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/libavcodec/imx_dump_header_bsf.c

http://github.com/FFmpeg/FFmpeg
C | 76 lines | 37 code | 13 blank | 26 comment | 4 complexity | 7cef5d4a793bbb9fed88ab580c130571 MD5 | raw file
 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 "bsf.h"
30#include "bytestream.h"
31
32
33static int imx_dump_header(AVBSFContext *ctx, AVPacket *out)
34{
35    /* MXF essence element key */
36    static const uint8_t imx_header[16] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01,0x05,0x01,0x01,0x00 };
37
38    AVPacket *in;
39    int ret = 0;
40    uint8_t *out_buf;
41
42    ret = ff_bsf_get_packet(ctx, &in);
43    if (ret < 0)
44        return ret;
45
46    ret = av_new_packet(out, in->size + 20);
47    if (ret < 0)
48        goto fail;
49
50    out_buf = out->data;
51
52    bytestream_put_buffer(&out_buf, imx_header, 16);
53    bytestream_put_byte(&out_buf, 0x83); /* KLV BER long form */
54    bytestream_put_be24(&out_buf, in->size);
55    bytestream_put_buffer(&out_buf, in->data, in->size);
56
57    ret = av_packet_copy_props(out, in);
58    if (ret < 0)
59        goto fail;
60
61fail:
62    if (ret < 0)
63        av_packet_unref(out);
64    av_packet_free(&in);
65    return ret;
66}
67
68static const enum AVCodecID codec_ids[] = {
69    AV_CODEC_ID_MPEG2VIDEO, AV_CODEC_ID_NONE,
70};
71
72const AVBitStreamFilter ff_imx_dump_header_bsf = {
73    .name      = "imxdump",
74    .filter    = imx_dump_header,
75    .codec_ids = codec_ids,
76};