SkAudioPlayer_sfml.cpp

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/*
* Copyright 2020 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
 
#include "include/core/SkData.h"
#include "modules/audioplayer/SkAudioPlayer.h"
 
#include <SFML/Audio.hpp>
 
namespace {
 
class SFMLAudioPlayer final : public SkAudioPlayer {
public:
    explicit SFMLAudioPlayer(sk_sp<SkData> data)
        : fData(std::move(data))
    {
        fMusic.openFromMemory(fData->data(), fData->size());
    }
 
private:
    double onGetDuration() const override {
        return static_cast<double>(fMusic.getDuration().asSeconds());
    }
 
    double onGetTime() const override {
        return static_cast<double>(fMusic.getPlayingOffset().asSeconds());
    }
 
    double onSetTime(double t) override {
        fMusic.setPlayingOffset(sf::seconds(static_cast<float>(t)));
 
        return this->onGetTime();
    }
 
    State onSetState(State state) override {
        switch (state) {
            case State::kPlaying: fMusic.play();  break;
            case State::kStopped: fMusic.stop();  break;
            case State::kPaused : fMusic.pause(); break;
        }
 
        return state;
    }
 
    float onSetRate(float r) override {
        fMusic.setPitch(r);
        return r;
    }
 
    float onSetVolume(float v) override {
        fMusic.setVolume(v * 100);
        return v;
    }
 
    const sk_sp<SkData> fData;
    sf::Music           fMusic;
};
 
} // namespace
 
std::unique_ptr<SkAudioPlayer> SkAudioPlayer::Make(sk_sp<SkData> src) {
    auto player = std::make_unique<SFMLAudioPlayer>(std::move(src));
 
    return player->duration() > 0 ? std::move(player) : nullptr;
}