| /* |
| * Copyright (C) 2019 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.car.radio.service; |
| |
| import android.os.RemoteException; |
| |
| import androidx.annotation.GuardedBy; |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| import androidx.lifecycle.LiveData; |
| |
| import com.android.car.broadcastradio.support.Program; |
| import com.android.car.radio.SkipMode; |
| import com.android.car.radio.util.Log; |
| |
| import java.io.PrintWriter; |
| import java.util.List; |
| |
| /** |
| * Helper class used to keep track of which station should be toggled next (or prev), based on |
| * {@link SkipMode}. |
| */ |
| final class SkipController { |
| |
| private static final String TAG = SkipController.class.getSimpleName(); |
| |
| private final Object mLock = new Object(); |
| |
| private final IRadioAppService.Stub mService; |
| |
| @GuardedBy("mlock") |
| private List<Program> mFavorites; |
| |
| @GuardedBy("mlock") |
| private int mCurrentIndex; |
| |
| @GuardedBy("mlock") |
| private SkipMode mSkipMode; |
| |
| SkipController(@NonNull IRadioAppService.Stub service, |
| @NonNull LiveData<List<Program>> favorites, @NonNull SkipMode initialMode) { |
| mService = service; |
| mSkipMode = initialMode; |
| |
| Log.v(TAG, "Initial mode: %s", initialMode); |
| |
| // TODO(b/137647889): not really working because they're changed in a different process. |
| // As such, the changes are only effective after the radio service restarts - that's |
| // not ideal, but it's better than nothing :-) |
| // Long term, we need to provide a way to sync them... |
| favorites.observeForever(this::onFavoritesChanged); |
| } |
| |
| void setSkipMode(@NonNull SkipMode mode) { |
| Log.d(TAG, "setSkipMode(%s)", mode); |
| synchronized (mLock) { |
| this.mSkipMode = mode; |
| } |
| } |
| |
| void skip(boolean forward, ITuneCallback callback) throws RemoteException { |
| Log.d(TAG, "skip(%s, %s)", mSkipMode, forward); |
| |
| Program program = null; |
| synchronized (mLock) { |
| if (mSkipMode == SkipMode.FAVORITES || mSkipMode == SkipMode.BROWSE) { |
| program = getFavoriteLocked(forward); |
| if (program == null) { |
| Log.d(TAG, "skip(%s): no favorites, seeking instead", forward); |
| } |
| } |
| } |
| |
| if (program != null) { |
| Log.d(TAG, "skip(%s): changing to %s", forward, program.getName()); |
| mService.tune(program.getSelector(), callback); |
| } else { |
| mService.seek(forward, callback); |
| } |
| } |
| |
| private void onFavoritesChanged(List<Program> favorites) { |
| Log.v(TAG, "onFavoritesChanged(): %s", favorites); |
| synchronized (this) { |
| mFavorites = favorites; |
| // TODO(b/137647889): try to preserve currentIndex, either pointing to the same station, |
| // or the closest one |
| mCurrentIndex = 0; |
| } |
| } |
| |
| @Nullable |
| private Program getFavoriteLocked(boolean next) { |
| if (mFavorites == null || mFavorites.isEmpty()) return null; |
| |
| // TODO(b/137647889): to keep it simple, we're only interacting through explicit calls |
| // to prev/next, but ideally it should also take in account the current station. |
| // For example, say the favorites are 4, 8, 15, 16, 23, 42 and user skipped from |
| // 15 to 16 but later manually tuned to 5. In this case, if the user skips again we'll |
| // return 23 (next index), but ideally it would be 8 (i.e, next favorite whose value |
| // is higher than 5) |
| if (next) { |
| mCurrentIndex++; |
| if (mCurrentIndex >= mFavorites.size()) { |
| mCurrentIndex = 0; |
| } |
| } else { |
| mCurrentIndex--; |
| if (mCurrentIndex < 0) { |
| mCurrentIndex = mFavorites.size() - 1; |
| } |
| } |
| Program program = mFavorites.get(mCurrentIndex); |
| Log.v(TAG, "getting favorite #" + mCurrentIndex + ": " + program.getName()); |
| return program; |
| } |
| |
| void dump(@NonNull PrintWriter pw, @NonNull String prefix) { |
| synchronized (mLock) { |
| pw.print(prefix); pw.print("mode: "); pw.println(mSkipMode); |
| pw.print(prefix); pw.print("current index: "); pw.println(mCurrentIndex); |
| if (mFavorites == null || mFavorites.isEmpty()) { |
| pw.print(prefix); pw.println("no favorites"); |
| return; |
| } |
| int size = mFavorites.size(); |
| pw.print(prefix); pw.print(size); pw.println(" favorites: "); |
| String prefix2 = prefix + " "; |
| for (int i = 0; i < size; i++) { |
| pw.print(prefix2); |
| pw.print(i); pw.print(": "); pw.print(mFavorites.get(i).getName()); |
| if (i == mCurrentIndex) { |
| pw.print(" (current)"); |
| } |
| pw.println(); |
| } |
| } |
| } |
| } |