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/*
* Copyright (C) 2017 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 org.mozilla.thirdparty.com.google.android.exoplayer2.offline;
import android.net.Uri;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.DataSpec;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.cache.Cache;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.cache.CacheDataSource;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.cache.CacheKeyFactory;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.cache.CacheUtil;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.PriorityTaskManager;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* A downloader for progressive media streams.
*
* <p>The downloader attempts to download the entire media bytes referenced by a {@link Uri} into a
* cache as defined by {@link DownloaderConstructorHelper}. Callers can use the constructor to
* specify a custom cache key for the downloaded bytes.
*
* <p>The downloader will avoid downloading already-downloaded media bytes.
*/
public final class ProgressiveDownloader implements Downloader {
private static final int BUFFER_SIZE_BYTES = 128 * 1024;
private final DataSpec dataSpec;
private final Cache cache;
private final CacheDataSource dataSource;
private final CacheKeyFactory cacheKeyFactory;
private final PriorityTaskManager priorityTaskManager;
private final AtomicBoolean isCanceled;
/**
* @param uri Uri of the data to be downloaded.
* @param customCacheKey A custom key that uniquely identifies the original stream. Used for cache
* indexing. May be null.
* @param constructorHelper A {@link DownloaderConstructorHelper} instance.
*/
public ProgressiveDownloader(
Uri uri, @Nullable String customCacheKey, DownloaderConstructorHelper constructorHelper) {
this.dataSpec =
new DataSpec(
uri,
/* absoluteStreamPosition= */ 0,
C.LENGTH_UNSET,
customCacheKey,
/* flags= */ DataSpec.FLAG_ALLOW_CACHE_FRAGMENTATION);
this.cache = constructorHelper.getCache();
this.dataSource = constructorHelper.createCacheDataSource();
this.cacheKeyFactory = constructorHelper.getCacheKeyFactory();
this.priorityTaskManager = constructorHelper.getPriorityTaskManager();
isCanceled = new AtomicBoolean();
}
@Override
public void download(@Nullable ProgressListener progressListener)
throws InterruptedException, IOException {
priorityTaskManager.add(C.PRIORITY_DOWNLOAD);
try {
CacheUtil.cache(
dataSpec,
cache,
cacheKeyFactory,
dataSource,
new byte[BUFFER_SIZE_BYTES],
priorityTaskManager,
C.PRIORITY_DOWNLOAD,
progressListener == null ? null : new ProgressForwarder(progressListener),
isCanceled,
/* enableEOFException= */ true);
} finally {
priorityTaskManager.remove(C.PRIORITY_DOWNLOAD);
}
}
@Override
public void cancel() {
isCanceled.set(true);
}
@Override
public void remove() {
CacheUtil.remove(dataSpec, cache, cacheKeyFactory);
}
private static final class ProgressForwarder implements CacheUtil.ProgressListener {
private final ProgressListener progessListener;
public ProgressForwarder(ProgressListener progressListener) {
this.progessListener = progressListener;
}
@Override
public void onProgress(long contentLength, long bytesCached, long newBytesCached) {
float percentDownloaded =
contentLength == C.LENGTH_UNSET || contentLength == 0
? C.PERCENTAGE_UNSET
: ((bytesCached * 100f) / contentLength);
progessListener.onProgress(contentLength, bytesCached, percentDownloaded);
}
}
}
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