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#include <signal.h>
#include <gtkmm.h>
#include <polyp/polyplib-context.h>
#include <polyp/polyplib-stream.h>
#include <polyp/glib-mainloop.h>
class MainWindow : public Gtk::Window {
public:
MainWindow(unsigned chan);
virtual ~MainWindow();
protected:
class ChannelInfo {
public:
ChannelInfo(MainWindow &w, const Glib::ustring &l);
Gtk::Label *label;
Gtk::ProgressBar *progress;
};
Gtk::Table table;
std::vector<ChannelInfo*> channels;
virtual void addChannel(const Glib::ustring &l);
public:
virtual void pushData(const float *d, size_t l);
};
MainWindow::MainWindow(unsigned nchan) :
Gtk::Window(),
table(1, 2) {
g_assert(nchan > 0);
set_border_width(12);
set_title("Volume Meter");
table.set_row_spacings(6);
table.set_col_spacings(12);
add(table);
if (nchan == 2) {
addChannel("<b>Left:</b>");
addChannel("<b>Right:</b>");
} else if (nchan == 1)
addChannel("<b>Level:</b>");
else {
for (unsigned i = 1; i <= nchan; i++) {
char t[40];
snprintf(t, sizeof(t), "<b>Channel #%u:</b>", i);
addChannel(t);
}
}
g_assert(channels.size() == nchan);
show_all();
}
MainWindow::~MainWindow() {
while (channels.size() > 0) {
ChannelInfo *i = channels.back();
channels.pop_back();
delete i;
}
}
void MainWindow::addChannel(const Glib::ustring &l) {
channels.push_back(new ChannelInfo(*this, l));
}
MainWindow::ChannelInfo::ChannelInfo(MainWindow &w, const Glib::ustring &l) {
label = Gtk::manage(new Gtk::Label(l, 1.0, 0.5));
label->set_markup(l);
progress = Gtk::manage(new Gtk::ProgressBar());
progress->set_fraction(0.5);
w.table.resize(w.channels.size()+1, 2);
w.table.attach(*label, 0, 1, w.channels.size(), w.channels.size()+1, Gtk::FILL, (Gtk::AttachOptions) 0);
w.table.attach(*progress, 1, 2, w.channels.size(), w.channels.size()+1, Gtk::EXPAND|Gtk::FILL, (Gtk::AttachOptions) 0);
}
void MainWindow::pushData(const float *d, unsigned samples) {
float *max;
unsigned nchan = channels.size();
max = (float*) g_malloc(sizeof(float)*nchan);
g_assert(max);
for (unsigned c = 0; c < nchan; c++)
max[c] = 0;
while (samples >= nchan) {
for (unsigned c = 0; c < nchan; c++) {
float v = fabs(d[c]);
if (v > max[c])
max[c] = v;
}
d += nchan;
samples -= nchan;
}
for (unsigned c = 0; c < nchan; c++) {
ChannelInfo *i = channels[c];
i->progress->set_fraction(max[c]);
}
g_free(max);
}
static MainWindow *mainWindow = NULL;
static struct pa_context *context = NULL;
static struct pa_stream *stream = NULL;
static const struct pa_sample_spec sample_spec = {
PA_SAMPLE_FLOAT32, 44100, 2
};
static void stream_read_callback(struct pa_stream *, const void *p, size_t l, void *) {
g_assert(mainWindow);
/* mainWindow->pushData((const float*) p, l/sizeof(float));*/
}
static void stream_state_callback(struct pa_stream *s, void *) {
switch (pa_stream_get_state(s)) {
case PA_STREAM_DISCONNECTED:
case PA_STREAM_CREATING:
break;
case PA_STREAM_READY:
g_assert(!mainWindow);
mainWindow = new MainWindow(sample_spec.channels);
break;
case PA_STREAM_FAILED:
case PA_STREAM_TERMINATED:
Gtk::Main::quit();
}
}
static void context_state_callback(struct pa_context *c, void *) {
switch (pa_context_get_state(c)) {
case PA_CONTEXT_UNCONNECTED:
case PA_CONTEXT_CONNECTING:
case PA_CONTEXT_AUTHORIZING:
case PA_CONTEXT_SETTING_NAME:
break;
case PA_CONTEXT_READY:
g_assert(!stream);
stream = pa_stream_new(c, "vumeter", &sample_spec);
pa_stream_set_state_callback(stream, stream_state_callback, NULL);
pa_stream_set_read_callback(stream, stream_read_callback, NULL);
pa_stream_connect_record(stream, "input", NULL);
break;
case PA_CONTEXT_TERMINATED:
case PA_CONTEXT_FAILED:
Gtk::Main::quit();
}
}
int main(int argc, char *argv[]) {
struct pa_glib_mainloop *m;
signal(SIGPIPE, SIG_IGN);
Gtk::Main kit(argc, argv);
m = pa_glib_mainloop_new(g_main_context_default());
g_assert(m);
context = pa_context_new(pa_glib_mainloop_get_api(m), "vumeter");
g_assert(m);
pa_context_set_state_callback(context, context_state_callback, NULL);
pa_context_connect(context, NULL);
Gtk::Main::run();
if (stream)
pa_stream_unref(stream);
if (context)
pa_context_unref(context);
if (mainWindow)
delete mainWindow;
pa_glib_mainloop_free(m);
return 0;
}
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