mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
e7e2df27f8
None of these symbols should be accessed directly, so declare them as
hidden.
Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit d36beb3f69)
108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/*
|
|
* Chinese AVS video (AVS1-P2, JiZhun profile) parser.
|
|
* Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
|
|
*
|
|
* 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
|
|
* Chinese AVS video (AVS1-P2, JiZhun profile) parser
|
|
* @author Stefan Gehrer <stefan.gehrer@gmx.de>
|
|
*/
|
|
|
|
#include "parser.h"
|
|
#include "cavs.h"
|
|
|
|
|
|
/**
|
|
* 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 cavs_find_frame_end(ParseContext *pc, const uint8_t *buf,
|
|
int buf_size) {
|
|
int pic_found, i;
|
|
uint32_t state;
|
|
|
|
pic_found= pc->frame_start_found;
|
|
state= pc->state;
|
|
|
|
i=0;
|
|
if(!pic_found){
|
|
for(i=0; i<buf_size; i++){
|
|
state= (state<<8) | buf[i];
|
|
if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){
|
|
i++;
|
|
pic_found=1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(pic_found){
|
|
/* EOF considered as end of frame */
|
|
if (buf_size == 0)
|
|
return 0;
|
|
for(; i<buf_size; i++){
|
|
state= (state<<8) | buf[i];
|
|
if((state&0xFFFFFF00) == 0x100){
|
|
if(state > SLICE_MAX_START_CODE){
|
|
pc->frame_start_found=0;
|
|
pc->state=-1;
|
|
return i-3;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
pc->frame_start_found= pic_found;
|
|
pc->state= state;
|
|
return END_NOT_FOUND;
|
|
}
|
|
|
|
static int cavsvideo_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= cavs_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;
|
|
}
|
|
|
|
AVCodecParser ff_cavsvideo_parser = {
|
|
{ CODEC_ID_CAVS },
|
|
sizeof(ParseContext1),
|
|
NULL,
|
|
cavsvideo_parse,
|
|
ff_parse1_close,
|
|
ff_mpeg4video_split,
|
|
};
|