64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
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/*
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* Copyright 2020 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#pragma once
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#include "include/core/SkData.h"
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#include <memory>
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class SK_API SkAudioPlayer {
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public:
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virtual ~SkAudioPlayer();
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// Returns null on failure (possibly unknown format?)
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static std::unique_ptr<SkAudioPlayer> Make(sk_sp<SkData>);
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// in seconds
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double duration() const { return this->onGetDuration(); }
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double time() const { return this->onGetTime(); } // 0...duration()
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double setTime(double); // returns actual time
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double normalizedTime() const { return this->time() / this->duration(); }
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double setNormalizedTime(double t);
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enum class State {
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kPlaying,
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kStopped,
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kPaused,
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};
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State state() const { return fState; }
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float volume() const { return fVolume; } // 0...1
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float rate() const { return fRate; } // multiplier (e.g. 1.0 is default)
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State setState(State); // returns actual State
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float setRate(float); // returns actual rate
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float setVolume(float); // returns actual volume
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void play() { this->setState(State::kPlaying); }
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void pause() { this->setState(State::kPaused); }
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void stop() { this->setState(State::kStopped); }
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bool isPlaying() const { return this->state() == State::kPlaying; }
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bool isPaused() const { return this->state() == State::kPaused; }
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bool isStopped() const { return this->state() == State::kStopped; }
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protected:
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SkAudioPlayer() {} // only called by subclasses
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virtual double onGetDuration() const = 0;
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virtual double onGetTime() const = 0;
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virtual double onSetTime(double) = 0;
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virtual State onSetState(State) = 0;
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virtual float onSetRate(float) = 0;
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virtual float onSetVolume(float) = 0;
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private:
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State fState = State::kStopped;
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float fRate = 1.0f;
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float fVolume = 1.0f;
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};
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