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/*
* 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/KeyedVector.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: CEPT: 425Hz, continuous
FIRST_SUP_TONE = TONE_SUP_DIAL,
TONE_SUP_BUSY, // Busy tone, CEPT: 425Hz, 500ms ON, 500ms OFF...
TONE_SUP_CONGESTION, // Congestion tone CEPT, JAPAN: 425Hz, 200ms ON, 200ms OFF...
TONE_SUP_RADIO_ACK, // Radio path acknowlegment, CEPT, ANSI: 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 CEPT,JAPAN: 425Hz, 200ms ON, 600ms OFF, 200ms ON, 3s OFF...
TONE_SUP_RINGTONE, // Ring Tone CEPT, JAPAN: 425Hz, 1s ON, 4s OFF...
LAST_SUP_TONE = TONE_SUP_RINGTONE,
// 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
// Additional call supervisory tones: specified by IS-95 only
TONE_SUP_INTERCEPT, // Intercept tone: alternating 440 Hz and 620 Hz tones, each on for 250 ms.
TONE_SUP_INTERCEPT_ABBREV, // Abbreviated intercept: intercept tone limited to 4 seconds
TONE_SUP_CONGESTION_ABBREV, // Abbreviated congestion: congestion tone limited to 4 seconds
TONE_SUP_CONFIRM, // Confirm tone: a 350 Hz tone added to a 440 Hz tone repeated 3 times in a 100 ms on, 100 ms off cycle.
TONE_SUP_PIP, // Pip tone: four bursts of 480 Hz tone (0.1 s on, 0.1 s off).
NUM_TONES,
NUM_SUP_TONES = LAST_SUP_TONE-FIRST_SUP_TONE+1
};
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 //
};
// Region specific tones.
// These supervisory tones are different depending on the region (USA/CANADA, JAPAN, rest of the world).
// When a tone in the range [FIRST_SUP_TONE, LAST_SUP_TONE] is requested, the region is determined
// from system property gsm.operator.iso-country and the proper tone descriptor is selected with the
// help of sToneMappingTable[]
enum regional_tone_type {
// ANSI supervisory tones
TONE_ANSI_DIAL = NUM_TONES, // Dial tone: a continuous 350 Hz + 440 Hz tone.
TONE_ANSI_BUSY, // Busy tone on: a 480 Hz + 620 Hz tone repeated in a 500 ms on, 500 ms off cycle.
TONE_ANSI_CONGESTION, // Network congestion (reorder) tone on: a 480 Hz + 620 Hz tone repeated in a 250 ms on, 250 ms off cycle.
TONE_ANSI_CALL_WAITING, // Call waiting tone on: 440 Hz, on for 300 ms, 9,7 s off followed by
// (440 Hz, on for 100 ms off for 100 ms, on for 100 ms, 9,7s off and repeated as necessary).
TONE_ANSI_RINGTONE, // Ring Tone: a 440 Hz + 480 Hz tone repeated in a 2 s on, 4 s off pattern.
// JAPAN Supervisory tones
TONE_JAPAN_DIAL, // Dial tone: 400Hz, continuous
TONE_JAPAN_BUSY, // Busy tone: 400Hz, 500ms ON, 500ms OFF...
TONE_JAPAN_RADIO_ACK, // Radio path acknowlegment: 400Hz, 1s ON, 2s OFF...
NUM_ALTERNATE_TONES
};
enum region {
ANSI,
JAPAN,
CEPT,
NUM_REGIONS
};
static const unsigned char sToneMappingTable[NUM_REGIONS-1][NUM_SUP_TONES];
static const unsigned int TONEGEN_MAX_WAVES = 3; // Maximun number of sine waves in a tone segment
static const unsigned int TONEGEN_MAX_SEGMENTS = 5; // Maximun number of segments in a tone descriptor
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[]:
// 1 for static tone descriptors: contains the frequencies of all individual waves making the multi-tone.
// 2 for active tone descritors: contains the indexes of the WaveGenerator objects in mWaveGens
// 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. Otherwise, tone sequence will be
// restarted from segment repeatSegment.
// - repeatSegment number of the first repeated segment when repeatCnt is not null
class ToneSegment {
public:
unsigned int duration;
unsigned short waveFreq[TONEGEN_MAX_WAVES+1];
};
class ToneDescriptor {
public:
ToneSegment segments[TONEGEN_MAX_SEGMENTS+1];
unsigned long repeatCnt;
unsigned long repeatSegment;
};
static const ToneDescriptor sToneDescriptors[];
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)
unsigned short mRegion;
const ToneDescriptor *mpToneDesc; // pointer to active tone descriptor
const ToneDescriptor *mpNewToneDesc; // pointer to next active tone descriptor
int mSamplingRate; // AudioFlinger 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
int mStreamType; // Audio stream used for output
unsigned int mProcessSize; // Size of audio blocks generated at a time by audioCallback() (in PCM frames).
bool initAudioTrack();
static void audioCallback(int event, void* user, void *info);
bool prepareWave();
unsigned int numWaves(unsigned int segmentIdx);
void clearWaveGens();
int getToneForRegion(int toneType);
// 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
};
KeyedVector<unsigned short, WaveGenerator *> mWaveGens; // list of active wave generators.
};
}
; // namespace android
#endif /*ANDROID_TONEGENERATOR_H_*/
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