imx_dump_header_bsf.c 2.09 KB
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/*
 * imx dump header bitstream filter
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 * Copyright (c) 2007 Baptiste Coudurier
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
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 * @file
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 * imx dump header bitstream filter
 * modifies bitstream to fit in mov and be decoded by final cut pro decoder
 */

#include "avcodec.h"
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#include "bsf.h"
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#include "bytestream.h"


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static int imx_dump_header(AVBSFContext *ctx, AVPacket *out)
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{
    /* 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 };
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    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;
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}

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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,
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};