mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
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
parent
e0fe500f01
commit
99ff31dc75
@ -275,8 +275,8 @@ OBJS-$(CONFIG_X264) += x264.o
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OBJS-$(CONFIG_XVID) += xvidff.o xvid_rc.o
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OBJS-$(CONFIG_XVID) += xvidff.o xvid_rc.o
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OBJS-$(CONFIG_AAC_PARSER) += parser.o
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OBJS-$(CONFIG_AAC_PARSER) += aac_parser.o aac_ac3_parser.o
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OBJS-$(CONFIG_AC3_PARSER) += ac3tab.o
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OBJS-$(CONFIG_AC3_PARSER) += ac3_parser.o ac3tab.o aac_ac3_parser.o
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OBJS-$(CONFIG_CAVSVIDEO_PARSER) += cavs.o
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OBJS-$(CONFIG_CAVSVIDEO_PARSER) += cavs.o
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OBJS-$(CONFIG_DCA_PARSER) += dca_parser.o
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OBJS-$(CONFIG_DCA_PARSER) += dca_parser.o
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OBJS-$(CONFIG_DVBSUB_PARSER) += dvbsub_parser.o
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OBJS-$(CONFIG_DVBSUB_PARSER) += dvbsub_parser.o
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91
libavcodec/aac_ac3_parser.c
Normal file
91
libavcodec/aac_ac3_parser.c
Normal file
@ -0,0 +1,91 @@
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/*
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* Common AAC and AC3 parser
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* Copyright (c) 2003 Fabrice Bellard.
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* Copyright (c) 2003 Michael Niedermayer.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "parser.h"
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#include "aac_ac3_parser.h"
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int ac3_parse(AVCodecParserContext *s1,
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AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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AC3ParseContext *s = s1->priv_data;
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const uint8_t *buf_ptr;
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int len, sample_rate, bit_rate, channels, samples;
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*poutbuf = NULL;
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*poutbuf_size = 0;
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buf_ptr = buf;
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while (buf_size > 0) {
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len = s->inbuf_ptr - s->inbuf;
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if (s->frame_size == 0) {
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/* no header seen : find one. We need at least s->header_size
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bytes to parse it */
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len = FFMIN(s->header_size - len, buf_size);
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memcpy(s->inbuf_ptr, buf_ptr, len);
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buf_ptr += len;
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s->inbuf_ptr += len;
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buf_size -= len;
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if ((s->inbuf_ptr - s->inbuf) == s->header_size) {
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len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate,
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&samples);
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if (len == 0) {
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/* no sync found : move by one byte (inefficient, but simple!) */
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memmove(s->inbuf, s->inbuf + 1, s->header_size - 1);
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s->inbuf_ptr--;
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} else {
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s->frame_size = len;
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/* update codec info */
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avctx->sample_rate = sample_rate;
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/* set channels,except if the user explicitly requests 1 or 2 channels, XXX/FIXME this is a bit ugly */
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if(avctx->codec_id == CODEC_ID_AC3){
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if(avctx->channels!=1 && avctx->channels!=2){
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avctx->channels = channels;
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}
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} else {
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avctx->channels = channels;
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}
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avctx->bit_rate = bit_rate;
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avctx->frame_size = samples;
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}
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}
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} else {
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len = FFMIN(s->frame_size - len, buf_size);
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memcpy(s->inbuf_ptr, buf_ptr, len);
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buf_ptr += len;
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s->inbuf_ptr += len;
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buf_size -= len;
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if(s->inbuf_ptr - s->inbuf == s->frame_size){
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*poutbuf = s->inbuf;
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*poutbuf_size = s->frame_size;
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s->inbuf_ptr = s->inbuf;
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s->frame_size = 0;
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break;
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}
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}
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}
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return buf_ptr - buf;
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}
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40
libavcodec/aac_ac3_parser.h
Normal file
40
libavcodec/aac_ac3_parser.h
Normal file
@ -0,0 +1,40 @@
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/*
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* Common AAC and AC3 parser prototypes
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* Copyright (c) 2003 Fabrice Bellard.
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* Copyright (c) 2003 Michael Niedermayer.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AAC_AC3_PARSER_H
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#define AAC_AC3_PARSER_H
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typedef struct AC3ParseContext {
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uint8_t *inbuf_ptr;
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int frame_size;
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int header_size;
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int (*sync)(const uint8_t *buf, int *channels, int *sample_rate,
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int *bit_rate, int *samples);
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uint8_t inbuf[8192]; /* input buffer */
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} AC3ParseContext;
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int ac3_parse(AVCodecParserContext *s1,
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AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size);
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#endif /* AAC_AC3_PARSER_H */
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97
libavcodec/aac_parser.c
Normal file
97
libavcodec/aac_parser.c
Normal file
@ -0,0 +1,97 @@
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/*
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* Audio and Video frame extraction
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* Copyright (c) 2003 Fabrice Bellard.
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* Copyright (c) 2003 Michael Niedermayer.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "parser.h"
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#include "aac_ac3_parser.h"
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#include "bitstream.h"
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#define AAC_HEADER_SIZE 7
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static const int aac_sample_rates[16] = {
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96000, 88200, 64000, 48000, 44100, 32000,
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24000, 22050, 16000, 12000, 11025, 8000, 7350
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};
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static const int aac_channels[8] = {
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0, 1, 2, 3, 4, 5, 6, 8
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};
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static int aac_sync(const uint8_t *buf, int *channels, int *sample_rate,
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int *bit_rate, int *samples)
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{
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GetBitContext bits;
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int size, rdb, ch, sr;
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init_get_bits(&bits, buf, AAC_HEADER_SIZE * 8);
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if(get_bits(&bits, 12) != 0xfff)
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return 0;
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skip_bits1(&bits); /* id */
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skip_bits(&bits, 2); /* layer */
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skip_bits1(&bits); /* protection_absent */
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skip_bits(&bits, 2); /* profile_objecttype */
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sr = get_bits(&bits, 4); /* sample_frequency_index */
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if(!aac_sample_rates[sr])
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return 0;
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skip_bits1(&bits); /* private_bit */
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ch = get_bits(&bits, 3); /* channel_configuration */
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if(!aac_channels[ch])
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return 0;
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skip_bits1(&bits); /* original/copy */
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skip_bits1(&bits); /* home */
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/* adts_variable_header */
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skip_bits1(&bits); /* copyright_identification_bit */
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skip_bits1(&bits); /* copyright_identification_start */
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size = get_bits(&bits, 13); /* aac_frame_length */
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skip_bits(&bits, 11); /* adts_buffer_fullness */
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rdb = get_bits(&bits, 2); /* number_of_raw_data_blocks_in_frame */
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*channels = aac_channels[ch];
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*sample_rate = aac_sample_rates[sr];
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*samples = (rdb + 1) * 1024;
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*bit_rate = size * 8 * *sample_rate / *samples;
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return size;
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}
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static int aac_parse_init(AVCodecParserContext *s1)
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{
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AC3ParseContext *s = s1->priv_data;
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s->inbuf_ptr = s->inbuf;
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s->header_size = AAC_HEADER_SIZE;
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s->sync = aac_sync;
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return 0;
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}
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AVCodecParser aac_parser = {
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{ CODEC_ID_AAC },
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sizeof(AC3ParseContext),
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aac_parse_init,
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ac3_parse,
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NULL,
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};
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162
libavcodec/ac3_parser.c
Normal file
162
libavcodec/ac3_parser.c
Normal file
@ -0,0 +1,162 @@
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/*
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* AC3 parser
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* Copyright (c) 2003 Fabrice Bellard.
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* Copyright (c) 2003 Michael Niedermayer.
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*
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* This file is part of FFmpeg.
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|
*
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|
* 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
|
||||||
|
*/
|
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#include "parser.h"
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#include "ac3_parser.h"
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#include "aac_ac3_parser.h"
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#include "bitstream.h"
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#define AC3_HEADER_SIZE 7
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static const uint8_t eac3_blocks[4] = {
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1, 2, 3, 6
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};
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int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr)
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{
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GetBitContext gbc;
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memset(hdr, 0, sizeof(*hdr));
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init_get_bits(&gbc, buf, 54);
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hdr->sync_word = get_bits(&gbc, 16);
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|
if(hdr->sync_word != 0x0B77)
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return -1;
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|
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/* read ahead to bsid to make sure this is AC-3, not E-AC-3 */
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hdr->bsid = show_bits_long(&gbc, 29) & 0x1F;
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if(hdr->bsid > 10)
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|
return -2;
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|
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|
hdr->crc1 = get_bits(&gbc, 16);
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|
hdr->fscod = get_bits(&gbc, 2);
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|
if(hdr->fscod == 3)
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|
return -3;
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|
|
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|
hdr->frmsizecod = get_bits(&gbc, 6);
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|
if(hdr->frmsizecod > 37)
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|
return -4;
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|
|
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|
skip_bits(&gbc, 5); // skip bsid, already got it
|
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|
|
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|
hdr->bsmod = get_bits(&gbc, 3);
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|
hdr->acmod = get_bits(&gbc, 3);
|
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|
if((hdr->acmod & 1) && hdr->acmod != 1) {
|
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|
hdr->cmixlev = get_bits(&gbc, 2);
|
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|
}
|
||||||
|
if(hdr->acmod & 4) {
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|
hdr->surmixlev = get_bits(&gbc, 2);
|
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|
}
|
||||||
|
if(hdr->acmod == 2) {
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|
hdr->dsurmod = get_bits(&gbc, 2);
|
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|
}
|
||||||
|
hdr->lfeon = get_bits1(&gbc);
|
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|
|
||||||
|
hdr->halfratecod = FFMAX(hdr->bsid, 8) - 8;
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||||||
|
hdr->sample_rate = ff_ac3_freqs[hdr->fscod] >> hdr->halfratecod;
|
||||||
|
hdr->bit_rate = (ff_ac3_bitratetab[hdr->frmsizecod>>1] * 1000) >> hdr->halfratecod;
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hdr->channels = ff_ac3_channels[hdr->acmod] + hdr->lfeon;
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|
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)
|
||||||
|
{
|
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|
int err;
|
||||||
|
unsigned int fscod, acmod, bsid, lfeon;
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|
unsigned int strmtyp, substreamid, frmsiz, fscod2, numblkscod;
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|
GetBitContext bits;
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|
AC3HeaderInfo hdr;
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|
|
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|
err = ff_ac3_parse_header(buf, &hdr);
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|
|
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|
if(err < 0 && err != -2)
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|
return 0;
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|
|
||||||
|
bsid = hdr.bsid;
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||||||
|
if(bsid <= 10) { /* Normal AC-3 */
|
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|
*sample_rate = hdr.sample_rate;
|
||||||
|
*bit_rate = hdr.bit_rate;
|
||||||
|
*channels = hdr.channels;
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||||||
|
*samples = AC3_FRAME_SIZE;
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||||||
|
return hdr.frame_size;
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|
} 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
40
libavcodec/ac3_parser.h
Normal file
@ -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 */
|
||||||
@ -311,301 +311,3 @@ int ff_mpeg4video_split(AVCodecContext *avctx,
|
|||||||
}
|
}
|
||||||
return 0;
|
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
|
|
||||||
|
|||||||
@ -24,7 +24,6 @@
|
|||||||
#define FFMPEG_PARSER_H
|
#define FFMPEG_PARSER_H
|
||||||
|
|
||||||
#include "avcodec.h"
|
#include "avcodec.h"
|
||||||
#include "ac3.h"
|
|
||||||
|
|
||||||
typedef struct ParseContext{
|
typedef struct ParseContext{
|
||||||
uint8_t *buffer;
|
uint8_t *buffer;
|
||||||
@ -63,16 +62,4 @@ void ff_parse1_close(AVCodecParserContext *s);
|
|||||||
/* h263dec.c */
|
/* h263dec.c */
|
||||||
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
|
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 */
|
#endif /* !FFMPEG_PARSER_H */
|
||||||
|
|||||||
@ -20,7 +20,7 @@
|
|||||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||||||
*/
|
*/
|
||||||
#include "avformat.h"
|
#include "avformat.h"
|
||||||
#include "parser.h"
|
#include "ac3_parser.h"
|
||||||
|
|
||||||
#ifdef CONFIG_MUXERS
|
#ifdef CONFIG_MUXERS
|
||||||
/* simple formats */
|
/* simple formats */
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user