1/* 2 * a64 muxer 3 * Copyright (c) 2009 Tobias Bindhammer 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavutil/intreadwrite.h" 23#include "libavcodec/codec_id.h" 24#include "libavcodec/codec_par.h" 25#include "avformat.h" 26#include "rawenc.h" 27 28static int a64_write_header(AVFormatContext *s) 29{ 30 AVCodecParameters *par = s->streams[0]->codecpar; 31 uint8_t header[5] = { 32 0x00, //load 33 0x40, //address 34 0x00, //mode 35 0x00, //charset_lifetime (multi only) 36 0x00 //fps in 50/fps; 37 }; 38 39 if (par->extradata_size < 4) { 40 av_log(s, AV_LOG_ERROR, "Missing extradata\n"); 41 return AVERROR_INVALIDDATA; 42 } 43 44 switch (par->codec_id) { 45 case AV_CODEC_ID_A64_MULTI: 46 header[2] = 0x00; 47 header[3] = AV_RB32(par->extradata+0); 48 header[4] = 2; 49 break; 50 case AV_CODEC_ID_A64_MULTI5: 51 header[2] = 0x01; 52 header[3] = AV_RB32(par->extradata+0); 53 header[4] = 3; 54 break; 55 default: 56 return AVERROR_INVALIDDATA; 57 } 58 avio_write(s->pb, header, 2); 59 return 0; 60} 61 62const AVOutputFormat ff_a64_muxer = { 63 .name = "a64", 64 .long_name = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"), 65 .extensions = "a64, A64", 66 .video_codec = AV_CODEC_ID_A64_MULTI, 67 .write_header = a64_write_header, 68 .write_packet = ff_raw_write_packet, 69}; 70