audio_mixer_impl.h (2839B)
1 /* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef MODULES_AUDIO_MIXER_AUDIO_MIXER_IMPL_H_ 12 #define MODULES_AUDIO_MIXER_AUDIO_MIXER_IMPL_H_ 13 14 #include <stddef.h> 15 16 #include <memory> 17 #include <vector> 18 19 #include "api/array_view.h" 20 #include "api/audio/audio_frame.h" 21 #include "api/audio/audio_mixer.h" 22 #include "api/scoped_refptr.h" 23 #include "modules/audio_mixer/frame_combiner.h" 24 #include "modules/audio_mixer/output_rate_calculator.h" 25 #include "rtc_base/synchronization/mutex.h" 26 #include "rtc_base/thread_annotations.h" 27 28 namespace webrtc { 29 30 class AudioMixerImpl : public AudioMixer { 31 public: 32 struct SourceStatus; 33 34 // AudioProcessing only accepts 10 ms frames. 35 static const int kFrameDurationInMs = 10; 36 37 static scoped_refptr<AudioMixerImpl> Create(); 38 39 static scoped_refptr<AudioMixerImpl> Create( 40 std::unique_ptr<OutputRateCalculator> output_rate_calculator, 41 bool use_limiter); 42 43 ~AudioMixerImpl() override; 44 45 AudioMixerImpl(const AudioMixerImpl&) = delete; 46 AudioMixerImpl& operator=(const AudioMixerImpl&) = delete; 47 48 // AudioMixer functions 49 bool AddSource(Source* audio_source) override; 50 void RemoveSource(Source* audio_source) override; 51 52 void Mix(size_t number_of_channels, 53 AudioFrame* audio_frame_for_mixing) override 54 RTC_LOCKS_EXCLUDED(mutex_); 55 56 protected: 57 AudioMixerImpl(std::unique_ptr<OutputRateCalculator> output_rate_calculator, 58 bool use_limiter); 59 60 private: 61 struct HelperContainers; 62 63 void UpdateSourceCountStats() RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_); 64 65 // Fetches audio frames to mix from sources. 66 ArrayView<AudioFrame* const> GetAudioFromSources(int output_frequency) 67 RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_); 68 69 // The critical section lock guards audio source insertion and 70 // removal, which can be done from any thread. The race checker 71 // checks that mixing is done sequentially. 72 mutable Mutex mutex_; 73 74 std::unique_ptr<OutputRateCalculator> output_rate_calculator_; 75 76 // List of all audio sources. 77 std::vector<std::unique_ptr<SourceStatus>> audio_source_list_ 78 RTC_GUARDED_BY(mutex_); 79 const std::unique_ptr<HelperContainers> helper_containers_ 80 RTC_GUARDED_BY(mutex_); 81 82 // Component that handles actual adding of audio frames. 83 FrameCombiner frame_combiner_; 84 85 // The highest source count this mixer has ever had. Used for UMA stats. 86 size_t max_source_count_ever_ = 0; 87 }; 88 } // namespace webrtc 89 90 #endif // MODULES_AUDIO_MIXER_AUDIO_MIXER_IMPL_H_