a64.c 2.05 KB
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/*
 * a64 muxer
 * Copyright (c) 2009 Tobias Bindhammer
 *
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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
 */

#include "libavcodec/avcodec.h"
#include "libavcodec/a64enc.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
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#include "rawenc.h"
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static int a64_write_header(AVFormatContext *s)
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{
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    AVCodecContext *avctx = s->streams[0]->codec;
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    uint8_t header[5] = {
        0x00, //load
        0x40, //address
        0x00, //mode
        0x00, //charset_lifetime (multi only)
        0x00  //fps in 50/fps;
    };
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    if (avctx->extradata_size < 4) {
        av_log(s, AV_LOG_ERROR, "Missing extradata\n");
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        return AVERROR_INVALIDDATA;
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    }

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    switch (avctx->codec->id) {
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    case AV_CODEC_ID_A64_MULTI:
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        header[2] = 0x00;
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        header[3] = AV_RB32(avctx->extradata+0);
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        header[4] = 2;
        break;
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    case AV_CODEC_ID_A64_MULTI5:
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        header[2] = 0x01;
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        header[3] = AV_RB32(avctx->extradata+0);
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        header[4] = 3;
        break;
    default:
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        return AVERROR_INVALIDDATA;
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    }
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    avio_write(s->pb, header, 2);
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    return 0;
}

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AVOutputFormat ff_a64_muxer = {
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    .name           = "a64",
    .long_name      = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
    .extensions     = "a64, A64",
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    .video_codec    = AV_CODEC_ID_A64_MULTI,
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    .write_header   = a64_write_header,
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    .write_packet   = ff_raw_write_packet,
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};