Added aRts driver.

[wine.git] / dlls / winmm / winearts / audio.c

/* -*- tab-width: 8; c-basic-offset: 4 -*- */
/*                                 
 * Wine Driver for aRts Sound Server
 *   http://www.arts-project.org
 *
 * Copyright 1994 Martin Ayotte
 *           1999 Eric Pouech (async playing in waveOut/waveIn)
 *           2000 Eric Pouech (loops in waveOut)
 *           2002 Chris Morgan (aRts version of this file)
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
/*
 * FIXME:
 *      pause in waveOut does not work correctly in loop mode
 *
 * TODO:
 *      implement wave-in support with artsc
 *      only one sound card is currently supported, add more
 */

/*#define EMULATE_SB16*/

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "windef.h"
#include "wingdi.h"
#include "winerror.h"
#include "wine/winuser16.h"
#include "mmddk.h"
#include "dsound.h"
#include "dsdriver.h"
#include "arts.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(wave);

/* Allow 1% deviation for sample rates (some ES137x cards) */
#define NEAR_MATCH(rate1,rate2) (((100*((int)(rate1)-(int)(rate2)))/(rate1))==0)

#ifdef HAVE_ARTS

#include <artsc.h>

#define BUFFER_SIZE             16 * 1024
#define SPACE_THRESHOLD         5 * 1024

#define MAX_WAVEOUTDRV  (1)

/* state diagram for waveOut writing:
 *
 * +---------+-------------+---------------+---------------------------------+
 * |  state  |  function   |     event     |            new state            |
 * +---------+-------------+---------------+---------------------------------+
 * |         | open()      |               | STOPPED                         |
 * | PAUSED  | write()     |               | PAUSED                          |
 * | STOPPED | write()     | <thrd create> | PLAYING                         |
 * | PLAYING | write()     | HEADER        | PLAYING                         |
 * | (other) | write()     | <error>       |                                 |
 * | (any)   | pause()     | PAUSING       | PAUSED                          |
 * | PAUSED  | restart()   | RESTARTING    | PLAYING (if no thrd => STOPPED) |
 * | (any)   | reset()     | RESETTING     | STOPPED                         |
 * | (any)   | close()     | CLOSING       | CLOSED                          |
 * +---------+-------------+---------------+---------------------------------+
 */

/* states of the playing device */
#define WINE_WS_PLAYING         0
#define WINE_WS_PAUSED          1
#define WINE_WS_STOPPED         2
#define WINE_WS_CLOSED          3

/* events to be send to device */
enum win_wm_message {
    WINE_WM_PAUSING = WM_USER + 1, WINE_WM_RESTARTING, WINE_WM_RESETTING, WINE_WM_HEADER,
    WINE_WM_UPDATE, WINE_WM_BREAKLOOP, WINE_WM_CLOSING
};

typedef struct {
    enum win_wm_message         msg;    /* message identifier */
    DWORD                       param;  /* parameter for this message */
    HANDLE                      hEvent; /* if message is synchronous, handle of event for synchro */
} RING_MSG;

/* implement an in-process message ring for better performance 
 * (compared to passing thru the server)
 * this ring will be used by the input (resp output) record (resp playback) routine
 */
typedef struct {
#define ARTS_RING_BUFFER_SIZE   30
    RING_MSG                    messages[ARTS_RING_BUFFER_SIZE];
    int                         msg_tosave;
    int                         msg_toget;
    HANDLE                      msg_event;
    CRITICAL_SECTION            msg_crst;
} ARTS_MSG_RING;

typedef struct {
    volatile int                state;                  /* one of the WINE_WS_ manifest constants */
    WAVEOPENDESC                waveDesc;
    WORD                        wFlags;
    PCMWAVEFORMAT               format;
    WAVEOUTCAPSA                caps;

    /* arts information */
    arts_stream_t               play_stream;            /* the stream structure we get from arts when opening a stream for playing */
    DWORD                       dwBufferSize;           /* size of whole buffer in bytes */

    char*                       sound_buffer;
    long                        buffer_size;


    DWORD                       volume_left;            /* volume control information */
    DWORD                       volume_right;

    LPWAVEHDR                   lpQueuePtr;             /* start of queued WAVEHDRs (waiting to be notified) */
    LPWAVEHDR                   lpPlayPtr;              /* start of not yet fully played buffers */
    DWORD                       dwPartialOffset;        /* Offset of not yet written bytes in lpPlayPtr */

    LPWAVEHDR                   lpLoopPtr;              /* pointer of first buffer in loop, if any */
    DWORD                       dwLoops;                /* private copy of loop counter */
    
    DWORD                       dwPlayedTotal;          /* number of bytes actually played since opening */
    DWORD                       dwWrittenTotal;         /* number of bytes written to the audio device since opening */

    /* synchronization stuff */
    HANDLE                      hStartUpEvent;
    HANDLE                      hThread;
    DWORD                       dwThreadID;
    ARTS_MSG_RING               msgRing;
} WINE_WAVEOUT;

static WINE_WAVEOUT     WOutDev   [MAX_WAVEOUTDRV];

static DWORD wodDsCreate(UINT wDevID, PIDSDRIVER* drv);
 
/* These strings used only for tracing */
static const char *wodPlayerCmdString[] = {
    "WINE_WM_PAUSING",
    "WINE_WM_RESTARTING",
    "WINE_WM_RESETTING",
    "WINE_WM_HEADER",
    "WINE_WM_UPDATE",
    "WINE_WM_BREAKLOOP",
    "WINE_WM_CLOSING",
};

/*======================================================================*
 *                  Low level WAVE implementation                       *
 *======================================================================*/

/* Volume functions derived from Alsaplayer source */
/* length is the number of 16 bit samples */
void volume_effect16(void *bufin, void* bufout, int length, int left,
                int right, int  nChannels)
{
  short *d_out = (short *)bufout;
  short *d_in = (short *)bufin;
  int i, v;

/*
  TRACE("length == %d, nChannels == %d\n", length, nChannels);
*/

  if (right == -1) right = left;
                 
  for(i = 0; i < length; i+=(nChannels))
  {
    v = (int) ((*(d_in++) * left) / 100);
    *(d_out++) = (v>32767) ? 32767 : ((v<-32768) ? -32768 : v);
    if(nChannels == 2)
    {
      v = (int) ((*(d_in++) * right) / 100);
      *(d_out++) = (v>32767) ? 32767 : ((v<-32768) ? -32768 : v);
    }
  }
}

/* length is the number of 8 bit samples */
void volume_effect8(void *bufin, void* bufout, int length, int left,
                int right, int  nChannels)
{
  char *d_out = (char *)bufout;
  char *d_in = (char *)bufin;
  int i, v;

/*
  TRACE("length == %d, nChannels == %d\n", length, nChannels);
*/
                        
  if (right == -1) right = left;
                 
  for(i = 0; i < length; i+=(nChannels))
  {
    v = (char) ((*(d_in++) * left) / 100);
    *(d_out++) = (v>127) ? 127 : ((v<-128) ? -128 : v);
    if(nChannels == 2)
    {
      v = (char) ((*(d_in++) * right) / 100);
      *(d_out++) = (v>127) ? 127 : ((v<-128) ? -128 : v);
    }
  }
}

/******************************************************************
 *              ARTS_OpenDevice
 */
static int      ARTS_OpenDevice(void)
{
  return arts_init();  /* initialize arts and return errorcode */
}

/******************************************************************
 *              ARTS_CloseDevice
 *
 */
LONG    ARTS_CloseDevice(void)
{
    arts_free();    /* free up arts */
    return 1;
}

/******************************************************************
 *              ARTS_WaveInit
 *
 * Initialize internal structures from ARTS server info
 */
LONG ARTS_WaveInit(void)
{
    int         i;
    int         errorcode;

    TRACE("called\n");
    
    /* start with output device */

    /* initialize all device handles to -1 */
    for (i = 0; i < MAX_WAVEOUTDRV; ++i)
        WOutDev[i].play_stream = (arts_stream_t*)-1;

    /* FIXME: only one device is supported */
    memset(&WOutDev[0].caps, 0, sizeof(WOutDev[0].caps));

    if ((errorcode = ARTS_OpenDevice()) < 0)
    {
        ERR("arts_init() failed (%d)\n", errorcode);
         return -1;
    }

    /* FIXME: some programs compare this string against the content of the registry
     * for MM drivers. The names have to match in order for the program to work 
     * (e.g. MS win9x mplayer.exe)
     */
#ifdef EMULATE_SB16
    WOutDev[0].caps.wMid = 0x0002;
    WOutDev[0].caps.wPid = 0x0104;
    strcpy(WOutDev[0].caps.szPname, "SB16 Wave Out");
#else
    WOutDev[0].caps.wMid = 0x00FF;      /* Manufac ID */
    WOutDev[0].caps.wPid = 0x0001;      /* Product ID */
    /*    strcpy(WOutDev[0].caps.szPname, "OpenSoundSystem WAVOUT Driver");*/
    strcpy(WOutDev[0].caps.szPname, "CS4236/37/38");
#endif
    WOutDev[0].caps.vDriverVersion = 0x0100;
    WOutDev[0].caps.dwFormats = 0x00000000;
    WOutDev[0].caps.dwSupport = WAVECAPS_VOLUME;
    
    WOutDev[0].caps.wChannels = 2;
    WOutDev[0].caps.dwSupport |= WAVECAPS_LRVOLUME;

    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_4M08;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_4S08;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_4S16;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_4M16;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_2M08;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_2S08;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_2M16;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_2S16;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_1M08;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_1S08;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_1M16;
    WOutDev[0].caps.dwFormats |= WAVE_FORMAT_1S16;

    return 0;
}

/******************************************************************
 *              ARTS_InitRingMessage
 *
 * Initialize the ring of messages for passing between driver's caller and playback/record
 * thread
 */
static int ARTS_InitRingMessage(ARTS_MSG_RING* mr)
{
    mr->msg_toget = 0;
    mr->msg_tosave = 0;
    mr->msg_event = CreateEventA(NULL, FALSE, FALSE, NULL);
    memset(mr->messages, 0, sizeof(RING_MSG) * ARTS_RING_BUFFER_SIZE);
    InitializeCriticalSection(&mr->msg_crst);
    return 0;
}

/******************************************************************
 *              ARTS_DestroyRingMessage
 *
 */
static int ARTS_DestroyRingMessage(ARTS_MSG_RING* mr)
{
    CloseHandle(mr->msg_event);
    DeleteCriticalSection(&mr->msg_crst);
    return 0;
}

/******************************************************************
 *              ARTS_AddRingMessage
 *
 * Inserts a new message into the ring (should be called from DriverProc derivated routines)
 */
static int ARTS_AddRingMessage(ARTS_MSG_RING* mr, enum win_wm_message msg, DWORD param, BOOL wait)
{
    HANDLE      hEvent = INVALID_HANDLE_VALUE;
        
    EnterCriticalSection(&mr->msg_crst);
    if ((mr->msg_toget == ((mr->msg_tosave + 1) % ARTS_RING_BUFFER_SIZE))) /* buffer overflow? */
    {
        ERR("buffer overflow !?\n");
        LeaveCriticalSection(&mr->msg_crst);
        return 0;
    }
    if (wait)
    {
        hEvent = CreateEventA(NULL, FALSE, FALSE, NULL);
        if (hEvent == INVALID_HANDLE_VALUE)
        {
            ERR("can't create event !?\n");
            LeaveCriticalSection(&mr->msg_crst);
            return 0;
        }
        if (mr->msg_toget != mr->msg_tosave && mr->messages[mr->msg_toget].msg != WINE_WM_HEADER)
            FIXME("two fast messages in the queue!!!!\n");
     
        /* fast messages have to be added at the start of the queue */
        mr->msg_toget = (mr->msg_toget + ARTS_RING_BUFFER_SIZE - 1) % ARTS_RING_BUFFER_SIZE;

        mr->messages[mr->msg_toget].msg = msg;
        mr->messages[mr->msg_toget].param = param;
        mr->messages[mr->msg_toget].hEvent = hEvent;
    }
    else
    {
        mr->messages[mr->msg_tosave].msg = msg;
        mr->messages[mr->msg_tosave].param = param;
        mr->messages[mr->msg_tosave].hEvent = INVALID_HANDLE_VALUE;
        mr->msg_tosave = (mr->msg_tosave + 1) % ARTS_RING_BUFFER_SIZE;
    }

    LeaveCriticalSection(&mr->msg_crst);

    SetEvent(mr->msg_event);    /* signal a new message */

    if (wait)
    {
        /* wait for playback/record thread to have processed the message */
        WaitForSingleObject(hEvent, INFINITE);
        CloseHandle(hEvent);
    }

    return 1;
}

/******************************************************************
 *              ARTS_RetrieveRingMessage
 *
 * Get a message from the ring. Should be called by the playback/record thread.
 */
static int ARTS_RetrieveRingMessage(ARTS_MSG_RING* mr, 
                                   enum win_wm_message *msg, DWORD *param, HANDLE *hEvent)
{
    EnterCriticalSection(&mr->msg_crst);

    if (mr->msg_toget == mr->msg_tosave) /* buffer empty ? */
    {
        LeaveCriticalSection(&mr->msg_crst);
        return 0;
    }
        
    *msg = mr->messages[mr->msg_toget].msg;
    mr->messages[mr->msg_toget].msg = 0;
    *param = mr->messages[mr->msg_toget].param;
    *hEvent = mr->messages[mr->msg_toget].hEvent;
    mr->msg_toget = (mr->msg_toget + 1) % ARTS_RING_BUFFER_SIZE;
    LeaveCriticalSection(&mr->msg_crst);
    return 1;
}

/*======================================================================*
 *                  Low level WAVE OUT implementation                   *
 *======================================================================*/

/**************************************************************************
 *                      wodNotifyClient                 [internal]
 */
static DWORD wodNotifyClient(WINE_WAVEOUT* wwo, WORD wMsg, DWORD dwParam1, DWORD dwParam2)
{
    TRACE("wMsg = 0x%04x dwParm1 = %04lX dwParam2 = %04lX\n", wMsg, dwParam1, dwParam2);
    
    switch (wMsg) {
    case WOM_OPEN:
    case WOM_CLOSE:
    case WOM_DONE:
        if (wwo->wFlags != DCB_NULL && 
            !DriverCallback(wwo->waveDesc.dwCallback, wwo->wFlags, wwo->waveDesc.hWave, 
                            wMsg, wwo->waveDesc.dwInstance, dwParam1, dwParam2)) {
            WARN("can't notify client !\n");
            return MMSYSERR_ERROR;
        }
        break;
    default:
        FIXME("Unknown callback message %u\n", wMsg);
        return MMSYSERR_INVALPARAM;
    }
    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                              wodUpdatePlayedTotal    [internal]
 *
 */
static BOOL wodUpdatePlayedTotal(WINE_WAVEOUT* wwo)
{
    /* total played is the bytes written less the bytes to write ;-) */
    wwo->dwPlayedTotal = wwo->dwWrittenTotal - 
        (wwo->dwBufferSize - 
        arts_stream_get(wwo->play_stream, ARTS_P_BUFFER_SPACE));
    return TRUE;
}

/**************************************************************************
 *                              wodPlayer_BeginWaveHdr          [internal]
 *
 * Makes the specified lpWaveHdr the currently playing wave header.
 * If the specified wave header is a begin loop and we're not already in
 * a loop, setup the loop.
 */
static void wodPlayer_BeginWaveHdr(WINE_WAVEOUT* wwo, LPWAVEHDR lpWaveHdr)
{
    wwo->lpPlayPtr = lpWaveHdr;

    if (!lpWaveHdr) return;

    if (lpWaveHdr->dwFlags & WHDR_BEGINLOOP) {
        if (wwo->lpLoopPtr) {
            WARN("Already in a loop. Discarding loop on this header (%p)\n", lpWaveHdr);
            TRACE("Already in a loop. Discarding loop on this header (%p)\n", lpWaveHdr);
        } else {
            TRACE("Starting loop (%ldx) with %p\n", lpWaveHdr->dwLoops, lpWaveHdr);
            wwo->lpLoopPtr = lpWaveHdr;
            /* Windows does not touch WAVEHDR.dwLoops,
             * so we need to make an internal copy */
            wwo->dwLoops = lpWaveHdr->dwLoops;
        }
    }
    wwo->dwPartialOffset = 0;
}

/**************************************************************************
 *                              wodPlayer_PlayPtrNext           [internal]
 *
 * Advance the play pointer to the next waveheader, looping if required.
 */
static LPWAVEHDR wodPlayer_PlayPtrNext(WINE_WAVEOUT* wwo)
{
    LPWAVEHDR lpWaveHdr = wwo->lpPlayPtr;

    wwo->dwPartialOffset = 0;
    if ((lpWaveHdr->dwFlags & WHDR_ENDLOOP) && wwo->lpLoopPtr) {
        /* We're at the end of a loop, loop if required */
        if (--wwo->dwLoops > 0) {
            wwo->lpPlayPtr = wwo->lpLoopPtr;
        } else {
            /* Handle overlapping loops correctly */
            if (wwo->lpLoopPtr != lpWaveHdr && (lpWaveHdr->dwFlags & WHDR_BEGINLOOP)) {
                FIXME("Correctly handled case ? (ending loop buffer also starts a new loop)\n");
                /* shall we consider the END flag for the closing loop or for
                 * the opening one or for both ???
                 * code assumes for closing loop only
                 */
            } else {
                lpWaveHdr = lpWaveHdr->lpNext;
            }
            wwo->lpLoopPtr = NULL;
            wodPlayer_BeginWaveHdr(wwo, lpWaveHdr);
        }
    } else {
        /* We're not in a loop.  Advance to the next wave header */
        wodPlayer_BeginWaveHdr(wwo, lpWaveHdr = lpWaveHdr->lpNext);
    }

    return lpWaveHdr;
}

/**************************************************************************
 *                           wodPlayer_DSPWait                  [internal]
 * Returns the number of milliseconds to wait for the DSP buffer to clear.
 * This is based on the number of fragments we want to be clear before
 * writing and the number of free fragments we already have.
 */
static DWORD wodPlayer_DSPWait(const WINE_WAVEOUT *wwo)
{
        int waitvalue = (wwo->dwBufferSize - arts_stream_get(wwo->play_stream, 
                ARTS_P_BUFFER_SPACE)) / ((wwo->format.wf.nSamplesPerSec * 
                wwo->format.wBitsPerSample * wwo->format.wf.nChannels) 
                /1000);

        /* FIXME: this is a hack since the waitvalue we calculate is too 
large for some reason.... */
        waitvalue/=4;

        TRACE("wait value of %d\n", waitvalue);

        /* return the time left to play the buffer */
        return waitvalue;
}

/**************************************************************************
 *                           wodPlayer_NotifyWait               [internal]
 * Returns the number of milliseconds to wait before attempting to notify
 * completion of the specified wavehdr.
 * This is based on the number of bytes remaining to be written in the
 * wave.
 */
static DWORD wodPlayer_NotifyWait(const WINE_WAVEOUT* wwo, LPWAVEHDR lpWaveHdr)
{
    DWORD dwMillis;    

    if(lpWaveHdr->reserved < wwo->dwPlayedTotal)
    {
        dwMillis = 1;
    }
    else
    {
        dwMillis = (lpWaveHdr->reserved - wwo->dwPlayedTotal) * 1000 / wwo->format.wf.nAvgBytesPerSec;
        if(!dwMillis) dwMillis = 1;
    }

    TRACE("dwMillis = %ld\n", dwMillis);

    return dwMillis;
}


/**************************************************************************
 *                           wodPlayer_WriteMaxFrags            [internal]
 * Writes the maximum number of bytes possible to the DSP and returns
 * the number of bytes written.
 */
static int wodPlayer_WriteMaxFrags(WINE_WAVEOUT* wwo, DWORD* bytes)
{
    /* Only attempt to write to free bytes */
    DWORD dwLength = wwo->lpPlayPtr->dwBufferLength - wwo->dwPartialOffset;
    int toWrite = min(dwLength, *bytes);
    int written;

    TRACE("Writing wavehdr %p.%lu[%lu]\n", 
          wwo->lpPlayPtr, wwo->dwPartialOffset, wwo->lpPlayPtr->dwBufferLength);

    /* see if our buffer isn't large enough for the data we are writing */
    if(wwo->buffer_size < toWrite)
    {
      if(wwo->sound_buffer)
        HeapFree(GetProcessHeap(), 0, wwo->sound_buffer);
    }

    /* if we don't have a buffer then get one */
    if(!wwo->sound_buffer)
    {
      /* allocate some memory for the buffer */
      wwo->sound_buffer = HeapAlloc(GetProcessHeap(), 0, toWrite);
      wwo->buffer_size = toWrite;
    }

    /* if we don't have a buffer then error out */
    if(!wwo->sound_buffer)
    {
      ERR("error allocating sound_buffer memory\n");
      return 0;
    }

    TRACE("toWrite == %d\n", toWrite);

    /* apply volume to the bits */
    /* for single channel audio streams we only use the LEFT volume */
    if(wwo->format.wBitsPerSample == 16)
    {
      /* apply volume to the buffer we are about to send */
      /* divide toWrite(bytes) by 2 as volume processes by 16 bits */
      volume_effect16(wwo->lpPlayPtr->lpData + wwo->dwPartialOffset, 
                wwo->sound_buffer, toWrite>>1, wwo->volume_left, 
                wwo->volume_right, wwo->format.wf.nChannels);
    } else if(wwo->format.wBitsPerSample == 8)
    {
      /* apply volume to the buffer we are about to send */
      volume_effect8(wwo->lpPlayPtr->lpData + wwo->dwPartialOffset, 
                wwo->sound_buffer, toWrite>>1, wwo->volume_left, 
                wwo->volume_right, wwo->format.wf.nChannels);
    } else
    {
      FIXME("unsupported wwo->format.wBitsPerSample of %d\n", 
        wwo->format.wBitsPerSample);
    }

    /* send the audio data to arts for playing */
    written = arts_write(wwo->play_stream, wwo->sound_buffer, toWrite);

    TRACE("written = %d\n", written);

    if (written <= 0) return written; /* if we wrote nothing just return */

    if (written >= dwLength)
        wodPlayer_PlayPtrNext(wwo);   /* If we wrote all current wavehdr, skip to the next one */
    else
        wwo->dwPartialOffset += written;    /* Remove the amount written */

    *bytes -= written;
    wwo->dwWrittenTotal += written; /* update stats on this wave device */

    return written; /* return the number of bytes written */
}


/**************************************************************************
 *                              wodPlayer_NotifyCompletions     [internal]
 *
 * Notifies and remove from queue all wavehdrs which have been played to
 * the speaker (ie. they have cleared the audio device).  If force is true,
 * we notify all wavehdrs and remove them all from the queue even if they
 * are unplayed or part of a loop.
 */
static DWORD wodPlayer_NotifyCompletions(WINE_WAVEOUT* wwo, BOOL force)
{
    LPWAVEHDR           lpWaveHdr;

    /* Start from lpQueuePtr and keep notifying until:
     * - we hit an unwritten wavehdr
     * - we hit the beginning of a running loop
     * - we hit a wavehdr which hasn't finished playing
     */
    while ((lpWaveHdr = wwo->lpQueuePtr) && 
           (force || 
            (lpWaveHdr != wwo->lpPlayPtr &&
             lpWaveHdr != wwo->lpLoopPtr &&
             lpWaveHdr->reserved <= wwo->dwPlayedTotal))) {

        wwo->lpQueuePtr = lpWaveHdr->lpNext;

        lpWaveHdr->dwFlags &= ~WHDR_INQUEUE;
        lpWaveHdr->dwFlags |= WHDR_DONE;

        wodNotifyClient(wwo, WOM_DONE, (DWORD)lpWaveHdr, 0);
    }
    return  (lpWaveHdr && lpWaveHdr != wwo->lpPlayPtr && lpWaveHdr != wwo->lpLoopPtr) ? 
        wodPlayer_NotifyWait(wwo, lpWaveHdr) : INFINITE;
}

/**************************************************************************
 *                              wodPlayer_Reset                 [internal]
 *
 * wodPlayer helper. Resets current output stream.
 */
static  void    wodPlayer_Reset(WINE_WAVEOUT* wwo, BOOL reset)
{
    wodUpdatePlayedTotal(wwo);

    /* updates current notify list */
    wodPlayer_NotifyCompletions(wwo, FALSE);

    /* flush all possible output */
    /* close and open the stream to end the playback and prepare for 
                new playback */
    arts_close_stream(wwo->play_stream);
    wwo->play_stream = arts_play_stream(wwo->format.wf.nSamplesPerSec, 
        wwo->format.wBitsPerSample, wwo->format.wf.nChannels, "winearts");

    if (reset) {
        enum win_wm_message     msg;
        DWORD                   param;
        HANDLE                  ev;

        /* remove any buffer */
        wodPlayer_NotifyCompletions(wwo, TRUE);

        wwo->lpPlayPtr = wwo->lpQueuePtr = wwo->lpLoopPtr = NULL;
        wwo->state = WINE_WS_STOPPED;
        wwo->dwPlayedTotal = wwo->dwWrittenTotal = 0;

        wwo->dwPartialOffset = 0;        /* Clear partial wavehdr */

        /* remove any existing message in the ring */
        EnterCriticalSection(&wwo->msgRing.msg_crst);

        /* return all pending headers in queue */
        while (ARTS_RetrieveRingMessage(&wwo->msgRing, &msg, &param, &ev))
        {
            TRACE("flushing msg\n");
            if (msg != WINE_WM_HEADER)
            {
                FIXME("shouldn't have headers left\n");
                SetEvent(ev);
                continue;
            }
            ((LPWAVEHDR)param)->dwFlags &= ~WHDR_INQUEUE;
            ((LPWAVEHDR)param)->dwFlags |= WHDR_DONE;
        
            wodNotifyClient(wwo, WOM_DONE, param, 0);
        }
        ResetEvent(wwo->msgRing.msg_event);
        LeaveCriticalSection(&wwo->msgRing.msg_crst);  
    } else {
        if (wwo->lpLoopPtr) {
            /* complicated case, not handled yet (could imply modifying the loop counter */
            FIXME("Pausing while in loop isn't correctly handled yet, except strange results\n");
            wwo->lpPlayPtr = wwo->lpLoopPtr;
            wwo->dwPartialOffset = 0;
            wwo->dwWrittenTotal = wwo->dwPlayedTotal; /* this is wrong !!! */
        } else {
            LPWAVEHDR   ptr;
            DWORD       sz = wwo->dwPartialOffset;

            /* reset all the data as if we had written only up to lpPlayedTotal bytes */
            /* compute the max size playable from lpQueuePtr */
            for (ptr = wwo->lpQueuePtr; ptr != wwo->lpPlayPtr; ptr = ptr->lpNext) {
                sz += ptr->dwBufferLength;
            }
            /* because the reset lpPlayPtr will be lpQueuePtr */
            if (wwo->dwWrittenTotal > wwo->dwPlayedTotal + sz) ERR("grin\n");
            wwo->dwPartialOffset = sz - (wwo->dwWrittenTotal - wwo->dwPlayedTotal);
            wwo->dwWrittenTotal = wwo->dwPlayedTotal;
            wwo->lpPlayPtr = wwo->lpQueuePtr;
        }
        wwo->state = WINE_WS_PAUSED;
    }
}

/**************************************************************************
 *                    wodPlayer_ProcessMessages                 [internal]
 */
static void wodPlayer_ProcessMessages(WINE_WAVEOUT* wwo)
{
    LPWAVEHDR           lpWaveHdr;
    enum win_wm_message msg;
    DWORD               param;
    HANDLE              ev;

    while (ARTS_RetrieveRingMessage(&wwo->msgRing, &msg, &param, &ev)) {
        TRACE("Received %s %lx\n", wodPlayerCmdString[msg - WM_USER - 1], param);
        switch (msg) {
        case WINE_WM_PAUSING:
            wodPlayer_Reset(wwo, FALSE);
            SetEvent(ev);
            break;
        case WINE_WM_RESTARTING:
            wwo->state = WINE_WS_PLAYING;
            SetEvent(ev);
            break;
        case WINE_WM_HEADER:
            lpWaveHdr = (LPWAVEHDR)param;
            
            /* insert buffer at the end of queue */
            {
                LPWAVEHDR*      wh;
                for (wh = &(wwo->lpQueuePtr); *wh; wh = &((*wh)->lpNext));
                *wh = lpWaveHdr;
            }
            if (!wwo->lpPlayPtr)
                wodPlayer_BeginWaveHdr(wwo,lpWaveHdr);
            if (wwo->state == WINE_WS_STOPPED)
                wwo->state = WINE_WS_PLAYING;
            break;
        case WINE_WM_RESETTING:
            wodPlayer_Reset(wwo, TRUE);
            SetEvent(ev);
            break;
        case WINE_WM_UPDATE:
            wodUpdatePlayedTotal(wwo);
            SetEvent(ev);
            break;
        case WINE_WM_BREAKLOOP:
            if (wwo->state == WINE_WS_PLAYING && wwo->lpLoopPtr != NULL) {
                /* ensure exit at end of current loop */
                wwo->dwLoops = 1;
            }
            SetEvent(ev);
            break;
        case WINE_WM_CLOSING:
            /* sanity check: this should not happen since the device must have been reset before */
            if (wwo->lpQueuePtr || wwo->lpPlayPtr) ERR("out of sync\n");
            wwo->hThread = 0;
            wwo->state = WINE_WS_CLOSED;
            SetEvent(ev);
            ExitThread(0);
            /* shouldn't go here */
        default:
            FIXME("unknown message %d\n", msg);
            break;
        }
    }
}

/**************************************************************************
 *                           wodPlayer_FeedDSP                  [internal]
 * Feed as much sound data as we can into the DSP and return the number of
 * milliseconds before it will be necessary to feed the DSP again.
 */
static DWORD wodPlayer_FeedDSP(WINE_WAVEOUT* wwo)
{
    DWORD       availInQ;

    wodUpdatePlayedTotal(wwo);
    availInQ = arts_stream_get(wwo->play_stream, ARTS_P_BUFFER_SPACE);
    TRACE("availInQ = %ld\n", availInQ);

    /* input queue empty and output buffer with no space */
    if (!wwo->lpPlayPtr && availInQ) {
        TRACE("Run out of wavehdr:s... flushing\n");
        wwo->dwPlayedTotal = wwo->dwWrittenTotal;
        return INFINITE;
    }

    /* no more room... no need to try to feed */
    if(!availInQ)
    {
        TRACE("no more room, no need to try to feed\n");
        return wodPlayer_DSPWait(wwo);
    }

    /* Feed from partial wavehdr */
    if (wwo->lpPlayPtr && wwo->dwPartialOffset != 0)
    {
        TRACE("feeding from partial wavehdr\n");
        wodPlayer_WriteMaxFrags(wwo, &availInQ);
    }

    /* Feed wavehdrs until we run out of wavehdrs or DSP space */
    if (!wwo->dwPartialOffset)
    {
         while(wwo->lpPlayPtr && availInQ > SPACE_THRESHOLD)
         {
                TRACE("feeding waveheaders until we run out of space\n");
                /* note the value that dwPlayedTotal will return when this wave finishes playing */
                wwo->lpPlayPtr->reserved = wwo->dwWrittenTotal + wwo->lpPlayPtr->dwBufferLength;
                wodPlayer_WriteMaxFrags(wwo, &availInQ);
            }
    }

    return wodPlayer_DSPWait(wwo);
}


/**************************************************************************
 *                              wodPlayer                       [internal]
 */
static  DWORD   CALLBACK        wodPlayer(LPVOID pmt)
{
    WORD          uDevID = (DWORD)pmt;
    WINE_WAVEOUT* wwo = (WINE_WAVEOUT*)&WOutDev[uDevID];
    DWORD         dwNextFeedTime = INFINITE;   /* Time before DSP needs feeding */
    DWORD         dwNextNotifyTime = INFINITE; /* Time before next wave completion */
    DWORD         dwSleepTime;

    wwo->state = WINE_WS_STOPPED;
    SetEvent(wwo->hStartUpEvent);

    for (;;) {
        /** Wait for the shortest time before an action is required.  If there
         *  are no pending actions, wait forever for a command.
         */
        dwSleepTime = min(dwNextFeedTime, dwNextNotifyTime);
        TRACE("waiting %lums (%lu,%lu)\n", dwSleepTime, dwNextFeedTime, dwNextNotifyTime);
        WaitForSingleObject(wwo->msgRing.msg_event, dwSleepTime);
        wodPlayer_ProcessMessages(wwo);
        if (wwo->state == WINE_WS_PLAYING) {
            dwNextFeedTime = wodPlayer_FeedDSP(wwo);
            dwNextNotifyTime = wodPlayer_NotifyCompletions(wwo, FALSE);
        } else {
            dwNextFeedTime = dwNextNotifyTime = INFINITE;
        }
    }
}

/**************************************************************************
 *                      wodGetDevCaps                           [internal]
 */
static DWORD wodGetDevCaps(WORD wDevID, LPWAVEOUTCAPSA lpCaps, DWORD dwSize)
{
    TRACE("(%u, %p, %lu);\n", wDevID, lpCaps, dwSize);
    
    if (lpCaps == NULL) return MMSYSERR_NOTENABLED;
    
    if (wDevID >= MAX_WAVEOUTDRV) {
        TRACE("MAX_WAVOUTDRV reached !\n");
        return MMSYSERR_BADDEVICEID;
    }

    memcpy(lpCaps, &WOutDev[wDevID].caps, min(dwSize, sizeof(*lpCaps)));
    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                              wodOpen                         [internal]
 */
static DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
{
    WINE_WAVEOUT*       wwo;

    TRACE("(%u, %p, %08lX);\n", wDevID, lpDesc, dwFlags);
    if (lpDesc == NULL) {
        WARN("Invalid Parameter !\n");
        return MMSYSERR_INVALPARAM;
    }
    if (wDevID >= MAX_WAVEOUTDRV) {
        TRACE("MAX_WAVOUTDRV reached !\n");
        return MMSYSERR_BADDEVICEID;
    }

    /* only PCM format is supported so far... */
    if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
        lpDesc->lpFormat->nChannels == 0 ||
        lpDesc->lpFormat->nSamplesPerSec == 0) {
        WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n", 
             lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
             lpDesc->lpFormat->nSamplesPerSec);
        return WAVERR_BADFORMAT;
    }

    if (dwFlags & WAVE_FORMAT_QUERY) {
        TRACE("Query format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n", 
             lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
             lpDesc->lpFormat->nSamplesPerSec);
        return MMSYSERR_NOERROR;
    }

    wwo = &WOutDev[wDevID];

    /* direct sound not supported, ignore the flag */
    dwFlags &= ~WAVE_DIRECTSOUND;

    wwo->wFlags = HIWORD(dwFlags & CALLBACK_TYPEMASK);
    
    memcpy(&wwo->waveDesc, lpDesc,           sizeof(WAVEOPENDESC));
    memcpy(&wwo->format,   lpDesc->lpFormat, sizeof(PCMWAVEFORMAT));
    
    if (wwo->format.wBitsPerSample == 0) {
        WARN("Resetting zeroed wBitsPerSample\n");
        wwo->format.wBitsPerSample = 8 *
            (wwo->format.wf.nAvgBytesPerSec /
             wwo->format.wf.nSamplesPerSec) /
            wwo->format.wf.nChannels;
    }

    wwo->play_stream = arts_play_stream(wwo->format.wf.nSamplesPerSec, 
        wwo->format.wBitsPerSample, wwo->format.wf.nChannels, "winearts");

    /* clear these so we don't have any confusion ;-) */
    wwo->sound_buffer = 0;
    wwo->buffer_size = 0;

    arts_stream_set(wwo->play_stream, ARTS_P_BLOCKING, 0);    /* disable blocking on this stream */

    if(!wwo->play_stream) return MMSYSERR_ALLOCATED;

    /* Try to set buffer size from constant and store the value that it 
        was set to for future use */
    wwo->dwBufferSize = arts_stream_set(wwo->play_stream, 
                ARTS_P_BUFFER_SIZE, BUFFER_SIZE);
    TRACE("Tried to set BUFFER_SIZE of %d, wwo->dwBufferSize is actually 
        %ld\n", BUFFER_SIZE, wwo->dwBufferSize);
    wwo->dwPlayedTotal = 0;
    wwo->dwWrittenTotal = 0;

    ARTS_InitRingMessage(&wwo->msgRing);

    /* create player thread */
    if (!(dwFlags & WAVE_DIRECTSOUND)) {
        wwo->hStartUpEvent = CreateEventA(NULL, FALSE, FALSE, NULL);
        wwo->hThread = CreateThread(NULL, 0, wodPlayer, (LPVOID)(DWORD)wDevID, 0, &(wwo->dwThreadID));
        WaitForSingleObject(wwo->hStartUpEvent, INFINITE);
        CloseHandle(wwo->hStartUpEvent);
    } else {
        wwo->hThread = INVALID_HANDLE_VALUE;
        wwo->dwThreadID = 0;
    }
    wwo->hStartUpEvent = INVALID_HANDLE_VALUE;

    TRACE("stream=0x%lx, dwBufferSize=%ld\n", 
          (long)wwo->play_stream, wwo->dwBufferSize);

    TRACE("wBitsPerSample=%u, nAvgBytesPerSec=%lu, nSamplesPerSec=%lu, nChannels=%u nBlockAlign=%u!\n", 
          wwo->format.wBitsPerSample, wwo->format.wf.nAvgBytesPerSec, 
          wwo->format.wf.nSamplesPerSec, wwo->format.wf.nChannels,
          wwo->format.wf.nBlockAlign);
    
    return wodNotifyClient(wwo, WOM_OPEN, 0L, 0L);
}

/**************************************************************************
 *                              wodClose                        [internal]
 */
static DWORD wodClose(WORD wDevID)
{
    DWORD               ret = MMSYSERR_NOERROR;
    WINE_WAVEOUT*       wwo;

    TRACE("(%u);\n", wDevID);
    
    if (wDevID >= MAX_WAVEOUTDRV || WOutDev[wDevID].play_stream  == 
        (arts_stream_t*)-1)
    {
        WARN("bad device ID !\n");
        return MMSYSERR_BADDEVICEID;
    }
    
    wwo = &WOutDev[wDevID];
    if (wwo->lpQueuePtr) {
        WARN("buffers still playing !\n");
        ret = WAVERR_STILLPLAYING;
    } else {
        TRACE("imhere[3-close]\n");
        if (wwo->hThread != INVALID_HANDLE_VALUE) {
            ARTS_AddRingMessage(&wwo->msgRing, WINE_WM_CLOSING, 0, TRUE);
        }

        ARTS_DestroyRingMessage(&wwo->msgRing);

        arts_close_stream(wwo->play_stream);    /* close the arts stream */

        /* free up the buffer we use for volume and reset the size */
        if(wwo->sound_buffer)
                HeapFree(GetProcessHeap(), 0, wwo->sound_buffer);
        wwo->buffer_size = 0;

        wwo->play_stream = (arts_stream_t*)-1;
        ret = wodNotifyClient(wwo, WOM_CLOSE, 0L, 0L);
    }
    return ret;
}

/**************************************************************************
 *                              wodWrite                        [internal]
 * 
 */
static DWORD wodWrite(WORD wDevID, LPWAVEHDR lpWaveHdr, DWORD dwSize)
{
    TRACE("(%u, %p, %08lX);\n", wDevID, lpWaveHdr, dwSize);
    
    /* first, do the sanity checks... */
    if (wDevID >= MAX_WAVEOUTDRV || WOutDev[wDevID].play_stream == 
                (arts_stream_t*)-1)
    {
        WARN("bad dev ID !\n");
        return MMSYSERR_BADDEVICEID;
    }
    
    if (lpWaveHdr->lpData == NULL || !(lpWaveHdr->dwFlags & WHDR_PREPARED)) 
    {
        TRACE("unprepared\n");
        return WAVERR_UNPREPARED;
    }
    
    if (lpWaveHdr->dwFlags & WHDR_INQUEUE) 
    {
        TRACE("still playing\n");
        return WAVERR_STILLPLAYING;
    }

    lpWaveHdr->dwFlags &= ~WHDR_DONE;
    lpWaveHdr->dwFlags |= WHDR_INQUEUE;
    lpWaveHdr->lpNext = 0;

    TRACE("adding ring message\n");
    ARTS_AddRingMessage(&WOutDev[wDevID].msgRing, WINE_WM_HEADER, (DWORD)lpWaveHdr, FALSE);

    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                              wodPrepare                      [internal]
 */
static DWORD wodPrepare(WORD wDevID, LPWAVEHDR lpWaveHdr, DWORD dwSize)
{
    TRACE("(%u, %p, %08lX);\n", wDevID, lpWaveHdr, dwSize);
    
    if (wDevID >= MAX_WAVEOUTDRV) {
        WARN("bad device ID !\n");
        return MMSYSERR_BADDEVICEID;
    }
    
    if (lpWaveHdr->dwFlags & WHDR_INQUEUE)
        return WAVERR_STILLPLAYING;
    
    lpWaveHdr->dwFlags |= WHDR_PREPARED;
    lpWaveHdr->dwFlags &= ~WHDR_DONE;
    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                              wodUnprepare                    [internal]
 */
static DWORD wodUnprepare(WORD wDevID, LPWAVEHDR lpWaveHdr, DWORD dwSize)
{
    TRACE("(%u, %p, %08lX);\n", wDevID, lpWaveHdr, dwSize);
    
    if (wDevID >= MAX_WAVEOUTDRV) {
        WARN("bad device ID !\n");
        return MMSYSERR_BADDEVICEID;
    }
    
    if (lpWaveHdr->dwFlags & WHDR_INQUEUE)
        return WAVERR_STILLPLAYING;
    
    lpWaveHdr->dwFlags &= ~WHDR_PREPARED;
    lpWaveHdr->dwFlags |= WHDR_DONE;
    
    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                      wodPause                                [internal]
 */
static DWORD wodPause(WORD wDevID)
{
    TRACE("(%u);!\n", wDevID);
    
    if (wDevID >= MAX_WAVEOUTDRV || WOutDev[wDevID].play_stream == 
                (arts_stream_t*)-1)
    {
        WARN("bad device ID !\n");
        return MMSYSERR_BADDEVICEID;
    }
    
    TRACE("imhere[3-PAUSING]\n");
    ARTS_AddRingMessage(&WOutDev[wDevID].msgRing, WINE_WM_PAUSING, 0, TRUE);
    
    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                      wodRestart                              [internal]
 */
static DWORD wodRestart(WORD wDevID)
{
    TRACE("(%u);\n", wDevID);
    
    if (wDevID >= MAX_WAVEOUTDRV || WOutDev[wDevID].play_stream == 
                (arts_stream_t*)-1)
    {
        WARN("bad device ID !\n");
        return MMSYSERR_BADDEVICEID;
    }
    
    if (WOutDev[wDevID].state == WINE_WS_PAUSED) {
        TRACE("imhere[3-RESTARTING]\n");
        ARTS_AddRingMessage(&WOutDev[wDevID].msgRing, WINE_WM_RESTARTING, 0, TRUE);
    }
    
    /* FIXME: is NotifyClient with WOM_DONE right ? (Comet Busters 1.3.3 needs this notification) */
    /* FIXME: Myst crashes with this ... hmm -MM
       return wodNotifyClient(wwo, WOM_DONE, 0L, 0L);
    */
    
    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                      wodReset                                [internal]
 */
static DWORD wodReset(WORD wDevID)
{
    TRACE("(%u);\n", wDevID);
    
    if (wDevID >= MAX_WAVEOUTDRV || WOutDev[wDevID].play_stream == 
        (arts_stream_t*)-1)
    {
        WARN("bad device ID !\n");
        return MMSYSERR_BADDEVICEID;
    }
    
    TRACE("imhere[3-RESET]\n");
    ARTS_AddRingMessage(&WOutDev[wDevID].msgRing, WINE_WM_RESETTING, 0, TRUE);
    
    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                              wodGetPosition                  [internal]
 */
static DWORD wodGetPosition(WORD wDevID, LPMMTIME lpTime, DWORD uSize)
{
    int                 time;
    DWORD               val;
    WINE_WAVEOUT*       wwo;

    TRACE("(%u, %p, %lu);\n", wDevID, lpTime, uSize);
    
    if (wDevID >= MAX_WAVEOUTDRV || WOutDev[wDevID].play_stream == 
        (arts_stream_t*)-1)
    {
        WARN("bad device ID !\n");
        return MMSYSERR_BADDEVICEID;
    }
    
    if (lpTime == NULL) return MMSYSERR_INVALPARAM;

    wwo = &WOutDev[wDevID];
    ARTS_AddRingMessage(&wwo->msgRing, WINE_WM_UPDATE, 0, TRUE);
    val = wwo->dwPlayedTotal;

    TRACE("wType=%04X wBitsPerSample=%u nSamplesPerSec=%lu nChannels=%u nAvgBytesPerSec=%lu\n", 
          lpTime->wType, wwo->format.wBitsPerSample, 
          wwo->format.wf.nSamplesPerSec, wwo->format.wf.nChannels, 
          wwo->format.wf.nAvgBytesPerSec); 
    TRACE("dwPlayedTotal=%lu\n", val);
    
    switch (lpTime->wType) {
    case TIME_BYTES:
        lpTime->u.cb = val;
        TRACE("TIME_BYTES=%lu\n", lpTime->u.cb);
        break;
    case TIME_SAMPLES:
        lpTime->u.sample = val * 8 / wwo->format.wBitsPerSample /wwo->format.wf.nChannels;
        TRACE("TIME_SAMPLES=%lu\n", lpTime->u.sample);
        break;
    case TIME_SMPTE:
        time = val / (wwo->format.wf.nAvgBytesPerSec / 1000);
        lpTime->u.smpte.hour = time / 108000;
        time -= lpTime->u.smpte.hour * 108000;
        lpTime->u.smpte.min = time / 1800;
        time -= lpTime->u.smpte.min * 1800;
        lpTime->u.smpte.sec = time / 30;
        time -= lpTime->u.smpte.sec * 30;
        lpTime->u.smpte.frame = time;
        lpTime->u.smpte.fps = 30;
        TRACE("TIME_SMPTE=%02u:%02u:%02u:%02u\n",
              lpTime->u.smpte.hour, lpTime->u.smpte.min,
              lpTime->u.smpte.sec, lpTime->u.smpte.frame);
        break;
    default:
        FIXME("Format %d not supported ! use TIME_MS !\n", lpTime->wType);
        lpTime->wType = TIME_MS;
    case TIME_MS:
        lpTime->u.ms = val / (wwo->format.wf.nAvgBytesPerSec / 1000);
        TRACE("TIME_MS=%lu\n", lpTime->u.ms);
        break;
    }
    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                              wodBreakLoop                    [internal]
 */
static DWORD wodBreakLoop(WORD wDevID)
{
    TRACE("(%u);\n", wDevID);
    
    if (wDevID >= MAX_WAVEOUTDRV || WOutDev[wDevID].play_stream == 
                (arts_stream_t*)-1)
    {
        WARN("bad device ID !\n");
        return MMSYSERR_BADDEVICEID;
    }
    ARTS_AddRingMessage(&WOutDev[wDevID].msgRing, WINE_WM_BREAKLOOP, 0, TRUE);
    return MMSYSERR_NOERROR;
}
    
/**************************************************************************
 *                              wodGetVolume                    [internal]
 */
static DWORD wodGetVolume(WORD wDevID, LPDWORD lpdwVol)
{
    DWORD left, right;

    left = WOutDev[wDevID].volume_left;
    right = WOutDev[wDevID].volume_right;

    TRACE("(%u, %p);\n", wDevID, lpdwVol);

    *lpdwVol = ((left * 0xFFFFl) / 100) + (((right * 0xFFFFl) / 100) << 
                16);

    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                              wodSetVolume                    [internal]
 */
static DWORD wodSetVolume(WORD wDevID, DWORD dwParam)
{
    DWORD left, right;

    left  = (LOWORD(dwParam) * 100) / 0xFFFFl;
    right = (HIWORD(dwParam) * 100) / 0xFFFFl;   

    TRACE("(%u, %08lX);\n", wDevID, dwParam);

    WOutDev[wDevID].volume_left = left;
    WOutDev[wDevID].volume_right = right;

    return MMSYSERR_NOERROR;
}

/**************************************************************************
 *                              wodGetNumDevs                   [internal]
 */
static  DWORD   wodGetNumDevs(void)
{
    DWORD       ret = 1;

    /* FIXME: For now, only one sound device (SOUND_DEV) is allowed */
    return ret;
}

/**************************************************************************
 *                              wodMessage (WINEARTS.@)
 */
DWORD WINAPI ARTS_wodMessage(UINT wDevID, UINT wMsg, DWORD dwUser, 
                            DWORD dwParam1, DWORD dwParam2)
{
    TRACE("(%u, %04X, %08lX, %08lX, %08lX);\n",
          wDevID, wMsg, dwUser, dwParam1, dwParam2);
    
    switch (wMsg) {
    case DRVM_INIT:
    case DRVM_EXIT:
    case DRVM_ENABLE:
    case DRVM_DISABLE:
        /* FIXME: Pretend this is supported */
        return 0;
    case WODM_OPEN:             return wodOpen          (wDevID, (LPWAVEOPENDESC)dwParam1,      dwParam2);
    case WODM_CLOSE:            return wodClose         (wDevID);
    case WODM_WRITE:            return wodWrite         (wDevID, (LPWAVEHDR)dwParam1,           dwParam2);
    case WODM_PAUSE:            return wodPause         (wDevID);
    case WODM_GETPOS:           return wodGetPosition   (wDevID, (LPMMTIME)dwParam1,            dwParam2);
    case WODM_BREAKLOOP:        return wodBreakLoop     (wDevID);
    case WODM_PREPARE:          return wodPrepare       (wDevID, (LPWAVEHDR)dwParam1,           dwParam2);
    case WODM_UNPREPARE:        return wodUnprepare     (wDevID, (LPWAVEHDR)dwParam1,           dwParam2);
    case WODM_GETDEVCAPS:       return wodGetDevCaps    (wDevID, (LPWAVEOUTCAPSA)dwParam1,      dwParam2);
    case WODM_GETNUMDEVS:       return wodGetNumDevs    ();
    case WODM_GETPITCH:         return MMSYSERR_NOTSUPPORTED;
    case WODM_SETPITCH:         return MMSYSERR_NOTSUPPORTED;
    case WODM_GETPLAYBACKRATE:  return MMSYSERR_NOTSUPPORTED;
    case WODM_SETPLAYBACKRATE:  return MMSYSERR_NOTSUPPORTED;
    case WODM_GETVOLUME:        return wodGetVolume     (wDevID, (LPDWORD)dwParam1);
    case WODM_SETVOLUME:        return wodSetVolume     (wDevID, dwParam1);
    case WODM_RESTART:          return wodRestart       (wDevID);
    case WODM_RESET:            return wodReset         (wDevID);

    case DRV_QUERYDSOUNDIFACE:  return wodDsCreate(wDevID, (PIDSDRIVER*)dwParam1);
    default:
        FIXME("unknown message %d!\n", wMsg);
    }
    return MMSYSERR_NOTSUPPORTED;
}

/*======================================================================*
 *                  Low level DSOUND implementation                     *
 *======================================================================*/

typedef struct IDsDriverImpl IDsDriverImpl;
typedef struct IDsDriverBufferImpl IDsDriverBufferImpl;

struct IDsDriverImpl
{
    /* IUnknown fields */
    ICOM_VFIELD(IDsDriver);
    DWORD               ref;
    /* IDsDriverImpl fields */
    UINT                wDevID;
    IDsDriverBufferImpl*primary;
};

struct IDsDriverBufferImpl
{
    /* IUnknown fields */
    ICOM_VFIELD(IDsDriverBuffer);
    DWORD               ref;
    /* IDsDriverBufferImpl fields */
    IDsDriverImpl*      drv;
    DWORD               buflen;
};

static DWORD wodDsCreate(UINT wDevID, PIDSDRIVER* drv)
{
    /* we can't perform memory mapping as we don't have a file stream 
        interface with arts like we do with oss */
    MESSAGE("This sound card's driver does not support direct access\n");
    MESSAGE("The (slower) DirectSound HEL mode will be used instead.\n");
    return MMSYSERR_NOTSUPPORTED;
}

#else /* !HAVE_ARTS */

/**************************************************************************
 *                              wodMessage (WINEARTS.@)
 */
DWORD WINAPI ARTS_wodMessage(WORD wDevID, WORD wMsg, DWORD dwUser, 
                            DWORD dwParam1, DWORD dwParam2)
{
    FIXME("(%u, %04X, %08lX, %08lX, %08lX):stub\n", wDevID, wMsg, dwUser, dwParam1, dwParam2);
    return MMSYSERR_NOTENABLED;
}

#endif /* HAVE_ARTS */