247 lines
7.4 KiB
C
247 lines
7.4 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"
|
|
|
|
const AVRational avs2_fps_tab[] = {
|
|
{ 0, 0},
|
|
{1001, 24000},
|
|
{ 1, 24},
|
|
{ 1, 25},
|
|
{1001, 30000},
|
|
{ 1, 30},
|
|
{ 1, 50},
|
|
{1001, 60000},
|
|
{ 1, 60},
|
|
{ 1, 100},
|
|
{ 1, 120},
|
|
{ 1, 200},
|
|
{ 1, 240},
|
|
{ 1, 300},
|
|
{ 0, 0},
|
|
};
|
|
|
|
/**
|
|
* 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&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 const uint8_t *ff_find_start_code(const uint8_t * restrict p, const uint8_t *end, uint32_t * restrict state){
|
|
int i;
|
|
|
|
assert(p<=end);
|
|
if(p>=end)
|
|
return end;
|
|
|
|
for(i=0; i<3; i++){
|
|
uint32_t tmp= *state << 8;
|
|
*state= tmp + *(p++);
|
|
if(tmp == 0x100 || p==end)
|
|
return p;
|
|
}
|
|
|
|
while(p<end){
|
|
if (p[-1] > 1 ) p+= 3;
|
|
else if(p[-2] ) p+= 2;
|
|
else if(p[-3]|(p[-1]-1)) p++;
|
|
else{
|
|
p++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
p= FFMIN(p, end)-4;
|
|
*state= AV_RB32(p);
|
|
|
|
return p+4;
|
|
}
|
|
|
|
|
|
static void cavs2video_extract_headers(AVCodecParserContext *s,
|
|
AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
ParseContext1 *pc = s->priv_data;
|
|
const uint8_t *buf_end = buf + buf_size;
|
|
int bytes_left, start_code = -1;
|
|
int profile_id, level_id, progressive_seq, field_coded_seq;
|
|
int chroma_format, sample_precision, enc_precision;
|
|
int aspect_ratio, frame_rate_code;
|
|
|
|
//av_log(NULL, AV_LOG_INFO, "%s\n", __FUNCTION__);
|
|
|
|
while (buf < buf_end) {
|
|
buf = ff_find_start_code(buf, buf_end, &start_code);
|
|
bytes_left = buf_end - buf;
|
|
|
|
//av_log(NULL, AV_LOG_INFO, "%s, start_code=0x%x\n", __FUNCTION__, start_code);
|
|
|
|
switch (start_code) {
|
|
case CAVS_START_CODE:
|
|
profile_id = AV_RB8(buf);
|
|
level_id = AV_RB8(buf + 1);
|
|
progressive_seq = AV_RB16(buf + 2) >> 15;
|
|
field_coded_seq = AV_RB16(buf + 2) >> 14 & 0x1;
|
|
chroma_format = AV_RB16(buf + 4) & 0x3;
|
|
sample_precision = AV_RB16(buf + 6) >> 13;
|
|
aspect_ratio = AV_RB16(buf + 6) >> 6 & 0xf;
|
|
frame_rate_code = AV_RB16(buf + 6) >> 2 & 0xf;
|
|
|
|
if (profile_id == 0x22)
|
|
enc_precision = AV_RB16(buf + 6) >> 10 & 0x3;
|
|
|
|
avctx->width = AV_RB16(buf + 2) & 0x3fff;
|
|
avctx->height = AV_RB16(buf + 4) >> 2 & 0x3fff;
|
|
avctx->time_base.den = avs2_fps_tab[frame_rate_code].den;
|
|
avctx->time_base.num = avs2_fps_tab[frame_rate_code].num;
|
|
av_log(NULL, AV_LOG_INFO, "%s,Get CAVS_START_CODE: profile_id=%d, level_id=%d \n", __FUNCTION__, profile_id, level_id);
|
|
av_log(NULL, AV_LOG_INFO, "progressive_seq=%d, field_coded_seq=%d, chroma_format=%d\n",
|
|
progressive_seq, field_coded_seq, chroma_format);
|
|
av_log(NULL, AV_LOG_INFO, "sample_precision=%d, aspect_ratio=%d, frame_rate_code=%d\n",
|
|
sample_precision, aspect_ratio, frame_rate_code);
|
|
av_log(NULL, AV_LOG_INFO, "avctx->time_base.den=%d, avctx->time_base.num=%d, width=%d, height=%d\n",
|
|
avctx->time_base.den, avctx->time_base.num, avctx->width, avctx->height);
|
|
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static int cavs2video_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;
|
|
|
|
//av_log(NULL, AV_LOG_INFO, "%s\n", __FUNCTION__);
|
|
|
|
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;
|
|
//av_log(NULL, AV_LOG_INFO, "%s, buf_size=%d, return\n", __FUNCTION__, buf_size);
|
|
return buf_size;
|
|
}
|
|
}
|
|
|
|
if (1) cavs2video_extract_headers(s, avctx, buf, buf_size);
|
|
//avctx->time_base.den = 30000;
|
|
//avctx->time_base.num = 1000;
|
|
|
|
*poutbuf = buf;
|
|
*poutbuf_size = buf_size;
|
|
return next;
|
|
}
|
|
|
|
AVCodecParser ff_cavs2video_parser = {
|
|
.codec_ids = { AV_CODEC_ID_CAVS2 },
|
|
.priv_data_size = sizeof(ParseContext1),
|
|
.parser_parse = cavs2video_parse,
|
|
.parser_close = ff_parse_close,
|
|
.split = ff_mpeg4video_split,
|
|
};
|
|
|
|
AVCodecParser ff_cavsvideo_parser = {
|
|
.codec_ids = { AV_CODEC_ID_CAVS },
|
|
.priv_data_size = sizeof(ParseContext),
|
|
.parser_parse = cavsvideo_parse,
|
|
.parser_close = ff_parse_close,
|
|
.split = ff_mpeg4video_split,
|
|
};
|