libavformat/a64.c

   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 "mux.h"
  27 #include "rawenc.h"
  28
  29 static int a64_write_header(AVFormatContext *s)
  30 {
  31     AVCodecParameters *par = s->streams[0]->codecpar;
  32     uint8_t header[5] = {
  33         0x00, //load
  34         0x40, //address
  35         0x00, //mode
  36         0x00, //charset_lifetime (multi only)
  37         0x00  //fps in 50/fps;
  38     };
  39
  40     if (par->extradata_size < 4) {
  41         av_log(s, AV_LOG_ERROR, "Missing extradata\n");
  42         return AVERROR_INVALIDDATA;
  43     }
  44
  45     switch (par->codec_id) {
  46     case AV_CODEC_ID_A64_MULTI:
  47         header[2] = 0x00;
  48         header[3] = AV_RB32(par->extradata+0);
  49         header[4] = 2;
  50         break;
  51     case AV_CODEC_ID_A64_MULTI5:
  52         header[2] = 0x01;
  53         header[3] = AV_RB32(par->extradata+0);
  54         header[4] = 3;
  55         break;
  56     default:
  57         return AVERROR_INVALIDDATA;
  58     }
  59     avio_write(s->pb, header, 2);
  60     return 0;
  61 }
  62
  63 const FFOutputFormat ff_a64_muxer = {
  64     .p.name         = "a64",
  65     .p.long_name    = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
  66     .p.extensions   = "a64, A64",
  67     .p.video_codec  = AV_CODEC_ID_A64_MULTI,
  68     .p.audio_codec    = AV_CODEC_ID_NONE,
  69     .p.subtitle_codec = AV_CODEC_ID_NONE,
  70     .flags_internal   = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
  71     .write_header   = a64_write_header,
  72     .write_packet   = ff_raw_write_packet,
  73 };