n_synallocvoice.c
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/*====================================================================
*
* Copyright 1993, Silicon Graphics, Inc.
* All Rights Reserved.
*
* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,
* Inc.; the contents of this file may not be disclosed to third
* parties, copied or duplicated in any form, in whole or in part,
* without the prior written permission of Silicon Graphics, Inc.
*
* RESTRICTED RIGHTS LEGEND:
* Use, duplication or disclosure by the Government is subject to
* restrictions as set forth in subdivision (c)(1)(ii) of the Rights
* in Technical Data and Computer Software clause at DFARS
* 252.227-7013, and/or in similar or successor clauses in the FAR,
* DOD or NASA FAR Supplement. Unpublished - rights reserved under the
* Copyright Laws of the United States.
*====================================================================*/
#include <os_internal.h>
#include <ultraerror.h>
#include "n_synthInternals.h"
static s32 _allocatePVoice(N_PVoice **pvoice, s16 priority);
s32 n_alSynAllocVoice(N_ALVoice *voice, ALVoiceConfig *vc)
{
N_PVoice *pvoice = 0;
ALFilter *f;
ALParam *update;
s32 stolen;
#ifdef _DEBUG
/* need two updates if voice is stolen */
if (n_syn->paramList == 0) {
__osError(ERR_ALSYN_NO_UPDATE, 0);
return 0;
} else if (n_syn->paramList->next == 0) {
__osError(ERR_ALSYN_NO_UPDATE, 0);
return 0;
}
#endif
voice->priority = vc->priority;
voice->unityPitch = vc->unityPitch;
voice->table = 0;
voice->fxBus = vc->fxBus;
voice->state = AL_STOPPED;
voice->pvoice = 0;
stolen = _allocatePVoice(&pvoice, vc->priority);
if (pvoice) { /* if we were able to allocate a voice */
if (stolen) {
pvoice->offset = 552;
pvoice->vvoice->pvoice = 0; /* zero stolen voice */
#if 1
pvoice->vvoice = voice;
voice->pvoice = pvoice;
#endif
/*
* ramp down stolen voice
*/
update = __n_allocParam();
#ifdef SAMPLE_ROUND
update->delta = SAMPLE184( n_syn->paramSamples );
#else
update->delta = n_syn->paramSamples;
#endif
update->type = AL_FILTER_SET_VOLUME;
update->data.i = 0;
update->moredata.i = 368; /* pvoice->offset - 184 */
n_alEnvmixerParam(voice->pvoice, AL_FILTER_ADD_UPDATE, update);
/*
* stop stolen voice
*/
update = __n_allocParam();
if (update) {
#ifdef SAMPLE_ROUND
update->delta = SAMPLE184( n_syn->paramSamples + pvoice->offset);
#else
update->delta = n_syn->paramSamples + pvoice->offset;
#endif
update->type = AL_FILTER_STOP_VOICE;
update->next = 0;
n_alEnvmixerParam(voice->pvoice, AL_FILTER_ADD_UPDATE, update);
} else {
#ifdef _DEBUG
__osError(ERR_ALSYN_NO_UPDATE, 0);
#endif
}
} else {
pvoice->offset = 0;
#if 1
pvoice->vvoice = voice;
voice->pvoice = pvoice;
#endif
}
#if 0
pvoice->vvoice = voice; /* assign new voice */
voice->pvoice = pvoice;
#endif
}
return (pvoice != 0);
}
s32 _allocatePVoice(N_PVoice **pvoice, s16 priority)
{
ALLink *dl;
N_PVoice *pv;
s32 stolen = 0;
if ((dl = n_syn->pLameList.next) != 0) { /* check the lame list first */
*pvoice = (N_PVoice *)dl;
alUnlink(dl);
alLink(dl, &n_syn->pAllocList);
} else if ((dl = n_syn->pFreeList.next) != 0) { /* from the free list */
*pvoice = (N_PVoice *) dl;
alUnlink(dl);
alLink(dl, &n_syn->pAllocList);
} else { /* steal one */
for (dl = n_syn->pAllocList.next; dl != 0; dl = dl->next) {
pv = (N_PVoice *)dl;
/*
* if it is lower priority and not already stolen, keep it
* as a candidate for stealing
*/
if ((pv->vvoice->priority <= priority) && (pv->offset == 0)) {
*pvoice = pv;
priority = pv->vvoice->priority;
stolen = 1;
}
}
}
return stolen;
}