modules/mux/mpjpeg.c

   1 /*****************************************************************************
   2  * mpjpeg.c: mime multipart jpeg  muxer module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002, 2006 VLC authors and VideoLAN
   5  *
   6  * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_sout.h>
  34 #include <vlc_block.h>
  35
  36 /*****************************************************************************
  37  * Module descriptor
  38  *****************************************************************************/
  39 static int  Open   ( vlc_object_t * );
  40 static void Close  ( vlc_object_t * );
  41
  42 #define SOUT_CFG_PREFIX "sout-mpjpeg-"
  43
  44 vlc_module_begin ()
  45     set_shortname( "MPJPEG" )
  46     set_description( N_("Multipart JPEG muxer") )
  47     set_capability( "sout mux", 5 )
  48     set_category( CAT_SOUT )
  49     set_subcategory( SUBCAT_SOUT_MUX )
  50     set_callbacks( Open, Close )
  51     add_shortcut( "mpjpeg" )
  52 vlc_module_end ()
  53
  54 /*****************************************************************************
  55  * Exported prototypes
  56  *****************************************************************************/
  57 static int Control  ( sout_mux_t *, int, va_list );
  58 static int AddStream( sout_mux_t *, sout_input_t * );
  59 static void DelStream( sout_mux_t *, sout_input_t * );
  60 static int Mux      ( sout_mux_t * );
  61
  62 /* This pseudo-random sequence is unlikely to ever happen */
  63 /* This should be the same as in src/network/httpd.c */
  64 #define BOUNDARY "7b3cc56e5f51db803f790dad720ed50a"
  65
  66 /*****************************************************************************
  67  * Open:
  68  *****************************************************************************/
  69 static int Open( vlc_object_t *p_this )
  70 {
  71     sout_mux_t *p_mux = (sout_mux_t*)p_this;
  72
  73     msg_Dbg( p_mux, "Multipart jpeg muxer opened" );
  74
  75     p_mux->pf_control   = Control;
  76     p_mux->pf_addstream = AddStream;
  77     p_mux->pf_delstream = DelStream;
  78     p_mux->pf_mux       = Mux;
  79     p_mux->p_sys        = NULL;
  80
  81     return VLC_SUCCESS;
  82 }
  83
  84 /*****************************************************************************
  85  * Close:
  86  *****************************************************************************/
  87
  88 static void Close( vlc_object_t * p_this )
  89 {
  90     /* TODO: send the ending boundary ("\r\n--"BOUNDARY"--\r\n"),
  91      * but is the access_output still useable?? */
  92     msg_Dbg( p_this, "Multipart jpeg muxer closed" );
  93 }
  94
  95 static int Control( sout_mux_t *p_mux, int i_query, va_list args )
  96 {
  97     VLC_UNUSED(p_mux);
  98     bool *pb_bool;
  99     char **ppsz;
 100
 101     switch( i_query )
 102     {
 103         case MUX_CAN_ADD_STREAM_WHILE_MUXING:
 104             pb_bool = va_arg( args, bool * );
 105             *pb_bool = false;
 106             return VLC_SUCCESS;
 107
 108         case MUX_GET_MIME:
 109             ppsz = va_arg( args, char ** );
 110             *ppsz = strdup( "multipart/x-mixed-replace; boundary="BOUNDARY );
 111             return VLC_SUCCESS;
 112
 113         default:
 114             return VLC_EGENERIC;
 115     }
 116 }
 117
 118 static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
 119 {
 120     if( p_mux->i_nb_inputs > 1 )
 121     {
 122         msg_Dbg( p_mux, "only 1 input allowed" );
 123         return VLC_EGENERIC;
 124     }
 125
 126     msg_Dbg( p_mux, "adding input" );
 127     if( p_input->p_fmt->i_codec != VLC_CODEC_MJPG )
 128         return VLC_EGENERIC;
 129
 130     return VLC_SUCCESS;
 131 }
 132
 133 static void DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
 134 {
 135     VLC_UNUSED(p_input);
 136     msg_Dbg( p_mux, "removing input" );
 137 }
 138
 139 static int Mux( sout_mux_t *p_mux )
 140 {
 141     block_fifo_t *p_fifo;
 142
 143     if( !p_mux->i_nb_inputs ) return VLC_SUCCESS;
 144
 145     p_fifo = p_mux->pp_inputs[0]->p_fifo;
 146
 147     while( block_FifoCount( p_fifo ) > 0 )
 148     {
 149         static const char psz_hfmt[] = "\r\n"
 150             "--"BOUNDARY"\r\n"
 151             "Content-Type: image/jpeg\r\n"
 152             "Content-Length: %zu\r\n"
 153             "\r\n";
 154         block_t *p_data = block_FifoGet( p_fifo );
 155         block_t *p_header = block_Alloc( sizeof( psz_hfmt ) + 20 );
 156
 157         if( p_header == NULL ) /* uho! */
 158         {
 159             block_Release( p_data );
 160             continue;
 161         }
 162
 163         p_header->i_buffer =
 164             snprintf( (char *)p_header->p_buffer, p_header->i_buffer,
 165                       psz_hfmt, p_data->i_buffer );
 166         p_header->i_flags |= BLOCK_FLAG_HEADER;
 167         sout_AccessOutWrite( p_mux->p_access, p_header );
 168         sout_AccessOutWrite( p_mux->p_access, p_data );
 169     }
 170
 171     return VLC_SUCCESS;
 172 }