libao2/ao_dsound.c

   1 /******************************************************************************
   2  * ao_dsound.c: Windows DirectSound interface for MPlayer
   3  * Copyright (c) 2004 Gabor Szecsi <deje@miki.hu>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  18  *
  19  *****************************************************************************/
  20 /**
  21 \todo verify/extend multichannel support
  22 */
  23
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <windows.h>
  28 #define DIRECTSOUND_VERSION 0x0600
  29 #include <dsound.h>
  30 #include <math.h>
  31
  32 #include "config.h"
  33 #include "libaf/af_format.h"
  34 #include "audio_out.h"
  35 #include "audio_out_internal.h"
  36 #include "mp_msg.h"
  37 #include "libvo/fastmemcpy.h"
  38 #include "osdep/timer.h"
  39 #include "subopt-helper.h"
  40
  41
  42 static ao_info_t info =
  43 {
  44         "Windows DirectSound audio output",
  45         "dsound",
  46         "Gabor Szecsi <deje@miki.hu>",
  47         ""
  48 };
  49
  50 LIBAO_EXTERN(dsound)
  51
  52 /**
  53 \todo use the definitions from the win32 api headers when they define these
  54 */
  55 #if 1
  56 #define WAVE_FORMAT_IEEE_FLOAT 0x0003
  57 #define WAVE_FORMAT_DOLBY_AC3_SPDIF 0x0092
  58 #define WAVE_FORMAT_EXTENSIBLE 0xFFFE
  59
  60 static const GUID KSDATAFORMAT_SUBTYPE_PCM = {0x1,0x0000,0x0010, {0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71}};
  61
  62 #define SPEAKER_FRONT_LEFT             0x1
  63 #define SPEAKER_FRONT_RIGHT            0x2
  64 #define SPEAKER_FRONT_CENTER           0x4
  65 #define SPEAKER_LOW_FREQUENCY          0x8
  66 #define SPEAKER_BACK_LEFT              0x10
  67 #define SPEAKER_BACK_RIGHT             0x20
  68 #define SPEAKER_FRONT_LEFT_OF_CENTER   0x40
  69 #define SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
  70 #define SPEAKER_BACK_CENTER            0x100
  71 #define SPEAKER_SIDE_LEFT              0x200
  72 #define SPEAKER_SIDE_RIGHT             0x400
  73 #define SPEAKER_TOP_CENTER             0x800
  74 #define SPEAKER_TOP_FRONT_LEFT         0x1000
  75 #define SPEAKER_TOP_FRONT_CENTER       0x2000
  76 #define SPEAKER_TOP_FRONT_RIGHT        0x4000
  77 #define SPEAKER_TOP_BACK_LEFT          0x8000
  78 #define SPEAKER_TOP_BACK_CENTER        0x10000
  79 #define SPEAKER_TOP_BACK_RIGHT         0x20000
  80 #define SPEAKER_RESERVED               0x80000000
  81
  82 #define DSSPEAKER_HEADPHONE         0x00000001
  83 #define DSSPEAKER_MONO              0x00000002
  84 #define DSSPEAKER_QUAD              0x00000003
  85 #define DSSPEAKER_STEREO            0x00000004
  86 #define DSSPEAKER_SURROUND          0x00000005
  87 #define DSSPEAKER_5POINT1           0x00000006
  88
  89 #ifndef _WAVEFORMATEXTENSIBLE_
  90 typedef struct {
  91     WAVEFORMATEX    Format;
  92     union {
  93         WORD wValidBitsPerSample;       /* bits of precision  */
  94         WORD wSamplesPerBlock;          /* valid if wBitsPerSample==0 */
  95         WORD wReserved;                 /* If neither applies, set to zero. */
  96     } Samples;
  97     DWORD           dwChannelMask;      /* which channels are */
  98                                         /* present in stream  */
  99     GUID            SubFormat;
 100 } WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;
 101 #endif
 102
 103 #endif
 104
 105 static const int channel_mask[] = {
 106   SPEAKER_FRONT_LEFT   | SPEAKER_FRONT_RIGHT  | SPEAKER_LOW_FREQUENCY,
 107   SPEAKER_FRONT_LEFT   | SPEAKER_FRONT_RIGHT  | SPEAKER_BACK_LEFT    | SPEAKER_BACK_RIGHT,
 108   SPEAKER_FRONT_LEFT   | SPEAKER_FRONT_RIGHT  | SPEAKER_BACK_LEFT    | SPEAKER_BACK_RIGHT   | SPEAKER_LOW_FREQUENCY,
 109   SPEAKER_FRONT_LEFT   | SPEAKER_FRONT_CENTER | SPEAKER_FRONT_RIGHT  | SPEAKER_BACK_LEFT    | SPEAKER_BACK_RIGHT     | SPEAKER_LOW_FREQUENCY
 110 };
 111
 112 static HINSTANCE hdsound_dll = NULL;      ///handle to the dll
 113 static LPDIRECTSOUND hds = NULL;          ///direct sound object
 114 static LPDIRECTSOUNDBUFFER hdspribuf = NULL; ///primary direct sound buffer
 115 static LPDIRECTSOUNDBUFFER hdsbuf = NULL; ///secondary direct sound buffer (stream buffer)
 116 static int buffer_size = 0;               ///size in bytes of the direct sound buffer
 117 static int write_offset = 0;              ///offset of the write cursor in the direct sound buffer
 118 static int min_free_space = 0;            ///if the free space is below this value get_space() will return 0
 119                                           ///there will always be at least this amout of free space to prevent
 120                                           ///get_space() from returning wrong values when buffer is 100% full.
 121                                           ///will be replaced with nBlockAlign in init()
 122 static int device_num = 0;                ///wanted device number
 123 static GUID device;                       ///guid of the device
 124
 125 /***************************************************************************************/
 126
 127 /**
 128 \brief output error message
 129 \param err error code
 130 \return string with the error message
 131 */
 132 static char * dserr2str(int err)
 133 {
 134         switch (err) {
 135                 case DS_OK: return "DS_OK";
 136                 case DS_NO_VIRTUALIZATION: return "DS_NO_VIRTUALIZATION";
 137                 case DSERR_ALLOCATED: return "DS_NO_VIRTUALIZATION";
 138                 case DSERR_CONTROLUNAVAIL: return "DSERR_CONTROLUNAVAIL";
 139                 case DSERR_INVALIDPARAM: return "DSERR_INVALIDPARAM";
 140                 case DSERR_INVALIDCALL: return "DSERR_INVALIDCALL";
 141                 case DSERR_GENERIC: return "DSERR_GENERIC";
 142                 case DSERR_PRIOLEVELNEEDED: return "DSERR_PRIOLEVELNEEDED";
 143                 case DSERR_OUTOFMEMORY: return "DSERR_OUTOFMEMORY";
 144                 case DSERR_BADFORMAT: return "DSERR_BADFORMAT";
 145                 case DSERR_UNSUPPORTED: return "DSERR_UNSUPPORTED";
 146                 case DSERR_NODRIVER: return "DSERR_NODRIVER";
 147                 case DSERR_ALREADYINITIALIZED: return "DSERR_ALREADYINITIALIZED";
 148                 case DSERR_NOAGGREGATION: return "DSERR_NOAGGREGATION";
 149                 case DSERR_BUFFERLOST: return "DSERR_BUFFERLOST";
 150                 case DSERR_OTHERAPPHASPRIO: return "DSERR_OTHERAPPHASPRIO";
 151                 case DSERR_UNINITIALIZED: return "DSERR_UNINITIALIZED";
 152                 case DSERR_NOINTERFACE: return "DSERR_NOINTERFACE";
 153                 case DSERR_ACCESSDENIED: return "DSERR_ACCESSDENIED";
 154                 default: return "unknown";
 155         }
 156 }
 157
 158 /**
 159 \brief uninitialize direct sound
 160 */
 161 static void UninitDirectSound(void)
 162 {
 163     // finally release the DirectSound object
 164     if (hds) {
 165         IDirectSound_Release(hds);
 166         hds = NULL;
 167     }
 168     // free DSOUND.DLL
 169     if (hdsound_dll) {
 170         FreeLibrary(hdsound_dll);
 171         hdsound_dll = NULL;
 172     }
 173         mp_msg(MSGT_AO, MSGL_V, "ao_dsound: DirectSound uninitialized\n");
 174 }
 175
 176 /**
 177 \brief print the commandline help
 178 */
 179 static void print_help(void)
 180 {
 181   mp_msg(MSGT_AO, MSGL_FATAL,
 182            "\n-ao dsound commandline help:\n"
 183            "Example: mplayer -ao dsound:device=1\n"
 184            "  sets 1st device\n"
 185            "\nOptions:\n"
 186            "  device=<device-number>\n"
 187            "    Sets device number, use -v to get a list\n");
 188 }
 189
 190
 191 /**
 192 \brief enumerate direct sound devices
 193 \return TRUE to continue with the enumeration
 194 */
 195 static BOOL CALLBACK DirectSoundEnum(LPGUID guid,LPCSTR desc,LPCSTR module,LPVOID context)
 196 {
 197     int* device_index=context;
 198     mp_msg(MSGT_AO, MSGL_V,"%i %s ",*device_index,desc);
 199     if(device_num==*device_index){
 200         mp_msg(MSGT_AO, MSGL_V,"<--");
 201         if(guid){
 202             memcpy(&device,guid,sizeof(GUID));
 203         }
 204     }
 205     mp_msg(MSGT_AO, MSGL_V,"\n");
 206     (*device_index)++;
 207     return TRUE;
 208 }
 209
 210
 211 /**
 212 \brief initilize direct sound
 213 \return 0 if error, 1 if ok
 214 */
 215 static int InitDirectSound(void)
 216 {
 217         DSCAPS dscaps;
 218
 219         // initialize directsound
 220     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 221         HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACKA, LPVOID);
 222         int device_index=0;
 223         opt_t subopts[] = {
 224           {"device", OPT_ARG_INT, &device_num,NULL},
 225           {NULL}
 226         };
 227         if (subopt_parse(ao_subdevice, subopts) != 0) {
 228                 print_help();
 229                 return 0;
 230         }
 231
 232         hdsound_dll = LoadLibrary("DSOUND.DLL");
 233         if (hdsound_dll == NULL) {
 234                 mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: cannot load DSOUND.DLL\n");
 235                 return 0;
 236         }
 237         OurDirectSoundCreate = (void*)GetProcAddress(hdsound_dll, "DirectSoundCreate");
 238         OurDirectSoundEnumerate = (void*)GetProcAddress(hdsound_dll, "DirectSoundEnumerateA");
 239
 240         if (OurDirectSoundCreate == NULL || OurDirectSoundEnumerate == NULL) {
 241                 mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: GetProcAddress FAILED\n");
 242                 FreeLibrary(hdsound_dll);
 243                 return 0;
 244         }
 245
 246         // Enumerate all directsound devices
 247         mp_msg(MSGT_AO, MSGL_V,"ao_dsound: Output Devices:\n");
 248         OurDirectSoundEnumerate(DirectSoundEnum,&device_index);
 249
 250         // Create the direct sound object
 251         if FAILED(OurDirectSoundCreate((device_num)?&device:NULL, &hds, NULL )) {
 252                 mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: cannot create a DirectSound device\n");
 253                 FreeLibrary(hdsound_dll);
 254                 return 0;
 255         }
 256
 257         /* Set DirectSound Cooperative level, ie what control we want over Windows
 258          * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 259          * settings of the primary buffer, but also that only the sound of our
 260          * application will be hearable when it will have the focus.
 261          * !!! (this is not really working as intended yet because to set the
 262          * cooperative level you need the window handle of your application, and
 263          * I don't know of any easy way to get it. Especially since we might play
 264          * sound without any video, and so what window handle should we use ???
 265          * The hack for now is to use the Desktop window handle - it seems to be
 266          * working */
 267         if (IDirectSound_SetCooperativeLevel(hds, GetDesktopWindow(), DSSCL_EXCLUSIVE)) {
 268                 mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: cannot set direct sound cooperative level\n");
 269                 IDirectSound_Release(hds);
 270                 FreeLibrary(hdsound_dll);
 271                 return 0;
 272         }
 273         mp_msg(MSGT_AO, MSGL_V, "ao_dsound: DirectSound initialized\n");
 274
 275         memset(&dscaps, 0, sizeof(DSCAPS));
 276         dscaps.dwSize = sizeof(DSCAPS);
 277         if (DS_OK == IDirectSound_GetCaps(hds, &dscaps)) {
 278                 if (dscaps.dwFlags & DSCAPS_EMULDRIVER) mp_msg(MSGT_AO, MSGL_V, "ao_dsound: DirectSound is emulated, waveOut may give better performance\n");
 279         } else {
 280                 mp_msg(MSGT_AO, MSGL_V, "ao_dsound: cannot get device capabilities\n");
 281         }
 282
 283         return 1;
 284 }
 285
 286 /**
 287 \brief destroy the direct sound buffer
 288 */
 289 static void DestroyBuffer(void)
 290 {
 291         if (hdsbuf) {
 292                 IDirectSoundBuffer_Release(hdsbuf);
 293                 hdsbuf = NULL;
 294         }
 295         if (hdspribuf) {
 296                 IDirectSoundBuffer_Release(hdspribuf);
 297                 hdspribuf = NULL;
 298         }
 299 }
 300
 301 /**
 302 \brief fill sound buffer
 303 \param data pointer to the sound data to copy
 304 \param len length of the data to copy in bytes
 305 \return number of copyed bytes
 306 */
 307 static int write_buffer(unsigned char *data, int len)
 308 {
 309   HRESULT res;
 310   LPVOID lpvPtr1;
 311   DWORD dwBytes1;
 312   LPVOID lpvPtr2;
 313   DWORD dwBytes2;
 314
 315   // Lock the buffer
 316   res = IDirectSoundBuffer_Lock(hdsbuf,write_offset, len, &lpvPtr1, &dwBytes1, &lpvPtr2, &dwBytes2, 0);
 317   // If the buffer was lost, restore and retry lock.
 318   if (DSERR_BUFFERLOST == res)
 319   {
 320     IDirectSoundBuffer_Restore(hdsbuf);
 321         res = IDirectSoundBuffer_Lock(hdsbuf,write_offset, len, &lpvPtr1, &dwBytes1, &lpvPtr2, &dwBytes2, 0);
 322   }
 323
 324
 325   if (SUCCEEDED(res))
 326   {
 327         if( (ao_data.channels == 6) && (ao_data.format!=AF_FORMAT_AC3) ) {
 328             // reorder channels while writing to pointers.
 329             // it's this easy because buffer size and len are always
 330             // aligned to multiples of channels*bytespersample
 331             // there's probably some room for speed improvements here
 332             const int chantable[6] = {0, 1, 4, 5, 2, 3}; // reorder "matrix"
 333             int i, j;
 334             int numsamp,sampsize;
 335
 336             sampsize = af_fmt2bits(ao_data.format)>>3; // bytes per sample
 337             numsamp = dwBytes1 / (ao_data.channels * sampsize);  // number of samples for each channel in this buffer
 338
 339             for( i = 0; i < numsamp; i++ ) for( j = 0; j < ao_data.channels; j++ ) {
 340                 memcpy(lpvPtr1+(i*ao_data.channels*sampsize)+(chantable[j]*sampsize),data+(i*ao_data.channels*sampsize)+(j*sampsize),sampsize);
 341             }
 342
 343             if (NULL != lpvPtr2 )
 344             {
 345                 numsamp = dwBytes2 / (ao_data.channels * sampsize);
 346                 for( i = 0; i < numsamp; i++ ) for( j = 0; j < ao_data.channels; j++ ) {
 347                     memcpy(lpvPtr2+(i*ao_data.channels*sampsize)+(chantable[j]*sampsize),data+dwBytes1+(i*ao_data.channels*sampsize)+(j*sampsize),sampsize);
 348                 }
 349             }
 350
 351             write_offset+=dwBytes1+dwBytes2;
 352             if(write_offset>=buffer_size)write_offset=dwBytes2;
 353         } else {
 354             // Write to pointers without reordering.
 355         memcpy(lpvPtr1,data,dwBytes1);
 356     if (NULL != lpvPtr2 )memcpy(lpvPtr2,data+dwBytes1,dwBytes2);
 357         write_offset+=dwBytes1+dwBytes2;
 358     if(write_offset>=buffer_size)write_offset=dwBytes2;
 359         }
 360
 361    // Release the data back to DirectSound.
 362     res = IDirectSoundBuffer_Unlock(hdsbuf,lpvPtr1,dwBytes1,lpvPtr2,dwBytes2);
 363     if (SUCCEEDED(res))
 364     {
 365           // Success.
 366           DWORD status;
 367           IDirectSoundBuffer_GetStatus(hdsbuf, &status);
 368       if (!(status & DSBSTATUS_PLAYING)){
 369             res = IDirectSoundBuffer_Play(hdsbuf, 0, 0, DSBPLAY_LOOPING);
 370           }
 371           return dwBytes1+dwBytes2;
 372     }
 373   }
 374   // Lock, Unlock, or Restore failed.
 375   return 0;
 376 }
 377
 378 /***************************************************************************************/
 379
 380 /**
 381 \brief handle control commands
 382 \param cmd command
 383 \param arg argument
 384 \return CONTROL_OK or -1 in case the command can't be handled
 385 */
 386 static int control(int cmd, void *arg)
 387 {
 388         DWORD volume;
 389         switch (cmd) {
 390                 case AOCONTROL_GET_VOLUME: {
 391                         ao_control_vol_t* vol = (ao_control_vol_t*)arg;
 392                         IDirectSoundBuffer_GetVolume(hdsbuf, &volume);
 393                         vol->left = vol->right = pow(10.0, (float)(volume+10000) / 5000.0);
 394                         //printf("ao_dsound: volume: %f\n",vol->left);
 395                         return CONTROL_OK;
 396                 }
 397                 case AOCONTROL_SET_VOLUME: {
 398                         ao_control_vol_t* vol = (ao_control_vol_t*)arg;
 399                         volume = (DWORD)(log10(vol->right) * 5000.0) - 10000;
 400                         IDirectSoundBuffer_SetVolume(hdsbuf, volume);
 401                         //printf("ao_dsound: volume: %f\n",vol->left);
 402                         return CONTROL_OK;
 403                 }
 404         }
 405         return -1;
 406 }
 407
 408 /**
 409 \brief setup sound device
 410 \param rate samplerate
 411 \param channels number of channels
 412 \param format format
 413 \param flags unused
 414 \return 1=success 0=fail
 415 */
 416 static int init(int rate, int channels, int format, int flags)
 417 {
 418     int res;
 419         if (!InitDirectSound()) return 0;
 420
 421         // ok, now create the buffers
 422         WAVEFORMATEXTENSIBLE wformat;
 423         DSBUFFERDESC dsbpridesc;
 424         DSBUFFERDESC dsbdesc;
 425
 426         //check if the format is supported in general
 427         switch(format){
 428                 case AF_FORMAT_AC3:
 429                 case AF_FORMAT_S24_LE:
 430                 case AF_FORMAT_S16_LE:
 431                 case AF_FORMAT_S8:
 432                         break;
 433                 default:
 434                         mp_msg(MSGT_AO, MSGL_V,"ao_dsound: format %s not supported defaulting to Signed 16-bit Little-Endian\n",af_fmt2str_short(format));
 435                         format=AF_FORMAT_S16_LE;
 436         }
 437         //fill global ao_data
 438         ao_data.channels = channels;
 439         ao_data.samplerate = rate;
 440         ao_data.format = format;
 441         ao_data.bps = channels * rate * (af_fmt2bits(format)>>3);
 442         if(ao_data.buffersize==-1) ao_data.buffersize = ao_data.bps; // space for 1 sec
 443         mp_msg(MSGT_AO, MSGL_V,"ao_dsound: Samplerate:%iHz Channels:%i Format:%s\n", rate, channels, af_fmt2str_short(format));
 444         mp_msg(MSGT_AO, MSGL_V,"ao_dsound: Buffersize:%d bytes (%d msec)\n", ao_data.buffersize, ao_data.buffersize / ao_data.bps * 1000);
 445
 446         //fill waveformatex
 447         ZeroMemory(&wformat, sizeof(WAVEFORMATEXTENSIBLE));
 448         wformat.Format.cbSize          = (channels > 2) ? sizeof(WAVEFORMATEXTENSIBLE)-sizeof(WAVEFORMATEX) : 0;
 449         wformat.Format.nChannels       = channels;
 450         wformat.Format.nSamplesPerSec  = rate;
 451         if (format == AF_FORMAT_AC3) {
 452                 wformat.Format.wFormatTag      = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 453                 wformat.Format.wBitsPerSample  = 16;
 454                 wformat.Format.nBlockAlign     = 4;
 455         } else {
 456                 wformat.Format.wFormatTag      = (channels > 2) ? WAVE_FORMAT_EXTENSIBLE : WAVE_FORMAT_PCM;
 457                 wformat.Format.wBitsPerSample  = af_fmt2bits(format);
 458                 wformat.Format.nBlockAlign     = wformat.Format.nChannels * (wformat.Format.wBitsPerSample >> 3);
 459         }
 460
 461         // fill in primary sound buffer descriptor
 462         memset(&dsbpridesc, 0, sizeof(DSBUFFERDESC));
 463         dsbpridesc.dwSize = sizeof(DSBUFFERDESC);
 464         dsbpridesc.dwFlags       = DSBCAPS_PRIMARYBUFFER;
 465         dsbpridesc.dwBufferBytes = 0;
 466         dsbpridesc.lpwfxFormat   = NULL;
 467
 468
 469         // fill in the secondary sound buffer (=stream buffer) descriptor
 470         memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 471         dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 472         dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2 /** Better position accuracy */
 473                         | DSBCAPS_GLOBALFOCUS         /** Allows background playing */
 474                         | DSBCAPS_CTRLVOLUME;         /** volume control enabled */
 475
 476         if (channels > 2) {
 477                 wformat.dwChannelMask = channel_mask[channels - 3];
 478                 wformat.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
 479                 wformat.Samples.wValidBitsPerSample = wformat.Format.wBitsPerSample;
 480                 // Needed for 5.1 on emu101k - shit soundblaster
 481                 dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
 482         }
 483         wformat.Format.nAvgBytesPerSec = wformat.Format.nSamplesPerSec * wformat.Format.nBlockAlign;
 484
 485         dsbdesc.dwBufferBytes = ao_data.buffersize;
 486         dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&wformat;
 487         buffer_size = dsbdesc.dwBufferBytes;
 488         write_offset = 0;
 489         min_free_space = wformat.Format.nBlockAlign;
 490         ao_data.outburst = wformat.Format.nBlockAlign * 512;
 491
 492         // create primary buffer and set its format
 493
 494         res = IDirectSound_CreateSoundBuffer( hds, &dsbpridesc, &hdspribuf, NULL );
 495         if ( res != DS_OK ) {
 496                 UninitDirectSound();
 497                 mp_msg(MSGT_AO, MSGL_ERR,"ao_dsound: cannot create primary buffer (%s)\n", dserr2str(res));
 498                 return 0;
 499         }
 500         res = IDirectSoundBuffer_SetFormat( hdspribuf, (WAVEFORMATEX *)&wformat );
 501         if ( res != DS_OK ) mp_msg(MSGT_AO, MSGL_WARN,"ao_dsound: cannot set primary buffer format (%s), using standard setting (bad quality)", dserr2str(res));
 502
 503         mp_msg(MSGT_AO, MSGL_V, "ao_dsound: primary buffer created\n");
 504
 505         // now create the stream buffer
 506
 507         res = IDirectSound_CreateSoundBuffer(hds, &dsbdesc, &hdsbuf, NULL);
 508         if (res != DS_OK) {
 509                 if (dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE) {
 510                         // Try without DSBCAPS_LOCHARDWARE
 511                         dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
 512                         res = IDirectSound_CreateSoundBuffer(hds, &dsbdesc, &hdsbuf, NULL);
 513                 }
 514                 if (res != DS_OK) {
 515                         UninitDirectSound();
 516                         mp_msg(MSGT_AO, MSGL_ERR, "ao_dsound: cannot create secondary (stream)buffer (%s)\n", dserr2str(res));
 517                         return 0;
 518                 }
 519         }
 520         mp_msg(MSGT_AO, MSGL_V, "ao_dsound: secondary (stream)buffer created\n");
 521         return 1;
 522 }
 523
 524
 525
 526 /**
 527 \brief stop playing and empty buffers (for seeking/pause)
 528 */
 529 static void reset(void)
 530 {
 531         IDirectSoundBuffer_Stop(hdsbuf);
 532         // reset directsound buffer
 533         IDirectSoundBuffer_SetCurrentPosition(hdsbuf, 0);
 534         write_offset=0;
 535 }
 536
 537 /**
 538 \brief stop playing, keep buffers (for pause)
 539 */
 540 static void audio_pause(void)
 541 {
 542         IDirectSoundBuffer_Stop(hdsbuf);
 543 }
 544
 545 /**
 546 \brief resume playing, after audio_pause()
 547 */
 548 static void audio_resume(void)
 549 {
 550         IDirectSoundBuffer_Play(hdsbuf, 0, 0, DSBPLAY_LOOPING);
 551 }
 552
 553 /**
 554 \brief close audio device
 555 \param immed stop playback immediately
 556 */
 557 static void uninit(int immed)
 558 {
 559         if(immed)reset();
 560         else{
 561                 DWORD status;
 562                 IDirectSoundBuffer_Play(hdsbuf, 0, 0, 0);
 563                 while(!IDirectSoundBuffer_GetStatus(hdsbuf,&status) && (status&DSBSTATUS_PLAYING))
 564                         usec_sleep(20000);
 565         }
 566         DestroyBuffer();
 567         UninitDirectSound();
 568 }
 569
 570 /**
 571 \brief find out how many bytes can be written into the audio buffer without
 572 \return free space in bytes, has to return 0 if the buffer is almost full
 573 */
 574 static int get_space(void)
 575 {
 576         int space;
 577         DWORD play_offset;
 578         IDirectSoundBuffer_GetCurrentPosition(hdsbuf,&play_offset,NULL);
 579         space=buffer_size-(write_offset-play_offset);
 580         //                |                                                      | <-- const --> |                |                 |
 581         //                buffer start                                           play_cursor     write_cursor     write_offset      buffer end
 582         // play_cursor is the actual postion of the play cursor
 583         // write_cursor is the position after which it is assumed to be save to write data
 584         // write_offset is the postion where we actually write the data to
 585         if(space > buffer_size)space -= buffer_size; // write_offset < play_offset
 586         if(space < min_free_space)return 0;
 587         return space-min_free_space;
 588 }
 589
 590 /**
 591 \brief play 'len' bytes of 'data'
 592 \param data pointer to the data to play
 593 \param len size in bytes of the data buffer, gets rounded down to outburst*n
 594 \param flags currently unused
 595 \return number of played bytes
 596 */
 597 static int play(void* data, int len, int flags)
 598 {
 599         DWORD play_offset;
 600         int space;
 601
 602         // make sure we have enough space to write data
 603         IDirectSoundBuffer_GetCurrentPosition(hdsbuf,&play_offset,NULL);
 604         space=buffer_size-(write_offset-play_offset);
 605         if(space > buffer_size)space -= buffer_size; // write_offset < play_offset
 606         if(space < len) len = space;
 607
 608         len = (len / ao_data.outburst) * ao_data.outburst;
 609         return write_buffer(data, len);
 610 }
 611
 612 /**
 613 \brief get the delay between the first and last sample in the buffer
 614 \return delay in seconds
 615 */
 616 static float get_delay(void)
 617 {
 618         DWORD play_offset;
 619         int space;
 620         IDirectSoundBuffer_GetCurrentPosition(hdsbuf,&play_offset,NULL);
 621         space=play_offset-write_offset;
 622         if(space <= 0)space += buffer_size;
 623         return (float)(buffer_size - space) / (float)ao_data.bps;
 624 }