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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 org.mozilla.thirdparty.com.google.android.exoplayer2.video;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.ParserException;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.NalUnitUtil;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableByteArray;
import java.util.Collections;
import java.util.List;
/**
* HEVC configuration data.
*/
public final class HevcConfig {
@Nullable public final List<byte[]> initializationData;
public final int nalUnitLengthFieldLength;
/**
* Parses HEVC configuration data.
*
* @param data A {@link ParsableByteArray}, whose position is set to the start of the HEVC
* configuration data to parse.
* @return A parsed representation of the HEVC configuration data.
* @throws ParserException If an error occurred parsing the data.
*/
public static HevcConfig parse(ParsableByteArray data) throws ParserException {
try {
data.skipBytes(21); // Skip to the NAL unit length size field.
int lengthSizeMinusOne = data.readUnsignedByte() & 0x03;
// Calculate the combined size of all VPS/SPS/PPS bitstreams.
int numberOfArrays = data.readUnsignedByte();
int csdLength = 0;
int csdStartPosition = data.getPosition();
for (int i = 0; i < numberOfArrays; i++) {
data.skipBytes(1); // completeness (1), nal_unit_type (7)
int numberOfNalUnits = data.readUnsignedShort();
for (int j = 0; j < numberOfNalUnits; j++) {
int nalUnitLength = data.readUnsignedShort();
csdLength += 4 + nalUnitLength; // Start code and NAL unit.
data.skipBytes(nalUnitLength);
}
}
// Concatenate the codec-specific data into a single buffer.
data.setPosition(csdStartPosition);
byte[] buffer = new byte[csdLength];
int bufferPosition = 0;
for (int i = 0; i < numberOfArrays; i++) {
data.skipBytes(1); // completeness (1), nal_unit_type (7)
int numberOfNalUnits = data.readUnsignedShort();
for (int j = 0; j < numberOfNalUnits; j++) {
int nalUnitLength = data.readUnsignedShort();
System.arraycopy(NalUnitUtil.NAL_START_CODE, 0, buffer, bufferPosition,
NalUnitUtil.NAL_START_CODE.length);
bufferPosition += NalUnitUtil.NAL_START_CODE.length;
System
.arraycopy(data.data, data.getPosition(), buffer, bufferPosition, nalUnitLength);
bufferPosition += nalUnitLength;
data.skipBytes(nalUnitLength);
}
}
List<byte[]> initializationData = csdLength == 0 ? null : Collections.singletonList(buffer);
return new HevcConfig(initializationData, lengthSizeMinusOne + 1);
} catch (ArrayIndexOutOfBoundsException e) {
throw new ParserException("Error parsing HEVC config", e);
}
}
private HevcConfig(@Nullable List<byte[]> initializationData, int nalUnitLengthFieldLength) {
this.initializationData = initializationData;
this.nalUnitLengthFieldLength = nalUnitLengthFieldLength;
}
}
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