|
0
|
1 |
// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
|
|
|
2 |
// All rights reserved.
|
|
|
3 |
// This component and the accompanying materials are made available
|
|
|
4 |
// under the terms of "Eclipse Public License v1.0"
|
|
|
5 |
// which accompanies this distribution, and is available
|
|
|
6 |
// at the URL "http://www.eclipse.org/legal/epl-v10.html".
|
|
|
7 |
//
|
|
|
8 |
// Initial Contributors:
|
|
|
9 |
// Nokia Corporation - initial contribution.
|
|
|
10 |
//
|
|
|
11 |
// Contributors:
|
|
|
12 |
//
|
|
|
13 |
// Description:
|
|
|
14 |
// This file contains an implementation of the ToneGenerator interface
|
|
|
15 |
// that converts all tone generation requests in to sampled audio
|
|
|
16 |
// data to be played through the normal local sampled audio interface
|
|
|
17 |
//
|
|
|
18 |
//
|
|
|
19 |
|
|
|
20 |
#include "ToneGenerator.h"
|
|
|
21 |
#include <e32math.h>
|
|
|
22 |
#include <mda/common/resource.h>
|
|
|
23 |
|
|
|
24 |
/******************************************************************************
|
|
|
25 |
* Tone Generators
|
|
|
26 |
*
|
|
|
27 |
* The following classes are used to generate simple frequency/duration tones,
|
|
|
28 |
* DTMF, and SymbianOS tone sequences in a WINS environment. The below code
|
|
|
29 |
* should only be considered for WINS.
|
|
|
30 |
******************************************************************************/
|
|
|
31 |
|
|
|
32 |
// this defines the maximum possible amplitude allowed for TSineGen::SetFrequency()
|
|
|
33 |
const TInt KMaxAmplitude = 0x8000;
|
|
|
34 |
|
|
|
35 |
// default number of samples for trailing silence following a Tone
|
|
|
36 |
const TInt KDefaultTrailingSilenceSamples = 20;
|
|
|
37 |
|
|
|
38 |
//
|
|
|
39 |
// Sine tone generator
|
|
|
40 |
//
|
|
|
41 |
|
|
|
42 |
const TInt16 TSineGen::SineTable[KMaxSineTable] =
|
|
|
43 |
{
|
|
|
44 |
0, 804, 1607, 2410, 3211, 4011, 4807, 5601,
|
|
|
45 |
6392, 7179, 7961, 8739, 9511, 10278, 11038, 11792,
|
|
|
46 |
12539, 13278, 14009, 14732, 15446, 16150, 16845, 17530,
|
|
|
47 |
18204, 18867, 19519, 20159, 20787, 21402, 22004, 22594,
|
|
|
48 |
23169, 23731, 24278, 24811, 25329, 25831, 26318, 26789,
|
|
|
49 |
27244, 27683, 28105, 28510, 28897, 29268, 29621, 29955,
|
|
|
50 |
30272, 30571, 30851, 31113, 31356, 31580, 31785, 31970,
|
|
|
51 |
32137, 32284, 32412, 32520, 32609, 32678, 32727, 32757,
|
|
|
52 |
32767, 32757, 32727, 32678, 32609, 32520, 32412, 32284,
|
|
|
53 |
32137, 31970, 31785, 31580, 31356, 31113, 30851, 30571,
|
|
|
54 |
30272, 29955, 29621, 29268, 28897, 28510, 28105, 27683,
|
|
|
55 |
27244, 26789, 26318, 25831, 25329, 24811, 24278, 23731,
|
|
|
56 |
23169, 22594, 22004, 21402, 20787, 20159, 19519, 18867,
|
|
|
57 |
18204, 17530, 16845, 16150, 15446, 14732, 14009, 13278,
|
|
|
58 |
12539, 11792, 11038, 10278, 9511, 8739, 7961, 7179,
|
|
|
59 |
6392, 5601, 4807, 4011, 3211, 2410, 1607, 804,
|
|
|
60 |
0, -804, -1607, -2410, -3211, -4011, -4807, -5601,
|
|
|
61 |
-6392, -7179, -7961, -8739, -9511,-10278,-11038,-11792,
|
|
|
62 |
-12539,-13278,-14009,-14732,-15446,-16150,-16845,-17530,
|
|
|
63 |
-18204,-18867,-19519,-20159,-20787,-21402,-22004,-22594,
|
|
|
64 |
-23169,-23731,-24278,-24811,-25329,-25831,-26318,-26789,
|
|
|
65 |
-27244,-27683,-28105,-28510,-28897,-29268,-29621,-29955,
|
|
|
66 |
-30272,-30571,-30851,-31113,-31356,-31580,-31785,-31970,
|
|
|
67 |
-32137,-32284,-32412,-32520,-32609,-32678,-32727,-32757,
|
|
|
68 |
-32767,-32757,-32727,-32678,-32609,-32520,-32412,-32284,
|
|
|
69 |
-32137,-31970,-31785,-31580,-31356,-31113,-30851,-30571,
|
|
|
70 |
-30272,-29955,-29621,-29268,-28897,-28510,-28105,-27683,
|
|
|
71 |
-27244,-26789,-26318,-25831,-25329,-24811,-24278,-23731,
|
|
|
72 |
-23169,-22594,-22004,-21402,-20787,-20159,-19519,-18867,
|
|
|
73 |
-18204,-17530,-16845,-16150,-15446,-14732,-14009,-13278,
|
|
|
74 |
-12539,-11792,-11038,-10278, -9511, -8739, -7961, -7179,
|
|
|
75 |
-6392, -5601, -4807, -4011, -3211, -2410, -1607, -804,
|
|
|
76 |
};
|
|
|
77 |
|
|
|
78 |
const TInt16 TSineGen::IncTable[KMaxSineTable] =
|
|
|
79 |
{
|
|
|
80 |
804, 803, 803, 801, 800, 796, 794,
|
|
|
81 |
791, 787, 782, 778, 772, 767, 760, 754,
|
|
|
82 |
747, 739, 731, 723, 714, 704, 695, 685,
|
|
|
83 |
674, 663, 652, 640, 628, 615, 602, 590,
|
|
|
84 |
575, 562, 547, 533, 518, 502, 487, 471,
|
|
|
85 |
455, 439, 422, 405, 387, 371, 353, 334,
|
|
|
86 |
317, 299, 280, 262, 243, 224, 205, 185,
|
|
|
87 |
167, 147, 128, 108, 89, 69, 49, 30,
|
|
|
88 |
10, -10, -30, -49, -69, -89, -108, -128,
|
|
|
89 |
-147, -167, -185, -205, -224, -243, -262, -280,
|
|
|
90 |
-299, -317, -334, -353, -371, -387, -405, -422,
|
|
|
91 |
-439, -455, -471, -487, -502, -518, -533, -547,
|
|
|
92 |
-562, -575, -590, -602, -615, -628, -640, -652,
|
|
|
93 |
-663, -674, -685, -695, -704, -714, -723, -731,
|
|
|
94 |
-739, -747, -754, -760, -767, -772, -778, -782,
|
|
|
95 |
-787, -791, -794, -796, -800, -801, -803, -803,
|
|
|
96 |
-804, -804, -803, -803, -801, -800, -796, -794,
|
|
|
97 |
-791, -787, -782, -778, -772, -767, -760, -754,
|
|
|
98 |
-747, -739, -731, -723, -714, -704, -695, -685,
|
|
|
99 |
-674, -663, -652, -640, -628, -615, -602, -590,
|
|
|
100 |
-575, -562, -547, -533, -518, -502, -487, -471,
|
|
|
101 |
-455, -439, -422, -405, -387, -371, -353, -334,
|
|
|
102 |
-317, -299, -280, -262, -243, -224, -205, -185,
|
|
|
103 |
-167, -147, -128, -108, -89, -69, -49, -30,
|
|
|
104 |
-10, 10, 30, 49, 69, 89, 108, 128,
|
|
|
105 |
147, 167, 185, 205, 224, 243, 262, 280,
|
|
|
106 |
299, 317, 334, 353, 371, 387, 405, 422,
|
|
|
107 |
439, 455, 471, 487, 502, 518, 533, 547,
|
|
|
108 |
562, 575, 590, 602, 615, 628, 640, 652,
|
|
|
109 |
663, 674, 685, 695, 704, 714, 723, 731,
|
|
|
110 |
739, 747, 754, 760, 767, 772, 778, 782,
|
|
|
111 |
787, 791, 794, 796, 800, 801, 803, 803,
|
|
|
112 |
804
|
|
|
113 |
};
|
|
|
114 |
|
|
|
115 |
void TSineGen::SetFrequency(TInt aFrequency,TInt aAmplitude)
|
|
|
116 |
//
|
|
|
117 |
// Given the frequency set iStep.
|
|
|
118 |
// Reset iPosition to the equivalent of 0 degrees.
|
|
|
119 |
// In the special case of aFrequency==4KHz set iPosition to 90 degrees.
|
|
|
120 |
//
|
|
|
121 |
{
|
|
|
122 |
|
|
|
123 |
if (aAmplitude>(1<<15))
|
|
|
124 |
iAmplitude=(1<<15);
|
|
|
125 |
else if (aAmplitude<-(1<<15))
|
|
|
126 |
iAmplitude=-(1<<15);
|
|
|
127 |
else
|
|
|
128 |
iAmplitude=aAmplitude;
|
|
|
129 |
//
|
|
|
130 |
// There are 256 entries in the sine table to traverse 360 degrees.
|
|
|
131 |
// The codec requires samples at a rate of 8000 per second.
|
|
|
132 |
// Thus for a 1Hz tone the step will be 256/8000 or 4/125.
|
|
|
133 |
// Now we need need the integer part of the result to end up in
|
|
|
134 |
// the MSB so we need to multiply by 2^24. This gives the formula
|
|
|
135 |
// step = (f*4*2^24)/125 or (f*2^26)/125.
|
|
|
136 |
// Our highest frequency is 4KHz so that the term (f*2^26) exceeds
|
|
|
137 |
// a 32 bit result by 4000/2^6 (2^6 is the number of significant bits
|
|
|
138 |
// left after a multiply by 2^26). i.e. 6 bits. We overcome this by
|
|
|
139 |
// having 6 bits less in the fraction, so the new formula becomes
|
|
|
140 |
// ((f*2^20)/125)*2^6. This still gives us 20 significant bits in the
|
|
|
141 |
// fraction.
|
|
|
142 |
//
|
|
|
143 |
|
|
|
144 |
iStep=(((TUint)aFrequency<<20)/125)<<6;
|
|
|
145 |
iPosition=(aFrequency==4000 ? 0x40000000 : 0);
|
|
|
146 |
}
|
|
|
147 |
|
|
|
148 |
TInt TSineGen::NextSample()
|
|
|
149 |
//
|
|
|
150 |
// Generate the next sample using linear interpolation
|
|
|
151 |
//
|
|
|
152 |
{
|
|
|
153 |
TUint pos=iPosition>>24;
|
|
|
154 |
TInt amp=((IncTable[pos]*((iPosition&0x00ffffff)>>20)));
|
|
|
155 |
amp>>=4;
|
|
|
156 |
amp+=SineTable[pos];
|
|
|
157 |
amp=(amp*iAmplitude)>>15;
|
|
|
158 |
iPosition+=iStep;
|
|
|
159 |
return(amp);
|
|
|
160 |
}
|
|
|
161 |
|
|
|
162 |
void TSineWave::Generate(TInt16* aDest,TInt aCount)
|
|
|
163 |
//
|
|
|
164 |
// Called when more samples need to be generated.
|
|
|
165 |
//
|
|
|
166 |
{
|
|
|
167 |
while (aCount--)
|
|
|
168 |
{
|
|
|
169 |
*aDest++=STATIC_CAST(TInt16,iGen1.NextSample()+iGen2.NextSample());
|
|
|
170 |
}
|
|
|
171 |
}
|
|
|
172 |
|
|
|
173 |
void TSineWave::SetFrequency(TInt aFrequency,TInt aAmplitude)
|
|
|
174 |
//
|
|
|
175 |
// Set to generate a single frequency
|
|
|
176 |
//
|
|
|
177 |
{
|
|
|
178 |
SetFrequency(aFrequency,aAmplitude,0,0);
|
|
|
179 |
}
|
|
|
180 |
|
|
|
181 |
void TSineWave::SetFrequency(TInt aFrequency1,TInt aAmplitude1,TInt aFrequency2,TInt aAmplitude2)
|
|
|
182 |
//
|
|
|
183 |
// Set to generate two frequencies
|
|
|
184 |
//
|
|
|
185 |
{
|
|
|
186 |
iGen1.SetFrequency(aFrequency1,aAmplitude1);
|
|
|
187 |
iGen2.SetFrequency(aFrequency2,aAmplitude2);
|
|
|
188 |
}
|
|
|
189 |
|
|
|
190 |
//
|
|
|
191 |
// TMdaToneGenerator
|
|
|
192 |
//
|
|
|
193 |
|
|
|
194 |
void TMdaToneGenerator::Configure(TInt aRate, TInt aChannels, TInt aRepeats, TInt aSilence, TInt aRampUp)
|
|
|
195 |
//
|
|
|
196 |
// Set up this tone generator to generate data at the desired sample rate
|
|
|
197 |
// and number of channels (typically mono/stereo)
|
|
|
198 |
//
|
|
|
199 |
{
|
|
|
200 |
iRate = aRate;
|
|
|
201 |
iChannels = aChannels;
|
|
|
202 |
iSamplesLeft = 0;
|
|
|
203 |
iIncompleteVolume = 0;
|
|
|
204 |
iRampUpRemainder = 0;
|
|
|
205 |
iRampUp = ETrue; // Default ramping to on as it is normally useful
|
|
|
206 |
iRampDown = ETrue;
|
|
|
207 |
iIncompleteRampDown = EFalse;
|
|
|
208 |
iIncompleteRampUp = EFalse;
|
|
|
209 |
iRepeats = aRepeats;
|
|
|
210 |
iSilenceBetweenRepeats = aSilence;
|
|
|
211 |
iRampUpCount = aRampUp;
|
|
|
212 |
iRampUpLeft = aRampUp;
|
|
|
213 |
iAfterRepeatSilence = EFalse;
|
|
|
214 |
}
|
|
|
215 |
|
|
|
216 |
LOCAL_C void RampVolume(TInt16* aData,TInt aCount,TInt aStartVol,TInt aEndVol)
|
|
|
217 |
//
|
|
|
218 |
// Simple function to ramp down the volume of some samples
|
|
|
219 |
// Typically used to prevent "clicking" artifacts at the beginning/end of tones
|
|
|
220 |
//
|
|
|
221 |
{
|
|
|
222 |
TInt step = (aEndVol - aStartVol)/aCount;
|
|
|
223 |
while (aCount--)
|
|
|
224 |
{
|
|
|
225 |
TInt data = TInt(*aData) * aStartVol;
|
|
|
226 |
*aData++ = TInt16(data>>15);
|
|
|
227 |
aStartVol += step;
|
|
|
228 |
}
|
|
|
229 |
}
|
|
|
230 |
|
|
|
231 |
TInt TMdaToneGenerator::FillBuffer(TDes8& aBuffer)
|
|
|
232 |
//
|
|
|
233 |
// Fill the supplied buffer with tone data
|
|
|
234 |
// Sets the buffer length to zero if there is no more data to play
|
|
|
235 |
// The buffer must have a max length of at least one sample * channels
|
|
|
236 |
// e.g. 2 bytes mono, 4 bytes stereo
|
|
|
237 |
//
|
|
|
238 |
{
|
|
|
239 |
const TInt KRampUpSamples = 50;
|
|
|
240 |
const TInt KRampDownSamples = 50;
|
|
|
241 |
|
|
|
242 |
ASSERT(aBuffer.MaxLength()>= (iChannels<<1));
|
|
|
243 |
aBuffer.SetMax();
|
|
|
244 |
|
|
|
245 |
TBool silence;
|
|
|
246 |
TInt samples = 0; //
|
|
|
247 |
TInt used = 0; // Data used
|
|
|
248 |
TInt avail = aBuffer.Length(); // Data filled
|
|
|
249 |
TInt count = 0; // Data to be converted
|
|
|
250 |
TBool rampUp = EFalse;
|
|
|
251 |
|
|
|
252 |
TMdaPtr8 fill;
|
|
|
253 |
fill.Set(aBuffer); // Pointer to data left to be filled
|
|
|
254 |
|
|
|
255 |
//
|
|
|
256 |
// The rest of this function will loop around continually until the buffer
|
|
|
257 |
// is filled or there is no more data to play
|
|
|
258 |
//
|
|
|
259 |
|
|
|
260 |
Restart:
|
|
|
261 |
silence = EFalse; // Reset
|
|
|
262 |
if (iSamplesLeft == 0)
|
|
|
263 |
{
|
|
|
264 |
if (iTrailingSilence == 0)
|
|
|
265 |
{
|
|
|
266 |
TInt error = GetNextTone();
|
|
|
267 |
if (error)
|
|
|
268 |
return error;
|
|
|
269 |
|
|
|
270 |
rampUp = ETrue;
|
|
|
271 |
if ((iSamplesLeft==0)&&(iTrailingSilence==0))
|
|
|
272 |
{
|
|
|
273 |
if ((iSilenceBetweenRepeats)&&(!iAfterRepeatSilence))
|
|
|
274 |
{
|
|
|
275 |
iTrailingSilence = iSilenceBetweenRepeats;
|
|
|
276 |
iAfterRepeatSilence = ETrue;
|
|
|
277 |
goto Restart;
|
|
|
278 |
}
|
|
|
279 |
else
|
|
|
280 |
{
|
|
|
281 |
if ((iRepeats>0)||(iRepeats==KMdaRepeatForever))
|
|
|
282 |
{
|
|
|
283 |
iAfterRepeatSilence = EFalse;
|
|
|
284 |
if (iRepeats>0)
|
|
|
285 |
iRepeats--;
|
|
|
286 |
|
|
|
287 |
Reset();
|
|
|
288 |
goto Restart;
|
|
|
289 |
}
|
|
|
290 |
}
|
|
|
291 |
// No more to play
|
|
|
292 |
goto Finished;
|
|
|
293 |
}
|
|
|
294 |
goto Restart;
|
|
|
295 |
}
|
|
|
296 |
else
|
|
|
297 |
{
|
|
|
298 |
silence = ETrue;
|
|
|
299 |
samples = iTrailingSilence;
|
|
|
300 |
}
|
|
|
301 |
}
|
|
|
302 |
else
|
|
|
303 |
samples = iSamplesLeft;
|
|
|
304 |
|
|
|
305 |
count = Min(samples,avail>>1);
|
|
|
306 |
fill.SetLength(count<<1);
|
|
|
307 |
|
|
|
308 |
if (!silence)
|
|
|
309 |
{ // Generate wave
|
|
|
310 |
iSineWave.Generate(REINTERPRET_CAST(TInt16*,&fill[0]),count);
|
|
|
311 |
|
|
|
312 |
if (iRampUp)
|
|
|
313 |
{
|
|
|
314 |
// Ramp up volume at beginning of tone
|
|
|
315 |
if (rampUp)
|
|
|
316 |
{ // Fade in first few samples
|
|
|
317 |
if(count < KRampUpSamples)
|
|
|
318 |
{
|
|
|
319 |
// Partial rampup due to being at the end of the buffer
|
|
|
320 |
TInt fadeInLength = Min(KRampUpSamples,(fill.Length()>>1));
|
|
|
321 |
iIncompleteVolume = (count*((1<<15)/KRampUpSamples));
|
|
|
322 |
RampVolume(CONST_CAST(TInt16*,REINTERPRET_CAST(const TInt16*,(&fill[0]))),fadeInLength,0,iIncompleteVolume);
|
|
|
323 |
iRampUpRemainder = fadeInLength;
|
|
|
324 |
iIncompleteRampUp = ETrue;
|
|
|
325 |
}
|
|
|
326 |
else
|
|
|
327 |
{
|
|
|
328 |
// Normal rampup
|
|
|
329 |
TInt fadeInLength = Min(Min(KRampUpSamples,iSamplesLeft),(fill.Length()>>1));
|
|
|
330 |
RampVolume(CONST_CAST(TInt16*,REINTERPRET_CAST(const TInt16*,(&fill[0]))),fadeInLength,0,1<<15);
|
|
|
331 |
iIncompleteRampUp = EFalse;
|
|
|
332 |
}
|
|
|
333 |
}
|
|
|
334 |
else if (iIncompleteRampUp)
|
|
|
335 |
{
|
|
|
336 |
// Completing partial rampup at the start of a new buffer
|
|
|
337 |
TInt fadeInLength = Min(Min((KRampUpSamples-iRampUpRemainder),iSamplesLeft),(fill.Length()>>1));
|
|
|
338 |
RampVolume(CONST_CAST(TInt16*,REINTERPRET_CAST(const TInt16*,(&fill[0]))),fadeInLength,iIncompleteVolume,1<<15);
|
|
|
339 |
iIncompleteRampUp = EFalse;
|
|
|
340 |
}
|
|
|
341 |
}
|
|
|
342 |
if (iRampDown)
|
|
|
343 |
{ // Ramp down volume at end of tone
|
|
|
344 |
if ((iSamplesLeft-count) < KRampDownSamples)
|
|
|
345 |
{
|
|
|
346 |
if(iSamplesLeft-count == 0)
|
|
|
347 |
{
|
|
|
348 |
// Fade out last few samples
|
|
|
349 |
TInt startVolume = 1<<15;;
|
|
|
350 |
TInt fadeOutLength = Min(Min(KRampDownSamples,iSamplesLeft),(fill.Length()>>1));
|
|
|
351 |
|
|
|
352 |
if(iIncompleteRampDown)
|
|
|
353 |
{
|
|
|
354 |
// Completing partial rampdown at the start of a new buffer
|
|
|
355 |
startVolume -= iIncompleteVolume;
|
|
|
356 |
iIncompleteRampDown = EFalse;
|
|
|
357 |
}
|
|
|
358 |
|
|
|
359 |
RampVolume(CONST_CAST(TInt16*,REINTERPRET_CAST(const TInt16*,(&(fill.Right(fadeOutLength<<1))[0]))),fadeOutLength,startVolume,0);
|
|
|
360 |
}
|
|
|
361 |
else if(iSamplesLeft-count > 0)
|
|
|
362 |
{
|
|
|
363 |
// Partial rampdown due to being at the end of the buffer
|
|
|
364 |
TInt rampDifference = (KRampDownSamples-(iSamplesLeft-count));
|
|
|
365 |
TInt fadeOutLength = Min(Min(rampDifference,iSamplesLeft),(fill.Length()>>1));
|
|
|
366 |
iIncompleteVolume = ((rampDifference*(1<<15))/KRampDownSamples);
|
|
|
367 |
|
|
|
368 |
RampVolume(CONST_CAST(TInt16*,REINTERPRET_CAST(const TInt16*,(&(fill.Right(fadeOutLength<<1))[0]))),fadeOutLength,1<<15,(1<<15)-iIncompleteVolume);
|
|
|
369 |
|
|
|
370 |
iIncompleteRampDown = ETrue;
|
|
|
371 |
}
|
|
|
372 |
}
|
|
|
373 |
}
|
|
|
374 |
iSamplesLeft -= count;
|
|
|
375 |
}
|
|
|
376 |
else
|
|
|
377 |
{ // Generate silence
|
|
|
378 |
fill.FillZ(count<<1);
|
|
|
379 |
iTrailingSilence -= count;
|
|
|
380 |
}
|
|
|
381 |
|
|
|
382 |
used += count<<1;
|
|
|
383 |
avail -= count<<1;
|
|
|
384 |
fill.Shift(count<<1);
|
|
|
385 |
|
|
|
386 |
if (avail>(iChannels<<1))
|
|
|
387 |
goto Restart;
|
|
|
388 |
|
|
|
389 |
Finished:
|
|
|
390 |
|
|
|
391 |
aBuffer.SetLength(used);
|
|
|
392 |
|
|
|
393 |
// Do any ramp up that is required
|
|
|
394 |
if (iRampUpLeft>0)
|
|
|
395 |
{
|
|
|
396 |
TInt words = iRampUpLeft * iChannels;
|
|
|
397 |
words = Min(words,used>>1);
|
|
|
398 |
if (words>0) // In case buffer has zero length...
|
|
|
399 |
{
|
|
|
400 |
TInt left = iRampUpLeft * iChannels;
|
|
|
401 |
TInt rampup = iRampUpCount * iChannels;
|
|
|
402 |
iRampUpLeft -= words/iChannels;
|
|
|
403 |
TInt16* sample = REINTERPRET_CAST(TInt16*,&aBuffer[0]);
|
|
|
404 |
while (words--)
|
|
|
405 |
{
|
|
|
406 |
TInt32 sampleValue = static_cast<TInt32>((*sample)*(rampup-(left--)));
|
|
|
407 |
*sample++ = static_cast<TInt16>(sampleValue/rampup);
|
|
|
408 |
}
|
|
|
409 |
}
|
|
|
410 |
}
|
|
|
411 |
|
|
|
412 |
return KErrNone;
|
|
|
413 |
}
|
|
|
414 |
|
|
|
415 |
TInt TMdaToneGenerator::DurationToSamples(const TTimeIntervalMicroSeconds& aDuration)
|
|
|
416 |
//
|
|
|
417 |
// Convert the given duration to a sample count using the current settings
|
|
|
418 |
//
|
|
|
419 |
{
|
|
|
420 |
const TInt64 KTInt64OneMilion = 1000000;
|
|
|
421 |
|
|
|
422 |
// Calculate duration as samples
|
|
|
423 |
TInt64 microSeconds(aDuration.Int64()); // MSVC doesn't like "aDuration.Int64()" in line below
|
|
|
424 |
TInt64 dur = ((TInt64(iRate) * TInt64(iChannels) * microSeconds) / KTInt64OneMilion);
|
|
|
425 |
if (I64HIGH(dur)>0)
|
|
|
426 |
return KMaxTInt; // Ridiculous!
|
|
|
427 |
else
|
|
|
428 |
return I64LOW(dur);
|
|
|
429 |
}
|
|
|
430 |
|
|
|
431 |
//
|
|
|
432 |
// TMdaSimpleToneGenerator
|
|
|
433 |
//
|
|
|
434 |
|
|
|
435 |
void TMdaSimpleToneGenerator::Reset()
|
|
|
436 |
{
|
|
|
437 |
iPlayed = EFalse;
|
|
|
438 |
}
|
|
|
439 |
|
|
|
440 |
void TMdaSimpleToneGenerator::SetFrequencyAndDuration(TInt aFrequency, const TTimeIntervalMicroSeconds& aDuration)
|
|
|
441 |
//
|
|
|
442 |
// Store the frequency and duration of the specified sine tone
|
|
|
443 |
//
|
|
|
444 |
{
|
|
|
445 |
iFrequency = aFrequency;
|
|
|
446 |
iDuration = aDuration;
|
|
|
447 |
iPlayed = EFalse;
|
|
|
448 |
}
|
|
|
449 |
|
|
|
450 |
TInt TMdaSimpleToneGenerator::GetNextTone()
|
|
|
451 |
//
|
|
|
452 |
// Simple implementation - just sets the supplied frequency and duration
|
|
|
453 |
//
|
|
|
454 |
{
|
|
|
455 |
// This class only plays one tone for the specified duration
|
|
|
456 |
if (!iPlayed)
|
|
|
457 |
{
|
|
|
458 |
iSamplesLeft = I64LOW((iDuration.Int64() * TInt64(iRate))/1000000);
|
|
|
459 |
iSineWave.SetFrequency(iFrequency,1<<14);
|
|
|
460 |
iPlayed = ETrue;
|
|
|
461 |
iTrailingSilence = 20; // Just to stop clicking
|
|
|
462 |
}
|
|
|
463 |
return KErrNone;
|
|
|
464 |
}
|
|
|
465 |
|
|
|
466 |
//
|
|
|
467 |
// TMdaDualToneGenerator
|
|
|
468 |
//
|
|
|
469 |
|
|
|
470 |
void TMdaDualToneGenerator::Reset()
|
|
|
471 |
{
|
|
|
472 |
iPlayed = EFalse;
|
|
|
473 |
}
|
|
|
474 |
|
|
|
475 |
void TMdaDualToneGenerator::SetFrequencyAndDuration(TInt aFrequencyOne, TInt aFrequencyTwo, const TTimeIntervalMicroSeconds& aDuration)
|
|
|
476 |
{
|
|
|
477 |
// Store the frequencies and duration of the specified dual tone
|
|
|
478 |
iFrequencyOne = aFrequencyOne;
|
|
|
479 |
iFrequencyTwo = aFrequencyTwo;
|
|
|
480 |
iDuration = aDuration;
|
|
|
481 |
iPlayed = EFalse;
|
|
|
482 |
}
|
|
|
483 |
|
|
|
484 |
//
|
|
|
485 |
// This is called by TMdaToneGenerator::FillBuffer()
|
|
|
486 |
// to calculate the number of samples (iSamplesLeft) that will be needed
|
|
|
487 |
// for the tone to be played and to initialize the sine wave generator.
|
|
|
488 |
// If the tone has already been played, then leaves iSamplesLeft
|
|
|
489 |
// unmodified (should be zero) to indicate that it has finished.
|
|
|
490 |
//
|
|
|
491 |
TInt TMdaDualToneGenerator::GetNextTone()
|
|
|
492 |
{
|
|
|
493 |
// This class only plays one tone for the specified duration
|
|
|
494 |
if (!iPlayed)
|
|
|
495 |
{
|
|
|
496 |
iSamplesLeft = I64LOW((iDuration.Int64() * TInt64(iRate))/KOneMillionMicroSeconds);
|
|
|
497 |
iSineWave.SetFrequency(iFrequencyOne, KMaxAmplitude/2, iFrequencyTwo, KMaxAmplitude/2);
|
|
|
498 |
iPlayed = ETrue;
|
|
|
499 |
iTrailingSilence = KDefaultTrailingSilenceSamples; // Just to stop clicking
|
|
|
500 |
}
|
|
|
501 |
return KErrNone;
|
|
|
502 |
}
|
|
|
503 |
//
|
|
|
504 |
// TMdaDTMFGenerator
|
|
|
505 |
//
|
|
|
506 |
|
|
|
507 |
const TInt KRecalculateToneLengths = KMinTInt;
|
|
|
508 |
|
|
|
509 |
void TMdaDTMFGenerator::Reset()
|
|
|
510 |
{
|
|
|
511 |
iChar = 0;
|
|
|
512 |
}
|
|
|
513 |
|
|
|
514 |
void TMdaDTMFGenerator::SetToneDurations(const TTimeIntervalMicroSeconds32 aOn,
|
|
|
515 |
const TTimeIntervalMicroSeconds32 aOff,
|
|
|
516 |
const TTimeIntervalMicroSeconds32 aPause)
|
|
|
517 |
//
|
|
|
518 |
// Setup the DTMF tone durations
|
|
|
519 |
// aOn can be == -1 indicating should play first tone indefinately
|
|
|
520 |
//
|
|
|
521 |
{
|
|
|
522 |
ASSERT(aOn.Int() >=-1);
|
|
|
523 |
ASSERT(aOff.Int()>=0);
|
|
|
524 |
ASSERT(aPause.Int()>=0);
|
|
|
525 |
|
|
|
526 |
iOn = aOn;
|
|
|
527 |
iOff = aOff;
|
|
|
528 |
iPause = aPause;
|
|
|
529 |
|
|
|
530 |
iOnSamples = KRecalculateToneLengths; // Must recalculate these later
|
|
|
531 |
}
|
|
|
532 |
|
|
|
533 |
void TMdaDTMFGenerator::SetString(const TDesC& aDTMFString)
|
|
|
534 |
//
|
|
|
535 |
// Store the DTMF string to be played
|
|
|
536 |
// No need to validate it as it will already have been checked
|
|
|
537 |
//
|
|
|
538 |
{
|
|
|
539 |
iChar = 0;
|
|
|
540 |
iDTMFString = &aDTMFString;
|
|
|
541 |
}
|
|
|
542 |
|
|
|
543 |
const TUint8 KDtmfVolumeTable[4][4]=
|
|
|
544 |
//
|
|
|
545 |
// Relative strengths to assign to different DTMF tones
|
|
|
546 |
//
|
|
|
547 |
// This is only important if DTMFs are being played through a speaker
|
|
|
548 |
// and need to be machine-recognisable. This table compensates for frequency
|
|
|
549 |
// drop-off in the speaker and can boost the relative volume of some
|
|
|
550 |
// frequencies so they are still within tolerance.
|
|
|
551 |
//
|
|
|
552 |
// The values normally need to be determined using a frequency analyser on
|
|
|
553 |
// the hardware
|
|
|
554 |
//
|
|
|
555 |
// Each column == same low frequency (697, 770, 852, 941 Hz)
|
|
|
556 |
// Each row == same high frequency (1209, 1336, 1477, 1633 Hz)
|
|
|
557 |
//
|
|
|
558 |
// The value are interpreted as ratios:
|
|
|
559 |
// 0 == 100% low
|
|
|
560 |
// 7f == 50% low, 50% high
|
|
|
561 |
// ff == 100% high
|
|
|
562 |
//
|
|
|
563 |
{
|
|
|
564 |
{38,27,29,37},
|
|
|
565 |
{46,36,36,46},
|
|
|
566 |
{62,47,49,58},
|
|
|
567 |
{70,56,60,68}
|
|
|
568 |
};
|
|
|
569 |
|
|
|
570 |
const TUint8 KDtmfTone697=0x0;
|
|
|
571 |
const TUint8 KDtmfTone770=0x1;
|
|
|
572 |
const TUint8 KDtmfTone852=0x2;
|
|
|
573 |
const TUint8 KDtmfTone941=0x3;
|
|
|
574 |
|
|
|
575 |
const TUint8 KDtmfTone1209=0x00;
|
|
|
576 |
const TUint8 KDtmfTone1336=0x10;
|
|
|
577 |
const TUint8 KDtmfTone1477=0x20;
|
|
|
578 |
const TUint8 KDtmfTone1633=0x30;
|
|
|
579 |
|
|
|
580 |
const TUint8 KDtmfToneTable[16]=
|
|
|
581 |
{
|
|
|
582 |
KDtmfTone941|KDtmfTone1336,//0
|
|
|
583 |
KDtmfTone697|KDtmfTone1209,//1
|
|
|
584 |
KDtmfTone697|KDtmfTone1336,//2
|
|
|
585 |
KDtmfTone697|KDtmfTone1477,//3
|
|
|
586 |
KDtmfTone770|KDtmfTone1209,//4
|
|
|
587 |
KDtmfTone770|KDtmfTone1336,//5
|
|
|
588 |
KDtmfTone770|KDtmfTone1477,//6
|
|
|
589 |
KDtmfTone852|KDtmfTone1209,//7
|
|
|
590 |
KDtmfTone852|KDtmfTone1336,//8
|
|
|
591 |
KDtmfTone852|KDtmfTone1477,//9
|
|
|
592 |
|
|
|
593 |
KDtmfTone697|KDtmfTone1633,//A
|
|
|
594 |
KDtmfTone770|KDtmfTone1633,//B
|
|
|
595 |
KDtmfTone852|KDtmfTone1633,//C
|
|
|
596 |
KDtmfTone941|KDtmfTone1633,//D
|
|
|
597 |
KDtmfTone941|KDtmfTone1209,//E or *
|
|
|
598 |
KDtmfTone941|KDtmfTone1477,//F or #
|
|
|
599 |
};
|
|
|
600 |
|
|
|
601 |
TInt TMdaDTMFGenerator::GetNextTone()
|
|
|
602 |
//
|
|
|
603 |
// Setup frequency/duration/silence settings for next DTMF tone
|
|
|
604 |
// Supported characters are 0-9 A-F * # , and any kind of white space
|
|
|
605 |
//
|
|
|
606 |
{
|
|
|
607 |
TBool onlyPlayFirstTone = EFalse;
|
|
|
608 |
|
|
|
609 |
if (iOnSamples == KRecalculateToneLengths)
|
|
|
610 |
{
|
|
|
611 |
// Must recalculate tone durations as samples
|
|
|
612 |
|
|
|
613 |
// Handle special case where tone on duration negative
|
|
|
614 |
// - meaning play first character indefinately
|
|
|
615 |
if (iOn.Int()>=0)
|
|
|
616 |
iOnSamples = DurationToSamples(TInt64(iOn.Int()));
|
|
|
617 |
else
|
|
|
618 |
{
|
|
|
619 |
onlyPlayFirstTone = ETrue;
|
|
|
620 |
iOnSamples = -1;
|
|
|
621 |
}
|
|
|
622 |
|
|
|
623 |
iOffSamples = DurationToSamples(TInt64(iOff.Int()));
|
|
|
624 |
iPauseSamples = DurationToSamples(TInt64(iPause.Int()));
|
|
|
625 |
}
|
|
|
626 |
|
|
|
627 |
ASSERT(iDTMFString);
|
|
|
628 |
|
|
|
629 |
if (iChar==iDTMFString->Length())
|
|
|
630 |
return KErrNone; // Finished. Nothing to do
|
|
|
631 |
|
|
|
632 |
TInt highFrequency = 0;
|
|
|
633 |
TInt highVolume = 0;
|
|
|
634 |
TInt lowFrequency = 0;
|
|
|
635 |
TInt lowVolume =0;
|
|
|
636 |
|
|
|
637 |
Retry:
|
|
|
638 |
TChar c((*iDTMFString)[iChar++]);
|
|
|
639 |
if ((TUint)c=='#' || (TUint)c=='*' || c.IsHexDigit())
|
|
|
640 |
{
|
|
|
641 |
TInt tableIndex;
|
|
|
642 |
switch ((TUint)c)
|
|
|
643 |
{
|
|
|
644 |
case '*':
|
|
|
645 |
tableIndex=14;
|
|
|
646 |
break;
|
|
|
647 |
case '#':
|
|
|
648 |
tableIndex=15;
|
|
|
649 |
break;
|
|
|
650 |
default:
|
|
|
651 |
if (c.IsDigit())
|
|
|
652 |
tableIndex=(TUint)c-'0';
|
|
|
653 |
else //letter
|
|
|
654 |
{
|
|
|
655 |
c.UpperCase();
|
|
|
656 |
tableIndex=(TUint)c-'A'+10;
|
|
|
657 |
}
|
|
|
658 |
}
|
|
|
659 |
TInt high=KDtmfToneTable[tableIndex]&0xf0;
|
|
|
660 |
TInt low=KDtmfToneTable[tableIndex]&0x0f;
|
|
|
661 |
switch(high)
|
|
|
662 |
{
|
|
|
663 |
case KDtmfTone1209:
|
|
|
664 |
highFrequency=1209;
|
|
|
665 |
break;
|
|
|
666 |
case KDtmfTone1336:
|
|
|
667 |
highFrequency=1336;
|
|
|
668 |
break;
|
|
|
669 |
case KDtmfTone1477:
|
|
|
670 |
highFrequency=1477;
|
|
|
671 |
break;
|
|
|
672 |
default://KDtmfTone1633:
|
|
|
673 |
highFrequency=1633;
|
|
|
674 |
break;
|
|
|
675 |
}
|
|
|
676 |
switch(low)
|
|
|
677 |
{
|
|
|
678 |
case KDtmfTone697:
|
|
|
679 |
lowFrequency=697;
|
|
|
680 |
break;
|
|
|
681 |
case KDtmfTone770:
|
|
|
682 |
lowFrequency=770;
|
|
|
683 |
break;
|
|
|
684 |
case KDtmfTone852:
|
|
|
685 |
lowFrequency=852;
|
|
|
686 |
break;
|
|
|
687 |
default://KDtmfTone941:
|
|
|
688 |
lowFrequency=941;
|
|
|
689 |
break;
|
|
|
690 |
}
|
|
|
691 |
high>>=4;
|
|
|
692 |
const TUint8* dtmfVolumes=&KDtmfVolumeTable[0][0];
|
|
|
693 |
TInt volume=dtmfVolumes[((low)<<2)+(high)]<<7;
|
|
|
694 |
highVolume = volume;
|
|
|
695 |
lowVolume = (1<<15)-volume;
|
|
|
696 |
|
|
|
697 |
iTrailingSilence = iOffSamples;
|
|
|
698 |
iSamplesLeft = iOnSamples;
|
|
|
699 |
}
|
|
|
700 |
else if ((TUint)c==',')
|
|
|
701 |
{
|
|
|
702 |
iTrailingSilence = iPauseSamples;
|
|
|
703 |
iSamplesLeft = 0;
|
|
|
704 |
}
|
|
|
705 |
else if (c.IsSpace())
|
|
|
706 |
{
|
|
|
707 |
if (iChar < iDTMFString->Length())
|
|
|
708 |
goto Retry;
|
|
|
709 |
}
|
|
|
710 |
else
|
|
|
711 |
return KErrCorrupt;
|
|
|
712 |
|
|
|
713 |
if (iOnSamples < 0) // Play only first character for ever
|
|
|
714 |
{
|
|
|
715 |
iTrailingSilence = 0;
|
|
|
716 |
iSamplesLeft = iRate * iChannels; // One second of samples
|
|
|
717 |
iChar = 0; // Reset so this character is played again next time
|
|
|
718 |
iRampDown = EFalse;
|
|
|
719 |
if (!onlyPlayFirstTone)
|
|
|
720 |
{
|
|
|
721 |
iRampUp = EFalse;
|
|
|
722 |
// This is not the first time around so we should not
|
|
|
723 |
// reset the tone generator - it will already have the
|
|
|
724 |
// correct settings and setting them again would cause
|
|
|
725 |
// an audible discontinuity
|
|
|
726 |
return KErrNone;
|
|
|
727 |
}
|
|
|
728 |
}
|
|
|
729 |
|
|
|
730 |
iSineWave.SetFrequency(highFrequency,highVolume,lowFrequency,lowVolume);
|
|
|
731 |
return KErrNone;
|
|
|
732 |
}
|
|
|
733 |
|
|
|
734 |
//
|
|
|
735 |
// TMdaSequenceGenerator
|
|
|
736 |
//
|
|
|
737 |
|
|
|
738 |
//
|
|
|
739 |
// Sequence constants
|
|
|
740 |
//
|
|
|
741 |
|
|
|
742 |
//const TInt KMaxFixedSequenceStack=KMaxSequenceStack;//Max nesting level of FixedSequences * 2
|
|
|
743 |
#ifdef _DEBUG
|
|
|
744 |
const TInt16 KFixedSequenceSignatureOne='S'+('Q'<<8);
|
|
|
745 |
const TInt16 KFixedSequenceSignatureTwo='N'+('C'<<8);
|
|
|
746 |
#endif // _DEBUG
|
|
|
747 |
|
|
|
748 |
const TInt KFixedSequenceFunctionReturn=-1;
|
|
|
749 |
const TInt KFixedSequenceFunctionStartLoop=-2;
|
|
|
750 |
const TInt KFixedSequenceFunctionEndLoop=-3;
|
|
|
751 |
|
|
|
752 |
void TMdaSequenceGenerator::Reset()
|
|
|
753 |
{
|
|
|
754 |
iInstructionPtr = REINTERPRET_CAST(const TInt16*,&((*iSequenceData)[0]));
|
|
|
755 |
iInstructionPtr += 2; // Skip signature
|
|
|
756 |
iStackIndex = 0;
|
|
|
757 |
}
|
|
|
758 |
|
|
|
759 |
void TMdaSequenceGenerator::SetSequenceData(const TDesC8& aSequenceData)
|
|
|
760 |
//
|
|
|
761 |
// Store the sequence data to be played
|
|
|
762 |
// No need to validate it as it will already have been checked
|
|
|
763 |
//
|
|
|
764 |
{
|
|
|
765 |
iSequenceData = &aSequenceData;
|
|
|
766 |
iInstructionPtr = REINTERPRET_CAST(const TInt16*,&aSequenceData[0]);
|
|
|
767 |
iLastInstruction = iInstructionPtr + (iSequenceData->Length()>>1) - 1;
|
|
|
768 |
|
|
|
769 |
// These are asserts because this should not be called if signature not present
|
|
|
770 |
ASSERT(*iInstructionPtr == KFixedSequenceSignatureOne);
|
|
|
771 |
ASSERT(*(iInstructionPtr+1) == KFixedSequenceSignatureTwo);
|
|
|
772 |
|
|
|
773 |
iInstructionPtr += 2; // Skip signature
|
|
|
774 |
|
|
|
775 |
iStackIndex = 0;
|
|
|
776 |
}
|
|
|
777 |
|
|
|
778 |
TInt TMdaSequenceGenerator::GetNextTone()
|
|
|
779 |
//
|
|
|
780 |
//
|
|
|
781 |
{
|
|
|
782 |
ASSERT(iInstructionPtr); // Sanity check
|
|
|
783 |
|
|
|
784 |
TInt ret = KRequestPending;
|
|
|
785 |
while (ret == KRequestPending)
|
|
|
786 |
{
|
|
|
787 |
if (iInstructionPtr > iLastInstruction)
|
|
|
788 |
ret = KErrCorrupt;
|
|
|
789 |
else if (*iInstructionPtr<=0)
|
|
|
790 |
{
|
|
|
791 |
switch (*iInstructionPtr)
|
|
|
792 |
{
|
|
|
793 |
case KFixedSequenceFunctionReturn: // End of sequence
|
|
|
794 |
ret = KErrNone;
|
|
|
795 |
break;
|
|
|
796 |
|
|
|
797 |
case KFixedSequenceFunctionStartLoop:
|
|
|
798 |
if (iStackIndex>2) // Validate - can only nest twice
|
|
|
799 |
ret = KErrCorrupt;
|
|
|
800 |
else if ((iInstructionPtr+2) > iLastInstruction)
|
|
|
801 |
ret = KErrCorrupt; // Don't run off end of sequence
|
|
|
802 |
else
|
|
|
803 |
{
|
|
|
804 |
iStack[iStackIndex++]=(TInt)(iInstructionPtr+2);
|
|
|
805 |
iStack[iStackIndex++]=(TInt)*(iInstructionPtr+1);
|
|
|
806 |
iInstructionPtr+=2;
|
|
|
807 |
}
|
|
|
808 |
break;
|
|
|
809 |
|
|
|
810 |
case KFixedSequenceFunctionEndLoop:
|
|
|
811 |
if (iStackIndex==0) // Validate - must already be nested
|
|
|
812 |
ret = KErrCorrupt;
|
|
|
813 |
else
|
|
|
814 |
{
|
|
|
815 |
if ((--iStack[iStackIndex-1])!=0)
|
|
|
816 |
iInstructionPtr=(TInt16*)iStack[iStackIndex-2];
|
|
|
817 |
else
|
|
|
818 |
{
|
|
|
819 |
iStackIndex-=2;
|
|
|
820 |
iInstructionPtr++;
|
|
|
821 |
}
|
|
|
822 |
}
|
|
|
823 |
break;
|
|
|
824 |
|
|
|
825 |
default: // Bad sequence
|
|
|
826 |
ret = KErrCorrupt;
|
|
|
827 |
}
|
|
|
828 |
}
|
|
|
829 |
else
|
|
|
830 |
{
|
|
|
831 |
if ((iInstructionPtr+5) > iLastInstruction)
|
|
|
832 |
ret = KErrCorrupt; // Don't run off end of sequence
|
|
|
833 |
else
|
|
|
834 |
{
|
|
|
835 |
iSamplesLeft = *iInstructionPtr++;
|
|
|
836 |
TInt freqOne = *iInstructionPtr++;
|
|
|
837 |
TInt volOne = *iInstructionPtr++;
|
|
|
838 |
TInt freqTwo = *iInstructionPtr++;
|
|
|
839 |
TInt volTwo = *iInstructionPtr++;
|
|
|
840 |
|
|
|
841 |
if ((volOne> 1<<15)||(volTwo > 1<<15))
|
|
|
842 |
ret = KErrCorrupt;
|
|
|
843 |
else
|
|
|
844 |
{
|
|
|
845 |
iSineWave.SetFrequency(freqOne,volOne,freqTwo,volTwo);
|
|
|
846 |
ret = KErrNone;
|
|
|
847 |
}
|
|
|
848 |
}
|
|
|
849 |
}
|
|
|
850 |
}
|
|
|
851 |
return ret;
|
|
|
852 |
}
|
|
|
853 |
|
|
|
854 |
// ---------------------------------
|
|
|
855 |
// Code to generate sine table files used by tone generator
|
|
|
856 |
// Optionally called from InitL()
|
|
|
857 |
// #define GENERATE_SINE_TABLES 1
|
|
|
858 |
#ifdef GENERATE_SINE_TABLES
|
|
|
859 |
LOCAL_C GenerateSineTableL()
|
|
|
860 |
{
|
|
|
861 |
_LIT(KSineFile,"sine.txt");
|
|
|
862 |
_LIT(KSineIncFile,"sineinc.txt");
|
|
|
863 |
|
|
|
864 |
RFile file;
|
|
|
865 |
file.Replace(MdaManager::Fs(),KSineFile,EFileWrite);
|
|
|
866 |
CleanupClosePushL(file);
|
|
|
867 |
|
|
|
868 |
RFile file2;
|
|
|
869 |
file2.Replace(MdaManager::Fs(),KSineIncFile,EFileWrite);
|
|
|
870 |
CleanupClosePushL(file2);
|
|
|
871 |
|
|
|
872 |
const TReal pi=3.141592653589;
|
|
|
873 |
const TReal twopi=pi*2;
|
|
|
874 |
const TReal samples = 256.0;
|
|
|
875 |
const TReal step = twopi/samples;
|
|
|
876 |
|
|
|
877 |
TBuf8<128> sinebuffer;
|
|
|
878 |
TBuf8<128> incbuffer;
|
|
|
879 |
TReal res;
|
|
|
880 |
TInt first=0;
|
|
|
881 |
TInt last=KMaxTInt;
|
|
|
882 |
TInt current;
|
|
|
883 |
_LIT8(KFormat,"%6d,");
|
|
|
884 |
_LIT8(KNewLine,"\n");
|
|
|
885 |
|
|
|
886 |
for(TReal angle=0.0;angle<=(twopi-step);) // Copes with rounding errors
|
|
|
887 |
{
|
|
|
888 |
sinebuffer.Zero();
|
|
|
889 |
incbuffer.Zero();
|
|
|
890 |
for (int i=0;i<8;i++)
|
|
|
891 |
{
|
|
|
892 |
User::LeaveIfError(Math::Sin(res,angle));
|
|
|
893 |
current = TInt(KMaxTInt16*res);
|
|
|
894 |
sinebuffer.AppendFormat(KFormat,current);
|
|
|
895 |
if (last != KMaxTInt)
|
|
|
896 |
incbuffer.AppendFormat(KFormat,current-last);
|
|
|
897 |
else
|
|
|
898 |
first = current;
|
|
|
899 |
last = current;
|
|
|
900 |
angle += step;
|
|
|
901 |
}
|
|
|
902 |
sinebuffer.Append(KNewLine);
|
|
|
903 |
incbuffer.Append(KNewLine);
|
|
|
904 |
file.Write(sinebuffer);
|
|
|
905 |
file2.Write(incbuffer);
|
|
|
906 |
}
|
|
|
907 |
|
|
|
908 |
// Write fine difference to incbuffer - differnece between first and last
|
|
|
909 |
incbuffer.Zero();
|
|
|
910 |
incbuffer.AppendFormat(KFormat,first-last);
|
|
|
911 |
incbuffer.Append(KNewLine);
|
|
|
912 |
file2.Write(incbuffer);
|
|
|
913 |
|
|
|
914 |
CleanupStack::PopAndDestroy(2);
|
|
|
915 |
}
|
|
|
916 |
#endif
|
|
|
917 |
//-------------------------------
|