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	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	*/