decoder: move decoder_UpdateVideoFormat() into a function

It is going to do a lot more in push with the video context.

include/vlc_codec.h

@@ -267,16 +267,7 @@ struct encoder_t
  *
  * @return 0 if the video output was set up successfully, -1 otherwise.
  */
-VLC_USED
-static inline int decoder_UpdateVideoFormat( decoder_t *dec )
-{
-    vlc_assert( dec->fmt_in.i_cat == VIDEO_ES && dec->cbs != NULL );
-
-    if( dec->fmt_in.i_cat == VIDEO_ES && dec->cbs->video.format_update != NULL )
-        return dec->cbs->video.format_update( dec );
-    else
-        return -1;
-}
+VLC_API int decoder_UpdateVideoFormat( decoder_t *dec );
 
 /**
  * Allocates an output picture buffer.

src/input/decoder_helpers.c

@@ -71,3 +71,12 @@ void decoder_Destroy( decoder_t *p_dec )
         vlc_object_release( p_dec );
     }
 }
+
+int decoder_UpdateVideoFormat( decoder_t *dec )
+{
+    vlc_assert( dec->fmt_in.i_cat == VIDEO_ES && dec->cbs != NULL );
+
+    if( dec->fmt_in.i_cat == VIDEO_ES && dec->cbs->video.format_update != NULL )
+        return dec->cbs->video.format_update( dec );
+    return -1;
+}

src/libvlccore.sym

@@ -78,6 +78,7 @@ decoder_Clean
 decoder_Destroy
 decoder_AbortPictures
 decoder_NewAudioBuffer
+decoder_UpdateVideoFormat
 demux_PacketizerDestroy
 demux_PacketizerNew
 demux_New