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/* Copyright 2004-2005 Sun Microsystems, Inc. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif
#include <sys/audio.h>
#include <sys/uio.h>
#include <limits.h>
#include <math.h>
#include <poll.h>
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86_OSlib.h"
#define BELL_RATE 48000 /* Samples per second */
#define BELL_HZ 50 /* Fraction of a second i.e. 1/x */
#define BELL_MS (1000/BELL_HZ) /* MS */
#define BELL_SAMPLES (BELL_RATE / BELL_HZ)
#define BELL_MIN 3 /* Min # of repeats */
#define AUDIO_DEVICE "/dev/audio"
void
xf86OSRingBell(int loudness, int pitch, int duration)
{
static short samples[BELL_SAMPLES];
static short silence[BELL_SAMPLES]; /* "The Sound of Silence" */
static int lastFreq;
int cnt;
int i;
int written;
int repeats;
int freq;
audio_info_t audioInfo;
struct iovec iov[IOV_MAX];
int iovcnt;
double ampl, cyclen, phase;
int audioFD;
if ((loudness <= 0) || (pitch <= 0) || (duration <= 0)) {
return;
}
lastFreq = 0;
memset(silence, 0, sizeof(silence));
audioFD = open(AUDIO_DEVICE, O_WRONLY | O_NONBLOCK);
if (audioFD == -1) {
xf86Msg(X_ERROR, "Bell: cannot open audio device \"%s\": %s\n",
AUDIO_DEVICE, strerror(errno));
return;
}
freq = pitch;
freq = min(freq, (BELL_RATE / 2) - 1);
freq = max(freq, 2 * BELL_HZ);
/*
* Ensure full waves per buffer
*/
freq -= freq % BELL_HZ;
if (freq != lastFreq) {
lastFreq = freq;
ampl = 16384.0;
cyclen = (double) freq / (double) BELL_RATE;
phase = 0.0;
for (i = 0; i < BELL_SAMPLES; i++) {
samples[i] = (short) (ampl * sin(2.0 * M_PI * phase));
phase += cyclen;
if (phase >= 1.0)
phase -= 1.0;
}
}
repeats = (duration + (BELL_MS / 2)) / BELL_MS;
repeats = max(repeats, BELL_MIN);
loudness = max(0, loudness);
loudness = min(loudness, 100);
#ifdef DEBUG
ErrorF("BELL : freq %d volume %d duration %d repeats %d\n",
freq, loudness, duration, repeats);
#endif
AUDIO_INITINFO(&audioInfo);
audioInfo.play.encoding = AUDIO_ENCODING_LINEAR;
audioInfo.play.sample_rate = BELL_RATE;
audioInfo.play.channels = 2;
audioInfo.play.precision = 16;
audioInfo.play.gain = min(AUDIO_MAX_GAIN, AUDIO_MAX_GAIN * loudness / 100);
if (ioctl(audioFD, AUDIO_SETINFO, &audioInfo) < 0){
xf86Msg(X_ERROR,
"Bell: AUDIO_SETINFO failed on audio device \"%s\": %s\n",
AUDIO_DEVICE, strerror(errno));
close(audioFD);
return;
}
iovcnt = 0;
for (cnt = 0; cnt <= repeats; cnt++) {
if (cnt == repeats) {
/* Insert a bit of silence so that multiple beeps are distinct and
* not compressed into a single tone.
*/
iov[iovcnt].iov_base = (char *) silence;
iov[iovcnt++].iov_len = sizeof(silence);
} else {
iov[iovcnt].iov_base = (char *) samples;
iov[iovcnt++].iov_len = sizeof(samples);
}
if ((iovcnt >= IOV_MAX) || (cnt == repeats)) {
written = writev(audioFD, iov, iovcnt);
if ((written < ((int)(sizeof(samples) * iovcnt)))) {
/* audio buffer was full! */
int naptime;
if (written == -1) {
if (errno != EAGAIN) {
xf86Msg(X_ERROR,
"Bell: writev failed on audio device \"%s\": %s\n",
AUDIO_DEVICE, strerror(errno));
close(audioFD);
return;
}
i = iovcnt;
} else {
i = ((sizeof(samples) * iovcnt) - written)
/ sizeof(samples);
}
cnt -= i;
/* sleep a little to allow audio buffer to drain */
naptime = BELL_MS * i;
poll(NULL, 0, naptime);
i = ((sizeof(samples) * iovcnt) - written) % sizeof(samples);
iovcnt = 0;
if ((written != -1) && (i > 0)) {
iov[iovcnt].iov_base = ((char *) samples) + i;
iov[iovcnt++].iov_len = sizeof(samples) - i;
}
} else {
iovcnt = 0;
}
}
}
close(audioFD);
return;
}
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