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  1. /*
  2.  * imx dump header bitstream filter
  3.  * Copyright (c) 2007 Baptiste Coudurier
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * imx dump header bitstream filter
  25.  * modifies bitstream to fit in mov and be decoded by final cut pro decoder
  26.  */
  27.  
  28. #include "avcodec.h"
  29. #include "bytestream.h"
  30.  
  31.  
  32. static int imx_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
  33.                            uint8_t **poutbuf, int *poutbuf_size,
  34.                            const uint8_t *buf, int buf_size, int keyframe)
  35. {
  36.     /* MXF essence element key */
  37.     static const uint8_t imx_header[16] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x05,0x01,0x01,0x00 };
  38.     uint8_t *poutbufp;
  39.  
  40.     if (avctx->codec_id != AV_CODEC_ID_MPEG2VIDEO) {
  41.         av_log(avctx, AV_LOG_ERROR, "imx bitstream filter only applies to mpeg2video codec\n");
  42.         return 0;
  43.     }
  44.  
  45.     *poutbuf = av_malloc(buf_size + 20 + FF_INPUT_BUFFER_PADDING_SIZE);
  46.     poutbufp = *poutbuf;
  47.     bytestream_put_buffer(&poutbufp, imx_header, 16);
  48.     bytestream_put_byte(&poutbufp, 0x83); /* KLV BER long form */
  49.     bytestream_put_be24(&poutbufp, buf_size);
  50.     bytestream_put_buffer(&poutbufp, buf, buf_size);
  51.     *poutbuf_size = poutbufp - *poutbuf;
  52.     return 1;
  53. }
  54.  
  55. AVBitStreamFilter ff_imx_dump_header_bsf = {
  56.     .name   = "imxdump",
  57.     .filter = imx_dump_header,
  58. };
  59.