rawvideo: use VLC_TS_INVALID (refs #3135)

modules/codec/rawvideo.c

@@ -205,7 +205,8 @@ static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
     p_block = *pp_block;
 
 
-    if( !p_block->i_pts && !p_block->i_dts && !date_Get( &p_sys->pts ) )
+    if( p_block->i_pts <= VLC_TS_INVALID && p_block->i_dts <= VLC_TS_INVALID &&
+        !date_Get( &p_sys->pts ) )
     {
         /* We've just started the stream, wait for the first PTS. */
         block_Release( p_block );
@@ -213,11 +214,11 @@ static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
     }
 
     /* Date management: If there is a pts avaliable, use that. */
-    if( p_block->i_pts )
+    if( p_block->i_pts > VLC_TS_INVALID )
     {
         date_Set( &p_sys->pts, p_block->i_pts );
     }
-    else if( p_block->i_dts )
+    else if( p_block->i_dts > VLC_TS_INVALID )
     {
         /* NB, davidf doesn't quite agree with this in general, it is ok
          * for rawvideo since it is in order (ie pts=dts), however, it