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import android.media.AudioManager; | |
import android.media.MediaPlayer; | |
import android.util.Pair; | |
import org.jetbrains.annotations.NotNull; | |
import java.io.File; | |
import java.io.IOException; | |
import java.util.concurrent.TimeUnit; | |
import rx.Observable; | |
import rx.subscriptions.Subscriptions; | |
public class RxMediaPlayer { | |
public static @NotNull Observable<MediaPlayer> from(@NotNull File file) { | |
return Observable.create(subscriber -> { | |
final MediaPlayer player = create(); | |
try { | |
player.setDataSource(file.getAbsolutePath()); | |
subscriber.onNext(player); | |
subscriber.onCompleted(); | |
} catch (IOException e) { | |
subscriber.onError(e); | |
} | |
}); | |
} | |
public static @NotNull Observable<Pair<Integer, Integer>> play(@NotNull MediaPlayer mp) { | |
return prepare(mp).flatMap(RxMediaPlayer::stream); | |
} | |
static @NotNull MediaPlayer create() { | |
final MediaPlayer player = new MediaPlayer(); | |
player.setAudioStreamType(AudioManager.STREAM_MUSIC); | |
return player; | |
} | |
static @NotNull Observable<MediaPlayer> prepare(@NotNull MediaPlayer mp) { | |
return Observable.create(subscriber -> { | |
try { | |
mp.prepare(); | |
subscriber.onNext(mp); | |
subscriber.onCompleted(); | |
} catch (IOException e) { | |
mp.reset(); | |
mp.release(); | |
subscriber.onError(e); | |
} | |
}); | |
} | |
static @NotNull Observable<Pair<Integer, Integer>> stream(@NotNull MediaPlayer mp) { | |
return Observable.create(subscriber -> { | |
subscriber.add(Subscriptions.create(() -> { | |
if (mp.isPlaying()) { | |
mp.stop(); | |
} | |
mp.reset(); | |
mp.release(); | |
})); | |
mp.start(); | |
subscriber.add(ticks(mp) | |
.takeUntil(complete(mp)) | |
.subscribe(subscriber)); | |
}); | |
} | |
static @NotNull Observable<Pair<Integer, Integer>> ticks(@NotNull MediaPlayer mp) { | |
return Observable.interval(16, TimeUnit.MILLISECONDS) | |
.map(y -> Pair.create(mp.getCurrentPosition(), mp.getDuration())); | |
} | |
static @NotNull Observable<MediaPlayer> complete(@NotNull MediaPlayer player) { | |
return Observable.create(subscriber -> player.setOnCompletionListener(mp -> { | |
subscriber.onNext(mp); | |
subscriber.onCompleted(); | |
})); | |
} | |
} |
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