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  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 "libavcodec/avcodec.h"
  23. #include "libavcodec/bytestream.h"
  24. #include "avformat.h"
  25. #include "rawenc.h"
  26.  
  27. static int a64_write_header(AVFormatContext *s)
  28. {
  29.     AVCodecContext *avctx = s->streams[0]->codec;
  30.     uint8_t header[5] = {
  31.         0x00, //load
  32.         0x40, //address
  33.         0x00, //mode
  34.         0x00, //charset_lifetime (multi only)
  35.         0x00  //fps in 50/fps;
  36.     };
  37.  
  38.     if (avctx->extradata_size < 4) {
  39.         av_log(s, AV_LOG_ERROR, "Missing extradata\n");
  40.         return AVERROR_INVALIDDATA;
  41.     }
  42.  
  43.     switch (avctx->codec_id) {
  44.     case AV_CODEC_ID_A64_MULTI:
  45.         header[2] = 0x00;
  46.         header[3] = AV_RB32(avctx->extradata+0);
  47.         header[4] = 2;
  48.         break;
  49.     case AV_CODEC_ID_A64_MULTI5:
  50.         header[2] = 0x01;
  51.         header[3] = AV_RB32(avctx->extradata+0);
  52.         header[4] = 3;
  53.         break;
  54.     default:
  55.         return AVERROR_INVALIDDATA;
  56.     }
  57.     avio_write(s->pb, header, 2);
  58.     return 0;
  59. }
  60.  
  61. AVOutputFormat ff_a64_muxer = {
  62.     .name           = "a64",
  63.     .long_name      = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
  64.     .extensions     = "a64, A64",
  65.     .video_codec    = AV_CODEC_ID_A64_MULTI,
  66.     .write_header   = a64_write_header,
  67.     .write_packet   = ff_raw_write_packet,
  68. };
  69.