Change NetEq::InsertPacket to take an RTPHeader

It used to take a WebRtcRTPHeader as input, which has an RTPHeader as
a member. None of the other member in WebRtcRTPHeader where used in
NetEq.

This CL adapts the production code; tests and tools will be converted
in a follow-up CL.

BUG=webrtc:7467

Review-Url: https://codereview.webrtc.org/2807273004
Cr-Commit-Position: refs/heads/master@{#17652}
diff --git a/webrtc/modules/audio_coding/neteq/neteq_impl.cc b/webrtc/modules/audio_coding/neteq/neteq_impl.cc
index 501e567..89bddec 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_impl.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_impl.cc
@@ -131,7 +131,7 @@
 
 NetEqImpl::~NetEqImpl() = default;
 
-int NetEqImpl::InsertPacket(const WebRtcRTPHeader& rtp_header,
+int NetEqImpl::InsertPacket(const RTPHeader& rtp_header,
                             rtc::ArrayView<const uint8_t> payload,
                             uint32_t receive_timestamp) {
   rtc::MsanCheckInitialized(payload);
@@ -581,7 +581,7 @@
 
 // Methods below this line are private.
 
-int NetEqImpl::InsertPacketInternal(const WebRtcRTPHeader& rtp_header,
+int NetEqImpl::InsertPacketInternal(const RTPHeader& rtp_header,
                                     rtc::ArrayView<const uint8_t> payload,
                                     uint32_t receive_timestamp) {
   if (payload.empty()) {
@@ -594,24 +594,24 @@
   packet_list.push_back([&rtp_header, &payload] {
     // Convert to Packet.
     Packet packet;
-    packet.payload_type = rtp_header.header.payloadType;
-    packet.sequence_number = rtp_header.header.sequenceNumber;
-    packet.timestamp = rtp_header.header.timestamp;
+    packet.payload_type = rtp_header.payloadType;
+    packet.sequence_number = rtp_header.sequenceNumber;
+    packet.timestamp = rtp_header.timestamp;
     packet.payload.SetData(payload.data(), payload.size());
     // Waiting time will be set upon inserting the packet in the buffer.
     RTC_DCHECK(!packet.waiting_time);
     return packet;
   }());
 
-  bool update_sample_rate_and_channels = first_packet_ ||
-    (rtp_header.header.ssrc != ssrc_);
+  bool update_sample_rate_and_channels =
+      first_packet_ || (rtp_header.ssrc != ssrc_);
 
   if (update_sample_rate_and_channels) {
     // Reset timestamp scaling.
     timestamp_scaler_->Reset();
   }
 
-  if (!decoder_database_->IsRed(rtp_header.header.payloadType)) {
+  if (!decoder_database_->IsRed(rtp_header.payloadType)) {
     // Scale timestamp to internal domain (only for some codecs).
     timestamp_scaler_->ToInternal(&packet_list);
   }
@@ -627,14 +627,14 @@
     // Note: |first_packet_| will be cleared further down in this method, once
     // the packet has been successfully inserted into the packet buffer.
 
-    rtcp_.Init(rtp_header.header.sequenceNumber);
+    rtcp_.Init(rtp_header.sequenceNumber);
 
     // Flush the packet buffer and DTMF buffer.
     packet_buffer_->Flush();
     dtmf_buffer_->Flush();
 
     // Store new SSRC.
-    ssrc_ = rtp_header.header.ssrc;
+    ssrc_ = rtp_header.ssrc;
 
     // Update audio buffer timestamp.
     sync_buffer_->IncreaseEndTimestamp(main_timestamp - timestamp_);
@@ -644,19 +644,19 @@
   }
 
   // Update RTCP statistics, only for regular packets.
-  rtcp_.Update(rtp_header.header, receive_timestamp);
+  rtcp_.Update(rtp_header, receive_timestamp);
 
   if (nack_enabled_) {
     RTC_DCHECK(nack_);
     if (update_sample_rate_and_channels) {
       nack_->Reset();
     }
-    nack_->UpdateLastReceivedPacket(rtp_header.header.sequenceNumber,
-                                    rtp_header.header.timestamp);
+    nack_->UpdateLastReceivedPacket(rtp_header.sequenceNumber,
+                                    rtp_header.timestamp);
   }
 
   // Check for RED payload type, and separate payloads into several packets.
-  if (decoder_database_->IsRed(rtp_header.header.payloadType)) {
+  if (decoder_database_->IsRed(rtp_header.payloadType)) {
     if (!red_payload_splitter_->SplitRed(&packet_list)) {
       return kRedundancySplitError;
     }
@@ -675,7 +675,7 @@
 
   // Update main_timestamp, if new packets appear in the list
   // after RED splitting.
-  if (decoder_database_->IsRed(rtp_header.header.payloadType)) {
+  if (decoder_database_->IsRed(rtp_header.payloadType)) {
     timestamp_scaler_->ToInternal(&packet_list);
     main_timestamp = packet_list.front().timestamp;
     main_payload_type = packet_list.front().payload_type;