allow to change some fields in existing packets

mpeg/pes.h

@@ -123,7 +123,8 @@ static inline void pes_set_pts(uint8_t *p_pes, uint64_t i_pts)
     p_pes[7] |= 0x80;
     if (p_pes[8] < 5)
         p_pes[8] = 5;
-    p_pes[9] = 0x21 | ((i_pts >> 29) & 0xe);
+    p_pes[9] &= 0x10;
+    p_pes[9] |= 0x21 | ((i_pts >> 29) & 0xe);
     p_pes[10] = (i_pts >> 22) & 0xff;
     p_pes[11] = 0x1 | ((i_pts >> 14) & 0xfe);
     p_pes[12] = (i_pts >> 7) & 0xff;

mpeg/ts.h

@@ -216,6 +216,11 @@ static inline void tsaf_set_discontinuity(uint8_t *p_ts)
     p_ts[5] |= 0x80;
 }
 
+static inline void tsaf_clear_discontinuity(uint8_t *p_ts)
+{
+    p_ts[5] &= ~0x80;
+}
+
 static inline bool tsaf_has_discontinuity(const uint8_t *p_ts)
 {
     return !!(p_ts[5] & 0x80);