mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
d36beb3f69
None of these symbols should be accessed directly, so declare them as hidden. Signed-off-by: Mans Rullgard <mans@mansr.com>
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/*
|
|
* DNxHD/VC-3 parser
|
|
* Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
|
|
*
|
|
* 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
|
|
* DNxHD/VC-3 parser
|
|
*/
|
|
|
|
#include "parser.h"
|
|
|
|
#define DNXHD_HEADER_PREFIX 0x0000028001
|
|
|
|
static int dnxhd_find_frame_end(ParseContext *pc,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
uint64_t state = pc->state64;
|
|
int pic_found = pc->frame_start_found;
|
|
int i = 0;
|
|
|
|
if (!pic_found) {
|
|
for (i = 0; i < buf_size; i++) {
|
|
state = (state<<8) | buf[i];
|
|
if ((state & 0xffffffffffLL) == DNXHD_HEADER_PREFIX) {
|
|
i++;
|
|
pic_found = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (pic_found) {
|
|
if (!buf_size) /* EOF considered as end of frame */
|
|
return 0;
|
|
for (; i < buf_size; i++) {
|
|
state = (state<<8) | buf[i];
|
|
if ((state & 0xffffffffffLL) == DNXHD_HEADER_PREFIX) {
|
|
pc->frame_start_found = 0;
|
|
pc->state64 = -1;
|
|
return i-4;
|
|
}
|
|
}
|
|
}
|
|
pc->frame_start_found = pic_found;
|
|
pc->state64 = state;
|
|
return END_NOT_FOUND;
|
|
}
|
|
|
|
static int dnxhd_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 = dnxhd_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_dnxhd_parser = {
|
|
{ CODEC_ID_DNXHD },
|
|
sizeof(ParseContext),
|
|
NULL,
|
|
dnxhd_parse,
|
|
ff_parse_close,
|
|
};
|