Removed bad preemphasis filter

sample.cpp

@@ -55,18 +55,4 @@ Sample::Sample(uint8_t *data, uint16_t channels, uint16_t bitsPerChannel)
 float Sample::getMonoValue() const
 {
     return value;
-}
-
-#ifndef NO_PREEMP
-PreEmphasis::PreEmphasis(uint32_t sampleRate)
-    : timeConst(sampleRate * 75.0e-6f), prevValue(0.f)
-{
-}
-
-float PreEmphasis::filter(float value)
-{
-    value = value + (prevValue - value) / (1.f - timeConst);
-    prevValue = value;
-    return value;
-}
-#endif
+}

sample.hpp

@@ -45,15 +45,4 @@ class Sample
         float value;
 };
 
-#ifndef NO_PREEMP
-class PreEmphasis
-{
-    public:
-        PreEmphasis(uint32_t sampleRate);
-        float filter(float value);
-    protected:
-        float timeConst, prevValue;
-};
-#endif
-
 #endif // SAMPLE_HPP

transmitter.cpp

@@ -174,7 +174,7 @@ uint32_t Transmitter::getPeripheralPhysAddress(volatile void *object) const
     return PERIPHERALS_PHYS_BASE + (reinterpret_cast<uint32_t>(object) - reinterpret_cast<uint32_t>(peripherals));
 }
 
-uint32_t Transmitter::getPeripheralVirtAddress(uint32_t offset) const
+uint32_t Transmitter::getPeripheralVirtAddress(uint32_t offset)
 {
     return reinterpret_cast<uint32_t>(peripherals) + offset;
 }
@@ -379,18 +379,12 @@ void Transmitter::transmitViaDma(WaveReader &reader, uint32_t bufferSize, uint8_
     volatile PWMRegisters *pwm = initPwmController();
 
     uint32_t i, cbOffset = 0;
-#ifndef NO_PREEMP
-    PreEmphasis preEmphasis(sampleRate);
-#endif
 
     volatile DMAControllBlock *dmaCb = reinterpret_cast<DMAControllBlock *>(dmaMemory.virtualBase);
     volatile uint32_t *clkDiv = reinterpret_cast<uint32_t *>(reinterpret_cast<uint32_t>(dmaCb) + 2 * sizeof(DMAControllBlock) * bufferSize);
     volatile uint32_t *pwmFifoData = reinterpret_cast<uint32_t *>(reinterpret_cast<uint32_t>(clkDiv) + sizeof(uint32_t) * bufferSize);
     for (i = 0; i < bufferSize; i++) {
         float value = samples[i].getMonoValue();
-#ifndef NO_PREEMP
-        value = preEmphasis.filter(value);
-#endif
         clkDiv[i] = (0x5A << 24) | (clockDivisor - static_cast<int32_t>(round(value * divisorRange)));
         dmaCb[cbOffset].transferInfo = (0x01 << 26) | (0x01 << 3);
         dmaCb[cbOffset].srcAddress = getMemoryPhysAddress(dmaMemory, &clkDiv[i]);
@@ -437,9 +431,6 @@ void Transmitter::transmitViaDma(WaveReader &reader, uint32_t bufferSize, uint8_
             eof = samples.size() < bufferSize;
             for (i = 0; i < samples.size(); i++) {
                 float value = samples[i].getMonoValue();
-#ifndef NO_PREEMP
-                value = preEmphasis.filter(value);
-#endif
                 while (i == ((dma->cbAddress - getMemoryPhysAddress(dmaMemory, dmaCb)) / (2 * sizeof(DMAControllBlock)))) {
                     std::this_thread::sleep_for(std::chrono::microseconds(1000));
                 }
@@ -456,10 +447,6 @@ void Transmitter::transmitViaDma(WaveReader &reader, uint32_t bufferSize, uint8_
 
 void Transmitter::transmitThread()
 {
-#ifndef NO_PREEMP
-    PreEmphasis preEmphasis(sampleRate);
-#endif
-
     volatile TimerRegisters *timer = reinterpret_cast<TimerRegisters *>(getPeripheralVirtAddress(TIMER_BASE_OFFSET));
     uint64_t current = *(reinterpret_cast<volatile uint64_t *>(&timer->low));
     uint64_t playbackStart = current;
@@ -483,7 +470,7 @@ void Transmitter::transmitThread()
             unlock();
             break;
         }
-        std::vector<Sample> loaded(std::move(samples));
+        std::vector<Sample> loaded = std::move(samples);
         unlock();
 
         sampleOffset = (current - playbackStart) * sampleRate / 1000000;
@@ -495,9 +482,6 @@ void Transmitter::transmitThread()
             }
             uint32_t prevOffset = offset;
             float value = loaded[offset].getMonoValue();
-#ifndef NO_PREEMP
-            value = preEmphasis.filter(value);
-#endif
             output->div = (0x5A << 24) | (clockDivisor - static_cast<int32_t>(round(value * divisorRange)));
             while (offset == prevOffset) {
                 std::this_thread::sleep_for(std::chrono::microseconds(1)); // asm("nop");

transmitter.hpp

@@ -46,7 +46,7 @@ struct ClockRegisters;
 class Transmitter
 {
     public:
-        virtual ~Transmitter();
+        ~Transmitter();
         Transmitter(const Transmitter &) = delete;
         Transmitter(Transmitter &&) = delete;
         Transmitter &operator=(const Transmitter &) = delete;
@@ -59,7 +59,7 @@ class Transmitter
         uint32_t getPeripheralsSize() const;
         float getSourceFreq() const;
         uint32_t getPeripheralPhysAddress(volatile void *object) const;
-        static uint32_t getPeripheralVirtAddress(uint32_t offset) const;
+        static uint32_t getPeripheralVirtAddress(uint32_t offset);
         uint32_t getMemoryPhysAddress(AllocatedMemory &memory, volatile void *object) const;
         AllocatedMemory allocateMemory(uint32_t size);
         void freeMemory(AllocatedMemory &memory);

wave_reader.cpp

@@ -144,7 +144,7 @@ std::vector<Sample> WaveReader::getSamples(uint32_t quantity, bool &continueFlag
         quantity = bytesToRead / bytesPerSample;
     }
 
-    std::vector<uint8_t> data(std::move(readData(bytesToRead, false, continueFlag)));
+    std::vector<uint8_t> data = std::move(readData(bytesToRead, false, continueFlag));
     if (data.size() < bytesToRead) {
         quantity = data.size() / bytesPerSample;
     }