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

webrtc/base/swap_queue.h

Index: webrtc/base/swap_queue.h
diff --git a/webrtc/base/swap_queue.h b/webrtc/base/swap_queue.h
index 1851309bd7356d808dc45fadad23622bbcb4ea8b..a810975896615b714dd3d8678ca6e442eee9131e 100644
--- a/webrtc/base/swap_queue.h
+++ b/webrtc/base/swap_queue.h
@@ -104,6 +104,13 @@ class SwapQueue {
     RTC_DCHECK(VerifyQueueSlots());
   }
 
+  size_t Capacity() const { return queue_.size(); }
+
+  size_t Size() const {
+    rtc::CritScope cs(&crit_queue_);
+    return num_elements_;

[tommi, 2017/03/28 13:01:40]

returning a value that requires a lock?  (the returned value can't be assumed to
be correct, since a lock isn't held when examined).  Can we instead require that
the calling thread is the same thread as the value can change on?

+  }
+
   // Resets the queue to have zero content wile maintaining the queue size.
   void Clear() {
     rtc::CritScope cs(&crit_queue_);