1/*
2 * Copyright (C) 2015 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 org.drrickorang.loopback;
18
19
20/**
21 * This file stores constants that are used across multiple files.
22 */
23
24public class Constant {
25    public static final double TWO_PI = 2.0 * Math.PI;
26    public static final long   NANOS_PER_MILLI = 1000000;
27    public static final int    MILLIS_PER_SECOND = 1000;
28    public static final int    SECONDS_PER_HOUR = 3600;
29
30    public static final int LOOPBACK_PLUG_AUDIO_THREAD_TEST_TYPE_LATENCY = 222;
31    public static final int LOOPBACK_PLUG_AUDIO_THREAD_TEST_TYPE_BUFFER_PERIOD = 223;
32    public static final int LOOPBACK_PLUG_AUDIO_THREAD_TEST_TYPE_CALIBRATION = 224;
33
34    public static final int AUDIO_THREAD_TYPE_JAVA = 0;
35    public static final int AUDIO_THREAD_TYPE_NATIVE = 1;
36
37    public static final int BYTES_PER_SHORT = 2;
38    public static final int SHORTS_PER_INT = 2;
39    // FIXME Assumes 16-bit and mono, will not work for other bit depths or multi-channel.
40    public static final int BYTES_PER_FRAME = 2;    // bytes per sample
41
42    // prime numbers that don't overlap with FFT frequencies
43    public static final double PRIME_FREQUENCY_1 = 703.0;
44    public static final double PRIME_FREQUENCY_2 = 719.0;
45
46    // amplitude for ToneGeneration
47    public static final double SINE_WAVE_AMPLITUDE = 0.8;
48    public static final double TWO_SINE_WAVES_AMPLITUDE = 0.4;
49
50    // the number used to configured PipeShort/PipeByteBuffer
51    public static final int MAX_SHORTS = 65536;
52
53    // used to identify a variable is currently unknown
54    public static final int UNKNOWN = -1;
55
56    // used when joining a thread
57    public static final int JOIN_WAIT_TIME_MS = 1000;
58
59    // Loopback on Java thread test audio tone constants
60    public static final int LOOPBACK_SAMPLE_FRAMES = 300;
61    public static final double LOOPBACK_AMPLITUDE = 0.95;
62    public static final int LOOPBACK_FREQUENCY = 4000;
63
64    // Settings Activity and ADB constants
65    public static final int SAMPLING_RATE_MAX = 48000;
66    public static final int SAMPLING_RATE_MIN = 8000;
67    public static final int PLAYER_BUFFER_FRAMES_MAX = 8000;
68    public static final int PLAYER_BUFFER_FRAMES_MIN = 16;
69    public static final int RECORDER_BUFFER_FRAMES_MAX = 8000;
70    public static final int RECORDER_BUFFER_FRAMES_MIN = 16;
71    public static final int BUFFER_TEST_DURATION_SECONDS_MAX = 36000;
72    public static final int BUFFER_TEST_DURATION_SECONDS_MIN = 1;
73    public static final int BUFFER_TEST_WAVE_PLOT_DURATION_SECONDS_MAX = 120;
74    public static final int BUFFER_TEST_WAVE_PLOT_DURATION_SECONDS_MIN = 1;
75    public static final int MAX_NUM_LOAD_THREADS = 20;
76    public static final int MIN_NUM_LOAD_THREADS = 0;
77    public static final int MIN_NUM_CAPTURES = 1;
78    public static final int MAX_NUM_CAPTURES = 100;
79    public static final int DEFAULT_NUM_CAPTURES = 5;
80    public static final int MIN_IGNORE_FIRST_FRAMES = 0;
81    // impulse happens after 300 ms and shouldn't be ignored
82    public static final int MAX_IGNORE_FIRST_FRAMES = SAMPLING_RATE_MAX * 3 / 10;
83    public static final int DEFAULT_IGNORE_FIRST_FRAMES = 0;
84
85
86    // Controls size of pre allocated timestamp arrays
87    public static final int MAX_RECORDED_LATE_CALLBACKS_PER_SECOND = 2;
88    // Ignore first few buffer callback periods
89    public static final int BUFFER_PERIOD_DISCARD = 10;
90}
91