Lock scheme #8: Introduced the new locking scheme

webrtc/modules/audio_processing/echo_control_mobile_impl.cc

Index: webrtc/modules/audio_processing/echo_control_mobile_impl.cc
diff --git a/webrtc/modules/audio_processing/echo_control_mobile_impl.cc b/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
index a653519fe22a70829c562ed53538857f9b1269cb..ca5f0b3a2a28106eba6f49d4e2f13f076836e2c1 100644
--- a/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
+++ b/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
@@ -15,7 +15,6 @@
 
 #include "webrtc/modules/audio_processing/aecm/echo_control_mobile.h"
 #include "webrtc/modules/audio_processing/audio_buffer.h"
-#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/include/logging.h"
 
 namespace webrtc {
@@ -70,11 +69,13 @@ size_t EchoControlMobile::echo_path_size_bytes() {
 
 EchoControlMobileImpl::EchoControlMobileImpl(
     const AudioProcessing* apm,
-    CriticalSectionWrapper* crit,
+    rtc::CriticalSection* crit_render,
+    rtc::CriticalSection* crit_capture,
     const rtc::ThreadChecker* render_thread_checker)
     : ProcessingComponent(),
       apm_(apm),
-      crit_(crit),
+      crit_render_(crit_render),
+      crit_capture_(crit_capture),
       render_thread_checker_(render_thread_checker),
       routing_mode_(kSpeakerphone),
       comfort_noise_enabled_(true),
@@ -124,7 +125,11 @@ int EchoControlMobileImpl::ProcessRenderAudio(const AudioBuffer* audio) {
 
   // Insert the samples into the queue.
   if (!render_signal_queue_->Insert(&render_queue_buffer_)) {
-    ReadQueuedRenderData();
+    // The data queue is full and needs to be emptied.
+    {
+      rtc::CritScope cs_capture(crit_capture_);
+      ReadQueuedRenderData();
+    }
 
     // Retry the insert (should always work).
     RTC_DCHECK_EQ(render_signal_queue_->Insert(&render_queue_buffer_), true);
@@ -205,7 +210,9 @@ int EchoControlMobileImpl::ProcessCaptureAudio(AudioBuffer* audio) {
 }
 
 int EchoControlMobileImpl::Enable(bool enable) {
-  CriticalSectionScoped crit_scoped(crit_);
+  // Run in a single-threaded manner
+  rtc::CritScope cs_render(crit_render_);
+  rtc::CritScope cs_capture(crit_capture_);
   // Ensure AEC and AECM are not both enabled.
   if (enable && apm_->echo_cancellation()->is_enabled()) {
     return apm_->kBadParameterError;
@@ -215,11 +222,12 @@ int EchoControlMobileImpl::Enable(bool enable) {
 }
 
 bool EchoControlMobileImpl::is_enabled() const {
+  rtc::CritScope cs(crit_capture_);
   return is_component_enabled();
 }
 
 int EchoControlMobileImpl::set_routing_mode(RoutingMode mode) {
-  CriticalSectionScoped crit_scoped(crit_);
+  rtc::CritScope cs(crit_capture_);
   if (MapSetting(mode) == -1) {
     return apm_->kBadParameterError;
   }
@@ -230,22 +238,25 @@ int EchoControlMobileImpl::set_routing_mode(RoutingMode mode) {
 
 EchoControlMobile::RoutingMode EchoControlMobileImpl::routing_mode()
     const {
+  rtc::CritScope cs(crit_capture_);
   return routing_mode_;
 }
 
 int EchoControlMobileImpl::enable_comfort_noise(bool enable) {
-  CriticalSectionScoped crit_scoped(crit_);
+  rtc::CritScope cs(crit_capture_);
   comfort_noise_enabled_ = enable;
   return Configure();
 }
 
 bool EchoControlMobileImpl::is_comfort_noise_enabled() const {
+  rtc::CritScope cs(crit_capture_);
   return comfort_noise_enabled_;
 }
 
 int EchoControlMobileImpl::SetEchoPath(const void* echo_path,
                                        size_t size_bytes) {
-  CriticalSectionScoped crit_scoped(crit_);
+  rtc::CritScope cs_render(crit_render_);
+  rtc::CritScope cs_capture(crit_capture_);
   if (echo_path == NULL) {
     return apm_->kNullPointerError;
   }
@@ -264,7 +275,7 @@ int EchoControlMobileImpl::SetEchoPath(const void* echo_path,
 
 int EchoControlMobileImpl::GetEchoPath(void* echo_path,
                                        size_t size_bytes) const {
-  CriticalSectionScoped crit_scoped(crit_);
+  rtc::CritScope cs(crit_capture_);
   if (echo_path == NULL) {
     return apm_->kNullPointerError;
   }
@@ -286,6 +297,7 @@ int EchoControlMobileImpl::GetEchoPath(void* echo_path,
 }
 
 int EchoControlMobileImpl::Initialize() {
+  // Only called from within APM, hence no locking is needed.
   if (!is_component_enabled()) {
     return apm_->kNoError;
   }
@@ -330,14 +342,17 @@ void EchoControlMobileImpl::AllocateRenderQueue() {
 }
 
 void* EchoControlMobileImpl::CreateHandle() const {
+  // Only called from within APM, hence no locking is needed.
   return WebRtcAecm_Create();
 }
 
 void EchoControlMobileImpl::DestroyHandle(void* handle) const {
+  // Only called from within APM, hence no locking is needed.
   WebRtcAecm_Free(static_cast<Handle*>(handle));
 }
 
 int EchoControlMobileImpl::InitializeHandle(void* handle) const {
+  // Only called from within APM, hence no locking is needed.
   assert(handle != NULL);
   Handle* my_handle = static_cast<Handle*>(handle);
   if (WebRtcAecm_Init(my_handle, apm_->proc_sample_rate_hz()) != 0) {
@@ -355,6 +370,7 @@ int EchoControlMobileImpl::InitializeHandle(void* handle) const {
 }
 
 int EchoControlMobileImpl::ConfigureHandle(void* handle) const {
+  // Only called from within APM, hence no locking is needed.
   AecmConfig config;
   config.cngMode = comfort_noise_enabled_;
   config.echoMode = MapSetting(routing_mode_);
@@ -363,11 +379,13 @@ int EchoControlMobileImpl::ConfigureHandle(void* handle) const {
 }
 
 int EchoControlMobileImpl::num_handles_required() const {
+  // Only called from within APM, hence no locking is needed.
   return apm_->num_output_channels() *
          apm_->num_reverse_channels();
 }
 
 int EchoControlMobileImpl::GetHandleError(void* handle) const {
+  // Only called from within APM, hence no locking is needed.
   assert(handle != NULL);
   return AudioProcessing::kUnspecifiedError;
 }