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diff --git a/hw/darwin/quartz/quartzAudio.c b/hw/darwin/quartz/quartzAudio.c
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+++ b/hw/darwin/quartz/quartzAudio.c
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+//
+// QuartzAudio.m
+//
+// X Window bell support using CoreAudio or AppKit.
+// Greg Parker  gparker@cs.stanford.edu  19 Feb 2001
+//
+// Info about sine wave sound playback:
+// CoreAudio code derived from macosx-dev posting by Tim Wood
+//  http://www.omnigroup.com/mailman/archive/macosx-dev/2000-May/002004.html
+// Smoothing transitions between sounds
+//  http://www.wam.umd.edu/~mphoenix/dss/dss.html
+//
+/*
+ * Copyright (c) 2001 Greg Parker. 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 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 ABOVE LISTED COPYRIGHT HOLDER(S) 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.
+ *
+ * Except as contained in this notice, the name(s) of the above copyright
+ * holders shall not be used in advertising or otherwise to promote the sale,
+ * use or other dealings in this Software without prior written authorization.
+ */
+/* $XFree86: xc/programs/Xserver/hw/darwin/quartz/quartzAudio.c,v 1.1 2002/03/28 02:21:18 torrey Exp $ */
+
+#include "quartzCommon.h"
+#include "quartzAudio.h"
+
+#include <CoreAudio/CoreAudio.h>
+#include <pthread.h>
+
+#include "inputstr.h"
+#include "extensions/XI.h"
+
+void NSBeep();
+
+typedef struct QuartzAudioRec {
+    double frequency;
+    double amplitude;
+
+    UInt32 curFrame;
+    UInt32 remainingFrames;
+    UInt32 totalFrames;
+    UInt32 bytesPerFrame;
+    double sampleRate;
+    UInt32 fadeLength;
+
+    UInt32 bufferByteCount;
+    Boolean playing;
+    pthread_mutex_t lock;
+
+    // used to fade out interrupted sound and avoid 'pop'
+    double prevFrequency;
+    double prevAmplitude;
+    UInt32 prevFrame; 
+} QuartzAudioRec;
+
+static AudioDeviceID quartzAudioDevice = kAudioDeviceUnknown;
+static QuartzAudioRec data;
+
+
+/*
+ * QuartzAudioEnvelope
+ *  Fade sound in and out to avoid pop.
+ *  Sounds with shorter duration will never reach full amplitude. Deal.
+ */
+static double QuartzAudioEnvelope(
+    UInt32 curFrame,
+    UInt32 totalFrames,
+    UInt32 fadeLength )
+{
+    double fadeFrames = min(fadeLength, totalFrames / 2);
+    if (fadeFrames < 1) return 0;
+
+    if (curFrame < fadeFrames) {
+        return curFrame / fadeFrames;
+    } else if (curFrame > totalFrames - fadeFrames) {
+        return (totalFrames-curFrame) / fadeFrames;
+    } else {
+        return 1.0;
+    }
+}
+
+
+/*
+ * QuartzFillBuffer
+ *  Fill this buffer with data and update the data position.
+ *  FIXME: this is ugly
+ */
+static void QuartzFillBuffer(
+    AudioBuffer *audiobuffer,
+    QuartzAudioRec *data )
+{
+    float *buffer, *b;
+    unsigned int frame, frameCount;
+    unsigned int bufferFrameCount;
+    float multiplier, v;
+    int i;
+
+    buffer = (float *)audiobuffer->mData;
+    bufferFrameCount = audiobuffer->mDataByteSize / data->bytesPerFrame;
+
+    frameCount = min(bufferFrameCount, data->remainingFrames);
+
+    // Fade out previous sine wave, if any.
+    b = buffer;
+    if (data->prevFrame) {
+        multiplier = 2*M_PI*(data->prevFrequency/data->sampleRate);
+        for (frame = 0; frame < data->fadeLength; frame++) {
+            v = data->prevAmplitude *
+                QuartzAudioEnvelope(frame+data->fadeLength,
+                                    2*data->fadeLength,
+                                    data->fadeLength) *
+                sin(multiplier * (data->prevFrame+frame));
+            for (i = 0; i < audiobuffer->mNumberChannels; i++) {
+                *b++ = v;
+            }
+        }
+        // no more prev fade
+        data->prevFrame = 0;
+
+        // adjust for space eaten by prev fade
+        buffer += audiobuffer->mNumberChannels*frame;
+        bufferFrameCount -= frame;
+        frameCount = min(bufferFrameCount, data->remainingFrames);
+    }
+
+    // Write a sine wave with the specified frequency and amplitude
+    multiplier = 2*M_PI*(data->frequency/data->sampleRate);
+    for (frame = 0; frame < frameCount; frame++) {
+        v = data->amplitude * 
+            QuartzAudioEnvelope(data->curFrame+frame, data->totalFrames,
+                                data->fadeLength) *
+            sin(multiplier * (data->curFrame+frame));
+        for (i = 0; i < audiobuffer->mNumberChannels; i++) {
+            *b++ = v;
+        }
+    }
+
+    // Zero out the rest of the buffer, if any
+    memset(b, 0, sizeof(float) * audiobuffer->mNumberChannels *
+           (bufferFrameCount-frame));
+
+    data->curFrame += frameCount;
+    data->remainingFrames -= frameCount;
+    if (data->remainingFrames == 0) {
+        data->playing = FALSE;
+        data->curFrame = 0;
+    }
+}
+
+
+/*
+ * QuartzAudioIOProc
+ *  Callback function for audio playback.
+ *  FIXME: use inOutputTime to correct for skipping
+ */
+static OSStatus 
+QuartzAudioIOProc(
+    AudioDeviceID inDevice, 
+    const AudioTimeStamp *inNow, 
+    const AudioBufferList *inInputData, 
+    const AudioTimeStamp *inInputTime, 
+    AudioBufferList *outOutputData, 
+    const AudioTimeStamp *inOutputTime, 
+    void *inClientData )
+{
+    QuartzAudioRec *data = (QuartzAudioRec *)inClientData;
+    int i;
+    Boolean wasPlaying;
+
+    pthread_mutex_lock(&data->lock);
+    wasPlaying = data->playing;
+    for (i = 0; i < outOutputData->mNumberBuffers; i++) {
+        if (data->playing) {
+            QuartzFillBuffer(outOutputData->mBuffers+i, data); 
+        }
+        else {
+            memset(outOutputData->mBuffers[i].mData, 0, 
+                   outOutputData->mBuffers[i].mDataByteSize);
+        }
+    }
+    if (wasPlaying  &&  !data->playing) {
+        OSStatus err;
+        err = AudioDeviceStop(inDevice, QuartzAudioIOProc);
+    }
+    pthread_mutex_unlock(&data->lock);
+    return 0;
+}
+
+
+/*
+ * QuartzCoreAudioBell
+ *  Play a tone using the CoreAudio API
+ */
+static void QuartzCoreAudioBell(
+    int volume,         // volume is % of max
+    int pitch,          // pitch is Hz
+    int duration )      // duration is milliseconds
+{
+    if (quartzAudioDevice == kAudioDeviceUnknown) return;
+
+    pthread_mutex_lock(&data.lock);
+
+    // fade previous sound, if any
+    data.prevFrequency = data.frequency;
+    data.prevAmplitude = data.amplitude;
+    data.prevFrame = data.curFrame;
+
+    // set new sound
+    data.frequency = pitch;
+    data.amplitude = volume / 100.0;
+    data.curFrame = 0;
+    data.totalFrames = (int)(data.sampleRate * duration / 1000.0);
+    data.remainingFrames = data.totalFrames;
+
+    if (! data.playing) {
+        OSStatus status;
+        status = AudioDeviceStart(quartzAudioDevice, QuartzAudioIOProc);
+        if (status) {
+            ErrorF("QuartzAudioBell: AudioDeviceStart returned %d\n", status);
+        } else {
+            data.playing = TRUE;
+        }
+    }
+    pthread_mutex_unlock(&data.lock);
+}
+
+
+/*
+ * QuartzBell
+ *  Ring the bell
+ */
+void QuartzBell(
+    int volume,             // volume in percent of max
+    DeviceIntPtr pDevice,
+    pointer ctrl,
+    int class )
+{
+    int pitch;              // pitch in Hz
+    int duration;           // duration in milliseconds
+
+    if (class == BellFeedbackClass) {
+        pitch = ((BellCtrl*)ctrl)->pitch;
+        duration = ((BellCtrl*)ctrl)->duration;
+    } else if (class == KbdFeedbackClass) {
+        pitch = ((KeybdCtrl*)ctrl)->bell_pitch;
+        duration = ((KeybdCtrl*)ctrl)->bell_duration;    
+    } else {
+        ErrorF("QuartzBell: bad bell class %d\n", class);
+        return;
+    }
+
+    if (quartzUseSysBeep) {
+        if (volume)
+            NSBeep();
+    } else {
+        QuartzCoreAudioBell(volume, pitch, duration);
+    }
+}
+
+
+/*
+ * QuartzAudioInit
+ *  Prepare to play the bell with the CoreAudio API
+ */
+void QuartzAudioInit(void) 
+{
+    UInt32 propertySize;
+    OSStatus status;
+    AudioDeviceID outputDevice;
+    AudioStreamBasicDescription outputStreamDescription;
+    double sampleRate;
+
+    // Get the default output device
+    propertySize = sizeof(outputDevice);
+    status = AudioHardwareGetProperty(
+                    kAudioHardwarePropertyDefaultOutputDevice, 
+                    &propertySize, &outputDevice);
+    if (status) {
+        ErrorF("QuartzAudioInit: AudioHardwareGetProperty returned %d\n",
+               status);
+        return;
+    }
+    if (outputDevice == kAudioDeviceUnknown) {
+        ErrorF("QuartzAudioInit: No audio output devices available.\n");
+        return;
+    }
+
+    // Get the basic device description
+    propertySize = sizeof(outputStreamDescription);
+    status = AudioDeviceGetProperty(outputDevice, 0, FALSE, 
+                                    kAudioDevicePropertyStreamFormat, 
+                                    &propertySize, &outputStreamDescription);
+    if (status) {
+        ErrorF("QuartzAudioInit: GetProperty(stream format) returned %d\n",
+               status);
+        return;
+    }
+    sampleRate = outputStreamDescription.mSampleRate;
+
+    // Fill in the playback data
+    data.frequency = 0;
+    data.amplitude = 0;
+    data.curFrame = 0;
+    data.remainingFrames = 0; 
+    data.bytesPerFrame = outputStreamDescription.mBytesPerFrame;
+    data.sampleRate = sampleRate;
+    // data.bufferByteCount = bufferByteCount;
+    data.playing = FALSE;
+    data.prevAmplitude = 0;
+    data.prevFrame = 0;
+    data.prevFrequency = 0;
+    data.fadeLength = data.sampleRate / 200;
+    pthread_mutex_init(&data.lock, NULL); // fixme error check
+
+    // fixme assert fadeLength<framesPerBuffer
+
+    // Prepare for playback
+    status = AudioDeviceAddIOProc(outputDevice, QuartzAudioIOProc, &data);
+    if (status) {
+        ErrorF("QuartzAudioInit: AddIOProc returned %d\n", status);
+        return;
+    }
+
+    // success!
+    quartzAudioDevice = outputDevice;
+}