audiobell.c revision 1.2.2.2
1 1.2.2.2 christos /* $NetBSD: audiobell.c,v 1.2.2.2 2019/06/10 22:07:06 christos Exp $ */ 2 1.2.2.2 christos 3 1.2.2.2 christos /* 4 1.2.2.2 christos * Copyright (c) 1999 Richard Earnshaw 5 1.2.2.2 christos * Copyright (c) 2004 Ben Harris 6 1.2.2.2 christos * 7 1.2.2.2 christos * Redistribution and use in source and binary forms, with or without 8 1.2.2.2 christos * modification, are permitted provided that the following conditions 9 1.2.2.2 christos * are met: 10 1.2.2.2 christos * 1. Redistributions of source code must retain the above copyright 11 1.2.2.2 christos * notice, this list of conditions and the following disclaimer. 12 1.2.2.2 christos * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.2.2 christos * notice, this list of conditions and the following disclaimer in the 14 1.2.2.2 christos * documentation and/or other materials provided with the distribution. 15 1.2.2.2 christos * 3. All advertising materials mentioning features or use of this software 16 1.2.2.2 christos * must display the following acknowledgement: 17 1.2.2.2 christos * This product includes software developed by the RiscBSD team. 18 1.2.2.2 christos * 4. The name of the author may not be used to endorse or promote products 19 1.2.2.2 christos * derived from this software without specific prior written permission. 20 1.2.2.2 christos * 21 1.2.2.2 christos * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 1.2.2.2 christos * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 1.2.2.2 christos * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 1.2.2.2 christos * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 1.2.2.2 christos * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 1.2.2.2 christos * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 1.2.2.2 christos * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 1.2.2.2 christos * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 1.2.2.2 christos * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 1.2.2.2 christos * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 1.2.2.2 christos */ 32 1.2.2.2 christos 33 1.2.2.2 christos #include <sys/types.h> 34 1.2.2.2 christos __KERNEL_RCSID(0, "$NetBSD: audiobell.c,v 1.2.2.2 2019/06/10 22:07:06 christos Exp $"); 35 1.2.2.2 christos 36 1.2.2.2 christos #include <sys/audioio.h> 37 1.2.2.2 christos #include <sys/conf.h> 38 1.2.2.2 christos #include <sys/device.h> 39 1.2.2.2 christos #include <sys/malloc.h> 40 1.2.2.2 christos #include <sys/systm.h> 41 1.2.2.2 christos #include <sys/uio.h> 42 1.2.2.2 christos 43 1.2.2.2 christos #include <dev/audio/audio_if.h> 44 1.2.2.2 christos #include <dev/audio/audiovar.h> 45 1.2.2.2 christos #include <dev/audio/audiodef.h> 46 1.2.2.2 christos #include <dev/audio/audiobellvar.h> 47 1.2.2.2 christos 48 1.2.2.2 christos /* 44.1 kHz should reduce hum at higher pitches. */ 49 1.2.2.2 christos #define BELL_SAMPLE_RATE 44100 50 1.2.2.2 christos 51 1.2.2.2 christos /* 52 1.2.2.2 christos * dev is a device_t for the audio device to use. 53 1.2.2.2 christos * pitch is the pitch of the bell in Hz, 54 1.2.2.2 christos * period is the length in ms, 55 1.2.2.2 christos * volume is the amplitude in % of max, 56 1.2.2.2 christos * poll is no longer used. 57 1.2.2.2 christos */ 58 1.2.2.2 christos void 59 1.2.2.2 christos audiobell(void *dev, u_int pitch, u_int period, u_int volume, int poll) 60 1.2.2.2 christos { 61 1.2.2.2 christos dev_t audio; 62 1.2.2.2 christos int16_t *buf; 63 1.2.2.2 christos struct audiobell_arg bellarg; 64 1.2.2.2 christos audio_file_t *file; 65 1.2.2.2 christos audio_track_t *ptrack; 66 1.2.2.2 christos struct uio auio; 67 1.2.2.2 christos struct iovec aiov; 68 1.2.2.2 christos int i; 69 1.2.2.2 christos int remaincount; 70 1.2.2.2 christos int remainlen; 71 1.2.2.2 christos int wave1count; 72 1.2.2.2 christos int wave1len; 73 1.2.2.2 christos int len; 74 1.2.2.2 christos int16_t vol; 75 1.2.2.2 christos 76 1.2.2.2 christos KASSERT(volume <= 100); 77 1.2.2.2 christos 78 1.2.2.2 christos /* The audio system isn't built for polling. */ 79 1.2.2.2 christos if (poll) 80 1.2.2.2 christos return; 81 1.2.2.2 christos 82 1.2.2.2 christos /* Limit the pitch from 20Hz to Nyquist frequency. */ 83 1.2.2.2 christos if (pitch > BELL_SAMPLE_RATE / 2) 84 1.2.2.2 christos pitch = BELL_SAMPLE_RATE; 85 1.2.2.2 christos if (pitch < 20) 86 1.2.2.2 christos pitch = 20; 87 1.2.2.2 christos 88 1.2.2.2 christos buf = NULL; 89 1.2.2.2 christos audio = AUDIO_DEVICE | device_unit((device_t)dev); 90 1.2.2.2 christos 91 1.2.2.2 christos memset(&bellarg, 0, sizeof(bellarg)); 92 1.2.2.2 christos bellarg.encoding = AUDIO_ENCODING_SLINEAR_NE; 93 1.2.2.2 christos bellarg.precision = 16; 94 1.2.2.2 christos bellarg.channels = 1; 95 1.2.2.2 christos bellarg.sample_rate = BELL_SAMPLE_RATE; 96 1.2.2.2 christos 97 1.2.2.2 christos /* If not configured, we can't beep. */ 98 1.2.2.2 christos if (audiobellopen(audio, &bellarg) != 0) 99 1.2.2.2 christos return; 100 1.2.2.2 christos 101 1.2.2.2 christos file = bellarg.file; 102 1.2.2.2 christos ptrack = file->ptrack; 103 1.2.2.2 christos 104 1.2.2.2 christos /* msec to sample count. */ 105 1.2.2.2 christos remaincount = period * BELL_SAMPLE_RATE / 1000; 106 1.2.2.2 christos remainlen = remaincount * sizeof(int16_t); 107 1.2.2.2 christos 108 1.2.2.2 christos wave1count = BELL_SAMPLE_RATE / pitch; 109 1.2.2.2 christos wave1len = wave1count * sizeof(int16_t); 110 1.2.2.2 christos 111 1.2.2.2 christos buf = malloc(wave1len, M_TEMP, M_WAITOK); 112 1.2.2.2 christos if (buf == NULL) 113 1.2.2.2 christos goto out; 114 1.2.2.2 christos 115 1.2.2.2 christos /* Generate single square wave. It's enough to beep. */ 116 1.2.2.2 christos vol = 32767 * volume / 100; 117 1.2.2.2 christos for (i = 0; i < wave1count / 2; i++) { 118 1.2.2.2 christos buf[i] = vol; 119 1.2.2.2 christos } 120 1.2.2.2 christos vol = -vol; 121 1.2.2.2 christos for (; i < wave1count; i++) { 122 1.2.2.2 christos buf[i] = vol; 123 1.2.2.2 christos } 124 1.2.2.2 christos 125 1.2.2.2 christos /* Write while paused to avoid begin inserted silence. */ 126 1.2.2.2 christos ptrack->is_pause = true; 127 1.2.2.2 christos for (; remainlen > 0; remainlen -= wave1len) { 128 1.2.2.2 christos len = uimin(remainlen, wave1len); 129 1.2.2.2 christos aiov.iov_base = (void *)buf; 130 1.2.2.2 christos aiov.iov_len = len; 131 1.2.2.2 christos auio.uio_iov = &aiov; 132 1.2.2.2 christos auio.uio_iovcnt = 1; 133 1.2.2.2 christos auio.uio_offset = 0; 134 1.2.2.2 christos auio.uio_resid = len; 135 1.2.2.2 christos auio.uio_rw = UIO_WRITE; 136 1.2.2.2 christos UIO_SETUP_SYSSPACE(&auio); 137 1.2.2.2 christos if (audiobellwrite(file, &auio) != 0) 138 1.2.2.2 christos goto out; 139 1.2.2.2 christos 140 1.2.2.2 christos if (ptrack->usrbuf.used >= ptrack->usrbuf_blksize * NBLKHW) 141 1.2.2.2 christos ptrack->is_pause = false; 142 1.2.2.2 christos } 143 1.2.2.2 christos /* Here we go! */ 144 1.2.2.2 christos ptrack->is_pause = false; 145 1.2.2.2 christos out: 146 1.2.2.2 christos if (buf != NULL) 147 1.2.2.2 christos free(buf, M_TEMP); 148 1.2.2.2 christos audiobellclose(file); 149 1.2.2.2 christos } 150
Indexes created Wed Oct 29 12:09:47 GMT 2025