libavcodec/imx_dump_header_bsf.c

   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 imx_dump_header_bsf.c
  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 != 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 imx_dump_header_bsf = {
  56     "imxdump",
  57     0,
  58     imx_dump_header,
  59 };