src/dvbpsi.c: Do not check continuity counter when this PID has not been seen before

Do not check continuity counter when this PID has not been seen before.
This used to produce false positives.

src/dvbpsi.c

@@ -235,30 +235,36 @@ void dvbpsi_PushPacket(dvbpsi_t *handle, uint8_t* p_data)
     }
 
     /* Continuity check */
-    i_expected_counter = (p_decoder->i_continuity_counter + 1) & 0xf;
-    p_decoder->i_continuity_counter = p_data[3] & 0xf;
-
-    if (i_expected_counter == ((p_decoder->i_continuity_counter + 1) & 0xf)
-        && !p_decoder->b_discontinuity)
+    bool b_first = (p_decoder->i_continuity_counter == 0xFF);
+    if (b_first)
+        p_decoder->i_continuity_counter = p_data[3] & 0xf;
+    else
     {
-        dvbpsi_error(handle, "PSI decoder",
+        i_expected_counter = (p_decoder->i_continuity_counter + 1) & 0xf;
+        p_decoder->i_continuity_counter = p_data[3] & 0xf;
+
+        if (i_expected_counter == ((p_decoder->i_continuity_counter + 1) & 0xf)
+            && !p_decoder->b_discontinuity)
+        {
+            dvbpsi_error(handle, "PSI decoder",
                      "TS duplicate (received %d, expected %d) for PID %d",
                      p_decoder->i_continuity_counter, i_expected_counter,
                      ((uint16_t)(p_data[1] & 0x1f) << 8) | p_data[2]);
-        return;
-    }
+            return;
+        }
 
-    if (i_expected_counter != p_decoder->i_continuity_counter)
-    {
-        dvbpsi_error(handle, "PSI decoder",
+        if (i_expected_counter != p_decoder->i_continuity_counter)
+        {
+            dvbpsi_error(handle, "PSI decoder",
                      "TS discontinuity (received %d, expected %d) for PID %d",
                      p_decoder->i_continuity_counter, i_expected_counter,
                      ((uint16_t)(p_data[1] & 0x1f) << 8) | p_data[2]);
-        p_decoder->b_discontinuity = true;
-        if (p_decoder->p_current_section)
-        {
-            dvbpsi_DeletePSISections(p_decoder->p_current_section);
-            p_decoder->p_current_section = NULL;
+            p_decoder->b_discontinuity = true;
+            if (p_decoder->p_current_section)
+            {
+                dvbpsi_DeletePSISections(p_decoder->p_current_section);
+                p_decoder->p_current_section = NULL;
+            }
         }
     }