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2ba45a60 DM |
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(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 | ||
38 | if (avctx->extradata_size < 4) { | |
39 | av_log(s, AV_LOG_ERROR, "Missing extradata\n"); | |
40 | return AVERROR_INVALIDDATA; | |
41 | } | |
42 | ||
43 | switch (avctx->codec_id) { | |
44 | case AV_CODEC_ID_A64_MULTI: | |
45 | header[2] = 0x00; | |
46 | header[3] = AV_RB32(avctx->extradata+0); | |
47 | header[4] = 2; | |
48 | break; | |
49 | case AV_CODEC_ID_A64_MULTI5: | |
50 | header[2] = 0x01; | |
51 | header[3] = AV_RB32(avctx->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 | ||
61 | AVOutputFormat 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 | }; |