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#include <gtk/gtk.h>
#include <cairo/cairo.h>
#include <portaudio.h>
int device = -1;
typedef struct {
float left;
float right;
} AudioData;
AudioData audiodata;
struct data {
int device_num;
};
PaStream *stream = NULL;
GtkWidget *drawing_area;
#define FRAMES_PER_BUFFER 256
int patestCallback(const void *inputBuffer, void *outputBuffer, unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo *timeInfo, PaStreamCallbackFlags statusFlags, void *userData)
{
AudioData *data = (AudioData *)userData;
float *in = (float *)inputBuffer;
if (data->left > 0) {
data->left -= 0.005;
}
if (data->right > 0) {
data->right -= 0.005;
}
for (unsigned long i = 0; i < framesPerBuffer * 2; i += 2) {
data->left = MAX(data->left, fabs(in[i]));
data->right = MAX(data->right, fabs(in[i + 1]));
}
if (drawing_area) {
gtk_widget_queue_draw(GTK_WIDGET(drawing_area));
}
return 0;
}
static void select_device(GtkWidget *widget, gpointer data)
{
struct data *d = (struct data *)data;
device = d->device_num;
printf("Device %d selected\n", d->device_num);
PaStreamParameters inputParameters;
memset(&inputParameters, 0, sizeof(inputParameters));
inputParameters.channelCount = 2;
inputParameters.device = device;
inputParameters.hostApiSpecificStreamInfo = NULL;
inputParameters.sampleFormat = paFloat32;
inputParameters.suggestedLatency = Pa_GetDeviceInfo(device)->defaultLowInputLatency;
Pa_OpenStream(&stream, &inputParameters, NULL, Pa_GetDeviceInfo(device)->defaultSampleRate, FRAMES_PER_BUFFER, paNoFlag, patestCallback, &audiodata);
Pa_StartStream(stream);
}
static void draw(cairo_t *cr, GtkWidget *area)
{
cairo_set_source_rgba(cr, 1, 0, 0, 1);
cairo_arc(cr, 250, 250, audiodata.left * 250, 0, 2 * M_PI);
cairo_arc(cr, 800, 250, audiodata.right * 250, 0, 2 * M_PI);
cairo_fill(cr);
gtk_widget_queue_draw(area);
}
static void draw_cb(GtkDrawingArea *drawing_area, cairo_t *cr, int width, int height, gpointer data)
{
cairo_paint(cr);
draw(cr, data);
}
static void refresh()
{
}
static void activate(GtkApplication *app, gpointer user_data)
{
GtkWidget *window;
GtkWidget *grid;
GtkWidget *button;
// init window
window = gtk_application_window_new(app);
gtk_window_set_title(GTK_WINDOW(window), "Directional Audio Visualizer");
// init grid
grid = gtk_grid_new();
gtk_window_set_child(GTK_WINDOW(window), grid);
// init drawing_area
drawing_area = gtk_drawing_area_new();
gtk_widget_set_size_request(drawing_area, 1050, 500);
gtk_drawing_area_set_draw_func(GTK_DRAWING_AREA(drawing_area), draw_cb, drawing_area, NULL);
gtk_grid_attach(GTK_GRID(grid), drawing_area, 1, 2, 100, 100);
// init audio devices
Pa_Initialize();
int numDevices = Pa_GetDeviceCount();
if (numDevices < 0) {
printf("Error getting device count.\n");
exit(EXIT_FAILURE);
} else if (numDevices == 0) {
printf("There are no available audio devices on this machine.\n");
exit(EXIT_SUCCESS);
}
// init button for every audio device
for (int i = 0; i < numDevices; i++) {
const PaDeviceInfo *deviceInfo = Pa_GetDeviceInfo(i);
struct data *d = malloc(sizeof(struct data));
d->device_num = i;
button = gtk_button_new_with_label(deviceInfo->name);
g_signal_connect(button, "clicked", G_CALLBACK(select_device), d);
gtk_grid_attach(GTK_GRID(grid), button, 0, numDevices - i - 1, 1, 1);
}
// init button for refresh
button = gtk_button_new_with_label("Refresh");
g_signal_connect_swapped(button, "clicked", G_CALLBACK(refresh), window);
gtk_grid_attach(GTK_GRID(grid), button, 1, 0, 1, 1);
// init button for quit
button = gtk_button_new_with_label("Quit");
g_signal_connect_swapped(button, "clicked", G_CALLBACK(gtk_window_destroy), window);
gtk_grid_attach(GTK_GRID(grid), button, 1, 1, 1, 1);
// set window
gtk_window_present(GTK_WINDOW(window));
}
int main(int argc, char **argv)
{
GtkApplication *app;
int status;
app = gtk_application_new("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
g_signal_connect(app, "activate", G_CALLBACK(activate), NULL);
status = g_application_run(G_APPLICATION(app), argc, argv);
g_object_unref(app);
return status;
}
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