/*
* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
* Creative Labs, Inc.
+ * Lee Revell <rlrevell@joe-job.com>
* Routines for control of EMU10K1 chips - voice manager
*
+ * Rewrote voice allocator for multichannel support - rlrevell 12/2004
+ *
* BUGS:
* --
*
#include <sound/core.h>
#include <sound/emu10k1.h>
-static int voice_alloc(emu10k1_t *emu, emu10k1_voice_type_t type, int pair, emu10k1_voice_t **rvoice)
+/* Previously the voice allocator started at 0 every time. The new voice
+ * allocator uses a round robin scheme. The next free voice is tracked in
+ * the card record and each allocation begins where the last left off. The
+ * hardware requires stereo interleaved voices be aligned to an even/odd
+ * boundary. For multichannel voice allocation we ensure than the block of
+ * voices does not cross the 32 voice boundary. This simplifies the
+ * multichannel support and ensures we can use a single write to the
+ * (set|clear)_loop_stop registers. Otherwise (for example) the voices would
+ * get out of sync when pausing/resuming a stream.
+ * --rlrevell
+ */
+
+static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
+ struct snd_emu10k1_voice **rvoice)
{
- emu10k1_voice_t *voice, *voice2;
- int idx;
+ struct snd_emu10k1_voice *voice;
+ int i, j, k, first_voice, last_voice, skip;
*rvoice = NULL;
- for (idx = 0; idx < 64; idx += pair ? 2 : 1) {
- voice = &emu->voices[idx];
- voice2 = pair ? &emu->voices[idx+1] : NULL;
- if (voice->use || (voice2 && voice2->use))
+ first_voice = last_voice = 0;
+ for (i = emu->next_free_voice, j = 0; j < NUM_G ; i += number, j += number) {
+ // printk("i %d j %d next free %d!\n", i, j, emu->next_free_voice);
+ i %= NUM_G;
+
+ /* stereo voices must be even/odd */
+ if ((number == 2) && (i % 2)) {
+ i++;
continue;
+ }
+
+ skip = 0;
+ for (k = 0; k < number; k++) {
+ voice = &emu->voices[(i+k) % NUM_G];
+ if (voice->use) {
+ skip = 1;
+ break;
+ }
+ }
+ if (!skip) {
+ // printk("allocated voice %d\n", i);
+ first_voice = i;
+ last_voice = (i + number) % NUM_G;
+ emu->next_free_voice = last_voice;
+ break;
+ }
+ }
+
+ if (first_voice == last_voice)
+ return -ENOMEM;
+
+ for (i=0; i < number; i++) {
+ voice = &emu->voices[(first_voice + i) % NUM_G];
+ // printk("voice alloc - %i, %i of %i\n", voice->number, idx-first_voice+1, number);
voice->use = 1;
- if (voice2)
- voice2->use = 1;
switch (type) {
case EMU10K1_PCM:
voice->pcm = 1;
- if (voice2)
- voice2->pcm = 1;
break;
case EMU10K1_SYNTH:
voice->synth = 1;
case EMU10K1_MIDI:
voice->midi = 1;
break;
+ case EMU10K1_EFX:
+ voice->efx = 1;
+ break;
}
- // printk("voice alloc - %i, pair = %i\n", voice->number, pair);
- *rvoice = voice;
- return 0;
}
- return -ENOMEM;
+ *rvoice = &emu->voices[first_voice];
+ return 0;
}
-int snd_emu10k1_voice_alloc(emu10k1_t *emu, emu10k1_voice_type_t type, int pair, emu10k1_voice_t **rvoice)
+int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
+ struct snd_emu10k1_voice **rvoice)
{
unsigned long flags;
int result;
snd_assert(rvoice != NULL, return -EINVAL);
- snd_assert(!pair || type == EMU10K1_PCM, return -EINVAL);
+ snd_assert(number, return -EINVAL);
spin_lock_irqsave(&emu->voice_lock, flags);
for (;;) {
- result = voice_alloc(emu, type, pair, rvoice);
- if (result == 0 || type != EMU10K1_PCM)
+ result = voice_alloc(emu, type, number, rvoice);
+ if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI)
break;
/* free a voice from synth */
if (emu->get_synth_voice) {
result = emu->get_synth_voice(emu);
if (result >= 0) {
- emu10k1_voice_t *pvoice = &emu->voices[result];
+ struct snd_emu10k1_voice *pvoice = &emu->voices[result];
pvoice->interrupt = NULL;
- pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = 0;
+ pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
pvoice->epcm = NULL;
}
}
return result;
}
-int snd_emu10k1_voice_free(emu10k1_t *emu, emu10k1_voice_t *pvoice)
+int snd_emu10k1_voice_free(struct snd_emu10k1 *emu,
+ struct snd_emu10k1_voice *pvoice)
{
unsigned long flags;
snd_assert(pvoice != NULL, return -EINVAL);
spin_lock_irqsave(&emu->voice_lock, flags);
pvoice->interrupt = NULL;
- pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = 0;
+ pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
pvoice->epcm = NULL;
snd_emu10k1_voice_init(emu, pvoice->number);
spin_unlock_irqrestore(&emu->voice_lock, flags);