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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 
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) {
45  header[2] = 0x00;
46  header[3] = AV_RB32(par->extradata+0);
47  header[4] = 2;
48  break;
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 
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 };
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3969
AVOutputFormat ff_a64_muxer
Definition: a64.c:61
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3961
Format I/O context.
Definition: avformat.h:1330
uint8_t
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1398
static const uint8_t header[24]
Definition: sdr2.c:67
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:204
#define av_log(a,...)
static int a64_write_header(AVFormatContext *s)
Definition: a64.c:27
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3987
const char * name
Definition: avformat.h:524
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:1372
Main libavformat public API header.
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3983
AVCodecParameters * codecpar
Definition: avformat.h:1233