Remove aout_Packet from directsound audio output

modules/audio_output/directx.c

@@ -35,25 +35,10 @@
 #include <vlc_plugin.h>
 #include <vlc_aout.h>
 #include <vlc_charset.h>
-#include <vlc_atomic.h>
 
 #include "windows_audio_common.h"
 
-/*****************************************************************************
- * notification_thread_t: DirectX event thread
- *****************************************************************************/
-typedef struct notification_thread_t
-{
-    int i_frame_size;                          /* size in bytes of one frame */
-    int i_write_slot;       /* current write position in our circular buffer */
-
-    mtime_t start_date;
-    HANDLE event;
-
-    vlc_thread_t thread;
-    vlc_atomic_t abort;
-
-} notification_thread_t;
+#define DS_BUF_SIZE (1024*1024)
 
 /*****************************************************************************
  * aout_sys_t: directx audio output method descriptor
@@ -63,23 +48,24 @@ typedef struct notification_thread_t
  *****************************************************************************/
 struct aout_sys_t
 {
-    aout_packet_t       packet;
     HINSTANCE           hdsound_dll;  /* handle of the opened dsound dll */
 
     LPDIRECTSOUND       p_dsobject;   /* main Direct Sound object */
     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
                                        * takes care of mixing all the
                                        * secondary buffers into the primary) */
+
+    LPDIRECTSOUNDNOTIFY p_notify;
+    HANDLE hnotify_evt;
     struct
     {
-        LONG             volume;
+        float            volume;
         LONG             mb;
         bool             mute;
     } volume;
 
-    notification_thread_t notif;                  /* DirectSoundThread id */
-
-    int      i_frame_size;                     /* Size in bytes of one frame */
+    int      i_bytes_per_sample;      /* Size in bytes of one frame */     
+    int      i_rate;                  /* Sample rate */ 
 
     int      i_speaker_setup;         /* Speaker setup override */
 
@@ -87,6 +73,8 @@ struct aout_sys_t
     uint8_t  chan_table[AOUT_CHAN_MAX];
     uint32_t i_channel_mask;
     vlc_fourcc_t format;
+
+    size_t  i_write;
 };
 
 /*****************************************************************************
@@ -95,18 +83,20 @@ struct aout_sys_t
 static int  Open( vlc_object_t * );
 static void Close( vlc_object_t * );
 static void Stop( audio_output_t * );
-static void Play       ( audio_output_t *, block_t * );
-static int  VolumeSet  ( audio_output_t *, float );
-static int  MuteSet    ( audio_output_t *, bool );
+static void Play( audio_output_t *, block_t * );
+static int  VolumeSet( audio_output_t *, float );
+static int  MuteSet( audio_output_t *, bool );
+static void Flush( audio_output_t *, bool );
+static void Pause( audio_output_t *, bool, mtime_t );
+static int  TimeGet( audio_output_t *, mtime_t *);
 
 /* local functions */
 static void Probe( audio_output_t *, const audio_sample_format_t * );
 static int  InitDirectSound   ( audio_output_t * );
-static int  CreateDSBuffer    ( audio_output_t *, int, int, int, int, int, bool );
+static int  CreateDSBuffer    ( audio_output_t *, int, int, int, int, bool );
 static int  CreateDSBufferPCM ( audio_output_t *, vlc_fourcc_t*, int, int, bool );
 static void DestroyDSBuffer   ( audio_output_t * );
-static void* DirectSoundThread( void * );
-static int  FillBuffer        ( audio_output_t *, int, block_t * );
+static int  FillBuffer        ( audio_output_t *, block_t * );
 
 static int ReloadDirectXDevices( vlc_object_t *, const char *,
                                  char ***, char *** );
@@ -145,7 +135,7 @@ vlc_module_begin ()
     add_string( "directx-audio-speaker", "Windows default",
                  SPEAKER_TEXT, SPEAKER_LONGTEXT, true )
         change_string_list( speaker_list, speaker_list )
-    add_integer( "directx-volume", DSBVOLUME_MAX,
+    add_float( "directx-volume", 1.0f,
                  VOLUME_TEXT, VOLUME_LONGTEXT, true )
         change_integer_range( DSBVOLUME_MIN, DSBVOLUME_MAX )
 
@@ -216,19 +206,15 @@ static int Start( audio_output_t *p_aout, audio_sample_format_t *restrict fmt )
         /* Calculate the frame size in bytes */
         fmt->i_bytes_per_frame = AOUT_SPDIF_SIZE;
         fmt->i_frame_length = A52_FRAME_NB;
-        p_aout->sys->i_frame_size = fmt->i_bytes_per_frame;
 
         if( CreateDSBuffer( p_aout, VLC_CODEC_SPDIFL,
                             fmt->i_physical_channels,
-                            aout_FormatNbChannels( fmt ), fmt->i_rate,
-                            p_aout->sys->i_frame_size, false )
+                            aout_FormatNbChannels( fmt ), fmt->i_rate, false )
             != VLC_SUCCESS )
         {
             msg_Err( p_aout, "cannot open directx audio device" );
             goto error;
         }
-
-        aout_PacketInit( p_aout, &p_aout->sys->packet, A52_FRAME_NB, fmt );
     }
     else
     {
@@ -254,37 +240,19 @@ static int Start( audio_output_t *p_aout, audio_sample_format_t *restrict fmt )
             msg_Err( p_aout, "cannot open directx audio device" );
             goto error;
         }
-
-        /* Calculate the frame size in bytes */
-        aout_PacketInit( p_aout, &p_aout->sys->packet, fmt->i_rate / 20, fmt );
     }
+    p_aout->sys->i_write = 0;
 
-    /* Force volume update in thread. TODO: use session volume on Vista+ */
-    p_aout->sys->volume.volume = p_aout->sys->volume.mb;
-
-    /* Now we need to setup our DirectSound play notification structure */
-    vlc_atomic_set(&p_aout->sys->notif.abort, 0);
-    p_aout->sys->notif.event = CreateEvent( 0, FALSE, FALSE, 0 );
-    if( unlikely(p_aout->sys->notif.event == NULL) )
-        abort();
-    p_aout->sys->notif.i_frame_size =  p_aout->sys->i_frame_size;
+    /* Force volume update */
+    VolumeSet( p_aout, p_aout->sys->volume.volume );
+    MuteSet( p_aout, p_aout->sys->volume.mute );
 
     /* then launch the notification thread */
-    msg_Dbg( p_aout, "creating DirectSoundThread" );
-    if( vlc_clone( &p_aout->sys->notif.thread, DirectSoundThread, p_aout,
-                   VLC_THREAD_PRIORITY_HIGHEST ) )
-    {
-        msg_Err( p_aout, "cannot create DirectSoundThread" );
-        CloseHandle( p_aout->sys->notif.event );
-        p_aout->sys->notif.event = NULL;
-        aout_PacketDestroy( p_aout );
-        goto error;
-    }
-
-    p_aout->time_get = aout_PacketTimeGet;
+    p_aout->time_get = TimeGet;
     p_aout->play = Play;
-    p_aout->pause = NULL;
-    p_aout->flush = aout_PacketFlush;
+    p_aout->pause = Pause;
+    p_aout->flush = Flush;
+
     return VLC_SUCCESS;
 
  error:
@@ -479,8 +447,7 @@ static void Probe( audio_output_t * p_aout, const audio_sample_format_t *fmt )
     {
         if( CreateDSBuffer( p_aout, VLC_CODEC_SPDIFL,
                             fmt->i_physical_channels,
-                            aout_FormatNbChannels( fmt ), fmt->i_rate,
-                            AOUT_SPDIF_SIZE, true )
+                            aout_FormatNbChannels( fmt ), fmt->i_rate, true )
             == VLC_SUCCESS )
         {
             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
@@ -511,26 +478,29 @@ static void Probe( audio_output_t * p_aout, const audio_sample_format_t *fmt )
  *****************************************************************************/
 static void Play( audio_output_t *p_aout, block_t *p_buffer )
 {
-    /* get the playing date of the first aout buffer */
-    p_aout->sys->notif.start_date = p_buffer->i_pts;
-
-    /* fill in the first samples (zeroes) */
-    FillBuffer( p_aout, 0, NULL );
-
-    /* wake up the audio output thread */
-    SetEvent( p_aout->sys->notif.event );
-
-    aout_PacketPlay( p_aout, p_buffer );
-    p_aout->play = aout_PacketPlay;
+    if(  FillBuffer( p_aout, p_buffer ) ==  VLC_SUCCESS )
+    {
+        /* start playing the buffer */
+        HRESULT dsresult = IDirectSoundBuffer_Play( p_aout->sys->p_dsbuffer,
+                                                    0, 0, DSBPLAY_LOOPING );
+        if( dsresult == DSERR_BUFFERLOST )
+        {
+            IDirectSoundBuffer_Restore( p_aout->sys->p_dsbuffer );
+            dsresult = IDirectSoundBuffer_Play( p_aout->sys->p_dsbuffer,
+                                                0, 0, DSBPLAY_LOOPING );
+        }
+        if( dsresult != DS_OK )
+            msg_Err( p_aout, "cannot start playing buffer" );
+    }
 }
 
-static int VolumeSet( audio_output_t *p_aout, float vol )
+static int VolumeSet( audio_output_t *p_aout, float volume )
 {
     aout_sys_t *sys = p_aout->sys;
     int ret = 0;
 
     /* Convert UI volume to linear factor (cube) */
-    vol = vol * vol * vol;
+    float vol = volume * volume * volume;
 
     /* millibels from linear amplification */
     LONG mb = lroundf(2000.f * log10f(vol));
@@ -546,28 +516,31 @@ static int VolumeSet( audio_output_t *p_aout, float vol )
         mb = DSBVOLUME_MIN;
 
     sys->volume.mb = mb;
-    if (!sys->volume.mute)
-        InterlockedExchange(&sys->volume.volume, mb);
-
+    sys->volume.volume = volume;
+    if( !sys->volume.mute && sys->p_dsbuffer &&
+        IDirectSoundBuffer_SetVolume( sys->p_dsbuffer, mb ) != DS_OK )
+        return -1;
     /* Convert back to UI volume */
-    vol = cbrtf(powf(10.f, ((float)mb) / 2000.f));
-    aout_VolumeReport( p_aout, vol );
+    aout_VolumeReport( p_aout, volume );
 
     if( var_InheritBool( p_aout, "volume-save" ) )
-        config_PutInt( p_aout, "directx-volume", mb );
+        config_PutFloat( p_aout, "directx-volume", volume );
     return ret;
 }
 
 static int MuteSet( audio_output_t *p_aout, bool mute )
 {
+    HRESULT res = DS_OK;
     aout_sys_t *sys = p_aout->sys;
 
     sys->volume.mute = mute;
-    InterlockedExchange(&sys->volume.volume,
-                        mute ? DSBVOLUME_MIN : sys->volume.mb);
+
+    if( sys->p_dsbuffer )
+        res = IDirectSoundBuffer_SetVolume( sys->p_dsbuffer,
+                                            mute? DSBVOLUME_MIN : sys->volume.mb );
 
     aout_MuteReport( p_aout, mute );
-    return 0;
+    return (res != DS_OK);
 }
 
 /*****************************************************************************
@@ -576,27 +549,19 @@ static int MuteSet( audio_output_t *p_aout, bool mute )
 static void Stop( audio_output_t *p_aout )
 {
     aout_sys_t *p_sys = p_aout->sys;
-
     msg_Dbg( p_aout, "closing audio device" );
 
-    /* kill the position notification thread, if any */
-    if( p_sys->notif.event != NULL )
-    {
-        vlc_atomic_set(&p_aout->sys->notif.abort, 1);
-        /* wake up the audio thread if needed */
-        if( p_aout->play == Play )
-            SetEvent( p_sys->notif.event );
-
-        vlc_join( p_sys->notif.thread, NULL );
-        CloseHandle( p_sys->notif.event );
-        aout_PacketDestroy( p_aout );
-    }
+    if( p_sys->p_notify )
+        IDirectSoundNotify_Release(p_sys->p_notify );
+    p_sys->p_notify = NULL;
 
+    IDirectSoundBuffer_Stop( p_sys->p_dsbuffer );
     /* release the secondary buffer */
     DestroyDSBuffer( p_aout );
 
     /* finally release the DirectSound object */
-    if( p_sys->p_dsobject ) IDirectSound_Release( p_sys->p_dsobject );
+    if( p_sys->p_dsobject )
+        IDirectSound_Release( p_sys->p_dsobject );
 }
 
 /*****************************************************************************
@@ -675,7 +640,7 @@ static int InitDirectSound( audio_output_t *p_aout )
  *****************************************************************************/
 static int CreateDSBuffer( audio_output_t *p_aout, int i_format,
                            int i_channels, int i_nb_channels, int i_rate,
-                           int i_bytes_per_frame, bool b_probe )
+                           bool b_probe )
 {
     WAVEFORMATEXTENSIBLE waveformat;
     DSBUFFERDESC         dsbdesc;
@@ -723,14 +688,16 @@ static int CreateDSBuffer( audio_output_t *p_aout, int i_format,
     waveformat.Format.nAvgBytesPerSec =
         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 
+    p_aout->sys->i_bytes_per_sample = waveformat.Format.nBlockAlign;
     p_aout->sys->format = i_format;
 
     /* Then fill in the direct sound descriptor */
     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
-    dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
+    dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2 /* Better position accuracy */
                     | DSBCAPS_GLOBALFOCUS         /* Allows background playing */
-                    | DSBCAPS_CTRLVOLUME;       /* Allows volume control */
+                    | DSBCAPS_CTRLVOLUME          /* Allows volume control */
+                    | DSBCAPS_CTRLPOSITIONNOTIFY; /* Allow position notifications */
 
     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
     if( i_nb_channels <= 2 )
@@ -747,7 +714,7 @@ static int CreateDSBuffer( audio_output_t *p_aout, int i_format,
         dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
     }
 
-    dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
+    dsbdesc.dwBufferBytes = DS_BUF_SIZE; /* buffer size */
     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 
     if FAILED( IDirectSound_CreateSoundBuffer(
@@ -781,7 +748,7 @@ static int CreateDSBuffer( audio_output_t *p_aout, int i_format,
         return VLC_SUCCESS;
     }
 
-    p_aout->sys->i_frame_size = i_bytes_per_frame;
+    p_aout->sys->i_rate = i_rate;
     p_aout->sys->i_channel_mask = waveformat.dwChannelMask;
     p_aout->sys->chans_to_reorder =
         aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
@@ -792,6 +759,18 @@ static int CreateDSBuffer( audio_output_t *p_aout, int i_format,
         msg_Dbg( p_aout, "channel reordering needed" );
     }
 
+    if( IDirectSoundBuffer_QueryInterface( p_aout->sys->p_dsbuffer,
+                                           &IID_IDirectSoundNotify,
+                                           (void **) &p_aout->sys->p_notify )
+            != DS_OK )
+    {
+        
+        msg_Err(p_aout, "Couldn't query IDirectSoundNotify");
+        p_aout->sys->p_notify = NULL;
+    }
+
+    FillBuffer(p_aout,NULL);
+
     return VLC_SUCCESS;
 }
 
@@ -810,13 +789,11 @@ static int CreateDSBufferPCM( audio_output_t *p_aout, vlc_fourcc_t *i_format,
     if( !var_GetBool( p_aout, "directx-audio-float32" ) ||
         i_nb_channels > 2 ||
         CreateDSBuffer( p_aout, VLC_CODEC_FL32,
-                        i_channels, i_nb_channels, i_rate,
-                        (i_rate / 20) * 4 * i_nb_channels, b_probe )
+                        i_channels, i_nb_channels, i_rate, b_probe )
         != VLC_SUCCESS )
     {
         if ( CreateDSBuffer( p_aout, VLC_CODEC_S16N,
-                             i_channels, i_nb_channels, i_rate,
-                             (i_rate / 20) * 2 * i_nb_channels, b_probe )
+                             i_channels, i_nb_channels, i_rate, b_probe )
              != VLC_SUCCESS )
         {
             return VLC_EGENERIC;
@@ -853,10 +830,11 @@ static void DestroyDSBuffer( audio_output_t *p_aout )
  *****************************************************************************
  * Returns VLC_SUCCESS on success.
  *****************************************************************************/
-static int FillBuffer( audio_output_t *p_aout, int i_frame, block_t *p_buffer )
+static int FillBuffer( audio_output_t *p_aout, block_t *p_buffer )
 {
     aout_sys_t *p_sys = p_aout->sys;
-    notification_thread_t *p_notif = &p_sys->notif;
+
+    size_t towrite = (p_buffer)?p_buffer->i_buffer:DS_BUF_SIZE;
     void *p_write_position, *p_wrap_around;
     unsigned long l_bytes1, l_bytes2;
     HRESULT dsresult;
@@ -864,20 +842,20 @@ static int FillBuffer( audio_output_t *p_aout, int i_frame, block_t *p_buffer )
     /* Before copying anything, we have to lock the buffer */
     dsresult = IDirectSoundBuffer_Lock(
                 p_sys->p_dsbuffer,         /* DS buffer */
-                i_frame * p_notif->i_frame_size,             /* Start offset */
-                p_notif->i_frame_size,                    /* Number of bytes */
+                p_aout->sys->i_write,      /* Start offset */
+                towrite,                   /* Number of bytes */
                 &p_write_position,         /* Address of lock start */
                 &l_bytes1,                 /* Count of bytes locked before wrap around */
                 &p_wrap_around,            /* Buffer address (if wrap around) */
                 &l_bytes2,                 /* Count of bytes after wrap around */
-                0 );                                                /* Flags */
+                0 );                       /* Flags: DSBLOCK_FROMWRITECURSOR is buggy */
     if( dsresult == DSERR_BUFFERLOST )
     {
         IDirectSoundBuffer_Restore( p_sys->p_dsbuffer );
         dsresult = IDirectSoundBuffer_Lock(
                                p_sys->p_dsbuffer,
-                               i_frame * p_notif->i_frame_size,
-                               p_notif->i_frame_size,
+                               p_aout->sys->i_write,
+                               towrite,
                                &p_write_position,
                                &l_bytes1,
                                &p_wrap_around,
@@ -904,6 +882,8 @@ static int FillBuffer( audio_output_t *p_aout, int i_frame, block_t *p_buffer )
                                  p_sys->format );
 
         memcpy( p_write_position, p_buffer->p_buffer, l_bytes1 );
+        if( l_bytes1 < p_buffer->i_buffer)
+            memcpy(p_wrap_around, p_buffer->p_buffer + l_bytes1, l_bytes2);
         block_Release( p_buffer );
     }
 
@@ -911,117 +891,10 @@ static int FillBuffer( audio_output_t *p_aout, int i_frame, block_t *p_buffer )
     IDirectSoundBuffer_Unlock( p_sys->p_dsbuffer, p_write_position, l_bytes1,
                                p_wrap_around, l_bytes2 );
 
-    p_notif->i_write_slot = (i_frame + 1) % FRAMES_NUM;
-    return VLC_SUCCESS;
-}
-
-/*****************************************************************************
- * DirectSoundThread: this thread will capture play notification events.
- *****************************************************************************
- * We use this thread to emulate a callback mechanism. The thread probes for
- * event notification and fills up the DS secondary buffer when needed.
- *****************************************************************************/
-static void* DirectSoundThread( void *data )
-{
-    audio_output_t *p_aout = (audio_output_t *)data;
-    notification_thread_t *p_notif = &p_aout->sys->notif;
-    mtime_t last_time;
-
-    msg_Dbg( p_aout, "DirectSoundThread ready" );
-
-    /* Wait here until Play() is called */
-    WaitForSingleObject( p_notif->event, INFINITE );
-
-    if( !vlc_atomic_get( &p_notif->abort) )
-    {
-        HRESULT dsresult;
-        mwait( p_notif->start_date - AOUT_MAX_PTS_ADVANCE / 2 );
-
-        /* start playing the buffer */
-        dsresult = IDirectSoundBuffer_Play( p_aout->sys->p_dsbuffer,
-                                        0,                         /* Unused */
-                                        0,                         /* Unused */
-                                        DSBPLAY_LOOPING );          /* Flags */
-        if( dsresult == DSERR_BUFFERLOST )
-        {
-            IDirectSoundBuffer_Restore( p_aout->sys->p_dsbuffer );
-            dsresult = IDirectSoundBuffer_Play(
-                                            p_aout->sys->p_dsbuffer,
-                                            0,                     /* Unused */
-                                            0,                     /* Unused */
-                                            DSBPLAY_LOOPING );      /* Flags */
-        }
-        if( dsresult != DS_OK )
-        {
-            msg_Err( p_aout, "cannot start playing buffer" );
-        }
-    }
-    last_time = mdate();
-
-    while( !vlc_atomic_get( &p_notif->abort ) )
-    {
-        DWORD l_read;
-        int l_queued = 0, l_free_slots;
-        unsigned i_frame_siz = p_aout->sys->packet.samples;
-        mtime_t mtime = mdate();
-        int i;
-
-        /* Update volume if required */
-        LONG volume = InterlockedExchange( &p_aout->sys->volume.volume, -1 );
-        if( unlikely(volume != -1) )
-            IDirectSoundBuffer_SetVolume( p_aout->sys->p_dsbuffer, volume );
-
-        /*
-         * Fill in as much audio data as we can in our circular buffer
-         */
-
-        /* Find out current play position */
-        if FAILED( IDirectSoundBuffer_GetCurrentPosition(
-                   p_aout->sys->p_dsbuffer, &l_read, NULL ) )
-        {
-            msg_Err( p_aout, "GetCurrentPosition() failed!" );
-            l_read = 0;
-        }
-
-        /* Detect underruns */
-        if( l_queued && mtime - last_time >
-            INT64_C(1000000) * l_queued / p_aout->sys->packet.format.i_rate )
-        {
-            msg_Dbg( p_aout, "detected underrun!" );
-        }
-        last_time = mtime;
+    p_sys->i_write += towrite;
+    p_sys->i_write %= DS_BUF_SIZE;
 
-        /* Try to fill in as many frame buffers as possible */
-        l_read /= (p_aout->sys->packet.format.i_bytes_per_frame /
-            p_aout->sys->packet.format.i_frame_length);
-        l_queued = p_notif->i_write_slot * i_frame_siz - l_read;
-        if( l_queued < 0 ) l_queued += (i_frame_siz * FRAMES_NUM);
-        l_free_slots = (FRAMES_NUM * i_frame_siz - l_queued) / i_frame_siz;
-
-        for( i = 0; i < l_free_slots; i++ )
-        {
-            block_t *p_buffer = aout_PacketNext( p_aout,
-                mtime + INT64_C(1000000) * (i * i_frame_siz + l_queued) /
-                p_aout->sys->packet.format.i_rate );
-
-            /* If there is no audio data available and we have some buffered
-             * already, then just wait for the next time */
-            if( !p_buffer && (i || l_queued / i_frame_siz) ) break;
-
-            if( FillBuffer( p_aout, p_notif->i_write_slot % FRAMES_NUM,
-                            p_buffer ) != VLC_SUCCESS ) break;
-        }
-
-        /* Sleep a reasonable amount of time */
-        l_queued += (i * i_frame_siz);
-        msleep( INT64_C(1000000) * l_queued / p_aout->sys->packet.format.i_rate / 2 );
-    }
-
-    /* make sure the buffer isn't playing */
-    IDirectSoundBuffer_Stop( p_aout->sys->p_dsbuffer );
-
-    msg_Dbg( p_aout, "DirectSoundThread exiting" );
-    return NULL;
+    return VLC_SUCCESS;
 }
 
 typedef struct
@@ -1106,11 +979,19 @@ static int Open(vlc_object_t *obj)
     aout->mute_set = MuteSet;
 
     /* Volume */
-    LONG mb = var_InheritInteger(aout, "directx-volume");
-    sys->volume.mb = mb;
-    aout_VolumeReport(aout, cbrtf(powf(10.f, ((float)mb) / 2000.f)));
+    sys->volume.volume = var_InheritFloat(aout, "directx-volume");
+    aout_VolumeReport(aout, sys->volume.volume );
     MuteSet(aout, var_InheritBool(aout, "mute"));
 
+    sys->hnotify_evt = CreateEvent(NULL, FALSE, TRUE, NULL);
+    if( !sys->hnotify_evt )
+    {
+        msg_Err(aout, "cannot create Event");
+        FreeLibrary(sys->hdsound_dll);
+        free(sys);
+        return VLC_EGENERIC;
+    }
+
     return VLC_SUCCESS;
 }
 
@@ -1119,6 +1000,67 @@ static void Close(vlc_object_t *obj)
     audio_output_t *aout = (audio_output_t *)obj;
     aout_sys_t *sys = aout->sys;
 
+    CloseHandle(sys->hnotify_evt);
     FreeLibrary(sys->hdsound_dll); /* free DSOUND.DLL */
     free(sys);
 }
+
+static void Flush ( audio_output_t * aout, bool drain )
+{
+    aout_sys_t *sys = aout->sys;
+    size_t read;
+    if( drain )
+    {
+        if( sys->p_notify )
+        {
+            DSBPOSITIONNOTIFY notif = {.dwOffset = aout->sys->i_write, .hEventNotify = sys->hnotify_evt } ;
+            if( IDirectSoundNotify_SetNotificationPositions( sys->p_notify, 1, &notif ) ==  DS_OK )
+            {
+                WaitForSingleObject( sys->hnotify_evt, INFINITE );
+                IDirectSoundBuffer_Stop( aout->sys->p_dsbuffer );
+            }
+        }
+        else
+            while( IDirectSoundBuffer_GetCurrentPosition( aout->sys->p_dsbuffer,(LPDWORD) &read, NULL) ==  DS_OK )
+            {
+                read %= DS_BUF_SIZE;
+                if( read == aout->sys->i_write )
+                    break;
+                msleep(10000);
+            }
+    }
+    else
+    {
+        IDirectSoundBuffer_Stop( aout->sys->p_dsbuffer );
+        IDirectSoundBuffer_SetCurrentPosition( aout->sys->p_dsbuffer, 
+                                               aout->sys->i_write );
+    }
+}
+
+static void Pause( audio_output_t * aout, bool pause, mtime_t date )
+{
+    (void) date;
+    if( pause )
+        IDirectSoundBuffer_Stop( aout->sys->p_dsbuffer );
+    else
+        IDirectSoundBuffer_Play( aout->sys->p_dsbuffer, 0, 0, DSBPLAY_LOOPING );
+}
+
+
+static int TimeGet( audio_output_t * aout, mtime_t * delay )
+{
+    uint32_t read;
+    mtime_t size;
+
+    if( IDirectSoundBuffer_GetCurrentPosition( aout->sys->p_dsbuffer, (LPDWORD) &read, NULL) !=  DS_OK )
+        return 1;
+
+    read %= DS_BUF_SIZE;
+
+    size = (mtime_t)aout->sys->i_write - (mtime_t) read;
+    if( size < 0 )
+        size += DS_BUF_SIZE;
+
+    *delay = ( size / aout->sys->i_bytes_per_sample ) * CLOCK_FREQ / aout->sys->i_rate;
+    return 0;
+}