = get_bits1(&gbc);
hdr->halfratecod = FFMAX(hdr->bsid, 8) - 8;
hdr->sample_rate = ff_ac3_freqs[hdr->fscod] >> hdr->halfratecod;
hdr->bit_rate = (ff_ac3_bitratetab[hdr->frmsizecod>>1] * 1000) >> hdr->halfratecod;
hdr->channels = ff_ac3_channels[hdr->acmod] + hdr->lfeon;
hdr->frame_size = ff_ac3_frame_sizes[hdr->frmsizecod][hdr->fscod] * 2;
return 0;
}
static int ac3_sync(const uint8_t *buf, int *channels, int *sample_rate,
int *bit_rate, int *samples)
{
int err;
unsigned int fscod, acmod, bsid, lfeon;
unsigned int strmtyp, substreamid, frmsiz, fscod2, numblkscod;
GetBitContext bits;
AC3HeaderInfo hdr;
err = ff_ac3_parse_header(buf, &hdr);
if(err < 0 && err != -2)
return 0;
bsid = hdr.bsid;
if(bsid <= 10) { /* Normal AC-3 */
*sample_rate = hdr.sample_rate;
*bit_rate = hdr.bit_rate;
*channels = hdr.channels;
*samples = AC3_FRAME_SIZE;
return hdr.frame_size;
} else if (bsid > 10 && bsid <= 16) { /* Enhanced AC-3 */
init_get_bits(&bits, &buf[2], (AC3_HEADER_SIZE-2) * 8);
strmtyp = get_bits(&bits, 2);
substreamid = get_bits(&bits, 3);
if (strmtyp != 0 || substreamid != 0)
return 0; /* Currently don't support additional streams */
frmsiz = get_bits(&bits, 11) + 1;
fscod = get_bits(&bits, 2);
if (fscod == 3) {
fscod2 = get_bits(&bits, 2);
numblkscod = 3;
if(fscod2 == 3)
return 0;
*sample_rate = ff_ac3_freqs[fscod2] / 2;
} else {
numblkscod = get_bits(&bits, 2);
*sample_rate = ff_ac3_freqs[fscod];
}
acmod = get_bits(&bits, 3);
lfeon = get_bits1(&bits);
*samples = eac3_blocks[numblkscod] * 256;
*bit_rate = frmsiz * (*sample_rate) * 16 / (*samples);
*channels = ff_ac3_channels[acmod] + lfeon;
return frmsiz * 2;
}
/* Unsupported bitstream version */
return 0;
}
static int ac3_parse_init(AVCodecParserContext *s1)
{
AC3ParseContext *s = s1->priv_data;
s->inbuf_ptr = s->inbuf;
s->header_size = AC3_HEADER_SIZE;
s->sync = ac3_sync;
return 0;
}
AVCodecParser ac3_parser = {
{ CODEC_ID_AC3 },
sizeof(AC3ParseContext),
ac3_parse_init,
ac3_parse,
NULL,
};

40
libavcodec/ac3_parser.h Normal file
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@ -0,0 +1,40 @@
/*
* AC3 parser prototypes
* Copyright (c) 2003 Fabrice Bellard.
* Copyright (c) 2003 Michael Niedermayer.
*
* 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
*/
#ifndef AC3_PARSER_H
#define AC3_PARSER_H
#include "ac3.h"
/**
* Parses AC-3 frame header.
* Parses the header up to the lfeon element, which is the first 52 or 54 bits
* depending on the audio coding mode.
* @param buf[in] Array containing the first 7 bytes of the frame.
* @param hdr[out] Pointer to struct where header info is written.
* @return Returns 0 on success, -1 if there is a sync word mismatch,
* -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
* element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
*/
int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr);
#endif /* AC3_PARSER_H */

298
libavcodec/parser.c
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@ -311,301 +311,3 @@ int ff_mpeg4video_split(AVCodecContext *avctx,
}
return 0;
}
/*************************/
#if defined(CONFIG_AC3_PARSER) || defined(CONFIG_AAC_PARSER)
/* also used for ADTS AAC */
typedef struct AC3ParseContext {
uint8_t *inbuf_ptr;
int frame_size;
int header_size;
int (*sync)(const uint8_t *buf, int *channels, int *sample_rate,
int *bit_rate, int *samples);
uint8_t inbuf[8192]; /* input buffer */
} AC3ParseContext;
#define AC3_HEADER_SIZE 7
#define AAC_HEADER_SIZE 7
#ifdef CONFIG_AC3_PARSER
static const uint8_t eac3_blocks[4] = {
1, 2, 3, 6
};
#endif /* CONFIG_AC3_PARSER */
#ifdef CONFIG_AAC_PARSER
static const int aac_sample_rates[16] = {
96000, 88200, 64000, 48000, 44100, 32000,
24000, 22050, 16000, 12000, 11025, 8000, 7350
};
static const int aac_channels[8] = {
0, 1, 2, 3, 4, 5, 6, 8
};
#endif
#ifdef CONFIG_AC3_PARSER
int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr)
{
GetBitContext gbc;
memset(hdr, 0, sizeof(*hdr));
init_get_bits(&gbc, buf, 54);
hdr->sync_word = get_bits(&gbc, 16);
if(hdr->sync_word != 0x0B77)
return -1;
/* read ahead to bsid to make sure this is AC-3, not E-AC-3 */
hdr->bsid = show_bits_long(&gbc, 29) & 0x1F;
if(hdr->bsid > 10)
return -2;
hdr->crc1 = get_bits(&gbc, 16);
hdr->fscod = get_bits(&gbc, 2);
if(hdr->fscod == 3)
return -3;
hdr->frmsizecod = get_bits(&gbc, 6);
if(hdr->frmsizecod > 37)
return -4;
skip_bits(&gbc, 5); // skip bsid, already got it
hdr->bsmod = get_bits(&gbc, 3);
hdr->acmod = get_bits(&gbc, 3);
if((hdr->acmod & 1) && hdr->acmod != 1) {
hdr->cmixlev = get_bits(&gbc, 2);
}
if(hdr->acmod & 4) {
hdr->surmixlev = get_bits(&gbc, 2);
}
if(hdr->acmod == 2) {
hdr->dsurmod = get_bits(&gbc, 2);
}
hdr->lfeon = get_bits1(&gbc);
hdr->halfratecod = FFMAX(hdr->bsid, 8) - 8;
hdr->sample_rate = ff_ac3_freqs[hdr->fscod] >> hdr->halfratecod;
hdr->bit_rate = (ff_ac3_bitratetab[hdr->frmsizecod>>1] * 1000) >> hdr->halfratecod;
hdr->channels = ff_ac3_channels[hdr->acmod] + hdr->lfeon;
hdr->frame_size = ff_ac3_frame_sizes[hdr->frmsizecod][hdr->fscod] * 2;
return 0;
}
static int ac3_sync(const uint8_t *buf, int *channels, int *sample_rate,
int *bit_rate, int *samples)
{
int err;
unsigned int fscod, acmod, bsid, lfeon;
unsigned int strmtyp, substreamid, frmsiz, fscod2, numblkscod;
GetBitContext bits;
AC3HeaderInfo hdr;
err = ff_ac3_parse_header(buf, &hdr);
if(err < 0 && err != -2)
return 0;
bsid = hdr.bsid;
if(bsid <= 10) { /* Normal AC-3 */
*sample_rate = hdr.sample_rate;
*bit_rate = hdr.bit_rate;
*channels = hdr.channels;
*samples = AC3_FRAME_SIZE;
return hdr.frame_size;
} else if (bsid > 10 && bsid <= 16) { /* Enhanced AC-3 */
init_get_bits(&bits, &buf[2], (AC3_HEADER_SIZE-2) * 8);
strmtyp = get_bits(&bits, 2);
substreamid = get_bits(&bits, 3);
if (strmtyp != 0 || substreamid != 0)
return 0; /* Currently don't support additional streams */
frmsiz = get_bits(&bits, 11) + 1;
fscod = get_bits(&bits, 2);
if (fscod == 3) {
fscod2 = get_bits(&bits, 2);
numblkscod = 3;
if(fscod2 == 3)
return 0;
*sample_rate = ff_ac3_freqs[fscod2] / 2;
} else {
numblkscod = get_bits(&bits, 2);
*sample_rate = ff_ac3_freqs[fscod];
}
acmod = get_bits(&bits, 3);
lfeon = get_bits1(&bits);
*samples = eac3_blocks[numblkscod] * 256;
*bit_rate = frmsiz * (*sample_rate) * 16 / (*samples);
*channels = ff_ac3_channels[acmod] + lfeon;
return frmsiz * 2;
}
/* Unsupported bitstream version */
return 0;
}
#endif /* CONFIG_AC3_PARSER */
#ifdef CONFIG_AAC_PARSER
static int aac_sync(const uint8_t *buf, int *channels, int *sample_rate,
int *bit_rate, int *samples)
{
GetBitContext bits;
int size, rdb, ch, sr;
init_get_bits(&bits, buf, AAC_HEADER_SIZE * 8);
if(get_bits(&bits, 12) != 0xfff)
return 0;
skip_bits1(&bits); /* id */
skip_bits(&bits, 2); /* layer */
skip_bits1(&bits); /* protection_absent */
skip_bits(&bits, 2); /* profile_objecttype */
sr = get_bits(&bits, 4); /* sample_frequency_index */
if(!aac_sample_rates[sr])
return 0;
skip_bits1(&bits); /* private_bit */
ch = get_bits(&bits, 3); /* channel_configuration */
if(!aac_channels[ch])
return 0;
skip_bits1(&bits); /* original/copy */
skip_bits1(&bits); /* home */
/* adts_variable_header */
skip_bits1(&bits); /* copyright_identification_bit */
skip_bits1(&bits); /* copyright_identification_start */
size = get_bits(&bits, 13); /* aac_frame_length */
skip_bits(&bits, 11); /* adts_buffer_fullness */
rdb = get_bits(&bits, 2); /* number_of_raw_data_blocks_in_frame */
*channels = aac_channels[ch];
*sample_rate = aac_sample_rates[sr];
*samples = (rdb + 1) * 1024;
*bit_rate = size * 8 * *sample_rate / *samples;
return size;
}
#endif /* CONFIG_AAC_PARSER */
#ifdef CONFIG_AC3_PARSER
static int ac3_parse_init(AVCodecParserContext *s1)
{
AC3ParseContext *s = s1->priv_data;
s->inbuf_ptr = s->inbuf;
s->header_size = AC3_HEADER_SIZE;
s->sync = ac3_sync;
return 0;
}
#endif
#ifdef CONFIG_AAC_PARSER
static int aac_parse_init(AVCodecParserContext *s1)
{
AC3ParseContext *s = s1->priv_data;
s->inbuf_ptr = s->inbuf;
s->header_size = AAC_HEADER_SIZE;
s->sync = aac_sync;
return 0;
}
#endif
/* also used for ADTS AAC */
static int ac3_parse(AVCodecParserContext *s1,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
AC3ParseContext *s = s1->priv_data;
const uint8_t *buf_ptr;
int len, sample_rate, bit_rate, channels, samples;
*poutbuf = NULL;
*poutbuf_size = 0;
buf_ptr = buf;
while (buf_size > 0) {
len = s->inbuf_ptr - s->inbuf;
if (s->frame_size == 0) {
/* no header seen : find one. We need at least s->header_size
bytes to parse it */
len = FFMIN(s->header_size - len, buf_size);
memcpy(s->inbuf_ptr, buf_ptr, len);
buf_ptr += len;
s->inbuf_ptr += len;
buf_size -= len;
if ((s->inbuf_ptr - s->inbuf) == s->header_size) {
len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate,
&samples);
if (len == 0) {
/* no sync found : move by one byte (inefficient, but simple!) */
memmove(s->inbuf, s->inbuf + 1, s->header_size - 1);
s->inbuf_ptr--;
} else {
s->frame_size = len;
/* update codec info */
avctx->sample_rate = sample_rate;
/* set channels,except if the user explicitly requests 1 or 2 channels, XXX/FIXME this is a bit ugly */
if(avctx->codec_id == CODEC_ID_AC3){
if(avctx->channels!=1 && avctx->channels!=2){
avctx->channels = channels;
}
} else {
avctx->channels = channels;
}
avctx->bit_rate = bit_rate;
avctx->frame_size = samples;
}
}
} else {
len = FFMIN(s->frame_size - len, buf_size);
memcpy(s->inbuf_ptr, buf_ptr, len);
buf_ptr += len;
s->inbuf_ptr += len;
buf_size -= len;
if(s->inbuf_ptr - s->inbuf == s->frame_size){
*poutbuf = s->inbuf;
*poutbuf_size = s->frame_size;
s->inbuf_ptr = s->inbuf;
s->frame_size = 0;
break;
}
}
}
return buf_ptr - buf;
}
#endif /* CONFIG_AC3_PARSER || CONFIG_AAC_PARSER */
#ifdef CONFIG_AC3_PARSER
AVCodecParser ac3_parser = {
{ CODEC_ID_AC3 },
sizeof(AC3ParseContext),
ac3_parse_init,
ac3_parse,
NULL,
};
#endif
#ifdef CONFIG_AAC_PARSER
AVCodecParser aac_parser = {
{ CODEC_ID_AAC },
sizeof(AC3ParseContext),
aac_parse_init,
ac3_parse,
NULL,
};
#endif

13
libavcodec/parser.h
View File

@ -24,7 +24,6 @@
#define FFMPEG_PARSER_H
#include "avcodec.h"
#include "ac3.h"
typedef struct ParseContext{
uint8_t *buffer;
@ -63,16 +62,4 @@ void ff_parse1_close(AVCodecParserContext *s);
/* h263dec.c */
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
/**
* Parses AC-3 frame header.
* Parses the header up to the lfeon element, which is the first 52 or 54 bits
* depending on the audio coding mode.
* @param buf[in] Array containing the first 7 bytes of the frame.
* @param hdr[out] Pointer to struct where header info is written.
* @return Returns 0 on success, -1 if there is a sync word mismatch,
* -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
* element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
*/
int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr);
#endif /* !FFMPEG_PARSER_H */

2
libavformat/raw.c
View File

@ -20,7 +20,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "parser.h"
#include "ac3_parser.h"
#ifdef CONFIG_MUXERS
/* simple formats */