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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. };
  84.