Ptplayer question

[sandruzzo]

In order to play an sfx, I'm using _mt_playsfx. Is it possible to know when sfx finishes playing?

[roondar]

Not that I can see in the docs, no. But don't you know how long your SFX takes to play? You should be able to use that knowledge, or alternatively use the period/frequency and length to calculate it if that's desirable.

[phx]

It's hidden, but it is documented. When you look at the description of

_mt_playfx

in the ptplayer.readme, you can read:

  RETURN VALUES: A pointer to a channel-status structure (see ptplayer.h)
  when the sample is scheduled for playing, and NULL when the request was
  ignored.

Then have a look at this channel-status structure:

typedef struct SfxChanStatus
{
  UWORD n_note;
  UWORD n_cmd;
  UBYTE n_index;   /* channel index 0..3 */
  UBYTE n_sfxpri;  /* sfx_pri when playing, becomes 0 when done */
  /* Rest of structure is currently not exported. Don't rely on it! */
} SfxChanStatus;

Note the comment behind

n_sfxpri

. It means that you can poll this byte until it becomes zero, which means the channel has become idle. It works and I used it in some of my games.

[sandruzzo]

@phx

Is it the same with asm?

[phx]

Sure. The structure offset of

n_sfxpri

is obviously 5, so try this:

        bsr     _mt_playfx
        move.l  d0,a0
playing tst.b   5(a0)
        bne     playing

[sandruzzo]

@phx Thanks for your help and time! I'm using V3.8b version. Is there any new one?

[phx]

Originally Posted by sandruzzo

I'm using V3.8b version. Is there any new one?

Not sure what you mean. I never released such a version. The last release was V6.2: http://aminet.net/package/mus/play/ptplayer

[sandruzzo]

@phx

Sorry, my fault, it is the protracker version: v2.3b

[phx]

Originally I based my player on the source text and features of the official V2.3b source, but that has no longer much relevance.

[roondar]

Originally Posted by phx

It's hidden, but it is documented. When you look at the description of

_mt_playfx

in the ptplayer.readme, you can read:

  RETURN VALUES: A pointer to a channel-status structure (see ptplayer.h)
  when the sample is scheduled for playing, and NULL when the request was
  ignored.

Then have a look at this channel-status structure:

typedef struct SfxChanStatus
{
  UWORD n_note;
  UWORD n_cmd;
  UBYTE n_index;   /* channel index 0..3 */
  UBYTE n_sfxpri;  /* sfx_pri when playing, becomes 0 when done */
  /* Rest of structure is currently not exported. Don't rely on it! */
} SfxChanStatus;

Note the comment behind

n_sfxpri

. It means that you can poll this byte until it becomes zero, which means the channel has become idle. It works and I used it in some of my games.

Ah, I'll admit I only read the function prototypes
Nice to see it's in there though!

[sandruzzo]

@phx Works very good! I like it, very usefull! Thanks

[sandruzzo]

@phx

Speaking about sample rate, is there a way to get it from a sample, or do I have to set it by myself every time? When I play an sfx, I can hear some sort of "tac" when it start, do I have to take care of something to avoid it?

(sorry for my dummy guestions, but I'm not a very well into music and sfx stuffs)