mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-30 22:50:48 +00:00
988f585fcb
* qatar/master: (44 commits) replacement Indeo 3 decoder gsm demuxer: do not allocate packet twice. flvenc: use first packet delay as global delay. ac3enc: doxygen update. imc: return error codes instead of 0 for error conditions. imc: return meaningful error codes instead of -1 imc: do not set channel layout for stereo imc: validate channel count imc: check for ff_fft_init() failure imc: check output buffer size before decoding imc: use DSPContext.bswap16_buf() to byte-swap packet data rtsp: add allowed_media_types option libgsm: add flush function to reset the decoder state when seeking libgsm: simplify decoding by using a loop gsm: log error message when packet is too small libgsmdec: do not needlessly set *data_size to 0 gsmdec: do not needlessly set *data_size to 0 gsmdec: add flush function to reset the decoder state when seeking libgsmdec: check output buffer size before decoding gsmdec: log error message when output buffer is too small. ... Conflicts: Changelog ffplay.c libavcodec/indeo3.c libavcodec/mjpeg_parser.c libavcodec/vp3.c libavformat/cutils.c libavformat/id3v2.c libavutil/parseutils.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
|
|
* H261 parser
|
|
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
|
|
* Copyright (c) 2004 Maarten Daniels
|
|
*
|
|
* 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
|
|
* h261codec.
|
|
*/
|
|
|
|
#include "parser.h"
|
|
|
|
|
|
static int h261_find_frame_end(ParseContext *pc, AVCodecContext* avctx, const uint8_t *buf, int buf_size){
|
|
int vop_found, i, j;
|
|
uint32_t state;
|
|
|
|
vop_found= pc->frame_start_found;
|
|
state= pc->state;
|
|
|
|
for(i=0; i<buf_size && !vop_found; i++){
|
|
state= (state<<8) | buf[i];
|
|
for(j=0; j<8; j++){
|
|
if(((state>>j)&0xFFFFF0) == 0x000100){
|
|
vop_found=1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if(vop_found){
|
|
for(; i<buf_size; i++){
|
|
state= (state<<8) | buf[i];
|
|
for(j=0; j<8; j++){
|
|
if(((state>>j)&0xFFFFF0) == 0x000100){
|
|
pc->frame_start_found=0;
|
|
pc->state= (state>>(3*8))+0xFF00;
|
|
return i-2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pc->frame_start_found= vop_found;
|
|
pc->state= state;
|
|
return END_NOT_FOUND;
|
|
}
|
|
|
|
static int h261_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;
|
|
|
|
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
|
|
next = buf_size;
|
|
} else {
|
|
next= h261_find_frame_end(pc,avctx, 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;
|
|
}
|
|
|
|
AVCodecParser ff_h261_parser = {
|
|
.codec_ids = { CODEC_ID_H261 },
|
|
.priv_data_size = sizeof(ParseContext),
|
|
.parser_parse = h261_parse,
|
|
.parser_close = ff_parse_close,
|
|
};
|