modules/mux/mpjpeg.c

   1 /*****************************************************************************
   2  * mpjpeg.c: mime multipart jpeg  muxer module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002 VideoLAN
   5  * $Id: dummy.c 7047 2004-03-11 17:37:50Z fenrir $
   6  *
   7  * Authors: Sigmund Augdal <sigmunau@idi.ntnu.no>
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc/sout.h>
  31
  32 #define SEPARATOR "\r\n--This Random String\r\n" \
  33                   "Content-Type: image/jpeg\r\n\r\n"
  34 /*****************************************************************************
  35  * Module descriptor
  36  *****************************************************************************/
  37 static int  Open   ( vlc_object_t * );
  38 static void Close  ( vlc_object_t * );
  39
  40 vlc_module_begin();
  41     set_description( _("Multipart jpeg muxer") );
  42     set_capability( "sout mux", 5 );
  43     set_callbacks( Open, Close );
  44     add_shortcut( "mpjpeg" );
  45 vlc_module_end();
  46
  47 /*****************************************************************************
  48  * Exported prototypes
  49  *****************************************************************************/
  50 static int Control  ( sout_mux_t *, int, va_list );
  51 static int AddStream( sout_mux_t *, sout_input_t * );
  52 static int DelStream( sout_mux_t *, sout_input_t * );
  53 static int Mux      ( sout_mux_t * );
  54
  55 struct sout_mux_sys_t
  56 {
  57     block_t *p_separator;
  58     vlc_bool_t b_send_headers;
  59 };
  60
  61 /*****************************************************************************
  62  * Open:
  63  *****************************************************************************/
  64 static int Open( vlc_object_t *p_this )
  65 {
  66     sout_mux_t *p_mux = (sout_mux_t*)p_this;
  67     sout_mux_sys_t  *p_sys;
  68
  69     msg_Dbg( p_mux, "Multipart jpeg muxer opened" );
  70
  71     p_mux->pf_control   = Control;
  72     p_mux->pf_addstream = AddStream;
  73     p_mux->pf_delstream = DelStream;
  74     p_mux->pf_mux       = Mux;
  75
  76     p_sys = p_mux->p_sys = malloc( sizeof(sout_mux_sys_t) );
  77     p_sys->b_send_headers = VLC_TRUE;
  78     p_sys->p_separator = block_New( p_mux, sizeof(SEPARATOR) - 1 );
  79     memcpy( p_sys->p_separator->p_buffer, SEPARATOR, sizeof(SEPARATOR) - 1 );
  80
  81     return VLC_SUCCESS;
  82 }
  83
  84 /*****************************************************************************
  85  * Close:
  86  *****************************************************************************/
  87
  88 static void Close( vlc_object_t * p_this )
  89 {
  90     sout_mux_t *p_mux = (sout_mux_t*)p_this;
  91     sout_mux_sys_t *p_sys = p_mux->p_sys;
  92
  93     msg_Dbg( p_mux, "Multipart jpeg muxer closed" );
  94     block_Release( p_sys->p_separator );
  95     free( p_sys );
  96 }
  97
  98 static int Control( sout_mux_t *p_mux, int i_query, va_list args )
  99 {
 100     vlc_bool_t *pb_bool;
 101     char **ppsz;
 102
 103    switch( i_query )
 104    {
 105        case MUX_CAN_ADD_STREAM_WHILE_MUXING:
 106            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
 107            *pb_bool = VLC_TRUE;
 108            return VLC_SUCCESS;
 109
 110        case MUX_GET_ADD_STREAM_WAIT:
 111            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
 112            *pb_bool = VLC_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=This Random String" );
 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_FOURCC('M','J','P','G') )
 135     {
 136         return VLC_EGENERIC;
 137     }
 138
 139     return VLC_SUCCESS;
 140 }
 141
 142 static int DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
 143 {
 144     msg_Dbg( p_mux, "removing input" );
 145     return VLC_SUCCESS;
 146 }
 147
 148 static int Mux( sout_mux_t *p_mux )
 149 {
 150     block_fifo_t *p_fifo;
 151     sout_mux_sys_t *p_sys = p_mux->p_sys;
 152     int i_count;
 153
 154     if( p_sys->b_send_headers )
 155     {
 156         block_t *p_header = block_New( p_mux, sizeof(SEPARATOR) - 3);
 157         memcpy( p_header->p_buffer, &SEPARATOR[2], sizeof(SEPARATOR) - 3 );
 158         p_header->i_flags |= BLOCK_FLAG_HEADER;
 159         sout_AccessOutWrite( p_mux->p_access, p_header );
 160         p_sys->b_send_headers = VLC_FALSE;
 161     }
 162
 163     if( !p_mux->i_nb_inputs ) return VLC_SUCCESS;
 164
 165     p_fifo = p_mux->pp_inputs[0]->p_fifo;
 166     i_count = p_fifo->i_depth;
 167     while( i_count > 0 )
 168     {
 169         block_t *p_data = block_FifoGet( p_fifo );
 170         sout_AccessOutWrite( p_mux->p_access,
 171                              block_Duplicate( p_sys->p_separator ) );
 172         sout_AccessOutWrite( p_mux->p_access, p_data );
 173
 174         i_count--;
 175     }
 176
 177     return VLC_SUCCESS;
 178 }