ffmpeg/libavformat/mpjpeg.c

   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     uint8_t buf1[256];
  37
  38     snprintf(buf1, sizeof(buf1), "--%s\r\n", mpj->boundary_tag);
  39     avio_write(s->pb, buf1, strlen(buf1));
  40     avio_flush(s->pb);
  41     return 0;
  42 }
  43
  44 static int mpjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
  45 {
  46     MPJPEGContext *mpj = s->priv_data;
  47     uint8_t buf1[256];
  48
  49     snprintf(buf1, sizeof(buf1), "Content-type: image/jpeg\r\n");
  50     avio_write(s->pb, buf1, strlen(buf1));
  51
  52     snprintf(buf1, sizeof(buf1), "Content-length: %d\r\n\r\n", pkt->size);
  53     avio_write(s->pb, buf1, strlen(buf1));
  54     avio_write(s->pb, pkt->data, pkt->size);
  55
  56     snprintf(buf1, sizeof(buf1), "\r\n--%s\r\n", mpj->boundary_tag);
  57     avio_write(s->pb, buf1, strlen(buf1));
  58     return 0;
  59 }
  60
  61 static int mpjpeg_write_trailer(AVFormatContext *s)
  62 {
  63     return 0;
  64 }
  65
  66 static const AVOption options[] = {
  67     { "boundary_tag",    "Boundary tag", offsetof(MPJPEGContext, boundary_tag),   AV_OPT_TYPE_STRING, {.str = BOUNDARY_TAG}, .flags = AV_OPT_FLAG_ENCODING_PARAM },
  68     { NULL },
  69 };
  70
  71 static const AVClass mpjpeg_muxer_class = {
  72     .class_name = "mpjpeg_muxer",
  73     .item_name  = av_default_item_name,
  74     .option     = options,
  75     .version    = LIBAVUTIL_VERSION_INT,
  76 };
  77
  78 AVOutputFormat ff_mpjpeg_muxer = {
  79     .name              = "mpjpeg",
  80     .long_name         = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"),
  81     .mime_type         = "multipart/x-mixed-replace;boundary=" BOUNDARY_TAG,
  82     .extensions        = "mjpg",
  83     .priv_data_size    = sizeof(MPJPEGContext),
  84     .audio_codec       = AV_CODEC_ID_NONE,
  85     .video_codec       = AV_CODEC_ID_MJPEG,
  86     .write_header      = mpjpeg_write_header,
  87     .write_packet      = mpjpeg_write_packet,
  88     .write_trailer     = mpjpeg_write_trailer,
  89     .flags             = AVFMT_NOTIMESTAMPS,
  90     .priv_class        = &mpjpeg_muxer_class,
  91 };