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Move H.263 parser to its own file. 

Originally committed as revision 8934 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Diego Biurrun 2007-05-08 08:52:38 +00:00
parent 912f314854
commit c33d98141d
5 changed files with 117 additions and 70 deletions
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1
configure vendored
View File

@ -676,6 +676,7 @@ CMDLINE_SELECT="
dxa_decoder_deps="zlib"
flashsv_decoder_deps="zlib"
flashsv_encoder_deps="zlib"
h263_decoder_deps="h263_parser"
mpeg_xvmc_decoder_deps="xvmc"
png_decoder_deps="zlib"
png_encoder_deps="zlib"

2
libavcodec/Makefile
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@ -282,7 +282,7 @@ OBJS-$(CONFIG_DCA_PARSER) += dca_parser.o
OBJS-$(CONFIG_DVBSUB_PARSER) += dvbsub_parser.o
OBJS-$(CONFIG_DVDSUB_PARSER) += dvdsub_parser.o
OBJS-$(CONFIG_H261_PARSER) += h261_parser.o
OBJS-$(CONFIG_H263_PARSER) += h263dec.o
OBJS-$(CONFIG_H263_PARSER) += h263_parser.o
OBJS-$(CONFIG_H264_PARSER) += h264.o
OBJS-$(CONFIG_MJPEG_PARSER) += mjpeg.o
OBJS-$(CONFIG_MPEG4VIDEO_PARSER) += mpeg4video_parser.o

91
libavcodec/h263_parser.c Normal file
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@ -0,0 +1,91 @@
/*
* H.263 parser
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* 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
*/
/**
* @file h263_parser.c
* H.263 parser
*/
#include "parser.h"
int ff_h263_find_frame_end(ParseContext *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)
{
ParseContext *pc = s->priv_data;
int next;
next= ff_h263_find_frame_end(pc, buf, buf_size);
if (ff_combine_frame(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;
}
AVCodecParser h263_parser = {
{ CODEC_ID_H263 },
sizeof(ParseContext),
NULL,
h263_parse,
ff_parse_close,
};

22
libavcodec/h263_parser.h Normal file
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@ -0,0 +1,22 @@
/*
* H.263 parser
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* 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
*/
int ff_h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);

71
libavcodec/h263dec.c
View File

@ -28,6 +28,7 @@
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "h263_parser.h"
//#define DEBUG
//#define PRINT_FRAME_TIME
@ -358,64 +359,6 @@ int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
return END_NOT_FOUND;
}
static int h263_find_frame_end(ParseContext *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;
}
#ifdef CONFIG_H263_PARSER
static int h263_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
ParseContext *pc = s->priv_data;
int next;
next= h263_find_frame_end(pc, buf, buf_size);
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
*poutbuf = buf;
*poutbuf_size = buf_size;
return next;
}
#endif
int ff_h263_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
@ -454,7 +397,7 @@ uint64_t time= rdtsc();
if(s->codec_id==CODEC_ID_MPEG4){
next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
}else if(s->codec_id==CODEC_ID_H263){
next= h263_find_frame_end(&s->parse_context, buf, buf_size);
next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
}else{
av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
return -1;
@ -902,13 +845,3 @@ AVCodec flv_decoder = {
ff_h263_decode_frame,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
};
#ifdef CONFIG_H263_PARSER
AVCodecParser h263_parser = {
{ CODEC_ID_H263 },
sizeof(ParseContext),
NULL,
h263_parse,
ff_parse_close,
};
#endif