void drawAudioBuffer( const audio::Buffer &buffer, const Rectf &bounds, bool drawFrame, const ci::ColorA &color )
{
gl::ScopedGlslProg glslScope( getStockShader( gl::ShaderDef().color() ) );
gl::color( color );
const float waveHeight = bounds.getHeight() / (float)buffer.getNumChannels();
const float xScale = bounds.getWidth() / (float)buffer.getNumFrames();
float yOffset = bounds.y1;
for( size_t ch = 0; ch < buffer.getNumChannels(); ch++ ) {
PolyLine2f waveform;
const float *channel = buffer.getChannel( ch );
float x = bounds.x1;
for( size_t i = 0; i < buffer.getNumFrames(); i++ ) {
x += xScale;
float y = ( 1 - ( channel[i] * 0.5f + 0.5f ) ) * waveHeight + yOffset;
waveform.push_back( vec2( x, y ) );
}
if( ! waveform.getPoints().empty() )
gl::draw( waveform );
yOffset += waveHeight;
}
if( drawFrame ) {
gl::color( color.r, color.g, color.b, color.a * 0.6f );
gl::drawStrokedRect( bounds );
}
}
void _TBOX_PREFIX_App::drawPcmData()
{
if ( mPcmBuffer.isEmpty() )
return;
// draw the first(left) channel in the PCM buffer
// getData() returns a pointer to the first sample in the buffer
uint32_t bufferLength = mPcmBuffer.getSize() / mPcmBuffer.getNumChannels();
float *leftBuffer = mPcmBuffer.getData();
int displaySize = getWindowWidth();
float scale = displaySize / (float)bufferLength;
PolyLine<Vec2f> leftBufferLine;
gl::color( Color::gray( 0.4f ) );
for( int i = 0; i < bufferLength; i++ )
{
float x = i * scale;
float y = 50 + leftBuffer[i] * 60;
leftBufferLine.push_back( Vec2f( x , y) );
}
gl::draw( leftBufferLine );
}