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 #include "mux.h"
24 
25 /* Multipart JPEG */
26 
27 #define BOUNDARY_TAG "ffmpeg"
28 
29 typedef struct MPJPEGContext {
30  AVClass *class;
31  char *boundary_tag;
33 
35 {
36  MPJPEGContext *mpj = s->priv_data;
37  avio_printf(s->pb, "--%s\r\n", mpj->boundary_tag);
38  return 0;
39 }
40 
42 {
43  MPJPEGContext *mpj = s->priv_data;
44  avio_printf(s->pb, "Content-type: image/jpeg\r\n");
45  avio_printf(s->pb, "Content-length: %d\r\n\r\n",
46  pkt->size);
47  avio_write(s->pb, pkt->data, pkt->size);
48 
49  avio_printf(s->pb, "\r\n--%s\r\n", mpj->boundary_tag);
50  return 0;
51 }
52 
53 static const AVOption options[] = {
54  { "boundary_tag", "Boundary tag", offsetof(MPJPEGContext, boundary_tag), AV_OPT_TYPE_STRING, {.str = BOUNDARY_TAG}, .flags = AV_OPT_FLAG_ENCODING_PARAM },
55  { NULL },
56 };
57 
58 static const AVClass mpjpeg_muxer_class = {
59  .class_name = "mpjpeg_muxer",
60  .item_name = av_default_item_name,
61  .option = options,
62  .version = LIBAVUTIL_VERSION_INT,
63 };
64 
66  .p.name = "mpjpeg",
67  .p.long_name = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"),
68  .p.mime_type = "multipart/x-mixed-replace;boundary=" BOUNDARY_TAG,
69  .p.extensions = "mjpg",
70  .priv_data_size = sizeof(MPJPEGContext),
71  .p.audio_codec = AV_CODEC_ID_NONE,
72  .p.video_codec = AV_CODEC_ID_MJPEG,
73  .write_header = mpjpeg_write_header,
74  .write_packet = mpjpeg_write_packet,
75  .p.flags = AVFMT_NOTIMESTAMPS,
76  .p.priv_class = &mpjpeg_muxer_class,
77 };
mpjpeg_write_packet
static int mpjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpjpeg.c:41
AVOutputFormat::name
const char * name
Definition: avformat.h:511
opt.h
mpjpeg_write_header
static int mpjpeg_write_header(AVFormatContext *s)
Definition: mpjpeg.c:34
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:480
AVPacket::data
uint8_t * data
Definition: packet.h:522
AVOption
AVOption.
Definition: opt.h:294
MPJPEGContext
Definition: mpjpeg.c:29
FFOutputFormat::p
AVOutputFormat p
The public AVOutputFormat.
Definition: mux.h:36
pkt
AVPacket * pkt
Definition: movenc.c:59
s
#define s(width, name)
Definition: cbs_vp9.c:198
AVFormatContext
Format I/O context.
Definition: avformat.h:1363
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:58
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
FFOutputFormat
Definition: mux.h:32
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:251
ff_mpjpeg_muxer
const FFOutputFormat ff_mpjpeg_muxer
Definition: mpjpeg.c:65
BOUNDARY_TAG
#define BOUNDARY_TAG
Definition: mpjpeg.c:27
AVPacket::size
int size
Definition: packet.h:523
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:106
options
static const AVOption options[]
Definition: mpjpeg.c:53
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:248
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:59
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
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:499
MPJPEGContext::boundary_tag
char * boundary_tag
Definition: mpjpeg.c:31
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
mux.h