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      1 /*
      2  * Copyright (C) 2010 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.example.nativeaudio;
     18 
     19 import android.app.Activity;
     20 import android.content.res.AssetManager;
     21 import android.os.Bundle;
     22 import android.view.View;
     23 import android.view.View.OnClickListener;
     24 import android.widget.Button;
     25 
     26 public class NativeAudio extends Activity {
     27 
     28     static final int CLIP_NONE = 0;
     29     static final int CLIP_HELLO = 1;
     30     static final int CLIP_ANDROID = 2;
     31     static final int CLIP_SAWTOOTH = 3;
     32     static final int CLIP_PLAYBACK = 4;
     33 
     34     static final String URI = "http://upload.wikimedia.org/wikipedia/commons/6/6d/Banana.ogg";
     35     static AssetManager assetManager;
     36 
     37     static boolean isPlayingAsset = false;
     38     static boolean isPlayingUri = false;
     39 
     40     /** Called when the activity is first created. */
     41     @Override
     42     protected void onCreate(Bundle icicle) {
     43         super.onCreate(icicle);
     44         setContentView(R.layout.main);
     45 
     46         assetManager = getAssets();
     47 
     48         // initialize native audio system
     49 
     50         createEngine();
     51         createBufferQueueAudioPlayer();
     52 
     53         // initialize button click handlers
     54 
     55         ((Button) findViewById(R.id.hello)).setOnClickListener(new OnClickListener() {
     56             public void onClick(View view) {
     57                 // ignore the return value
     58                 selectClip(CLIP_HELLO, 5);
     59             }
     60         });
     61 
     62         ((Button) findViewById(R.id.android)).setOnClickListener(new OnClickListener() {
     63             public void onClick(View view) {
     64                 // ignore the return value
     65                 selectClip(CLIP_ANDROID, 7);
     66             }
     67         });
     68 
     69         ((Button) findViewById(R.id.sawtooth)).setOnClickListener(new OnClickListener() {
     70             public void onClick(View view) {
     71                 // ignore the return value
     72                 selectClip(CLIP_SAWTOOTH, 1);
     73             }
     74         });
     75 
     76         ((Button) findViewById(R.id.reverb)).setOnClickListener(new OnClickListener() {
     77             boolean enabled = false;
     78             public void onClick(View view) {
     79                 enabled = !enabled;
     80                 if (!enableReverb(enabled)) {
     81                     enabled = !enabled;
     82                 }
     83             }
     84         });
     85 
     86         ((Button) findViewById(R.id.embedded_soundtrack)).setOnClickListener(new OnClickListener() {
     87             boolean created = false;
     88             public void onClick(View view) {
     89                 if (!created) {
     90                     created = createAssetAudioPlayer(assetManager, "background.mp3");
     91                 }
     92                 if (created) {
     93                     isPlayingAsset = !isPlayingAsset;
     94                     setPlayingAssetAudioPlayer(isPlayingAsset);
     95                 }
     96             }
     97         });
     98 
     99         ((Button) findViewById(R.id.uri_soundtrack)).setOnClickListener(new OnClickListener() {
    100             boolean created = false;
    101             public void onClick(View view) {
    102                 if (!created) {
    103                     created = createUriAudioPlayer(URI);
    104                 }
    105                 if (created) {
    106                     isPlayingUri = !isPlayingUri;
    107                     setPlayingUriAudioPlayer(isPlayingUri);
    108                 }
    109              }
    110         });
    111 
    112         ((Button) findViewById(R.id.record)).setOnClickListener(new OnClickListener() {
    113             boolean created = false;
    114             public void onClick(View view) {
    115                 if (!created) {
    116                     created = createAudioRecorder();
    117                 }
    118                 if (created) {
    119                     startRecording();
    120                 }
    121             }
    122         });
    123 
    124         ((Button) findViewById(R.id.playback)).setOnClickListener(new OnClickListener() {
    125             public void onClick(View view) {
    126                 // ignore the return value
    127                 selectClip(CLIP_PLAYBACK, 3);
    128             }
    129         });
    130 
    131     }
    132 
    133     /** Called when the activity is about to be destroyed. */
    134     @Override
    135     protected void onPause()
    136     {
    137         // turn off all audio
    138         selectClip(CLIP_NONE, 0);
    139         isPlayingAsset = false;
    140         setPlayingAssetAudioPlayer(false);
    141         isPlayingUri = false;
    142         setPlayingUriAudioPlayer(false);
    143         super.onPause();
    144     }
    145 
    146     /** Called when the activity is about to be destroyed. */
    147     @Override
    148     protected void onDestroy()
    149     {
    150         shutdown();
    151         super.onDestroy();
    152     }
    153 
    154     /** Native methods, implemented in jni folder */
    155     public static native void createEngine();
    156     public static native void createBufferQueueAudioPlayer();
    157     public static native boolean createAssetAudioPlayer(AssetManager assetManager, String filename);
    158     public static native void setPlayingAssetAudioPlayer(boolean isPlaying);
    159     public static native boolean createUriAudioPlayer(String uri);
    160     public static native void setPlayingUriAudioPlayer(boolean isPlaying);
    161     public static native boolean selectClip(int which, int count);
    162     public static native boolean enableReverb(boolean enabled);
    163     public static native boolean createAudioRecorder();
    164     public static native void startRecording();
    165     public static native void shutdown();
    166 
    167     /** Load jni .so on initialization */
    168     static {
    169          System.loadLibrary("native-audio-jni");
    170     }
    171 
    172 }
    173