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Add method for getting raw samples from InputSource

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Mike Walters
2015-08-01 20:55:12 +01:00
parent bc41fa5e02
commit 35bd613d0d
2 changed files with 12 additions and 0 deletions
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10
inputsource.cpp
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@@ -17,6 +17,7 @@ InputSource::InputSource(const char *filename, int fft_size) {
if (fstat(fileno(m_file), &sb) != 0)
throw std::runtime_error("Error fstating file");
m_file_size = sb.st_size;
sampleCount = m_file_size / sizeof(fftwf_complex);
m_data = (fftwf_complex*)mmap(NULL, m_file_size, PROT_READ, MAP_SHARED, fileno(m_file), 0);
if (m_data == 0)
@@ -37,6 +38,15 @@ void InputSource::cleanupFFTW() {
if (m_fftw_out != nullptr) fftwf_free(m_fftw_out);
}
bool InputSource::getSamples(fftwf_complex *dest, int start, int length)
{
if (start + length >= sampleCount)
return false;
memcpy(dest, &m_data[start], length * sizeof(fftwf_complex));
return true;
}
void InputSource::getViewport(float *dest, int x, int y, int width, int height, int zoom) {
fftwf_complex *sample_ptr = &m_data[y * getFFTStride()];