/*
  * 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 "bsf.h"

 #include "bytestream.h"
 
 

 static int imx_dump_header(AVBSFContext *ctx, AVPacket *out)

 {
     /* 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 };

 
     AVPacket *in;
     int ret = 0;
     uint8_t *out_buf;
 
     ret = ff_bsf_get_packet(ctx, &in);
     if (ret < 0)
         return ret;
 
     ret = av_new_packet(out, in->size + 20);
     if (ret < 0)
         goto fail;
 
     out_buf = out->data;
 
     bytestream_put_buffer(&out_buf, imx_header, 16);
     bytestream_put_byte(&out_buf, 0x83); /* KLV BER long form */
     bytestream_put_be24(&out_buf, in->size);
     bytestream_put_buffer(&out_buf, in->data, in->size);
 
     ret = av_packet_copy_props(out, in);
     if (ret < 0)
         goto fail;
 
 fail:
     if (ret < 0)
         av_packet_unref(out);
     av_packet_free(&in);
     return ret;

 }
 

 static const enum AVCodecID codec_ids[] = {
     AV_CODEC_ID_MPEG2VIDEO, AV_CODEC_ID_NONE,
 };
 
 const AVBitStreamFilter ff_imx_dump_header_bsf = {
     .name      = "imxdump",
     .filter    = imx_dump_header,
     .codec_ids = codec_ids,

 };