RTPReceiverAudio: Removed frequency from CNGPayloadType and cleaned up

webrtc/modules/rtp_rtcp/source/rtp_receiver_audio.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_receiver_audio.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_receiver_audio.cc b/webrtc/modules/rtp_rtcp/source/rtp_receiver_audio.cc
index 38b2830b79cbe9c3e903044b8c3b2eb746d49fdb..082d2a8b18514f215d0192e2dcee57ac71299198 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_receiver_audio.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_receiver_audio.cc
@@ -26,16 +26,12 @@ RTPReceiverStrategy* RTPReceiverStrategy::CreateAudioStrategy(
 RTPReceiverAudio::RTPReceiverAudio(RtpData* data_callback)
     : RTPReceiverStrategy(data_callback),
       TelephoneEventHandler(),
-      last_received_frequency_(8000),
       telephone_event_forward_to_decoder_(false),
       telephone_event_payload_type_(-1),
       cng_nb_payload_type_(-1),
       cng_wb_payload_type_(-1),
       cng_swb_payload_type_(-1),
       cng_fb_payload_type_(-1),
-      cng_payload_type_(-1),
-      g722_payload_type_(-1),
-      last_received_g722_(false),
       num_energy_(0),
       current_remote_energy_() {
   last_payload_.Audio.channels = 1;
@@ -61,53 +57,12 @@ bool RTPReceiverAudio::TelephoneEventPayloadType(
   return telephone_event_payload_type_ == payload_type;
 }
 
-bool RTPReceiverAudio::CNGPayloadType(int8_t payload_type,
-                                      uint32_t* frequency,
-                                      bool* cng_payload_type_has_changed) {
+bool RTPReceiverAudio::CNGPayloadType(int8_t payload_type) {
   rtc::CritScope lock(&crit_sect_);
-  *cng_payload_type_has_changed = false;
-
-  //  We can have four CNG on 8000Hz, 16000Hz, 32000Hz and 48000Hz.
-  if (cng_nb_payload_type_ == payload_type) {
-    *frequency = 8000;
-    if (cng_payload_type_ != -1 && cng_payload_type_ != cng_nb_payload_type_)
-      *cng_payload_type_has_changed = true;
-
-    cng_payload_type_ = cng_nb_payload_type_;
-    return true;
-  } else if (cng_wb_payload_type_ == payload_type) {
-    // if last received codec is G.722 we must use frequency 8000
-    if (last_received_g722_) {
-      *frequency = 8000;
-    } else {
-      *frequency = 16000;
-    }
-    if (cng_payload_type_ != -1 && cng_payload_type_ != cng_wb_payload_type_)
-      *cng_payload_type_has_changed = true;
-    cng_payload_type_ = cng_wb_payload_type_;
-    return true;
-  } else if (cng_swb_payload_type_ == payload_type) {
-    *frequency = 32000;
-    if ((cng_payload_type_ != -1) &&
-        (cng_payload_type_ != cng_swb_payload_type_))
-      *cng_payload_type_has_changed = true;
-    cng_payload_type_ = cng_swb_payload_type_;
-    return true;
-  } else if (cng_fb_payload_type_ == payload_type) {
-    *frequency = 48000;
-    if (cng_payload_type_ != -1 && cng_payload_type_ != cng_fb_payload_type_)
-      *cng_payload_type_has_changed = true;
-    cng_payload_type_ = cng_fb_payload_type_;
-    return true;
-  } else {
-    //  not CNG
-    if (g722_payload_type_ == payload_type) {
-      last_received_g722_ = true;
-    } else {
-      last_received_g722_ = false;
-    }
-  }
-  return false;
+  return payload_type == cng_nb_payload_type_ ||
+         payload_type == cng_wb_payload_type_ ||
+         payload_type == cng_swb_payload_type_ ||
+         payload_type == cng_fb_payload_type_;
 }
 
 bool RTPReceiverAudio::ShouldReportCsrcChanges(uint8_t payload_type) const {
@@ -157,7 +112,7 @@ int32_t RTPReceiverAudio::OnNewPayloadTypeCreated(
     telephone_event_payload_type_ = payload_type;
   }
   if (RtpUtility::StringCompare(payload_name, "cn", 2)) {
-    //  we can have three CNG on 8000Hz, 16000Hz and 32000Hz
+    // We support comfort noise at four different frequencies.
     if (frequency == 8000) {
       cng_nb_payload_type_ = payload_type;
     } else if (frequency == 16000) {
@@ -204,14 +159,6 @@ int32_t RTPReceiverAudio::ParseRtpPacket(WebRtcRTPHeader* rtp_header,
                                  is_red);
 }
 
-int RTPReceiverAudio::GetPayloadTypeFrequency() const {
-  rtc::CritScope lock(&crit_sect_);
-  if (last_received_g722_) {
-    return 8000;
-  }
-  return last_received_frequency_;
-}
-
 RTPAliveType RTPReceiverAudio::ProcessDeadOrAlive(
     uint16_t last_payload_length) const {
 
@@ -225,26 +172,10 @@ RTPAliveType RTPReceiverAudio::ProcessDeadOrAlive(
 }
 
 void RTPReceiverAudio::CheckPayloadChanged(int8_t payload_type,
-                                           PayloadUnion* specific_payload,
+                                           PayloadUnion* /* specific_payload */,
                                            bool* should_discard_changes) {
-  *should_discard_changes = false;
-
-  if (TelephoneEventPayloadType(payload_type)) {
-    // Don't do callbacks for DTMF packets.
-    *should_discard_changes = true;
-    return;
-  }
-  // frequency is updated for CNG
-  bool cng_payload_type_has_changed = false;
-  bool is_cng_payload_type = CNGPayloadType(payload_type,
-                                            &specific_payload->Audio.frequency,
-                                            &cng_payload_type_has_changed);
-
-  if (is_cng_payload_type) {
-    // Don't do callbacks for DTMF packets.
-    *should_discard_changes = true;
-    return;
-  }
+  *should_discard_changes =
+      TelephoneEventPayloadType(payload_type) || CNGPayloadType(payload_type);
 }
 
 int RTPReceiverAudio::Energy(uint8_t array_of_energy[kRtpCsrcSize]) const {
@@ -337,16 +268,8 @@ int32_t RTPReceiverAudio::ParseAudioCodecSpecific(
   {
     rtc::CritScope lock(&crit_sect_);
 
-    if (!telephone_event_packet) {
-      last_received_frequency_ = audio_specific.frequency;
-    }
-
     // Check if this is a CNG packet, receiver might want to know
-    uint32_t ignored;
-    bool also_ignored;
-    if (CNGPayloadType(rtp_header->header.payloadType,
-                       &ignored,
-                       &also_ignored)) {
+    if (CNGPayloadType(rtp_header->header.payloadType)) {
       rtp_header->type.Audio.isCNG = true;
       rtp_header->frameType = kAudioFrameCN;
     } else {