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Support raw resources inside the APK as a DataSource.

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-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=133013132
This commit is contained in:
benm 2016-09-13 10:05:40 -07:00 committed by Oliver Woodman
parent 76a05ce30f
commit 2ebabc54eb
1 changed files with 190 additions and 0 deletions
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190
library/src/main/java/com/google/android/exoplayer2/upstream/RawResourceDataSource.java Normal file
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/*
* Copyright (C) 2016 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.google.android.exoplayer2.upstream;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.content.res.Resources;
import android.net.Uri;
import android.text.TextUtils;
import com.google.android.exoplayer2.C;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* A {@link DataSource} for reading a raw resource inside the APK.
* <p>
* URIs supported by this source are of the form {@code rawresource:///resourceId}, where resourceId
* is the integer identifier of a raw resource.
*/
public final class RawResourceDataSource implements DataSource {
/**
* Thrown when an {@link IOException} is encountered reading from a raw resource.
*/
public static class RawResourceDataSourceException extends IOException {
public RawResourceDataSourceException(String message) {
super(message);
}
public RawResourceDataSourceException(IOException e) {
super(e);
}
}
/**
* The URI scheme used to identify raw resources. URIs used with this class must use this scheme.
*/
public static final String RAW_RESOURCE_SCHEME = "rawresource";
private final Resources resources;
private final TransferListener<? super RawResourceDataSource> listener;
private Uri uri;
private AssetFileDescriptor assetFileDescriptor;
private InputStream inputStream;
private long bytesRemaining;
private boolean opened;
/**
* @param context A context.
*/
public RawResourceDataSource(Context context) {
this(context, null);
}
/**
* @param context A context.
* @param listener An optional listener.
*/
public RawResourceDataSource(Context context,
TransferListener<? super RawResourceDataSource> listener) {
this.resources = context.getResources();
this.listener = listener;
}
@Override
public long open(DataSpec dataSpec) throws RawResourceDataSourceException {
try {
uri = dataSpec.uri;
if (!TextUtils.equals(RAW_RESOURCE_SCHEME, uri.getScheme())) {
throw new RawResourceDataSourceException("URI must use scheme " + RAW_RESOURCE_SCHEME);
}
int resourceId;
try {
resourceId = Integer.parseInt(uri.getLastPathSegment());
} catch (NumberFormatException e) {
throw new RawResourceDataSourceException("Resource identifier must be an integer.");
}
assetFileDescriptor = resources.openRawResourceFd(resourceId);
inputStream = new FileInputStream(assetFileDescriptor.getFileDescriptor());
inputStream.skip(assetFileDescriptor.getStartOffset());
long skipped = inputStream.skip(dataSpec.position);
if (skipped < dataSpec.position) {
// We expect the skip to be satisfied in full. If it isn't then we're probably trying to
// skip beyond the end of the data.
throw new EOFException();
}
if (dataSpec.length != C.LENGTH_UNSET) {
bytesRemaining = dataSpec.length;
} else {
bytesRemaining = inputStream.available();
if (bytesRemaining == 0) {
// FileInputStream.available() returns 0 if the remaining length cannot be determined, or
// if it's greater than Integer.MAX_VALUE. We don't know the true length in either case,
// so treat as unbounded.
bytesRemaining = C.LENGTH_UNSET;
}
}
} catch (IOException e) {
throw new RawResourceDataSourceException(e);
}
opened = true;
if (listener != null) {
listener.onTransferStart(this, dataSpec);
}
return bytesRemaining;
}
@Override
public int read(byte[] buffer, int offset, int readLength) throws RawResourceDataSourceException {
if (bytesRemaining == 0) {
return C.RESULT_END_OF_INPUT;
} else {
int bytesRead;
try {
int bytesToRead = bytesRemaining == C.LENGTH_UNSET ? readLength
: (int) Math.min(bytesRemaining, readLength);
bytesRead = inputStream.read(buffer, offset, bytesToRead);
} catch (IOException e) {
throw new RawResourceDataSourceException(e);
}
if (bytesRead > 0) {
if (bytesRemaining != C.LENGTH_UNSET) {
bytesRemaining -= bytesRead;
}
if (listener != null) {
listener.onBytesTransferred(this, bytesRead);
}
}
return bytesRead;
}
}
@Override
public Uri getUri() {
return uri;
}
@Override
public void close() throws RawResourceDataSourceException {
uri = null;
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {
throw new RawResourceDataSourceException(e);
} finally {
inputStream = null;
try {
if (assetFileDescriptor != null) {
assetFileDescriptor.close();
}
} catch (IOException e) {
throw new RawResourceDataSourceException(e);
} finally {
assetFileDescriptor = null;
if (opened) {
opened = false;
if (listener != null) {
listener.onTransferEnd(this);
}
}
}
}
}
}