FFmpeg
smjpegenc.c
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1 /*
2  * SMJPEG muxer
3  * Copyright (c) 2012 Paul B Mahol
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 /**
23  * @file
24  * This is a muxer for Loki SDL Motion JPEG files
25  */
26 
27 #include "avformat.h"
28 #include "internal.h"
29 #include "smjpeg.h"
30 
31 typedef struct SMJPEGMuxContext {
32  uint32_t duration;
34 
36 {
38  AVIOContext *pb = s->pb;
39  int n, tag;
40 
41  if (s->nb_streams > 2) {
42  av_log(s, AV_LOG_ERROR, "more than >2 streams are not supported\n");
43  return AVERROR(EINVAL);
44  }
45  avio_write(pb, SMJPEG_MAGIC, 8);
46  avio_wb32(pb, 0);
47  avio_wb32(pb, 0);
48 
50  while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
51  avio_wl32(pb, SMJPEG_TXT);
52  avio_wb32(pb, strlen(t->key) + strlen(t->value) + 3);
53  avio_write(pb, t->key, strlen(t->key));
54  avio_write(pb, " = ", 3);
55  avio_write(pb, t->value, strlen(t->value));
56  }
57 
58  for (n = 0; n < s->nb_streams; n++) {
59  AVStream *st = s->streams[n];
60  AVCodecParameters *par = st->codecpar;
61  if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
63  if (!tag) {
64  av_log(s, AV_LOG_ERROR, "unsupported audio codec\n");
65  return AVERROR(EINVAL);
66  }
67  avio_wl32(pb, SMJPEG_SND);
68  avio_wb32(pb, 8);
69  avio_wb16(pb, par->sample_rate);
71  avio_w8(pb, par->channels);
72  avio_wl32(pb, tag);
73  avpriv_set_pts_info(st, 32, 1, 1000);
74  } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
76  if (!tag) {
77  av_log(s, AV_LOG_ERROR, "unsupported video codec\n");
78  return AVERROR(EINVAL);
79  }
80  avio_wl32(pb, SMJPEG_VID);
81  avio_wb32(pb, 12);
82  avio_wb32(pb, 0);
83  avio_wb16(pb, par->width);
84  avio_wb16(pb, par->height);
85  avio_wl32(pb, tag);
86  avpriv_set_pts_info(st, 32, 1, 1000);
87  }
88  }
89 
91  avio_flush(pb);
92 
93  return 0;
94 }
95 
97 {
98  SMJPEGMuxContext *smc = s->priv_data;
99  AVIOContext *pb = s->pb;
100  AVStream *st = s->streams[pkt->stream_index];
101  AVCodecParameters *par = st->codecpar;
102 
103  if (par->codec_type == AVMEDIA_TYPE_AUDIO)
104  avio_wl32(pb, SMJPEG_SNDD);
105  else if (par->codec_type == AVMEDIA_TYPE_VIDEO)
106  avio_wl32(pb, SMJPEG_VIDD);
107  else
108  return 0;
109 
110  avio_wb32(pb, pkt->pts);
111  avio_wb32(pb, pkt->size);
112  avio_write(pb, pkt->data, pkt->size);
113 
114  smc->duration = FFMAX(smc->duration, pkt->pts + pkt->duration);
115  return 0;
116 }
117 
119 {
120  SMJPEGMuxContext *smc = s->priv_data;
121  AVIOContext *pb = s->pb;
122  int64_t currentpos;
123 
124  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
125  currentpos = avio_tell(pb);
126  avio_seek(pb, 12, SEEK_SET);
127  avio_wb32(pb, smc->duration);
128  avio_seek(pb, currentpos, SEEK_SET);
129  }
130 
131  avio_wl32(pb, SMJPEG_DONE);
132 
133  return 0;
134 }
135 
137  .name = "smjpeg",
138  .long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
139  .priv_data_size = sizeof(SMJPEGMuxContext),
140  .audio_codec = AV_CODEC_ID_PCM_S16LE,
141  .video_codec = AV_CODEC_ID_MJPEG,
146  .codec_tag = (const AVCodecTag *const []){ ff_codec_smjpeg_video_tags, ff_codec_smjpeg_audio_tags, 0 },
147 };
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:689
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define SMJPEG_DONE
Definition: smjpeg.h:34
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:4926
static int smjpeg_write_trailer(AVFormatContext *s)
Definition: smjpegenc.c:118
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int size
Definition: avcodec.h:1481
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
#define SMJPEG_HEND
Definition: smjpeg.h:35
static int smjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: smjpegenc.c:96
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:3148
SMJPEG common code.
static AVPacket pkt
const AVCodecTag ff_codec_smjpeg_video_tags[]
Definition: smjpeg.c:31
#define AVFMT_TS_NONSTRICT
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:477
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3960
Format I/O context.
Definition: avformat.h:1358
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:372
int width
Video only.
Definition: avcodec.h:4034
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1498
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
#define SMJPEG_SND
Definition: smjpeg.h:36
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:40
uint8_t * data
Definition: avcodec.h:1480
#define SMJPEG_VIDD
Definition: smjpeg.h:40
uint32_t tag
Definition: movenc.c:1531
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
#define av_log(a,...)
#define SMJPEG_TXT
Definition: smjpeg.h:38
static int smjpeg_write_header(AVFormatContext *s)
Definition: smjpegenc.c:35
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
#define SMJPEG_MAGIC
Definition: smjpeg.h:32
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
int ff_standardize_creation_time(AVFormatContext *s)
Standardize creation_time metadata in AVFormatContext to an ISO-8601 timestamp string.
Definition: utils.c:5710
#define FFMAX(a, b)
Definition: common.h:94
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1414
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
#define AVFMT_GLOBALHEADER
Format wants global header.
Definition: avformat.h:466
const char * name
Definition: avformat.h:505
#define s(width, name)
Definition: cbs_vp9.c:257
int n
Definition: avisynth_c.h:760
Stream structure.
Definition: avformat.h:881
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:196
uint32_t duration
Definition: smjpegenc.c:32
#define SMJPEG_VID
Definition: smjpeg.h:39
void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:238
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:478
#define flags(name, subs,...)
Definition: cbs_av1.c:561
int sample_rate
Audio only.
Definition: avcodec.h:4078
Main libavformat public API header.
#define SMJPEG_SNDD
Definition: smjpeg.h:37
char * key
Definition: dict.h:86
const AVCodecTag ff_codec_smjpeg_audio_tags[]
Definition: smjpeg.c:36
char * value
Definition: dict.h:87
void * priv_data
Format private data.
Definition: avformat.h:1386
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:349
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
int channels
Audio only.
Definition: avcodec.h:4074
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:380
#define AV_DICT_IGNORE_SUFFIX
Return first entry in a dictionary whose first part corresponds to the search key, ignoring the suffix of the found key string.
Definition: dict.h:70
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int stream_index
Definition: avcodec.h:1482
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
AVOutputFormat ff_smjpeg_muxer
Definition: smjpegenc.c:136
This structure stores compressed data.
Definition: avcodec.h:1457
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473