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new visualization type: sound wave

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This commit is contained in:
Andrzej Rybczak
2009-09-01 04:33:12 +02:00
parent 102e14529b
commit 1456e47a0b
7 changed files with 55 additions and 6 deletions
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37
src/visualizer.cpp
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@@ -102,6 +102,37 @@ void Visualizer::Update()
if (data < 0) // no data available in fifo
return;
w->Clear(0);
Config.visualizer_use_wave ? DrawSoundWave(buf, data) : DrawFrequencySpectrum(buf, data);
w->Refresh();
}
void Visualizer::SpacePressed()
{
Config.visualizer_use_wave = !Config.visualizer_use_wave;
ShowMessage("Visualization type: %s", Config.visualizer_use_wave ? "Sound wave" : "Frequency spectrum");
}
void Visualizer::DrawSoundWave(int16_t *buf, ssize_t data)
{
const int samples_per_col = data/sizeof(int16_t)/COLS;
const int half_height = MainHeight/2;
*w << fmtAltCharset;
for (int i = 0; i < COLS; ++i)
{
double point_pos = 0;
for (int j = 0; j < samples_per_col; ++j)
point_pos += buf[i*samples_per_col+j];
point_pos /= samples_per_col;
point_pos /= std::numeric_limits<int16_t>::max();
point_pos *= half_height;
*w << XY(i, half_height+point_pos) << '`';
}
*w << fmtAltCharsetEnd;
}
void Visualizer::DrawFrequencySpectrum(int16_t *buf, ssize_t data)
{
// zero old values
std::fill(buf+data/sizeof(int16_t), buf+Samples, 0);
for (unsigned i = 0; i < Samples; ++i)
@@ -113,17 +144,15 @@ void Visualizer::Update()
for (unsigned i = 0; i < FFTResults; ++i)
itsFreqsMagnitude[i] = sqrt(itsOutput[i][0]*itsOutput[i][0] + itsOutput[i][1]*itsOutput[i][1])/1e5*LINES/5;
w->Clear(0);
const int freqs_per_col = FFTResults/COLS /* cut bandwidth a little to achieve better look */ * 4/5;
for (int i = 0; i < COLS; ++i)
{
size_t bar_height = 0;
for (int j = 0; j < freqs_per_col; ++j)
bar_height += itsFreqsMagnitude[i*freqs_per_col+j];
bar_height = std::min(bar_height/freqs_per_col, Global::MainHeight);
mvwvline(w->Raw(), Global::MainHeight-bar_height, i, 0, bar_height);
bar_height = std::min(bar_height/freqs_per_col, MainHeight);
mvwvline(w->Raw(), MainHeight-bar_height, i, 0, bar_height);
}
w->Refresh();
}
void Visualizer::SetFD()