Lock scheme #5: Applied the render queueing to the agc

webrtc/modules/audio_processing/gain_control_impl.h

Index: webrtc/modules/audio_processing/gain_control_impl.h
diff --git a/webrtc/modules/audio_processing/gain_control_impl.h b/webrtc/modules/audio_processing/gain_control_impl.h
index f24d200cf2216a05d4c162a655bcf8170d5bea37..243810c9bbea1480555c253b5a9a7118771d6a37 100644
--- a/webrtc/modules/audio_processing/gain_control_impl.h
+++ b/webrtc/modules/audio_processing/gain_control_impl.h
@@ -13,6 +13,8 @@
 
 #include <vector>
 
+#include "webrtc/base/scoped_ptr.h"
+#include "webrtc/common_audio/swap_queue.h"
 #include "webrtc/modules/audio_processing/include/audio_processing.h"
 #include "webrtc/modules/audio_processing/processing_component.h"
 
@@ -21,6 +23,21 @@ namespace webrtc {
 class AudioBuffer;
 class CriticalSectionWrapper;
 
+// Functor to use when supplying a verifier function for the queue item
+// verifcation.
+class AgcRenderQueueItemVerifier {
+ public:
+  explicit AgcRenderQueueItemVerifier(size_t minimum_capacity)
+      : minimum_capacity_(minimum_capacity) {}
+
+  bool operator()(const std::vector<int16_t>& v) const {
+    return v.capacity() >= minimum_capacity_;
+  }
+
+ private:
+  size_t minimum_capacity_;
+};
+
 class GainControlImpl : public GainControl,
                         public ProcessingComponent {
  public:
@@ -41,7 +58,16 @@ class GainControlImpl : public GainControl,
   bool is_limiter_enabled() const override;
   Mode mode() const override;
 
+  // Reads render side data that has been queued on the render call.
+  void ReadQueuedRenderData();
+
  private:
+  static const size_t kAllowedValuesOfSamplesPerFrame1 = 80;
+  static const size_t kAllowedValuesOfSamplesPerFrame2 = 160;
+  // TODO(peah): Decrease this once we properly handle hugely unbalanced
+  // reverse and forward call numbers.
+  static const size_t kMaxNumFramesToBuffer = 100;
+
   // GainControl implementation.
   int Enable(bool enable) override;
   int set_stream_analog_level(int level) override;
@@ -64,6 +90,8 @@ class GainControlImpl : public GainControl,
   int num_handles_required() const override;
   int GetHandleError(void* handle) const override;
 
+  void AllocateRenderQueue();
+
   const AudioProcessing* apm_;
   CriticalSectionWrapper* crit_;
   Mode mode_;
@@ -76,6 +104,12 @@ class GainControlImpl : public GainControl,
   int analog_capture_level_;
   bool was_analog_level_set_;
   bool stream_is_saturated_;
+
+  size_t render_queue_element_max_size_;
+  std::vector<int16_t> render_queue_buffer_;
+  std::vector<int16_t> capture_queue_buffer_;
+  rtc::scoped_ptr<SwapQueue<std::vector<int16_t>, AgcRenderQueueItemVerifier> >
+      render_signal_queue_;
 };
 }  // namespace webrtc