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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(struct 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.     switch (avctx->codec->id) {
  38.     case AV_CODEC_ID_A64_MULTI:
  39.         header[2] = 0x00;
  40.         header[3] = AV_RB32(avctx->extradata+0);
  41.         header[4] = 2;
  42.         break;
  43.     case AV_CODEC_ID_A64_MULTI5:
  44.         header[2] = 0x01;
  45.         header[3] = AV_RB32(avctx->extradata+0);
  46.         header[4] = 3;
  47.         break;
  48.     default:
  49.         return AVERROR(EINVAL);
  50.     }
  51.     avio_write(s->pb, header, 2);
  52.     return 0;
  53. }
  54.  
  55. AVOutputFormat ff_a64_muxer = {
  56.     .name           = "a64",
  57.     .long_name      = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
  58.     .extensions     = "a64, A64",
  59.     .video_codec    = AV_CODEC_ID_A64_MULTI,
  60.     .write_header   = a64_write_header,
  61.     .write_packet   = ff_raw_write_packet,
  62. };
  63.