Not streaming packets of silence.

remoting/host/audio_capturer_win.cc

Index: remoting/host/audio_capturer_win.cc
diff --git a/remoting/host/audio_capturer_win.cc b/remoting/host/audio_capturer_win.cc
index 8a256454fac9362d4a5774fb85a00c1cc1cd4328..26e06fb02504ed1500eab087a953b48908c39692 100644
--- a/remoting/host/audio_capturer_win.cc
+++ b/remoting/host/audio_capturer_win.cc
@@ -18,6 +18,7 @@
 #include "base/win/scoped_com_initializer.h"
 #include "base/win/scoped_comptr.h"
 #include "remoting/host/audio_capturer.h"
+#include "remoting/host/audio_capturer_util.h"
 #include "remoting/proto/audio.pb.h"
 
 namespace {
@@ -133,7 +134,7 @@ bool AudioCapturerWin::Start(const PacketCapturedCallback& callback) {
     case WAVE_FORMAT_IEEE_FLOAT:
       // Intentional fall-through.
     case WAVE_FORMAT_PCM:
-      if (!AudioCapturer::IsValidSampleRate(wave_format_ex_->nSamplesPerSec)) {
+      if (!IsValidSampleRate(wave_format_ex_->nSamplesPerSec)) {
         LOG(ERROR) << "Host sampling rate is neither 44.1 kHz nor 48 kHz.";
         return false;
       }
@@ -153,8 +154,7 @@ bool AudioCapturerWin::Start(const PacketCapturedCallback& callback) {
           static_cast<WAVEFORMATEX*>(wave_format_ex_));
       if (IsEqualGUID(KSDATAFORMAT_SUBTYPE_IEEE_FLOAT,
                       wave_format_extensible->SubFormat)) {
-        if (!AudioCapturer::IsValidSampleRate(
-                wave_format_extensible->Format.nSamplesPerSec)) {
+        if (!IsValidSampleRate(wave_format_extensible->Format.nSamplesPerSec)) {
           LOG(ERROR) << "Host sampling rate is neither 44.1 kHz nor 48 kHz.";
           return false;
         }
@@ -237,7 +237,7 @@ bool AudioCapturerWin::IsRunning() {
 }
 
 void AudioCapturerWin::DoCapture() {
-  DCHECK(AudioCapturer::IsValidSampleRate(sampling_rate_));
+  DCHECK(IsValidSampleRate(sampling_rate_));
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(IsRunning());
 
@@ -268,7 +268,8 @@ void AudioCapturerWin::DoCapture() {
     packet->set_data(data, frames * wave_format_ex_->nBlockAlign);
     packet->set_sampling_rate(sampling_rate_);
 
-    callback_.Run(packet.Pass());
+    if (!IsPacketOfSilence(packet.get()))
+      callback_.Run(packet.Pass());
 
     hr = audio_capture_client_->ReleaseBuffer(frames);
     if (FAILED(hr)) {