Sweden-Number/dlls/winecoreaudio.drv/mmdevdrv.c

/*
 * Copyright 2011 Andrew Eikum for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#define NONAMELESSUNION
#define COBJMACROS
#include "config.h"

#include <stdarg.h>

#include "windef.h"
#include "winbase.h"
#include "winnls.h"
#include "winreg.h"
#include "wine/debug.h"
#include "wine/unicode.h"
#include "wine/list.h"

#include "ole2.h"
#include "mmdeviceapi.h"
#include "devpkey.h"
#include "dshow.h"
#include "dsound.h"

#include "initguid.h"
#include "endpointvolume.h"
#include "audioclient.h"
#include "audiopolicy.h"

#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>

#include <libkern/OSAtomic.h>
#include <CoreAudio/CoreAudio.h>
#include <AudioToolbox/AudioQueue.h>

WINE_DEFAULT_DEBUG_CHANNEL(coreaudio);

#define NULL_PTR_ERR MAKE_HRESULT(SEVERITY_ERROR, FACILITY_WIN32, RPC_X_NULL_REF_POINTER)

#define CAPTURE_BUFFERS 5

static const REFERENCE_TIME DefaultPeriod = 200000;
static const REFERENCE_TIME MinimumPeriod = 100000;

typedef struct _QueuedBufInfo {
    Float64 start_sampletime;
    UINT64 start_pos;
    UINT32 len_frames;
    struct list entry;
} QueuedBufInfo;

typedef struct _AQBuffer {
    AudioQueueBufferRef buf;
    struct list entry;
    BOOL used;
} AQBuffer;

struct ACImpl;
typedef struct ACImpl ACImpl;

typedef struct _AudioSession {
    GUID guid;
    struct list clients;

    IMMDevice *device;

    float master_vol;
    UINT32 channel_count;
    float *channel_vols;
    BOOL mute;

    CRITICAL_SECTION lock;

    struct list entry;
} AudioSession;

typedef struct _AudioSessionWrapper {
    IAudioSessionControl2 IAudioSessionControl2_iface;
    IChannelAudioVolume IChannelAudioVolume_iface;
    ISimpleAudioVolume ISimpleAudioVolume_iface;

    LONG ref;

    ACImpl *client;
    AudioSession *session;
} AudioSessionWrapper;

struct ACImpl {
    IAudioClient IAudioClient_iface;
    IAudioRenderClient IAudioRenderClient_iface;
    IAudioCaptureClient IAudioCaptureClient_iface;
    IAudioClock IAudioClock_iface;
    IAudioClock2 IAudioClock2_iface;
    IAudioStreamVolume IAudioStreamVolume_iface;

    LONG ref;

    IMMDevice *parent;

    WAVEFORMATEX *fmt;

    EDataFlow dataflow;
    DWORD flags;
    AUDCLNT_SHAREMODE share;
    HANDLE event;
    float *vols;

    AudioDeviceID adevid;
    AudioQueueRef aqueue;
    AudioObjectPropertyScope scope;
    HANDLE timer;
    UINT32 period_ms, bufsize_frames, inbuf_frames;
    UINT64 last_time, written_frames;
    AudioQueueBufferRef public_buffer;
    UINT32 getbuf_last;
    int playing;

    Float64 highest_sampletime, next_sampletime;

    AudioSession *session;
    AudioSessionWrapper *session_wrapper;

    struct list entry;

    struct list avail_buffers;
    struct list queued_buffers; /* either in avail, queued or public_buffer */
    struct list queued_bufinfos;

    OSSpinLock lock;
};

enum PlayingStates {
    StateStopped = 0,
    StatePlaying,
    StateInTransition
};

static const IAudioClientVtbl AudioClient_Vtbl;
static const IAudioRenderClientVtbl AudioRenderClient_Vtbl;
static const IAudioCaptureClientVtbl AudioCaptureClient_Vtbl;
static const IAudioSessionControl2Vtbl AudioSessionControl2_Vtbl;
static const ISimpleAudioVolumeVtbl SimpleAudioVolume_Vtbl;
static const IAudioClockVtbl AudioClock_Vtbl;
static const IAudioClock2Vtbl AudioClock2_Vtbl;
static const IAudioStreamVolumeVtbl AudioStreamVolume_Vtbl;
static const IChannelAudioVolumeVtbl ChannelAudioVolume_Vtbl;
static const IAudioSessionManager2Vtbl AudioSessionManager2_Vtbl;

typedef struct _SessionMgr {
    IAudioSessionManager2 IAudioSessionManager2_iface;

    LONG ref;

    IMMDevice *device;
} SessionMgr;

static const WCHAR drv_keyW[] = {'S','o','f','t','w','a','r','e','\\',
    'W','i','n','e','\\','D','r','i','v','e','r','s','\\',
    'w','i','n','e','c','o','r','e','a','u','d','i','o','.','d','r','v',0};
static const WCHAR drv_key_devicesW[] = {'S','o','f','t','w','a','r','e','\\',
    'W','i','n','e','\\','D','r','i','v','e','r','s','\\',
    'w','i','n','e','c','o','r','e','a','u','d','i','o','.','d','r','v','\\','d','e','v','i','c','e','s',0};
static const WCHAR guidW[] = {'g','u','i','d',0};

static HANDLE g_timer_q;

static CRITICAL_SECTION g_sessions_lock;
static CRITICAL_SECTION_DEBUG g_sessions_lock_debug =
{
    0, 0, &g_sessions_lock,
    { &g_sessions_lock_debug.ProcessLocksList, &g_sessions_lock_debug.ProcessLocksList },
      0, 0, { (DWORD_PTR)(__FILE__ ": g_sessions_lock") }
};
static CRITICAL_SECTION g_sessions_lock = { &g_sessions_lock_debug, -1, 0, 0, 0, 0 };
static struct list g_sessions = LIST_INIT(g_sessions);

static HRESULT AudioCaptureClient_GetNextPacket(ACImpl *This, UINT32 *frames);
static AudioSessionWrapper *AudioSessionWrapper_Create(ACImpl *client);
static HRESULT ca_setvol(ACImpl *This, UINT32 index);

static inline ACImpl *impl_from_IAudioClient(IAudioClient *iface)
{
    return CONTAINING_RECORD(iface, ACImpl, IAudioClient_iface);
}

static inline ACImpl *impl_from_IAudioRenderClient(IAudioRenderClient *iface)
{
    return CONTAINING_RECORD(iface, ACImpl, IAudioRenderClient_iface);
}

static inline ACImpl *impl_from_IAudioCaptureClient(IAudioCaptureClient *iface)
{
    return CONTAINING_RECORD(iface, ACImpl, IAudioCaptureClient_iface);
}

static inline AudioSessionWrapper *impl_from_IAudioSessionControl2(IAudioSessionControl2 *iface)
{
    return CONTAINING_RECORD(iface, AudioSessionWrapper, IAudioSessionControl2_iface);
}

static inline AudioSessionWrapper *impl_from_ISimpleAudioVolume(ISimpleAudioVolume *iface)
{
    return CONTAINING_RECORD(iface, AudioSessionWrapper, ISimpleAudioVolume_iface);
}

static inline AudioSessionWrapper *impl_from_IChannelAudioVolume(IChannelAudioVolume *iface)
{
    return CONTAINING_RECORD(iface, AudioSessionWrapper, IChannelAudioVolume_iface);
}

static inline ACImpl *impl_from_IAudioClock(IAudioClock *iface)
{
    return CONTAINING_RECORD(iface, ACImpl, IAudioClock_iface);
}

static inline ACImpl *impl_from_IAudioClock2(IAudioClock2 *iface)
{
    return CONTAINING_RECORD(iface, ACImpl, IAudioClock2_iface);
}

static inline ACImpl *impl_from_IAudioStreamVolume(IAudioStreamVolume *iface)
{
    return CONTAINING_RECORD(iface, ACImpl, IAudioStreamVolume_iface);
}

static inline SessionMgr *impl_from_IAudioSessionManager2(IAudioSessionManager2 *iface)
{
    return CONTAINING_RECORD(iface, SessionMgr, IAudioSessionManager2_iface);
}

BOOL WINAPI DllMain(HINSTANCE dll, DWORD reason, void *reserved)
{
    switch (reason)
    {
    case DLL_PROCESS_ATTACH:
        g_timer_q = CreateTimerQueue();
        if(!g_timer_q)
            return FALSE;
        break;

    case DLL_PROCESS_DETACH:
        DeleteCriticalSection(&g_sessions_lock);
        break;
    }
    return TRUE;
}

/* From <dlls/mmdevapi/mmdevapi.h> */
enum DriverPriority {
    Priority_Unavailable = 0,
    Priority_Low,
    Priority_Neutral,
    Priority_Preferred
};

int WINAPI AUDDRV_GetPriority(void)
{
    return Priority_Neutral;
}

static void set_device_guid(EDataFlow flow, HKEY drv_key, const WCHAR *key_name,
        GUID *guid)
{
    HKEY key;
    BOOL opened = FALSE;
    LONG lr;

    if(!drv_key){
        lr = RegCreateKeyExW(HKEY_CURRENT_USER, drv_key_devicesW, 0, NULL, 0, KEY_WRITE,
                    NULL, &drv_key, NULL);
        if(lr != ERROR_SUCCESS){
            ERR("RegCreateKeyEx(drv_key) failed: %u\n", lr);
            return;
        }
        opened = TRUE;
    }

    lr = RegCreateKeyExW(drv_key, key_name, 0, NULL, 0, KEY_WRITE,
                NULL, &key, NULL);
    if(lr != ERROR_SUCCESS){
        ERR("RegCreateKeyEx(%s) failed: %u\n", wine_dbgstr_w(key_name), lr);
        goto exit;
    }

    lr = RegSetValueExW(key, guidW, 0, REG_BINARY, (BYTE*)guid,
                sizeof(GUID));
    if(lr != ERROR_SUCCESS)
        ERR("RegSetValueEx(%s\\guid) failed: %u\n", wine_dbgstr_w(key_name), lr);

    RegCloseKey(key);
exit:
    if(opened)
        RegCloseKey(drv_key);
}

static void get_device_guid(EDataFlow flow, AudioDeviceID device, GUID *guid)
{
    HKEY key = NULL, dev_key;
    DWORD type, size = sizeof(*guid);
    WCHAR key_name[256];

    static const WCHAR key_fmt[] = {'%','u',0};

    if(flow == eCapture)
        key_name[0] = '1';
    else
        key_name[0] = '0';
    key_name[1] = ',';

    sprintfW(key_name + 2, key_fmt, device);

    if(RegOpenKeyExW(HKEY_CURRENT_USER, drv_key_devicesW, 0, KEY_WRITE|KEY_READ, &key) == ERROR_SUCCESS){
        if(RegOpenKeyExW(key, key_name, 0, KEY_READ, &dev_key) == ERROR_SUCCESS){
            if(RegQueryValueExW(dev_key, guidW, 0, &type,
                        (BYTE*)guid, &size) == ERROR_SUCCESS){
                if(type == REG_BINARY){
                    RegCloseKey(dev_key);
                    RegCloseKey(key);
                    return;
                }
                ERR("Invalid type for device %s GUID: %u; ignoring and overwriting\n",
                        wine_dbgstr_w(key_name), type);
            }
            RegCloseKey(dev_key);
        }
    }

    CoCreateGuid(guid);

    set_device_guid(flow, key, key_name, guid);

    if(key)
        RegCloseKey(key);
}

HRESULT WINAPI AUDDRV_GetEndpointIDs(EDataFlow flow, WCHAR ***ids,
        GUID **guids, UINT *num, UINT *def_index)
{
    UInt32 devsize, size;
    AudioDeviceID *devices;
    AudioDeviceID default_id;
    AudioObjectPropertyAddress addr;
    OSStatus sc;
    int i, ndevices;

    TRACE("%d %p %p %p\n", flow, ids, num, def_index);

    addr.mScope = kAudioObjectPropertyScopeGlobal;
    addr.mElement = kAudioObjectPropertyElementMaster;
    if(flow == eRender)
        addr.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
    else if(flow == eCapture)
        addr.mSelector = kAudioHardwarePropertyDefaultInputDevice;
    else
        return E_INVALIDARG;

    size = sizeof(default_id);
    sc = AudioObjectGetPropertyData(kAudioObjectSystemObject, &addr, 0,
            NULL, &size, &default_id);
    if(sc != noErr){
        WARN("Getting _DefaultInputDevice property failed: %lx\n", sc);
        default_id = -1;
    }

    addr.mSelector = kAudioHardwarePropertyDevices;
    sc = AudioObjectGetPropertyDataSize(kAudioObjectSystemObject, &addr, 0,
            NULL, &devsize);
    if(sc != noErr){
        WARN("Getting _Devices property size failed: %lx\n", sc);
        return E_FAIL;
    }

    devices = HeapAlloc(GetProcessHeap(), 0, devsize);
    if(!devices)
        return E_OUTOFMEMORY;

    sc = AudioObjectGetPropertyData(kAudioObjectSystemObject, &addr, 0, NULL,
            &devsize, devices);
    if(sc != noErr){
        WARN("Getting _Devices property failed: %lx\n", sc);
        HeapFree(GetProcessHeap(), 0, devices);
        return E_FAIL;
    }

    ndevices = devsize / sizeof(AudioDeviceID);

    *ids = HeapAlloc(GetProcessHeap(), 0, ndevices * sizeof(WCHAR *));
    if(!*ids){
        HeapFree(GetProcessHeap(), 0, devices);
        return E_OUTOFMEMORY;
    }

    *guids = HeapAlloc(GetProcessHeap(), 0, ndevices * sizeof(GUID));
    if(!*ids){
        HeapFree(GetProcessHeap(), 0, *ids);
        HeapFree(GetProcessHeap(), 0, devices);
        return E_OUTOFMEMORY;
    }

    *num = 0;
    *def_index = (UINT)-1;
    for(i = 0; i < ndevices; ++i){
        AudioBufferList *buffers;
        CFStringRef name;
        SIZE_T len;
        int j;

        addr.mSelector = kAudioDevicePropertyStreamConfiguration;
        if(flow == eRender)
            addr.mScope = kAudioDevicePropertyScopeOutput;
        else
            addr.mScope = kAudioDevicePropertyScopeInput;
        addr.mElement = 0;
        sc = AudioObjectGetPropertyDataSize(devices[i], &addr, 0, NULL, &size);
        if(sc != noErr){
            WARN("Unable to get _StreamConfiguration property size for "
                    "device %lu: %lx\n", devices[i], sc);
            continue;
        }

        buffers = HeapAlloc(GetProcessHeap(), 0, size);
        if(!buffers){
            HeapFree(GetProcessHeap(), 0, devices);
            for(j = 0; j < *num; ++j)
                HeapFree(GetProcessHeap(), 0, (*ids)[j]);
            HeapFree(GetProcessHeap(), 0, *guids);
            HeapFree(GetProcessHeap(), 0, *ids);
            return E_OUTOFMEMORY;
        }

        sc = AudioObjectGetPropertyData(devices[i], &addr, 0, NULL,
                &size, buffers);
        if(sc != noErr){
            WARN("Unable to get _StreamConfiguration property for "
                    "device %lu: %lx\n", devices[i], sc);
            HeapFree(GetProcessHeap(), 0, buffers);
            continue;
        }

        /* check that there's at least one channel in this device before
         * we claim it as usable */
        for(j = 0; j < buffers->mNumberBuffers; ++j)
            if(buffers->mBuffers[j].mNumberChannels > 0)
                break;
        if(j >= buffers->mNumberBuffers){
            HeapFree(GetProcessHeap(), 0, buffers);
            continue;
        }

        HeapFree(GetProcessHeap(), 0, buffers);

        size = sizeof(name);
        addr.mSelector = kAudioObjectPropertyName;
        sc = AudioObjectGetPropertyData(devices[i], &addr, 0, NULL,
                &size, &name);
        if(sc != noErr){
            WARN("Unable to get _Name property for device %lu: %lx\n",
                    devices[i], sc);
            continue;
        }

        len = CFStringGetLength(name) + 1;
        (*ids)[*num] = HeapAlloc(GetProcessHeap(), 0, len * sizeof(WCHAR));
        if(!(*ids)[*num]){
            CFRelease(name);
            HeapFree(GetProcessHeap(), 0, devices);
            for(j = 0; j < *num; ++j)
                HeapFree(GetProcessHeap(), 0, (*ids)[j]);
            HeapFree(GetProcessHeap(), 0, *ids);
            HeapFree(GetProcessHeap(), 0, *guids);
            return E_OUTOFMEMORY;
        }
        CFStringGetCharacters(name, CFRangeMake(0, len - 1), (UniChar*)(*ids)[*num]);
        ((*ids)[*num])[len - 1] = 0;
        CFRelease(name);

        get_device_guid(flow, devices[i], &(*guids)[*num]);

        if(*def_index == (UINT)-1 && devices[i] == default_id)
            *def_index = *num;

        TRACE("device %u: id %s key %u%s\n", *num, debugstr_w((*ids)[*num]),
              (unsigned int)devices[i], (*def_index == *num) ? " (default)" : "");

        (*num)++;
    }

    if(*def_index == (UINT)-1)
        *def_index = 0;

    HeapFree(GetProcessHeap(), 0, devices);

    return S_OK;
}

static BOOL get_deviceid_by_guid(GUID *guid, AudioDeviceID *id, EDataFlow *flow)
{
    HKEY devices_key;
    UINT i = 0;
    WCHAR key_name[256];
    DWORD key_name_size;

    if(RegOpenKeyExW(HKEY_CURRENT_USER, drv_key_devicesW, 0, KEY_READ, &devices_key) != ERROR_SUCCESS){
        ERR("No devices in registry?\n");
        return FALSE;
    }

    while(1){
        HKEY key;
        DWORD size, type;
        GUID reg_guid;

        key_name_size = sizeof(key_name);
        if(RegEnumKeyExW(devices_key, i, key_name, &key_name_size, NULL,
                NULL, NULL, NULL) != ERROR_SUCCESS)
            break;

        if(RegOpenKeyExW(devices_key, key_name, 0, KEY_READ, &key) != ERROR_SUCCESS){
            WARN("Couldn't open key: %s\n", wine_dbgstr_w(key_name));
            continue;
        }

        size = sizeof(reg_guid);
        if(RegQueryValueExW(key, guidW, 0, &type,
                    (BYTE*)&reg_guid, &size) == ERROR_SUCCESS){
            if(IsEqualGUID(&reg_guid, guid)){
                RegCloseKey(key);
                RegCloseKey(devices_key);

                TRACE("Found matching device key: %s\n", wine_dbgstr_w(key_name));

                if(key_name[0] == '0')
                    *flow = eRender;
                else if(key_name[0] == '1')
                    *flow = eCapture;
                else{
                    ERR("Unknown device type: %c\n", key_name[0]);
                    return FALSE;
                }

                *id = strtoulW(key_name + 2, NULL, 10);

                return TRUE;
            }
        }

        RegCloseKey(key);

        ++i;
    }

    RegCloseKey(devices_key);

    WARN("No matching device in registry for GUID %s\n", debugstr_guid(guid));

    return FALSE;
}

HRESULT WINAPI AUDDRV_GetAudioEndpoint(GUID *guid, IMMDevice *dev, IAudioClient **out)
{
    ACImpl *This;
    AudioDeviceID adevid;
    EDataFlow dataflow;

    TRACE("%s %p %p\n", debugstr_guid(guid), dev, out);

    if(!get_deviceid_by_guid(guid, &adevid, &dataflow))
        return AUDCLNT_E_DEVICE_INVALIDATED;

    This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(ACImpl));
    if(!This)
        return E_OUTOFMEMORY;

    This->IAudioClient_iface.lpVtbl = &AudioClient_Vtbl;
    This->IAudioRenderClient_iface.lpVtbl = &AudioRenderClient_Vtbl;
    This->IAudioCaptureClient_iface.lpVtbl = &AudioCaptureClient_Vtbl;
    This->IAudioClock_iface.lpVtbl = &AudioClock_Vtbl;
    This->IAudioClock2_iface.lpVtbl = &AudioClock2_Vtbl;
    This->IAudioStreamVolume_iface.lpVtbl = &AudioStreamVolume_Vtbl;

    This->dataflow = dataflow;

    if(dataflow == eRender)
        This->scope = kAudioDevicePropertyScopeOutput;
    else if(dataflow == eCapture)
        This->scope = kAudioDevicePropertyScopeInput;
    else{
        HeapFree(GetProcessHeap(), 0, This);
        return E_INVALIDARG;
    }

    This->lock = 0;

    This->parent = dev;
    IMMDevice_AddRef(This->parent);

    list_init(&This->avail_buffers);
    list_init(&This->queued_buffers);
    list_init(&This->queued_bufinfos);

    This->adevid = adevid;

    *out = &This->IAudioClient_iface;
    IAudioClient_AddRef(&This->IAudioClient_iface);

    return S_OK;
}

/* current position from start of stream */
#define BUFPOS_ABSOLUTE 1
/* current position from start of this buffer */
#define BUFPOS_RELATIVE 2

static UINT64 get_current_aqbuffer_position(ACImpl *This, int mode)
{
    struct list *head;
    QueuedBufInfo *bufinfo;
    UINT64 ret;

    head = list_head(&This->queued_bufinfos);
    if(!head){
        TRACE("No buffers queued\n");
        if(mode == BUFPOS_ABSOLUTE)
            return This->written_frames;
        return 0;
    }
    bufinfo = LIST_ENTRY(head, QueuedBufInfo, entry);

    if(This->playing == StatePlaying){
        AudioTimeStamp tstamp;
        OSStatus sc;

        /* AudioQueueGetCurrentTime() is brain damaged. The returned
         * mSampleTime member jumps backwards seemingly at random, so
         * we record the highest sampletime and use that during these
         * anomalies.
         *
         * It also behaves poorly when the queue is paused, jumping
         * forwards during the pause and backwards again after resuming.
         * So we record the sampletime when the queue is paused and use
         * that. */
        sc = AudioQueueGetCurrentTime(This->aqueue, NULL, &tstamp, NULL);
        if(sc != noErr){
            if(sc != kAudioQueueErr_InvalidRunState)
                WARN("Unable to get current time: %lx\n", sc);
            return 0;
        }

        if(!(tstamp.mFlags & kAudioTimeStampSampleTimeValid)){
            FIXME("SampleTime not valid: %lx\n", tstamp.mFlags);
            return 0;
        }

        if(tstamp.mSampleTime > This->highest_sampletime)
            This->highest_sampletime = tstamp.mSampleTime;
    }

    while(This->highest_sampletime > bufinfo->start_sampletime + bufinfo->len_frames){
        This->inbuf_frames -= bufinfo->len_frames;
        list_remove(&bufinfo->entry);
        HeapFree(GetProcessHeap(), 0, bufinfo);

        head = list_head(&This->queued_bufinfos);
        if(!head){
            TRACE("No buffers queued\n");
            if(mode == BUFPOS_ABSOLUTE)
                return This->written_frames;
            return 0;
        }
        bufinfo = LIST_ENTRY(head, QueuedBufInfo, entry);
    }

    if(This->highest_sampletime < bufinfo->start_sampletime)
        ret = 0;
    else
        ret = This->highest_sampletime - bufinfo->start_sampletime;

    if(mode == BUFPOS_ABSOLUTE){
        ret = This->written_frames - (bufinfo->len_frames - ret);
        while((head = list_next(&This->queued_bufinfos, &bufinfo->entry))){
            bufinfo = LIST_ENTRY(head, QueuedBufInfo, entry);
            ret -= bufinfo->len_frames;
        }
    }

    TRACE("%llu frames (%s)\n", ret,
            mode == BUFPOS_ABSOLUTE ? "absolute" : "relative");

    return ret;
}

static void avail_update(ACImpl *This)
{
    AQBuffer *buf, *next;

    LIST_FOR_EACH_ENTRY_SAFE(buf, next, &This->queued_buffers, AQBuffer, entry){
        if(buf->used)
            break;
        if(This->dataflow == eCapture)
            This->inbuf_frames += buf->buf->mAudioDataByteSize / This->fmt->nBlockAlign;
        list_remove(&buf->entry);
        list_add_tail(&This->avail_buffers, &buf->entry);
    }
}

static HRESULT WINAPI AudioClient_QueryInterface(IAudioClient *iface,
        REFIID riid, void **ppv)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;
    if(IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_IAudioClient))
        *ppv = iface;
    if(*ppv){
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }
    WARN("Unknown interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI AudioClient_AddRef(IAudioClient *iface)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    ULONG ref;
    ref = InterlockedIncrement(&This->ref);
    TRACE("(%p) Refcount now %u\n", This, ref);
    return ref;
}

static ULONG WINAPI AudioClient_Release(IAudioClient *iface)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    ULONG ref;
    ref = InterlockedDecrement(&This->ref);
    TRACE("(%p) Refcount now %u\n", This, ref);
    if(!ref){
        if(This->aqueue){
            AQBuffer *buf, *next;
            QueuedBufInfo *bufinfo, *bufinfo2;

            if(This->public_buffer){
                buf = This->public_buffer->mUserData;
                list_add_tail(&This->avail_buffers, &buf->entry);
            }

            IAudioClient_Stop(iface);
            AudioQueueStop(This->aqueue, 1);

            /* Stopped synchronously, all buffers returned. */
            list_move_tail(&This->avail_buffers, &This->queued_buffers);
            LIST_FOR_EACH_ENTRY_SAFE(buf, next, &This->avail_buffers, AQBuffer, entry){
                AudioQueueFreeBuffer(This->aqueue, buf->buf);
                HeapFree(GetProcessHeap(), 0, buf);
            }

            LIST_FOR_EACH_ENTRY_SAFE(bufinfo, bufinfo2, &This->queued_bufinfos,
                    QueuedBufInfo, entry)
                HeapFree(GetProcessHeap(), 0, bufinfo);

            AudioQueueDispose(This->aqueue, 1);
        }
        if(This->session){
            EnterCriticalSection(&g_sessions_lock);
            list_remove(&This->entry);
            LeaveCriticalSection(&g_sessions_lock);
        }
        HeapFree(GetProcessHeap(), 0, This->vols);
        CoTaskMemFree(This->fmt);
        IMMDevice_Release(This->parent);
        HeapFree(GetProcessHeap(), 0, This);
    }
    return ref;
}

static void dump_fmt(const WAVEFORMATEX *fmt)
{
    TRACE("wFormatTag: 0x%x (", fmt->wFormatTag);
    switch(fmt->wFormatTag){
    case WAVE_FORMAT_PCM:
        TRACE("WAVE_FORMAT_PCM");
        break;
    case WAVE_FORMAT_IEEE_FLOAT:
        TRACE("WAVE_FORMAT_IEEE_FLOAT");
        break;
    case WAVE_FORMAT_EXTENSIBLE:
        TRACE("WAVE_FORMAT_EXTENSIBLE");
        break;
    default:
        TRACE("Unknown");
        break;
    }
    TRACE(")\n");

    TRACE("nChannels: %u\n", fmt->nChannels);
    TRACE("nSamplesPerSec: %u\n", fmt->nSamplesPerSec);
    TRACE("nAvgBytesPerSec: %u\n", fmt->nAvgBytesPerSec);
    TRACE("nBlockAlign: %u\n", fmt->nBlockAlign);
    TRACE("wBitsPerSample: %u\n", fmt->wBitsPerSample);
    TRACE("cbSize: %u\n", fmt->cbSize);

    if(fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE){
        WAVEFORMATEXTENSIBLE *fmtex = (void*)fmt;
        TRACE("dwChannelMask: %08x\n", fmtex->dwChannelMask);
        TRACE("Samples: %04x\n", fmtex->Samples.wReserved);
        TRACE("SubFormat: %s\n", wine_dbgstr_guid(&fmtex->SubFormat));
    }
}

static DWORD get_channel_mask(unsigned int channels)
{
    switch(channels){
    case 0:
        return 0;
    case 1:
        return KSAUDIO_SPEAKER_MONO;
    case 2:
        return KSAUDIO_SPEAKER_STEREO;
    case 3:
        return KSAUDIO_SPEAKER_STEREO | SPEAKER_LOW_FREQUENCY;
    case 4:
        return KSAUDIO_SPEAKER_QUAD;    /* not _SURROUND */
    case 5:
        return KSAUDIO_SPEAKER_QUAD | SPEAKER_LOW_FREQUENCY;
    case 6:
        return KSAUDIO_SPEAKER_5POINT1; /* not 5POINT1_SURROUND */
    case 7:
        return KSAUDIO_SPEAKER_5POINT1 | SPEAKER_BACK_CENTER;
    case 8:
        return KSAUDIO_SPEAKER_7POINT1_SURROUND; /* Vista deprecates 7POINT1 */
    }
    FIXME("Unknown speaker configuration: %u\n", channels);
    return 0;
}

static WAVEFORMATEX *clone_format(const WAVEFORMATEX *fmt)
{
    WAVEFORMATEX *ret;
    size_t size;

    if(fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
        size = sizeof(WAVEFORMATEXTENSIBLE);
    else
        size = sizeof(WAVEFORMATEX);

    ret = CoTaskMemAlloc(size);
    if(!ret)
        return NULL;

    memcpy(ret, fmt, size);

    ret->cbSize = size - sizeof(WAVEFORMATEX);

    return ret;
}

static HRESULT ca_get_audiodesc(AudioStreamBasicDescription *desc,
        const WAVEFORMATEX *fmt)
{
    const WAVEFORMATEXTENSIBLE *fmtex = (const WAVEFORMATEXTENSIBLE *)fmt;

    desc->mFormatFlags = 0;

    if(fmt->wFormatTag == WAVE_FORMAT_PCM ||
            (fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))){
        desc->mFormatID = kAudioFormatLinearPCM;
        if(fmt->wBitsPerSample > 8)
            desc->mFormatFlags = kAudioFormatFlagIsSignedInteger;
    }else if(fmt->wFormatTag == WAVE_FORMAT_IEEE_FLOAT ||
            (fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_IEEE_FLOAT))){
        desc->mFormatID = kAudioFormatLinearPCM;
        desc->mFormatFlags = kAudioFormatFlagIsFloat;
    }else if(fmt->wFormatTag == WAVE_FORMAT_MULAW ||
            (fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_MULAW))){
        desc->mFormatID = kAudioFormatULaw;
    }else if(fmt->wFormatTag == WAVE_FORMAT_ALAW ||
            (fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_ALAW))){
        desc->mFormatID = kAudioFormatALaw;
    }else
        return AUDCLNT_E_UNSUPPORTED_FORMAT;

    desc->mSampleRate = fmt->nSamplesPerSec;
    desc->mBytesPerPacket = fmt->nBlockAlign;
    desc->mFramesPerPacket = 1;
    desc->mBytesPerFrame = fmt->nBlockAlign;
    desc->mChannelsPerFrame = fmt->nChannels;
    desc->mBitsPerChannel = fmt->wBitsPerSample;
    desc->mReserved = 0;

    return S_OK;
}

/* We can't use debug printing or {Enter,Leave}CriticalSection from
 * OSX callback threads.  We may use OSSpinLock.
 * OSSpinLock is not a recursive lock, so don't call
 * synchronized functions while holding the lock. */
static void ca_out_buffer_cb(void *user, AudioQueueRef aqueue,
        AudioQueueBufferRef buffer)
{
    AQBuffer *buf = buffer->mUserData;

    buf->used = FALSE;
}

static void ca_in_buffer_cb(void *user, AudioQueueRef aqueue,
        AudioQueueBufferRef buffer, const AudioTimeStamp *start,
        UInt32 ndesc, const AudioStreamPacketDescription *descs)
{
    AQBuffer *buf = buffer->mUserData;

    buf->used = FALSE;
    /* let's update inbuf_frames synchronously without OSAddAtomic */
}

static HRESULT ca_setup_aqueue(AudioDeviceID did, EDataFlow flow,
        const WAVEFORMATEX *fmt, void *user, AudioQueueRef *aqueue)
{
    AudioStreamBasicDescription desc;
    AudioObjectPropertyAddress addr;
    CFStringRef uid;
    OSStatus sc;
    HRESULT hr;
    UInt32 size;

    addr.mScope = kAudioObjectPropertyScopeGlobal;
    addr.mElement = 0;
    addr.mSelector = kAudioDevicePropertyDeviceUID;

    size = sizeof(uid);
    sc = AudioObjectGetPropertyData(did, &addr, 0, NULL, &size, &uid);
    if(sc != noErr){
        WARN("Unable to get _DeviceUID property: %lx\n", sc);
        return E_FAIL;
    }

    hr = ca_get_audiodesc(&desc, fmt);
    if(FAILED(hr)){
        CFRelease(uid);
        return hr;
    }

    if(flow == eRender)
        sc = AudioQueueNewOutput(&desc, ca_out_buffer_cb, user, NULL, NULL, 0,
                aqueue);
    else if(flow == eCapture)
        sc = AudioQueueNewInput(&desc, ca_in_buffer_cb, user, NULL, NULL, 0,
                aqueue);
    else{
        CFRelease(uid);
        return E_UNEXPECTED;
    }
    if(sc != noErr){
        WARN("Unable to create AudioQueue: %lx\n", sc);
        CFRelease(uid);
        return E_FAIL;
    }

    sc = AudioQueueSetProperty(*aqueue, kAudioQueueProperty_CurrentDevice,
            &uid, sizeof(uid));
    if(sc != noErr){
        CFRelease(uid);
        return E_FAIL;
    }

    CFRelease(uid);

    return S_OK;
}

static void session_init_vols(AudioSession *session, UINT channels)
{
    if(session->channel_count < channels){
        UINT i;

        if(session->channel_vols)
            session->channel_vols = HeapReAlloc(GetProcessHeap(), 0,
                    session->channel_vols, sizeof(float) * channels);
        else
            session->channel_vols = HeapAlloc(GetProcessHeap(), 0,
                    sizeof(float) * channels);
        if(!session->channel_vols)
            return;

        for(i = session->channel_count; i < channels; ++i)
            session->channel_vols[i] = 1.f;

        session->channel_count = channels;
    }
}

static AudioSession *create_session(const GUID *guid, IMMDevice *device,
        UINT num_channels)
{
    AudioSession *ret;

    ret = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(AudioSession));
    if(!ret)
        return NULL;

    memcpy(&ret->guid, guid, sizeof(GUID));

    ret->device = device;

    list_init(&ret->clients);

    list_add_head(&g_sessions, &ret->entry);

    InitializeCriticalSection(&ret->lock);
    ret->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": AudioSession.lock");

    session_init_vols(ret, num_channels);

    ret->master_vol = 1.f;

    return ret;
}

/* if channels == 0, then this will return or create a session with
 * matching dataflow and GUID. otherwise, channels must also match */
static HRESULT get_audio_session(const GUID *sessionguid,
        IMMDevice *device, UINT channels, AudioSession **out)
{
    AudioSession *session;

    if(!sessionguid || IsEqualGUID(sessionguid, &GUID_NULL)){
        *out = create_session(&GUID_NULL, device, channels);
        if(!*out)
            return E_OUTOFMEMORY;

        return S_OK;
    }

    *out = NULL;
    LIST_FOR_EACH_ENTRY(session, &g_sessions, AudioSession, entry){
        if(session->device == device &&
                IsEqualGUID(sessionguid, &session->guid)){
            session_init_vols(session, channels);
            *out = session;
            break;
        }
    }

    if(!*out){
        *out = create_session(sessionguid, device, channels);
        if(!*out)
            return E_OUTOFMEMORY;
    }

    return S_OK;
}

static HRESULT WINAPI AudioClient_Initialize(IAudioClient *iface,
        AUDCLNT_SHAREMODE mode, DWORD flags, REFERENCE_TIME duration,
        REFERENCE_TIME period, const WAVEFORMATEX *fmt,
        const GUID *sessionguid)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    HRESULT hr;
    OSStatus sc;
    int i;

    TRACE("(%p)->(%x, %x, %s, %s, %p, %s)\n", This, mode, flags,
          wine_dbgstr_longlong(duration), wine_dbgstr_longlong(period), fmt, debugstr_guid(sessionguid));

    if(!fmt)
        return E_POINTER;

    dump_fmt(fmt);

    if(mode != AUDCLNT_SHAREMODE_SHARED && mode != AUDCLNT_SHAREMODE_EXCLUSIVE)
        return AUDCLNT_E_NOT_INITIALIZED;

    if(flags & ~(AUDCLNT_STREAMFLAGS_CROSSPROCESS |
                AUDCLNT_STREAMFLAGS_LOOPBACK |
                AUDCLNT_STREAMFLAGS_EVENTCALLBACK |
                AUDCLNT_STREAMFLAGS_NOPERSIST |
                AUDCLNT_STREAMFLAGS_RATEADJUST |
                AUDCLNT_SESSIONFLAGS_EXPIREWHENUNOWNED |
                AUDCLNT_SESSIONFLAGS_DISPLAY_HIDE |
                AUDCLNT_SESSIONFLAGS_DISPLAY_HIDEWHENEXPIRED)){
        TRACE("Unknown flags: %08x\n", flags);
        return E_INVALIDARG;
    }

    if(mode == AUDCLNT_SHAREMODE_SHARED){
        period = DefaultPeriod;
        if( duration < 3 * period)
            duration = 3 * period;
    }else{
        if(!period)
            period = DefaultPeriod; /* not minimum */
        if(period < MinimumPeriod || period > 5000000)
            return AUDCLNT_E_INVALID_DEVICE_PERIOD;
        if(duration > 20000000) /* the smaller the period, the lower this limit */
            return AUDCLNT_E_BUFFER_SIZE_ERROR;
        if(flags & AUDCLNT_STREAMFLAGS_EVENTCALLBACK){
            if(duration != period)
                return AUDCLNT_E_BUFDURATION_PERIOD_NOT_EQUAL;
            FIXME("EXCLUSIVE mode with EVENTCALLBACK\n");
            return AUDCLNT_E_DEVICE_IN_USE;
        }else{
            if( duration < 8 * period)
                duration = 8 * period; /* may grow above 2s */
        }
    }

    OSSpinLockLock(&This->lock);

    if(This->aqueue){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_ALREADY_INITIALIZED;
    }

    hr = ca_setup_aqueue(This->adevid, This->dataflow, fmt, This, &This->aqueue);
    if(FAILED(hr)){
        OSSpinLockUnlock(&This->lock);
        return hr;
    }

    This->fmt = clone_format(fmt);
    if(!This->fmt){
        AudioQueueDispose(This->aqueue, 1);
        This->aqueue = NULL;
        OSSpinLockUnlock(&This->lock);
        return E_OUTOFMEMORY;
    }

    This->period_ms = period / 10000;

    This->bufsize_frames = MulDiv(duration, fmt->nSamplesPerSec, 10000000);

    if(This->dataflow == eCapture){
        int i;
        UInt32 bsize = ceil((This->bufsize_frames / (double)CAPTURE_BUFFERS) *
                This->fmt->nBlockAlign);
        for(i = 0; i < CAPTURE_BUFFERS; ++i){
            AQBuffer *buf;

            buf = HeapAlloc(GetProcessHeap(), 0, sizeof(AQBuffer));
            if(!buf){
                AudioQueueDispose(This->aqueue, 1);
                This->aqueue = NULL;
                CoTaskMemFree(This->fmt);
                This->fmt = NULL;
                OSSpinLockUnlock(&This->lock);
                return E_OUTOFMEMORY;
            }

            sc = AudioQueueAllocateBuffer(This->aqueue, bsize, &buf->buf);
            if(sc != noErr){
                AudioQueueDispose(This->aqueue, 1);
                This->aqueue = NULL;
                CoTaskMemFree(This->fmt);
                This->fmt = NULL;
                OSSpinLockUnlock(&This->lock);
                WARN("Couldn't allocate buffer: %lx\n", sc);
                return E_FAIL;
            }

            buf->buf->mUserData = buf;
            buf->used = TRUE;
            sc = AudioQueueEnqueueBuffer(This->aqueue, buf->buf, 0, NULL);
            if(sc != noErr){
                ERR("Couldn't enqueue buffer: %lx\n", sc);
                break;
            }
            list_add_tail(&This->queued_buffers, &buf->entry);
        }
    }

    This->vols = HeapAlloc(GetProcessHeap(), 0, fmt->nChannels * sizeof(float));
    if(!This->vols){
        AudioQueueDispose(This->aqueue, 1);
        This->aqueue = NULL;
        CoTaskMemFree(This->fmt);
        This->fmt = NULL;
        OSSpinLockUnlock(&This->lock);
        return E_OUTOFMEMORY;
    }

    for(i = 0; i < fmt->nChannels; ++i)
        This->vols[i] = 1.f;

    This->share = mode;
    This->flags = flags;

    EnterCriticalSection(&g_sessions_lock);

    hr = get_audio_session(sessionguid, This->parent, fmt->nChannels,
            &This->session);
    if(FAILED(hr)){
        LeaveCriticalSection(&g_sessions_lock);
        AudioQueueDispose(This->aqueue, 1);
        This->aqueue = NULL;
        CoTaskMemFree(This->fmt);
        This->fmt = NULL;
        HeapFree(GetProcessHeap(), 0, This->vols);
        This->vols = NULL;
        OSSpinLockUnlock(&This->lock);
        return E_INVALIDARG;
    }

    list_add_tail(&This->session->clients, &This->entry);

    LeaveCriticalSection(&g_sessions_lock);

    ca_setvol(This, -1);

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static HRESULT WINAPI AudioClient_GetBufferSize(IAudioClient *iface,
        UINT32 *frames)
{
    ACImpl *This = impl_from_IAudioClient(iface);

    TRACE("(%p)->(%p)\n", This, frames);

    if(!frames)
        return E_POINTER;

    OSSpinLockLock(&This->lock);

    if(!This->aqueue){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_NOT_INITIALIZED;
    }

    *frames = This->bufsize_frames;

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static HRESULT ca_get_max_stream_latency(ACImpl *This, UInt32 *max)
{
    AudioObjectPropertyAddress addr;
    AudioStreamID *ids;
    UInt32 size;
    OSStatus sc;
    int nstreams, i;

    addr.mScope = This->scope;
    addr.mElement = 0;
    addr.mSelector = kAudioDevicePropertyStreams;

    sc = AudioObjectGetPropertyDataSize(This->adevid, &addr, 0, NULL,
            &size);
    if(sc != noErr){
        WARN("Unable to get size for _Streams property: %lx\n", sc);
        return E_FAIL;
    }

    ids = HeapAlloc(GetProcessHeap(), 0, size);
    if(!ids)
        return E_OUTOFMEMORY;

    sc = AudioObjectGetPropertyData(This->adevid, &addr, 0, NULL, &size, ids);
    if(sc != noErr){
        WARN("Unable to get _Streams property: %lx\n", sc);
        HeapFree(GetProcessHeap(), 0, ids);
        return E_FAIL;
    }

    nstreams = size / sizeof(AudioStreamID);
    *max = 0;

    addr.mSelector = kAudioStreamPropertyLatency;
    for(i = 0; i < nstreams; ++i){
        UInt32 latency;

        size = sizeof(latency);
        sc = AudioObjectGetPropertyData(ids[i], &addr, 0, NULL,
                &size, &latency);
        if(sc != noErr){
            WARN("Unable to get _Latency property: %lx\n", sc);
            continue;
        }

        if(latency > *max)
            *max = latency;
    }

    HeapFree(GetProcessHeap(), 0, ids);

    return S_OK;
}

static HRESULT WINAPI AudioClient_GetStreamLatency(IAudioClient *iface,
        REFERENCE_TIME *out)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    UInt32 latency, stream_latency, size;
    AudioObjectPropertyAddress addr;
    OSStatus sc;
    HRESULT hr;

    TRACE("(%p)->(%p)\n", This, out);

    if(!out)
        return E_POINTER;

    OSSpinLockLock(&This->lock);

    if(!This->aqueue){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_NOT_INITIALIZED;
    }

    addr.mScope = This->scope;
    addr.mSelector = kAudioDevicePropertyLatency;
    addr.mElement = 0;

    size = sizeof(latency);
    sc = AudioObjectGetPropertyData(This->adevid, &addr, 0, NULL,
            &size, &latency);
    if(sc != noErr){
        WARN("Couldn't get _Latency property: %lx\n", sc);
        OSSpinLockUnlock(&This->lock);
        return E_FAIL;
    }

    hr = ca_get_max_stream_latency(This, &stream_latency);
    if(FAILED(hr)){
        OSSpinLockUnlock(&This->lock);
        return hr;
    }

    latency += stream_latency;
    /* pretend we process audio in Period chunks, so max latency includes
     * the period time */
    *out = MulDiv(latency, 10000000, This->fmt->nSamplesPerSec)
         + This->period_ms * 10000;

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static HRESULT AudioClient_GetCurrentPadding_nolock(ACImpl *This,
        UINT32 *numpad)
{
    if(!This->aqueue)
        return AUDCLNT_E_NOT_INITIALIZED;

    avail_update(This);

    if(This->dataflow == eRender){
        UINT64 bufpos;
        bufpos = get_current_aqbuffer_position(This, BUFPOS_RELATIVE);
        *numpad = This->inbuf_frames - bufpos;
    }else
        *numpad = This->inbuf_frames;

    return S_OK;
}

static HRESULT WINAPI AudioClient_GetCurrentPadding(IAudioClient *iface,
        UINT32 *numpad)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    HRESULT hr;

    TRACE("(%p)->(%p)\n", This, numpad);

    if(!numpad)
        return E_POINTER;

    OSSpinLockLock(&This->lock);

    hr = AudioClient_GetCurrentPadding_nolock(This, numpad);

    OSSpinLockUnlock(&This->lock);

    return hr;
}

static HRESULT WINAPI AudioClient_IsFormatSupported(IAudioClient *iface,
        AUDCLNT_SHAREMODE mode, const WAVEFORMATEX *pwfx,
        WAVEFORMATEX **outpwfx)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    WAVEFORMATEXTENSIBLE *fmtex = (WAVEFORMATEXTENSIBLE*)pwfx;
    AudioQueueRef aqueue;
    HRESULT hr;

    TRACE("(%p)->(%x, %p, %p)\n", This, mode, pwfx, outpwfx);

    if(!pwfx || (mode == AUDCLNT_SHAREMODE_SHARED && !outpwfx))
        return E_POINTER;

    if(mode != AUDCLNT_SHAREMODE_SHARED && mode != AUDCLNT_SHAREMODE_EXCLUSIVE)
        return E_INVALIDARG;

    if(pwfx->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
            pwfx->cbSize < sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX))
        return E_INVALIDARG;

    dump_fmt(pwfx);

    if(outpwfx)
        *outpwfx = NULL;

    if(pwfx->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
            fmtex->dwChannelMask != 0 &&
            fmtex->dwChannelMask != get_channel_mask(pwfx->nChannels))
        return AUDCLNT_E_UNSUPPORTED_FORMAT;

    OSSpinLockLock(&This->lock);

    hr = ca_setup_aqueue(This->adevid, This->dataflow, pwfx, NULL, &aqueue);
    if(SUCCEEDED(hr)){
        AudioQueueDispose(aqueue, 1);
        OSSpinLockUnlock(&This->lock);
        TRACE("returning %08x\n", S_OK);
        return S_OK;
    }

    OSSpinLockUnlock(&This->lock);

    TRACE("returning %08x\n", AUDCLNT_E_UNSUPPORTED_FORMAT);
    return AUDCLNT_E_UNSUPPORTED_FORMAT;
}

static HRESULT WINAPI AudioClient_GetMixFormat(IAudioClient *iface,
        WAVEFORMATEX **pwfx)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    WAVEFORMATEXTENSIBLE *fmt;
    OSStatus sc;
    UInt32 size;
    Float64 rate;
    AudioBufferList *buffers;
    AudioObjectPropertyAddress addr;
    int i;

    TRACE("(%p)->(%p)\n", This, pwfx);

    if(!pwfx)
        return E_POINTER;
    *pwfx = NULL;

    fmt = CoTaskMemAlloc(sizeof(WAVEFORMATEXTENSIBLE));
    if(!fmt)
        return E_OUTOFMEMORY;

    fmt->Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;

    addr.mScope = This->scope;
    addr.mElement = 0;
    addr.mSelector = kAudioDevicePropertyStreamConfiguration;

    sc = AudioObjectGetPropertyDataSize(This->adevid, &addr, 0, NULL, &size);
    if(sc != noErr){
        CoTaskMemFree(fmt);
        WARN("Unable to get size for _StreamConfiguration property: %lx\n", sc);
        return E_FAIL;
    }

    buffers = HeapAlloc(GetProcessHeap(), 0, size);
    if(!buffers){
        CoTaskMemFree(fmt);
        return E_OUTOFMEMORY;
    }

    sc = AudioObjectGetPropertyData(This->adevid, &addr, 0, NULL,
            &size, buffers);
    if(sc != noErr){
        CoTaskMemFree(fmt);
        HeapFree(GetProcessHeap(), 0, buffers);
        WARN("Unable to get _StreamConfiguration property: %lx\n", sc);
        return E_FAIL;
    }

    fmt->Format.nChannels = 0;
    for(i = 0; i < buffers->mNumberBuffers; ++i)
        fmt->Format.nChannels += buffers->mBuffers[i].mNumberChannels;

    HeapFree(GetProcessHeap(), 0, buffers);

    fmt->dwChannelMask = get_channel_mask(fmt->Format.nChannels);

    addr.mSelector = kAudioDevicePropertyNominalSampleRate;
    size = sizeof(Float64);
    sc = AudioObjectGetPropertyData(This->adevid, &addr, 0, NULL, &size, &rate);
    if(sc != noErr){
        CoTaskMemFree(fmt);
        WARN("Unable to get _NominalSampleRate property: %lx\n", sc);
        return E_FAIL;
    }
    fmt->Format.nSamplesPerSec = rate;

    fmt->Format.wBitsPerSample = 32;
    fmt->SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;

    fmt->Format.nBlockAlign = (fmt->Format.wBitsPerSample *
            fmt->Format.nChannels) / 8;
    fmt->Format.nAvgBytesPerSec = fmt->Format.nSamplesPerSec *
        fmt->Format.nBlockAlign;

    fmt->Samples.wValidBitsPerSample = fmt->Format.wBitsPerSample;
    fmt->Format.cbSize = sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);

    *pwfx = (WAVEFORMATEX*)fmt;
    dump_fmt(*pwfx);

    return S_OK;
}

static HRESULT WINAPI AudioClient_GetDevicePeriod(IAudioClient *iface,
        REFERENCE_TIME *defperiod, REFERENCE_TIME *minperiod)
{
    ACImpl *This = impl_from_IAudioClient(iface);

    TRACE("(%p)->(%p, %p)\n", This, defperiod, minperiod);

    if(!defperiod && !minperiod)
        return E_POINTER;

    if(defperiod)
        *defperiod = DefaultPeriod;
    if(minperiod)
        *minperiod = MinimumPeriod;

    return S_OK;
}

void CALLBACK ca_period_cb(void *user, BOOLEAN timer)
{
    ACImpl *This = user;

    if(This->event)
        SetEvent(This->event);
}

static HRESULT WINAPI AudioClient_Start(IAudioClient *iface)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    OSStatus sc;

    TRACE("(%p)\n", This);

    OSSpinLockLock(&This->lock);

    if(!This->aqueue){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_NOT_INITIALIZED;
    }

    if(This->playing != StateStopped){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_NOT_STOPPED;
    }

    if((This->flags & AUDCLNT_STREAMFLAGS_EVENTCALLBACK) && !This->event){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_EVENTHANDLE_NOT_SET;
    }

    if(This->event)
        if(!CreateTimerQueueTimer(&This->timer, g_timer_q, ca_period_cb,
                This, 0, This->period_ms, WT_EXECUTEINTIMERTHREAD)){
            This->timer = NULL;
            OSSpinLockUnlock(&This->lock);
            WARN("Unable to create timer: %u\n", GetLastError());
            return E_OUTOFMEMORY;
        }

    if(This->dataflow == eCapture){
        UINT32 frames; /* enqueue packets */
        AudioCaptureClient_GetNextPacket(This, &frames);
    }

    This->playing = StateInTransition;

    sc = AudioQueueStart(This->aqueue, NULL);
    if(sc != noErr){
        OSSpinLockUnlock(&This->lock);
        WARN("Unable to start audio queue: %lx\n", sc);
        return E_FAIL;
    }

    This->playing = StatePlaying;

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static HRESULT WINAPI AudioClient_Stop(IAudioClient *iface)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    AudioTimeStamp tstamp;
    OSStatus sc;
    HANDLE event = NULL;
    BOOL wait = FALSE;

    TRACE("(%p)\n", This);

    OSSpinLockLock(&This->lock);

    if(!This->aqueue){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_NOT_INITIALIZED;
    }

    if(This->playing == StateStopped){
        OSSpinLockUnlock(&This->lock);
        return S_FALSE;
    }

    if(This->playing == StateInTransition){
        OSSpinLockUnlock(&This->lock);
        return S_OK;
    }

    if(This->timer){
        event = CreateEventW(NULL, TRUE, FALSE, NULL);
        wait = !DeleteTimerQueueTimer(g_timer_q, This->timer, event);
        This->timer = NULL;
        if(wait)
            WARN("DeleteTimerQueueTimer error %u\n", GetLastError());
        wait = wait && GetLastError() == ERROR_IO_PENDING;
    }

    This->playing = StateInTransition;

    sc = AudioQueueGetCurrentTime(This->aqueue, NULL, &tstamp, NULL);
    if(sc == noErr){
        if(tstamp.mFlags & kAudioTimeStampSampleTimeValid){
            if(tstamp.mSampleTime > This->highest_sampletime)
                This->highest_sampletime = tstamp.mSampleTime;
        }else
            WARN("Returned tstamp mSampleTime not valid: %lx\n", tstamp.mFlags);
    }else
        WARN("GetCurrentTime failed: %lx\n", sc);

    /* Mac OS bug? Our capture callback is no more called past AQStop */
    sc = AudioQueuePause(This->aqueue);
    if(sc != noErr){
        OSSpinLockUnlock(&This->lock);
        WARN("Unable to pause audio queue: %lx\n", sc);
        return E_FAIL;
    }

    This->playing = StateStopped;

    OSSpinLockUnlock(&This->lock);

    if(event && wait)
        WaitForSingleObject(event, INFINITE);
    CloseHandle(event);

    return S_OK;
}

static HRESULT WINAPI AudioClient_Reset(IAudioClient *iface)
{
    ACImpl *This = impl_from_IAudioClient(iface);
    OSStatus sc;
    QueuedBufInfo *bufinfo, *bufinfo2;
    AQBuffer *buf;

    TRACE("(%p)\n", This);

    OSSpinLockLock(&This->lock);

    if(!This->aqueue){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_NOT_INITIALIZED;
    }

    if(This->playing != StateStopped){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_NOT_STOPPED;
    }

    if(This->getbuf_last){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_BUFFER_OPERATION_PENDING;
    }

    avail_update(This); /* going to skip over inbuf_frames */

    LIST_FOR_EACH_ENTRY_SAFE(bufinfo, bufinfo2, &This->queued_bufinfos,
            QueuedBufInfo, entry){
        list_remove(&bufinfo->entry);
        HeapFree(GetProcessHeap(), 0, bufinfo);
    }

    sc = AudioQueueReset(This->aqueue);
    if(sc != noErr){
        OSSpinLockUnlock(&This->lock);
        WARN("Unable to reset audio queue: %lx\n", sc);
        return E_FAIL;
    }

    /* AQReset is synchronous */
    list_move_tail(&This->avail_buffers, &This->queued_buffers);

    if(This->dataflow == eRender){
        This->written_frames = 0;
    }else{
        LIST_FOR_EACH_ENTRY(buf, &This->avail_buffers, AQBuffer, entry)
            buf->buf->mAudioDataByteSize = 0;
        This->written_frames += This->inbuf_frames;
    }
    This->inbuf_frames = 0;

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static HRESULT WINAPI AudioClient_SetEventHandle(IAudioClient *iface,
        HANDLE event)
{
    ACImpl *This = impl_from_IAudioClient(iface);

    TRACE("(%p)->(%p)\n", This, event);

    if(!event)
        return E_INVALIDARG;

    OSSpinLockLock(&This->lock);

    if(!This->aqueue){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_NOT_INITIALIZED;
    }

    if(!(This->flags & AUDCLNT_STREAMFLAGS_EVENTCALLBACK)){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_EVENTHANDLE_NOT_EXPECTED;
    }

    This->event = event;

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static HRESULT WINAPI AudioClient_GetService(IAudioClient *iface, REFIID riid,
        void **ppv)
{
    ACImpl *This = impl_from_IAudioClient(iface);

    TRACE("(%p)->(%s, %p)\n", This, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;

    OSSpinLockLock(&This->lock);

    if(!This->aqueue){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_NOT_INITIALIZED;
    }

    if(IsEqualIID(riid, &IID_IAudioRenderClient)){
        if(This->dataflow != eRender){
            OSSpinLockUnlock(&This->lock);
            return AUDCLNT_E_WRONG_ENDPOINT_TYPE;
        }
        IAudioRenderClient_AddRef(&This->IAudioRenderClient_iface);
        *ppv = &This->IAudioRenderClient_iface;
    }else if(IsEqualIID(riid, &IID_IAudioCaptureClient)){
        if(This->dataflow != eCapture){
            OSSpinLockUnlock(&This->lock);
            return AUDCLNT_E_WRONG_ENDPOINT_TYPE;
        }
        IAudioCaptureClient_AddRef(&This->IAudioCaptureClient_iface);
        *ppv = &This->IAudioCaptureClient_iface;
    }else if(IsEqualIID(riid, &IID_IAudioClock)){
        IAudioClock_AddRef(&This->IAudioClock_iface);
        *ppv = &This->IAudioClock_iface;
    }else if(IsEqualIID(riid, &IID_IAudioStreamVolume)){
        IAudioStreamVolume_AddRef(&This->IAudioStreamVolume_iface);
        *ppv = &This->IAudioStreamVolume_iface;
    }else if(IsEqualIID(riid, &IID_IAudioSessionControl)){
        if(!This->session_wrapper){
            This->session_wrapper = AudioSessionWrapper_Create(This);
            if(!This->session_wrapper){
                OSSpinLockUnlock(&This->lock);
                return E_OUTOFMEMORY;
            }
        }else
            IAudioSessionControl2_AddRef(&This->session_wrapper->IAudioSessionControl2_iface);

        *ppv = &This->session_wrapper->IAudioSessionControl2_iface;
    }else if(IsEqualIID(riid, &IID_IChannelAudioVolume)){
        if(!This->session_wrapper){
            This->session_wrapper = AudioSessionWrapper_Create(This);
            if(!This->session_wrapper){
                OSSpinLockUnlock(&This->lock);
                return E_OUTOFMEMORY;
            }
        }else
            IChannelAudioVolume_AddRef(&This->session_wrapper->IChannelAudioVolume_iface);

        *ppv = &This->session_wrapper->IChannelAudioVolume_iface;
    }else if(IsEqualIID(riid, &IID_ISimpleAudioVolume)){
        if(!This->session_wrapper){
            This->session_wrapper = AudioSessionWrapper_Create(This);
            if(!This->session_wrapper){
                OSSpinLockUnlock(&This->lock);
                return E_OUTOFMEMORY;
            }
        }else
            ISimpleAudioVolume_AddRef(&This->session_wrapper->ISimpleAudioVolume_iface);

        *ppv = &This->session_wrapper->ISimpleAudioVolume_iface;
    }

    if(*ppv){
        OSSpinLockUnlock(&This->lock);
        return S_OK;
    }

    OSSpinLockUnlock(&This->lock);

    FIXME("stub %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static const IAudioClientVtbl AudioClient_Vtbl =
{
    AudioClient_QueryInterface,
    AudioClient_AddRef,
    AudioClient_Release,
    AudioClient_Initialize,
    AudioClient_GetBufferSize,
    AudioClient_GetStreamLatency,
    AudioClient_GetCurrentPadding,
    AudioClient_IsFormatSupported,
    AudioClient_GetMixFormat,
    AudioClient_GetDevicePeriod,
    AudioClient_Start,
    AudioClient_Stop,
    AudioClient_Reset,
    AudioClient_SetEventHandle,
    AudioClient_GetService
};

static HRESULT WINAPI AudioRenderClient_QueryInterface(
        IAudioRenderClient *iface, REFIID riid, void **ppv)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;

    if(IsEqualIID(riid, &IID_IUnknown) ||
            IsEqualIID(riid, &IID_IAudioRenderClient))
        *ppv = iface;
    if(*ppv){
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }

    WARN("Unknown interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI AudioRenderClient_AddRef(IAudioRenderClient *iface)
{
    ACImpl *This = impl_from_IAudioRenderClient(iface);
    return AudioClient_AddRef(&This->IAudioClient_iface);
}

static ULONG WINAPI AudioRenderClient_Release(IAudioRenderClient *iface)
{
    ACImpl *This = impl_from_IAudioRenderClient(iface);
    return AudioClient_Release(&This->IAudioClient_iface);
}

static HRESULT WINAPI AudioRenderClient_GetBuffer(IAudioRenderClient *iface,
        UINT32 frames, BYTE **data)
{
    ACImpl *This = impl_from_IAudioRenderClient(iface);
    AQBuffer *buf;
    UINT32 pad, bytes;
    HRESULT hr;
    OSStatus sc;

    TRACE("(%p)->(%u, %p)\n", This, frames, data);

    if(!data)
        return E_POINTER;
    *data = NULL;

    OSSpinLockLock(&This->lock);

    if(This->getbuf_last){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_OUT_OF_ORDER;
    }

    if(!frames){
        OSSpinLockUnlock(&This->lock);
        return S_OK;
    }

    hr = AudioClient_GetCurrentPadding_nolock(This, &pad);
    if(FAILED(hr)){
        OSSpinLockUnlock(&This->lock);
        return hr;
    }

    if(pad + frames > This->bufsize_frames){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_BUFFER_TOO_LARGE;
    }

    bytes = frames * This->fmt->nBlockAlign;
    LIST_FOR_EACH_ENTRY(buf, &This->avail_buffers, AQBuffer, entry){
        if(buf->buf->mAudioDataBytesCapacity >= bytes){
            This->public_buffer = buf->buf;
            list_remove(&buf->entry);
            break;
        }
    }

    if(&buf->entry == &This->avail_buffers){
        sc = AudioQueueAllocateBuffer(This->aqueue, bytes,
                &This->public_buffer);
        if(sc != noErr){
            This->public_buffer = NULL;
            OSSpinLockUnlock(&This->lock);
            WARN("Unable to allocate buffer: %lx\n", sc);
            return E_OUTOFMEMORY;
        }
        buf = HeapAlloc(GetProcessHeap(), 0, sizeof(AQBuffer));
        if(!buf){
            AudioQueueFreeBuffer(This->aqueue, This->public_buffer);
            This->public_buffer = NULL;
            OSSpinLockUnlock(&This->lock);
            return E_OUTOFMEMORY;
        }
        buf->used = FALSE;
        buf->buf = This->public_buffer;
        This->public_buffer->mUserData = buf;
    }

    This->getbuf_last = frames;
    *data = This->public_buffer->mAudioData;

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static HRESULT WINAPI AudioRenderClient_ReleaseBuffer(
        IAudioRenderClient *iface, UINT32 frames, DWORD flags)
{
    ACImpl *This = impl_from_IAudioRenderClient(iface);
    AQBuffer *buf;
    AudioTimeStamp start_time, req_time = {0}, *passed_time = NULL;
    OSStatus sc;

    TRACE("(%p)->(%u, %x)\n", This, frames, flags);

    OSSpinLockLock(&This->lock);

    if(!frames){
        This->getbuf_last = 0;
        if(This->public_buffer){
            buf = This->public_buffer->mUserData;
            list_add_head(&This->avail_buffers, &buf->entry);
            This->public_buffer = NULL;
        }
        OSSpinLockUnlock(&This->lock);
        return S_OK;
    }

    if(!This->getbuf_last){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_OUT_OF_ORDER;
    }

    if(frames > This->getbuf_last){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_INVALID_SIZE;
    }

    if(flags & AUDCLNT_BUFFERFLAGS_SILENT){
        WAVEFORMATEXTENSIBLE *fmtex = (WAVEFORMATEXTENSIBLE*)This->fmt;
        if((This->fmt->wFormatTag == WAVE_FORMAT_PCM ||
                (This->fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
                 IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))) &&
                This->fmt->wBitsPerSample == 8)
            memset(This->public_buffer->mAudioData, 128,
                    frames * This->fmt->nBlockAlign);
        else
            memset(This->public_buffer->mAudioData, 0,
                    frames * This->fmt->nBlockAlign);
    }

    This->public_buffer->mAudioDataByteSize = frames * This->fmt->nBlockAlign;

    buf = This->public_buffer->mUserData;
    buf->used = TRUE;

    if(list_empty(&This->queued_bufinfos)){
        sc = AudioQueueGetCurrentTime(This->aqueue, NULL, &req_time, NULL);
        if(sc == noErr)
            passed_time = &req_time;
        else
            TRACE("AudioQueueGetCurrentTime failed: %lx\n", sc);
    }else{
        req_time.mSampleTime = This->next_sampletime;
        req_time.mFlags = kAudioTimeStampSampleTimeValid;
        passed_time = &req_time;
    }

    sc = AudioQueueEnqueueBufferWithParameters(This->aqueue,
            This->public_buffer, 0, NULL, 0, 0, 0, NULL, passed_time,
            &start_time);
    if(sc != noErr){
        OSSpinLockUnlock(&This->lock);
        ERR("Unable to enqueue buffer: %lx\n", sc);
        return AUDCLNT_E_DEVICE_INVALIDATED;
    }
    list_add_tail(&This->queued_buffers, &buf->entry);

    if(start_time.mFlags & kAudioTimeStampSampleTimeValid){
        QueuedBufInfo *bufinfo;

        bufinfo = HeapAlloc(GetProcessHeap(), 0, sizeof(*bufinfo));
        bufinfo->start_sampletime = start_time.mSampleTime;
        bufinfo->start_pos = This->written_frames;
        bufinfo->len_frames = frames;

        list_add_tail(&This->queued_bufinfos, &bufinfo->entry);

        This->next_sampletime = start_time.mSampleTime + bufinfo->len_frames;
    }else
        WARN("Start time didn't contain valid SampleTime member\n");

    if(This->playing == StateStopped)
        AudioQueuePrime(This->aqueue, 0, NULL);

    This->public_buffer = NULL;
    This->getbuf_last = 0;
    This->written_frames += frames;
    This->inbuf_frames += frames;

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static const IAudioRenderClientVtbl AudioRenderClient_Vtbl = {
    AudioRenderClient_QueryInterface,
    AudioRenderClient_AddRef,
    AudioRenderClient_Release,
    AudioRenderClient_GetBuffer,
    AudioRenderClient_ReleaseBuffer
};

static HRESULT WINAPI AudioCaptureClient_QueryInterface(
        IAudioCaptureClient *iface, REFIID riid, void **ppv)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;

    if(IsEqualIID(riid, &IID_IUnknown) ||
            IsEqualIID(riid, &IID_IAudioCaptureClient))
        *ppv = iface;
    if(*ppv){
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }

    WARN("Unknown interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI AudioCaptureClient_AddRef(IAudioCaptureClient *iface)
{
    ACImpl *This = impl_from_IAudioCaptureClient(iface);
    return IAudioClient_AddRef(&This->IAudioClient_iface);
}

static ULONG WINAPI AudioCaptureClient_Release(IAudioCaptureClient *iface)
{
    ACImpl *This = impl_from_IAudioCaptureClient(iface);
    return IAudioClient_Release(&This->IAudioClient_iface);
}

static HRESULT AudioCaptureClient_GetNextPacket(ACImpl *This, UINT32 *frames)
{
    AQBuffer *buf;
    OSStatus sc;

    avail_update(This); /* once, not inside loop */

    for(;;){
        if(!This->public_buffer){
            struct list *head = list_head(&This->avail_buffers);

            if(!head){
                *frames = 0;
                return S_OK;
            }
            buf = LIST_ENTRY(head, AQBuffer, entry);
            This->public_buffer = buf->buf;
            list_remove(&buf->entry);
        }else
            buf = This->public_buffer->mUserData;
        *frames = This->public_buffer->mAudioDataByteSize / This->fmt->nBlockAlign;
        if(*frames)
            return S_OK;

        WARN("empty packet\n");
        buf->used = TRUE;
        sc = AudioQueueEnqueueBuffer(This->aqueue, This->public_buffer, 0, NULL);
        if(sc != noErr){
            ERR("Unable to enqueue buffer: %lx\n", sc);
            /* Release will free This->public_buffer */
            return AUDCLNT_E_DEVICE_INVALIDATED;
        }else
            list_add_tail(&This->queued_buffers, &buf->entry);
        This->public_buffer = NULL;
    }
}

static HRESULT WINAPI AudioCaptureClient_GetBuffer(IAudioCaptureClient *iface,
        BYTE **data, UINT32 *frames, DWORD *flags, UINT64 *devpos,
        UINT64 *qpcpos)
{
    ACImpl *This = impl_from_IAudioCaptureClient(iface);
    HRESULT hr;

    TRACE("(%p)->(%p, %p, %p, %p, %p)\n", This, data, frames, flags,
            devpos, qpcpos);

    if(!data || !frames || !flags)
        return E_POINTER;

    OSSpinLockLock(&This->lock);

    if(This->getbuf_last){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_OUT_OF_ORDER;
    }

    hr = AudioCaptureClient_GetNextPacket(This, frames);
    if(FAILED(hr)){
        OSSpinLockUnlock(&This->lock);
        return hr;
    }

    if((This->getbuf_last = *frames)){
        *flags = 0;
        *data = This->public_buffer->mAudioData;

        if(devpos)
            *devpos = This->written_frames;
        if(qpcpos){ /* fixme: qpc of recording time */
            LARGE_INTEGER stamp, freq;
            QueryPerformanceCounter(&stamp);
            QueryPerformanceFrequency(&freq);
            *qpcpos = (stamp.QuadPart * (INT64)10000000) / freq.QuadPart;
        }
    }
    OSSpinLockUnlock(&This->lock);

    return *frames ? S_OK : AUDCLNT_S_BUFFER_EMPTY;
}

static HRESULT WINAPI AudioCaptureClient_ReleaseBuffer(
        IAudioCaptureClient *iface, UINT32 done)
{
    ACImpl *This = impl_from_IAudioCaptureClient(iface);
    AQBuffer *buf;
    OSStatus sc;

    TRACE("(%p)->(%u)\n", This, done);

    OSSpinLockLock(&This->lock);

    if(!done){
        This->getbuf_last = 0;
        OSSpinLockUnlock(&This->lock);
        return S_OK;
    }

    if(!This->getbuf_last){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_OUT_OF_ORDER;
    }

    if(This->getbuf_last != done){
        OSSpinLockUnlock(&This->lock);
        return AUDCLNT_E_INVALID_SIZE;
    }

    This->written_frames += done;
    This->inbuf_frames -= done;
    This->getbuf_last = 0;

    buf = This->public_buffer->mUserData;
    buf->used = TRUE;
    sc = AudioQueueEnqueueBuffer(This->aqueue, This->public_buffer, 0, NULL);
    if(sc != noErr){
        OSSpinLockUnlock(&This->lock);
        /* fixme: can't zero public_buffer or we lose memory, but then
         * GetBuffer will see that packet again and again. */
        ERR("Unable to enqueue buffer: %lx\n", sc);
        return AUDCLNT_E_DEVICE_INVALIDATED;
    }else
        list_add_tail(&This->queued_buffers, &buf->entry);
    This->public_buffer = NULL;

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static HRESULT WINAPI AudioCaptureClient_GetNextPacketSize(
        IAudioCaptureClient *iface, UINT32 *frames)
{
    ACImpl *This = impl_from_IAudioCaptureClient(iface);
    HRESULT hr;

    TRACE("(%p)->(%p)\n", This, frames);

    if(!frames)
        return E_POINTER;

    OSSpinLockLock(&This->lock);

    hr = AudioCaptureClient_GetNextPacket(This, frames);

    OSSpinLockUnlock(&This->lock);

    return hr;
}

static const IAudioCaptureClientVtbl AudioCaptureClient_Vtbl =
{
    AudioCaptureClient_QueryInterface,
    AudioCaptureClient_AddRef,
    AudioCaptureClient_Release,
    AudioCaptureClient_GetBuffer,
    AudioCaptureClient_ReleaseBuffer,
    AudioCaptureClient_GetNextPacketSize
};

static HRESULT WINAPI AudioClock_QueryInterface(IAudioClock *iface,
        REFIID riid, void **ppv)
{
    ACImpl *This = impl_from_IAudioClock(iface);

    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;

    if(IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_IAudioClock))
        *ppv = iface;
    else if(IsEqualIID(riid, &IID_IAudioClock2))
        *ppv = &This->IAudioClock2_iface;
    if(*ppv){
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }

    WARN("Unknown interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI AudioClock_AddRef(IAudioClock *iface)
{
    ACImpl *This = impl_from_IAudioClock(iface);
    return IAudioClient_AddRef(&This->IAudioClient_iface);
}

static ULONG WINAPI AudioClock_Release(IAudioClock *iface)
{
    ACImpl *This = impl_from_IAudioClock(iface);
    return IAudioClient_Release(&This->IAudioClient_iface);
}

static HRESULT WINAPI AudioClock_GetFrequency(IAudioClock *iface, UINT64 *freq)
{
    ACImpl *This = impl_from_IAudioClock(iface);

    TRACE("(%p)->(%p)\n", This, freq);

    *freq = This->fmt->nSamplesPerSec;

    return S_OK;
}

static HRESULT AudioClock_GetPosition_nolock(ACImpl *This,
        UINT64 *pos, UINT64 *qpctime)
{
    avail_update(This);

    if(This->dataflow == eRender)
        *pos = get_current_aqbuffer_position(This, BUFPOS_ABSOLUTE);
    else
        *pos = This->inbuf_frames + This->written_frames;

    if(qpctime){
        LARGE_INTEGER stamp, freq;
        QueryPerformanceCounter(&stamp);
        QueryPerformanceFrequency(&freq);
        *qpctime = (stamp.QuadPart * (INT64)10000000) / freq.QuadPart;
    }

    return S_OK;
}

static HRESULT WINAPI AudioClock_GetPosition(IAudioClock *iface, UINT64 *pos,
        UINT64 *qpctime)
{
    ACImpl *This = impl_from_IAudioClock(iface);
    HRESULT hr;

    TRACE("(%p)->(%p, %p)\n", This, pos, qpctime);

    if(!pos)
        return E_POINTER;

    OSSpinLockLock(&This->lock);

    hr = AudioClock_GetPosition_nolock(This, pos, qpctime);

    OSSpinLockUnlock(&This->lock);

    return hr;
}

static HRESULT WINAPI AudioClock_GetCharacteristics(IAudioClock *iface,
        DWORD *chars)
{
    ACImpl *This = impl_from_IAudioClock(iface);

    TRACE("(%p)->(%p)\n", This, chars);

    if(!chars)
        return E_POINTER;

    *chars = AUDIOCLOCK_CHARACTERISTIC_FIXED_FREQ;

    return S_OK;
}

static const IAudioClockVtbl AudioClock_Vtbl =
{
    AudioClock_QueryInterface,
    AudioClock_AddRef,
    AudioClock_Release,
    AudioClock_GetFrequency,
    AudioClock_GetPosition,
    AudioClock_GetCharacteristics
};

static HRESULT WINAPI AudioClock2_QueryInterface(IAudioClock2 *iface,
        REFIID riid, void **ppv)
{
    ACImpl *This = impl_from_IAudioClock2(iface);
    return IAudioClock_QueryInterface(&This->IAudioClock_iface, riid, ppv);
}

static ULONG WINAPI AudioClock2_AddRef(IAudioClock2 *iface)
{
    ACImpl *This = impl_from_IAudioClock2(iface);
    return IAudioClient_AddRef(&This->IAudioClient_iface);
}

static ULONG WINAPI AudioClock2_Release(IAudioClock2 *iface)
{
    ACImpl *This = impl_from_IAudioClock2(iface);
    return IAudioClient_Release(&This->IAudioClient_iface);
}

static HRESULT WINAPI AudioClock2_GetDevicePosition(IAudioClock2 *iface,
        UINT64 *pos, UINT64 *qpctime)
{
    ACImpl *This = impl_from_IAudioClock2(iface);

    FIXME("(%p)->(%p, %p)\n", This, pos, qpctime);

    return E_NOTIMPL;
}

static const IAudioClock2Vtbl AudioClock2_Vtbl =
{
    AudioClock2_QueryInterface,
    AudioClock2_AddRef,
    AudioClock2_Release,
    AudioClock2_GetDevicePosition
};

static AudioSessionWrapper *AudioSessionWrapper_Create(ACImpl *client)
{
    AudioSessionWrapper *ret;

    ret = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
            sizeof(AudioSessionWrapper));
    if(!ret)
        return NULL;

    ret->IAudioSessionControl2_iface.lpVtbl = &AudioSessionControl2_Vtbl;
    ret->ISimpleAudioVolume_iface.lpVtbl = &SimpleAudioVolume_Vtbl;
    ret->IChannelAudioVolume_iface.lpVtbl = &ChannelAudioVolume_Vtbl;

    ret->ref = 1;

    ret->client = client;
    if(client){
        ret->session = client->session;
        AudioClient_AddRef(&client->IAudioClient_iface);
    }

    return ret;
}

static HRESULT WINAPI AudioSessionControl_QueryInterface(
        IAudioSessionControl2 *iface, REFIID riid, void **ppv)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;

    if(IsEqualIID(riid, &IID_IUnknown) ||
            IsEqualIID(riid, &IID_IAudioSessionControl) ||
            IsEqualIID(riid, &IID_IAudioSessionControl2))
        *ppv = iface;
    if(*ppv){
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }

    WARN("Unknown interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI AudioSessionControl_AddRef(IAudioSessionControl2 *iface)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);
    ULONG ref;
    ref = InterlockedIncrement(&This->ref);
    TRACE("(%p) Refcount now %u\n", This, ref);
    return ref;
}

static ULONG WINAPI AudioSessionControl_Release(IAudioSessionControl2 *iface)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);
    ULONG ref;
    ref = InterlockedDecrement(&This->ref);
    TRACE("(%p) Refcount now %u\n", This, ref);
    if(!ref){
        if(This->client){
            OSSpinLockLock(&This->client->lock);
            This->client->session_wrapper = NULL;
            OSSpinLockUnlock(&This->client->lock);
            AudioClient_Release(&This->client->IAudioClient_iface);
        }
        HeapFree(GetProcessHeap(), 0, This);
    }
    return ref;
}

static HRESULT WINAPI AudioSessionControl_GetState(IAudioSessionControl2 *iface,
        AudioSessionState *state)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);
    ACImpl *client;

    TRACE("(%p)->(%p)\n", This, state);

    if(!state)
        return NULL_PTR_ERR;

    EnterCriticalSection(&g_sessions_lock);

    if(list_empty(&This->session->clients)){
        *state = AudioSessionStateExpired;
        LeaveCriticalSection(&g_sessions_lock);
        return S_OK;
    }

    LIST_FOR_EACH_ENTRY(client, &This->session->clients, ACImpl, entry){
        OSSpinLockLock(&client->lock);
        if(client->playing == StatePlaying ||
                client->playing == StateInTransition){
            *state = AudioSessionStateActive;
            OSSpinLockUnlock(&client->lock);
            LeaveCriticalSection(&g_sessions_lock);
            return S_OK;
        }
        OSSpinLockUnlock(&client->lock);
    }

    LeaveCriticalSection(&g_sessions_lock);

    *state = AudioSessionStateInactive;

    return S_OK;
}

static HRESULT WINAPI AudioSessionControl_GetDisplayName(
        IAudioSessionControl2 *iface, WCHAR **name)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%p) - stub\n", This, name);

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionControl_SetDisplayName(
        IAudioSessionControl2 *iface, const WCHAR *name, const GUID *session)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%p, %s) - stub\n", This, name, debugstr_guid(session));

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionControl_GetIconPath(
        IAudioSessionControl2 *iface, WCHAR **path)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%p) - stub\n", This, path);

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionControl_SetIconPath(
        IAudioSessionControl2 *iface, const WCHAR *path, const GUID *session)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%p, %s) - stub\n", This, path, debugstr_guid(session));

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionControl_GetGroupingParam(
        IAudioSessionControl2 *iface, GUID *group)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%p) - stub\n", This, group);

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionControl_SetGroupingParam(
        IAudioSessionControl2 *iface, const GUID *group, const GUID *session)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%s, %s) - stub\n", This, debugstr_guid(group),
            debugstr_guid(session));

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionControl_RegisterAudioSessionNotification(
        IAudioSessionControl2 *iface, IAudioSessionEvents *events)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%p) - stub\n", This, events);

    return S_OK;
}

static HRESULT WINAPI AudioSessionControl_UnregisterAudioSessionNotification(
        IAudioSessionControl2 *iface, IAudioSessionEvents *events)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%p) - stub\n", This, events);

    return S_OK;
}

static HRESULT WINAPI AudioSessionControl_GetSessionIdentifier(
        IAudioSessionControl2 *iface, WCHAR **id)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%p) - stub\n", This, id);

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionControl_GetSessionInstanceIdentifier(
        IAudioSessionControl2 *iface, WCHAR **id)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    FIXME("(%p)->(%p) - stub\n", This, id);

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionControl_GetProcessId(
        IAudioSessionControl2 *iface, DWORD *pid)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    TRACE("(%p)->(%p)\n", This, pid);

    if(!pid)
        return E_POINTER;

    *pid = GetCurrentProcessId();

    return S_OK;
}

static HRESULT WINAPI AudioSessionControl_IsSystemSoundsSession(
        IAudioSessionControl2 *iface)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    TRACE("(%p)\n", This);

    return S_FALSE;
}

static HRESULT WINAPI AudioSessionControl_SetDuckingPreference(
        IAudioSessionControl2 *iface, BOOL optout)
{
    AudioSessionWrapper *This = impl_from_IAudioSessionControl2(iface);

    TRACE("(%p)->(%d)\n", This, optout);

    return S_OK;
}

static const IAudioSessionControl2Vtbl AudioSessionControl2_Vtbl =
{
    AudioSessionControl_QueryInterface,
    AudioSessionControl_AddRef,
    AudioSessionControl_Release,
    AudioSessionControl_GetState,
    AudioSessionControl_GetDisplayName,
    AudioSessionControl_SetDisplayName,
    AudioSessionControl_GetIconPath,
    AudioSessionControl_SetIconPath,
    AudioSessionControl_GetGroupingParam,
    AudioSessionControl_SetGroupingParam,
    AudioSessionControl_RegisterAudioSessionNotification,
    AudioSessionControl_UnregisterAudioSessionNotification,
    AudioSessionControl_GetSessionIdentifier,
    AudioSessionControl_GetSessionInstanceIdentifier,
    AudioSessionControl_GetProcessId,
    AudioSessionControl_IsSystemSoundsSession,
    AudioSessionControl_SetDuckingPreference
};

/* index == -1 means set all channels, otherwise sets only the given channel */
static HRESULT ca_setvol(ACImpl *This, UINT32 index)
{
    float level;
    OSStatus sc;

    if(index == (UINT32)-1){
        HRESULT ret = S_OK;
        UINT32 i;
        for(i = 0; i < This->fmt->nChannels; ++i){
            HRESULT hr;
            hr = ca_setvol(This, i);
            if(FAILED(hr))
                ret = hr;
        }
        return ret;
    }

    if(This->session->mute)
        level = 0;
    else
        level = This->session->master_vol *
            This->session->channel_vols[index] * This->vols[index];

    sc = AudioQueueSetParameter(This->aqueue, kAudioQueueParam_Volume, level);
    if(sc != noErr)
        WARN("Setting _Volume property failed: %lx\n", sc);

    return S_OK;
}

static HRESULT ca_session_setvol(AudioSession *session, UINT32 index)
{
    HRESULT ret = S_OK;
    ACImpl *client;

    LIST_FOR_EACH_ENTRY(client, &session->clients, ACImpl, entry){
        HRESULT hr;
        hr = ca_setvol(client, index);
        if(FAILED(hr))
            ret = hr;
    }

    return ret;
}

static HRESULT WINAPI SimpleAudioVolume_QueryInterface(
        ISimpleAudioVolume *iface, REFIID riid, void **ppv)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;

    if(IsEqualIID(riid, &IID_IUnknown) ||
            IsEqualIID(riid, &IID_ISimpleAudioVolume))
        *ppv = iface;
    if(*ppv){
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }

    WARN("Unknown interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI SimpleAudioVolume_AddRef(ISimpleAudioVolume *iface)
{
    AudioSessionWrapper *This = impl_from_ISimpleAudioVolume(iface);
    return AudioSessionControl_AddRef(&This->IAudioSessionControl2_iface);
}

static ULONG WINAPI SimpleAudioVolume_Release(ISimpleAudioVolume *iface)
{
    AudioSessionWrapper *This = impl_from_ISimpleAudioVolume(iface);
    return AudioSessionControl_Release(&This->IAudioSessionControl2_iface);
}

static HRESULT WINAPI SimpleAudioVolume_SetMasterVolume(
        ISimpleAudioVolume *iface, float level, const GUID *context)
{
    AudioSessionWrapper *This = impl_from_ISimpleAudioVolume(iface);
    AudioSession *session = This->session;
    HRESULT ret;

    TRACE("(%p)->(%f, %s)\n", session, level, wine_dbgstr_guid(context));

    if(level < 0.f || level > 1.f)
        return E_INVALIDARG;

    if(context)
        FIXME("Notifications not supported yet\n");

    EnterCriticalSection(&session->lock);

    session->master_vol = level;

    ret = ca_session_setvol(session, -1);

    LeaveCriticalSection(&session->lock);

    return ret;
}

static HRESULT WINAPI SimpleAudioVolume_GetMasterVolume(
        ISimpleAudioVolume *iface, float *level)
{
    AudioSessionWrapper *This = impl_from_ISimpleAudioVolume(iface);
    AudioSession *session = This->session;

    TRACE("(%p)->(%p)\n", session, level);

    if(!level)
        return NULL_PTR_ERR;

    *level = session->master_vol;

    return S_OK;
}

static HRESULT WINAPI SimpleAudioVolume_SetMute(ISimpleAudioVolume *iface,
        BOOL mute, const GUID *context)
{
    AudioSessionWrapper *This = impl_from_ISimpleAudioVolume(iface);
    AudioSession *session = This->session;

    TRACE("(%p)->(%u, %p)\n", session, mute, context);

    if(context)
        FIXME("Notifications not supported yet\n");

    EnterCriticalSection(&session->lock);

    session->mute = mute;

    ca_session_setvol(session, -1);

    LeaveCriticalSection(&session->lock);

    return S_OK;
}

static HRESULT WINAPI SimpleAudioVolume_GetMute(ISimpleAudioVolume *iface,
        BOOL *mute)
{
    AudioSessionWrapper *This = impl_from_ISimpleAudioVolume(iface);
    AudioSession *session = This->session;

    TRACE("(%p)->(%p)\n", session, mute);

    if(!mute)
        return NULL_PTR_ERR;

    *mute = session->mute;

    return S_OK;
}

static const ISimpleAudioVolumeVtbl SimpleAudioVolume_Vtbl  =
{
    SimpleAudioVolume_QueryInterface,
    SimpleAudioVolume_AddRef,
    SimpleAudioVolume_Release,
    SimpleAudioVolume_SetMasterVolume,
    SimpleAudioVolume_GetMasterVolume,
    SimpleAudioVolume_SetMute,
    SimpleAudioVolume_GetMute
};

static HRESULT WINAPI AudioStreamVolume_QueryInterface(
        IAudioStreamVolume *iface, REFIID riid, void **ppv)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;

    if(IsEqualIID(riid, &IID_IUnknown) ||
            IsEqualIID(riid, &IID_IAudioStreamVolume))
        *ppv = iface;
    if(*ppv){
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }

    WARN("Unknown interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI AudioStreamVolume_AddRef(IAudioStreamVolume *iface)
{
    ACImpl *This = impl_from_IAudioStreamVolume(iface);
    return IAudioClient_AddRef(&This->IAudioClient_iface);
}

static ULONG WINAPI AudioStreamVolume_Release(IAudioStreamVolume *iface)
{
    ACImpl *This = impl_from_IAudioStreamVolume(iface);
    return IAudioClient_Release(&This->IAudioClient_iface);
}

static HRESULT WINAPI AudioStreamVolume_GetChannelCount(
        IAudioStreamVolume *iface, UINT32 *out)
{
    ACImpl *This = impl_from_IAudioStreamVolume(iface);

    TRACE("(%p)->(%p)\n", This, out);

    if(!out)
        return E_POINTER;

    *out = This->fmt->nChannels;

    return S_OK;
}

static HRESULT WINAPI AudioStreamVolume_SetChannelVolume(
        IAudioStreamVolume *iface, UINT32 index, float level)
{
    ACImpl *This = impl_from_IAudioStreamVolume(iface);
    HRESULT ret;

    TRACE("(%p)->(%d, %f)\n", This, index, level);

    if(level < 0.f || level > 1.f)
        return E_INVALIDARG;

    if(index >= This->fmt->nChannels)
        return E_INVALIDARG;

    OSSpinLockLock(&This->lock);

    This->vols[index] = level;

    WARN("AudioQueue doesn't support per-channel volume control\n");
    ret = ca_setvol(This, index);

    OSSpinLockUnlock(&This->lock);

    return ret;
}

static HRESULT WINAPI AudioStreamVolume_GetChannelVolume(
        IAudioStreamVolume *iface, UINT32 index, float *level)
{
    ACImpl *This = impl_from_IAudioStreamVolume(iface);

    TRACE("(%p)->(%d, %p)\n", This, index, level);

    if(!level)
        return E_POINTER;

    if(index >= This->fmt->nChannels)
        return E_INVALIDARG;

    *level = This->vols[index];

    return S_OK;
}

static HRESULT WINAPI AudioStreamVolume_SetAllVolumes(
        IAudioStreamVolume *iface, UINT32 count, const float *levels)
{
    ACImpl *This = impl_from_IAudioStreamVolume(iface);
    int i;
    HRESULT ret;

    TRACE("(%p)->(%d, %p)\n", This, count, levels);

    if(!levels)
        return E_POINTER;

    if(count != This->fmt->nChannels)
        return E_INVALIDARG;

    OSSpinLockLock(&This->lock);

    for(i = 0; i < count; ++i)
        This->vols[i] = levels[i];

    ret = ca_setvol(This, -1);

    OSSpinLockUnlock(&This->lock);

    return ret;
}

static HRESULT WINAPI AudioStreamVolume_GetAllVolumes(
        IAudioStreamVolume *iface, UINT32 count, float *levels)
{
    ACImpl *This = impl_from_IAudioStreamVolume(iface);
    int i;

    TRACE("(%p)->(%d, %p)\n", This, count, levels);

    if(!levels)
        return E_POINTER;

    if(count != This->fmt->nChannels)
        return E_INVALIDARG;

    OSSpinLockLock(&This->lock);

    for(i = 0; i < count; ++i)
        levels[i] = This->vols[i];

    OSSpinLockUnlock(&This->lock);

    return S_OK;
}

static const IAudioStreamVolumeVtbl AudioStreamVolume_Vtbl =
{
    AudioStreamVolume_QueryInterface,
    AudioStreamVolume_AddRef,
    AudioStreamVolume_Release,
    AudioStreamVolume_GetChannelCount,
    AudioStreamVolume_SetChannelVolume,
    AudioStreamVolume_GetChannelVolume,
    AudioStreamVolume_SetAllVolumes,
    AudioStreamVolume_GetAllVolumes
};

static HRESULT WINAPI ChannelAudioVolume_QueryInterface(
        IChannelAudioVolume *iface, REFIID riid, void **ppv)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;

    if(IsEqualIID(riid, &IID_IUnknown) ||
            IsEqualIID(riid, &IID_IChannelAudioVolume))
        *ppv = iface;
    if(*ppv){
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }

    WARN("Unknown interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI ChannelAudioVolume_AddRef(IChannelAudioVolume *iface)
{
    AudioSessionWrapper *This = impl_from_IChannelAudioVolume(iface);
    return AudioSessionControl_AddRef(&This->IAudioSessionControl2_iface);
}

static ULONG WINAPI ChannelAudioVolume_Release(IChannelAudioVolume *iface)
{
    AudioSessionWrapper *This = impl_from_IChannelAudioVolume(iface);
    return AudioSessionControl_Release(&This->IAudioSessionControl2_iface);
}

static HRESULT WINAPI ChannelAudioVolume_GetChannelCount(
        IChannelAudioVolume *iface, UINT32 *out)
{
    AudioSessionWrapper *This = impl_from_IChannelAudioVolume(iface);
    AudioSession *session = This->session;

    TRACE("(%p)->(%p)\n", session, out);

    if(!out)
        return NULL_PTR_ERR;

    *out = session->channel_count;

    return S_OK;
}

static HRESULT WINAPI ChannelAudioVolume_SetChannelVolume(
        IChannelAudioVolume *iface, UINT32 index, float level,
        const GUID *context)
{
    AudioSessionWrapper *This = impl_from_IChannelAudioVolume(iface);
    AudioSession *session = This->session;
    HRESULT ret;

    TRACE("(%p)->(%d, %f, %s)\n", session, index, level,
            wine_dbgstr_guid(context));

    if(level < 0.f || level > 1.f)
        return E_INVALIDARG;

    if(index >= session->channel_count)
        return E_INVALIDARG;

    if(context)
        FIXME("Notifications not supported yet\n");

    EnterCriticalSection(&session->lock);

    session->channel_vols[index] = level;

    WARN("AudioQueue doesn't support per-channel volume control\n");
    ret = ca_session_setvol(session, index);

    LeaveCriticalSection(&session->lock);

    return ret;
}

static HRESULT WINAPI ChannelAudioVolume_GetChannelVolume(
        IChannelAudioVolume *iface, UINT32 index, float *level)
{
    AudioSessionWrapper *This = impl_from_IChannelAudioVolume(iface);
    AudioSession *session = This->session;

    TRACE("(%p)->(%d, %p)\n", session, index, level);

    if(!level)
        return NULL_PTR_ERR;

    if(index >= session->channel_count)
        return E_INVALIDARG;

    *level = session->channel_vols[index];

    return S_OK;
}

static HRESULT WINAPI ChannelAudioVolume_SetAllVolumes(
        IChannelAudioVolume *iface, UINT32 count, const float *levels,
        const GUID *context)
{
    AudioSessionWrapper *This = impl_from_IChannelAudioVolume(iface);
    AudioSession *session = This->session;
    int i;
    HRESULT ret;

    TRACE("(%p)->(%d, %p, %s)\n", session, count, levels,
            wine_dbgstr_guid(context));

    if(!levels)
        return NULL_PTR_ERR;

    if(count != session->channel_count)
        return E_INVALIDARG;

    if(context)
        FIXME("Notifications not supported yet\n");

    EnterCriticalSection(&session->lock);

    for(i = 0; i < count; ++i)
        session->channel_vols[i] = levels[i];

    ret = ca_session_setvol(session, -1);

    LeaveCriticalSection(&session->lock);

    return ret;
}

static HRESULT WINAPI ChannelAudioVolume_GetAllVolumes(
        IChannelAudioVolume *iface, UINT32 count, float *levels)
{
    AudioSessionWrapper *This = impl_from_IChannelAudioVolume(iface);
    AudioSession *session = This->session;
    int i;

    TRACE("(%p)->(%d, %p)\n", session, count, levels);

    if(!levels)
        return NULL_PTR_ERR;

    if(count != session->channel_count)
        return E_INVALIDARG;

    for(i = 0; i < count; ++i)
        levels[i] = session->channel_vols[i];

    return S_OK;
}

static const IChannelAudioVolumeVtbl ChannelAudioVolume_Vtbl =
{
    ChannelAudioVolume_QueryInterface,
    ChannelAudioVolume_AddRef,
    ChannelAudioVolume_Release,
    ChannelAudioVolume_GetChannelCount,
    ChannelAudioVolume_SetChannelVolume,
    ChannelAudioVolume_GetChannelVolume,
    ChannelAudioVolume_SetAllVolumes,
    ChannelAudioVolume_GetAllVolumes
};

static HRESULT WINAPI AudioSessionManager_QueryInterface(IAudioSessionManager2 *iface,
        REFIID riid, void **ppv)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(riid), ppv);

    if(!ppv)
        return E_POINTER;
    *ppv = NULL;

    if(IsEqualIID(riid, &IID_IUnknown) ||
            IsEqualIID(riid, &IID_IAudioSessionManager) ||
            IsEqualIID(riid, &IID_IAudioSessionManager2))
        *ppv = iface;
    if(*ppv){
        IUnknown_AddRef((IUnknown*)*ppv);
        return S_OK;
    }

    WARN("Unknown interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI AudioSessionManager_AddRef(IAudioSessionManager2 *iface)
{
    SessionMgr *This = impl_from_IAudioSessionManager2(iface);
    ULONG ref;
    ref = InterlockedIncrement(&This->ref);
    TRACE("(%p) Refcount now %u\n", This, ref);
    return ref;
}

static ULONG WINAPI AudioSessionManager_Release(IAudioSessionManager2 *iface)
{
    SessionMgr *This = impl_from_IAudioSessionManager2(iface);
    ULONG ref;
    ref = InterlockedDecrement(&This->ref);
    TRACE("(%p) Refcount now %u\n", This, ref);
    if(!ref)
        HeapFree(GetProcessHeap(), 0, This);
    return ref;
}

static HRESULT WINAPI AudioSessionManager_GetAudioSessionControl(
        IAudioSessionManager2 *iface, const GUID *session_guid, DWORD flags,
        IAudioSessionControl **out)
{
    SessionMgr *This = impl_from_IAudioSessionManager2(iface);
    AudioSession *session;
    AudioSessionWrapper *wrapper;
    HRESULT hr;

    TRACE("(%p)->(%s, %x, %p)\n", This, debugstr_guid(session_guid),
            flags, out);

    hr = get_audio_session(session_guid, This->device, 0, &session);
    if(FAILED(hr))
        return hr;

    wrapper = AudioSessionWrapper_Create(NULL);
    if(!wrapper)
        return E_OUTOFMEMORY;

    wrapper->session = session;

    *out = (IAudioSessionControl*)&wrapper->IAudioSessionControl2_iface;

    return S_OK;
}

static HRESULT WINAPI AudioSessionManager_GetSimpleAudioVolume(
        IAudioSessionManager2 *iface, const GUID *session_guid, DWORD flags,
        ISimpleAudioVolume **out)
{
    SessionMgr *This = impl_from_IAudioSessionManager2(iface);
    AudioSession *session;
    AudioSessionWrapper *wrapper;
    HRESULT hr;

    TRACE("(%p)->(%s, %x, %p)\n", This, debugstr_guid(session_guid),
            flags, out);

    hr = get_audio_session(session_guid, This->device, 0, &session);
    if(FAILED(hr))
        return hr;

    wrapper = AudioSessionWrapper_Create(NULL);
    if(!wrapper)
        return E_OUTOFMEMORY;

    wrapper->session = session;

    *out = &wrapper->ISimpleAudioVolume_iface;

    return S_OK;
}

static HRESULT WINAPI AudioSessionManager_GetSessionEnumerator(
        IAudioSessionManager2 *iface, IAudioSessionEnumerator **out)
{
    SessionMgr *This = impl_from_IAudioSessionManager2(iface);
    FIXME("(%p)->(%p) - stub\n", This, out);
    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionManager_RegisterSessionNotification(
        IAudioSessionManager2 *iface, IAudioSessionNotification *notification)
{
    SessionMgr *This = impl_from_IAudioSessionManager2(iface);
    FIXME("(%p)->(%p) - stub\n", This, notification);
    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionManager_UnregisterSessionNotification(
        IAudioSessionManager2 *iface, IAudioSessionNotification *notification)
{
    SessionMgr *This = impl_from_IAudioSessionManager2(iface);
    FIXME("(%p)->(%p) - stub\n", This, notification);
    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionManager_RegisterDuckNotification(
        IAudioSessionManager2 *iface, const WCHAR *session_id,
        IAudioVolumeDuckNotification *notification)
{
    SessionMgr *This = impl_from_IAudioSessionManager2(iface);
    FIXME("(%p)->(%p) - stub\n", This, notification);
    return E_NOTIMPL;
}

static HRESULT WINAPI AudioSessionManager_UnregisterDuckNotification(
        IAudioSessionManager2 *iface,
        IAudioVolumeDuckNotification *notification)
{
    SessionMgr *This = impl_from_IAudioSessionManager2(iface);
    FIXME("(%p)->(%p) - stub\n", This, notification);
    return E_NOTIMPL;
}

static const IAudioSessionManager2Vtbl AudioSessionManager2_Vtbl =
{
    AudioSessionManager_QueryInterface,
    AudioSessionManager_AddRef,
    AudioSessionManager_Release,
    AudioSessionManager_GetAudioSessionControl,
    AudioSessionManager_GetSimpleAudioVolume,
    AudioSessionManager_GetSessionEnumerator,
    AudioSessionManager_RegisterSessionNotification,
    AudioSessionManager_UnregisterSessionNotification,
    AudioSessionManager_RegisterDuckNotification,
    AudioSessionManager_UnregisterDuckNotification
};

HRESULT WINAPI AUDDRV_GetAudioSessionManager(IMMDevice *device,
        IAudioSessionManager2 **out)
{
    SessionMgr *This;

    This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(SessionMgr));
    if(!This)
        return E_OUTOFMEMORY;

    This->IAudioSessionManager2_iface.lpVtbl = &AudioSessionManager2_Vtbl;
    This->device = device;
    This->ref = 1;

    *out = &This->IAudioSessionManager2_iface;

    return S_OK;
}