FFmpeg
mpjpeg.c
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1 /*
2  * Multipart JPEG format
3  * Copyright (c) 2000, 2001, 2002, 2003 Fabrice Bellard
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 "libavutil/opt.h"
22 #include "avformat.h"
23 
24 /* Multipart JPEG */
25 
26 #define BOUNDARY_TAG "ffmpeg"
27 
28 typedef struct MPJPEGContext {
29  AVClass *class;
30  char *boundary_tag;
32 
34 {
35  MPJPEGContext *mpj = s->priv_data;
36  avio_printf(s->pb, "--%s\r\n", mpj->boundary_tag);
37  return 0;
38 }
39 
41 {
42  MPJPEGContext *mpj = s->priv_data;
43  avio_printf(s->pb, "Content-type: image/jpeg\r\n");
44  avio_printf(s->pb, "Content-length: %d\r\n\r\n",
45  pkt->size);
46  avio_write(s->pb, pkt->data, pkt->size);
47 
48  avio_printf(s->pb, "\r\n--%s\r\n", mpj->boundary_tag);
49  return 0;
50 }
51 
52 static const AVOption options[] = {
53  { "boundary_tag", "Boundary tag", offsetof(MPJPEGContext, boundary_tag), AV_OPT_TYPE_STRING, {.str = BOUNDARY_TAG}, .flags = AV_OPT_FLAG_ENCODING_PARAM },
54  { NULL },
55 };
56 
57 static const AVClass mpjpeg_muxer_class = {
58  .class_name = "mpjpeg_muxer",
59  .item_name = av_default_item_name,
60  .option = options,
61  .version = LIBAVUTIL_VERSION_INT,
62 };
63 
65  .name = "mpjpeg",
66  .long_name = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"),
67  .mime_type = "multipart/x-mixed-replace;boundary=" BOUNDARY_TAG,
68  .extensions = "mjpg",
69  .priv_data_size = sizeof(MPJPEGContext),
70  .audio_codec = AV_CODEC_ID_NONE,
71  .video_codec = AV_CODEC_ID_MJPEG,
75  .priv_class = &mpjpeg_muxer_class,
76 };
mpjpeg_write_packet
static int mpjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpjpeg.c:40
AVOutputFormat::name
const char * name
Definition: avformat.h:496
opt.h
mpjpeg_write_header
static int mpjpeg_write_header(AVFormatContext *s)
Definition: mpjpeg.c:33
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:467
AVPacket::data
uint8_t * data
Definition: packet.h:373
AVOption
AVOption.
Definition: opt.h:247
MPJPEGContext
Definition: mpjpeg.c:28
pkt
AVPacket * pkt
Definition: movenc.c:59
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_OPT_FLAG_ENCODING_PARAM
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:277
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
mpjpeg_muxer_class
static const AVClass mpjpeg_muxer_class
Definition: mpjpeg.c:57
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
ff_mpjpeg_muxer
const AVOutputFormat ff_mpjpeg_muxer
Definition: mpjpeg.c:64
BOUNDARY_TAG
#define BOUNDARY_TAG
Definition: mpjpeg.c:26
AVPacket::size
int size
Definition: packet.h:374
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:117
options
static const AVOption options[]
Definition: mpjpeg.c:52
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:730
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:57
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
AVOutputFormat
Definition: avformat.h:495
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
avformat.h
avio_printf
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
Writes a formatted string to the context.
AVPacket
This structure stores compressed data.
Definition: packet.h:350
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
MPJPEGContext::boundary_tag
char * boundary_tag
Definition: mpjpeg.c:30
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:228
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:347