mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*
|
|
* AVS2-P2/IEEE1857.4 video parser.
|
|
* Copyright (c) 2018 Huiwen Ren <hwrenx@gmail.com>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "parser.h"
|
|
|
|
#define SLICE_MAX_START_CODE 0x000001af
|
|
|
|
#define ISPIC(x) ((x) == 0xB3 || (x) == 0xB6)
|
|
#define ISUNIT(x) ((x) == 0xB0 || (x) == 0xB1 || (x) == 0xB2 || ISPIC(x))
|
|
|
|
static int avs2_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
|
|
{
|
|
int pic_found = pc->frame_start_found;
|
|
uint32_t state = pc->state;
|
|
int cur = 0;
|
|
|
|
if (!pic_found) {
|
|
for (; cur < buf_size; ++cur) {
|
|
state = (state<<8) | buf[cur];
|
|
if (ISUNIT(buf[cur])){
|
|
++cur;
|
|
pic_found = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (pic_found) {
|
|
if (!buf_size)
|
|
return END_NOT_FOUND;
|
|
for (; cur < buf_size; ++cur) {
|
|
state = (state << 8) | buf[cur];
|
|
if ((state & 0xFFFFFF00) == 0x100 && state > SLICE_MAX_START_CODE) {
|
|
pc->frame_start_found = 0;
|
|
pc->state = -1;
|
|
return cur - 3;
|
|
}
|
|
}
|
|
}
|
|
|
|
pc->frame_start_found = pic_found;
|
|
pc->state = state;
|
|
|
|
return END_NOT_FOUND;
|
|
}
|
|
|
|
static int avs2_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 = avs2_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_avs2_parser = {
|
|
.codec_ids = { AV_CODEC_ID_AVS2 },
|
|
.priv_data_size = sizeof(ParseContext),
|
|
.parser_parse = avs2_parse,
|
|
.parser_close = ff_parse_close,
|
|
.split = ff_mpeg4video_split,
|
|
};
|