Preparational work for an upcoming addition of a threadchecking scheme for APM

webrtc/modules/audio_processing/gain_control_impl.cc

Index: webrtc/modules/audio_processing/gain_control_impl.cc
diff --git a/webrtc/modules/audio_processing/gain_control_impl.cc b/webrtc/modules/audio_processing/gain_control_impl.cc
index 0eacd28686382c2bd8cffb17b340495915d47eb8..0f8dd88e532b982c841b3eb090ddbc88947eb10b 100644
--- a/webrtc/modules/audio_processing/gain_control_impl.cc
+++ b/webrtc/modules/audio_processing/gain_control_impl.cc
@@ -43,11 +43,16 @@ static const size_t kMaxNumFramesToBuffer = 100;
 
 }  // namespace
 
-GainControlImpl::GainControlImpl(const AudioProcessing* apm,
-                                 CriticalSectionWrapper* crit)
+GainControlImpl::GainControlImpl(
+    const AudioProcessing* apm,
+    CriticalSectionWrapper* crit,
+    const rtc::ThreadChecker* render_thread_checker,
+    const rtc::ThreadChecker* capture_thread_checker)
     : ProcessingComponent(),
       apm_(apm),
       crit_(crit),
+      render_thread_checker_(render_thread_checker),
+      capture_thread_checker_(capture_thread_checker),
       mode_(kAdaptiveAnalog),
       minimum_capture_level_(0),
       maximum_capture_level_(255),
@@ -62,6 +67,7 @@ GainControlImpl::GainControlImpl(const AudioProcessing* apm,
 GainControlImpl::~GainControlImpl() {}
 
 int GainControlImpl::ProcessRenderAudio(AudioBuffer* audio) {
+  RTC_DCHECK(render_thread_checker_->CalledOnValidThread());
   if (!is_component_enabled()) {
     return apm_->kNoError;
   }
@@ -220,6 +226,7 @@ int GainControlImpl::ProcessCaptureAudio(AudioBuffer* audio) {
 
 // TODO(ajm): ensure this is called under kAdaptiveAnalog.
 int GainControlImpl::set_stream_analog_level(int level) {
+  RTC_DCHECK(capture_thread_checker_->CalledOnValidThread());
   CriticalSectionScoped crit_scoped(crit_);
   was_analog_level_set_ = true;
   if (level < minimum_capture_level_ || level > maximum_capture_level_) {
@@ -231,6 +238,7 @@ int GainControlImpl::set_stream_analog_level(int level) {
 }
 
 int GainControlImpl::stream_analog_level() {
+  RTC_DCHECK(capture_thread_checker_->CalledOnValidThread());
   // TODO(ajm): enable this assertion?
   //assert(mode_ == kAdaptiveAnalog);