Moves channel-dependent audio input processing to separate encoder task queue

webrtc/voice_engine/shared_data.h

Index: webrtc/voice_engine/shared_data.h
diff --git a/webrtc/voice_engine/shared_data.h b/webrtc/voice_engine/shared_data.h
index e3014194547c5bac84444c68d98b2322a47cbf8f..5a86434542809679bb7eedf9c43bd1a64b38db86 100644
--- a/webrtc/voice_engine/shared_data.h
+++ b/webrtc/voice_engine/shared_data.h
@@ -15,6 +15,7 @@
 
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/scoped_ref_ptr.h"
+#include "webrtc/base/task_queue.h"
 #include "webrtc/modules/audio_device/include/audio_device.h"
 #include "webrtc/modules/audio_processing/include/audio_processing.h"
 #include "webrtc/modules/utility/include/process_thread.h"
@@ -46,6 +47,7 @@ public:
     OutputMixer* output_mixer() { return _outputMixerPtr; }
     rtc::CriticalSection* crit_sec() { return &_apiCritPtr; }
     ProcessThread* process_thread() { return _moduleProcessThreadPtr.get(); }
+    rtc::TaskQueue* encoder_queue() { return &encoder_queue_; }
 
     int NumOfSendingChannels();
     int NumOfPlayingChannels();
@@ -66,6 +68,9 @@ protected:
     TransmitMixer* _transmitMixerPtr;
     std::unique_ptr<AudioProcessing> audioproc_;
     std::unique_ptr<ProcessThread> _moduleProcessThreadPtr;
+    // |encoder_queue| is defined last to ensure all pending tasks are cancelled
+    // and deleted before any other members.
+    rtc::TaskQueue encoder_queue_;
 
     SharedData();
     virtual ~SharedData();