Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * 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.
 */

import java.nio.ByteBuffer;

public class Main {
    /**
     * Returns the number of audio samples represented by the given TrueHD syncframe, or 0 if the
     * buffer is not the start of a syncframe.
     *
     * @param syncframe The bytes from which to read the syncframe. Must be at least {@link
     *     #TRUEHD_SYNCFRAME_PREFIX_LENGTH} bytes long.
     * @return The number of audio samples represented by the syncframe, or 0 if the buffer doesn't
     *     contain the start of a syncframe.
     */
    public static int parseTrueHdSyncframeAudioSampleCount(byte[] syncframe) {
        // TODO: Link to specification if available.
        // The syncword ends 0xBA for TrueHD or 0xBB for MLP.
        if (syncframe[4] != (byte) 0xF8 || syncframe[5] != (byte) 0x72 || syncframe[6] != (byte) 0x6F
                || (syncframe[7] & 0xFE) != 0xBA) {
            return 0;
        }
        boolean isMlp = (syncframe[7] & 0xFF) == 0xBB;
        return 40 << ((syncframe[isMlp ? 9 : 8] >> 4) & 0x07);
    }

    /**
     * Reads the number of audio samples represented by a TrueHD syncframe. The buffer's position is
     * not modified.
     *
     * @param buffer The {@link ByteBuffer} from which to read the syncframe.
     * @param offset The offset of the start of the syncframe relative to the buffer's position.
     * @return The number of audio samples represented by the syncframe.
     */
    public static int parseTrueHdSyncframeAudioSampleCount(ByteBuffer buffer, int offset) {
        // TODO: Link to specification if available.
        boolean isMlp = (buffer.get(buffer.position() + offset + 7) & 0xFF) == 0xBB;
        return 40 << ((buffer.get(buffer.position() + offset + (isMlp ? 9 : 8)) >> 4) & 0x07);
    }
}