sound problems... again

alex Ioan

read the tutorial but didn't find a good way around this...

sound.cpp

#SelectExpand
  1
  2#include"sound.h"
  3#include <allegro5/allegro.h>  
  4#include <allegro5/allegro_audio.h>  
  5#include <allegro5/allegro_acodec.h>
  6 ALLEGRO_SAMPLE_ID* bkgid;
  7 ALLEGRO_SAMPLE_ID* bkgfid;
  8
  9void sound::startbackmusic()  
 10      {if(musicon==1)
 11  { bkg=al_load_sample("data/bkg.wav"); al_play_sample(bkg,0.55,0,1.0,ALLEGRO_PLAYMODE_LOOP,bkgid);}}
 12
 13
 14void sound::stopbackmusic(int a)
 15    {if(musicon==1)
 16    {al_stop_sample(bkgid);
 17      if (a==1)
 18    {al_destroy_sample(bkg);}
 19      }
 20      }

sound.h

#SelectExpand
  1
  2#pragma once
  3#include <allegro5/allegro.h>
  4#include <allegro5/allegro_audio.h>
  5#include <allegro5/allegro_acodec.h>
  6
  7class sound
  8{ public:      
  9sound():
 10  soundon(1),
 11  musicon(1),
 12
 13  crit(al_load_sample("data/crit.wav")),
 14  deagle(al_load_sample("data/deagle.wav")),
 15        attack(al_load_sample("data/attack.wav"))
 16//loading different sounds
 17    {}
 18 void startbackmusic();
 19 void stopbackmusic(int a);
 20
 21
 22
 23private:
 24
 25ALLEGRO_SAMPLE *bkg;
 26//+ all other
 27int soundon;
 28int musicon;
 29
 30};

so when I call sound.stopbackmusic(1); it just doesnt work, gives me "access violation reading..." and points to "al_stop_sample(bkgid);"

what am I doing wrong here ? :'(

The only work around I can find is to destroy the sample directly.

PS:

simple code in main.cpp

ALLEGRO_SAMPLE_ID * bkgid;
ALLEGRO_SAMPLE *bkg;

bkg=al_load_sample("data/bkg.wav");
al_play_sample(bkg,1.0,0,1.0,ALLEGRO_PLAYMODE_LOOP,bkgid); 
Sleep(1500);
al_stop_sample(bkgid);

tells me that bkgid is not initialized

Trent Gamblin

If I'm not mistaken then you should be passing already allocated ALLEGRO_SAMPLE_IDs. You could change them from pointers to regular variables and pass the address.

alex Ioan

that....worked !

But how could one know about those default sample_id's ?

anyway this is the correct way to stop a sample ? make it an ID and pass it's address ?

Trent Gamblin

Yes it is.

Edgar Reynaldo

The problem was using a pointer that didn't point to valid memory - it was uninitialized. That's why using an ALLEGRO_SAMPLE_ID on the stack and passing it's address worked.

alex Ioan

Yea sorry but I'm stupid again...

I want to make a simple thing... no loops needed in my opinion:

Display text. If the user presses any keys, clear and display some other text...

I can't make it work

#SelectExpand
  1
  2if (player.introcheck()==0)
  3{
  4al_clear_to_color(al_map_rgb(0,0,0));   
  5//text
  6
  7al_wait_for_event(event_queue, &ev);
  8if (ev.type == ALLEGRO_EVENT_KEY_DOWN)
  9{al_flush_event_queue(event_queue);
 10al_clear_to_color(al_map_rgb(0,0,0));   
 11//more text
 12 }
 13
 14
 15al_wait_for_event(event_queue, &ev);
 16if (ev.type == ALLEGRO_EVENT_KEY_DOWN)
 17{al_flush_event_queue(event_queue);
 18player.introset();
 19}  
 20}

Edgar Reynaldo

If you have a timer registered to your event queue, then you won't ever get your ALLEGRO_EVENT_KEY_DOWN event, and it will just skip past those checks. You need to wait in a loop until the event is an ALLEGRO_EVENT_KEY_DOWN event.

void WaitForKeyPress(ALLEGRO_EVENT_QUEUE* queue) {
   while (1) {
      ALLEGRO_EVENT ev;
      al_wait_for_event(queue , &ev);
      if (ev.type == ALLEGRO_EVENT_KEY_DOWN) {break;}
   }
}

alex Ioan

done it ! thanks for the tip !

Thread #607989. Printed from Allegro.cc