4f3fc10939
fix semantics of AUDIO_WERROR (now returns a count). Also repair audio driver back to "real-time mode" where user must provide data quickly enough for real time audio or silence is played until user catches up. Add optional "play all" mode (additional bit in mode field) to play all samples provided, with silence when needed to avoid buffer underrun.
123 lines
4.5 KiB
C
123 lines
4.5 KiB
C
/* $NetBSD: audiovar.h,v 1.6 1996/02/17 02:29:05 jtk 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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};
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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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/* 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 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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