diff --git a/audio/coreaudio.c b/audio/coreaudio.c
index a5229f2..b9c6d90 100644
--- a/audio/coreaudio.c
+++ b/audio/coreaudio.c
@@ -40,9 +40,6 @@ typedef struct coreaudioVoiceOut {
     AudioDeviceID outputDeviceID;
     UInt32 audioDevicePropertyBufferFrameSize;
     AudioStreamBasicDescription outputStreamBasicDescription;
-    int live;
-    int decr;
-    int rpos;
 } coreaudioVoiceOut;
 
 static void coreaudio_logstatus (OSStatus status)
@@ -181,31 +178,29 @@ static int coreaudio_unlock (coreaudioVoiceOut *core, const char *fn_name)
     return 0;
 }
 
-static int coreaudio_run_out (HWVoiceOut *hw, int live)
-{
-    int decr;
-    coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;
-
-    if (coreaudio_lock (core, "coreaudio_run_out")) {
-        return 0;
+#define COREAUDIO_WRAPPER_FUNC(name, ret_type, args_decl, args) \
+    static ret_type glue(coreaudio_, name)args_decl             \
+    {                                                           \
+        coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;     \
+        ret_type ret;                                           \
+                                                                \
+        if (coreaudio_lock(core, "coreaudio_" #name)) {         \
+            return 0;                                           \
+        }                                                       \
+                                                                \
+        ret = glue(audio_generic_, name)args;                   \
+                                                                \
+        coreaudio_unlock(core, "coreaudio_" #name);             \
+        return ret;                                             \
     }
-
-    if (core->decr > live) {
-        ldebug ("core->decr %d live %d core->live %d\n",
-                core->decr,
-                live,
-                core->live);
-    }
-
-    decr = MIN (core->decr, live);
-    core->decr -= decr;
-
-    core->live = live - decr;
-    hw->rpos = core->rpos;
-
-    coreaudio_unlock (core, "coreaudio_run_out");
-    return decr;
-}
+COREAUDIO_WRAPPER_FUNC(get_buffer_out, void *, (HWVocieOut *hw, size_t *size),
+                       (hw, size))
+COREAUDIO_WRAPPER_FUNC(put_buffer_out_nowrite, size_t,
+                       (HWVoiceOut *hw, void *buf, size_t size),
+                       (hw, buf, size))
+COREAUDIO_WRAPPER_FUNC(write, size_t, (HWVoiceOut *hw, void *buf, size_t size),
+                       (hw, buf, size))
+#undef COREAUDIO_WRAPPER_FUNC
 
 /* callback to feed audiooutput buffer */
 static OSStatus audioDeviceIOProc(
@@ -217,19 +212,11 @@ static OSStatus audioDeviceIOProc(
     const AudioTimeStamp* inOutputTime,
     void* hwptr)
 {
-    UInt32 frame, frameCount;
-    float *out = outOutputData->mBuffers[0].mData;
+    UInt32 frameCount, pending_frames;
+    void *out = outOutputData->mBuffers[0].mData;
     HWVoiceOut *hw = hwptr;
     coreaudioVoiceOut *core = (coreaudioVoiceOut *) hwptr;
-    int rpos, live;
-    struct st_sample *src;
-#ifndef FLOAT_MIXENG
-#ifdef RECIPROCAL
-    const float scale = 1.f / UINT_MAX;
-#else
-    const float scale = UINT_MAX;
-#endif
-#endif
+    size_t len;
 
     if (coreaudio_lock (core, "audioDeviceIOProc")) {
         inInputTime = 0;
@@ -237,42 +224,51 @@ static OSStatus audioDeviceIOProc(
     }
 
     frameCount = core->audioDevicePropertyBufferFrameSize;
-    live = core->live;
+    pending_frames = hw->pending_emul >> hw->info.shift;
 
     /* if there are not enough samples, set signal and return */
-    if (live < frameCount) {
+    if (pending_frames < frameCount) {
         inInputTime = 0;
         coreaudio_unlock (core, "audioDeviceIOProc(empty)");
         return 0;
     }
 
-    rpos = core->rpos;
-    src = hw->mix_buf + rpos;
+    len = frameCount << hw->info.shift;
+    while (len) {
+        size_t write_len;
+        ssize_t start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
+        if (start < 0) {
+            start += hw->size_emul;
+        }
+        assert(start >= 0 && start < hw->size_emul);
 
-    /* fill buffer */
-    for (frame = 0; frame < frameCount; frame++) {
-#ifdef FLOAT_MIXENG
-        *out++ = src[frame].l; /* left channel */
-        *out++ = src[frame].r; /* right channel */
-#else
-#ifdef RECIPROCAL
-        *out++ = src[frame].l * scale; /* left channel */
-        *out++ = src[frame].r * scale; /* right channel */
-#else
-        *out++ = src[frame].l / scale; /* left channel */
-        *out++ = src[frame].r / scale; /* right channel */
-#endif
-#endif
+        write_len = MIN(MIN(hw->pending_emul, len),
+                        hw->size_emul - start);
+
+        memcpy(out, hw->buf_emul + start, write_len);
+        hw->pending_emul -= write_len;
+        len -= write_len;
+        out += write_len;
     }
 
-    rpos = (rpos + frameCount) % hw->samples;
-    core->decr += frameCount;
-    core->rpos = rpos;
-
     coreaudio_unlock (core, "audioDeviceIOProc");
     return 0;
 }
 
+static UInt32 coreaudio_get_flags(struct audio_pcm_info *info,
+                                  struct audsettings *as)
+{
+    UInt32 flags = info->sign ? kAudioFormatFlagIsSignedInteger : 0;
+    if (as->endianness) { /* 0 = little, 1 = big */
+        flags |= kAudioFormatFlagIsBigEndian;
+    }
+
+    if (flags == 0) { /* must not be 0 */
+        flags = kAudioFormatFlagsAreAllClear;
+    }
+    return flags;
+}
+
 static int coreaudio_init_out(HWVoiceOut *hw, struct audsettings *as,
                               void *drv_opaque)
 {
@@ -391,6 +387,16 @@ static int coreaudio_init_out(HWVoiceOut *hw, struct audsettings *as,
 
     /* set Samplerate */
     core->outputStreamBasicDescription.mSampleRate = (Float64) as->freq;
+    core->outputStreamBasicDescription.mFormatID = kAudioFormatLinearPCM;
+    core->outputStreamBasicDescription.mFormatFlags =
+        coreaudio_get_flags(hw->info, as);
+    core->outputStreamBasicDescription.mBytesPerPacket =
+        core->outputStreamBasicDescription.mBytesPerFrame =
+        hw->info.nchannels * hw->info.bits / 8;
+    core->outputStreamBasicDescription.mFramesPerPacket = 1;
+    core->outputStreamBasicDescription.mChannelsPerFrame = hw->info.nchannels;
+    core->outputStreamBasicDescription.mBitsPerChannel = hw->info.bits;
+
     propertySize = sizeof(core->outputStreamBasicDescription);
     status = AudioDeviceSetProperty(
         core->outputDeviceID,
@@ -504,7 +510,9 @@ static void coreaudio_audio_fini (void *opaque)
 static struct audio_pcm_ops coreaudio_pcm_ops = {
     .init_out = coreaudio_init_out,
     .fini_out = coreaudio_fini_out,
-    .run_out  = coreaudio_run_out,
+    .write    = coreaudio_write,
+    .get_buffer_out = coreaudio_get_buffer_out,
+    .put_buffer_out = coreaudio_put_buffer_out_nowrite,
     .ctl_out  = coreaudio_ctl_out
 };
 
