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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 + AV_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.  
  39. AVBitStreamFilter ff_text2movsub_bsf={
  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 + AV_INPUT_BUFFER_PADDING_SIZE);
  50.     if (!*poutbuf)
  51.         return AVERROR(ENOMEM);
  52.     memcpy(*poutbuf, buf + 2, *poutbuf_size);
  53.     return 1;
  54. }
  55.  
  56. AVBitStreamFilter ff_mov2textsub_bsf={
  57.     .name   = "mov2textsub",
  58.     .filter = mov2textsub,
  59. };
  60.