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Topic: callback for timecode? (Read 1984 times) previous topic - next topic
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callback for timecode?

Hello,
the callback virtual void FB2KAPI on_playback_time(double p_time) = 0; in play_callback.h
is every second. Is there also a callback every 10 or 100 Milliseconds? I want to build a Timecode output.

Günter

Re: callback for timecode?

Reply #1 –
The callback as you've noticed ticks at 1Hz and there is not any alternative to my knowledge.
In my foo_wave_seekbar component I poll the playback position on a WM_TIMER message as I draw at a particular rate anyway.
Code: [Select]
static_api_ptr_t<playback_control> pc;
double t = pc->playback_get_position();

It's worth noting that the times you get from the playback callback and the times you get from playback_get_position are not quite in sync, if you gather information from both you'll get hitches every second so I recommend only using one of the alternatives.
Stay sane, exile.

Re: callback for timecode?

Reply #2 –
Hello Zao,

thank you for your help!!!
Whats the lag of your Timer?

Edit: Is playback_get_position only in seconds???

Quote:
virtual double    playback_get_position ()=0
Returns current playback position within currently played track, in seconds.

I have installed your seekbar and it works fine. It is possible to start (or better pause) a stopped only by clicking on the waveform (set the cursor)?

Günter

Re: callback for timecode?

Reply #4 –
Hello marc2003,

thank for your help!
So i try to write a component which calls playback_get_position every 10 milliseconds and write the value to an serial Port.
2 decimal places are enough..

regards,
Günter

Re: callback for timecode?

Reply #5 –
Hello Zao,

how did you get access to the WMTimer?
I cant start the Timer...

Günter

Re: callback for timecode?

Reply #6 –
Hello,

the timer is running. But it has an Jitter when the song is played.

Code: [Select]
class myinitquit : public initquit {
public:
	void on_init() {
		console::print("Sample component: on_init()");
		a.connect();
		HWND w = core_api::get_main_window();
		SetTimer(w, 12, 100, (TIMERPROC)&winproc);
	}

Code: [Select]
static LRESULT CALLBACK winproc(HWND wnd, UINT msg, WPARAM wp, LPARAM lp)
{
	
	switch (msg)
	{
	case WM_TIMER:
		if (wp == 12)
		{
			static_api_ptr_t<playback_control> pc;
			unsigned long long t = abs(pc->playback_get_position()*10);
			a.send(t); 
		}
		break;

	case WM_DESTROY:

		return 0;
	}

	return uDefWindowProc(wnd, msg, wp, lp);
}

Re: callback for timecode?

Reply #7 –
Hello,

now i used the callback: virtual void FB2KAPI on_playback_time(double p_time) = 0;

This is also very unaccurate...
There is no callback at 0 Seconds.

Günter

Re: callback for timecode?

Reply #8 –
Wellcome to my Timeblog.

Code: [Select]
void on_playback_starting(play_control::t_track_command p_command, bool p_paused) {
		ComPort.send(0);
	}
	void on_playback_time(double p_time) {
		unsigned long long t = (unsigned long long)abs(p_time);
		if (t == 1)ComPort.send(t);
	}

The time between playback_starting and the first on_playback_time tick is between 1,2 and 1,4 Seconds. :o


Re: callback for timecode?

Reply #9 –
Time between release of the Playbutton (measured at the left Mouseswitch) , the on_playback_starting callback to an Comport is only 10-20 Milliseconds. :)

Re: callback for timecode?

Reply #10 –
Hello,

on_playback_starting
on_playback_time
on_playback_seek

works fine

on_playback_pause
on_playback_stop
on_volume_change

nothing happens

is something wrong with my code?

Code: [Select]
class play_callback_changes : public play_callback_static
{
	void on_playback_new_track(metadb_handle_ptr p_track) {
	}

	void on_playback_stop(play_control::t_stop_reason p_reason) {
		ComPort.send(1);//no event
	}

	void on_playback_dynamic_info_track(const file_info & p_info) {
	}

	void on_playback_edited(metadb_handle_ptr p_track) {
	}

	void on_playback_starting(play_control::t_track_command p_command, bool p_paused) {
		ComPort.send(2);//OK
	}
	void on_playback_time(double p_time) {
		//unsigned long long t = (unsigned long long)abs(p_time*100);
		ComPort.send(3);//OK
	}

	void on_playback_seek(double p_time) {
		ComPort.send(4);//OK
	}

	void on_playback_pause(bool p_state) {
		ComPort.send(5);//no event
	}

	void on_playback_dynamic_info(const file_info & p_info) {
	}

	void on_volume_change(float p_new_val) {
		ComPort.send(6);//no event
	}

	unsigned int get_flags() {
		return flag_on_playback_new_track
			| flag_on_playback_edited
			| flag_on_playback_starting
			| flag_on_playback_seek
			| flag_on_playback_time
			;
	}
};

static play_callback_static_factory_t<play_callback_changes> g_play_callback_changes;

Re: callback for timecode?

Reply #11 –
Check your get_flags() ??

Re: callback for timecode?

Reply #12 –
yes, the flags will help!  :D

Re: callback for timecode?

Reply #13 –
So i will poll playback_get_position with a wm_timer all 10 ms to get the nearest startpoint of the soundfile. This startpoint go to an external mikrocontroller which generates the Miditimecode from an accurate clock, On_playback_pause and on_playback_stop will also set the external clock.

thanks for the help!
Günter