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 #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;
  32 } MPJPEGContext;
  33
  34 static int mpjpeg_write_header(AVFormatContext *s)
  35 {
  36     MPJPEGContext *mpj = s->priv_data;
  37     avio_printf(s->pb, "--%s\r\n", mpj->boundary_tag);
  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 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
  65 const FFOutputFormat ff_mpjpeg_muxer = {
  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     .p.subtitle_codec  = AV_CODEC_ID_NONE,
  74     .flags_internal    = FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
  75     .write_header      = mpjpeg_write_header,
  76     .write_packet      = mpjpeg_write_packet,
  77     .p.flags           = AVFMT_NOTIMESTAMPS,
  78     .p.priv_class      = &mpjpeg_muxer_class,
  79 };