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Split the ADTS header decoder off of the ADTS parser.

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The AAC decoder and ADTS-to-ASC BSF both require the header decoder
but not full parsing capabilities.

Originally committed as revision 24217 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2010-07-12 18:52:03 +00:00
parent 65415bb93a
commit 3cac899af9
8 changed files with 84 additions and 59 deletions
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5
configure vendored
View File

@ -1162,7 +1162,7 @@ mdct_select="fft"
rdft_select="fft"
# decoders / encoders / hardware accelerators
aac_decoder_select="mdct rdft aac_parser"
aac_decoder_select="mdct rdft"
aac_encoder_select="mdct"
ac3_decoder_select="mdct ac3_parser"
alac_encoder_select="lpc"
@ -1294,9 +1294,6 @@ vdpau_deps="vdpau_vdpau_h vdpau_vdpau_x11_h"
# parsers
h264_parser_select="golomb h264dsp"
# bitstream_filters
aac_adtstoasc_bsf_select="aac_parser"
# external libraries
libdirac_decoder_deps="libdirac !libschroedinger"
libdirac_encoder_deps="libdirac"

8
libavcodec/Makefile
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@ -42,7 +42,8 @@ OBJS-$(CONFIG_VAAPI) += vaapi.o
OBJS-$(CONFIG_VDPAU) += vdpau.o
# decoders/encoders/hardware accelerators
OBJS-$(CONFIG_AAC_DECODER) += aacdec.o aactab.o aacsbr.o aacps.o
OBJS-$(CONFIG_AAC_DECODER) += aacdec.o aactab.o aacsbr.o aacps.o \
aacadtsdec.o mpeg4audio.o
OBJS-$(CONFIG_AAC_ENCODER) += aacenc.o aaccoder.o \
aacpsy.o aactab.o \
psymodel.o iirfilter.o \
@ -550,7 +551,7 @@ OBJS-$(CONFIG_LIBXVID) += libxvidff.o libxvid_rc.o
# parsers
OBJS-$(CONFIG_AAC_PARSER) += aac_parser.o aac_ac3_parser.o \
mpeg4audio.o
aacadtsdec.o mpeg4audio.o
OBJS-$(CONFIG_AC3_PARSER) += ac3_parser.o ac3tab.o \
aac_ac3_parser.o
OBJS-$(CONFIG_CAVSVIDEO_PARSER) += cavs_parser.o
@ -586,7 +587,8 @@ OBJS-$(CONFIG_VP3_PARSER) += vp3_parser.o
OBJS-$(CONFIG_VP8_PARSER) += vp8_parser.o
# bitstream filters
OBJS-$(CONFIG_AAC_ADTSTOASC_BSF) += aac_adtstoasc_bsf.o
OBJS-$(CONFIG_AAC_ADTSTOASC_BSF) += aac_adtstoasc_bsf.o aacadtsdec.o \
mpeg4audio.o
OBJS-$(CONFIG_CHOMP_BSF) += chomp_bsf.o
OBJS-$(CONFIG_DUMP_EXTRADATA_BSF) += dump_extradata_bsf.o
OBJS-$(CONFIG_H264_MP4TOANNEXB_BSF) += h264_mp4toannexb_bsf.o

2
libavcodec/aac_adtstoasc_bsf.c
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@ -20,7 +20,7 @@
*/
#include "avcodec.h"
#include "aac_parser.h"
#include "aacadtsdec.h"
#include "put_bits.h"
#include "get_bits.h"
#include "mpeg4audio.h"

45
libavcodec/aac_parser.c
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@ -22,53 +22,10 @@
#include "parser.h"
#include "aac_ac3_parser.h"
#include "aac_parser.h"
#include "aacadtsdec.h"
#include "get_bits.h"
#include "mpeg4audio.h"
int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr)
{
int size, rdb, ch, sr;
int aot, crc_abs;
if(get_bits(gbc, 12) != 0xfff)
return AAC_AC3_PARSE_ERROR_SYNC;
skip_bits1(gbc); /* id */
skip_bits(gbc, 2); /* layer */
crc_abs = get_bits1(gbc); /* protection_absent */
aot = get_bits(gbc, 2); /* profile_objecttype */
sr = get_bits(gbc, 4); /* sample_frequency_index */
if(!ff_mpeg4audio_sample_rates[sr])
return AAC_AC3_PARSE_ERROR_SAMPLE_RATE;
skip_bits1(gbc); /* private_bit */
ch = get_bits(gbc, 3); /* channel_configuration */
skip_bits1(gbc); /* original/copy */
skip_bits1(gbc); /* home */
/* adts_variable_header */
skip_bits1(gbc); /* copyright_identification_bit */
skip_bits1(gbc); /* copyright_identification_start */
size = get_bits(gbc, 13); /* aac_frame_length */
if(size < AAC_ADTS_HEADER_SIZE)
return AAC_AC3_PARSE_ERROR_FRAME_SIZE;
skip_bits(gbc, 11); /* adts_buffer_fullness */
rdb = get_bits(gbc, 2); /* number_of_raw_data_blocks_in_frame */
hdr->object_type = aot + 1;
hdr->chan_config = ch;
hdr->crc_absent = crc_abs;
hdr->num_aac_frames = rdb + 1;
hdr->sampling_index = sr;
hdr->sample_rate = ff_mpeg4audio_sample_rates[sr];
hdr->samples = (rdb + 1) * 1024;
hdr->bit_rate = size * 8 * hdr->sample_rate / hdr->samples;
return size;
}
static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
int *need_next_header, int *new_frame_start)
{

70
libavcodec/aacadtsdec.c Normal file
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@ -0,0 +1,70 @@
/*
* Audio and Video frame extraction
* Copyright (c) 2003 Fabrice Bellard
* Copyright (c) 2003 Michael Niedermayer
* Copyright (c) 2009 Alex Converse
*
* 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 "aac_ac3_parser.h"
#include "aacadtsdec.h"
#include "get_bits.h"
#include "mpeg4audio.h"
int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr)
{
int size, rdb, ch, sr;
int aot, crc_abs;
if(get_bits(gbc, 12) != 0xfff)
return AAC_AC3_PARSE_ERROR_SYNC;
skip_bits1(gbc); /* id */
skip_bits(gbc, 2); /* layer */
crc_abs = get_bits1(gbc); /* protection_absent */
aot = get_bits(gbc, 2); /* profile_objecttype */
sr = get_bits(gbc, 4); /* sample_frequency_index */
if(!ff_mpeg4audio_sample_rates[sr])
return AAC_AC3_PARSE_ERROR_SAMPLE_RATE;
skip_bits1(gbc); /* private_bit */
ch = get_bits(gbc, 3); /* channel_configuration */
skip_bits1(gbc); /* original/copy */
skip_bits1(gbc); /* home */
/* adts_variable_header */
skip_bits1(gbc); /* copyright_identification_bit */
skip_bits1(gbc); /* copyright_identification_start */
size = get_bits(gbc, 13); /* aac_frame_length */
if(size < AAC_ADTS_HEADER_SIZE)
return AAC_AC3_PARSE_ERROR_FRAME_SIZE;
skip_bits(gbc, 11); /* adts_buffer_fullness */
rdb = get_bits(gbc, 2); /* number_of_raw_data_blocks_in_frame */
hdr->object_type = aot + 1;
hdr->chan_config = ch;
hdr->crc_absent = crc_abs;
hdr->num_aac_frames = rdb + 1;
hdr->sampling_index = sr;
hdr->sample_rate = ff_mpeg4audio_sample_rates[sr];
hdr->samples = (rdb + 1) * 1024;
hdr->bit_rate = size * 8 * hdr->sample_rate / hdr->samples;
return size;
}

9
libavcodec/aac_parser.h → libavcodec/aacadtsdec.h
View File

@ -1,5 +1,5 @@
/*
* AAC parser prototypes
* AAC ADTS header decoding prototypes and structures
* Copyright (c) 2003 Fabrice Bellard
* Copyright (c) 2003 Michael Niedermayer
*
@ -20,11 +20,10 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_AAC_PARSER_H
#define AVCODEC_AAC_PARSER_H
#ifndef AVCODEC_AACADTSDEC_H
#define AVCODEC_AACADTSDEC_H
#include <stdint.h>
#include "aac_ac3_parser.h"
#include "get_bits.h"
#define AAC_ADTS_HEADER_SIZE 7
@ -52,4 +51,4 @@ typedef struct {
*/
int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr);
#endif /* AVCODEC_AAC_PARSER_H */
#endif /* AVCODEC_AACADTSDEC_H */

2
libavcodec/aacdec.c
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@ -90,7 +90,7 @@
#include "sbr.h"
#include "aacsbr.h"
#include "mpeg4audio.h"
#include "aac_parser.h"
#include "aacadtsdec.h"
#include <assert.h>
#include <errno.h>

2
libavformat/spdif.c
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@ -43,7 +43,7 @@
#include "avformat.h"
#include "libavcodec/ac3.h"
#include "libavcodec/dca.h"
#include "libavcodec/aac_parser.h"
#include "libavcodec/aacadtsdec.h"
#define SYNCWORD1 0xF872
#define SYNCWORD2 0x4E1F