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 "rawenc.h"
27
a64_write_header(AVFormatContext * s)28 static int a64_write_header(AVFormatContext *s)
29 {
30 AVCodecParameters *par = s->streams[0]->codecpar;
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
39 if (par->extradata_size < 4) {
40 av_log(s, AV_LOG_ERROR, "Missing extradata\n");
41 return AVERROR_INVALIDDATA;
42 }
43
44 switch (par->codec_id) {
45 case AV_CODEC_ID_A64_MULTI:
46 header[2] = 0x00;
47 header[3] = AV_RB32(par->extradata+0);
48 header[4] = 2;
49 break;
50 case AV_CODEC_ID_A64_MULTI5:
51 header[2] = 0x01;
52 header[3] = AV_RB32(par->extradata+0);
53 header[4] = 3;
54 break;
55 default:
56 return AVERROR_INVALIDDATA;
57 }
58 avio_write(s->pb, header, 2);
59 return 0;
60 }
61
62 const AVOutputFormat ff_a64_muxer = {
63 .name = "a64",
64 .long_name = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
65 .extensions = "a64, A64",
66 .video_codec = AV_CODEC_ID_A64_MULTI,
67 .write_header = a64_write_header,
68 .write_packet = ff_raw_write_packet,
69 };
70