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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.ex.variablespeed;
     18 
     19 import android.media.AudioManager;
     20 
     21 import javax.annotation.concurrent.Immutable;
     22 import javax.annotation.concurrent.NotThreadSafe;
     23 
     24 /**
     25  * Encapsulates the parameters required to configure the audio engine.
     26  * <p>
     27  * You should not need to use this class directly, it exists for the benefit of
     28  * this package and the classes contained therein.
     29  */
     30 @Immutable
     31 /*package*/ final class EngineParameters {
     32     private final int mTargetFrames;
     33     private final int mMaxPlayBufferCount;
     34     private final float mWindowDuration;
     35     private final float mWindowOverlapDuration;
     36     private final float mInitialRate;
     37     private final int mDecodeBufferInitialSize;
     38     private final int mDecodeBufferMaxSize;
     39     private final int mStartPositionMillis;
     40     private final int mAudioStreamType;
     41 
     42     public int getTargetFrames() {
     43         return mTargetFrames;
     44     }
     45 
     46     public int getMaxPlayBufferCount() {
     47         return mMaxPlayBufferCount;
     48     }
     49 
     50     public float getWindowDuration() {
     51         return mWindowDuration;
     52     }
     53 
     54     public float getWindowOverlapDuration() {
     55         return mWindowOverlapDuration;
     56     }
     57 
     58     public float getInitialRate() {
     59         return mInitialRate;
     60     }
     61 
     62     public int getDecodeBufferInitialSize() {
     63         return mDecodeBufferInitialSize;
     64     }
     65 
     66     public int getDecodeBufferMaxSize() {
     67         return mDecodeBufferMaxSize;
     68     }
     69 
     70     public int getStartPositionMillis() {
     71         return mStartPositionMillis;
     72     }
     73 
     74     public int getAudioStreamType() {
     75         return mAudioStreamType;
     76     }
     77 
     78     private EngineParameters(int targetFrames, int maxPlayBufferCount, float windowDuration,
     79             float windowOverlapDuration, float initialRate, int decodeBufferInitialSize,
     80             int decodeBufferMaxSize, int startPositionMillis, int audioStreamType) {
     81         mTargetFrames = targetFrames;
     82         mMaxPlayBufferCount = maxPlayBufferCount;
     83         mWindowDuration = windowDuration;
     84         mWindowOverlapDuration = windowOverlapDuration;
     85         mInitialRate = initialRate;
     86         mDecodeBufferInitialSize = decodeBufferInitialSize;
     87         mDecodeBufferMaxSize = decodeBufferMaxSize;
     88         mStartPositionMillis = startPositionMillis;
     89         mAudioStreamType = audioStreamType;
     90     }
     91 
     92     /**
     93      * We use the builder pattern to construct an {@link EngineParameters}
     94      * object.
     95      * <p>
     96      * This class is not thread safe, you should confine its use to one thread
     97      * or provide your own synchronization.
     98      */
     99     @NotThreadSafe
    100     public static class Builder {
    101         private int mTargetFrames = 1000;
    102         private int mMaxPlayBufferCount = 2;
    103         private float mWindowDuration = 0.08f;
    104         private float mWindowOverlapDuration = 0.008f;
    105         private float mInitialRate = 1.0f;
    106         private int mDecodeBufferInitialSize = 5 * 1024;
    107         private int mDecodeBufferMaxSize = 20 * 1024;
    108         private int mStartPositionMillis = 0;
    109         private int mAudioStreamType = AudioManager.STREAM_MUSIC;
    110 
    111         public EngineParameters build() {
    112             return new EngineParameters(mTargetFrames, mMaxPlayBufferCount,
    113                     mWindowDuration, mWindowOverlapDuration, mInitialRate,
    114                     mDecodeBufferInitialSize, mDecodeBufferMaxSize, mStartPositionMillis,
    115                     mAudioStreamType);
    116         }
    117 
    118         public Builder maxPlayBufferCount(int maxPlayBufferCount) {
    119             mMaxPlayBufferCount = maxPlayBufferCount;
    120             return this;
    121         }
    122 
    123         public Builder windowDuration(int windowDuration) {
    124             mWindowDuration = windowDuration;
    125             return this;
    126         }
    127 
    128         public Builder windowOverlapDuration(int windowOverlapDuration) {
    129             mWindowOverlapDuration = windowOverlapDuration;
    130             return this;
    131         }
    132 
    133         public Builder initialRate(float initialRate) {
    134             mInitialRate = initialRate;
    135             return this;
    136         }
    137 
    138         public Builder decodeBufferInitialSize(int decodeBufferInitialSize) {
    139             mDecodeBufferInitialSize = decodeBufferInitialSize;
    140             return this;
    141         }
    142 
    143         public Builder decodeBufferMaxSize(int decodeBufferMaxSize) {
    144             mDecodeBufferMaxSize = decodeBufferMaxSize;
    145             return this;
    146         }
    147 
    148         public Builder startPositionMillis(int startPositionMillis) {
    149             mStartPositionMillis = startPositionMillis;
    150             return this;
    151         }
    152 
    153         public Builder audioStreamType(int audioStreamType) {
    154             mAudioStreamType = audioStreamType;
    155             return this;
    156         }
    157     }
    158 }
    159