mdw@git.distorted.org.uk Git - disorder/blob - lib/alsabg.h

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2008 Richard Kettlewell
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file alsabg.h
  19  * @brief Background-thread interface to ALSA
  20  *
  21  * This wraps ALSA with an interface which calls back to the client from a
  22  * thread.  It's not intended for completely general use, just what DisOrder
  23  * needs.
  24  */
  25
  26 #ifndef ALSABG_H
  27 #define ALSABG_H
  28
  29 /** @brief Supply audio callback
  30  * @param dst Where to write audio data
  31  * @param nsamples Number of samples to write
  32  * @return Number of samples written
  33  *
  34  * This function should write up to @p *nsamples samples of data at
  35  * @p dst, and return the number of samples written, or -1 if some error
  36  * occurred.  It will be called in a background thread.
  37  */
  38 typedef int alsa_bg_supply(void *dst,
  39                            unsigned nsamples_max);
  40
  41 void alsa_bg_init(const char *dev,
  42                   alsa_bg_supply *supply);
  43
  44 void alsa_bg_enable(void);
  45
  46 void alsa_bg_disable(void);
  47
  48 void alsa_bg_close(void);
  49
  50 #endif /* ALSABG_H */
  51
  52 /*
  53 Local Variables:
  54 c-basic-offset:2
  55 comment-column:40
  56 fill-column:79
  57 indent-tabs-mode:nil
  58 End:
  59 */