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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.metadata.emsg;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
/**
* Encodes data that can be decoded by {@link EventMessageDecoder}. This class isn't thread safe.
*/
public final class EventMessageEncoder {
private final ByteArrayOutputStream byteArrayOutputStream;
private final DataOutputStream dataOutputStream;
public EventMessageEncoder() {
byteArrayOutputStream = new ByteArrayOutputStream(512);
dataOutputStream = new DataOutputStream(byteArrayOutputStream);
}
/**
* Encodes an {@link EventMessage} to a byte array that can be decoded by {@link
* EventMessageDecoder}.
*
* @param eventMessage The event message to be encoded.
* @return The serialized byte array.
*/
public byte[] encode(EventMessage eventMessage) {
byteArrayOutputStream.reset();
try {
writeNullTerminatedString(dataOutputStream, eventMessage.schemeIdUri);
String nonNullValue = eventMessage.value != null ? eventMessage.value : "";
writeNullTerminatedString(dataOutputStream, nonNullValue);
writeUnsignedInt(dataOutputStream, eventMessage.durationMs);
writeUnsignedInt(dataOutputStream, eventMessage.id);
dataOutputStream.write(eventMessage.messageData);
dataOutputStream.flush();
return byteArrayOutputStream.toByteArray();
} catch (IOException e) {
// Should never happen.
throw new RuntimeException(e);
}
}
private static void writeNullTerminatedString(DataOutputStream dataOutputStream, String value)
throws IOException {
dataOutputStream.writeBytes(value);
dataOutputStream.writeByte(0);
}
private static void writeUnsignedInt(DataOutputStream outputStream, long value)
throws IOException {
outputStream.writeByte((int) (value >>> 24) & 0xFF);
outputStream.writeByte((int) (value >>> 16) & 0xFF);
outputStream.writeByte((int) (value >>> 8) & 0xFF);
outputStream.writeByte((int) value & 0xFF);
}
}
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