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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
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  */
22 /**
23  * @file
24  * This is a muxer for Loki SDL Motion JPEG files
25  */
27 #include "avformat.h"
28 #include "internal.h"
29 #include "smjpeg.h"
31 typedef struct SMJPEGMuxContext {
32  uint32_t duration;
36 {
38  AVIOContext *pb = s->pb;
39  int n, tag;
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);
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  }
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  }
92  return 0;
93 }
96 {
97  SMJPEGMuxContext *smc = s->priv_data;
98  AVIOContext *pb = s->pb;
99  AVStream *st = s->streams[pkt->stream_index];
100  AVCodecParameters *par = st->codecpar;
102  if (par->codec_type == AVMEDIA_TYPE_AUDIO)
103  avio_wl32(pb, SMJPEG_SNDD);
104  else if (par->codec_type == AVMEDIA_TYPE_VIDEO)
105  avio_wl32(pb, SMJPEG_VIDD);
106  else
107  return 0;
109  avio_wb32(pb, pkt->pts);
110  avio_wb32(pb, pkt->size);
111  avio_write(pb, pkt->data, pkt->size);
113  smc->duration = FFMAX(smc->duration, pkt->pts + pkt->duration);
114  return 0;
115 }
118 {
119  SMJPEGMuxContext *smc = s->priv_data;
120  AVIOContext *pb = s->pb;
121  int64_t currentpos;
123  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
124  currentpos = avio_tell(pb);
125  avio_seek(pb, 12, SEEK_SET);
126  avio_wb32(pb, smc->duration);
127  avio_seek(pb, currentpos, SEEK_SET);
128  }
130  avio_wl32(pb, SMJPEG_DONE);
132  return 0;
133 }
136  .name = "smjpeg",
137  .long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
138  .priv_data_size = sizeof(SMJPEGMuxContext),
139  .audio_codec = AV_CODEC_ID_PCM_S16LE,
140  .video_codec = AV_CODEC_ID_MJPEG,
145  .codec_tag = (const AVCodecTag *const []){ ff_codec_smjpeg_video_tags, ff_codec_smjpeg_audio_tags, 0 },
146 };
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:701
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
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:4938
static int smjpeg_write_trailer(AVFormatContext *s)
Definition: smjpegenc.c:117
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int size
Definition: packet.h:356
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
Definition: smjpeg.h:35
static int smjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: smjpegenc.c:95
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
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:472
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
Format I/O context.
Definition: avformat.h:1351
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:379
int width
Video only.
Definition: codec_par.h:126
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:373
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
#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: packet.h:355
Definition: smjpeg.h:40
uint32_t tag
Definition: movenc.c:1532
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:225
#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:194
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1591
Definition: smjpeg.h:32
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int ff_standardize_creation_time(AVFormatContext *s)
Standardize creation_time metadata in AVFormatContext to an ISO-8601 timestamp string.
Definition: utils.c:5714
#define FFMAX(a, b)
Definition: common.h:94
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
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:98
Format wants global header.
Definition: avformat.h:461
const char * name
Definition: avformat.h:500
#define s(width, name)
Definition: cbs_vp9.c:257
Stream structure.
Definition: avformat.h:876
Seeking works like for a local file.
Definition: avio.h:40
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:203
uint32_t duration
Definition: smjpegenc.c:32
#define SMJPEG_VID
Definition: smjpeg.h:39
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:465
#define flags(name, subs,...)
Definition: cbs_av1.c:560
int sample_rate
Audio only.
Definition: codec_par.h:170
Main libavformat public API header.
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:1379
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:346
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int channels
Audio only.
Definition: codec_par.h:166
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:387
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:1023
int stream_index
Definition: packet.h:357
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:135
This structure stores compressed data.
Definition: packet.h:332
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348