/*
  * imx dump header bitstream filter

  * Copyright (c) 2007 Baptiste Coudurier

  *
  * 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
  */
 
 /**

  * @file

  * imx dump header bitstream filter
  * modifies bitstream to fit in mov and be decoded by final cut pro decoder
  */
 
 #include "avcodec.h"
 #include "bytestream.h"
 
 
 static int imx_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
                            uint8_t **poutbuf, int *poutbuf_size,
                            const uint8_t *buf, int buf_size, int keyframe)
 {
     /* MXF essence element key */
     static const uint8_t imx_header[16] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x05,0x01,0x01,0x00 };
     uint8_t *poutbufp;
 

     if (avctx->codec_id != AV_CODEC_ID_MPEG2VIDEO) {

         av_log(avctx, AV_LOG_ERROR, "imx bitstream filter only applies to mpeg2video codec\n");
         return 0;
     }
 
     *poutbuf = av_malloc(buf_size + 20 + FF_INPUT_BUFFER_PADDING_SIZE);
     poutbufp = *poutbuf;
     bytestream_put_buffer(&poutbufp, imx_header, 16);
     bytestream_put_byte(&poutbufp, 0x83); /* KLV BER long form */
     bytestream_put_be24(&poutbufp, buf_size);
     bytestream_put_buffer(&poutbufp, buf, buf_size);
     *poutbuf_size = poutbufp - *poutbuf;
     return 1;
 }
 

 AVBitStreamFilter ff_imx_dump_header_bsf = {

     "imxdump",
     0,
     imx_dump_header,
 };