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 b32680bfc58fda332344d720745ff5d12f0fba9f..533f067f345cfcb450da68bf82bf753cb2b0dfcb 100644
--- a/webrtc/modules/audio_processing/gain_control_impl.cc
+++ b/webrtc/modules/audio_processing/gain_control_impl.cc
@@ -38,11 +38,16 @@ int16_t MapSetting(GainControl::Mode mode) {
 const size_t GainControlImpl::kAllowedValuesOfSamplesPerFrame1;
 const size_t GainControlImpl::kAllowedValuesOfSamplesPerFrame2;
 
-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),
@@ -59,6 +64,7 @@ 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;
   }
@@ -213,6 +219,7 @@ 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());
   // TODO(peah): Verify that this is really needed to do the reading
   // here as well as in ProcessStream. It works since these functions
   // are called from the same thread, but it is not nice to do it in two
@@ -230,6 +237,7 @@ 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);