libavcodec/movsub_bsf.c

   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/intreadwrite.h"
  22 #include "avcodec.h"
  23
  24
  25 static int text2movsub(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
  26                      uint8_t **poutbuf, int *poutbuf_size,
  27                      const uint8_t *buf, int buf_size, int keyframe){
  28     if (buf_size > 0xffff) return 0;
  29     *poutbuf_size = buf_size + 2;
  30     *poutbuf = av_malloc(*poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE);
  31     AV_WB16(*poutbuf, buf_size);
  32     memcpy(*poutbuf + 2, buf, buf_size);
  33     return 1;
  34 }
  35
  36 AVBitStreamFilter text2movsub_bsf={
  37     "text2movsub",
  38     0,
  39     text2movsub,
  40 };
  41
  42 static int mov2textsub(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
  43                      uint8_t **poutbuf, int *poutbuf_size,
  44                      const uint8_t *buf, int buf_size, int keyframe){
  45     if (buf_size < 2) return 0;
  46     *poutbuf_size = FFMIN(buf_size - 2, AV_RB16(buf));
  47     *poutbuf = av_malloc(*poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE);
  48     memcpy(*poutbuf, buf + 2, *poutbuf_size);
  49     return 1;
  50 }
  51
  52 AVBitStreamFilter mov2textsub_bsf={
  53     "mov2textsub",
  54     0,
  55     mov2textsub,
  56 };