mirror of
https://github.com/xenia-project/FFmpeg.git
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new audio/video parser API
Originally committed as revision 2492 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
962d6ae6c5
commit
8424cf505c
@ -19,7 +19,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \
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vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o \
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roqvideo.o dpcm.o interplayvideo.o xan.o rpza.o cinepak.o msrle.o \
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msvideo1.o vqavideo.o idcinvideo.o adx.o rational.o faandct.o 8bps.o \
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smc.o
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smc.o parser.o
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ifeq ($(AMR_NB),yes)
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ifeq ($(AMR_NB_FIXED),yes)
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@ -193,5 +193,16 @@ PCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);
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PCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx);
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#undef PCM_CODEC
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/* parsers */
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av_register_codec_parser(&mpegvideo_parser);
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av_register_codec_parser(&mpeg4video_parser);
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av_register_codec_parser(&h263_parser);
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av_register_codec_parser(&h264_parser);
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av_register_codec_parser(&mpegaudio_parser);
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#ifdef CONFIG_AC3
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av_register_codec_parser(&ac3_parser);
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#endif
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}
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@ -16,7 +16,7 @@ extern "C" {
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#define FFMPEG_VERSION_INT 0x000408
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#define FFMPEG_VERSION "0.4.8"
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#define LIBAVCODEC_BUILD 4691
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#define LIBAVCODEC_BUILD 4692
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#define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
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#define LIBAVCODEC_VERSION FFMPEG_VERSION
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@ -1839,6 +1839,50 @@ typedef enum {
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*/
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int avcodec(void* handle, avc_cmd_t cmd, void* pin, void* pout);
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/* frame parsing */
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typedef struct AVCodecParserContext {
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void *priv_data;
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struct AVCodecParser *parser;
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int64_t frame_offset; /* offset of the current frame */
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int64_t cur_offset; /* current offset
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(incremented by each av_parser_parse()) */
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int64_t last_frame_offset; /* offset of the last frame */
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/* video info */
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int pict_type; /* XXX: put it back in AVCodecContext */
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int repeat_pict; /* XXX: put it back in AVCodecContext */
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int64_t pts; /* in us, if given by the codec (used by raw mpeg4) */
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int64_t dts; /* in us, if given by the codec (used by raw mpeg4) */
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} AVCodecParserContext;
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typedef struct AVCodecParser {
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int codec_ids[3]; /* several codec IDs are permitted */
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int priv_data_size;
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int (*parser_init)(AVCodecParserContext *s);
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int (*parser_parse)(AVCodecParserContext *s,
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AVCodecContext *avctx,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size);
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void (*parser_close)(AVCodecParserContext *s);
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struct AVCodecParser *next;
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} AVCodecParser;
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extern AVCodecParser *av_first_parser;
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void av_register_codec_parser(AVCodecParser *parser);
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AVCodecParserContext *av_parser_init(int codec_id);
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int av_parser_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size);
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void av_parser_close(AVCodecParserContext *s);
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extern AVCodecParser mpegvideo_parser;
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extern AVCodecParser mpeg4video_parser;
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extern AVCodecParser h263_parser;
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extern AVCodecParser h264_parser;
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extern AVCodecParser mpegaudio_parser;
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extern AVCodecParser ac3_parser;
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/* memory */
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void *av_malloc(unsigned int size);
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void *av_mallocz(unsigned int size);
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892
libavcodec/parser.c
Normal file
892
libavcodec/parser.c
Normal file
@ -0,0 +1,892 @@
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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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avcodec.h"
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#include "mpegvideo.h"
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#include "mpegaudio.h"
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AVCodecParser *av_first_parser = NULL;
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void av_register_codec_parser(AVCodecParser *parser)
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{
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parser->next = av_first_parser;
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av_first_parser = parser;
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}
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AVCodecParserContext *av_parser_init(int codec_id)
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{
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AVCodecParserContext *s;
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AVCodecParser *parser;
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int ret;
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for(parser = av_first_parser; parser != NULL; parser = parser->next) {
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if (parser->codec_ids[0] == codec_id ||
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parser->codec_ids[1] == codec_id ||
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parser->codec_ids[2] == codec_id)
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goto found;
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}
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return NULL;
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found:
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s = av_mallocz(sizeof(AVCodecParserContext));
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if (!s)
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return NULL;
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s->parser = parser;
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s->priv_data = av_mallocz(parser->priv_data_size);
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if (!s->priv_data) {
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av_free(s);
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return NULL;
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}
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if (parser->parser_init) {
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ret = parser->parser_init(s);
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if (ret != 0) {
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av_free(s->priv_data);
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av_free(s);
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return NULL;
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}
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}
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return s;
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}
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int av_parser_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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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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int index;
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/* WARNING: the returned index can be negative */
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index = s->parser->parser_parse(s, avctx, poutbuf, poutbuf_size, buf, buf_size);
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/* update the file pointer */
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if (*poutbuf_size) {
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s->frame_offset = s->last_frame_offset;
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s->last_frame_offset = s->cur_offset + index;
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}
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if (index < 0)
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index = 0;
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s->cur_offset += index;
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return index;
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}
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void av_parser_close(AVCodecParserContext *s)
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{
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if (s->parser->parser_close)
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s->parser->parser_close(s);
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av_free(s->priv_data);
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av_free(s);
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}
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/*****************************************************/
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//#define END_NOT_FOUND (-100)
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#define PICTURE_START_CODE 0x00000100
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#define SEQ_START_CODE 0x000001b3
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#define EXT_START_CODE 0x000001b5
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#define SLICE_MIN_START_CODE 0x00000101
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#define SLICE_MAX_START_CODE 0x000001af
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typedef struct ParseContext1{
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uint8_t *buffer;
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int index;
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int last_index;
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int buffer_size;
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uint32_t state; ///< contains the last few bytes in MSB order
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int frame_start_found;
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int overread; ///< the number of bytes which where irreversibly read from the next frame
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int overread_index; ///< the index into ParseContext1.buffer of the overreaded bytes
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/* MPEG2 specific */
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int frame_rate;
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int progressive_sequence;
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int width, height;
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/* XXX: suppress that, needed by MPEG4 */
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MpegEncContext *enc;
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} ParseContext1;
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/**
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* combines the (truncated) bitstream to a complete frame
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* @returns -1 if no complete frame could be created
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*/
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static int ff_combine_frame1(ParseContext1 *pc, int next, uint8_t **buf, int *buf_size)
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{
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#if 0
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if(pc->overread){
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printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
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printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
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}
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#endif
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/* copy overreaded bytes from last frame into buffer */
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for(; pc->overread>0; pc->overread--){
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pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
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}
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pc->last_index= pc->index;
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/* copy into buffer end return */
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if(next == END_NOT_FOUND){
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pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(&pc->buffer[pc->index], *buf, *buf_size);
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pc->index += *buf_size;
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return -1;
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}
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*buf_size=
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pc->overread_index= pc->index + next;
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/* append to buffer */
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if(pc->index){
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pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
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pc->index = 0;
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*buf= pc->buffer;
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}
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/* store overread bytes */
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for(;next < 0; next++){
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pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next];
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pc->overread++;
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}
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#if 0
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if(pc->overread){
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printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index);
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printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]);
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}
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#endif
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return 0;
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}
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/**
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* finds the end of the current frame in the bitstream.
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* @return the position of the first byte of the next frame, or -1
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*/
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static int mpeg1_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size)
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{
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int i;
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uint32_t state;
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state= pc->state;
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i=0;
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if(!pc->frame_start_found){
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for(i=0; i<buf_size; i++){
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state= (state<<8) | buf[i];
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if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
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i++;
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pc->frame_start_found=1;
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break;
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}
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}
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}
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if(pc->frame_start_found){
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for(; i<buf_size; i++){
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state= (state<<8) | buf[i];
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if((state&0xFFFFFF00) == 0x100){
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if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
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pc->frame_start_found=0;
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pc->state=-1;
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return i-3;
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}
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}
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}
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}
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pc->state= state;
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return END_NOT_FOUND;
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}
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static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
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{
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const uint8_t *buf_ptr;
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unsigned int state=0xFFFFFFFF, v;
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int val;
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buf_ptr = *pbuf_ptr;
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while (buf_ptr < buf_end) {
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v = *buf_ptr++;
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if (state == 0x000001) {
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state = ((state << 8) | v) & 0xffffff;
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val = state;
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goto found;
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}
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state = ((state << 8) | v) & 0xffffff;
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}
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val = -1;
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found:
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*pbuf_ptr = buf_ptr;
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return val;
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}
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/* XXX: merge with libavcodec ? */
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#define MPEG1_FRAME_RATE_BASE 1001
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static const int frame_rate_tab[16] = {
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0,
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24000,
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24024,
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25025,
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30000,
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30030,
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50050,
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60000,
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60060,
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// Xing's 15fps: (9)
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15015,
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// libmpeg3's "Unofficial economy rates": (10-13)
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5005,
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10010,
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12012,
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15015,
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// random, just to avoid segfault !never encode these
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25025,
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25025,
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};
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static void mpegvideo_extract_headers(AVCodecParserContext *s,
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AVCodecContext *avctx,
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const uint8_t *buf, int buf_size)
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{
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ParseContext1 *pc = s->priv_data;
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const uint8_t *buf_end;
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int32_t start_code;
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int frame_rate_index, ext_type, bytes_left;
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int frame_rate_ext_n, frame_rate_ext_d;
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int top_field_first, repeat_first_field, progressive_frame;
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int horiz_size_ext, vert_size_ext;
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s->repeat_pict = 0;
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buf_end = buf + buf_size;
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while (buf < buf_end) {
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start_code = find_start_code(&buf, buf_end);
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bytes_left = buf_end - buf;
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switch(start_code) {
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case PICTURE_START_CODE:
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if (bytes_left >= 2) {
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s->pict_type = (buf[1] >> 3) & 7;
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}
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break;
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case SEQ_START_CODE:
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if (bytes_left >= 4) {
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pc->width = avctx->width = (buf[0] << 4) | (buf[1] >> 4);
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pc->height = avctx->height = ((buf[1] & 0x0f) << 8) | buf[2];
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frame_rate_index = buf[3] & 0xf;
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pc->frame_rate = avctx->frame_rate = frame_rate_tab[frame_rate_index];
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avctx->frame_rate_base = MPEG1_FRAME_RATE_BASE;
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}
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break;
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case EXT_START_CODE:
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if (bytes_left >= 1) {
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ext_type = (buf[0] >> 4);
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switch(ext_type) {
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case 0x1: /* sequence extension */
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if (bytes_left >= 6) {
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horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
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vert_size_ext = (buf[2] >> 5) & 3;
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frame_rate_ext_n = (buf[5] >> 5) & 3;
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frame_rate_ext_d = (buf[5] & 0x1f);
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pc->progressive_sequence = buf[1] & (1 << 3);
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avctx->width = pc->width | (horiz_size_ext << 12);
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avctx->height = pc->height | (vert_size_ext << 12);
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avctx->frame_rate = pc->frame_rate * (frame_rate_ext_n + 1);
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avctx->frame_rate_base = MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d + 1);
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avctx->sub_id = 2; /* forces MPEG2 */
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}
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break;
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case 0x8: /* picture coding extension */
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if (bytes_left >= 5) {
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top_field_first = buf[3] & (1 << 7);
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repeat_first_field = buf[3] & (1 << 1);
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progressive_frame = buf[4] & (1 << 7);
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/* check if we must repeat the frame */
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if (repeat_first_field) {
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if (pc->progressive_sequence) {
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if (top_field_first)
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s->repeat_pict = 4;
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else
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s->repeat_pict = 2;
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} else if (progressive_frame) {
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s->repeat_pict = 1;
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}
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}
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}
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break;
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}
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}
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break;
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case -1:
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goto the_end;
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default:
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/* we stop parsing when we encounter a slice. It ensures
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that this function takes a negligible amount of time */
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if (start_code >= SLICE_MIN_START_CODE &&
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start_code <= SLICE_MAX_START_CODE)
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goto the_end;
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break;
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}
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}
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the_end: ;
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}
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static int mpegvideo_parse(AVCodecParserContext *s,
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AVCodecContext *avctx,
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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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ParseContext1 *pc = s->priv_data;
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int next;
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next= mpeg1_find_frame_end(pc, buf, buf_size);
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if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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/* we have a full frame : we just parse the first few MPEG headers
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to have the full timing information. The time take by this
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||||
function should be negligible for uncorrupted streams */
|
||||
mpegvideo_extract_headers(s, avctx, buf, buf_size);
|
||||
#if 0
|
||||
printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
|
||||
s->pict_type, (double)avctx->frame_rate / avctx->frame_rate_base, s->repeat_pict);
|
||||
#endif
|
||||
|
||||
*poutbuf = (uint8_t *)buf;
|
||||
*poutbuf_size = buf_size;
|
||||
return next;
|
||||
}
|
||||
|
||||
static void mpegvideo_parse_close(AVCodecParserContext *s)
|
||||
{
|
||||
ParseContext1 *pc = s->priv_data;
|
||||
|
||||
av_free(pc->buffer);
|
||||
av_free(pc->enc);
|
||||
}
|
||||
|
||||
/*************************/
|
||||
|
||||
/**
|
||||
* finds the end of the current frame in the bitstream.
|
||||
* @return the position of the first byte of the next frame, or -1
|
||||
*/
|
||||
static int mpeg4_find_frame_end(ParseContext1 *pc,
|
||||
const uint8_t *buf, int buf_size)
|
||||
{
|
||||
int vop_found, i;
|
||||
uint32_t state;
|
||||
|
||||
vop_found= pc->frame_start_found;
|
||||
state= pc->state;
|
||||
|
||||
i=0;
|
||||
if(!vop_found){
|
||||
for(i=0; i<buf_size; i++){
|
||||
state= (state<<8) | buf[i];
|
||||
if(state == 0x1B6){
|
||||
i++;
|
||||
vop_found=1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if(vop_found){
|
||||
for(; i<buf_size; i++){
|
||||
state= (state<<8) | buf[i];
|
||||
if((state&0xFFFFFF00) == 0x100){
|
||||
pc->frame_start_found=0;
|
||||
pc->state=-1;
|
||||
return i-3;
|
||||
}
|
||||
}
|
||||
}
|
||||
pc->frame_start_found= vop_found;
|
||||
pc->state= state;
|
||||
return END_NOT_FOUND;
|
||||
}
|
||||
|
||||
/* used by parser */
|
||||
/* XXX: make it use less memory */
|
||||
static int av_mpeg4_decode_header(AVCodecParserContext *s1,
|
||||
AVCodecContext *avctx,
|
||||
const uint8_t *buf, int buf_size)
|
||||
{
|
||||
ParseContext1 *pc = s1->priv_data;
|
||||
MpegEncContext *s = pc->enc;
|
||||
GetBitContext gb1, *gb = &gb1;
|
||||
int ret;
|
||||
|
||||
s->avctx = avctx;
|
||||
init_get_bits(gb, buf, 8 * buf_size);
|
||||
ret = ff_mpeg4_decode_picture_header(s, gb);
|
||||
if (s->width) {
|
||||
avctx->width = s->width;
|
||||
avctx->height = s->height;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int mpeg4video_parse_init(AVCodecParserContext *s)
|
||||
{
|
||||
ParseContext1 *pc = s->priv_data;
|
||||
pc->enc = av_mallocz(sizeof(MpegEncContext));
|
||||
if (!pc->enc)
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mpeg4video_parse(AVCodecParserContext *s,
|
||||
AVCodecContext *avctx,
|
||||
uint8_t **poutbuf, int *poutbuf_size,
|
||||
const uint8_t *buf, int buf_size)
|
||||
{
|
||||
ParseContext1 *pc = s->priv_data;
|
||||
int next;
|
||||
|
||||
next= mpeg4_find_frame_end(pc, buf, buf_size);
|
||||
|
||||
if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
|
||||
*poutbuf = NULL;
|
||||
*poutbuf_size = 0;
|
||||
return buf_size;
|
||||
}
|
||||
av_mpeg4_decode_header(s, avctx, buf, buf_size);
|
||||
|
||||
*poutbuf = (uint8_t *)buf;
|
||||
*poutbuf_size = buf_size;
|
||||
return next;
|
||||
}
|
||||
|
||||
/*************************/
|
||||
|
||||
static int h263_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size)
|
||||
{
|
||||
int vop_found, i;
|
||||
uint32_t state;
|
||||
|
||||
vop_found= pc->frame_start_found;
|
||||
state= pc->state;
|
||||
|
||||
i=0;
|
||||
if(!vop_found){
|
||||
for(i=0; i<buf_size; i++){
|
||||
state= (state<<8) | buf[i];
|
||||
if(state>>(32-22) == 0x20){
|
||||
i++;
|
||||
vop_found=1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if(vop_found){
|
||||
for(; i<buf_size; i++){
|
||||
state= (state<<8) | buf[i];
|
||||
if(state>>(32-22) == 0x20){
|
||||
pc->frame_start_found=0;
|
||||
pc->state=-1;
|
||||
return i-3;
|
||||
}
|
||||
}
|
||||
}
|
||||
pc->frame_start_found= vop_found;
|
||||
pc->state= state;
|
||||
|
||||
return END_NOT_FOUND;
|
||||
}
|
||||
|
||||
static int h263_parse(AVCodecParserContext *s,
|
||||
AVCodecContext *avctx,
|
||||
uint8_t **poutbuf, int *poutbuf_size,
|
||||
const uint8_t *buf, int buf_size)
|
||||
{
|
||||
ParseContext1 *pc = s->priv_data;
|
||||
int next;
|
||||
|
||||
next= h263_find_frame_end(pc, buf, buf_size);
|
||||
|
||||
if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
|
||||
*poutbuf = NULL;
|
||||
*poutbuf_size = 0;
|
||||
return buf_size;
|
||||
}
|
||||
|
||||
*poutbuf = (uint8_t *)buf;
|
||||
*poutbuf_size = buf_size;
|
||||
return next;
|
||||
}
|
||||
|
||||
/*************************/
|
||||
|
||||
/**
|
||||
* finds the end of the current frame in the bitstream.
|
||||
* @return the position of the first byte of the next frame, or -1
|
||||
*/
|
||||
static int h264_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size)
|
||||
{
|
||||
int i;
|
||||
uint32_t state;
|
||||
//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
|
||||
// mb_addr= pc->mb_addr - 1;
|
||||
state= pc->state;
|
||||
//FIXME this will fail with slices
|
||||
for(i=0; i<buf_size; i++){
|
||||
state= (state<<8) | buf[i];
|
||||
if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){
|
||||
if(pc->frame_start_found){
|
||||
pc->state=-1;
|
||||
pc->frame_start_found= 0;
|
||||
return i-3;
|
||||
}
|
||||
pc->frame_start_found= 1;
|
||||
}
|
||||
}
|
||||
|
||||
pc->state= state;
|
||||
return END_NOT_FOUND;
|
||||
}
|
||||
|
||||
static int h264_parse(AVCodecParserContext *s,
|
||||
AVCodecContext *avctx,
|
||||
uint8_t **poutbuf, int *poutbuf_size,
|
||||
const uint8_t *buf, int buf_size)
|
||||
{
|
||||
ParseContext1 *pc = s->priv_data;
|
||||
int next;
|
||||
|
||||
next= h264_find_frame_end(pc, buf, buf_size);
|
||||
|
||||
if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
|
||||
*poutbuf = NULL;
|
||||
*poutbuf_size = 0;
|
||||
return buf_size;
|
||||
}
|
||||
|
||||
*poutbuf = (uint8_t *)buf;
|
||||
*poutbuf_size = buf_size;
|
||||
return next;
|
||||
}
|
||||
|
||||
/*************************/
|
||||
|
||||
typedef struct MpegAudioParseContext {
|
||||
uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */
|
||||
uint8_t *inbuf_ptr;
|
||||
int frame_size;
|
||||
int free_format_frame_size;
|
||||
int free_format_next_header;
|
||||
} MpegAudioParseContext;
|
||||
|
||||
#define MPA_HEADER_SIZE 4
|
||||
|
||||
/* header + layer + bitrate + freq + lsf/mpeg25 */
|
||||
#define SAME_HEADER_MASK \
|
||||
(0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19))
|
||||
|
||||
static int mpegaudio_parse_init(AVCodecParserContext *s1)
|
||||
{
|
||||
MpegAudioParseContext *s = s1->priv_data;
|
||||
s->inbuf_ptr = s->inbuf;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mpegaudio_parse(AVCodecParserContext *s1,
|
||||
AVCodecContext *avctx,
|
||||
uint8_t **poutbuf, int *poutbuf_size,
|
||||
const uint8_t *buf, int buf_size)
|
||||
{
|
||||
MpegAudioParseContext *s = s1->priv_data;
|
||||
int len, ret;
|
||||
uint32_t header;
|
||||
const uint8_t *buf_ptr;
|
||||
|
||||
*poutbuf = NULL;
|
||||
*poutbuf_size = 0;
|
||||
buf_ptr = buf;
|
||||
while (buf_size > 0) {
|
||||
len = s->inbuf_ptr - s->inbuf;
|
||||
if (s->frame_size == 0) {
|
||||
/* special case for next header for first frame in free
|
||||
format case (XXX: find a simpler method) */
|
||||
if (s->free_format_next_header != 0) {
|
||||
s->inbuf[0] = s->free_format_next_header >> 24;
|
||||
s->inbuf[1] = s->free_format_next_header >> 16;
|
||||
s->inbuf[2] = s->free_format_next_header >> 8;
|
||||
s->inbuf[3] = s->free_format_next_header;
|
||||
s->inbuf_ptr = s->inbuf + 4;
|
||||
s->free_format_next_header = 0;
|
||||
goto got_header;
|
||||
}
|
||||
/* no header seen : find one. We need at least MPA_HEADER_SIZE
|
||||
bytes to parse it */
|
||||
len = MPA_HEADER_SIZE - len;
|
||||
if (len > buf_size)
|
||||
len = buf_size;
|
||||
if (len > 0) {
|
||||
memcpy(s->inbuf_ptr, buf_ptr, len);
|
||||
buf_ptr += len;
|
||||
buf_size -= len;
|
||||
s->inbuf_ptr += len;
|
||||
}
|
||||
if ((s->inbuf_ptr - s->inbuf) >= MPA_HEADER_SIZE) {
|
||||
got_header:
|
||||
header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
|
||||
(s->inbuf[2] << 8) | s->inbuf[3];
|
||||
|
||||
ret = mpa_decode_header(avctx, header);
|
||||
if (ret < 0) {
|
||||
/* no sync found : move by one byte (inefficient, but simple!) */
|
||||
memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
|
||||
s->inbuf_ptr--;
|
||||
dprintf("skip %x\n", header);
|
||||
/* reset free format frame size to give a chance
|
||||
to get a new bitrate */
|
||||
s->free_format_frame_size = 0;
|
||||
} else {
|
||||
s->frame_size = ret;
|
||||
#if 0
|
||||
/* free format: prepare to compute frame size */
|
||||
if (decode_header(s, header) == 1) {
|
||||
s->frame_size = -1;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
}
|
||||
} else
|
||||
#if 0
|
||||
if (s->frame_size == -1) {
|
||||
/* free format : find next sync to compute frame size */
|
||||
len = MPA_MAX_CODED_FRAME_SIZE - len;
|
||||
if (len > buf_size)
|
||||
len = buf_size;
|
||||
if (len == 0) {
|
||||
/* frame too long: resync */
|
||||
s->frame_size = 0;
|
||||
memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
|
||||
s->inbuf_ptr--;
|
||||
} else {
|
||||
uint8_t *p, *pend;
|
||||
uint32_t header1;
|
||||
int padding;
|
||||
|
||||
memcpy(s->inbuf_ptr, buf_ptr, len);
|
||||
/* check for header */
|
||||
p = s->inbuf_ptr - 3;
|
||||
pend = s->inbuf_ptr + len - 4;
|
||||
while (p <= pend) {
|
||||
header = (p[0] << 24) | (p[1] << 16) |
|
||||
(p[2] << 8) | p[3];
|
||||
header1 = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
|
||||
(s->inbuf[2] << 8) | s->inbuf[3];
|
||||
/* check with high probability that we have a
|
||||
valid header */
|
||||
if ((header & SAME_HEADER_MASK) ==
|
||||
(header1 & SAME_HEADER_MASK)) {
|
||||
/* header found: update pointers */
|
||||
len = (p + 4) - s->inbuf_ptr;
|
||||
buf_ptr += len;
|
||||
buf_size -= len;
|
||||
s->inbuf_ptr = p;
|
||||
/* compute frame size */
|
||||
s->free_format_next_header = header;
|
||||
s->free_format_frame_size = s->inbuf_ptr - s->inbuf;
|
||||
padding = (header1 >> 9) & 1;
|
||||
if (s->layer == 1)
|
||||
s->free_format_frame_size -= padding * 4;
|
||||
else
|
||||
s->free_format_frame_size -= padding;
|
||||
dprintf("free frame size=%d padding=%d\n",
|
||||
s->free_format_frame_size, padding);
|
||||
decode_header(s, header1);
|
||||
goto next_data;
|
||||
}
|
||||
p++;
|
||||
}
|
||||
/* not found: simply increase pointers */
|
||||
buf_ptr += len;
|
||||
s->inbuf_ptr += len;
|
||||
buf_size -= len;
|
||||
}
|
||||
} else
|
||||
#endif
|
||||
if (len < s->frame_size) {
|
||||
if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE)
|
||||
s->frame_size = MPA_MAX_CODED_FRAME_SIZE;
|
||||
len = s->frame_size - len;
|
||||
if (len > buf_size)
|
||||
len = buf_size;
|
||||
memcpy(s->inbuf_ptr, buf_ptr, len);
|
||||
buf_ptr += len;
|
||||
s->inbuf_ptr += len;
|
||||
buf_size -= len;
|
||||
}
|
||||
// next_data:
|
||||
if (s->frame_size > 0 &&
|
||||
(s->inbuf_ptr - s->inbuf) >= s->frame_size) {
|
||||
*poutbuf = s->inbuf;
|
||||
*poutbuf_size = s->inbuf_ptr - s->inbuf;
|
||||
s->inbuf_ptr = s->inbuf;
|
||||
s->frame_size = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return buf_ptr - buf;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_AC3
|
||||
extern int a52_syncinfo (const uint8_t * buf, int * flags,
|
||||
int * sample_rate, int * bit_rate);
|
||||
|
||||
typedef struct AC3ParseContext {
|
||||
uint8_t inbuf[4096]; /* input buffer */
|
||||
uint8_t *inbuf_ptr;
|
||||
int frame_size;
|
||||
int flags;
|
||||
} AC3ParseContext;
|
||||
|
||||
#define AC3_HEADER_SIZE 7
|
||||
#define A52_LFE 16
|
||||
|
||||
static int ac3_parse_init(AVCodecParserContext *s1)
|
||||
{
|
||||
AC3ParseContext *s = s1->priv_data;
|
||||
s->inbuf_ptr = s->inbuf;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ac3_parse(AVCodecParserContext *s1,
|
||||
AVCodecContext *avctx,
|
||||
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;
|
||||
static const int ac3_channels[8] = {
|
||||
2, 1, 2, 3, 3, 4, 4, 5
|
||||
};
|
||||
|
||||
*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 7 bytes to parse it */
|
||||
len = AC3_HEADER_SIZE - len;
|
||||
if (len > buf_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) == AC3_HEADER_SIZE) {
|
||||
len = a52_syncinfo(s->inbuf, &s->flags, &sample_rate, &bit_rate);
|
||||
if (len == 0) {
|
||||
/* no sync found : move by one byte (inefficient, but simple!) */
|
||||
memmove(s->inbuf, s->inbuf + 1, AC3_HEADER_SIZE - 1);
|
||||
s->inbuf_ptr--;
|
||||
} else {
|
||||
s->frame_size = len;
|
||||
/* update codec info */
|
||||
avctx->sample_rate = sample_rate;
|
||||
avctx->channels = ac3_channels[s->flags & 7];
|
||||
if (s->flags & A52_LFE)
|
||||
avctx->channels++;
|
||||
avctx->bit_rate = bit_rate;
|
||||
avctx->frame_size = 6 * 256;
|
||||
}
|
||||
}
|
||||
} else if (len < s->frame_size) {
|
||||
len = s->frame_size - len;
|
||||
if (len > buf_size)
|
||||
len = buf_size;
|
||||
|
||||
memcpy(s->inbuf_ptr, buf_ptr, len);
|
||||
buf_ptr += len;
|
||||
s->inbuf_ptr += len;
|
||||
buf_size -= len;
|
||||
} else {
|
||||
*poutbuf = s->inbuf;
|
||||
*poutbuf_size = s->frame_size;
|
||||
s->inbuf_ptr = s->inbuf;
|
||||
s->frame_size = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return buf_ptr - buf;
|
||||
}
|
||||
#endif
|
||||
|
||||
AVCodecParser mpegvideo_parser = {
|
||||
{ CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
|
||||
sizeof(ParseContext1),
|
||||
NULL,
|
||||
mpegvideo_parse,
|
||||
mpegvideo_parse_close,
|
||||
};
|
||||
|
||||
AVCodecParser mpeg4video_parser = {
|
||||
{ CODEC_ID_MPEG4 },
|
||||
sizeof(ParseContext1),
|
||||
mpeg4video_parse_init,
|
||||
mpeg4video_parse,
|
||||
mpegvideo_parse_close,
|
||||
};
|
||||
|
||||
AVCodecParser h263_parser = {
|
||||
{ CODEC_ID_H263 },
|
||||
sizeof(ParseContext1),
|
||||
NULL,
|
||||
h263_parse,
|
||||
mpegvideo_parse_close,
|
||||
};
|
||||
|
||||
AVCodecParser h264_parser = {
|
||||
{ CODEC_ID_H264 },
|
||||
sizeof(ParseContext1),
|
||||
NULL,
|
||||
h264_parse,
|
||||
mpegvideo_parse_close,
|
||||
};
|
||||
|
||||
AVCodecParser mpegaudio_parser = {
|
||||
{ CODEC_ID_MP2, CODEC_ID_MP3 },
|
||||
sizeof(MpegAudioParseContext),
|
||||
mpegaudio_parse_init,
|
||||
mpegaudio_parse,
|
||||
NULL,
|
||||
};
|
||||
|
||||
#ifdef CONFIG_AC3
|
||||
AVCodecParser ac3_parser = {
|
||||
{ CODEC_ID_AC3 },
|
||||
sizeof(AC3ParseContext),
|
||||
ac3_parse_init,
|
||||
ac3_parse,
|
||||
NULL,
|
||||
};
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user