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

/*
 * Copyright 2011 Andrew Eikum for CodeWeavers
 *           2022 Huw Davies
 *
 * 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 COBJMACROS
#include "config.h"

#include <stdarg.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 <math.h>
#include <sys/soundcard.h>
#include <pthread.h>

#include "windef.h"
#include "winbase.h"
#include "winternl.h"
#include "winnls.h"
#include "winreg.h"

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

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

#include "wine/debug.h"
#include "wine/list.h"
#include "wine/unicode.h"
#include "wine/unixlib.h"

#include "unixlib.h"

WINE_DEFAULT_DEBUG_CHANNEL(oss);

#define NULL_PTR_ERR MAKE_HRESULT(SEVERITY_ERROR, FACILITY_WIN32, RPC_X_NULL_REF_POINTER)

unixlib_handle_t oss_handle = 0;

static const REFERENCE_TIME DefaultPeriod = 100000;
static const REFERENCE_TIME MinimumPeriod = 50000;

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;

    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 {
    IAudioClient3 IAudioClient3_iface;
    IAudioRenderClient IAudioRenderClient_iface;
    IAudioCaptureClient IAudioCaptureClient_iface;
    IAudioClock IAudioClock_iface;
    IAudioClock2 IAudioClock2_iface;
    IAudioStreamVolume IAudioStreamVolume_iface;

    LONG ref;

    IMMDevice *parent;
    IUnknown *pUnkFTMarshal;

    EDataFlow dataflow;
    float *vols;
    UINT32 channel_count;
    struct oss_stream *stream;

    HANDLE timer;

    AudioSession *session;
    AudioSessionWrapper *session_wrapper;

    struct list entry;

    /* Keep at end */
    char devnode[0];
};

typedef struct _SessionMgr {
    IAudioSessionManager2 IAudioSessionManager2_iface;

    LONG ref;

    IMMDevice *device;
} SessionMgr;

typedef struct _OSSDevice {
    struct list entry;
    EDataFlow flow;
    GUID guid;
    char devnode[0];
} OSSDevice;

static struct list g_devices = LIST_INIT(g_devices);

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','o','s','s','.','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 AudioSessionWrapper *AudioSessionWrapper_Create(ACImpl *client);

static const IAudioClient3Vtbl AudioClient3_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;

static inline ACImpl *impl_from_IAudioClient3(IAudioClient3 *iface)
{
    return CONTAINING_RECORD(iface, ACImpl, IAudioClient3_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:
        if(NtQueryVirtualMemory(GetCurrentProcess(), dll, MemoryWineUnixFuncs,
                                &oss_handle, sizeof(oss_handle), NULL))
            return FALSE;
        g_timer_q = CreateTimerQueue();
        if(!g_timer_q)
            return FALSE;
        break;

    case DLL_PROCESS_DETACH:
        if (!reserved)
        {
            OSSDevice *iter, *iter2;

            DeleteCriticalSection(&g_sessions_lock);

            LIST_FOR_EACH_ENTRY_SAFE(iter, iter2, &g_devices, OSSDevice, entry){
                HeapFree(GetProcessHeap(), 0, iter);
            }
        }
        break;
    }
    return TRUE;
}

int WINAPI AUDDRV_GetPriority(void)
{
    struct test_connect_params params;

    OSS_CALL(test_connect, &params);

    return params.priority;
}

static void oss_lock(struct oss_stream *stream)
{
    pthread_mutex_lock(&stream->lock);
}

static void oss_unlock(struct oss_stream *stream)
{
    pthread_mutex_unlock(&stream->lock);
}

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, const char *device, GUID *guid)
{
    HKEY key = NULL, dev_key;
    DWORD type, size = sizeof(*guid);
    WCHAR key_name[256];

    if(flow == eCapture)
        key_name[0] = '1';
    else
        key_name[0] = '0';
    key_name[1] = ',';
    MultiByteToWideChar(CP_UNIXCP, 0, device, -1, key_name + 2, ARRAY_SIZE(key_name) - 2);

    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);
}

static int open_device(const char *device, EDataFlow flow)
{
    int flags = ((flow == eRender) ? O_WRONLY : O_RDONLY) | O_NONBLOCK;

    return open(device, flags, 0);
}

static void set_stream_volumes(ACImpl *This)
{
    struct oss_stream *stream = This->stream;

    oss_lock(stream);
    stream->mute = This->session->mute;
    oss_unlock(stream);
}

static const OSSDevice *get_ossdevice_from_guid(const GUID *guid)
{
    OSSDevice *dev_item;
    LIST_FOR_EACH_ENTRY(dev_item, &g_devices, OSSDevice, entry)
        if(IsEqualGUID(guid, &dev_item->guid))
            return dev_item;
    return NULL;
}

static void device_add(OSSDevice *oss_dev)
{
    if(get_ossdevice_from_guid(&oss_dev->guid)) /* already in list */
        HeapFree(GetProcessHeap(), 0, oss_dev);
    else
        list_add_tail(&g_devices, &oss_dev->entry);
}

HRESULT WINAPI AUDDRV_GetEndpointIDs(EDataFlow flow, WCHAR ***ids_out, GUID **guids_out,
        UINT *num, UINT *def_index)
{
    struct get_endpoint_ids_params params;
    GUID *guids = NULL;
    WCHAR **ids = NULL;
    unsigned int i;

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

    params.flow = flow;
    params.size = 1000;
    params.endpoints = NULL;
    do{
        HeapFree(GetProcessHeap(), 0, params.endpoints);
        params.endpoints = HeapAlloc(GetProcessHeap(), 0, params.size);
        OSS_CALL(get_endpoint_ids, &params);
    }while(params.result == HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER));

    if(FAILED(params.result)) goto end;

    ids = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, params.num * sizeof(*ids));
    guids = HeapAlloc(GetProcessHeap(), 0, params.num * sizeof(*guids));
    if(!ids || !guids){
        params.result = E_OUTOFMEMORY;
        goto end;
    }

    for(i = 0; i < params.num; i++){
        unsigned int name_size = (strlenW(params.endpoints[i].name) + 1) * sizeof(WCHAR);
        unsigned int dev_size = strlen(params.endpoints[i].device) + 1;
        OSSDevice *oss_dev;

        ids[i] = HeapAlloc(GetProcessHeap(), 0, name_size);
        oss_dev = HeapAlloc(GetProcessHeap(), 0, offsetof(OSSDevice, devnode[dev_size]));
        if(!ids[i] || !oss_dev){
            HeapFree(GetProcessHeap, 0, oss_dev);
            params.result = E_OUTOFMEMORY;
            goto end;
        }
        memcpy(ids[i], params.endpoints[i].name, name_size);
        get_device_guid(flow, params.endpoints[i].device, guids + i);

        oss_dev->flow = flow;
        oss_dev->guid = guids[i];
        memcpy(oss_dev->devnode, params.endpoints[i].device, dev_size);
        device_add(oss_dev);
    }
    *def_index = params.default_idx;

end:
    HeapFree(GetProcessHeap(), 0, params.endpoints);
    if(FAILED(params.result)){
        HeapFree(GetProcessHeap(), 0, guids);
        if(ids){
            for(i = 0; i < params.num; i++)
                HeapFree(GetProcessHeap(), 0, ids[i]);
            HeapFree(GetProcessHeap(), 0, ids);
        }
    }else{
        *ids_out = ids;
        *guids_out = guids;
        *num = params.num;
    }

    return params.result;
}

HRESULT WINAPI AUDDRV_GetAudioEndpoint(GUID *guid, IMMDevice *dev,
        IAudioClient **out)
{
    ACImpl *This;
    const OSSDevice *oss_dev;
    HRESULT hr;
    int len;

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

    oss_dev = get_ossdevice_from_guid(guid);
    if(!oss_dev){
        WARN("Unknown GUID: %s\n", debugstr_guid(guid));
        return AUDCLNT_E_DEVICE_INVALIDATED;
    }
    len = strlen(oss_dev->devnode);
    This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, offsetof(ACImpl, devnode[len + 1]));
    if(!This)
        return E_OUTOFMEMORY;

    hr = CoCreateFreeThreadedMarshaler((IUnknown *)&This->IAudioClient3_iface, &This->pUnkFTMarshal);
    if (FAILED(hr)) {
         HeapFree(GetProcessHeap(), 0, This);
         return hr;
    }

    This->dataflow = oss_dev->flow;
    strcpy(This->devnode, oss_dev->devnode);

    This->IAudioClient3_iface.lpVtbl = &AudioClient3_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->parent = dev;
    IMMDevice_AddRef(This->parent);

    *out = (IAudioClient *)&This->IAudioClient3_iface;
    IAudioClient3_AddRef(&This->IAudioClient3_iface);

    return S_OK;
}

static HRESULT WINAPI AudioClient_QueryInterface(IAudioClient3 *iface,
        REFIID riid, void **ppv)
{
    ACImpl *This = impl_from_IAudioClient3(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_IAudioClient) ||
            IsEqualIID(riid, &IID_IAudioClient2) ||
            IsEqualIID(riid, &IID_IAudioClient3))
        *ppv = iface;
    else if(IsEqualIID(riid, &IID_IMarshal))
        return IUnknown_QueryInterface(This->pUnkFTMarshal, riid, ppv);
    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(IAudioClient3 *iface)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    ULONG ref;
    ref = InterlockedIncrement(&This->ref);
    TRACE("(%p) Refcount now %u\n", This, ref);
    return ref;
}

static ULONG WINAPI AudioClient_Release(IAudioClient3 *iface)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct oss_stream *stream = This->stream;
    ULONG ref;

    ref = InterlockedDecrement(&This->ref);
    TRACE("(%p) Refcount now %u\n", This, ref);
    if(!ref){
        if(This->timer){
            HANDLE event;
            DWORD wait;
            event = CreateEventW(NULL, TRUE, FALSE, NULL);
            wait = !DeleteTimerQueueTimer(g_timer_q, This->timer, event);
            wait = wait && GetLastError() == ERROR_IO_PENDING;
            if(event && wait)
                WaitForSingleObject(event, INFINITE);
            CloseHandle(event);
        }

        IAudioClient3_Stop(iface);
        IMMDevice_Release(This->parent);
        IUnknown_Release(This->pUnkFTMarshal);
        if(This->session){
            EnterCriticalSection(&g_sessions_lock);
            list_remove(&This->entry);
            LeaveCriticalSection(&g_sessions_lock);
        }
        HeapFree(GetProcessHeap(), 0, This->vols);
        if(stream){
            close(stream->fd);
            HeapFree(GetProcessHeap(), 0, stream->local_buffer);
            HeapFree(GetProcessHeap(), 0, stream->tmp_buffer);
            CoTaskMemFree(stream->fmt);
            pthread_mutex_destroy(&stream->lock);
            HeapFree(GetProcessHeap(), 0, stream);
        }
        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 int get_oss_format(const WAVEFORMATEX *fmt)
{
    WAVEFORMATEXTENSIBLE *fmtex = (WAVEFORMATEXTENSIBLE*)fmt;

    if(fmt->wFormatTag == WAVE_FORMAT_PCM ||
            (fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))){
        switch(fmt->wBitsPerSample){
        case 8:
            return AFMT_U8;
        case 16:
            return AFMT_S16_LE;
        case 24:
            return AFMT_S24_LE;
        case 32:
            return AFMT_S32_LE;
        }
        return -1;
    }

#ifdef AFMT_FLOAT
    if(fmt->wFormatTag == WAVE_FORMAT_IEEE_FLOAT ||
            (fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_IEEE_FLOAT))){
        if(fmt->wBitsPerSample != 32)
            return -1;

        return AFMT_FLOAT;
    }
#endif

    return -1;
}

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 setup_oss_device(AUDCLNT_SHAREMODE mode, int fd,
        const WAVEFORMATEX *fmt, WAVEFORMATEX **out)
{
    int tmp, oss_format;
    double tenth;
    HRESULT ret = S_OK;
    WAVEFORMATEX *closest = NULL;

    tmp = oss_format = get_oss_format(fmt);
    if(oss_format < 0)
        return AUDCLNT_E_UNSUPPORTED_FORMAT;
    if(ioctl(fd, SNDCTL_DSP_SETFMT, &tmp) < 0){
        WARN("SETFMT failed: %d (%s)\n", errno, strerror(errno));
        return E_FAIL;
    }
    if(tmp != oss_format){
        TRACE("Format unsupported by this OSS version: %x\n", oss_format);
        return AUDCLNT_E_UNSUPPORTED_FORMAT;
    }

    if(fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
            (fmt->nAvgBytesPerSec == 0 ||
             fmt->nBlockAlign == 0 ||
             ((WAVEFORMATEXTENSIBLE*)fmt)->Samples.wValidBitsPerSample > fmt->wBitsPerSample))
        return E_INVALIDARG;

    if(fmt->nChannels == 0)
        return AUDCLNT_E_UNSUPPORTED_FORMAT;

    closest = clone_format(fmt);
    if(!closest)
        return E_OUTOFMEMORY;

    tmp = fmt->nSamplesPerSec;
    if(ioctl(fd, SNDCTL_DSP_SPEED, &tmp) < 0){
        WARN("SPEED failed: %d (%s)\n", errno, strerror(errno));
        CoTaskMemFree(closest);
        return E_FAIL;
    }
    tenth = fmt->nSamplesPerSec * 0.1;
    if(tmp > fmt->nSamplesPerSec + tenth || tmp < fmt->nSamplesPerSec - tenth){
        ret = S_FALSE;
        closest->nSamplesPerSec = tmp;
    }

    tmp = fmt->nChannels;
    if(ioctl(fd, SNDCTL_DSP_CHANNELS, &tmp) < 0){
        WARN("CHANNELS failed: %d (%s)\n", errno, strerror(errno));
        CoTaskMemFree(closest);
        return E_FAIL;
    }
    if(tmp != fmt->nChannels){
        ret = S_FALSE;
        closest->nChannels = tmp;
    }

    if(closest->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
        ((WAVEFORMATEXTENSIBLE*)closest)->dwChannelMask = get_channel_mask(closest->nChannels);

    if(fmt->nBlockAlign != fmt->nChannels * fmt->wBitsPerSample / 8 ||
            fmt->nAvgBytesPerSec != fmt->nBlockAlign * fmt->nSamplesPerSec ||
            (fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
             ((WAVEFORMATEXTENSIBLE*)fmt)->Samples.wValidBitsPerSample < fmt->wBitsPerSample))
        ret = S_FALSE;

    if(mode == AUDCLNT_SHAREMODE_EXCLUSIVE &&
            fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE){
        if(((WAVEFORMATEXTENSIBLE*)fmt)->dwChannelMask == 0 ||
                ((WAVEFORMATEXTENSIBLE*)fmt)->dwChannelMask & SPEAKER_RESERVED)
            ret = S_FALSE;
    }

    if(ret == S_FALSE && !out)
        ret = AUDCLNT_E_UNSUPPORTED_FORMAT;

    if(ret == S_FALSE && out){
        closest->nBlockAlign =
            closest->nChannels * closest->wBitsPerSample / 8;
        closest->nAvgBytesPerSec =
            closest->nBlockAlign * closest->nSamplesPerSec;
        if(closest->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
            ((WAVEFORMATEXTENSIBLE*)closest)->Samples.wValidBitsPerSample = closest->wBitsPerSample;
        *out = closest;
    } else
        CoTaskMemFree(closest);

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

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);

    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(IAudioClient3 *iface,
        AUDCLNT_SHAREMODE mode, DWORD flags, REFERENCE_TIME duration,
        REFERENCE_TIME period, const WAVEFORMATEX *fmt,
        const GUID *sessionguid)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct oss_stream *stream;
    oss_audioinfo ai;
    int i;
    HRESULT hr;

    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 E_INVALIDARG;

    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 |
                AUDCLNT_STREAMFLAGS_SRC_DEFAULT_QUALITY |
                AUDCLNT_STREAMFLAGS_AUTOCONVERTPCM)){
        FIXME("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 */
        }
    }

    EnterCriticalSection(&g_sessions_lock);

    if(This->stream){
        LeaveCriticalSection(&g_sessions_lock);
        return AUDCLNT_E_ALREADY_INITIALIZED;
    }

    stream = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*This->stream));
    if(!stream){
        LeaveCriticalSection(&g_sessions_lock);
        return E_OUTOFMEMORY;
    }
    stream->flow = This->dataflow;
    pthread_mutex_init(&stream->lock, NULL);

    stream->fd = open_device(This->devnode, This->dataflow);
    if(stream->fd < 0){
        WARN("Unable to open device %s: %d (%s)\n", This->devnode, errno, strerror(errno));
        hr = AUDCLNT_E_DEVICE_INVALIDATED;
        goto exit;
    }

    ai.dev = -1;
    if(ioctl(stream->fd, SNDCTL_ENGINEINFO, &ai) < 0){
        WARN("Unable to get audio info for device %s: %d (%s)\n", This->devnode, errno, strerror(errno));
        hr = E_FAIL;
        goto exit;
    }

    TRACE("OSS audioinfo:\n");
    TRACE("devnode: %s\n", ai.devnode);
    TRACE("name: %s\n", ai.name);
    TRACE("busy: %x\n", ai.busy);
    TRACE("caps: %x\n", ai.caps);
    TRACE("iformats: %x\n", ai.iformats);
    TRACE("oformats: %x\n", ai.oformats);
    TRACE("enabled: %d\n", ai.enabled);
    TRACE("min_rate: %d\n", ai.min_rate);
    TRACE("max_rate: %d\n", ai.max_rate);
    TRACE("min_channels: %d\n", ai.min_channels);
    TRACE("max_channels: %d\n", ai.max_channels);

    hr = setup_oss_device(mode, stream->fd, fmt, NULL);
    if(FAILED(hr))
        goto exit;

    stream->fmt = clone_format(fmt);
    if(!stream->fmt){
        hr = E_OUTOFMEMORY;
        goto exit;
    }

    stream->period_us = period / 10;
    stream->period_frames = MulDiv(fmt->nSamplesPerSec, period, 10000000);

    stream->bufsize_frames = MulDiv(duration, fmt->nSamplesPerSec, 10000000);
    if(mode == AUDCLNT_SHAREMODE_EXCLUSIVE)
        stream->bufsize_frames -= stream->bufsize_frames % stream->period_frames;
    stream->local_buffer = HeapAlloc(GetProcessHeap(), 0,
            stream->bufsize_frames * fmt->nBlockAlign);
    if(!stream->local_buffer){
        hr = E_OUTOFMEMORY;
        goto exit;
    }

    This->channel_count = fmt->nChannels;
    This->vols = HeapAlloc(GetProcessHeap(), 0, This->channel_count * sizeof(float));
    if(!This->vols){
        hr = E_OUTOFMEMORY;
        goto exit;
    }
    for(i = 0; i < This->channel_count; ++i)
        This->vols[i] = 1.f;

    stream->share = mode;
    stream->flags = flags;
    stream->oss_bufsize_bytes = 0;

    hr = get_audio_session(sessionguid, This->parent, This->channel_count,
            &This->session);

exit:
    if(FAILED(hr)){
        HeapFree(GetProcessHeap(), 0, This->vols);
        This->vols = NULL;
        CoTaskMemFree(stream->fmt);
        if(stream->fd >= 0) close(stream->fd);
        HeapFree(GetProcessHeap(), 0, stream->local_buffer);
        pthread_mutex_destroy(&stream->lock);
        HeapFree(GetProcessHeap(), 0, stream);
    } else {
        list_add_tail(&This->session->clients, &This->entry);
        This->stream = stream;
        set_stream_volumes(This);
    }

    LeaveCriticalSection(&g_sessions_lock);

    return hr;
}

static HRESULT WINAPI AudioClient_GetBufferSize(IAudioClient3 *iface,
        UINT32 *frames)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct oss_stream *stream = This->stream;

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

    if(!frames)
        return E_POINTER;

    if(!This->stream)
        return AUDCLNT_E_NOT_INITIALIZED;

    oss_lock(stream);

    *frames = stream->bufsize_frames;

    TRACE("buffer size: %u\n", *frames);

    oss_unlock(stream);

    return S_OK;
}

static HRESULT WINAPI AudioClient_GetStreamLatency(IAudioClient3 *iface,
        REFERENCE_TIME *latency)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct oss_stream *stream = This->stream;

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

    if(!latency)
        return E_POINTER;

    if(!This->stream)
        return AUDCLNT_E_NOT_INITIALIZED;

    oss_lock(stream);

    /* pretend we process audio in Period chunks, so max latency includes
     * the period time.  Some native machines add .6666ms in shared mode. */
    *latency = (REFERENCE_TIME)stream->period_us * 10 + 6666;

    oss_unlock(stream);

    return S_OK;
}

static HRESULT WINAPI AudioClient_GetCurrentPadding(IAudioClient3 *iface,
        UINT32 *numpad)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct oss_stream *stream = This->stream;

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

    if(!numpad)
        return E_POINTER;

    if(!This->stream)
        return AUDCLNT_E_NOT_INITIALIZED;

    oss_lock(stream);

    *numpad = stream->held_frames;

    TRACE("padding: %u\n", *numpad);

    oss_unlock(stream);

    return S_OK;
}

static HRESULT WINAPI AudioClient_IsFormatSupported(IAudioClient3 *iface,
        AUDCLNT_SHAREMODE mode, const WAVEFORMATEX *fmt,
        WAVEFORMATEX **out)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct is_format_supported_params params;

    TRACE("(%p)->(%x, %p, %p)\n", This, mode, fmt, out);
    if(fmt) dump_fmt(fmt);

    params.device = This->devnode;
    params.flow = This->dataflow;
    params.share = mode;
    params.fmt_in = fmt;
    params.fmt_out = NULL;

    if(out){
        *out = NULL;
        if(mode == AUDCLNT_SHAREMODE_SHARED)
            params.fmt_out = CoTaskMemAlloc(sizeof(*params.fmt_out));
    }
    OSS_CALL(is_format_supported, &params);

    if(params.result == S_FALSE)
        *out = &params.fmt_out->Format;
    else
        CoTaskMemFree(params.fmt_out);

    return params.result;
}

static HRESULT WINAPI AudioClient_GetMixFormat(IAudioClient3 *iface,
        WAVEFORMATEX **pwfx)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct get_mix_format_params params;

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

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

    params.device = This->devnode;
    params.flow = This->dataflow;
    params.fmt = CoTaskMemAlloc(sizeof(WAVEFORMATEXTENSIBLE));
    if(!params.fmt)
        return E_OUTOFMEMORY;

    OSS_CALL(get_mix_format, &params);

    if(SUCCEEDED(params.result)){
        *pwfx = &params.fmt->Format;
        dump_fmt(*pwfx);
    } else
        CoTaskMemFree(params.fmt);

    return params.result;
}

static HRESULT WINAPI AudioClient_GetDevicePeriod(IAudioClient3 *iface,
        REFERENCE_TIME *defperiod, REFERENCE_TIME *minperiod)
{
    ACImpl *This = impl_from_IAudioClient3(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;
}

static void silence_buffer(struct oss_stream *stream, BYTE *buffer, UINT32 frames)
{
    WAVEFORMATEXTENSIBLE *fmtex = (WAVEFORMATEXTENSIBLE*)stream->fmt;
    if((stream->fmt->wFormatTag == WAVE_FORMAT_PCM ||
            (stream->fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))) &&
            stream->fmt->wBitsPerSample == 8)
        memset(buffer, 128, frames * stream->fmt->nBlockAlign);
    else
        memset(buffer, 0, frames * stream->fmt->nBlockAlign);
}

static void oss_write_data(struct oss_stream *stream)
{
    ssize_t written_bytes;
    UINT32 written_frames, in_oss_frames, write_limit, max_period, write_offs_frames, new_frames;
    SIZE_T to_write_frames, to_write_bytes, advanced;
    audio_buf_info bi;
    BYTE *buf;

    if(ioctl(stream->fd, SNDCTL_DSP_GETOSPACE, &bi) < 0){
        WARN("GETOSPACE failed: %d (%s)\n", errno, strerror(errno));
        return;
    }

    max_period = max(bi.fragsize / stream->fmt->nBlockAlign, stream->period_frames);

    if(bi.bytes > stream->oss_bufsize_bytes){
        TRACE("New buffer size (%u) is larger than old buffer size (%u)\n",
                bi.bytes, stream->oss_bufsize_bytes);
        stream->oss_bufsize_bytes = bi.bytes;
        in_oss_frames = 0;
    }else
        in_oss_frames = (stream->oss_bufsize_bytes - bi.bytes) / stream->fmt->nBlockAlign;

    if(in_oss_frames > stream->in_oss_frames){
        TRACE("Capping reported frames from %u to %u\n",
                in_oss_frames, stream->in_oss_frames);
        in_oss_frames = stream->in_oss_frames;
    }

    write_limit = 0;
    while(write_limit + in_oss_frames < max_period * 3)
        write_limit += max_period;
    if(write_limit == 0)
        return;

    /*        vvvvvv - in_oss_frames
     * [--xxxxxxxxxx]
     *       [xxxxxxxxxx--]
     *        ^^^^^^^^^^ - held_frames
     *        ^ - lcl_offs_frames
     */
    advanced = stream->in_oss_frames - in_oss_frames;
    if(advanced > stream->held_frames)
        advanced = stream->held_frames;
    stream->lcl_offs_frames += advanced;
    stream->lcl_offs_frames %= stream->bufsize_frames;
    stream->held_frames -= advanced;
    stream->in_oss_frames = in_oss_frames;
    TRACE("advanced by %lu, lcl_offs: %u, held: %u, in_oss: %u\n",
            advanced, stream->lcl_offs_frames, stream->held_frames, stream->in_oss_frames);


    if(stream->held_frames == stream->in_oss_frames)
        return;

    write_offs_frames = (stream->lcl_offs_frames + stream->in_oss_frames) % stream->bufsize_frames;
    new_frames = stream->held_frames - stream->in_oss_frames;

    if(write_offs_frames + new_frames > stream->bufsize_frames)
        to_write_frames = stream->bufsize_frames - write_offs_frames;
    else
        to_write_frames = new_frames;

    to_write_frames = min(to_write_frames, write_limit);
    to_write_bytes = to_write_frames * stream->fmt->nBlockAlign;
    TRACE("going to write %lu frames from %u (%lu of %u)\n", to_write_frames,
            write_offs_frames, to_write_frames + write_offs_frames,
            stream->bufsize_frames);

    buf = stream->local_buffer + write_offs_frames * stream->fmt->nBlockAlign;

    if(stream->mute)
        silence_buffer(stream, buf, to_write_frames);

    written_bytes = write(stream->fd, buf, to_write_bytes);
    if(written_bytes < 0){
        /* EAGAIN is OSS buffer full, log that too */
        WARN("write failed: %d (%s)\n", errno, strerror(errno));
        return;
    }
    written_frames = written_bytes / stream->fmt->nBlockAlign;

    stream->in_oss_frames += written_frames;

    if(written_frames < to_write_frames){
        /* OSS buffer probably full */
        return;
    }

    if(new_frames > written_frames && written_frames < write_limit){
        /* wrapped and have some data back at the start to write */

        to_write_frames = min(write_limit - written_frames, new_frames - written_frames);
        to_write_bytes = to_write_frames * stream->fmt->nBlockAlign;

        if(stream->mute)
            silence_buffer(stream, stream->local_buffer, to_write_frames);

        TRACE("wrapping to write %lu frames from beginning\n", to_write_frames);

        written_bytes = write(stream->fd, stream->local_buffer, to_write_bytes);
        if(written_bytes < 0){
            WARN("write failed: %d (%s)\n", errno, strerror(errno));
            return;
        }
        written_frames = written_bytes / stream->fmt->nBlockAlign;
        stream->in_oss_frames += written_frames;
    }
}

static void oss_read_data(struct oss_stream *stream)
{
    UINT64 pos, readable;
    ssize_t nread;

    pos = (stream->held_frames + stream->lcl_offs_frames) % stream->bufsize_frames;
    readable = (stream->bufsize_frames - pos) * stream->fmt->nBlockAlign;

    nread = read(stream->fd, stream->local_buffer + pos * stream->fmt->nBlockAlign,
            readable);
    if(nread < 0){
        WARN("read failed: %d (%s)\n", errno, strerror(errno));
        return;
    }

    stream->held_frames += nread / stream->fmt->nBlockAlign;

    if(stream->held_frames > stream->bufsize_frames){
        WARN("Overflow of unread data\n");
        stream->lcl_offs_frames += stream->held_frames;
        stream->lcl_offs_frames %= stream->bufsize_frames;
        stream->held_frames = stream->bufsize_frames;
    }
}

static void CALLBACK oss_period_callback(void *user, BOOLEAN timer)
{
    ACImpl *This = user;
    struct oss_stream *stream = This->stream;

    oss_lock(stream);

    if(stream->playing){
        if(stream->flow == eRender && stream->held_frames)
            oss_write_data(stream);
        else if(stream->flow == eCapture)
            oss_read_data(stream);
    }

    if(stream->event)
        SetEvent(stream->event);

    oss_unlock(stream);
}

static HRESULT WINAPI AudioClient_Start(IAudioClient3 *iface)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct oss_stream *stream = This->stream;

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

    EnterCriticalSection(&g_sessions_lock);

    if(!This->stream){
        LeaveCriticalSection(&g_sessions_lock);
        return AUDCLNT_E_NOT_INITIALIZED;
    }

    oss_lock(stream);

    if((stream->flags & AUDCLNT_STREAMFLAGS_EVENTCALLBACK) && !stream->event){
        oss_unlock(stream);
        LeaveCriticalSection(&g_sessions_lock);
        return AUDCLNT_E_EVENTHANDLE_NOT_SET;
    }

    if(stream->playing){
        oss_unlock(stream);
        LeaveCriticalSection(&g_sessions_lock);
        return AUDCLNT_E_NOT_STOPPED;
    }

    if(!This->timer){
        if(!CreateTimerQueueTimer(&This->timer, g_timer_q,
                    oss_period_callback, This, 0, stream->period_us / 1000,
                    WT_EXECUTEINTIMERTHREAD))
            ERR("Unable to create period timer: %u\n", GetLastError());
    }

    stream->playing = TRUE;

    oss_unlock(stream);
    LeaveCriticalSection(&g_sessions_lock);

    return S_OK;
}

static HRESULT WINAPI AudioClient_Stop(IAudioClient3 *iface)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct oss_stream *stream = This->stream;

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

    if(!This->stream)
        return AUDCLNT_E_NOT_INITIALIZED;

    oss_lock(stream);

    if(!stream->playing){
        oss_unlock(stream);
        return S_FALSE;
    }

    stream->playing = FALSE;
    stream->in_oss_frames = 0;

    oss_unlock(stream);

    return S_OK;
}

static HRESULT WINAPI AudioClient_Reset(IAudioClient3 *iface)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct oss_stream *stream = This->stream;

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

    if(!This->stream)
        return AUDCLNT_E_NOT_INITIALIZED;

    oss_lock(stream);

    if(stream->playing){
        oss_unlock(stream);
        return AUDCLNT_E_NOT_STOPPED;
    }

    if(stream->getbuf_last){
        oss_unlock(stream);
        return AUDCLNT_E_BUFFER_OPERATION_PENDING;
    }

    if(stream->flow == eRender){
        stream->written_frames = 0;
        stream->last_pos_frames = 0;
    }else{
        stream->written_frames += stream->held_frames;
    }
    stream->held_frames = 0;
    stream->lcl_offs_frames = 0;
    stream->in_oss_frames = 0;

    oss_unlock(stream);

    return S_OK;
}

static HRESULT WINAPI AudioClient_SetEventHandle(IAudioClient3 *iface,
        HANDLE event)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    struct oss_stream *stream = This->stream;

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

    if(!event)
        return E_INVALIDARG;

    if(!This->stream)
        return AUDCLNT_E_NOT_INITIALIZED;

    oss_lock(stream);

    if(!(stream->flags & AUDCLNT_STREAMFLAGS_EVENTCALLBACK)){
        oss_unlock(stream);
        return AUDCLNT_E_EVENTHANDLE_NOT_EXPECTED;
    }

    if (stream->event){
        oss_unlock(stream);
        FIXME("called twice\n");
        return HRESULT_FROM_WIN32(ERROR_INVALID_NAME);
    }

    stream->event = event;

    oss_unlock(stream);

    return S_OK;
}

static HRESULT WINAPI AudioClient_GetService(IAudioClient3 *iface, REFIID riid,
        void **ppv)
{
    ACImpl *This = impl_from_IAudioClient3(iface);

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

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

    EnterCriticalSection(&g_sessions_lock);

    if(!This->stream){
        LeaveCriticalSection(&g_sessions_lock);
        return AUDCLNT_E_NOT_INITIALIZED;
    }

    if(IsEqualIID(riid, &IID_IAudioRenderClient)){
        if(This->dataflow != eRender){
            LeaveCriticalSection(&g_sessions_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){
            LeaveCriticalSection(&g_sessions_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){
                LeaveCriticalSection(&g_sessions_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){
                LeaveCriticalSection(&g_sessions_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){
                LeaveCriticalSection(&g_sessions_lock);
                return E_OUTOFMEMORY;
            }
        }else
            ISimpleAudioVolume_AddRef(&This->session_wrapper->ISimpleAudioVolume_iface);

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

    if(*ppv){
        LeaveCriticalSection(&g_sessions_lock);
        return S_OK;
    }

    LeaveCriticalSection(&g_sessions_lock);

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

static HRESULT WINAPI AudioClient_IsOffloadCapable(IAudioClient3 *iface,
        AUDIO_STREAM_CATEGORY category, BOOL *offload_capable)
{
    ACImpl *This = impl_from_IAudioClient3(iface);

    TRACE("(%p)->(0x%x, %p)\n", This, category, offload_capable);

    if(!offload_capable)
        return E_INVALIDARG;

    *offload_capable = FALSE;

    return S_OK;
}

static HRESULT WINAPI AudioClient_SetClientProperties(IAudioClient3 *iface,
        const AudioClientProperties *prop)
{
    ACImpl *This = impl_from_IAudioClient3(iface);
    const Win8AudioClientProperties *legacy_prop = (const Win8AudioClientProperties *)prop;

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

    if(!legacy_prop)
        return E_POINTER;

    if(legacy_prop->cbSize == sizeof(AudioClientProperties)){
        TRACE("{ bIsOffload: %u, eCategory: 0x%x, Options: 0x%x }\n",
                legacy_prop->bIsOffload,
                legacy_prop->eCategory,
                prop->Options);
    }else if(legacy_prop->cbSize == sizeof(Win8AudioClientProperties)){
        TRACE("{ bIsOffload: %u, eCategory: 0x%x }\n",
                legacy_prop->bIsOffload,
                legacy_prop->eCategory);
    }else{
        WARN("Unsupported Size = %d\n", legacy_prop->cbSize);
        return E_INVALIDARG;
    }


    if(legacy_prop->bIsOffload)
        return AUDCLNT_E_ENDPOINT_OFFLOAD_NOT_CAPABLE;

    return S_OK;
}

static HRESULT WINAPI AudioClient_GetBufferSizeLimits(IAudioClient3 *iface,
        const WAVEFORMATEX *format, BOOL event_driven, REFERENCE_TIME *min_duration,
        REFERENCE_TIME *max_duration)
{
    ACImpl *This = impl_from_IAudioClient3(iface);

    FIXME("(%p)->(%p, %u, %p, %p)\n", This, format, event_driven, min_duration, max_duration);

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioClient_GetSharedModeEnginePeriod(IAudioClient3 *iface,
        const WAVEFORMATEX *format, UINT32 *default_period_frames, UINT32 *unit_period_frames,
        UINT32 *min_period_frames, UINT32 *max_period_frames)
{
    ACImpl *This = impl_from_IAudioClient3(iface);

    FIXME("(%p)->(%p, %p, %p, %p, %p)\n", This, format, default_period_frames, unit_period_frames,
            min_period_frames, max_period_frames);

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioClient_GetCurrentSharedModeEnginePeriod(IAudioClient3 *iface,
        WAVEFORMATEX **cur_format, UINT32 *cur_period_frames)
{
    ACImpl *This = impl_from_IAudioClient3(iface);

    FIXME("(%p)->(%p, %p)\n", This, cur_format, cur_period_frames);

    return E_NOTIMPL;
}

static HRESULT WINAPI AudioClient_InitializeSharedAudioStream(IAudioClient3 *iface,
        DWORD flags, UINT32 period_frames, const WAVEFORMATEX *format,
        const GUID *session_guid)
{
    ACImpl *This = impl_from_IAudioClient3(iface);

    FIXME("(%p)->(0x%x, %u, %p, %s)\n", This, flags, period_frames, format, debugstr_guid(session_guid));

    return E_NOTIMPL;
}

static const IAudioClient3Vtbl AudioClient3_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,
    AudioClient_IsOffloadCapable,
    AudioClient_SetClientProperties,
    AudioClient_GetBufferSizeLimits,
    AudioClient_GetSharedModeEnginePeriod,
    AudioClient_GetCurrentSharedModeEnginePeriod,
    AudioClient_InitializeSharedAudioStream,
};

static HRESULT WINAPI AudioRenderClient_QueryInterface(
        IAudioRenderClient *iface, REFIID riid, void **ppv)
{
    ACImpl *This = impl_from_IAudioRenderClient(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_IAudioRenderClient))
        *ppv = iface;
    else if(IsEqualIID(riid, &IID_IMarshal))
        return IUnknown_QueryInterface(This->pUnkFTMarshal, riid, ppv);
    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->IAudioClient3_iface);
}

static ULONG WINAPI AudioRenderClient_Release(IAudioRenderClient *iface)
{
    ACImpl *This = impl_from_IAudioRenderClient(iface);
    return AudioClient_Release(&This->IAudioClient3_iface);
}

static HRESULT WINAPI AudioRenderClient_GetBuffer(IAudioRenderClient *iface,
        UINT32 frames, BYTE **data)
{
    ACImpl *This = impl_from_IAudioRenderClient(iface);
    struct oss_stream *stream = This->stream;
    UINT32 write_pos;

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

    if(!data)
        return E_POINTER;

    *data = NULL;

    oss_lock(stream);

    if(stream->getbuf_last){
        oss_unlock(stream);
        return AUDCLNT_E_OUT_OF_ORDER;
    }

    if(!frames){
        oss_unlock(stream);
        return S_OK;
    }

    if(stream->held_frames + frames > stream->bufsize_frames){
        oss_unlock(stream);
        return AUDCLNT_E_BUFFER_TOO_LARGE;
    }

    write_pos =
        (stream->lcl_offs_frames + stream->held_frames) % stream->bufsize_frames;
    if(write_pos + frames > stream->bufsize_frames){
        if(stream->tmp_buffer_frames < frames){
            HeapFree(GetProcessHeap(), 0, stream->tmp_buffer);
            stream->tmp_buffer = HeapAlloc(GetProcessHeap(), 0,
                    frames * stream->fmt->nBlockAlign);
            if(!stream->tmp_buffer){
                oss_unlock(stream);
                return E_OUTOFMEMORY;
            }
            stream->tmp_buffer_frames = frames;
        }
        *data = stream->tmp_buffer;
        stream->getbuf_last = -frames;
    }else{
        *data = stream->local_buffer + write_pos * stream->fmt->nBlockAlign;
        stream->getbuf_last = frames;
    }

    silence_buffer(stream, *data, frames);

    oss_unlock(stream);

    return S_OK;
}

static void oss_wrap_buffer(struct oss_stream *stream, BYTE *buffer, UINT32 written_frames)
{
    UINT32 write_offs_frames =
        (stream->lcl_offs_frames + stream->held_frames) % stream->bufsize_frames;
    UINT32 write_offs_bytes = write_offs_frames * stream->fmt->nBlockAlign;
    UINT32 chunk_frames = stream->bufsize_frames - write_offs_frames;
    UINT32 chunk_bytes = chunk_frames * stream->fmt->nBlockAlign;
    UINT32 written_bytes = written_frames * stream->fmt->nBlockAlign;

    if(written_bytes <= chunk_bytes){
        memcpy(stream->local_buffer + write_offs_bytes, buffer, written_bytes);
    }else{
        memcpy(stream->local_buffer + write_offs_bytes, buffer, chunk_bytes);
        memcpy(stream->local_buffer, buffer + chunk_bytes,
                written_bytes - chunk_bytes);
    }
}

static HRESULT WINAPI AudioRenderClient_ReleaseBuffer(
        IAudioRenderClient *iface, UINT32 written_frames, DWORD flags)
{
    ACImpl *This = impl_from_IAudioRenderClient(iface);
    struct oss_stream *stream = This->stream;
    BYTE *buffer;

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

    oss_lock(stream);

    if(!written_frames){
        stream->getbuf_last = 0;
        oss_unlock(stream);
        return S_OK;
    }

    if(!stream->getbuf_last){
        oss_unlock(stream);
        return AUDCLNT_E_OUT_OF_ORDER;
    }

    if(written_frames > (stream->getbuf_last >= 0 ? stream->getbuf_last : -stream->getbuf_last)){
        oss_unlock(stream);
        return AUDCLNT_E_INVALID_SIZE;
    }

    if(stream->getbuf_last >= 0)
        buffer = stream->local_buffer + stream->fmt->nBlockAlign *
          ((stream->lcl_offs_frames + stream->held_frames) % stream->bufsize_frames);
    else
        buffer = stream->tmp_buffer;

    if(flags & AUDCLNT_BUFFERFLAGS_SILENT)
        silence_buffer(stream, buffer, written_frames);

    if(stream->getbuf_last < 0)
        oss_wrap_buffer(stream, buffer, written_frames);

    stream->held_frames += written_frames;
    stream->written_frames += written_frames;
    stream->getbuf_last = 0;

    oss_unlock(stream);

    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)
{
    ACImpl *This = impl_from_IAudioCaptureClient(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_IAudioCaptureClient))
        *ppv = iface;
    else if(IsEqualIID(riid, &IID_IMarshal))
        return IUnknown_QueryInterface(This->pUnkFTMarshal, riid, ppv);
    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 IAudioClient3_AddRef(&This->IAudioClient3_iface);
}

static ULONG WINAPI AudioCaptureClient_Release(IAudioCaptureClient *iface)
{
    ACImpl *This = impl_from_IAudioCaptureClient(iface);
    return IAudioClient3_Release(&This->IAudioClient3_iface);
}

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

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

    if(!data)
        return E_POINTER;

    *data = NULL;

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

    oss_lock(stream);

    if(stream->getbuf_last){
        oss_unlock(stream);
        return AUDCLNT_E_OUT_OF_ORDER;
    }

    if(stream->held_frames < stream->period_frames){
        *frames = 0;
        oss_unlock(stream);
        return AUDCLNT_S_BUFFER_EMPTY;
    }

    *flags = 0;

    *frames = stream->period_frames;

    if(stream->lcl_offs_frames + *frames > stream->bufsize_frames){
        UINT32 chunk_bytes, offs_bytes, frames_bytes;
        if(stream->tmp_buffer_frames < *frames){
            HeapFree(GetProcessHeap(), 0, stream->tmp_buffer);
            stream->tmp_buffer = HeapAlloc(GetProcessHeap(), 0,
                    *frames * stream->fmt->nBlockAlign);
            if(!stream->tmp_buffer){
                oss_unlock(stream);
                return E_OUTOFMEMORY;
            }
            stream->tmp_buffer_frames = *frames;
        }

        *data = stream->tmp_buffer;
        chunk_bytes = (stream->bufsize_frames - stream->lcl_offs_frames) *
            stream->fmt->nBlockAlign;
        offs_bytes = stream->lcl_offs_frames * stream->fmt->nBlockAlign;
        frames_bytes = *frames * stream->fmt->nBlockAlign;
        memcpy(stream->tmp_buffer, stream->local_buffer + offs_bytes, chunk_bytes);
        memcpy(stream->tmp_buffer + chunk_bytes, stream->local_buffer,
                frames_bytes - chunk_bytes);
    }else
        *data = stream->local_buffer +
            stream->lcl_offs_frames * stream->fmt->nBlockAlign;

    stream->getbuf_last = *frames;

    if(devpos)
       *devpos = stream->written_frames;
    if(qpcpos){
        LARGE_INTEGER stamp, freq;
        QueryPerformanceCounter(&stamp);
        QueryPerformanceFrequency(&freq);
        *qpcpos = (stamp.QuadPart * (INT64)10000000) / freq.QuadPart;
    }

    oss_unlock(stream);

    return *frames ? S_OK : AUDCLNT_S_BUFFER_EMPTY;
}

static HRESULT WINAPI AudioCaptureClient_ReleaseBuffer(
        IAudioCaptureClient *iface, UINT32 done)
{
    ACImpl *This = impl_from_IAudioCaptureClient(iface);
    struct oss_stream *stream = This->stream;

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

    oss_lock(stream);

    if(!done){
        stream->getbuf_last = 0;
        oss_unlock(stream);
        return S_OK;
    }

    if(!stream->getbuf_last){
        oss_unlock(stream);
        return AUDCLNT_E_OUT_OF_ORDER;
    }

    if(stream->getbuf_last != done){
        oss_unlock(stream);
        return AUDCLNT_E_INVALID_SIZE;
    }

    stream->written_frames += done;
    stream->held_frames -= done;
    stream->lcl_offs_frames += done;
    stream->lcl_offs_frames %= stream->bufsize_frames;
    stream->getbuf_last = 0;

    oss_unlock(stream);

    return S_OK;
}

static HRESULT WINAPI AudioCaptureClient_GetNextPacketSize(
        IAudioCaptureClient *iface, UINT32 *frames)
{
    ACImpl *This = impl_from_IAudioCaptureClient(iface);
    struct oss_stream *stream = This->stream;

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

    if(!frames)
        return E_POINTER;

    oss_lock(stream);

    *frames = stream->held_frames < stream->period_frames ? 0 : stream->period_frames;

    oss_unlock(stream);

    return S_OK;
}

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 IAudioClient3_AddRef(&This->IAudioClient3_iface);
}

static ULONG WINAPI AudioClock_Release(IAudioClock *iface)
{
    ACImpl *This = impl_from_IAudioClock(iface);
    return IAudioClient3_Release(&This->IAudioClient3_iface);
}

static HRESULT WINAPI AudioClock_GetFrequency(IAudioClock *iface, UINT64 *freq)
{
    ACImpl *This = impl_from_IAudioClock(iface);
    struct oss_stream *stream = This->stream;

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

    if(stream->share == AUDCLNT_SHAREMODE_SHARED)
        *freq = (UINT64)stream->fmt->nSamplesPerSec * stream->fmt->nBlockAlign;
    else
        *freq = stream->fmt->nSamplesPerSec;

    return S_OK;
}

static HRESULT WINAPI AudioClock_GetPosition(IAudioClock *iface, UINT64 *pos,
        UINT64 *qpctime)
{
    ACImpl *This = impl_from_IAudioClock(iface);
    struct oss_stream *stream = This->stream;

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

    if(!pos)
        return E_POINTER;

    oss_lock(stream);

    if(stream->flow == eRender){
        *pos = stream->written_frames - stream->held_frames;
        if(*pos < stream->last_pos_frames)
            *pos = stream->last_pos_frames;
    }else if(stream->flow == eCapture){
        audio_buf_info bi;
        UINT32 held;

        if(ioctl(stream->fd, SNDCTL_DSP_GETISPACE, &bi) < 0){
            TRACE("GETISPACE failed: %d (%s)\n", errno, strerror(errno));
            held = 0;
        }else{
            if(bi.bytes <= bi.fragsize)
                held = 0;
            else
                held = bi.bytes / stream->fmt->nBlockAlign;
        }

        *pos = stream->written_frames + held;
    }

    stream->last_pos_frames = *pos;

    TRACE("returning: %s\n", wine_dbgstr_longlong(*pos));
    if(stream->share == AUDCLNT_SHAREMODE_SHARED)
        *pos *= stream->fmt->nBlockAlign;

    oss_unlock(stream);

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

    return S_OK;
}

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 IAudioClient3_AddRef(&This->IAudioClient3_iface);
}

static ULONG WINAPI AudioClock2_Release(IAudioClock2 *iface)
{
    ACImpl *This = impl_from_IAudioClock2(iface);
    return IAudioClient3_Release(&This->IAudioClient3_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->IAudioClient3_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){
            EnterCriticalSection(&g_sessions_lock);
            This->client->session_wrapper = NULL;
            LeaveCriticalSection(&g_sessions_lock);
            AudioClient_Release(&This->client->IAudioClient3_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){
        oss_lock(client->stream);
        if(client->stream->playing){
            *state = AudioSessionStateActive;
            oss_unlock(client->stream);
            LeaveCriticalSection(&g_sessions_lock);
            return S_OK;
        }
        oss_unlock(client->stream);
    }

    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
};

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;
    ACImpl *client;

    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(&g_sessions_lock);

    session->master_vol = level;

    TRACE("OSS doesn't support setting volume\n");
    LIST_FOR_EACH_ENTRY(client, &session->clients, ACImpl, entry)
        set_stream_volumes(client);

    LeaveCriticalSection(&g_sessions_lock);

    return S_OK;
}

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;
    ACImpl *client;

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

    EnterCriticalSection(&g_sessions_lock);

    session->mute = mute;

    LIST_FOR_EACH_ENTRY(client, &session->clients, ACImpl, entry)
        set_stream_volumes(client);

    LeaveCriticalSection(&g_sessions_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 = This->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 IAudioClient3_AddRef(&This->IAudioClient3_iface);
}

static ULONG WINAPI AudioStreamVolume_Release(IAudioStreamVolume *iface)
{
    ACImpl *This = impl_from_IAudioStreamVolume(iface);
    return IAudioClient3_Release(&This->IAudioClient3_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->channel_count;

    return S_OK;
}

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

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

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

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

    EnterCriticalSection(&g_sessions_lock);

    This->vols[index] = level;

    TRACE("OSS doesn't support setting volume\n");
    set_stream_volumes(This);

    LeaveCriticalSection(&g_sessions_lock);

    return S_OK;
}

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->channel_count)
        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;

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

    if(!levels)
        return E_POINTER;

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

    EnterCriticalSection(&g_sessions_lock);

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

    TRACE("OSS doesn't support setting volume\n");
    set_stream_volumes(This);

    LeaveCriticalSection(&g_sessions_lock);

    return S_OK;
}

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->channel_count)
        return E_INVALIDARG;

    EnterCriticalSection(&g_sessions_lock);

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

    LeaveCriticalSection(&g_sessions_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;
    ACImpl *client;

    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(&g_sessions_lock);

    session->channel_vols[index] = level;

    TRACE("OSS doesn't support setting volume\n");
    LIST_FOR_EACH_ENTRY(client, &session->clients, ACImpl, entry)
        set_stream_volumes(client);

    LeaveCriticalSection(&g_sessions_lock);

    return S_OK;
}

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;
    ACImpl *client;
    int i;

    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(&g_sessions_lock);

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

    TRACE("OSS doesn't support setting volume\n");
    LIST_FOR_EACH_ENTRY(client, &session->clients, ACImpl, entry)
        set_stream_volumes(client);

    LeaveCriticalSection(&g_sessions_lock);

    return S_OK;
}

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;
}