1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
* Copyright (C) 2008 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.
*/
#ifndef ANDROID_TONEGENERATOR_H_
#define ANDROID_TONEGENERATOR_H_
#include <utils/RefBase.h>
#include <utils/Vector.h>
#include <utils/threads.h>
#include <media/AudioSystem.h>
#include <media/AudioTrack.h>
namespace android {
class ToneGenerator {
public:
// List of all available tones
// This enum must be kept consistant with constants in ToneGenerator JAVA class
enum tone_type {
// DTMF tones ITU-T Recommendation Q.23
TONE_DTMF_0 = 0, // 0 key: 1336Hz, 941Hz
TONE_DTMF_1, // 1 key: 1209Hz, 697Hz
TONE_DTMF_2, // 2 key: 1336Hz, 697Hz
TONE_DTMF_3, // 3 key: 1477Hz, 697Hz
TONE_DTMF_4, // 4 key: 1209Hz, 770Hz
TONE_DTMF_5, // 5 key: 1336Hz, 770Hz
TONE_DTMF_6, // 6 key: 1477Hz, 770Hz
TONE_DTMF_7, // 7 key: 1209Hz, 852Hz
TONE_DTMF_8, // 8 key: 1336Hz, 852Hz
TONE_DTMF_9, // 9 key: 1477Hz, 852Hz
TONE_DTMF_S, // * key: 1209Hz, 941Hz
TONE_DTMF_P, // # key: 1477Hz, 941Hz
TONE_DTMF_A, // A key: 1633Hz, 697Hz
TONE_DTMF_B, // B key: 1633Hz, 770Hz
TONE_DTMF_C, // C key: 1633Hz, 852Hz
TONE_DTMF_D, // D key: 1633Hz, 941Hz
// Call supervisory tones: 3GPP TS 22.001 (CEPT)
TONE_SUP_DIAL, // Dial tone: 425Hz, continuous
TONE_SUP_BUSY, // Busy tone: 425Hz, 500ms ON, 500ms OFF...
TONE_SUP_CONGESTION, // Congestion tone: 425Hz, 200ms ON, 200ms OFF...
TONE_SUP_RADIO_ACK, // Radio path acknowlegment: 425Hz, 200ms ON
TONE_SUP_RADIO_NOTAVAIL, // Radio path not available: 425Hz, 200ms ON, 200 OFF 3 bursts
TONE_SUP_ERROR, // Error/Special info: 950Hz+1400Hz+1800Hz, 330ms ON, 1s OFF...
TONE_SUP_CALL_WAITING, // Call Waiting: 425Hz, 200ms ON, 600ms OFF, 200ms ON, 3s OFF...
TONE_SUP_RINGTONE, // Ring Tone: 425Hz, 1s ON, 4s OFF...
// Proprietary tones: 3GPP TS 31.111
TONE_PROP_BEEP, // General beep: 400Hz+1200Hz, 35ms ON
TONE_PROP_ACK, // Positive Acknowlgement: 1200Hz, 100ms ON, 100ms OFF 2 bursts
TONE_PROP_NACK, // Negative Acknowlgement: 300Hz+400Hz+500Hz, 400ms ON
TONE_PROP_PROMPT, // Prompt tone: 400Hz+1200Hz, 200ms ON
TONE_PROP_BEEP2, // General double beep: 400Hz+1200Hz, 35ms ON, 200ms OFF, 35ms on
NUM_TONES
};
ToneGenerator(int streamType, float volume);
~ToneGenerator();
bool startTone(int toneType);
void stopTone();
bool isInited() { return (mState == TONE_IDLE)?false:true;}
private:
enum tone_state {
TONE_IDLE, // ToneGenerator is being initialized or initialization failed
TONE_INIT, // ToneGenerator has been successfully initialized and is not playing
TONE_STARTING, // ToneGenerator is starting playing
TONE_PLAYING, // ToneGenerator is playing
TONE_STOPPING, // ToneGenerator is stoping
TONE_RESTARTING //
};
static const unsigned int NUM_PCM_BUFFERS = 2; // number of pcm buffers of audio track
static const unsigned int TONEGEN_MAX_WAVES = 3;
static const unsigned int TONEGEN_MAX_SEGMENTS = 4; // Maximun number of elenemts in
static const unsigned int TONEGEN_INF = 0xFFFFFFFF; // Represents infinite time duration
static const float TONEGEN_GAIN = 0.9; // Default gain passed to WaveGenerator().
// ToneDescriptor class contains all parameters needed to generate a tone:
// - The array waveFreq[] contains the frequencies of all individual waves making the multi-tone.
// The number of sine waves varies from 1 to TONEGEN_MAX_WAVES.
// The first null value indicates that no more waves are needed.
// - The array segments[] is used to generate the tone pulses. A segment is a period of time
// during which the tone is ON or OFF. Segments with even index (starting from 0)
// correspond to tone ON state and segments with odd index to OFF state.
// The data stored in segments[] is the duration of the corresponding period in ms.
// The first segment encountered with a 0 duration indicates that no more segment follows.
// - repeatCnt indicates the number of times the sequence described by segments[] array must be repeated.
// When the tone generator encounters the first 0 duration segment, it will compare repeatCnt to mCurCount.
// If mCurCount > repeatCnt, the tone is stopped automatically.
class ToneDescriptor {
public:
unsigned short waveFreq[TONEGEN_MAX_WAVES+1];
unsigned long segments[TONEGEN_MAX_SEGMENTS+1];
unsigned long repeatCnt;
};
static const ToneDescriptor toneDescriptors[NUM_TONES];
unsigned int mTotalSmp; // Total number of audio samples played (gives current time)
unsigned int mNextSegSmp; // Position of next segment transition expressed in samples
// NOTE: because mTotalSmp, mNextSegSmp are stored on 32 bit, current design will operate properly
// only if tone duration is less than about 27 Hours(@44100Hz sampling rate). If this time is exceeded,
// no crash will occur but tone sequence will show a glitch.
unsigned short mCurSegment; // Current segment index in ToneDescriptor segments[]
unsigned short mCurCount; // Current sequence repeat count
volatile unsigned short mState; // ToneGenerator state (tone_state)
const ToneDescriptor *mpToneDesc; // pointer to active tone descriptor
const ToneDescriptor *mpNewToneDesc; // pointer to next active tone descriptor
unsigned int mSamplingRate; // Sampling rate
AudioTrack *mpAudioTrack; // Pointer to audio track used for playback
Mutex mLock; // Mutex to control concurent access to ToneGenerator object from audio callback and application API
Mutex mCbkCondLock; // Mutex associated to mWaitCbkCond
Condition mWaitCbkCond; // condition enabling interface to wait for audio callback completion after a change is requested
float mVolume; // Volume applied to audio track
static void audioCallback(void* user, const AudioTrack::Buffer& info);
bool prepareWave();
unsigned int numWaves();
void clearWaveGens();
// WaveGenerator generates a single sine wave
class WaveGenerator {
public:
enum gen_command {
WAVEGEN_START, // Start/restart wave from phase 0
WAVEGEN_CONT, // Continue wave from current phase
WAVEGEN_STOP // Stop wave on zero crossing
};
WaveGenerator(unsigned short samplingRate, unsigned short frequency,
float volume);
~WaveGenerator();
void getSamples(short *outBuffer, unsigned int count,
unsigned int command);
private:
static const short GEN_AMP = 32000; // amplitude of generator
static const short S_Q14 = 14; // shift for Q14
static const short S_Q15 = 15; // shift for Q15
short mA1_Q14; // Q14 coefficient
// delay line of full amplitude generator
short mS1, mS2; // delay line S2 oldest
short mS2_0; // saved value for reinitialisation
short mAmplitude_Q15; // Q15 amplitude
};
Vector<WaveGenerator *> mWaveGens; // list of active wave generators.
};
}
; // namespace android
#endif /*ANDROID_TONEGENERATOR_H_*/
|
