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movsub_bsf.c
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1 /*
2  * Copyright (c) 2008 Reimar Döffinger
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/common.h"
22 #include "libavutil/intreadwrite.h"
23 #include "avcodec.h"
24 
25 
26 static int text2movsub(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
27  uint8_t **poutbuf, int *poutbuf_size,
28  const uint8_t *buf, int buf_size, int keyframe){
29  if (buf_size > 0xffff) return 0;
30  *poutbuf_size = buf_size + 2;
31  *poutbuf = av_malloc(*poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE);
32  if (!*poutbuf)
33  return AVERROR(ENOMEM);
34  AV_WB16(*poutbuf, buf_size);
35  memcpy(*poutbuf + 2, buf, buf_size);
36  return 1;
37 }
38 
40  .name = "text2movsub",
41  .filter = text2movsub,
42 };
43 
44 static int mov2textsub(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
45  uint8_t **poutbuf, int *poutbuf_size,
46  const uint8_t *buf, int buf_size, int keyframe){
47  if (buf_size < 2) return 0;
48  *poutbuf_size = FFMIN(buf_size - 2, AV_RB16(buf));
49  *poutbuf = av_malloc(*poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE);
50  if (!*poutbuf)
51  return AVERROR(ENOMEM);
52  memcpy(*poutbuf, buf + 2, *poutbuf_size);
53  return 1;
54 }
55 
57  .name = "mov2textsub",
58  .filter = mov2textsub,
59 };