Only reference the input when we have at least one codec - fixes #1287.

Some stream output guru should really review this.

modules/stream_out/display.c

@@ -76,6 +76,7 @@ static int               Send( sout_stream_t *, sout_stream_id_t *, block_t* );
 struct sout_stream_sys_t
 {
     input_thread_t *p_input;
+    unsigned        i_es;
 
     vlc_bool_t     b_audio;
     vlc_bool_t     b_video;
@@ -96,14 +97,8 @@ static int Open( vlc_object_t *p_this )
                    p_stream->p_cfg );
 
     p_sys          = malloc( sizeof( sout_stream_sys_t ) );
-    p_sys->p_input = vlc_object_find( p_stream, VLC_OBJECT_INPUT,
-                                      FIND_PARENT );
-    if( !p_sys->p_input )
-    {
-        msg_Err( p_stream, "cannot find p_input" );
-        free( p_sys );
-        return VLC_EGENERIC;
-    }
+    p_sys->p_input = NULL;
+    p_sys->i_es    = 0;
 
     var_Get( p_stream, SOUT_CFG_PREFIX "audio", &val );
     p_sys->b_audio = val.b_bool;
@@ -137,7 +132,6 @@ static void Close( vlc_object_t * p_this )
     /* update p_sout->i_out_pace_nocontrol */
     p_stream->p_sout->i_out_pace_nocontrol--;
 
-    vlc_object_release( p_sys->p_input );
     free( p_sys );
 }
 
@@ -158,6 +152,20 @@ static sout_stream_id_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
     }
 
     id = malloc( sizeof( sout_stream_id_t ) );
+    if( id == NULL )
+        return NULL;
+
+    if( p_sys->i_es == 0 )
+    {
+        p_sys->p_input = vlc_object_find( p_stream, VLC_OBJECT_INPUT,
+                                          FIND_PARENT );
+        if( p_sys->p_input == NULL )
+        {
+            msg_Err( p_stream, "cannot find input" );
+            free( id );
+            return NULL;
+        }
+    }
 
     id->p_dec = input_DecoderNew( p_sys->p_input, p_fmt, VLC_TRUE );
     if( id->p_dec == NULL )
@@ -165,15 +173,21 @@ static sout_stream_id_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
         msg_Err( p_stream, "cannot create decoder for fcc=`%4.4s'",
                  (char*)&p_fmt->i_codec );
         free( id );
+        if( p_sys->i_es == 0 )
+            vlc_object_release( p_sys->p_input );
         return NULL;
     }
 
+    p_sys->i_es++;
     return id;
 }
 
 static int Del( sout_stream_t *p_stream, sout_stream_id_t *id )
 {
     input_DecoderDelete( id->p_dec );
+    if( --p_stream->p_sys->i_es == 0)
+        vlc_object_release( p_stream->p_sys->p_input );
+
     free( id );
     return VLC_SUCCESS;
 }