mirror of https://github.com/auygun/kaliber.git
111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
#ifndef ENGINE_AUDIO_MIXER_INPUT_H
|
|
#define ENGINE_AUDIO_MIXER_INPUT_H
|
|
|
|
#include <atomic>
|
|
#include <memory>
|
|
|
|
#include "base/closure.h"
|
|
|
|
namespace eng {
|
|
|
|
class AudioBus;
|
|
class AudioMixer;
|
|
|
|
// An audio input stream that gets mixed and rendered to the audio sink. Handles
|
|
// playback and volume control.
|
|
class MixerInput : public std::enable_shared_from_this<MixerInput> {
|
|
public:
|
|
enum Flags { kLoop = 1, kStopped = 2, kSimulateStereo = 4 };
|
|
|
|
~MixerInput();
|
|
|
|
static std::shared_ptr<MixerInput> Create();
|
|
|
|
bool IsValid() const { return !!audio_bus_; }
|
|
|
|
// Set AudioBus for playback. If this MixerInput is already playing, keeps it
|
|
// as pending and sets once playback ends.
|
|
void SetAudioBus(std::shared_ptr<AudioBus> audio_bus);
|
|
|
|
// Starts playback. Remembers last stream position. Resets the stream position
|
|
// if restart is true.
|
|
void Play(AudioMixer* mixer, bool restart);
|
|
|
|
// Stops playback. Does not reset stream position.
|
|
void Stop();
|
|
|
|
// Set whether the playback should loop or not.
|
|
void SetLoop(bool loop);
|
|
|
|
// Simulate stereo effect slightly delays one channel.
|
|
void SetSimulateStereo(bool simulate);
|
|
|
|
// Vary basic resampling for sound variations.
|
|
void SetResampleStep(size_t value);
|
|
|
|
// Set the current volume, max volume and volume increment steps.
|
|
void SetAmplitude(float value);
|
|
void SetMaxAmplitude(float value);
|
|
void SetAmplitudeInc(float value);
|
|
|
|
// Set a callback to be called once playback ends.
|
|
void SetEndCallback(base::Closure cb);
|
|
|
|
// Getters
|
|
std::shared_ptr<AudioBus> GetAudioBus() const { return audio_bus_; }
|
|
unsigned GetFlags() const { return flags_.load(std::memory_order_relaxed); }
|
|
size_t GetStep() const { return step_.load(std::memory_order_relaxed); }
|
|
float GetAmplitude() const {
|
|
return amplitude_.load(std::memory_order_relaxed);
|
|
}
|
|
float GetAmplitudeInc() const {
|
|
return amplitude_inc_.load(std::memory_order_relaxed);
|
|
}
|
|
float GetMaxAmplitude() const {
|
|
return max_amplitude_.load(std::memory_order_relaxed);
|
|
}
|
|
size_t GetSrcIndex() const { return src_index_; }
|
|
size_t GetAccumulator() const { return accumulator_; }
|
|
|
|
bool IsStreamingInProgress() const;
|
|
|
|
// Called by the mixer to save the last sample position.
|
|
void SetPosition(size_t index, int accumulator);
|
|
|
|
// Called by the mixer when more data is needed.
|
|
bool OnMoreData(bool loop);
|
|
|
|
// Called by the mixer when playback ends.
|
|
void OnRemovedFromMixer();
|
|
|
|
private:
|
|
// Active AudioBus.
|
|
std::shared_ptr<AudioBus> audio_bus_;
|
|
// AudioBus to be set as active once playback ends.
|
|
std::shared_ptr<AudioBus> pending_audio_bus_;
|
|
// Stream position.
|
|
size_t src_index_ = 0;
|
|
size_t accumulator_ = 0;
|
|
|
|
// Accessed by main thread only.
|
|
bool playing_ = false;
|
|
base::Closure end_cb_;
|
|
base::Closure restart_cb_;
|
|
|
|
// Accessed by main thread and audio thread.
|
|
std::atomic<unsigned> flags_{0};
|
|
std::atomic<size_t> step_{100};
|
|
std::atomic<float> amplitude_{1.0f};
|
|
std::atomic<float> amplitude_inc_{0};
|
|
std::atomic<float> max_amplitude_{1.0f};
|
|
|
|
// Accessed by audio thread and decoding worker thread.
|
|
std::atomic<bool> streaming_in_progress_{false};
|
|
|
|
MixerInput();
|
|
};
|
|
|
|
} // namespace eng
|
|
|
|
#endif // ENGINE_AUDIO_MIXER_INPUT_H
|