69 lines
2.0 KiB
C
Executable File
69 lines
2.0 KiB
C
Executable File
/*
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* a64 muxer
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* Copyright (c) 2009 Tobias Bindhammer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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*/
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#include "libavcodec/avcodec.h"
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#include "libavcodec/bytestream.h"
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#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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AVCodecParameters *par = s->streams[0]->codecpar;
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uint8_t header[5] = {
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0x00, //load
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0x40, //address
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0x00, //mode
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0x00, //charset_lifetime (multi only)
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0x00 //fps in 50/fps;
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};
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if (par->extradata_size < 4) {
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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 (par->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(par->extradata+0);
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header[4] = 2;
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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(par->extradata+0);
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header[4] = 3;
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break;
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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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}
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AVOutputFormat ff_a64_muxer = {
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.name = "a64",
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.long_name = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
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.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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};
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