server/src/MediaPlayer.kt

/*
 * Copyright (C) 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.pandora

import android.content.Context
import android.content.Intent
import android.media.*
import android.support.v4.media.session.PlaybackStateCompat.SHUFFLE_MODE_ALL
import android.support.v4.media.session.PlaybackStateCompat.SHUFFLE_MODE_GROUP
import android.support.v4.media.session.PlaybackStateCompat.SHUFFLE_MODE_NONE
import com.google.protobuf.Empty
import io.grpc.stub.StreamObserver
import java.io.Closeable
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.cancel
import pandora.MediaPlayerGrpc.MediaPlayerImplBase
import pandora.MediaPlayerProto.*
import pandora.MediaPlayerProto.GetShuffleModeResponse
import pandora.MediaPlayerProto.SetShuffleModeRequest
import pandora.MediaPlayerProto.ShuffleMode

@kotlinx.coroutines.ExperimentalCoroutinesApi
class MediaPlayer(val context: Context) : MediaPlayerImplBase(), Closeable {
    private val TAG = "PandoraMediaPlayer"

    private val scope: CoroutineScope

    init {
        // Init the CoroutineScope
        scope = CoroutineScope(Dispatchers.Default.limitedParallelism(1))
        if (!MediaPlayerBrowserService.isInitialized()) {
            context.startService(Intent(context, MediaPlayerBrowserService::class.java))
        }
    }

    override fun play(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.play()
            Empty.getDefaultInstance()
        }
    }

    override fun playUpdated(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.playUpdated()
            Empty.getDefaultInstance()
        }
    }

    override fun stop(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.stop()
            Empty.getDefaultInstance()
        }
    }

    override fun pause(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.pause()
            Empty.getDefaultInstance()
        }
    }

    override fun rewind(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.rewind()
            Empty.getDefaultInstance()
        }
    }

    override fun fastForward(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.fastForward()
            Empty.getDefaultInstance()
        }
    }

    override fun forward(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.forward()
            Empty.getDefaultInstance()
        }
    }

    override fun backward(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.backward()
            Empty.getDefaultInstance()
        }
    }

    override fun setLargeMetadata(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.setLargeMetadata()
            Empty.getDefaultInstance()
        }
    }

    override fun updateQueue(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.updateQueue()
            Empty.getDefaultInstance()
        }
    }

    override fun resetQueue(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.resetQueue()
            Empty.getDefaultInstance()
        }
    }

    override fun getShuffleMode(
        request: Empty,
        responseObserver: StreamObserver<GetShuffleModeResponse>
    ) {
        grpcUnary(scope, responseObserver) {
            val mode: Int = MediaPlayerBrowserService.instance.getShuffleMode()
            val shuffleMode =
                when (mode) {
                    SHUFFLE_MODE_NONE -> ShuffleMode.NONE
                    SHUFFLE_MODE_ALL -> ShuffleMode.ALL
                    SHUFFLE_MODE_GROUP -> ShuffleMode.GROUP
                    else -> ShuffleMode.NONE
                }
            GetShuffleModeResponse.newBuilder().setMode(shuffleMode).build()
        }
    }

    override fun setShuffleMode(
        request: SetShuffleModeRequest,
        responseObserver: StreamObserver<Empty>
    ) {
        grpcUnary(scope, responseObserver) {
            when (request.mode!!) {
                ShuffleMode.NONE ->
                    MediaPlayerBrowserService.instance.setShuffleMode(SHUFFLE_MODE_NONE)
                ShuffleMode.ALL ->
                    MediaPlayerBrowserService.instance.setShuffleMode(SHUFFLE_MODE_ALL)
                ShuffleMode.GROUP ->
                    MediaPlayerBrowserService.instance.setShuffleMode(SHUFFLE_MODE_GROUP)
                else -> MediaPlayerBrowserService.instance.setShuffleMode(SHUFFLE_MODE_NONE)
            }
            Empty.getDefaultInstance()
        }
    }

    override fun startTestPlayback(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.startTestPlayback()
            Empty.getDefaultInstance()
        }
    }

    override fun stopTestPlayback(request: Empty, responseObserver: StreamObserver<Empty>) {
        grpcUnary<Empty>(scope, responseObserver) {
            MediaPlayerBrowserService.instance.stopTestPlayback()
            Empty.getDefaultInstance()
        }
    }

    override fun close() {
        // Deinit the CoroutineScope
        scope.cancel()
    }
}