filter: simplify filter owner usage

Also remove unchecked memory allocation.

src/audio_output/aout_internal.h

@@ -42,12 +42,6 @@ typedef struct
     void *p_private;
 } aout_request_vout_t;
 
-struct filter_owner_sys_t
-{
-    audio_output_t *p_aout;
-    aout_input_t    *p_input;
-};
-
 typedef struct aout_volume aout_volume_t;
 
 /** an input stream for the audio output */

src/audio_output/filters.c

@@ -59,7 +59,6 @@ static filter_t * FindFilter( vlc_object_t *obj,
     p_filter->fmt_in.i_codec = infmt->i_format;
     p_filter->fmt_out.audio = *outfmt;
     p_filter->fmt_out.i_codec = outfmt->i_format;
-    p_filter->p_owner = NULL;
 
     if( infmt->i_format == outfmt->i_format
      && infmt->i_physical_channels == outfmt->i_physical_channels
@@ -202,7 +201,6 @@ void aout_FiltersDestroyPipeline( filter_t *const *filters, unsigned n )
         filter_t *p_filter = filters[i];
 
         module_unneed( p_filter, p_filter->p_module );
-        free( p_filter->p_owner );
         vlc_object_release( p_filter );
     }
 }

src/audio_output/input.c

@@ -147,10 +147,7 @@ aout_input_t *aout_InputNew (audio_output_t * p_aout,
                 psz_parser = psz_next;
                 continue;
             }
-
-            p_filter->p_owner = malloc( sizeof(*p_filter->p_owner) );
-            p_filter->p_owner->p_aout  = p_aout;
-            p_filter->p_owner->p_input = p_input;
+            p_filter->p_owner = (filter_owner_sys_t *)p_input;
 
             /* request format */
             memcpy( &p_filter->fmt_in.audio, &chain_output_format,
@@ -205,7 +202,6 @@ aout_input_t *aout_InputNew (audio_output_t * p_aout,
                 msg_Err( p_aout, "cannot add user filter %s (skipped)",
                          psz_parser );
 
-                free( p_filter->p_owner );
                 vlc_object_release( p_filter );
 
                 psz_parser = psz_next;
@@ -222,7 +218,6 @@ aout_input_t *aout_InputNew (audio_output_t * p_aout,
                          psz_parser );
 
                 module_unneed( p_filter, p_filter->p_module );
-                free( p_filter->p_owner );
                 vlc_object_release( p_filter );
 
                 psz_parser = psz_next;
@@ -553,7 +548,7 @@ static vout_thread_t *RequestVout( void *p_private,
 vout_thread_t *aout_filter_RequestVout( filter_t *p_filter,
                                         vout_thread_t *p_vout, video_format_t *p_fmt )
 {
-    aout_input_t *p_input = p_filter->p_owner->p_input;
+    aout_input_t *p_input = (aout_input_t *)p_filter->p_owner;
     aout_request_vout_t *p_request = &p_input->request_vout;
 
     /* XXX: this only works from audio input */