static void draw_spectrum( mlt_filter filter, mlt_frame frame, QImage* qimg )
{
mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
mlt_position position = mlt_filter_get_position( filter, frame );
mlt_position length = mlt_filter_get_length2( filter, frame );
mlt_rect rect = mlt_properties_anim_get_rect( filter_properties, "rect", position, length );
if ( strchr( mlt_properties_get( filter_properties, "rect" ), '%' ) ) {
rect.x *= qimg->width();
rect.w *= qimg->width();
rect.y *= qimg->height();
rect.h *= qimg->height();
}
char* graph_type = mlt_properties_get( filter_properties, "type" );
int mirror = mlt_properties_get_int( filter_properties, "mirror" );
int fill = mlt_properties_get_int( filter_properties, "fill" );
double tension = mlt_properties_get_double( filter_properties, "tension" );
QRectF r( rect.x, rect.y, rect.w, rect.h );
QPainter p( qimg );
if( mirror ) {
// Draw two half rectangle instead of one full rectangle.
r.setHeight( r.height() / 2.0 );
}
setup_graph_painter( p, r, filter_properties );
setup_graph_pen( p, r, filter_properties );
int bands = mlt_properties_get_int( filter_properties, "bands" );
if ( bands == 0 ) {
// "0" means match rectangle width
bands = r.width();
}
float* spectrum = (float*)mlt_pool_alloc( bands * sizeof(float) );
convert_fft_to_spectrum( filter, frame, bands, spectrum );
if( graph_type && graph_type[0] == 'b' ) {
paint_bar_graph( p, r, bands, spectrum );
} else {
paint_line_graph( p, r, bands, spectrum, tension, fill );
}
if( mirror ) {
// Second rectangle is mirrored.
p.translate( 0, r.y() * 2 + r.height() * 2 );
p.scale( 1, -1 );
if( graph_type && graph_type[0] == 'b' ) {
paint_bar_graph( p, r, bands, spectrum );
} else {
paint_line_graph( p, r, bands, spectrum, tension, fill );
}
}
mlt_pool_release( spectrum );
p.end();
}
static void draw_waveforms( mlt_filter filter, mlt_frame frame, QImage* qimg, int16_t* audio, int channels, int samples )
{
mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
mlt_position position = mlt_filter_get_position( filter, frame );
mlt_position length = mlt_filter_get_length2( filter, frame );
int show_channel = mlt_properties_get_int( filter_properties, "show_channel" );
int fill = mlt_properties_get_int( filter_properties, "fill" );
mlt_rect rect = mlt_properties_anim_get_rect( filter_properties, "rect", position, length );
if ( strchr( mlt_properties_get( filter_properties, "rect" ), '%' ) ) {
rect.x *= qimg->width();
rect.w *= qimg->width();
rect.y *= qimg->height();
rect.h *= qimg->height();
}
QRectF r( rect.x, rect.y, rect.w, rect.h );
QPainter p( qimg );
setup_graph_painter( p, r, filter_properties );
if ( show_channel == 0 ) // Show all channels
{
QRectF c_rect = r;
qreal c_height = r.height() / channels;
for ( int c = 0; c < channels; c++ )
{
// Divide the rectangle into smaller rectangles for each channel.
c_rect.setY( r.y() + c_height * c );
c_rect.setHeight( c_height );
setup_graph_pen( p, c_rect, filter_properties );
paint_waveform( p, c_rect, audio + c, samples, channels, fill );
}
} else if ( show_channel > 0 ) { // Show one specific channel
if ( show_channel > channels ) {
// Sanity
show_channel = 1;
}
setup_graph_pen( p, r, filter_properties );
paint_waveform( p, r, audio + show_channel - 1, samples, channels, fill );
}
p.end();
}
