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  * $Id$
   6  *
   7  * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_sout.h>
  35 #include <vlc_block.h>
  36
  37 /*****************************************************************************
  38  * Module descriptor
  39  *****************************************************************************/
  40 static int  Open   ( vlc_object_t * );
  41 static void Close  ( vlc_object_t * );
  42
  43 #define SOUT_CFG_PREFIX "sout-mpjpeg-"
  44
  45 vlc_module_begin ()
  46     set_shortname( "MPJPEG" )
  47     set_description( N_("Multipart JPEG muxer") )
  48     set_capability( "sout mux", 5 )
  49     set_category( CAT_SOUT )
  50     set_subcategory( SUBCAT_SOUT_MUX )
  51     set_callbacks( Open, Close )
  52     add_shortcut( "mpjpeg" )
  53 vlc_module_end ()
  54
  55 /*****************************************************************************
  56  * Exported prototypes
  57  *****************************************************************************/
  58 static int Control  ( sout_mux_t *, int, va_list );
  59 static int AddStream( sout_mux_t *, sout_input_t * );
  60 static void DelStream( sout_mux_t *, sout_input_t * );
  61 static int Mux      ( sout_mux_t * );
  62
  63 /* This pseudo-random sequence is unlikely to ever happen */
  64 /* This should be the same as in src/network/httpd.c */
  65 #define BOUNDARY "7b3cc56e5f51db803f790dad720ed50a"
  66
  67 /*****************************************************************************
  68  * Open:
  69  *****************************************************************************/
  70 static int Open( vlc_object_t *p_this )
  71 {
  72     sout_mux_t *p_mux = (sout_mux_t*)p_this;
  73
  74     msg_Dbg( p_mux, "Multipart jpeg muxer opened" );
  75
  76     p_mux->pf_control   = Control;
  77     p_mux->pf_addstream = AddStream;
  78     p_mux->pf_delstream = DelStream;
  79     p_mux->pf_mux       = Mux;
  80     p_mux->p_sys        = NULL;
  81
  82     return VLC_SUCCESS;
  83 }
  84
  85 /*****************************************************************************
  86  * Close:
  87  *****************************************************************************/
  88
  89 static void Close( vlc_object_t * p_this )
  90 {
  91     /* TODO: send the ending boundary ("\r\n--"BOUNDARY"--\r\n"),
  92      * but is the access_output still useable?? */
  93     msg_Dbg( p_this, "Multipart jpeg muxer closed" );
  94 }
  95
  96 static int Control( sout_mux_t *p_mux, int i_query, va_list args )
  97 {
  98     VLC_UNUSED(p_mux);
  99     bool *pb_bool;
 100     char **ppsz;
 101
 102     switch( i_query )
 103     {
 104         case MUX_CAN_ADD_STREAM_WHILE_MUXING:
 105             pb_bool = va_arg( args, bool * );
 106             *pb_bool = true;
 107             return VLC_SUCCESS;
 108
 109         case MUX_GET_ADD_STREAM_WAIT:
 110             pb_bool = va_arg( args, bool * );
 111             *pb_bool = true;
 112             return VLC_SUCCESS;
 113
 114         case MUX_GET_MIME:
 115             ppsz = va_arg( args, char ** );
 116             *ppsz = strdup( "multipart/x-mixed-replace; boundary="BOUNDARY );
 117             return VLC_SUCCESS;
 118
 119         default:
 120             return VLC_EGENERIC;
 121     }
 122 }
 123
 124 static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
 125 {
 126     if( p_mux->i_nb_inputs > 1 )
 127     {
 128         msg_Dbg( p_mux, "only 1 input allowed" );
 129         return VLC_EGENERIC;
 130     }
 131
 132     msg_Dbg( p_mux, "adding input" );
 133     if( p_input->p_fmt->i_codec != VLC_CODEC_MJPG )
 134         return VLC_EGENERIC;
 135
 136     return VLC_SUCCESS;
 137 }
 138
 139 static void DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
 140 {
 141     VLC_UNUSED(p_input);
 142     msg_Dbg( p_mux, "removing input" );
 143 }
 144
 145 static int Mux( sout_mux_t *p_mux )
 146 {
 147     block_fifo_t *p_fifo;
 148
 149     if( !p_mux->i_nb_inputs ) return VLC_SUCCESS;
 150
 151     p_fifo = p_mux->pp_inputs[0]->p_fifo;
 152
 153     while( block_FifoCount( p_fifo ) > 0 )
 154     {
 155         static const char psz_hfmt[] = "\r\n"
 156             "--"BOUNDARY"\r\n"
 157             "Content-Type: image/jpeg\r\n"
 158             "Content-Length: %zu\r\n"
 159             "\r\n";
 160         block_t *p_data = block_FifoGet( p_fifo );
 161         block_t *p_header = block_Alloc( sizeof( psz_hfmt ) + 20 );
 162
 163         if( p_header == NULL ) /* uho! */
 164         {
 165             block_Release( p_data );
 166             continue;
 167         }
 168
 169         p_header->i_buffer =
 170             snprintf( (char *)p_header->p_buffer, p_header->i_buffer,
 171                       psz_hfmt, p_data->i_buffer );
 172         p_header->i_flags |= BLOCK_FLAG_HEADER;
 173         sout_AccessOutWrite( p_mux->p_access, p_header );
 174         sout_AccessOutWrite( p_mux->p_access, p_data );
 175     }
 176
 177     return VLC_SUCCESS;
 178 }