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Sourcecode: alsa-driver version File versions

voice.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *                   Creative Labs, Inc.
 *  Routines for control of EMU10K1 chips - voice manager
 *
 *  BUGS:
 *    --
 *
 *  TODO:
 *    --
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/driver.h>
#include <linux/time.h>
#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)
{
      emu10k1_voice_t *voice, *voice2;
      int idx;

      *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))
                  continue;
            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;
                  break;
            case EMU10K1_MIDI:
                  voice->midi = 1;
                  break;
            }
            // printk("voice alloc - %i, pair = %i\n", voice->number, pair);
            *rvoice = voice;
            return 0;
      }
      return -ENOMEM;
}

int snd_emu10k1_voice_alloc(emu10k1_t *emu, emu10k1_voice_type_t type, int pair, emu10k1_voice_t **rvoice)
{
      unsigned long flags;
      int result;

      snd_assert(rvoice != NULL, return -EINVAL);
      snd_assert(!pair || type == EMU10K1_PCM, return -EINVAL);

      spin_lock_irqsave(&emu->voice_lock, flags);
      for (;;) {
            result = voice_alloc(emu, type, pair, rvoice);
            if (result == 0 || type != EMU10K1_PCM)
                  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];
                        pvoice->interrupt = NULL;
                        pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = 0;
                        pvoice->epcm = NULL;
                  }
            }
            if (result < 0)
                  break;
      }
      spin_unlock_irqrestore(&emu->voice_lock, flags);

      return result;
}

int snd_emu10k1_voice_free(emu10k1_t *emu, emu10k1_voice_t *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->epcm = NULL;
      snd_emu10k1_voice_init(emu, pvoice->number);
      spin_unlock_irqrestore(&emu->voice_lock, flags);
      return 0;
}

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