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libavformat
a64.c
Go to the documentation of this file.
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/*
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* a64 muxer
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* Copyright (c) 2009 Tobias Bindhammer
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "
libavcodec/avcodec.h
"
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#include "
libavcodec/a64enc.h
"
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#include "
libavcodec/bytestream.h
"
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#include "
avformat.h
"
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#include "
rawenc.h
"
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static
int
a64_write_header
(
AVFormatContext
*s)
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{
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AVCodecContext
*avctx = s->
streams
[0]->
codec
;
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uint8_t
header[5] = {
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0x00,
//load
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0x40,
//address
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0x00,
//mode
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0x00,
//charset_lifetime (multi only)
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0x00
//fps in 50/fps;
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};
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if
(avctx->
extradata_size
< 4) {
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av_log
(s,
AV_LOG_ERROR
,
"Missing extradata\n"
);
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return
AVERROR_INVALIDDATA
;
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}
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switch
(avctx->
codec
->
id
) {
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case
AV_CODEC_ID_A64_MULTI
:
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header[2] = 0x00;
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header[3] =
AV_RB32
(avctx->
extradata
+0);
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header[4] = 2;
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break
;
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case
AV_CODEC_ID_A64_MULTI5
:
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header[2] = 0x01;
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header[3] =
AV_RB32
(avctx->
extradata
+0);
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header[4] = 3;
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break
;
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default
:
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return
AVERROR_INVALIDDATA
;
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}
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avio_write
(s->
pb
, header, 2);
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return
0;
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}
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AVOutputFormat
ff_a64_muxer
= {
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.
name
=
"a64"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"a64 - video for Commodore 64"
),
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.extensions =
"a64, A64"
,
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.video_codec =
AV_CODEC_ID_A64_MULTI
,
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.write_header =
a64_write_header
,
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.write_packet =
ff_raw_write_packet
,
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};
AVCodecContext::codec
const struct AVCodec * codec
Definition:
avcodec.h:1059
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition:
error.h:54
ff_a64_muxer
AVOutputFormat ff_a64_muxer
Definition:
a64.c:62
AVFormatContext
Format I/O context.
Definition:
avformat.h:922
uint8_t
uint8_t
Definition:
audio_convert.c:194
AV_RB32
#define AV_RB32
Definition:
intreadwrite.h:130
AV_CODEC_ID_A64_MULTI
Definition:
avcodec.h:254
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition:
avcodec.h:1164
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition:
avformat.h:990
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition:
aviobuf.c:165
a64_write_header
static int a64_write_header(AVFormatContext *s)
Definition:
a64.c:28
AV_CODEC_ID_A64_MULTI5
Definition:
avcodec.h:255
AVCodec::id
enum AVCodecID id
Definition:
avcodec.h:2826
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition:
log.h:123
rawenc.h
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:145
av_log
void av_log(void *avcl, int level, const char *fmt,...)
Definition:
log.c:169
bytestream.h
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition:
avformat.h:718
AVOutputFormat::name
const char * name
Definition:
avformat.h:446
ff_raw_write_packet
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition:
rawenc.c:26
avcodec.h
Libavcodec external API header.
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition:
avformat.h:964
AVCodecContext
main external API structure.
Definition:
avcodec.h:1050
AVCodecContext::extradata_size
int extradata_size
Definition:
avcodec.h:1165
a64enc.h
a64 video encoder - basic headers
avformat.h
Main libavformat public API header.
AVOutputFormat
Definition:
avformat.h:445
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