libavformat/a64.c

   1 /*
   2  * a64 muxer
   3  * Copyright (c) 2009 Tobias Bindhammer
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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/a64enc.h"
  24 #include "libavcodec/bytestream.h"
  25 #include "avformat.h"
  26 #include "rawenc.h"
  27
  28 static int a64_write_header(struct AVFormatContext *s)
  29 {
  30     AVCodecContext *avctx = s->streams[0]->codec;
  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     switch (avctx->codec->id) {
  39     case AV_CODEC_ID_A64_MULTI:
  40         header[2] = 0x00;
  41         header[3] = AV_RB32(avctx->extradata+0);
  42         header[4] = 2;
  43         break;
  44     case AV_CODEC_ID_A64_MULTI5:
  45         header[2] = 0x01;
  46         header[3] = AV_RB32(avctx->extradata+0);
  47         header[4] = 3;
  48         break;
  49     default:
  50         return AVERROR(EINVAL);
  51     }
  52     avio_write(s->pb, header, 2);
  53     return 0;
  54 }
  55
  56 AVOutputFormat ff_a64_muxer = {
  57     .name           = "a64",
  58     .long_name      = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
  59     .extensions     = "a64, A64",
  60     .video_codec    = AV_CODEC_ID_A64_MULTI,
  61     .write_header   = a64_write_header,
  62     .write_packet   = ff_raw_write_packet,
  63 };