Function writeTestAudioFile

tests/FileWritingTests.cpp:14–116

// Returns true if it was successful
template <typename T>
void writeTestAudioFile (int numChannels, int sampleRate, int bitDepth, AudioFileFormat format)
{
    std::string sampleType;
    float sampleRateAsFloat = static_cast<float> (sampleRate);
    
    AudioFile<T> audioFileWriter;
    
    audioFileWriter.setAudioBufferSize (numChannels, sampleRate * 4);
    
    // In the case of an integer representation, this value will be
    T maxValue;
    
    if constexpr (std::is_floating_point<T>::value)
    {
        maxValue = 1;
        sampleType = "floating_point";
    }
    else if constexpr (std::numeric_limits<T>::is_integer)
    {
        if constexpr (std::is_signed_v<T>)
        {
            sampleType = "integer (signed, " + std::to_string (sizeof (T) * 8) + "-bit)";
            maxValue = pow (2, bitDepth - 1) - 1;
        }
        else
        {
            sampleType = "integer (unsigned, " + std::to_string (sizeof (T) * 8) + "-bit)";
            maxValue = pow (2, bitDepth) - 1;
        }
    }

    for (int i = 0; i < audioFileWriter.getNumSamplesPerChannel(); i++)
    {
        T sample;
        
        if constexpr (std::numeric_limits<T>::is_integer && std::is_unsigned_v<T>)
            sample = static_cast<T> (((sin (2. * M_PI * (static_cast<double> (i) / static_cast<double> (sampleRateAsFloat)) * 440.) + 1.) / 2.) * maxValue);
        else
            sample = static_cast<T> (sin (2. * M_PI * (static_cast<double> (i) / static_cast<double> (sampleRateAsFloat)) * 440.) * static_cast<double> (maxValue));
        
        for (int k = 0; k < audioFileWriter.getNumChannels(); k++)
            audioFileWriter.samples[k][i] = sample * static_cast<T> (0.5);
    }
    
    audioFileWriter.setSampleRate (sampleRate);
    audioFileWriter.setBitDepth (bitDepth);

    std::string numChannelsAsString;
    if (numChannels == 1)
        numChannelsAsString = "mono";
    else if (numChannels == 2)
        numChannelsAsString = "stereo";
    else
        numChannelsAsString = std::to_string (numChannels) + " channels";

    std::string bitDepthAsString = std::to_string (bitDepth);
    std::string sampleRateAsString = std::to_string (sampleRate);