Move RtcpPacketTypeCounter and observer to rtcp_statistics.h

Old location was common_types.h.

Bug: webrtc:5876
Change-Id: I87c0c8bb7ae181292087df741351016683332988
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135288
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27863}

modules/rtp_rtcp/include/rtcp_statistics.h

@@ -32,5 +32,71 @@ class RtcpStatisticsCallback {
   virtual void CNameChanged(const char* cname, uint32_t ssrc) = 0;
 };
 
+// Statistics for RTCP packet types.
+struct RtcpPacketTypeCounter {
+  RtcpPacketTypeCounter()
+      : first_packet_time_ms(-1),
+        nack_packets(0),
+        fir_packets(0),
+        pli_packets(0),
+        nack_requests(0),
+        unique_nack_requests(0) {}
+
+  void Add(const RtcpPacketTypeCounter& other) {
+    nack_packets += other.nack_packets;
+    fir_packets += other.fir_packets;
+    pli_packets += other.pli_packets;
+    nack_requests += other.nack_requests;
+    unique_nack_requests += other.unique_nack_requests;
+    if (other.first_packet_time_ms != -1 &&
+        (other.first_packet_time_ms < first_packet_time_ms ||
+         first_packet_time_ms == -1)) {
+      // Use oldest time.
+      first_packet_time_ms = other.first_packet_time_ms;
+    }
+  }
+
+  void Subtract(const RtcpPacketTypeCounter& other) {
+    nack_packets -= other.nack_packets;
+    fir_packets -= other.fir_packets;
+    pli_packets -= other.pli_packets;
+    nack_requests -= other.nack_requests;
+    unique_nack_requests -= other.unique_nack_requests;
+    if (other.first_packet_time_ms != -1 &&
+        (other.first_packet_time_ms > first_packet_time_ms ||
+         first_packet_time_ms == -1)) {
+      // Use youngest time.
+      first_packet_time_ms = other.first_packet_time_ms;
+    }
+  }
+
+  int64_t TimeSinceFirstPacketInMs(int64_t now_ms) const {
+    return (first_packet_time_ms == -1) ? -1 : (now_ms - first_packet_time_ms);
+  }
+
+  int UniqueNackRequestsInPercent() const {
+    if (nack_requests == 0) {
+      return 0;
+    }
+    return static_cast<int>((unique_nack_requests * 100.0f / nack_requests) +
+                            0.5f);
+  }
+
+  int64_t first_packet_time_ms;   // Time when first packet is sent/received.
+  uint32_t nack_packets;          // Number of RTCP NACK packets.
+  uint32_t fir_packets;           // Number of RTCP FIR packets.
+  uint32_t pli_packets;           // Number of RTCP PLI packets.
+  uint32_t nack_requests;         // Number of NACKed RTP packets.
+  uint32_t unique_nack_requests;  // Number of unique NACKed RTP packets.
+};
+
+class RtcpPacketTypeCounterObserver {
+ public:
+  virtual ~RtcpPacketTypeCounterObserver() {}
+  virtual void RtcpPacketTypesCounterUpdated(
+      uint32_t ssrc,
+      const RtcpPacketTypeCounter& packet_counter) = 0;
+};
+
 }  // namespace webrtc
 #endif  // MODULES_RTP_RTCP_INCLUDE_RTCP_STATISTICS_H_