modules/stream_out/autodel.c

   1 /*****************************************************************************
   2  * autodel.c: monitor mux inputs and automatically add/delete streams
   3  *****************************************************************************
   4  * Copyright (C) 2006 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   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-autodel-"
  44
  45 vlc_module_begin ()
  46     set_shortname( N_("Autodel"))
  47     set_description( N_("Automatically add/delete input streams"))
  48     set_capability( "sout stream", 50 )
  49     add_shortcut( "autodel" )
  50     set_callbacks( Open, Close )
  51 vlc_module_end ()
  52
  53
  54 /*****************************************************************************
  55  * Local prototypes
  56  *****************************************************************************/
  57 static sout_stream_id_sys_t *Add( sout_stream_t *, const es_format_t * );
  58 static void              Del   ( sout_stream_t *, sout_stream_id_sys_t * );
  59 static int               Send  ( sout_stream_t *, sout_stream_id_sys_t *, block_t * );
  60
  61 struct sout_stream_id_sys_t
  62 {
  63     sout_stream_id_sys_t *id;
  64     es_format_t fmt;
  65     mtime_t i_last;
  66     bool b_error;
  67 };
  68
  69 struct sout_stream_sys_t
  70 {
  71     sout_stream_id_sys_t **pp_es;
  72     int i_es_num;
  73 };
  74
  75 /*****************************************************************************
  76  * Open:
  77  *****************************************************************************/
  78 static int Open( vlc_object_t *p_this )
  79 {
  80     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
  81     sout_stream_sys_t *p_sys;
  82
  83     p_sys          = malloc( sizeof( sout_stream_sys_t ) );
  84
  85     if( !p_stream->p_next )
  86     {
  87         msg_Err( p_stream, "cannot create chain" );
  88         free( p_sys );
  89         return VLC_EGENERIC;
  90     }
  91     p_sys->pp_es = NULL;
  92     p_sys->i_es_num = 0;
  93
  94     p_stream->pf_add    = Add;
  95     p_stream->pf_del    = Del;
  96     p_stream->pf_send   = Send;
  97
  98     p_stream->p_sys     = p_sys;
  99
 100     return VLC_SUCCESS;
 101 }
 102
 103 /*****************************************************************************
 104  * Close:
 105  *****************************************************************************/
 106 static void Close( vlc_object_t * p_this )
 107 {
 108     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 109     sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
 110
 111     free( p_sys );
 112 }
 113
 114 static sout_stream_id_sys_t * Add( sout_stream_t *p_stream,
 115                                    const es_format_t *p_fmt )
 116 {
 117     sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
 118     sout_stream_id_sys_t *p_es = malloc( sizeof(sout_stream_id_sys_t) );
 119     if( unlikely(p_es == NULL) )
 120         return NULL;
 121
 122     es_format_Copy( &p_es->fmt, p_fmt );
 123
 124     p_es->id = NULL;
 125     p_es->i_last = VLC_TS_INVALID;
 126     p_es->b_error = false;
 127     TAB_APPEND( p_sys->i_es_num, p_sys->pp_es, p_es );
 128
 129     return p_es;
 130 }
 131
 132 static void Del( sout_stream_t *p_stream, sout_stream_id_sys_t *p_es )
 133 {
 134     sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
 135
 136     if( p_es->id != NULL )
 137         sout_StreamIdDel( p_stream->p_next, p_es->id );
 138
 139     TAB_REMOVE( p_sys->i_es_num, p_sys->pp_es, p_es );
 140     es_format_Clean( &p_es->fmt );
 141     free( p_es );
 142 }
 143
 144 static int Send( sout_stream_t *p_stream, sout_stream_id_sys_t *p_es,
 145                  block_t *p_buffer )
 146 {
 147     sout_stream_sys_t *p_sys = (sout_stream_sys_t *)p_stream->p_sys;
 148     mtime_t i_current = mdate();
 149     int i;
 150
 151     p_es->i_last = p_buffer->i_dts;
 152     if ( !p_es->id && !p_es->b_error )
 153     {
 154         p_es->id = p_stream->p_next->pf_add( p_stream->p_next, &p_es->fmt );
 155         if ( p_es->id == NULL )
 156         {
 157             p_es->b_error = true;
 158             msg_Err( p_stream, "couldn't create chain for id %d",
 159                      p_es->fmt.i_id );
 160         }
 161     }
 162
 163     if ( !p_es->b_error )
 164         p_stream->p_next->pf_send( p_stream->p_next, p_es->id, p_buffer );
 165     else
 166         block_ChainRelease( p_buffer );
 167
 168     for ( i = 0; i < p_sys->i_es_num; i++ )
 169     {
 170         if ( p_sys->pp_es[i]->id != NULL
 171               && (p_sys->pp_es[i]->fmt.i_cat == VIDEO_ES
 172                    || p_sys->pp_es[i]->fmt.i_cat == AUDIO_ES)
 173               && p_sys->pp_es[i]->i_last < i_current )
 174         {
 175             p_stream->p_next->pf_del( p_stream->p_next, p_sys->pp_es[i]->id );
 176             p_sys->pp_es[i]->id = NULL;
 177         }
 178     }
 179
 180     return VLC_SUCCESS;
 181 }