1/*
2 * Copyright (C) 2009 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
17package com.android.musicvis.vis3;
18
19import com.android.musicvis.GenericWaveRS;
20import com.android.musicvis.R;
21import com.android.musicvis.RenderScriptScene;
22import com.android.musicvis.AudioCapture;
23
24import android.graphics.Canvas;
25import android.graphics.Rect;
26import android.os.Handler;
27import android.renderscript.Allocation;
28import android.renderscript.Element;
29import android.renderscript.Mesh.Primitive;
30import android.renderscript.ProgramVertex;
31import android.renderscript.ScriptC;
32import android.renderscript.Type;
33import android.renderscript.Element.Builder;
34import android.util.Log;
35import android.view.SurfaceHolder;
36
37import java.util.TimeZone;
38
39class Visualization3RS extends GenericWaveRS {
40
41    private short [] mAnalyzer = new short[512];
42
43    float lastOffset;
44
45    Visualization3RS(int width, int height) {
46        super(width, height, R.drawable.ice);
47        lastOffset = 0;
48    }
49
50    @Override
51    public void setOffset(float xOffset, float yOffset, int xPixels, int yPixels) {
52        mWorldState.yRotation = (xOffset * 4) * 360;
53        updateWorldState();
54    }
55
56    @Override
57    public void start() {
58        if (mAudioCapture == null) {
59            mAudioCapture = new AudioCapture(AudioCapture.TYPE_FFT, 512);
60        }
61        super.start();
62    }
63
64    @Override
65    public void stop() {
66        super.stop();
67        if (mAudioCapture != null) {
68            mAudioCapture.release();
69            mAudioCapture = null;
70        }
71    }
72
73    @Override
74    public void update() {
75
76        int len = 0;
77        if (mAudioCapture != null) {
78            mVizData = mAudioCapture.getFormattedData(1, 1);
79            // the really high frequencies aren't that interesting for music,
80            // so just chop those off and use only the lower half of the spectrum
81            len = mVizData.length / 2;
82        }
83        if (len == 0) {
84            if (mWorldState.idle == 0) {
85                mWorldState.idle = 1;
86                updateWorldState();
87            }
88            return;
89        }
90
91        len /= 2; // the bins are comprised of 2 values each
92
93        if (len > mAnalyzer.length) len = mAnalyzer.length;
94
95        if (mWorldState.idle != 0) {
96            mWorldState.idle = 0;
97            updateWorldState();
98        }
99
100        for (int i = 1; i < len - 1; i++) {
101            int val1 = mVizData[i * 2];
102            int val2 = mVizData[i * 2 + 1];
103            int val = val1 * val1 + val2 * val2;
104            short newval = (short)(val * (i/16+1));
105            short oldval = mAnalyzer[i];
106            if (newval >= oldval - 800) {
107                // use new high value
108            } else {
109                newval = (short)(oldval - 800);
110            }
111            mAnalyzer[i] = newval;
112        }
113
114        // distribute the data over mWidth samples in the middle of the mPointData array
115        final int outlen = mPointData.length / 8;
116        final int width = mWidth > outlen ? outlen : mWidth;
117        final int skip = (outlen - width) / 2;
118
119        int srcidx = 0;
120        int cnt = 0;
121        for (int i = 0; i < width; i++) {
122            float val = mAnalyzer[srcidx] / 8;
123            if (val < 1f && val > -1f) val = 1;
124            mPointData[(i + skip) * 8 + 1] = val;
125            mPointData[(i + skip) * 8 + 5] = -val;
126            cnt += len;
127            if (cnt > width) {
128                srcidx++;
129                cnt -= width;
130            }
131        }
132        mPointAlloc.copyFromUnchecked(mPointData);
133    }
134
135}
136