mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
|
|
* DVD subtitle decoding
|
|
* Copyright (c) 2005 Fabrice Bellard
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avcodec.h"
|
|
|
|
/* parser definition */
|
|
typedef struct DVDSubParseContext {
|
|
uint8_t *packet;
|
|
int packet_len;
|
|
int packet_index;
|
|
} DVDSubParseContext;
|
|
|
|
static av_cold int dvdsub_parse_init(AVCodecParserContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int dvdsub_parse(AVCodecParserContext *s,
|
|
AVCodecContext *avctx,
|
|
const uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
DVDSubParseContext *pc = s->priv_data;
|
|
|
|
if (pc->packet_index == 0) {
|
|
if (buf_size < 2)
|
|
return 0;
|
|
pc->packet_len = AV_RB16(buf);
|
|
if (pc->packet_len == 0) /* HD-DVD subpicture packet */
|
|
pc->packet_len = AV_RB32(buf+2);
|
|
av_freep(&pc->packet);
|
|
pc->packet = av_malloc(pc->packet_len);
|
|
}
|
|
if (pc->packet) {
|
|
if (pc->packet_index + buf_size <= pc->packet_len) {
|
|
memcpy(pc->packet + pc->packet_index, buf, buf_size);
|
|
pc->packet_index += buf_size;
|
|
if (pc->packet_index >= pc->packet_len) {
|
|
*poutbuf = pc->packet;
|
|
*poutbuf_size = pc->packet_len;
|
|
pc->packet_index = 0;
|
|
return buf_size;
|
|
}
|
|
} else {
|
|
/* erroneous size */
|
|
pc->packet_index = 0;
|
|
}
|
|
}
|
|
*poutbuf = NULL;
|
|
*poutbuf_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold void dvdsub_parse_close(AVCodecParserContext *s)
|
|
{
|
|
DVDSubParseContext *pc = s->priv_data;
|
|
av_freep(&pc->packet);
|
|
}
|
|
|
|
AVCodecParser ff_dvdsub_parser = {
|
|
.codec_ids = { CODEC_ID_DVD_SUBTITLE },
|
|
.priv_data_size = sizeof(DVDSubParseContext),
|
|
.parser_init = dvdsub_parse_init,
|
|
.parser_parse = dvdsub_parse,
|
|
.parser_close = dvdsub_parse_close,
|
|
};
|