FFmpeg: libavcodec/imx_dump_header_bsf.c Source File

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

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 };