mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
2.5 KiB
85 lines
2.5 KiB
/* |
|
* DVD subtitle decoding for ffmpeg |
|
* Copyright (c) 2005 Fabrice Bellard. |
|
* |
|
* 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 "libavutil/intreadwrite.h" |
|
#include "avcodec.h" |
|
|
|
/* parser definition */ |
|
typedef struct DVDSubParseContext { |
|
uint8_t *packet; |
|
int packet_len; |
|
int packet_index; |
|
} DVDSubParseContext; |
|
|
|
static 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 void dvdsub_parse_close(AVCodecParserContext *s) |
|
{ |
|
DVDSubParseContext *pc = s->priv_data; |
|
av_freep(&pc->packet); |
|
} |
|
|
|
AVCodecParser dvdsub_parser = { |
|
{ CODEC_ID_DVD_SUBTITLE }, |
|
sizeof(DVDSubParseContext), |
|
dvdsub_parse_init, |
|
dvdsub_parse, |
|
dvdsub_parse_close, |
|
};
|
|
|