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173 lines
6.1 KiB
173 lines
6.1 KiB
/* TestCompressor2.ino Bob Larkin 23 January 2021
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*
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* Test of AudioEffectCompressor2_F32
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* See AudioEffectCompressor2_F32.h for much detail and explanation.
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* Choice of test signals is a single sine wave, a random sequence
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* of sine waves of varying frequency and amplitude, a power
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* sweep or a pulse of sine wave to see transient behavior.
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*
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* This version is for the Chip Audette OpenAudio_F32 Library. and
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* thus has that interface structure.
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*
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* NOTE: As of 23 January 2021, the compressor AudioEffectWDRC2_F32.h
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* was not finalized and could change in detail. Use here with
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* this in mind.
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*/
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#include "Audio.h"
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#include "OpenAudio_ArduinoLibrary.h"
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#define RANDOM 1
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#define POWER_SWEEP 2
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#define PULSE 3
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#define ALTERNATE 4
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// Edit in one of the last four, here:
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#define SIGNAL_SOURCE RANDOM
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AudioSynthWaveformSine_F32 sine1; // Test signal
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AudioEffectCompressor2_F32 compressor1; // Audio Compressor
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AudioEffectGain_F32 gain0; // Sets volume sent to output
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AudioEffectGain_F32 gain1; // Sets the same
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AudioOutputI2S_F32 i2sOut;
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AudioConnection_F32 patchCord1(sine1, 0, compressor1, 0);
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AudioConnection_F32 patchCord2(compressor1, 0, gain0, 0);
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AudioConnection_F32 patchCord3(compressor1, 0, gain1, 0);
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AudioConnection_F32 patchCord4(gain0, 0, i2sOut, 0);
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AudioConnection_F32 patchCord5(gain1, 0, i2sOut, 1);
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AudioControlSGTL5000 sgtl5000_1;
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uint16_t count17, count27;
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float level = 0.05f;
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void setup(void) {
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AudioMemory(50);
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AudioMemory_F32(100);
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Serial.begin(300); delay(1000);
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Serial.println("*** Test Compressor2 Gain Compressor **");
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count17 = 0;
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count27 = 0;
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sine1.frequency(1000.0f);
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sine1.amplitude(0.05f);
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// CAUTION - If using ears on the output, adjust the following two carefully
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gain0.setGain_dB(-25.0f); // Consider (-50.0f);
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gain1.setGain_dB(-25.0f); // Consider (-50.0f);
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sgtl5000_1.enable();
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int16_t delaySize = 256; // Any power of 2, i.e., 256, 128, 64, etc.
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compressor1.setDelayBufferSize(delaySize);
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// *** Here are four sample compressor curves. ***
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// Select by number here, and re-compile.
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#define COMPRESSOR_CURVE 1
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#if COMPRESSOR_CURVE == 1
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// Specify arbitrary 5-segment compression curve. An example of specifying
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// compressionCurve. See AudioEffectCompressor2_F32.h for more details.
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struct compressionCurve crv = { -2.0f, 0.0f, // margin, offset
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{0.0f, -10.0f, -20.0f, -30.0f, -1000.0f}, // kneeDB[]
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{ 100.0f, 2.5f, 1.5f, 1.0f, 1.0f} }; // compressionRatio
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compressor1.setCompressionCurve(&crv);
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compressor1.begin();
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#endif
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AudioEffectCompressor2_F32 *pc1 = &compressor1; // Needed for any *macro* defined curve.
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// Defines pointer to compressor1, called pc1
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#if COMPRESSOR_CURVE == 2
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// Sample of a limiter at -3 dB out for highest 15 dB, limiter macro
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limiterBegin(pc1, -3.0f, -15.0f); // pc1 is a pointer to compressor1 object
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#elif COMPRESSOR_CURVE == 3
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// Another one, a basic compressor curve:
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// (pobject, linearInDB, compressionRatioDB) <- macro parameters
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basicCompressorBegin(pc1, -25.0f, 2.0);
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#elif COMPRESSOR_CURVE == 4
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// And one using a high gain region as a squelch (but no clicks or pops)
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// (squelchIndB, linearInDB, compressionIndB, compressionRatioDB) <- macro parameters
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squelchCompressorBegin(pc1, -40.0f, -25.0f, -10.0f, 1.5f);
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#endif
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}
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void loop(void)
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{
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static uint16_t kk;
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#if SIGNAL_SOURCE == RANDOM
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/* To give an audio signal with interest, we alter the frequency
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* every 17 blocks (49 msec) and alter the level every 27 b;ocks
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* (78.4 msec) The pattern keeps changing to be more interesting
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* Janet thinks it is aliens. */
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delay(3);
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// Serial.print(" CurInDB= "); Serial.print( compressor1.getCurrentInputDB(), 3);
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// Serial.print(" CurrentGainDB= "); Serial.println( compressor1.getCurrentGainDB(), 3);
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// Serial.print("Maximum Input = "); Serial.println(compressor1.getvInMaxDB());
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if(count17++ == 17)
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{
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// Put a delay in, like between words
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if(randUniform() < 0.03)
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delay( (int)(1500.0*randUniform()) );
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count17 = 0;
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float ff = 350.0f + 700.0f*sqrtf( randUniform() );
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sine1.frequency(ff); //Serial.println(ff);
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}
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if(count27++ == 27)
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{
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count27 = 0;
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level = 1.0f*powf( randUniform(), 2 ); // 0 to 1, emphasizing 0 end
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sine1.amplitude(level);
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}
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#elif SIGNAL_SOURCE == POWER_SWEEP
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if(count17++ == 17)
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{
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count17 = 0;
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level *= 1.0592537f; // 0.5 dB
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delay(200);
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if(level > 1.0f)
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{
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level=0.001f;
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delay(500);
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}
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Serial.print( compressor1.getCurrentInputDB(), 3);
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Serial.print(","); Serial.println( compressor1.getCurrentGainDB(), 3);
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sine1.amplitude(level);
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}
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#elif SIGNAL_SOURCE == PULSE
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// A pulse, repeats every 3 minutes or so
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delay(3);
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if(count17 == 5) sine1.amplitude(0.0f); // Settling
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else if(count17 == 498) compressor1.printOn(true); //record it
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else if(count17 == 500) sine1.amplitude(0.03f);
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else if(count17 == 510) sine1.amplitude(0.0f);
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else if(count17 == 700) compressor1.printOn(false);
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// or build your own transient test pulse here
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count17++;
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#endif
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}
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/* randUniform() - Returns random number, uniform on (0, 1)
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* The "Even Quicker" uniform random sample generator from D. E. Knuth and
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* H. W. Lewis and described in Chapter 7 of "Numerical Receipes in C",
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* 2nd ed, with the comment "this is about as good as any 32-bit linear
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* congruential generator, entirely adequate for many uses."
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*/
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#define FL_ONE 0X3F800000
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#define FL_MASK 0X007FFFFF
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float randUniform(void)
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{
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static uint32_t idum = 12345;
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union {
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uint32_t i32;
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float f32;
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} uinf;
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idum = (uint32_t)1664525 * idum + (uint32_t)1013904223;
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// return (*(float *)&it); // Cute convert to float but gets compiler warning
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uinf.i32 = FL_ONE | (FL_MASK & idum); // So do the same thing with a union
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return uinf.f32 - 1.0f;
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}
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