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a64.c
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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) {
39  header[2] = 0x00;
40  header[3] = AV_RB32(avctx->extradata+0);
41  header[4] = 2;
42  break;
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 
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 };