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 0e57f9d2505e7aad74efb5c44d62972da891b906..550f80e5d90da53a35572ac44d96d8bffa91bcd3 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"
@@ -49,6 +50,7 @@ public:
     AudioDeviceModule::AudioLayer audio_device_layer() const {
       return _audioDeviceLayer;
     }
+    rtc::TaskQueue* encoder_queue() { return &encoder_queue_; }
     void set_audio_device_layer(AudioDeviceModule::AudioLayer layer) {
       _audioDeviceLayer = layer;
     }
@@ -72,8 +74,10 @@ protected:
     TransmitMixer* _transmitMixerPtr;
     std::unique_ptr<AudioProcessing> audioproc_;
     std::unique_ptr<ProcessThread> _moduleProcessThreadPtr;
-
     AudioDeviceModule::AudioLayer _audioDeviceLayer;
+    // |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();