/*

 * imx dump header bitstream filter

 * Copyright (c) 2007 Baptiste Coudurier

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * 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.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * 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

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file

 * imx dump header bitstream filter

 * modifies bitstream to fit in mov and be decoded by final cut pro decoder

 */

#include "bsf.h"

#include "bsf_internal.h"

#include "bytestream.h"

static int imx_dump_header(AVBSFContext *ctx, AVPacket *out)

{

    /* 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 };

    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;

}

static const enum AVCodecID codec_ids[] = {

    AV_CODEC_ID_MPEG2VIDEO, AV_CODEC_ID_NONE,

};

const FFBitStreamFilter ff_imx_dump_header_bsf = {

    .p.name      = "imxdump",

    .p.codec_ids = codec_ids,

    .filter      = imx_dump_header,

};