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APM: Make the GetStatistics call independent of the locks in APM

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This CL changes the GetStatistics call in the audio processing module
(APM) to not aquire the render or capture locks in APM, while still
being thread-safe.
This change eliminates the risk of thread-priority inversion due to the
GetStatistics call.

Apart from the above the CL:
-Corrects the GetStatistics to not be const (it was const even though it
 aquired locks).
-Slightly changes the statistics reporting, so that the stats received
may be older than the most recent stats reported.

Bug: webrtc:11241
Change-Id: I00deb5507e004cbe6e4a19a8bad357491f86f4ab
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/163982
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30131}
This commit is contained in:
Per Åhgren
2019-12-30 14:32:14 +01:00
committed by Commit Bot
parent a43777dead
commit cf4c872dbd
7 changed files with 90 additions and 67 deletions
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26
modules/audio_processing/audio_processing_impl.h
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@ -118,7 +118,12 @@ class AudioProcessingImpl : public AudioProcessing {
bool was_stream_delay_set() const override
RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_capture_);
AudioProcessingStats GetStatistics(bool has_remote_tracks) const override;
AudioProcessingStats GetStatistics(bool has_remote_tracks) override {
return GetStatistics();
}
AudioProcessingStats GetStatistics() override {
return stats_reporter_.GetStatistics();
}
// TODO(peah): Remove MutateConfig once the new API allows that.
void MutateConfig(rtc::FunctionView<void(AudioProcessing::Config*)> mutator);
@ -444,6 +449,25 @@ class AudioProcessingImpl : public AudioProcessing {
std::unique_ptr<AudioBuffer> render_audio;
} render_ RTC_GUARDED_BY(crit_render_);
// Class for statistics reporting. The class is thread-safe and no lock is
// needed when accessing it.
class ApmStatsReporter {
public:
ApmStatsReporter();
~ApmStatsReporter();
// Returns the most recently reported statistics.
AudioProcessingStats GetStatistics();
// Update the cached statistics.
void UpdateStatistics(const AudioProcessingStats& new_stats);
private:
rtc::CriticalSection crit_stats_;
AudioProcessingStats cached_stats_ RTC_GUARDED_BY(crit_stats_);
SwapQueue<AudioProcessingStats> stats_message_queue_;
} stats_reporter_;
std::vector<float> aec_render_queue_buffer_ RTC_GUARDED_BY(crit_render_);
std::vector<float> aec_capture_queue_buffer_ RTC_GUARDED_BY(crit_capture_);