129 lines
4.7 KiB
C
129 lines
4.7 KiB
C
/* $NetBSD: audiovar.h,v 1.9 1997/03/20 03:19:55 mycroft Exp $ */
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/*
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* Copyright (c) 1991-1993 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: Header: audiovar.h,v 1.3 93/07/18 14:07:25 mccanne Exp (LBL)
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*/
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/*
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* Initial/default block duration is both configurable and patchable.
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*/
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#ifndef AUDIO_BLK_MS
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#define AUDIO_BLK_MS 20 /* 20 ms */
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#endif
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#ifndef AUDIO_BACKLOG
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#define AUDIO_BACKLOG 3 /* 60 ms */
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#endif
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/*
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* Use a single page as the size of the audio ring buffers, so that
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* the data won't cross a page boundary. This way the dma carried out
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* in the hardware module will be efficient (i.e., at_dma() won't have
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* to make a copy).
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*/
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#ifndef AU_RING_SIZE
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#define AU_RING_SIZE NBPG
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#endif
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#define AU_RING_MOD(k) ((k) & (AU_RING_SIZE - 1))
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#define AU_RING_EMPTY(rp) ((rp)->hp == (rp)->tp)
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#define AU_RING_FULL(rp) (AU_RING_MOD((rp)->tp + 1) == (rp)->hp)
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#define AU_RING_LEN(rp) (AU_RING_MOD((rp)->tp - (rp)->hp))
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#define AU_RING_INIT(rp) { \
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(rp)->nblk = (rp)->au_stamp = 0; \
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(rp)->hp = (rp)->tp = (rp)->bp; \
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}
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struct audio_buffer {
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u_char *hp; /* head */
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u_char *tp; /* tail */
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u_char *bp; /* start of buffer */
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u_char *ep; /* end of buffer */
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int nblk; /* number of active blocks in buffer */
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int maxblk; /* max # of active blocks in buffer */
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u_long au_stamp; /* number of audio samples read/written */
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u_short cb_pause; /* io paused */
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u_long cb_drops; /* missed samples from over/underrun */
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u_long cb_pdrops; /* paused samples */
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int fill; /* number of silence pad bytes */
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u_char *otp; /* point where silence padding started */
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};
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/*
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* Software state, per audio device.
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*/
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struct audio_softc {
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void *hw_hdl; /* Hardware driver handle */
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struct audio_hw_if *hw_if; /* Hardware interface */
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u_char sc_open; /* single use device */
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#define AUOPEN_READ 0x01
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#define AUOPEN_WRITE 0x02
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u_char sc_mode; /* bitmask for RECORD/PLAY */
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struct selinfo sc_wsel; /* write selector */
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struct selinfo sc_rsel; /* read selector */
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struct proc *sc_async; /* process who wants SIGIO */
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/* Sleep channels for reading and writing. */
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int sc_rchan;
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int sc_wchan;
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/* Ring buffers, separate for record and play. */
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struct audio_buffer rr; /* Record ring */
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struct audio_buffer pr; /* Play ring */
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u_char *auzero_block; /* a block of silence */
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u_char sc_rbus; /* input dma in progress */
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u_char sc_pbus; /* output dma in progress */
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u_long sc_wseek; /* timestamp of last frame written */
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u_long sc_rseek; /* timestamp of last frame read */
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int sc_blksize; /* recv block (chunk) size in bytes */
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int sc_smpl_in_blk; /* # samples in a block */
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int sc_50ms; /* # of samples for 50ms? */
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int sc_backlog; /* # blks of xmit backlog to generate */
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int sc_lowat; /* xmit low water mark (for wakeup) */
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int sc_hiwat; /* xmit high water mark (for wakeup) */
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int sc_rblks; /* number of phantom record blocks */
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int sc_wblks; /* number of output silence blocks */
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int sc_pencoding; /* current encoding; play */
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int sc_rencoding; /* current encoding; record */
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};
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