void
AnalyserNode::GetFloatFrequencyData(const Float32Array& aArray)
{
if (!FFTAnalysis()) {
// Might fail to allocate memory
return;
}
float* buffer = aArray.Data();
uint32_t length = std::min(aArray.Length(), mOutputBuffer.Length());
for (uint32_t i = 0; i < length; ++i) {
buffer[i] = WebAudioUtils::ConvertLinearToDecibels(mOutputBuffer[i], mMinDecibels);
}
}
void
AnalyserNode::GetByteFrequencyData(const Uint8Array& aArray)
{
if (!FFTAnalysis()) {
// Might fail to allocate memory
return;
}
const double rangeScaleFactor = 1.0 / (mMaxDecibels - mMinDecibels);
unsigned char* buffer = aArray.Data();
uint32_t length = std::min(aArray.Length(), mOutputBuffer.Length());
for (uint32_t i = 0; i < length; ++i) {
const double decibels = WebAudioUtils::ConvertLinearToDecibels(mOutputBuffer[i], mMinDecibels);
// scale down the value to the range of [0, UCHAR_MAX]
const double scaled = std::max(0.0, std::min(double(UCHAR_MAX),
UCHAR_MAX * (decibels - mMinDecibels) * rangeScaleFactor));
buffer[i] = static_cast<unsigned char>(scaled);
}
}
double ReadData()
{
//Return if audio input is null
if(!m_audioInput)
return 0;
//Check the number of samples in input buffer
qint64 len = m_audioInput->bytesReady();
if(len >= BufferSize/2)
{
// printf("bytesReady = %lld \n", len);
m_buffer.resize(len);
//Read sound samples from input device to buffer
qint64 ret = m_input->read(m_buffer.data(), len);
// printf("bytesReady = %lld, byte_read = %lld\n", len, ret);
//Assign sound samples to short array
short* data = (short*)m_buffer.data();
m_output->write((char*)data, ret); // play sound!!
int word_read = ret/sizeof(short);
double* result = (double*)malloc(sizeof(double)*len);
int i;
// for (i=0; i < word_read; i++)
// {
// data[i] = data[i]; // можно менять громкость с микро))
// if (data[i]/35000.0 < 0.105)
// {
// data[i] = 0;
// }
// }
qint64 len2 = 1024;
while (2*len2 <= word_read)
{
len2 = 2*len2;
}
// printf("len2 = %lld\n", len2);
double* data2 = (double*)malloc(sizeof(double)*len2);
for (i=0; i < len2; i++)
{
data2[i] = data[i]/35000.0; // а прост) честно я не знаю нафига я это сделал. Мне маленькие числа нравятся больше)))
}
FFTAnalysis(data2, result, len2, len2);
// FILE *f = fopen("spectrum.txt", "w");
double max = 0;
double maxi = -1;
for(i=0; i<len2/2; i++)
{
// fprintf(f, "%d %lf %lf\n", data[i], data2[i], result[i]);
if(max < result[i])
{
max = result[i];
maxi = i;
}
}
// fclose(f);
printf("%lf %lf \n", max, maxi*SampleRate/len2);
free(data2);
free(result);
// m_audioOutput->stop();
// m_audioInput->stop();
// m_output= m_audioOutput->start();
// m_input = m_audioInput->start();
return max;
}
return 0;
}
