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/*
TiMidity++ -- MIDI to WAVE converter and player
Copyright (C) 1999-2002 Masanao Izumo <mo@goice.co.jp>
Copyright (C) 1995 Tuukka Toivonen <tt@cgs.fi>
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
aq.h - Audio queue.
Written by Masanao Izumo <mo@goice.co.jp>
*/
#ifndef ___AQ_H_
#define ___AQ_H_
/* interfaces */
extern int aq_calc_fragsize(void);
/* aq_calc_fragsize() calculates the best fragment size for audio device.
*/
extern void aq_setup(void);
/* aq_setup() allocates the buffer for software queue, and estimate
* maxmum queue size of audio device.
*/
extern void aq_set_soft_queue(double soft_buff_time, double fill_start_time);
/* aq_set_soft_queue() makes software audio queue.
* If fill_start_time is positive, TiMidity doesn't start playing immidiately
* until the autio buffer is filled.
*/
extern int aq_add(int32 *samples, int32 count);
/* aq_add() adds new samples to software queue. If samples is NULL,
* aq_add() only updates internal software queue buffer.
*/
extern int32 aq_samples(void);
/* aq_samples() returns number of samples which is really played out.
*/
extern int32 aq_filled(void);
extern int32 aq_soft_filled(void);
/* aq_filled() returns filled queue length of audio device.
* aq_soft_filled() returns filled queue length of software buffer.
*/
extern int32 aq_fillable(void);
/* aq_fillable() returns fillable queue length of qudio device. */
extern int aq_flush(int discard);
/* If discard is true, aq_flush() discards all audio queue and returns
* immediately, otherwise aq_flush() waits until play all out.
* aq_flush() returns RC_* message.
*/
extern int aq_soft_flush(void);
/* aq_soft_flush() transfers all buffer to device */
extern int aq_fill_nonblocking(void);
/* aq_fill_nonblocking() transfers software audio buffer to device.
* This function doesn't block if (play_mode->flag&PF_CAN_TRACE) is true.
*/
extern double aq_filled_ratio(void);
/* aq_filled_ratio() returns filled ratio for audio device queue. */
extern int aq_get_dev_queuesize(void);
/* aq_get_dev_queuesize() returns device audio queue length
*/
extern int aq_fill_buffer_flag;
/* non-zero if aq_add() is in filling mode */
#endif /* ___AQ_H_ */
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