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/libavformat/a64.c

http://github.com/FFmpeg/FFmpeg
C | 68 lines | 43 code | 5 blank | 20 comment | 2 complexity | d5ffb59262fb27d0a77a9ccd120daff5 MD5 | raw file
 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
27static int a64_write_header(AVFormatContext *s)
28{
29    AVCodecParameters *par = s->streams[0]->codecpar;
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
38    if (par->extradata_size < 4) {
39        av_log(s, AV_LOG_ERROR, "Missing extradata\n");
40        return AVERROR_INVALIDDATA;
41    }
42
43    switch (par->codec_id) {
44    case AV_CODEC_ID_A64_MULTI:
45        header[2] = 0x00;
46        header[3] = AV_RB32(par->extradata+0);
47        header[4] = 2;
48        break;
49    case AV_CODEC_ID_A64_MULTI5:
50        header[2] = 0x01;
51        header[3] = AV_RB32(par->extradata+0);
52        header[4] = 3;
53        break;
54    default:
55        return AVERROR_INVALIDDATA;
56    }
57    avio_write(s->pb, header, 2);
58    return 0;
59}
60
61AVOutputFormat ff_a64_muxer = {
62    .name           = "a64",
63    .long_name      = NULL_IF_CONFIG_SMALL("a64 - video for Commodore 64"),
64    .extensions     = "a64, A64",
65    .video_codec    = AV_CODEC_ID_A64_MULTI,
66    .write_header   = a64_write_header,
67    .write_packet   = ff_raw_write_packet,
68};