Moved date_Decrement to libvlc core from dirac.

include/vlc_mtime.h

@@ -136,5 +136,6 @@ VLC_EXPORT( void,    date_Set,       ( date_t *, mtime_t ) );
 VLC_EXPORT( mtime_t, date_Get,       ( const date_t * ) );
 VLC_EXPORT( void,    date_Move,      ( date_t *, mtime_t ) );
 VLC_EXPORT( mtime_t, date_Increment, ( date_t *, uint32_t ) );
+VLC_EXPORT( mtime_t, date_Decrement, ( date_t *, uint32_t ) );
 VLC_EXPORT( uint64_t, NTPtime64,     ( void ) );
 #endif /* !__VLC_MTIME_ */

modules/packetizer/dirac.c

@@ -266,26 +266,6 @@ static dirac_block_encap_t *dirac_GetBlockEncap( block_t *p_block )
  * General utility funcions
  */
 
-/* decrement a date. opposite to date_Increment */
-static mtime_t date_Decrement( date_t *p_date, uint32_t i_nb_samples )
-{
-    mtime_t i_dividend = (mtime_t)i_nb_samples * 1000000 * p_date->i_divider_den;
-    p_date->date -= i_dividend / p_date->i_divider_num;
-    unsigned u_rem_adjust = i_dividend % p_date->i_divider_num;
-
-    if( p_date->i_remainder < u_rem_adjust )
-    {
-        /* This is Bresenham algorithm. */
-        assert( p_date->i_remainder > -p_date->i_divider_num);
-        p_date->date -= 1;
-        p_date->i_remainder += p_date->i_divider_num;
-    }
-
-    p_date->i_remainder -= u_rem_adjust;
-
-    return p_date->date;
-}
-
 /**
  * given a chain of block_t, allocate and return an array containing
  * pointers to all the blocks. (Acts as a replacement for the old p_prev

src/libvlccore.sym

@@ -74,6 +74,7 @@ config_StringEscape
 config_StringUnescape
 convert_xml_special_chars
 date_Change
+date_Decrement
 date_Get
 date_Increment
 date_Init

src/misc/mtime.c

@@ -536,6 +536,33 @@ mtime_t date_Increment( date_t *p_date, uint32_t i_nb_samples )
     return p_date->date;
 }
 
+/**
+ * Decrement the date and return the result, taking into account
+ * rounding errors.
+ *
+ * \param date to decrement
+ * \param decrementation in number of samples
+ * \return date value
+ */
+mtime_t date_Decrement( date_t *p_date, uint32_t i_nb_samples )
+{
+    mtime_t i_dividend = (mtime_t)i_nb_samples * 1000000 * p_date->i_divider_den;
+    p_date->date -= i_dividend / p_date->i_divider_num;
+    unsigned i_rem_adjust = i_dividend % p_date->i_divider_num;
+
+    if( p_date->i_remainder < i_rem_adjust )
+    {
+        /* This is Bresenham algorithm. */
+        assert( p_date->i_remainder > -p_date->i_divider_num);
+        p_date->date -= 1;
+        p_date->i_remainder += p_date->i_divider_num;
+    }
+
+    p_date->i_remainder -= i_rem_adjust;
+
+    return p_date->date;
+}
+
 #ifndef HAVE_GETTIMEOFDAY
 
 #ifdef WIN32