FFmpeg: libavformat/mpjpeg.c Source File

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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 "ffserver"
27 
28  typedef struct MPJPEGContext {
29   AVClass *class;
30   char *boundary_tag;
31 } MPJPEGContext;
32 
33  static int mpjpeg_write_header(AVFormatContext *s)
34 {
35  MPJPEGContext *mpj = s->priv_data;
36  avio_printf(s->pb, "--%s\r\n", mpj->boundary_tag);
37  avio_flush(s->pb);
38  return 0;
39 }
40 
41  static int mpjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
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 int mpjpeg_write_trailer(AVFormatContext *s)
54 {
55  return 0;
56 }
57 
58  static const AVOption options[] = {
59  { "boundary_tag", "Boundary tag", offsetof(MPJPEGContext, boundary_tag), AV_OPT_TYPE_STRING, {.str = BOUNDARY_TAG}, .flags = AV_OPT_FLAG_ENCODING_PARAM },
60  { NULL },
61 };
62 
63  static const AVClass mpjpeg_muxer_class = {
64  .class_name = "mpjpeg_muxer",
65  .item_name = av_default_item_name,
66  .option = options,
67  .version = LIBAVUTIL_VERSION_INT,
68 };
69 
70  AVOutputFormat ff_mpjpeg_muxer = {
71  .name = "mpjpeg",
72  .long_name = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"),
73  .mime_type = "multipart/x-mixed-replace;boundary=" BOUNDARY_TAG,
74  .extensions = "mjpg",
75  .priv_data_size = sizeof(MPJPEGContext),
76  .audio_codec = AV_CODEC_ID_NONE,
77  .video_codec = AV_CODEC_ID_MJPEG,
78  .write_header = mpjpeg_write_header,
79  .write_packet = mpjpeg_write_packet,
80  .write_trailer = mpjpeg_write_trailer,
81  .flags = AVFMT_NOTIMESTAMPS,
82  .priv_class = &mpjpeg_muxer_class,
83 };
NULL
#define NULL
Definition: coverity.c:32
s
const char * s
Definition: avisynth_c.h:631
AV_CODEC_ID_NONE
Definition: avcodec.h:102
AVOption
AVOption.
Definition: opt.h:245
options
static const AVOption options[]
Definition: mpjpeg.c:58
mpjpeg_write_trailer
static int mpjpeg_write_trailer(AVFormatContext *s)
Definition: mpjpeg.c:53
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
AVPacket::size
int size
Definition: avcodec.h:1468
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AVFormatContext
Format I/O context.
Definition: avformat.h:1314
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:72
opt.h
AVOptions.
AV_OPT_TYPE_STRING
Definition: opt.h:227
AVPacket::data
uint8_t * data
Definition: avcodec.h:1467
ff_mpjpeg_muxer
AVOutputFormat ff_mpjpeg_muxer
Definition: mpjpeg.c:70
AV_CODEC_ID_MJPEG
Definition: avcodec.h:114
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:182
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:275
BOUNDARY_TAG
#define BOUNDARY_TAG
Definition: mpjpeg.c:26
av_default_item_name
av_default_item_name
Definition: libopenh264enc.c:68
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:176
avio_flush
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:202
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
AVOutputFormat::name
const char * name
Definition: avformat.h:523
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:485
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1356
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
mpjpeg_muxer_class
static const AVClass mpjpeg_muxer_class
Definition: mpjpeg.c:63
mpjpeg_write_packet
static int mpjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: mpjpeg.c:41
MPJPEGContext::boundary_tag
char * boundary_tag
Definition: mpjpeg.c:30
flags
static int flags
Definition: cpu.c:47
mpjpeg_write_header
static int mpjpeg_write_header(AVFormatContext *s)
Definition: mpjpeg.c:33
avformat.h
Main libavformat public API header.
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1342
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:497
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1444
write_packet
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: v4l2enc.c:86
avio_printf
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
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