int32_t MV_VoiceAvailable(int32_t priority)
{
// Check if we have any free voices
if (!LL_Empty(&VoicePool, next, prev))
return TRUE;
DisableInterrupts();
VoiceNode *voice, *node;
// check if we have a higher priority than a voice that is playing.
for (voice = node = VoiceList.next; node != &VoiceList; node = node->next)
{
if (node->priority < voice->priority)
voice = node;
}
if ((voice == &VoiceList) || (priority < voice->priority))
{
RestoreInterrupts();
return FALSE;
}
RestoreInterrupts();
return TRUE;
}
VoiceNode *MV_AllocVoice(int32_t priority)
{
VoiceNode *voice, *node;
DisableInterrupts();
// Check if we have any free voices
if (LL_Empty(&VoicePool, next, prev))
{
// check if we have a higher priority than a voice that is playing.
for (voice = node = VoiceList.next; node != &VoiceList; node = node->next)
{
if (node->priority < voice->priority)
voice = node;
}
if (priority >= voice->priority && voice != &VoiceList && voice->handle >= MV_MINVOICEHANDLE)
MV_Kill(voice->handle);
if (LL_Empty(&VoicePool, next, prev))
{
// No free voices
RestoreInterrupts();
return NULL;
}
}
voice = VoicePool.next;
LL_Remove(voice, next, prev);
RestoreInterrupts();
int32_t vhan = MV_MINVOICEHANDLE;
// Find a free voice handle
do
{
if (++vhan < MV_MINVOICEHANDLE || vhan > MV_MaxVoices)
vhan = MV_MINVOICEHANDLE;
} while (MV_VoicePlaying(vhan));
voice->handle = vhan;
return voice;
}
void LL_Destroy(node *header_ptr) {
LL_Empty(header_ptr);
free(header_ptr) ;
return ;
}
