Sound troubles

Sound troubles

DavyKager

Member #8,299

February 2007

Hi!

Last month I downloaded and installed Allegro, and it must been said that it's really cool! However, I'm stuck on how to let my sounds play. Maybe someone here can help me?

I'm trying to build an audiogame, which is my first project, so I'm not used to work with Allegro and C++. I get the keyboard input in a while-loop. That works great, but in this case the sounds are in the while-loop too. And that cause them to constantly restart on every loop...

Can anyone please give me some hints or tips how to deal with this?
Thanks in advance!

Johan Halmén

Member #1,550

September 2001

Show some code.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Years of thorough research have revealed that the red "x" that closes a window, really isn't red, but white on red background.

Years of thorough research have revealed that what people find beautiful about the Mandelbrot set is not the set itself, but all the rest.

Arthur Kalliokoski

Second in Command

February 2005

I think you'd want this
http://www.allegro.cc/manual/api/digital-sample-routines/voice-control/voice_get_position
in your loop.

They all watch too much MSNBC... they get ideas.

DavyKager

Member #8,299

February 2007

Well, let me give some example code. Assume that I've loaded a sample and initialized Allegro before.
while (!key[KEY_ESC]) {
if (x >= 50) {
play_sample(the_sample, 255, 128, 1000, FALSE);
}
}

This will start a new sample every loop, which is of course not the thing I wanted to do.

I know that there are some sounds in the Allegro demo game, but I can't find out how it all works.

ngiacomelli

Member #5,114

October 2004

Quote:

which is of course not the thing I wanted to do.

A quick look at the manual here at Allegro.cc shows that play_sample is used in exsample.c (which can be found in your allegro examples folder). Here's a snippet that sould make everything clear:

 play_sample(the_sample, 255, pan, pitch, TRUE);
2 
 do {
    poll_keyboard();
5 
    /* alter the pan position? */
    if ((key[KEY_LEFT]) && (pan > 0))
 pan--;
    else if ((key[KEY_RIGHT]) && (pan < 255))
 pan++;
11 
    /* alter the pitch? */
    if ((key[KEY_UP]) && (pitch < 16384))
 pitch = ((pitch * 513) / 512) + 1; 
    else if ((key[KEY_DOWN]) && (pitch > 64))
 pitch = ((pitch * 511) / 512) - 1; 
17 
    /* adjust the sample */
    adjust_sample(the_sample, 255, pan, pitch, TRUE);
20 
    /* delay a bit */
    rest(2);
23 
 } while ((!key[KEY_ESC]) && (!key[KEY_SPACE]));
25 
 /* destroy the sample */
 destroy_sample(the_sample);

DavyKager

Member #8,299

February 2007

That's cool, but then I have to start all my samples at volume 0 and adjust them later when they're needed. And since it's an audiogame, that would be loads of sounds.

Thomas Fjellstrom

Member #476

June 2000

or you have a list/array of your playing sounds, and use adjust_sample on the ones you want to change at any given time.

--
Thomas Fjellstrom - [website] - [email] - [Allegro Wiki] - [Allegro TODO]
"If you can't think of a better solution, don't try to make a better solution." -- weapon_S
"The less evidence we have for what we believe is certain, the more violently we defend beliefs against those who don't agree" -- https://twitter.com/neiltyson/status/592870205409353730

Ariesnl

Member #2,902

November 2002

use FMOD.. it's free if you're not gonna make money

Perhaps one day we will find that the human factor is more complicated than space and time (Jean luc Picard)
Current project: [Star Trek Project ] Join if you want ;-)

Thomas Fjellstrom

Member #476

June 2000

How does FMOD help? He's asking a rather basic question about how to use sounds...

Johan Halmén

Member #1,550

September 2001

Your problem is not related to sound functions. It is related to program logic. You have a thing you want to do once, not every loop. No matter if it is a sound or drawing a rectangle or whatnot. Set a flag when you play the sound. Check if flag is set before you try to play the sound again. If you don't get it, try to deal with simpler program logic first.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Years of thorough research have revealed that the red "x" that closes a window, really isn't red, but white on red background.

Years of thorough research have revealed that what people find beautiful about the Mandelbrot set is not the set itself, but all the rest.

DavyKager

Member #8,299

February 2007

I was already thinking about using a flag, but I didn't see that in the demos/examples, so I thought there was another way.

Audric

Member #907

January 2001

See Voice control in the manual, this is the API to control more finely the sounds while they are being played.
For example: You can reserve one voice for a looping sound, start or stop the sample in this voice anytime, and adjust the volume/pitch/panning depending on game elements.

ImLeftFooted

Member #3,935

October 2003

Sounds::loop("engine sound");

Sounds::PlayInfo pi;

pi.pan = 0.5;
pi.vol = 1.0;
pi.frequency = 1.0;

Sounds::adjust("engine sound", pi);

How is my posting?