Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2014 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 {
    /**
     * The number of new samples per (E-)AC-3 audio block.
     */
    private static final int AUDIO_SAMPLES_PER_AUDIO_BLOCK = 256;
    /**
     * Number of audio blocks per E-AC-3 syncframe, indexed by numblkscod.
     */
    private static final int[] BLOCKS_PER_SYNCFRAME_BY_NUMBLKSCOD = new int[] { 1, 2, 3, 6 };

    /**
     * Returns the number of audio samples represented by the given E-AC-3 syncframe.
     *
     * @param data The syncframe to parse.
     * @return The number of audio samples represented by the syncframe.
     */
    public static int parseEAc3SyncframeAudioSampleCount(byte[] data) {
        // See ETSI TS 102 366 subsection E.1.2.2.
        return AUDIO_SAMPLES_PER_AUDIO_BLOCK * (((data[4] & 0xC0) >> 6) == 0x03 ? 6 // fscod
                : BLOCKS_PER_SYNCFRAME_BY_NUMBLKSCOD[(data[4] & 0x30) >> 4]);
    }

    /**
     * Like {@link #parseEAc3SyncframeAudioSampleCount(byte[])} but reads from a byte buffer. The
     * buffer position is not modified.
     *
     * @see #parseEAc3SyncframeAudioSampleCount(byte[])
     */
    public static int parseEAc3SyncframeAudioSampleCount(ByteBuffer buffer) {
        // See ETSI TS 102 366 subsection E.1.2.2.
        int fscod = (buffer.get(buffer.position() + 4) & 0xC0) >> 6;
        return AUDIO_SAMPLES_PER_AUDIO_BLOCK * (fscod == 0x03 ? 6
                : BLOCKS_PER_SYNCFRAME_BY_NUMBLKSCOD[(buffer.get(buffer.position() + 4) & 0x30) >> 4]);
    }
}