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audiobell.c revision 1.2 
      1  1.2  isaki /*	$NetBSD: audiobell.c,v 1.2 2019/05/08 13:40:17 isaki Exp $	*/
      2  1.2  isaki 
      3  1.2  isaki /*
      4  1.2  isaki  * Copyright (c) 1999 Richard Earnshaw
      5  1.2  isaki  * Copyright (c) 2004 Ben Harris
      6  1.2  isaki  *
      7  1.2  isaki  * Redistribution and use in source and binary forms, with or without
      8  1.2  isaki  * modification, are permitted provided that the following conditions
      9  1.2  isaki  * are met:
     10  1.2  isaki  * 1. Redistributions of source code must retain the above copyright
     11  1.2  isaki  *    notice, this list of conditions and the following disclaimer.
     12  1.2  isaki  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.2  isaki  *    notice, this list of conditions and the following disclaimer in the
     14  1.2  isaki  *    documentation and/or other materials provided with the distribution.
     15  1.2  isaki  * 3. All advertising materials mentioning features or use of this software
     16  1.2  isaki  *    must display the following acknowledgement:
     17  1.2  isaki  *	This product includes software developed by the RiscBSD team.
     18  1.2  isaki  * 4. The name of the author may not be used to endorse or promote products
     19  1.2  isaki  *    derived from this software without specific prior written permission.
     20  1.2  isaki  *
     21  1.2  isaki  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  1.2  isaki  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  1.2  isaki  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  1.2  isaki  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  1.2  isaki  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  1.2  isaki  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  1.2  isaki  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  1.2  isaki  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  1.2  isaki  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  1.2  isaki  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  1.2  isaki  */
     32  1.2  isaki 
     33  1.2  isaki #include <sys/types.h>
     34  1.2  isaki __KERNEL_RCSID(0, "$NetBSD: audiobell.c,v 1.2 2019/05/08 13:40:17 isaki Exp $");
     35  1.2  isaki 
     36  1.2  isaki #include <sys/audioio.h>
     37  1.2  isaki #include <sys/conf.h>
     38  1.2  isaki #include <sys/device.h>
     39  1.2  isaki #include <sys/malloc.h>
     40  1.2  isaki #include <sys/systm.h>
     41  1.2  isaki #include <sys/uio.h>
     42  1.2  isaki 
     43  1.2  isaki #include <dev/audio/audio_if.h>
     44  1.2  isaki #include <dev/audio/audiovar.h>
     45  1.2  isaki #include <dev/audio/audiodef.h>
     46  1.2  isaki #include <dev/audio/audiobellvar.h>
     47  1.2  isaki 
     48  1.2  isaki /* 44.1 kHz should reduce hum at higher pitches. */
     49  1.2  isaki #define BELL_SAMPLE_RATE	44100
     50  1.2  isaki 
     51  1.2  isaki /*
     52  1.2  isaki  * dev is a device_t for the audio device to use.
     53  1.2  isaki  * pitch is the pitch of the bell in Hz,
     54  1.2  isaki  * period is the length in ms,
     55  1.2  isaki  * volume is the amplitude in % of max,
     56  1.2  isaki  * poll is no longer used.
     57  1.2  isaki  */
     58  1.2  isaki void
     59  1.2  isaki audiobell(void *dev, u_int pitch, u_int period, u_int volume, int poll)
     60  1.2  isaki {
     61  1.2  isaki 	dev_t audio;
     62  1.2  isaki 	int16_t *buf;
     63  1.2  isaki 	struct audiobell_arg bellarg;
     64  1.2  isaki 	audio_file_t *file;
     65  1.2  isaki 	audio_track_t *ptrack;
     66  1.2  isaki 	struct uio auio;
     67  1.2  isaki 	struct iovec aiov;
     68  1.2  isaki 	int i;
     69  1.2  isaki 	int remaincount;
     70  1.2  isaki 	int remainlen;
     71  1.2  isaki 	int wave1count;
     72  1.2  isaki 	int wave1len;
     73  1.2  isaki 	int len;
     74  1.2  isaki 	int16_t vol;
     75  1.2  isaki 
     76  1.2  isaki 	KASSERT(volume <= 100);
     77  1.2  isaki 
     78  1.2  isaki 	/* The audio system isn't built for polling. */
     79  1.2  isaki 	if (poll)
     80  1.2  isaki 		return;
     81  1.2  isaki 
     82  1.2  isaki 	/* Limit the pitch from 20Hz to Nyquist frequency. */
     83  1.2  isaki 	if (pitch > BELL_SAMPLE_RATE / 2)
     84  1.2  isaki 		pitch = BELL_SAMPLE_RATE;
     85  1.2  isaki 	if (pitch < 20)
     86  1.2  isaki 		pitch = 20;
     87  1.2  isaki 
     88  1.2  isaki 	buf = NULL;
     89  1.2  isaki 	audio = AUDIO_DEVICE | device_unit((device_t)dev);
     90  1.2  isaki 
     91  1.2  isaki 	memset(&bellarg, 0, sizeof(bellarg));
     92  1.2  isaki 	bellarg.encoding = AUDIO_ENCODING_SLINEAR_NE;
     93  1.2  isaki 	bellarg.precision = 16;
     94  1.2  isaki 	bellarg.channels = 1;
     95  1.2  isaki 	bellarg.sample_rate = BELL_SAMPLE_RATE;
     96  1.2  isaki 
     97  1.2  isaki 	/* If not configured, we can't beep. */
     98  1.2  isaki 	if (audiobellopen(audio, &bellarg) != 0)
     99  1.2  isaki 		return;
    100  1.2  isaki 
    101  1.2  isaki 	file = bellarg.file;
    102  1.2  isaki 	ptrack = file->ptrack;
    103  1.2  isaki 
    104  1.2  isaki 	/* msec to sample count. */
    105  1.2  isaki 	remaincount = period * BELL_SAMPLE_RATE / 1000;
    106  1.2  isaki 	remainlen = remaincount * sizeof(int16_t);
    107  1.2  isaki 
    108  1.2  isaki 	wave1count = BELL_SAMPLE_RATE / pitch;
    109  1.2  isaki 	wave1len = wave1count * sizeof(int16_t);
    110  1.2  isaki 
    111  1.2  isaki 	buf = malloc(wave1len, M_TEMP, M_WAITOK);
    112  1.2  isaki 	if (buf == NULL)
    113  1.2  isaki 		goto out;
    114  1.2  isaki 
    115  1.2  isaki 	/* Generate single square wave.  It's enough to beep. */
    116  1.2  isaki 	vol = 32767 * volume / 100;
    117  1.2  isaki 	for (i = 0; i < wave1count / 2; i++) {
    118  1.2  isaki 		buf[i] = vol;
    119  1.2  isaki 	}
    120  1.2  isaki 	vol = -vol;
    121  1.2  isaki 	for (; i < wave1count; i++) {
    122  1.2  isaki 		buf[i] = vol;
    123  1.2  isaki 	}
    124  1.2  isaki 
    125  1.2  isaki 	/* Write while paused to avoid begin inserted silence. */
    126  1.2  isaki 	ptrack->is_pause = true;
    127  1.2  isaki 	for (; remainlen > 0; remainlen -= wave1len) {
    128  1.2  isaki 		len = uimin(remainlen, wave1len);
    129  1.2  isaki 		aiov.iov_base = (void *)buf;
    130  1.2  isaki 		aiov.iov_len = len;
    131  1.2  isaki 		auio.uio_iov = &aiov;
    132  1.2  isaki 		auio.uio_iovcnt = 1;
    133  1.2  isaki 		auio.uio_offset = 0;
    134  1.2  isaki 		auio.uio_resid = len;
    135  1.2  isaki 		auio.uio_rw = UIO_WRITE;
    136  1.2  isaki 		UIO_SETUP_SYSSPACE(&auio);
    137  1.2  isaki 		if (audiobellwrite(file, &auio) != 0)
    138  1.2  isaki 			goto out;
    139  1.2  isaki 
    140  1.2  isaki 		if (ptrack->usrbuf.used >= ptrack->usrbuf_blksize * NBLKHW)
    141  1.2  isaki 			ptrack->is_pause = false;
    142  1.2  isaki 	}
    143  1.2  isaki 	/* Here we go! */
    144  1.2  isaki 	ptrack->is_pause = false;
    145  1.2  isaki out:
    146  1.2  isaki 	if (buf != NULL)
    147  1.2  isaki 		free(buf, M_TEMP);
    148  1.2  isaki 	audiobellclose(file);
    149  1.2  isaki }
    150