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Old 01 October 2022, 10:58   #1
sandruzzo
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Ptplayer question

In order to play an sfx, I'm using _mt_playsfx. Is it possible to know when sfx finishes playing?
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Old 01 October 2022, 13:24   #2
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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.
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Old 01 October 2022, 16:04   #3
phx
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It's hidden, but it is documented. When you look at the description of
_mt_playfx
in the ptplayer.readme, you can read:
Code:
  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:
Code:
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.
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Old 03 October 2022, 10:48   #4
sandruzzo
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@phx

Is it the same with asm?
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Old 03 October 2022, 12:09   #5
phx
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Sure. The structure offset of
n_sfxpri
is obviously 5, so try this:
Code:
        bsr     _mt_playfx
        move.l  d0,a0
playing tst.b   5(a0)
        bne     playing
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Old 03 October 2022, 12:26   #6
sandruzzo
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@phx Thanks for your help and time! I'm using V3.8b version. Is there any new one?
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Old 03 October 2022, 14:41   #7
phx
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Quote:
Originally Posted by sandruzzo View Post
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
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Old 03 October 2022, 14:53   #8
sandruzzo
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@phx

Sorry, my fault, it is the protracker version: v2.3b
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Old 03 October 2022, 15:34   #9
phx
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Originally I based my player on the source text and features of the official V2.3b source, but that has no longer much relevance.
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Old 03 October 2022, 15:41   #10
roondar
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Quote:
Originally Posted by phx View Post
It's hidden, but it is documented. When you look at the description of
_mt_playfx
in the ptplayer.readme, you can read:
Code:
  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:
Code:
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!
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Old 04 October 2022, 15:07   #11
sandruzzo
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@phx Works very good! I like it, very usefull! Thanks
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Old 06 October 2022, 06:47   #12
sandruzzo
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@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)

Last edited by sandruzzo; 06 October 2022 at 07:39.
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