FFmpeg: libavformat/vc1testenc.c Source File

FFmpeg
vc1testenc.c
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1 /*
2  * VC-1 test bitstreams format muxer.
3  * Copyright (c) 2008 Konstantin Shishkov
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 #include "avformat.h"
22 #include "internal.h"
23 
24  typedef struct RCVContext {
25   int frames;
26 } RCVContext;
27 
28  static int vc1test_write_header(AVFormatContext *s)
29 {
30  AVCodecParameters *par = s->streams[0]->codecpar;
31  AVIOContext *pb = s->pb;
32 
33  if (par->codec_id != AV_CODEC_ID_WMV3) {
34  av_log(s, AV_LOG_ERROR, "Only WMV3 is accepted!\n");
35  return -1;
36  }
37  avio_wl24(pb, 0); //frames count will be here
38  avio_w8(pb, 0xC5);
39  avio_wl32(pb, 4);
40  avio_write(pb, par->extradata, 4);
41  avio_wl32(pb, par->height);
42  avio_wl32(pb, par->width);
43  avio_wl32(pb, 0xC);
44  avio_wl24(pb, 0); // hrd_buffer
45  avio_w8(pb, 0x80); // level|cbr|res1
46  avio_wl32(pb, 0); // hrd_rate
47  if (s->streams[0]->avg_frame_rate.den && s->streams[0]->avg_frame_rate.num == 1)
48  avio_wl32(pb, s->streams[0]->avg_frame_rate.den);
49  else
50  avio_wl32(pb, 0xFFFFFFFF); //variable framerate
51  avpriv_set_pts_info(s->streams[0], 32, 1, 1000);
52 
53  return 0;
54 }
55 
56  static int vc1test_write_packet(AVFormatContext *s, AVPacket *pkt)
57 {
58  RCVContext *ctx = s->priv_data;
59  AVIOContext *pb = s->pb;
60 
61  if (!pkt->size)
62  return 0;
63  avio_wl32(pb, pkt->size | ((pkt->flags & AV_PKT_FLAG_KEY) ? 0x80000000 : 0));
64  avio_wl32(pb, pkt->pts);
65  avio_write(pb, pkt->data, pkt->size);
66  ctx->frames++;
67 
68  return 0;
69 }
70 
71  static int vc1test_write_trailer(AVFormatContext *s)
72 {
73  RCVContext *ctx = s->priv_data;
74  AVIOContext *pb = s->pb;
75 
76  if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
77  avio_seek(pb, 0, SEEK_SET);
78  avio_wl24(pb, ctx->frames);
79  avio_flush(pb);
80  }
81  return 0;
82 }
83 
84  AVOutputFormat ff_vc1t_muxer = {
85  .name = "vc1test",
86  .long_name = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"),
87  .extensions = "rcv",
88  .priv_data_size = sizeof(RCVContext),
89  .audio_codec = AV_CODEC_ID_NONE,
90  .video_codec = AV_CODEC_ID_WMV3,
91  .write_header = vc1test_write_header,
92  .write_packet = vc1test_write_packet,
93  .write_trailer = vc1test_write_trailer,
94 };
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:679
s
const char * s
Definition: avisynth_c.h:768
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AV_CODEC_ID_NONE
Definition: avcodec.h:216
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4820
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVPacket::size
int size
Definition: avcodec.h:1431
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3876
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
avio_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:369
AVCodecParameters::width
int width
Video only.
Definition: avcodec.h:3950
ff_vc1t_muxer
AVOutputFormat ff_vc1t_muxer
Definition: vc1testenc.c:84
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
AVPacket::data
uint8_t * data
Definition: avcodec.h:1430
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1462
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
vc1test_write_packet
static int vc1test_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vc1testenc.c:56
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:186
vc1test_write_header
static int vc1test_write_header(AVFormatContext *s)
Definition: vc1testenc.c:28
AVStream::avg_frame_rate
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:946
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1436
vc1test_write_trailer
static int vc1test_write_trailer(AVFormatContext *s)
Definition: vc1testenc.c:71
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
avio_flush
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:238
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
AVOutputFormat::name
const char * name
Definition: avformat.h:507
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
RCVContext::frames
int frames
Definition: vc1testenc.c:25
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:196
avio_wl24
void avio_wl24(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:481
avformat.h
Main libavformat public API header.
AV_CODEC_ID_WMV3
Definition: avcodec.h:289
AVRational::den
int den
Denominator.
Definition: rational.h:60
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1370
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:337
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3898
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1407
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1423
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