Expose Set and Get Recording/Playout sample rate apis

Message:
This is the first cl to add Set/Get Recording and Playout sample rate apis.
In this cl, apis are enabled but returns -1, will add android
implementation in next cl, it's easy for review and coding.

Description:
This CL expose fours voice engine apis,
SetRecordingSampleRate,
RecordingSampleRate, 
SetPlayoutSampleRate,
PlayoutSampleRate. 

BUG=none
TEST=trybots
Review URL: https://webrtc-codereview.appspot.com/626004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3239 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/voice_engine/include/voe_hardware.h

@@ -113,6 +113,12 @@ public:
     // Not supported
     virtual int GetLoudspeakerStatus(bool& enabled) = 0;
 
+    // Native sample rate controls (samples/sec)
+    virtual int SetRecordingSampleRate(unsigned int samples_per_sec) = 0;
+    virtual int RecordingSampleRate(unsigned int* samples_per_sec) const = 0;
+    virtual int SetPlayoutSampleRate(unsigned int samples_per_sec) = 0;
+    virtual int PlayoutSampleRate(unsigned int* samples_per_sec) const = 0;
+
     // *Experimental - not recommended for use.*
     // Enables the Windows Core Audio built-in AEC. Fails on other platforms.
     //

webrtc/voice_engine/voe_hardware_impl.cc

@@ -818,6 +818,46 @@ bool VoEHardwareImpl::BuiltInAECIsEnabled() const
     return _shared->audio_device()->BuiltInAECIsEnabled();
 }
 
+int VoEHardwareImpl::SetRecordingSampleRate(unsigned int samples_per_sec) {
+  WEBRTC_TRACE(kTraceApiCall, kTraceVoice, VoEId(_shared->instance_id(), -1),
+               "%s", __FUNCTION__);
+  if (!_shared->statistics().Initialized()) {
+    _shared->SetLastError(VE_NOT_INITED, kTraceError);
+    return false;
+  }
+  return _shared->audio_device()->SetRecordingSampleRate(samples_per_sec);
+}
+
+int VoEHardwareImpl::RecordingSampleRate(unsigned int* samples_per_sec) const {
+  WEBRTC_TRACE(kTraceApiCall, kTraceVoice, VoEId(_shared->instance_id(), -1),
+               "%s", __FUNCTION__);
+  if (!_shared->statistics().Initialized()) {
+    _shared->SetLastError(VE_NOT_INITED, kTraceError);
+    return false;
+  }
+  return _shared->audio_device()->RecordingSampleRate(samples_per_sec);
+}
+
+int VoEHardwareImpl::SetPlayoutSampleRate(unsigned int samples_per_sec) {
+  WEBRTC_TRACE(kTraceApiCall, kTraceVoice, VoEId(_shared->instance_id(), -1),
+               "%s", __FUNCTION__);
+  if (!_shared->statistics().Initialized()) {
+    _shared->SetLastError(VE_NOT_INITED, kTraceError);
+    return false;
+  }
+  return _shared->audio_device()->SetPlayoutSampleRate(samples_per_sec);
+}
+
+int VoEHardwareImpl::PlayoutSampleRate(unsigned int* samples_per_sec) const {
+  WEBRTC_TRACE(kTraceApiCall, kTraceVoice, VoEId(_shared->instance_id(), -1),
+               "%s", __FUNCTION__);
+  if (!_shared->statistics().Initialized()) {
+    _shared->SetLastError(VE_NOT_INITED, kTraceError);
+    return false;
+  }
+  return _shared->audio_device()->PlayoutSampleRate(samples_per_sec);
+}
+
 #endif  // WEBRTC_VOICE_ENGINE_HARDWARE_API
 
 } // namespace webrtc

webrtc/voice_engine/voe_hardware_impl.h

@@ -65,6 +65,11 @@ public:
     virtual int EnableBuiltInAEC(bool enable);
     virtual bool BuiltInAECIsEnabled() const;
 
+    virtual int SetRecordingSampleRate(unsigned int samples_per_sec);
+    virtual int RecordingSampleRate(unsigned int* samples_per_sec) const;
+    virtual int SetPlayoutSampleRate(unsigned int samples_per_sec);
+    virtual int PlayoutSampleRate(unsigned int* samples_per_sec) const;
+
 protected:
     VoEHardwareImpl(voe::SharedData* shared);
     virtual ~VoEHardwareImpl();