/*

 * Copyright (c) 2008 Reimar Döffinger

 *

 * 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

 */

#include "libavutil/common.h"

#include "libavutil/intreadwrite.h"

#include "bsf.h"

#include "bsf_internal.h"

static int text2movsub(AVBSFContext *ctx, AVPacket *out)

{

    AVPacket *in;

    int ret = 0;

    ret = ff_bsf_get_packet(ctx, &in);

    if (ret < 0)

        return ret;

    if (in->size > 0xffff) {

        ret = AVERROR_INVALIDDATA;

        goto fail;

    }

    ret = av_new_packet(out, in->size + 2);

    if (ret < 0) {

        ret = AVERROR(ENOMEM);

        goto fail;

    }

    ret = av_packet_copy_props(out, in);

    if (ret < 0)

        goto fail;

    AV_WB16(out->data, in->size);

    memcpy(out->data + 2, in->data, in->size);

fail:

    if (ret < 0)

        av_packet_unref(out);

    av_packet_free(&in);

    return ret;

}

const FFBitStreamFilter ff_text2movsub_bsf = {

    .p.name = "text2movsub",

    .filter = text2movsub,

};

static int mov2textsub(AVBSFContext *ctx, AVPacket *pkt)

{

    int ret = 0;

    ret = ff_bsf_get_packet_ref(ctx, pkt);

    if (ret < 0)

        return ret;

    if (pkt->size < 2) {

       av_packet_unref(pkt);

       return AVERROR_INVALIDDATA;

    }

    pkt->size  = FFMIN(pkt->size - 2, AV_RB16(pkt->data));

    pkt->data += 2;

    return 0;

}

const FFBitStreamFilter ff_mov2textsub_bsf = {

    .p.name = "mov2textsub",

    .filter = mov2textsub,

};