FFmpeg
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/codec_id.h"
23 #include "libavcodec/codec_par.h"
24 #include "libavcodec/bytestream.h"
25 #include "avformat.h"
26 #include "rawenc.h"
27 
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) {
46  header[2] = 0x00;
47  header[3] = AV_RB32(par->extradata+0);
48  header[4] = 2;
49  break;
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 
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 };
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
AVOutputFormat::name
const char * name
Definition: avformat.h:496
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
ff_a64_muxer
const AVOutputFormat ff_a64_muxer
Definition: a64.c:62
AV_CODEC_ID_A64_MULTI
@ AV_CODEC_ID_A64_MULTI
Definition: codec_id.h:193
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
codec_id.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
ff_raw_write_packet
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:29
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
a64_write_header
static int a64_write_header(AVFormatContext *s)
Definition: a64.c:28
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:116
AV_RB32
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:96
header
static const uint8_t header[24]
Definition: sdr2.c:67
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:215
rawenc.h
AVOutputFormat
Definition: avformat.h:495
AV_CODEC_ID_A64_MULTI5
@ AV_CODEC_ID_A64_MULTI5
Definition: codec_id.h:194
avformat.h
codec_par.h
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
bytestream.h
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61