/* * 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"/** * Find 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 == PIC_I_START_CODE || state == PIC_PB_START_CODE || state == CAVS_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;}const AVCodecParser ff_cavsvideo_parser = { .codec_ids = { AV_CODEC_ID_CAVS }, .priv_data_size = sizeof(ParseContext), .parser_parse = cavsvideo_parse, .parser_close = ff_parse_close,};
/*
* 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"
/**
* Find 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 == PIC_I_START_CODE || state == PIC_PB_START_CODE ||
state == CAVS_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;
}
const AVCodecParser ff_cavsvideo_parser = {
.codec_ids = { AV_CODEC_ID_CAVS },
.priv_data_size = sizeof(ParseContext),
.parser_parse = cavsvideo_parse,
.parser_close = ff_parse_close,
};