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playroutine_nna.c
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playroutine_nna.c
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#include "sackit_internal.h"
void sackit_nna_note_cut(sackit_playback_t *sackit, sackit_achannel_t *achn)
{
if(achn == NULL)
return;
achn->flags &= ~(
SACKIT_ACHN_MIXING
|SACKIT_ACHN_PLAYING
|SACKIT_ACHN_SUSTAIN);
sackit->anticlick[0] += achn->anticlick[0];
sackit->anticlick[1] += achn->anticlick[1];
sackit->anticlick_f[0] += achn->anticlick_f[0];
sackit->anticlick_f[1] += achn->anticlick_f[1];
achn->anticlick[0] = 0;
achn->anticlick[1] = 0;
achn->anticlick_f[0] = 0.0f;
achn->anticlick_f[1] = 0.0f;
achn->filt_prev[0][0] = 0.0f;
achn->filt_prev[0][1] = 0.0f;
achn->filt_prev[1][0] = 0.0f;
achn->filt_prev[1][1] = 0.0f;
}
void sackit_nna_note_off(sackit_playback_t *sackit, sackit_achannel_t *achn)
{
if(achn == NULL)
return;
achn->flags &= ~SACKIT_ACHN_SUSTAIN;
if(achn->instrument != NULL)
{
it_instrument_t *cins = achn->instrument;
if(cins->evol.flg & IT_ENV_ON)
{
if(cins->evol.flg & IT_ENV_LOOP)
achn->flags |= SACKIT_ACHN_FADEOUT;
} else {
achn->flags |= SACKIT_ACHN_FADEOUT;
}
}
}
void sackit_nna_note_fade(sackit_playback_t *sackit, sackit_achannel_t *achn)
{
if(achn == NULL)
return;
achn->flags |= SACKIT_ACHN_FADEOUT;
}
void sackit_nna_past_note(sackit_playback_t *sackit, sackit_achannel_t *achn, int nna)
{
while(achn != NULL)
{
sackit_achannel_t *achn_next = achn->next;
switch(nna)
{
case 0:
sackit_nna_note_cut(sackit, achn);
break;
case 2:
sackit_nna_note_off(sackit, achn);
break;
case 3:
sackit_nna_note_fade(sackit, achn);
break;
}
achn = achn_next;
}
}
/*
from ITTECH.TXT:
The player in Impulse Tracker 'allocates' channels to notes whenever they
are *PLAYED*. In sample mode, the allocation is simple:
Virtual Channel (number) = 'Host' channel (number)
In instrument mode, the following procedure is used:
Check if channel is already playing ---Yes--> set 'background' flag on.
| 'Trigger' NNA. If NNA=cut,
No then use this virtual
| channel.
| |
|<------------------ else -----------------/
|
v
Search and find the first non-active virtual channel.
|
Non-active channel found? ----Yes----> Use this for playback.
|
No
|
v
Search through and find the channel of lowest volume that is in the #
'background' (ie. no longer controlled directly) #
| #
Background channel found? ----Yes----> Use this for playback. #
| #
No #
| #
v #
Return error - the note is *NOT* allocated a channel, and hence is not #
played. #
This is actually quite a simple process... just that it's another of
those 'hassles' to have to write...
### Note: This is by far the simplest implementation of congestion
resolution. IT 2.03 and above have a greatly enhanced
method which more selectively removes the most insignificant
channel. Obviously, there is no best way to do this - I
encourage you to experiment and find new algorithms for
yourself.
*/
void sackit_nna_allocate(sackit_playback_t *sackit, sackit_pchannel_t *pchn)
{
int i;
// TODO: copy NNA info to the achn (or pchn?)
sackit_achannel_t *old_achn = NULL;
// Do a duplicate check
// TODO: analyse this more deeply
if(pchn->bg_achn != NULL)
{
sackit_achannel_t *achn = pchn->bg_achn;
while(achn != NULL)
{
sackit_achannel_t *achn_next = achn->next;
int dca_do = 0;
if(achn->instrument != NULL && achn != pchn->achn)
{
switch(achn->instrument->dct)
{
case 0: // Off
break;
case 1: // Note
dca_do = (achn->note == pchn->note);
break;
case 2: // Instrument
dca_do = (achn->instrument == pchn->instrument);
break;
case 3: // Sample
dca_do = (achn->sample == pchn->sample);
break;
}
}
if(dca_do)
{
//printf("DCA!\n");
switch(achn->instrument->dca)
{
case 0:
sackit_nna_note_cut(sackit, achn);
break;
case 1:
sackit_nna_note_off(sackit, achn);
break;
case 2:
sackit_nna_note_fade(sackit, achn);
break;
}
}
achn = achn_next;
}
}
//printf("NNATRIG %016llX %016llX\n", pchn, pchn->achn);
// Check if playing
if(pchn->achn != NULL)
{
old_achn = pchn->achn;
//printf("NNA %i %016llX\n", pchn->nna, old_achn);
if(pchn->nna == 0)
{
sackit_nna_note_cut(sackit, old_achn);
return;
}
if(!(old_achn->flags & SACKIT_ACHN_PLAYING))
return;
if(pchn->nna == 2)
sackit_nna_note_off(sackit, old_achn);
if(pchn->nna == 3)
sackit_nna_note_fade(sackit, old_achn);
old_achn->flags |= SACKIT_ACHN_BACKGND;
pchn->achn = NULL;
}
// Search and find the first non-active virtual channel.
for(i = 0; i < sackit->achn_count; i++)
{
sackit_achannel_t *achn = &(sackit->achn[i]);
if(!(achn->flags & SACKIT_ACHN_PLAYING))
{
if(achn->parent != NULL)
{
if(achn->parent->achn == achn)
achn->parent->achn = NULL;
if(achn->parent->bg_achn == achn)
achn->parent->bg_achn = achn->next;
}
if(achn->prev != NULL)
achn->prev->next = achn->next;
if(achn->next != NULL)
achn->next->prev = achn->prev;
sackit_playback_reset_achn(achn);
pchn->bg_achn = old_achn;
pchn->achn = achn;
achn->parent = pchn;
achn->prev = NULL;
achn->next = old_achn;
if(old_achn != NULL)
old_achn->prev = achn;
//printf("%i\n", i);
return;
}
}
// Search through and find the channel of lowest volume that is in the
// 'background' (ie. no longer controlled directly)
int tvol = 0xFFFFFF;
int ti = 0;
for(i = 0; i < sackit->achn_count; i++)
{
sackit_achannel_t *achn = &(sackit->achn[i]);
if(achn->parent != NULL && achn->parent->achn == achn)
continue; // foreground channel - SKIP THIS
int cvol = (int32_t)achn->sv;
cvol *= (int32_t)achn->iv;
cvol *= (int32_t)achn->vol;
cvol *= (int32_t)achn->cv;
cvol >>= 16;
cvol *= (int32_t)achn->evol.y;
cvol *= (int32_t)achn->fadeout;
if(cvol < tvol)
{
tvol = cvol;
ti = i;
}
}
// There's our channel.
sackit_achannel_t *achn = &(sackit->achn[ti]);
if(achn->parent != NULL)
{
if(achn->parent->achn == achn)
achn->parent->achn = NULL;
if(achn->parent->bg_achn == achn)
achn->parent->bg_achn = achn->next;
}
if(achn->prev != NULL)
achn->prev->next = achn->next;
if(achn->next != NULL)
achn->next->prev = achn->prev;
if(old_achn == achn)
old_achn = achn->next;
pchn->bg_achn = old_achn;
sackit_playback_reset_achn(achn);
pchn->achn = achn;
achn->parent = pchn;
achn->prev = NULL;
achn->next = old_achn;
if(old_achn != NULL)
old_achn->prev = achn;
}