AHI question [SOLVED]

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elfpipe

Posted on: 2012/10/20 19:09 #1

Just can't stay away

I'm trying to add sound to my 3D Swingball game, and I have some problems. The amiga-specific sound code looks like this:


#include <stdio.h>



#include <proto/exec.h>

#include <proto/dos.h>

#include <devices/ahi.h>





#include "audio.h"

#include "audio_amiga.h"





struct MsgPort    *AHImp_sound     = NULL;

struct AHIRequest *AHIios_sound[nosamples];

struct AHIRequest *AHIio_sound     = NULL;

BYTE               AHIDevice_sound = -1;



void Amiga_FreeAhi()

{

    if(!AHIDevice_sound)

        IExec->CloseDevice((struct IORequest *)AHIio_sound);

    int i;

    for(i = 0; i < nosamples; i++)

        IExec->FreeSysObject(ASOT_IOREQUEST, AHIios_sound[i]);

    IExec->FreeSysObject(ASOT_IOREQUEST, (struct IORequest *)AHIio_sound);

    IExec->FreeSysObject(ASOT_PORT, AHImp_sound);

    

    audioison = 0;

}



void Amiga_InitAhi()

{

    if(audioison)

    {

        printf("Error: Audio already is on!\n");

        return;

    }

    if((AHImp_sound = IExec->AllocSysObjectTags(ASOT_PORT, TAG_DONE)) != NULL)

    {

           if((AHIio_sound = (struct AHIRequest *) IExec->AllocSysObjectTags(ASOT_IOREQUEST,

                                                                           ASOIOR_ReplyPort, AHImp_sound,

                                                                           ASOIOR_Size,sizeof(struct AHIRequest),

                                                                           TAG_DONE)) != NULL)

           {

              AHIio_sound->ahir_Version = 4;

              AHIDevice_sound = IExec->OpenDevice(AHINAME,0,(struct IORequest *)AHIio_sound,0);

        }

      }



      if(AHIDevice_sound)

      {

        printf("Unable to open %s/0 version 4\n",AHINAME);

        Amiga_FreeAhi();

        audioison = 0;

        return;

      }



    int i;

    for(i = 0; i < nosamples; i++)

    {

          AHIios_sound[i] = (struct AHIRequest *)IExec->AllocSysObjectTags(ASOT_IOREQUEST, ASOIOR_Duplicate, *AHIio_sound, TAG_DONE);

      

        AHIios_sound[i]->ahir_Std.io_Message.mn_Node.ln_Pri = 127;

        AHIios_sound[i]->ahir_Std.io_Command  = CMD_WRITE;

        AHIios_sound[i]->ahir_Std.io_Data     = samples[i]->data;

        AHIios_sound[i]->ahir_Std.io_Length   = samples[i]->data_size;

        AHIios_sound[i]->ahir_Std.io_Offset   = 0;

        AHIios_sound[i]->ahir_Frequency       = samples[i]->sample_rate;



        if(samples[i]->bits_per_sample == 8)

            AHIios_sound[i]->ahir_Type        = AHIST_M8S;

        else

            AHIios_sound[i]->ahir_Type       = AHIST_M16S;

        

        AHIios_sound[i]->ahir_Volume          = 0x10000;          // Full volume

        AHIios_sound[i]->ahir_Position        = 0x8000;           // Centered

        AHIios_sound[i]->ahir_Link            = NULL;

    }

    Amiga_PlaySample(0);

    Amiga_PlaySample(0);

    

    audioison = 1;

}



void Amiga_PlaySample(int s)

{ 

    if(IExec->CheckIO((struct IORequest *) AHIios_sound[s]) == NULL)

    {

        printf("Sample still playing, aborting IO...\n");

        IExec->AbortIO((struct IORequest *) AHIios_sound[s]);

        IExec->WaitIO((struct IORequest *) AHIios_sound[s]);

    }

    IExec->SendIO((struct IORequest *) AHIios_sound[s]);

}

The problem is this: In the middle of the game, I want to be able to abort playing a certain sample when another one pops up. Hence the CheckIO, AbortIO and WaitIO in the Amiga_PlaySample() function. But for some reason it doesn't work. CheckIO never returns NULL as expected, and SendIO messes up, so sound stops completely.

As you can see, I have inserted two test lines to the InitAhi() function, and here it "works" (it correctly prints "Sample still playing...(etc)".

What am I doing wrong??

Edited by alfkil on 2012/10/20 21:34:01

elfpipe

Re: AHI question

Posted on: 2012/10/20 21:03 #2

Just can't stay away

[SOLVED]

For some reason, I need to reset the ahir_Std.io_Length each time before calling SendIO. Problem hereby solved! :)

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