a52: use VLC_TS_INVALID (refs #3135)

modules/codec/a52.c

@@ -137,6 +137,7 @@ static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
     p_sys->b_packetizer = b_packetizer;
     p_sys->i_state = STATE_NOSYNC;
     date_Set( &p_sys->end_date, 0 );
+    p_sys->i_pts = VLC_TS_INVALID;
 
     p_sys->bytestream = block_BytestreamInit();
 
@@ -192,7 +193,7 @@ static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
         return NULL;
     }
 
-    if( !date_Get( &p_sys->end_date ) && !(*pp_block)->i_pts )
+    if( !date_Get( &p_sys->end_date ) && (*pp_block)->i_pts <= VLC_TS_INVALID)
     {
         /* We've just started the stream, wait for the first PTS. */
         block_Release( *pp_block );
@@ -227,7 +228,7 @@ static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
         case STATE_SYNC:
             /* New frame, set the Presentation Time Stamp */
             p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
-            if( p_sys->i_pts != 0 &&
+            if( p_sys->i_pts > VLC_TS_INVALID &&
                 p_sys->i_pts != date_Get( &p_sys->end_date ) )
             {
                 date_Set( &p_sys->end_date, p_sys->i_pts );
@@ -310,7 +311,7 @@ static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 
             /* Make sure we don't reuse the same pts twice */
             if( p_sys->i_pts == p_sys->bytestream.p_block->i_pts )
-                p_sys->i_pts = p_sys->bytestream.p_block->i_pts = 0;
+                p_sys->i_pts = p_sys->bytestream.p_block->i_pts = VLC_TS_INVALID;
 
             /* So p_block doesn't get re-added several times */
             *pp_block = block_BytestreamPop( &p_sys->bytestream );