modules/mux/mpjpeg.c

   1 /*****************************************************************************
   2  * mpjpeg.c: mime multipart jpeg  muxer module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002, 2006 the VideoLAN team
   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
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 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 General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, 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     add_obsolete_string( SOUT_CFG_PREFIX "separator" )
  50     set_category( CAT_SOUT )
  51     set_subcategory( SUBCAT_SOUT_MUX )
  52     set_callbacks( Open, Close )
  53     add_shortcut( "mpjpeg" )
  54 vlc_module_end ()
  55
  56 /*****************************************************************************
  57  * Exported prototypes
  58  *****************************************************************************/
  59 static int Control  ( sout_mux_t *, int, va_list );
  60 static int AddStream( sout_mux_t *, sout_input_t * );
  61 static int DelStream( sout_mux_t *, sout_input_t * );
  62 static int Mux      ( sout_mux_t * );
  63
  64 /* This pseudo-random sequence is unlikely to ever happen */
  65 /* This should be the same as in src/network/httpd.c */
  66 #define BOUNDARY "7b3cc56e5f51db803f790dad720ed50a"
  67
  68 /*****************************************************************************
  69  * Open:
  70  *****************************************************************************/
  71 static int Open( vlc_object_t *p_this )
  72 {
  73     sout_mux_t *p_mux = (sout_mux_t*)p_this;
  74
  75     msg_Dbg( p_mux, "Multipart jpeg muxer opened" );
  76
  77     p_mux->pf_control   = Control;
  78     p_mux->pf_addstream = AddStream;
  79     p_mux->pf_delstream = DelStream;
  80     p_mux->pf_mux       = Mux;
  81     p_mux->p_sys        = NULL;
  82
  83     return VLC_SUCCESS;
  84 }
  85
  86 /*****************************************************************************
  87  * Close:
  88  *****************************************************************************/
  89
  90 static void Close( vlc_object_t * p_this )
  91 {
  92     /* TODO: send the ending boundary ("\r\n--"BOUNDARY"--\r\n"),
  93      * but is the access_output still useable?? */
  94     msg_Dbg( p_this, "Multipart jpeg muxer closed" );
  95 }
  96
  97 static int Control( sout_mux_t *p_mux, int i_query, va_list args )
  98 {
  99     VLC_UNUSED(p_mux);
 100     bool *pb_bool;
 101     char **ppsz;
 102
 103     switch( i_query )
 104     {
 105         case MUX_CAN_ADD_STREAM_WHILE_MUXING:
 106             pb_bool = (bool*)va_arg( args, bool * );
 107             *pb_bool = true;
 108             return VLC_SUCCESS;
 109
 110         case MUX_GET_ADD_STREAM_WAIT:
 111             pb_bool = (bool*)va_arg( args, bool * );
 112             *pb_bool = true;
 113             return VLC_SUCCESS;
 114
 115         case MUX_GET_MIME:
 116             ppsz = (char**)va_arg( args, char ** );
 117             *ppsz = strdup( "multipart/x-mixed-replace; boundary="BOUNDARY );
 118             return VLC_SUCCESS;
 119
 120         default:
 121             return VLC_EGENERIC;
 122     }
 123 }
 124
 125 static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
 126 {
 127     if( p_mux->i_nb_inputs > 1 )
 128     {
 129         msg_Dbg( p_mux, "only 1 input allowed" );
 130         return VLC_EGENERIC;
 131     }
 132
 133     msg_Dbg( p_mux, "adding input" );
 134     if( p_input->p_fmt->i_codec != VLC_CODEC_MJPG )
 135         return VLC_EGENERIC;
 136
 137     return VLC_SUCCESS;
 138 }
 139
 140 static int DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
 141 {
 142     VLC_UNUSED(p_input);
 143     msg_Dbg( p_mux, "removing input" );
 144     return VLC_SUCCESS;
 145 }
 146
 147 static int Mux( sout_mux_t *p_mux )
 148 {
 149     block_fifo_t *p_fifo;
 150
 151     if( !p_mux->i_nb_inputs ) return VLC_SUCCESS;
 152
 153     p_fifo = p_mux->pp_inputs[0]->p_fifo;
 154
 155     while( block_FifoCount( p_fifo ) > 0 )
 156     {
 157         static const char psz_hfmt[] = "\r\n"
 158             "--"BOUNDARY"\r\n"
 159             "Content-Type: image/jpeg\r\n"
 160             "Content-Length: %zu\r\n"
 161             "\r\n";
 162         block_t *p_data = block_FifoGet( p_fifo );
 163         block_t *p_header = block_New( p_mux, sizeof( psz_hfmt ) + 20 );
 164
 165         if( p_header == NULL ) /* uho! */
 166         {
 167             block_Release( p_data );
 168             continue;
 169         }
 170
 171         p_header->i_buffer =
 172             snprintf( (char *)p_header->p_buffer, p_header->i_buffer,
 173                       psz_hfmt, p_data->i_buffer );
 174         p_header->i_flags |= BLOCK_FLAG_HEADER;
 175         sout_AccessOutWrite( p_mux->p_access, p_header );
 176         sout_AccessOutWrite( p_mux->p_access, p_data );
 177     }
 178
 179     return VLC_SUCCESS;
 180 }