[SOLVED] ca_context_cancel() doesn't stop sound

vampireixon · 04-11-2018, 11:17 AM

Cound some body help?
I have that problem.
I start a sound calling:
ca_context_play (mContext, 2, CA_PROP_MEDIA_FILENAME, "MySound.wav", NULL);

If I call:
ca_context_playing(mContext,2,&_isPlaying);
_isPlaying is 1.

Then I call:
ca_context_cancel(mContext,2);
and the sound doesn't stops. But if I call again:
ca_context_playing(mContext,2,&_isPlaying);
_isPlaying is 0.

Thanks.

norobro · 04-12-2018, 01:09 PM

Please surround your code with code tags: [code]place code here[/code]

Does the following work?

Code:

#include <glib.h>
#include <canberra-gtk.h>
#include <stdio.h>

int main () {
    ca_context * contx;
    ca_context_create (&contx);
    ca_context_play(contx, 1, CA_PROP_MEDIA_FILENAME, 
            "/usr/share/sounds/alsa/Front_Center.wav", NULL);
    int isPlaying;
    ca_context_playing(contx, 1, &isPlaying);
    printf("%d\n", isPlaying);
    g_usleep (750000);
    ca_context_cancel(contx, 1);
    g_usleep(1000000); // delay to make sure cancel works v. program termination
    return 0;
}

Assuming you have that wav file, a pleasing female voice should say "front" in lieu of "front center".

If it does work we probably need to see more code in order to help.

vampireixon · 04-13-2018, 04:18 AM

Hi norobro. Thank you very much for your fast response.
I've tested your code and it don't works.
I've added this line:

Code:

 
    ca_context_create (&contx);

<-- your code

Code:

   int ret;
   if ((ret = ca_context_set_driver(contx, "alsa"))){
	printf((char*)"error 0x%2.2x ",ret);
   }

<-- line added

with this line the sound was played, but it didn't stop until the program is finnished. So

Code:

ca_context_cancel(contx, 1);

does noting.

This is my whole code:

Code:

#include <glib.h>
#include <canberra-gtk.h>
#include <stdio.h>

int main () {
	int ret;
    int isPlaying = 0;
    ca_context * contx;
    ca_context_create (&contx);
	if ((ret = ca_context_set_driver(contx, "alsa"))){
		printf((char*)"Error 0x%2.2X",ret);
	}
    ret = ca_context_play(contx, 1, CA_PROP_MEDIA_FILENAME,
            "/home/SND/TEST.WAV", NULL);
    if (ret) isPlaying = 1;
    ca_context_playing(contx, 1, &isPlaying);
    printf("%d\n", isPlaying);
    usleep (750000);
    ca_context_cancel(contx, 1);
    usleep(1000000); // delay to make sure cancel works v. program termination
    return 0;    // with a breakpoint in this line sound never stops
}

keefaz · 04-13-2018, 07:04 AM

Maybe check return value for ca_context_cancel()

Code:

...
ret = ca_context_cancel(contx, 1);
fprintf(stderr, "cancel: %s\n", ca_strerror(ret));
...

Edit, also you don't destroy the context object at the end of the program...

Code:

...
usleep(1000000); // or sleep(1); 
ret = ca_context_destroy(contx);
fprintf(stderr, "destroy: %s\n", ca_strerror(ret));

vampireixon · 04-13-2018, 09:39 AM

Thanks again for your help.
new code.

Code:

int main () {
	int ret;
    int isPlaying = 0;
    ca_context * contx;
    ca_context_create (&contx);
	if ((ret = ca_context_set_driver(contx, "alsa"))){
		printf((char*)"Error 0x%2.2X",ret);
	}
    ret = ca_context_play(contx, 1, CA_PROP_MEDIA_FILENAME,
            "/usr/share/sounds/alsa/Front_Center.wav", NULL);
    if (ret) isPlaying = 1;
    ret = ca_context_playing(contx, 1, &isPlaying);
    printf("IsPlaying:%d   ret:%d\n", isPlaying,ret);
    usleep (750000);
    ca_context_cancel(contx, 1);
    ret = ca_context_playing(contx, 1, &isPlaying);
    printf("IsPlaying:%d   ret:%d\n", isPlaying,ret);
    usleep(1000000); // delay to make sure cancel works v. program termination
    return 0;
}

output console:
IsPlaying:1 ret:0
IsPlaying:0 ret:0

But Sound doesn't stop

If you wanna test like me should :
-add these libpaths:
/usr/lib
/usr/lib/x86_64-linux-gnu
-add these libraries:
canberra
-and add these includes:
/usr/include
/usr/include/glib-2.0
/usr/lib/x86_64-linux-gnu/glib-2.0/include
/usr/include/gtk-3.0
/usr/include/pango-1.0
/usr/include/cairo
/usr/include/gdk-pixbuf-2.0
/usr/include/atk-1.0

norobro · 04-13-2018, 11:18 AM

What distribution are you running?

Have you tried setting the driver to "pulse"? On Ubuntu 18.04 ca_context_cancel does not work with the "alsa" driver but does work with "pulse".

keefaz · 04-13-2018, 11:23 AM

@vampireixon, Could you test with the code I posted?

vampireixon · 04-13-2018, 12:32 PM

Hi norobro.
I've checked it and you are rigth. With pulse it works fine. Thx
Keefaz.
If you look at my last code you'll see your 1st piece of code and the console output.
I can't use the 2nd one piece because if I have any other sound playing it will be stopped too. I only want to stop one sound.
Thx any way for your help.

All of you are so kind helping people.