69 lines
1.9 KiB
Java
69 lines
1.9 KiB
Java
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.media;
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import android.os.ParcelFileDescriptor;
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import android.system.ErrnoException;
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import android.system.Os;
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import android.system.OsConstants;
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import android.util.Log;
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import java.io.FileDescriptor;
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import java.io.IOException;
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/**
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* A DataSourceCallback that is backed by a ParcelFileDescriptor.
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*/
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class ProxyDataSourceCallback extends DataSourceCallback {
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private static final String TAG = "TestDataSourceCallback";
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ParcelFileDescriptor mPFD;
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FileDescriptor mFD;
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ProxyDataSourceCallback(ParcelFileDescriptor pfd) throws IOException {
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mPFD = pfd.dup();
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mFD = mPFD.getFileDescriptor();
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}
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@Override
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public synchronized int readAt(long position, byte[] buffer, int offset, int size)
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throws IOException {
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try {
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Os.lseek(mFD, position, OsConstants.SEEK_SET);
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int ret = Os.read(mFD, buffer, offset, size);
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return (ret == 0) ? END_OF_STREAM : ret;
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} catch (ErrnoException e) {
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throw new IOException(e);
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}
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}
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@Override
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public synchronized long getSize() throws IOException {
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return mPFD.getStatSize();
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}
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@Override
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public synchronized void close() {
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try {
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mPFD.close();
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} catch (IOException e) {
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Log.e(TAG, "Failed to close the PFD.", e);
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}
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}
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}
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