mirror of https://github.com/auygun/kaliber.git
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
#ifndef ENGINE_AUDIO_MIXER_INPUT_H
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#define ENGINE_AUDIO_MIXER_INPUT_H
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#include <atomic>
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#include <memory>
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#include "base/closure.h"
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namespace eng {
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class AudioBus;
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class AudioMixer;
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// An audio input stream that gets mixed and rendered to the audio sink. Handles
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// playback and volume control.
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struct MixerInput : public std::enable_shared_from_this<MixerInput> {
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enum Flags { kLoop = 1, kStopped = 2, kSimulateStereo = 4 };
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~MixerInput();
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static std::shared_ptr<MixerInput> Create();
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// Set AudioBus for playback. If this MixerInput is already streaming, keeps
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// it as pending and sets once playback ends.
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void SetAudioBus(std::shared_ptr<AudioBus> bus);
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// Starts playback. Remembers last stream position. Resets the stream position
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// if restart is true.
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void Play(AudioMixer* mixer, bool restart);
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// Stops playback. Does not reset stream position.
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void Stop();
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void SetLoop(bool loop);
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// Simulate stereo effect slightly delays one channel.
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void SetSimulateStereo(bool simulate);
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// Vary basic resampling for sound variations.
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void SetResampleStep(size_t value);
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// Set the current volume, max volume and volume increment steps.
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void SetAmplitude(float value);
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void SetMaxAmplitude(float value);
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void SetAmplitudeInc(float value);
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// Set a callback to be called once playback ends.
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void SetEndCallback(base::Closure cb);
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// Active AudioBus.
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std::shared_ptr<AudioBus> audio_bus;
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// AudioBus to be set as active once playback ends.
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std::shared_ptr<AudioBus> pending_audio_bus;
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// Stream position.
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size_t src_index = 0;
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size_t accumulator = 0;
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// Accessed by main thread only.
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bool streaming = false;
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base::Closure end_cb;
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base::Closure restart_cb;
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// Accessed by main thread and audio thread.
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std::atomic<unsigned> flags{0};
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std::atomic<size_t> step{100};
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std::atomic<float> amplitude{1.0f};
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std::atomic<float> amplitude_inc{0};
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std::atomic<float> max_amplitude{1.0f};
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// Accessed by audio thread and decoding worker thread.
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std::atomic<bool> streaming_in_progress{false};
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private:
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MixerInput();
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};
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} // namespace eng
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#endif // ENGINE_AUDIO_MIXER_INPUT_H
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