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imx_dump_header_bsf.c
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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  if (!*poutbuf)
47  return AVERROR(ENOMEM);
48  poutbufp = *poutbuf;
49  bytestream_put_buffer(&poutbufp, imx_header, 16);
50  bytestream_put_byte(&poutbufp, 0x83); /* KLV BER long form */
51  bytestream_put_be24(&poutbufp, buf_size);
52  bytestream_put_buffer(&poutbufp, buf, buf_size);
53  *poutbuf_size = poutbufp - *poutbuf;
54  return 1;
55 }
56 
58  .name = "imxdump",
59  .filter = imx_dump_header,
60 };