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      1 /*
      2  * Copyright (C) 2008 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 #ifndef ANDROID_TONEGENERATOR_H_
     18 #define ANDROID_TONEGENERATOR_H_
     19 
     20 #include <utils/RefBase.h>
     21 #include <utils/KeyedVector.h>
     22 #include <utils/threads.h>
     23 #include <media/AudioSystem.h>
     24 #include <media/AudioTrack.h>
     25 
     26 namespace android {
     27 
     28 class ToneGenerator {
     29 public:
     30 
     31     // List of all available tones
     32     // This enum must be kept consistant with constants in ToneGenerator JAVA class
     33     enum tone_type {
     34         // DTMF tones  ITU-T Recommendation Q.23
     35         TONE_DTMF_0 = 0,  // 0 key: 1336Hz, 941Hz
     36         TONE_DTMF_1,  // 1 key: 1209Hz, 697Hz
     37         TONE_DTMF_2,  // 2 key: 1336Hz, 697Hz
     38         TONE_DTMF_3,  // 3 key: 1477Hz, 697Hz
     39         TONE_DTMF_4,  // 4 key: 1209Hz, 770Hz
     40         TONE_DTMF_5,  // 5 key: 1336Hz, 770Hz
     41         TONE_DTMF_6,  // 6 key: 1477Hz, 770Hz
     42         TONE_DTMF_7,  // 7 key: 1209Hz, 852Hz
     43         TONE_DTMF_8,  // 8 key: 1336Hz, 852Hz
     44         TONE_DTMF_9,  // 9 key: 1477Hz, 852Hz
     45         TONE_DTMF_S,  // * key: 1209Hz, 941Hz
     46         TONE_DTMF_P,  // # key: 1477Hz, 941Hz
     47         TONE_DTMF_A,  // A key: 1633Hz, 697Hz
     48         TONE_DTMF_B,  // B key: 1633Hz, 770Hz
     49         TONE_DTMF_C,  // C key: 1633Hz, 852Hz
     50         TONE_DTMF_D,  // D key: 1633Hz, 941Hz
     51         // Call supervisory tones:  3GPP TS 22.001 (CEPT)
     52         TONE_SUP_DIAL,  // Dial tone: CEPT: 425Hz, continuous
     53         FIRST_SUP_TONE = TONE_SUP_DIAL,
     54         TONE_SUP_BUSY,  // Busy tone, CEPT: 425Hz, 500ms ON, 500ms OFF...
     55         TONE_SUP_CONGESTION,  // Congestion tone CEPT, JAPAN: 425Hz, 200ms ON, 200ms OFF...
     56         TONE_SUP_RADIO_ACK,  // Radio path acknowlegment, CEPT, ANSI: 425Hz, 200ms ON
     57         TONE_SUP_RADIO_NOTAVAIL,  // Radio path not available: 425Hz, 200ms ON, 200 OFF 3 bursts
     58         TONE_SUP_ERROR,  // Error/Special info:  950Hz+1400Hz+1800Hz, 330ms ON, 1s OFF...
     59         TONE_SUP_CALL_WAITING,  // Call Waiting CEPT,JAPAN:  425Hz, 200ms ON, 600ms OFF, 200ms ON, 3s OFF...
     60         TONE_SUP_RINGTONE,  // Ring Tone CEPT, JAPAN:  425Hz, 1s ON, 4s OFF...
     61         LAST_SUP_TONE = TONE_SUP_RINGTONE,
     62         // Proprietary tones:  3GPP TS 31.111
     63         TONE_PROP_BEEP,  // General beep: 400Hz+1200Hz, 35ms ON
     64         TONE_PROP_ACK,  // Positive Acknowlgement: 1200Hz, 100ms ON, 100ms OFF 2 bursts
     65         TONE_PROP_NACK,  // Negative Acknowlgement: 300Hz+400Hz+500Hz, 400ms ON
     66         TONE_PROP_PROMPT,  // Prompt tone: 400Hz+1200Hz, 200ms ON
     67         TONE_PROP_BEEP2,  // General double beep: 400Hz+1200Hz, 35ms ON, 200ms OFF, 35ms on
     68         // Additional call supervisory tones: specified by IS-95 only
     69         TONE_SUP_INTERCEPT, // Intercept tone: alternating 440 Hz and 620 Hz tones, each on for 250 ms.
     70         TONE_SUP_INTERCEPT_ABBREV, // Abbreviated intercept: intercept tone limited to 4 seconds
     71         TONE_SUP_CONGESTION_ABBREV, // Abbreviated congestion: congestion tone limited to 4 seconds
     72         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.
     73         TONE_SUP_PIP, // Pip tone: four bursts of 480 Hz tone (0.1 s on, 0.1 s off).
     74 
     75         // CDMA Tones
     76         TONE_CDMA_DIAL_TONE_LITE,
     77         TONE_CDMA_NETWORK_USA_RINGBACK,
     78         TONE_CDMA_INTERCEPT,
     79         TONE_CDMA_ABBR_INTERCEPT,
     80         TONE_CDMA_REORDER,
     81         TONE_CDMA_ABBR_REORDER,
     82         TONE_CDMA_NETWORK_BUSY,
     83         TONE_CDMA_CONFIRM,
     84         TONE_CDMA_ANSWER,
     85         TONE_CDMA_NETWORK_CALLWAITING,
     86         TONE_CDMA_PIP,
     87 
     88         // ISDN
     89         TONE_CDMA_CALL_SIGNAL_ISDN_NORMAL,  // ISDN Alert Normal
     90         TONE_CDMA_CALL_SIGNAL_ISDN_INTERGROUP, // ISDN Intergroup
     91         TONE_CDMA_CALL_SIGNAL_ISDN_SP_PRI, // ISDN SP PRI
     92         TONE_CDMA_CALL_SIGNAL_ISDN_PAT3,  // ISDN Alert PAT3
     93         TONE_CDMA_CALL_SIGNAL_ISDN_PING_RING, // ISDN Alert PING RING
     94         TONE_CDMA_CALL_SIGNAL_ISDN_PAT5,  // ISDN Alert PAT5
     95         TONE_CDMA_CALL_SIGNAL_ISDN_PAT6,  // ISDN Alert PAT6
     96         TONE_CDMA_CALL_SIGNAL_ISDN_PAT7,  // ISDN Alert PAT7
     97         // ISDN end
     98 
     99         // IS54
    100         TONE_CDMA_HIGH_L,  // IS54 High Pitch Long
    101         TONE_CDMA_MED_L, // IS54 Med Pitch Long
    102         TONE_CDMA_LOW_L, // IS54 Low Pitch Long
    103         TONE_CDMA_HIGH_SS, // IS54 High Pitch Short Short
    104         TONE_CDMA_MED_SS, // IS54 Medium Pitch Short Short
    105         TONE_CDMA_LOW_SS, // IS54 Low Pitch Short Short
    106         TONE_CDMA_HIGH_SSL, // IS54 High Pitch Short Short Long
    107         TONE_CDMA_MED_SSL, // IS54 Medium  Pitch Short Short Long
    108         TONE_CDMA_LOW_SSL, // IS54 Low  Pitch Short Short Long
    109         TONE_CDMA_HIGH_SS_2, // IS54 High Pitch Short Short 2
    110         TONE_CDMA_MED_SS_2, // IS54 Med Pitch Short Short 2
    111         TONE_CDMA_LOW_SS_2, // IS54 Low  Pitch Short Short 2
    112         TONE_CDMA_HIGH_SLS, // IS54 High Pitch Short Long Short
    113         TONE_CDMA_MED_SLS, // IS54 Med Pitch Short Long Short
    114         TONE_CDMA_LOW_SLS, // IS54 Low Pitch Short Long Short
    115         TONE_CDMA_HIGH_S_X4, // IS54 High Pitch Short Short Short Short
    116         TONE_CDMA_MED_S_X4, // IS54 Med Pitch Short Short Short Short
    117         TONE_CDMA_LOW_S_X4, // IS54 Low Pitch Short Short Short Short
    118         TONE_CDMA_HIGH_PBX_L, // PBX High Pitch Long
    119         TONE_CDMA_MED_PBX_L, // PBX Med Pitch Long
    120         TONE_CDMA_LOW_PBX_L, // PBX Low  Pitch Long
    121         TONE_CDMA_HIGH_PBX_SS, // PBX High Short Short
    122         TONE_CDMA_MED_PBX_SS, // PBX Med Short Short
    123         TONE_CDMA_LOW_PBX_SS, // PBX Low  Short Short
    124         TONE_CDMA_HIGH_PBX_SSL, // PBX High Short Short Long
    125         TONE_CDMA_MED_PBX_SSL, // PBX Med Short Short Long
    126         TONE_CDMA_LOW_PBX_SSL,  // PBX Low Short Short Long
    127         TONE_CDMA_HIGH_PBX_SLS, // PBX High  SLS
    128         TONE_CDMA_MED_PBX_SLS,  // PBX Med SLS
    129         TONE_CDMA_LOW_PBX_SLS, // PBX Low SLS
    130         TONE_CDMA_HIGH_PBX_S_X4, // PBX High SSSS
    131         TONE_CDMA_MED_PBX_S_X4, // PBX Med SSSS
    132         TONE_CDMA_LOW_PBX_S_X4, // PBX LOW SSSS
    133         //IS54 end
    134         // proprietary
    135         TONE_CDMA_ALERT_NETWORK_LITE,
    136         TONE_CDMA_ALERT_AUTOREDIAL_LITE,
    137         TONE_CDMA_ONE_MIN_BEEP,
    138         TONE_CDMA_KEYPAD_VOLUME_KEY_LITE,
    139         TONE_CDMA_PRESSHOLDKEY_LITE,
    140         TONE_CDMA_ALERT_INCALL_LITE,
    141         TONE_CDMA_EMERGENCY_RINGBACK,
    142         TONE_CDMA_ALERT_CALL_GUARD,
    143         TONE_CDMA_SOFT_ERROR_LITE,
    144         TONE_CDMA_CALLDROP_LITE,
    145         // proprietary end
    146         TONE_CDMA_NETWORK_BUSY_ONE_SHOT,
    147         TONE_CDMA_ABBR_ALERT,
    148         TONE_CDMA_SIGNAL_OFF,
    149         //CDMA end
    150         NUM_TONES,
    151         NUM_SUP_TONES = LAST_SUP_TONE-FIRST_SUP_TONE+1
    152     };
    153 
    154     ToneGenerator(audio_stream_type_t streamType, float volume, bool threadCanCallJava = false);
    155     ~ToneGenerator();
    156 
    157     bool startTone(tone_type toneType, int durationMs = -1);
    158     void stopTone();
    159 
    160     bool isInited() { return (mState == TONE_IDLE)?false:true;}
    161 
    162     // returns the audio session this ToneGenerator belongs to or 0 if an error occured.
    163     int getSessionId() { return (mpAudioTrack == NULL) ? 0 : mpAudioTrack->getSessionId(); }
    164 
    165 private:
    166 
    167     enum tone_state {
    168         TONE_IDLE,  // ToneGenerator is being initialized or initialization failed
    169         TONE_INIT,  // ToneGenerator has been successfully initialized and is not playing
    170         TONE_STARTING,  // ToneGenerator is starting playing
    171         TONE_PLAYING,  // ToneGenerator is playing
    172         TONE_STOPPING,  // ToneGenerator is stoping
    173         TONE_STOPPED,  // ToneGenerator is stopped: the AudioTrack will be stopped
    174         TONE_RESTARTING  // A start request was received in active state (playing or stopping)
    175     };
    176 
    177 
    178     // Region specific tones.
    179     // These supervisory tones are different depending on the region (USA/CANADA, JAPAN, rest of the world).
    180     // When a tone in the range [FIRST_SUP_TONE, LAST_SUP_TONE] is requested, the region is determined
    181     // from system property gsm.operator.iso-country and the proper tone descriptor is selected with the
    182     // help of sToneMappingTable[]
    183     enum regional_tone_type {
    184         // ANSI supervisory tones
    185         TONE_ANSI_DIAL = NUM_TONES, // Dial tone: a continuous 350 Hz + 440 Hz tone.
    186         TONE_ANSI_BUSY,             // Busy tone on:  a 480 Hz + 620 Hz tone repeated in a 500 ms on, 500 ms off cycle.
    187         TONE_ANSI_CONGESTION,       // Network congestion (reorder) tone on:  a 480 Hz + 620 Hz tone repeated in a 250 ms on, 250 ms off cycle.
    188         TONE_ANSI_CALL_WAITING,     // Call waiting tone on: 440 Hz, on for 300 ms, 9,7 s off followed by
    189                                     // (440 Hz, on for 100 ms off for 100 ms, on for 100 ms, 9,7s off and repeated as necessary).
    190         TONE_ANSI_RINGTONE,         // Ring Tone:  a 440 Hz + 480 Hz tone repeated in a 2 s on, 4 s off pattern.
    191         // JAPAN Supervisory tones
    192         TONE_JAPAN_DIAL,            // Dial tone: 400Hz, continuous
    193         TONE_JAPAN_BUSY,            // Busy tone: 400Hz, 500ms ON, 500ms OFF...
    194         TONE_JAPAN_RADIO_ACK,       // Radio path acknowlegment: 400Hz, 1s ON, 2s OFF...
    195         NUM_ALTERNATE_TONES
    196     };
    197 
    198     enum region {
    199         ANSI,
    200         JAPAN,
    201         CEPT,
    202         NUM_REGIONS
    203     };
    204 
    205     static const unsigned char sToneMappingTable[NUM_REGIONS-1][NUM_SUP_TONES];
    206 
    207     static const unsigned int TONEGEN_MAX_WAVES = 3;     // Maximun number of sine waves in a tone segment
    208     static const unsigned int TONEGEN_MAX_SEGMENTS = 12;  // Maximun number of segments in a tone descriptor
    209     static const unsigned int TONEGEN_INF = 0xFFFFFFFF;  // Represents infinite time duration
    210     static const float TONEGEN_GAIN = 0.9;  // Default gain passed to  WaveGenerator().
    211 
    212     // ToneDescriptor class contains all parameters needed to generate a tone:
    213     //    - The array waveFreq[]:
    214     //         1 for static tone descriptors: contains the frequencies of all individual waves making the multi-tone.
    215     //         2 for active tone descritors: contains the indexes of the WaveGenerator objects in mWaveGens
    216     //        The number of sine waves varies from 1 to TONEGEN_MAX_WAVES.
    217     //        The first null value indicates that no more waves are needed.
    218     //    - The array segments[] is used to generate the tone pulses. A segment is a period of time
    219     //        during which the tone is ON or OFF.    Segments with even index (starting from 0)
    220     //        correspond to tone ON state and segments with odd index to OFF state.
    221     //        The data stored in segments[] is the duration of the corresponding period in ms.
    222     //        The first segment encountered with a 0 duration    indicates that no more segment follows.
    223     //    - loopCnt - Number of times to repeat a sequence of seqments after playing this
    224     //    - loopIndx - The segment index to go back and play is loopcnt > 0
    225     //    - repeatCnt indicates the number of times the sequence described by segments[] array must be repeated.
    226     //        When the tone generator encounters the first 0 duration segment, it will compare repeatCnt to mCurCount.
    227     //        If mCurCount > repeatCnt, the tone is stopped automatically. Otherwise, tone sequence will be
    228     //        restarted from segment repeatSegment.
    229     //    - repeatSegment number of the first repeated segment when repeatCnt is not null
    230 
    231     class ToneSegment {
    232     public:
    233         unsigned int duration;
    234         unsigned short waveFreq[TONEGEN_MAX_WAVES+1];
    235         unsigned short loopCnt;
    236         unsigned short loopIndx;
    237     };
    238 
    239     class ToneDescriptor {
    240     public:
    241         ToneSegment segments[TONEGEN_MAX_SEGMENTS+1];
    242         unsigned long repeatCnt;
    243         unsigned long repeatSegment;
    244     };
    245 
    246     static const ToneDescriptor sToneDescriptors[];
    247 
    248     bool mThreadCanCallJava;
    249     unsigned int mTotalSmp;  // Total number of audio samples played (gives current time)
    250     unsigned int mNextSegSmp;  // Position of next segment transition expressed in samples
    251     // NOTE: because mTotalSmp, mNextSegSmp are stored on 32 bit, current design will operate properly
    252     // only if tone duration is less than about 27 Hours(@44100Hz sampling rate). If this time is exceeded,
    253     // no crash will occur but tone sequence will show a glitch.
    254     unsigned int mMaxSmp;  // Maximum number of audio samples played (maximun tone duration)
    255     int mDurationMs;  // Maximum tone duration in ms
    256 
    257     unsigned short mCurSegment;  // Current segment index in ToneDescriptor segments[]
    258     unsigned short mCurCount;  // Current sequence repeat count
    259     volatile unsigned short mState;  // ToneGenerator state (tone_state)
    260     unsigned short mRegion;
    261     const ToneDescriptor *mpToneDesc;  // pointer to active tone descriptor
    262     const ToneDescriptor *mpNewToneDesc;  // pointer to next active tone descriptor
    263 
    264     unsigned short mLoopCounter; // Current tone loopback count
    265 
    266     uint32_t mSamplingRate;  // AudioFlinger Sampling rate
    267     AudioTrack *mpAudioTrack;  // Pointer to audio track used for playback
    268     Mutex mLock;  // Mutex to control concurent access to ToneGenerator object from audio callback and application API
    269     Mutex mCbkCondLock; // Mutex associated to mWaitCbkCond
    270     Condition mWaitCbkCond; // condition enabling interface to wait for audio callback completion after a change is requested
    271     float mVolume;  // Volume applied to audio track
    272     audio_stream_type_t mStreamType; // Audio stream used for output
    273     unsigned int mProcessSize;  // Size of audio blocks generated at a time by audioCallback() (in PCM frames).
    274     struct timespec mStartTime; // tone start time: needed to guaranty actual tone duration
    275 
    276     bool initAudioTrack();
    277     static void audioCallback(int event, void* user, void *info);
    278     bool prepareWave();
    279     unsigned int numWaves(unsigned int segmentIdx);
    280     void clearWaveGens();
    281     tone_type getToneForRegion(tone_type toneType);
    282 
    283     // WaveGenerator generates a single sine wave
    284     class WaveGenerator {
    285     public:
    286         enum gen_command {
    287             WAVEGEN_START,  // Start/restart wave from phase 0
    288             WAVEGEN_CONT,  // Continue wave from current phase
    289             WAVEGEN_STOP  // Stop wave on zero crossing
    290         };
    291 
    292         WaveGenerator(unsigned short samplingRate, unsigned short frequency,
    293                 float volume);
    294         ~WaveGenerator();
    295 
    296         void getSamples(short *outBuffer, unsigned int count,
    297                 unsigned int command);
    298 
    299     private:
    300         static const short GEN_AMP = 32000;  // amplitude of generator
    301         static const short S_Q14 = 14;  // shift for Q14
    302         static const short S_Q15 = 15;  // shift for Q15
    303 
    304         short mA1_Q14;  // Q14 coefficient
    305         // delay line of full amplitude generator
    306         short mS1, mS2;  // delay line S2 oldest
    307         short mS2_0;  // saved value for reinitialisation
    308         short mAmplitude_Q15;  // Q15 amplitude
    309     };
    310 
    311     KeyedVector<unsigned short, WaveGenerator *> mWaveGens;  // list of active wave generators.
    312 };
    313 
    314 }
    315 ;  // namespace android
    316 
    317 #endif /*ANDROID_TONEGENERATOR_H_*/
    318