Libav
a64.c
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1 /*
2  * a64 muxer
3  * Copyright (c) 2009 Tobias Bindhammer
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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/a64enc.h"
24 #include "libavcodec/bytestream.h"
25 #include "avformat.h"
26 #include "rawenc.h"
27 
29 {
30  AVCodecContext *avctx = s->streams[0]->codec;
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 (avctx->extradata_size < 4) {
40  av_log(s, AV_LOG_ERROR, "Missing extradata\n");
41  return AVERROR_INVALIDDATA;
42  }
43 
44  switch (avctx->codec->id) {
46  header[2] = 0x00;
47  header[3] = AV_RB32(avctx->extradata+0);
48  header[4] = 2;
49  break;
51  header[2] = 0x01;
52  header[3] = AV_RB32(avctx->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 
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 };
const struct AVCodec * codec
Definition: avcodec.h:1059
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
AVOutputFormat ff_a64_muxer
Definition: a64.c:62
Format I/O context.
Definition: avformat.h:922
uint8_t
#define AV_RB32
Definition: intreadwrite.h:130
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:165
static int a64_write_header(AVFormatContext *s)
Definition: a64.c:28
enum AVCodecID id
Definition: avcodec.h:2810
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
const char * name
Definition: avformat.h:446
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:26
Libavcodec external API header.
AVIOContext * pb
I/O context.
Definition: avformat.h:964
main external API structure.
Definition: avcodec.h:1050
int extradata_size
Definition: avcodec.h:1165
a64 video encoder - basic headers
Main libavformat public API header.