156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
/*
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* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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* Creative Labs, Inc.
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* Lee Revell <rlrevell@joe-job.com>
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* Routines for control of EMU10K1 chips - voice manager
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*
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* Rewrote voice allocator for multichannel support - rlrevell 12/2004
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*
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* BUGS:
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* --
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*
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* TODO:
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* --
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/driver.h>
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#include <linux/time.h>
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#include <sound/core.h>
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#include <sound/emu10k1.h>
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/* Previously the voice allocator started at 0 every time. The new voice
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* allocator uses a round robin scheme. The next free voice is tracked in
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* the card record and each allocation begins where the last left off. The
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* hardware requires stereo interleaved voices be aligned to an even/odd
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* boundary. For multichannel voice allocation we ensure than the block of
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* voices does not cross the 32 voice boundary. This simplifies the
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* multichannel support and ensures we can use a single write to the
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* (set|clear)_loop_stop registers. Otherwise (for example) the voices would
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* get out of sync when pausing/resuming a stream.
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* --rlrevell
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*/
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static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
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struct snd_emu10k1_voice **rvoice)
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{
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struct snd_emu10k1_voice *voice;
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int i, j, k, first_voice, last_voice, skip;
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*rvoice = NULL;
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first_voice = last_voice = 0;
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for (i = emu->next_free_voice, j = 0; j < NUM_G ; i += number, j += number) {
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// printk("i %d j %d next free %d!\n", i, j, emu->next_free_voice);
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i %= NUM_G;
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/* stereo voices must be even/odd */
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if ((number == 2) && (i % 2)) {
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i++;
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continue;
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}
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skip = 0;
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for (k = 0; k < number; k++) {
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voice = &emu->voices[(i+k) % NUM_G];
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if (voice->use) {
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skip = 1;
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break;
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}
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}
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if (!skip) {
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// printk("allocated voice %d\n", i);
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first_voice = i;
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last_voice = (i + number) % NUM_G;
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emu->next_free_voice = last_voice;
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break;
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}
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}
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if (first_voice == last_voice)
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return -ENOMEM;
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for (i=0; i < number; i++) {
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voice = &emu->voices[(first_voice + i) % NUM_G];
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// printk("voice alloc - %i, %i of %i\n", voice->number, idx-first_voice+1, number);
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voice->use = 1;
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switch (type) {
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case EMU10K1_PCM:
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voice->pcm = 1;
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break;
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case EMU10K1_SYNTH:
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voice->synth = 1;
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break;
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case EMU10K1_MIDI:
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voice->midi = 1;
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break;
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case EMU10K1_EFX:
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voice->efx = 1;
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break;
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}
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}
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*rvoice = &emu->voices[first_voice];
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return 0;
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}
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int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
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struct snd_emu10k1_voice **rvoice)
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{
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unsigned long flags;
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int result;
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snd_assert(rvoice != NULL, return -EINVAL);
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snd_assert(number, return -EINVAL);
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spin_lock_irqsave(&emu->voice_lock, flags);
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for (;;) {
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result = voice_alloc(emu, type, number, rvoice);
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if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI)
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break;
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/* free a voice from synth */
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if (emu->get_synth_voice) {
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result = emu->get_synth_voice(emu);
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if (result >= 0) {
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struct snd_emu10k1_voice *pvoice = &emu->voices[result];
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pvoice->interrupt = NULL;
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pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
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pvoice->epcm = NULL;
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}
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}
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if (result < 0)
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break;
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}
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spin_unlock_irqrestore(&emu->voice_lock, flags);
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return result;
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}
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int snd_emu10k1_voice_free(struct snd_emu10k1 *emu,
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struct snd_emu10k1_voice *pvoice)
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{
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unsigned long flags;
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snd_assert(pvoice != NULL, return -EINVAL);
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spin_lock_irqsave(&emu->voice_lock, flags);
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pvoice->interrupt = NULL;
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pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
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pvoice->epcm = NULL;
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snd_emu10k1_voice_init(emu, pvoice->number);
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spin_unlock_irqrestore(&emu->voice_lock, flags);
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return 0;
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}
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