modules/audio_output/wasapi.c

   1 /*****************************************************************************
   2  * wasapi.c : Windows Audio Session API output plugin for VLC
   3  *****************************************************************************
   4  * Copyright (C) 2012 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #if !defined(_WIN32_WINNT) || _WIN32_WINNT < _WIN32_WINNT_VISTA
  22 # undef _WIN32_WINNT
  23 # define _WIN32_WINNT _WIN32_WINNT_VISTA
  24 #endif
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include <config.h>
  28 #endif
  29
  30 #define INITGUID
  31 #define COBJMACROS
  32 #define CONST_VTABLE
  33 #define NONEWWAVE
  34
  35 #include <stdlib.h>
  36 #include <assert.h>
  37
  38 #include <vlc_common.h>
  39 #include <vlc_codecs.h>
  40 #include <vlc_aout.h>
  41 #include <vlc_plugin.h>
  42
  43 #include <audioclient.h>
  44 #include "audio_output/mmdevice.h"
  45
  46 /* 00000092-0000-0010-8000-00aa00389b71 */
  47 DEFINE_GUID(_KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_DIGITAL,
  48             WAVE_FORMAT_DOLBY_AC3_SPDIF, 0x0000, 0x0010, 0x80, 0x00,
  49             0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
  50
  51 /* 00000008-0000-0010-8000-00aa00389b71 */
  52 DEFINE_GUID(_KSDATAFORMAT_SUBTYPE_IEC61937_DTS,
  53             WAVE_FORMAT_DTS_MS, 0x0000, 0x0010, 0x80, 0x00,
  54             0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
  55
  56 /* 0000000b-0cea-0010-8000-00aa00389b71 */
  57 DEFINE_GUID(_KSDATAFORMAT_SUBTYPE_IEC61937_DTS_HD,
  58             0x000b, 0x0cea, 0x0010, 0x80, 0x00,
  59             0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
  60
  61 /* 0000000a-0cea-0010-8000-00aa00389b71 */
  62 DEFINE_GUID(_KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_DIGITAL_PLUS,
  63             0x000a, 0x0cea, 0x0010, 0x80, 0x00,
  64             0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
  65
  66 /* 0000000c-0cea-0010-8000-00aa00389b71 */
  67 DEFINE_GUID(_KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_MLP,
  68             0x000c, 0x0cea, 0x0010, 0x80, 0x00,
  69             0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
  70
  71 static BOOL CALLBACK InitFreq(INIT_ONCE *once, void *param, void **context)
  72 {
  73     (void) once; (void) context;
  74     return QueryPerformanceFrequency(param);
  75 }
  76
  77 static LARGE_INTEGER freq; /* performance counters frequency */
  78
  79 static UINT64 GetQPC(void)
  80 {
  81     LARGE_INTEGER counter;
  82
  83     if (!QueryPerformanceCounter(&counter))
  84         abort();
  85
  86     lldiv_t d = lldiv(counter.QuadPart, freq.QuadPart);
  87     return (d.quot * 10000000) + ((d.rem * 10000000) / freq.QuadPart);
  88 }
  89
  90 typedef struct aout_stream_sys
  91 {
  92     IAudioClient *client;
  93
  94     uint8_t chans_table[AOUT_CHAN_MAX];
  95     uint8_t chans_to_reorder;
  96
  97     vlc_fourcc_t format; /**< Sample format */
  98     unsigned rate; /**< Sample rate */
  99     unsigned block_align;
 100     UINT64 written; /**< Frames written to the buffer */
 101     UINT32 frames; /**< Total buffer size (frames) */
 102 } aout_stream_sys_t;
 103
 104
 105 /*** VLC audio output callbacks ***/
 106 static HRESULT TimeGet(aout_stream_t *s, mtime_t *restrict delay)
 107 {
 108     aout_stream_sys_t *sys = s->sys;
 109     void *pv;
 110     UINT64 pos, qpcpos, freq;
 111     HRESULT hr;
 112
 113     hr = IAudioClient_GetService(sys->client, &IID_IAudioClock, &pv);
 114     if (FAILED(hr))
 115     {
 116         msg_Err(s, "cannot get clock (error 0x%lx)", hr);
 117         return hr;
 118     }
 119
 120     IAudioClock *clock = pv;
 121
 122     hr = IAudioClock_GetPosition(clock, &pos, &qpcpos);
 123     if (SUCCEEDED(hr))
 124         hr = IAudioClock_GetFrequency(clock, &freq);
 125     IAudioClock_Release(clock);
 126     if (FAILED(hr))
 127     {
 128         msg_Err(s, "cannot get position (error 0x%lx)", hr);
 129         return hr;
 130     }
 131
 132     lldiv_t w = lldiv(sys->written, sys->rate);
 133     lldiv_t r = lldiv(pos, freq);
 134
 135     static_assert((10000000 % CLOCK_FREQ) == 0, "Frequency conversion broken");
 136
 137     *delay = ((w.quot - r.quot) * CLOCK_FREQ)
 138            + ((w.rem * CLOCK_FREQ) / sys->rate)
 139            - ((r.rem * CLOCK_FREQ) / freq)
 140            - ((GetQPC() - qpcpos) / (10000000 / CLOCK_FREQ));
 141
 142     return hr;
 143 }
 144
 145 static HRESULT Play(aout_stream_t *s, block_t *block)
 146 {
 147     aout_stream_sys_t *sys = s->sys;
 148     void *pv;
 149     HRESULT hr;
 150
 151     if (sys->chans_to_reorder)
 152         aout_ChannelReorder(block->p_buffer, block->i_buffer,
 153                           sys->chans_to_reorder, sys->chans_table, sys->format);
 154
 155     hr = IAudioClient_GetService(sys->client, &IID_IAudioRenderClient, &pv);
 156     if (FAILED(hr))
 157     {
 158         msg_Err(s, "cannot get render client (error 0x%lx)", hr);
 159         goto out;
 160     }
 161
 162     IAudioRenderClient *render = pv;
 163     for (;;)
 164     {
 165         UINT32 frames;
 166         hr = IAudioClient_GetCurrentPadding(sys->client, &frames);
 167         if (FAILED(hr))
 168         {
 169             msg_Err(s, "cannot get current padding (error 0x%lx)", hr);
 170             break;
 171         }
 172
 173         assert(frames <= sys->frames);
 174         frames = sys->frames - frames;
 175         if (frames > block->i_nb_samples)
 176             frames = block->i_nb_samples;
 177
 178         BYTE *dst;
 179         hr = IAudioRenderClient_GetBuffer(render, frames, &dst);
 180         if (FAILED(hr))
 181         {
 182             msg_Err(s, "cannot get buffer (error 0x%lx)", hr);
 183             break;
 184         }
 185
 186         const size_t copy = frames * sys->block_align;
 187
 188         memcpy(dst, block->p_buffer, copy);
 189         hr = IAudioRenderClient_ReleaseBuffer(render, frames, 0);
 190         if (FAILED(hr))
 191         {
 192             msg_Err(s, "cannot release buffer (error 0x%lx)", hr);
 193             break;
 194         }
 195         IAudioClient_Start(sys->client);
 196
 197         block->p_buffer += copy;
 198         block->i_buffer -= copy;
 199         block->i_nb_samples -= frames;
 200         sys->written += frames;
 201         if (block->i_nb_samples == 0)
 202             break; /* done */
 203
 204         /* Out of buffer space, sleep */
 205         msleep(sys->frames * (CLOCK_FREQ / 2) / sys->rate);
 206     }
 207     IAudioRenderClient_Release(render);
 208 out:
 209     block_Release(block);
 210
 211     return hr;
 212 }
 213
 214 static HRESULT Pause(aout_stream_t *s, bool paused)
 215 {
 216     aout_stream_sys_t *sys = s->sys;
 217     HRESULT hr;
 218
 219     if (paused)
 220         hr = IAudioClient_Stop(sys->client);
 221     else
 222         hr = IAudioClient_Start(sys->client);
 223     if (FAILED(hr))
 224         msg_Warn(s, "cannot %s stream (error 0x%lx)",
 225                  paused ? "stop" : "start", hr);
 226     return hr;
 227 }
 228
 229 static HRESULT Flush(aout_stream_t *s)
 230 {
 231     aout_stream_sys_t *sys = s->sys;
 232     HRESULT hr;
 233
 234     IAudioClient_Stop(sys->client);
 235
 236     hr = IAudioClient_Reset(sys->client);
 237     if (SUCCEEDED(hr))
 238     {
 239         msg_Dbg(s, "reset");
 240         sys->written = 0;
 241     }
 242     else
 243         msg_Warn(s, "cannot reset stream (error 0x%lx)", hr);
 244     return hr;
 245 }
 246
 247
 248 /*** Initialization / deinitialization **/
 249 static const uint32_t chans_out[] = {
 250     SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 251     SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY,
 252     SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT, SPEAKER_BACK_CENTER,
 253     SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT, 0
 254 };
 255 static const uint32_t chans_in[] = {
 256     SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 257     SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT,
 258     SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT, SPEAKER_BACK_CENTER,
 259     SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY, 0
 260 };
 261
 262 static void vlc_HdmiToWave(WAVEFORMATEXTENSIBLE_IEC61937 *restrict wf_iec61937,
 263                            audio_sample_format_t *restrict audio)
 264 {
 265     WAVEFORMATEXTENSIBLE *wf = &wf_iec61937->FormatExt;
 266
 267     switch (audio->i_format)
 268     {
 269     case VLC_CODEC_DTS:
 270         wf->SubFormat = _KSDATAFORMAT_SUBTYPE_IEC61937_DTS_HD;
 271         wf->Format.nChannels = 8;
 272         wf->dwChannelMask = KSAUDIO_SPEAKER_7POINT1;
 273         audio->i_rate = 768000;
 274         break;
 275     case VLC_CODEC_EAC3:
 276         wf->SubFormat = _KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_DIGITAL_PLUS;
 277         wf->Format.nChannels = 2;
 278         wf->dwChannelMask = KSAUDIO_SPEAKER_5POINT1;
 279         break;
 280     case VLC_CODEC_TRUEHD:
 281     case VLC_CODEC_MLP:
 282         wf->SubFormat = _KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_MLP;
 283         wf->Format.nChannels = 8;
 284         wf->dwChannelMask = KSAUDIO_SPEAKER_7POINT1;
 285         audio->i_rate = 768000;
 286         break;
 287     default:
 288         vlc_assert_unreachable();
 289     }
 290     wf->Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 291     wf->Format.nSamplesPerSec = 192000;
 292     wf->Format.wBitsPerSample = 16;
 293     wf->Format.nBlockAlign = wf->Format.wBitsPerSample / 8 * wf->Format.nChannels;
 294     wf->Format.nAvgBytesPerSec = wf->Format.nSamplesPerSec * wf->Format.nBlockAlign;
 295     wf->Format.cbSize = sizeof (*wf_iec61937) - sizeof (wf->Format);
 296
 297     wf->Samples.wValidBitsPerSample = wf->Format.wBitsPerSample;
 298
 299     wf_iec61937->dwEncodedSamplesPerSec = audio->i_rate;
 300     wf_iec61937->dwEncodedChannelCount = audio->i_channels;
 301     wf_iec61937->dwAverageBytesPerSec = 0;
 302
 303     audio->i_format = VLC_CODEC_SPDIFL;
 304     audio->i_bytes_per_frame = wf->Format.nBlockAlign;
 305     audio->i_frame_length = 1;
 306 }
 307
 308 static void vlc_SpdifToWave(WAVEFORMATEXTENSIBLE *restrict wf,
 309                             audio_sample_format_t *restrict audio)
 310 {
 311     switch (audio->i_format)
 312     {
 313     case VLC_CODEC_DTS:
 314         wf->SubFormat = _KSDATAFORMAT_SUBTYPE_IEC61937_DTS;
 315         break;
 316     case VLC_CODEC_SPDIFL:
 317     case VLC_CODEC_SPDIFB:
 318     case VLC_CODEC_A52:
 319         wf->SubFormat = _KSDATAFORMAT_SUBTYPE_IEC61937_DOLBY_DIGITAL;
 320         break;
 321     default:
 322         vlc_assert_unreachable();
 323     }
 324
 325     wf->Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 326     wf->Format.nChannels = 2; /* To prevent channel re-ordering */
 327     wf->Format.nSamplesPerSec = audio->i_rate;
 328     wf->Format.wBitsPerSample = 16;
 329     wf->Format.nBlockAlign = 4; /* wf->Format.wBitsPerSample / 8 * wf->Format.nChannels  */
 330     wf->Format.nAvgBytesPerSec = wf->Format.nSamplesPerSec * wf->Format.nBlockAlign;
 331     wf->Format.cbSize = sizeof (*wf) - sizeof (wf->Format);
 332
 333     wf->Samples.wValidBitsPerSample = wf->Format.wBitsPerSample;
 334
 335     wf->dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 336
 337     audio->i_format = VLC_CODEC_SPDIFL;
 338     audio->i_bytes_per_frame = wf->Format.nBlockAlign;
 339     audio->i_frame_length = 1;
 340 }
 341
 342 static void vlc_ToWave(WAVEFORMATEXTENSIBLE *restrict wf,
 343                        audio_sample_format_t *restrict audio)
 344 {
 345     switch (audio->i_format)
 346     {
 347         case VLC_CODEC_FL64:
 348             audio->i_format = VLC_CODEC_FL32;
 349         case VLC_CODEC_FL32:
 350             wf->SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 351             break;
 352
 353         case VLC_CODEC_U8:
 354             audio->i_format = VLC_CODEC_S16N;
 355         case VLC_CODEC_S16N:
 356             wf->SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
 357             break;
 358
 359         default:
 360             audio->i_format = VLC_CODEC_FL32;
 361             wf->SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 362             break;
 363     }
 364     aout_FormatPrepare (audio);
 365
 366     wf->Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 367     wf->Format.nChannels = audio->i_channels;
 368     wf->Format.nSamplesPerSec = audio->i_rate;
 369     wf->Format.nAvgBytesPerSec = audio->i_bytes_per_frame * audio->i_rate;
 370     wf->Format.nBlockAlign = audio->i_bytes_per_frame;
 371     wf->Format.wBitsPerSample = audio->i_bitspersample;
 372     wf->Format.cbSize = sizeof (*wf) - sizeof (wf->Format);
 373
 374     wf->Samples.wValidBitsPerSample = audio->i_bitspersample;
 375
 376     wf->dwChannelMask = 0;
 377     for (unsigned i = 0; pi_vlc_chan_order_wg4[i]; i++)
 378         if (audio->i_physical_channels & pi_vlc_chan_order_wg4[i])
 379             wf->dwChannelMask |= chans_in[i];
 380 }
 381
 382 static int vlc_FromWave(const WAVEFORMATEX *restrict wf,
 383                         audio_sample_format_t *restrict audio)
 384 {
 385     audio->i_rate = wf->nSamplesPerSec;
 386     audio->i_physical_channels = 0;
 387
 388     if (wf->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
 389     {
 390         const WAVEFORMATEXTENSIBLE *wfe = (void *)wf;
 391
 392         if (IsEqualIID(&wfe->SubFormat, &KSDATAFORMAT_SUBTYPE_IEEE_FLOAT))
 393         {
 394             switch (wf->wBitsPerSample)
 395             {
 396                 case 64:
 397                     audio->i_format = VLC_CODEC_FL64;
 398                     break;
 399                 case 32:
 400                     audio->i_format = VLC_CODEC_FL32;
 401                     break;
 402                 default:
 403                     return -1;
 404             }
 405         }
 406         else if (IsEqualIID(&wfe->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))
 407         {
 408             switch (wf->wBitsPerSample)
 409             {
 410                 case 32:
 411                     audio->i_format = VLC_CODEC_S32N;
 412                     break;
 413                 case 16:
 414                     audio->i_format = VLC_CODEC_S16N;
 415                     break;
 416                 default:
 417                     return -1;
 418             }
 419         }
 420
 421         if (wfe->Samples.wValidBitsPerSample != wf->wBitsPerSample)
 422             return -1;
 423
 424         for (unsigned i = 0; chans_in[i]; i++)
 425             if (wfe->dwChannelMask & chans_in[i])
 426                 audio->i_physical_channels |= pi_vlc_chan_order_wg4[i];
 427     }
 428     else
 429         return -1;
 430
 431     aout_FormatPrepare (audio);
 432
 433     if (wf->nChannels != audio->i_channels)
 434         return -1;
 435     return 0;
 436 }
 437
 438 static unsigned vlc_CheckWaveOrder (const WAVEFORMATEX *restrict wf,
 439                                     uint8_t *restrict table)
 440 {
 441     uint32_t mask = 0;
 442
 443     if (wf->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
 444     {
 445         const WAVEFORMATEXTENSIBLE *wfe = (void *)wf;
 446
 447         mask = wfe->dwChannelMask;
 448     }
 449     return aout_CheckChannelReorder(chans_in, chans_out, mask, table);
 450 }
 451
 452
 453 static HRESULT Restart(aout_stream_t *s, audio_sample_format_t *restrict pfmt,
 454                        const GUID *sid, bool force_dts_spdif)
 455 {
 456     static INIT_ONCE freq_once = INIT_ONCE_STATIC_INIT;
 457
 458     if (!InitOnceExecuteOnce(&freq_once, InitFreq, &freq, NULL))
 459         return E_FAIL;
 460
 461     aout_stream_sys_t *sys = malloc(sizeof (*sys));
 462     if (unlikely(sys == NULL))
 463         return E_OUTOFMEMORY;
 464     sys->client = NULL;
 465
 466     /* Configure audio stream */
 467     WAVEFORMATEXTENSIBLE_IEC61937 wf_iec61937;
 468     WAVEFORMATEXTENSIBLE *pwfe = &wf_iec61937.FormatExt;
 469     WAVEFORMATEX *pwf = &pwfe->Format, *pwf_closest, *pwf_mix = NULL;
 470     AUDCLNT_SHAREMODE shared_mode;
 471     REFERENCE_TIME buffer_duration;
 472     audio_sample_format_t fmt = *pfmt;
 473     bool b_spdif = AOUT_FMT_SPDIF(&fmt);
 474     bool b_hdmi = AOUT_FMT_HDMI(&fmt);
 475
 476     void *pv;
 477     HRESULT hr = aout_stream_Activate(s, &IID_IAudioClient, NULL, &pv);
 478     if (FAILED(hr))
 479     {
 480         msg_Err(s, "cannot activate client (error 0x%lx)", hr);
 481         goto error;
 482     }
 483     sys->client = pv;
 484
 485     if (b_spdif && !b_hdmi && fmt.i_format == VLC_CODEC_DTS && !force_dts_spdif
 486      && fmt.i_rate >= 48000)
 487     {
 488         /* Try to configure the output rate (IEC958 rate) at 768kHz. Indeed,
 489          * DTS-HD (and other DTS extensions like DTS-X) can only be transmitted
 490          * at 768kHz. We'll also be able to transmit DTS-Core only at this
 491          * rate. */
 492         b_spdif = false;
 493         b_hdmi = true;
 494     }
 495
 496     if (b_spdif)
 497     {
 498         vlc_SpdifToWave(pwfe, &fmt);
 499         shared_mode = AUDCLNT_SHAREMODE_EXCLUSIVE;
 500         /* The max buffer duration in exclusive mode is 2 seconds */
 501         buffer_duration = AOUT_MAX_PREPARE_TIME;
 502     }
 503     else if (b_hdmi)
 504     {
 505         vlc_HdmiToWave(&wf_iec61937, &fmt);
 506         shared_mode = AUDCLNT_SHAREMODE_EXCLUSIVE;
 507         /* The max buffer duration in exclusive mode is 2 seconds */
 508         buffer_duration = AOUT_MAX_PREPARE_TIME;
 509     }
 510     else if (AOUT_FMT_LINEAR(&fmt))
 511     {
 512         shared_mode = AUDCLNT_SHAREMODE_SHARED;
 513
 514         if (fmt.channel_type == AUDIO_CHANNEL_TYPE_AMBISONICS)
 515         {
 516             fmt.channel_type = AUDIO_CHANNEL_TYPE_BITMAP;
 517
 518             /* Render Ambisonics on the native mix format */
 519             hr = IAudioClient_GetMixFormat(sys->client, &pwf_mix);
 520             if (FAILED(hr) || vlc_FromWave(pwf_mix, &fmt))
 521                 vlc_ToWave(pwfe, &fmt); /* failed, fallback to default */
 522             else
 523                 pwf = pwf_mix;
 524
 525             /* Setup low latency in order to quickly react to ambisonics filters
 526              * viewpoint changes. */
 527             buffer_duration = AOUT_MIN_PREPARE_TIME;
 528         }
 529         else
 530         {
 531             vlc_ToWave(pwfe, &fmt);
 532             buffer_duration = AOUT_MAX_PREPARE_TIME * 10;
 533         }
 534     }
 535     else
 536     {
 537         hr = E_FAIL;
 538         goto error;
 539     }
 540
 541     hr = IAudioClient_IsFormatSupported(sys->client, shared_mode,
 542                                         pwf, &pwf_closest);
 543
 544     if (FAILED(hr))
 545     {
 546         if (pfmt->i_format == VLC_CODEC_DTS && b_hdmi)
 547         {
 548             msg_Warn(s, "cannot negotiate DTS at 768khz IEC958 rate (HDMI), "
 549                      "fallback to 48kHz (S/PDIF)");
 550             IAudioClient_Release(sys->client);
 551             free(sys);
 552             return Restart(s, pfmt, sid, true);
 553         }
 554         msg_Err(s, "cannot negotiate audio format (error 0x%lx)%s", hr,
 555                 hr == AUDCLNT_E_UNSUPPORTED_FORMAT
 556                 && fmt.i_format == VLC_CODEC_SPDIFL ?
 557                 ": digital pass-through not supported" : "");
 558         goto error;
 559     }
 560
 561     if (hr == S_FALSE)
 562     {
 563         assert(pwf_closest != NULL);
 564         if (vlc_FromWave(pwf_closest, &fmt))
 565         {
 566             CoTaskMemFree(pwf_closest);
 567             msg_Err(s, "unsupported audio format");
 568             hr = E_INVALIDARG;
 569             goto error;
 570         }
 571         shared_mode = AUDCLNT_SHAREMODE_SHARED;
 572         msg_Dbg(s, "modified format");
 573         pwf = pwf_closest;
 574     }
 575     else
 576         assert(pwf_closest == NULL);
 577
 578     sys->chans_to_reorder = fmt.i_format != VLC_CODEC_SPDIFL ?
 579                             vlc_CheckWaveOrder(pwf, sys->chans_table) : 0;
 580     sys->format = fmt.i_format;
 581     sys->block_align = pwf->nBlockAlign;
 582     sys->rate = pwf->nSamplesPerSec;
 583
 584     hr = IAudioClient_Initialize(sys->client, shared_mode, 0, buffer_duration,
 585                                  0, pwf, sid);
 586     CoTaskMemFree(pwf_closest);
 587     if (FAILED(hr))
 588     {
 589         msg_Err(s, "cannot initialize audio client (error 0x%lx)", hr);
 590         goto error;
 591     }
 592
 593     hr = IAudioClient_GetBufferSize(sys->client, &sys->frames);
 594     if (FAILED(hr))
 595     {
 596         msg_Err(s, "cannot get buffer size (error 0x%lx)", hr);
 597         goto error;
 598     }
 599     msg_Dbg(s, "buffer size    : %"PRIu32" frames", sys->frames);
 600
 601     REFERENCE_TIME latT, defT, minT;
 602     if (SUCCEEDED(IAudioClient_GetStreamLatency(sys->client, &latT))
 603      && SUCCEEDED(IAudioClient_GetDevicePeriod(sys->client, &defT, &minT)))
 604     {
 605         msg_Dbg(s, "maximum latency: %"PRIu64"00 ns", latT);
 606         msg_Dbg(s, "default period : %"PRIu64"00 ns", defT);
 607         msg_Dbg(s, "minimum period : %"PRIu64"00 ns", minT);
 608     }
 609
 610     CoTaskMemFree(pwf_mix);
 611     *pfmt = fmt;
 612     sys->written = 0;
 613     s->sys = sys;
 614     s->time_get = TimeGet;
 615     s->play = Play;
 616     s->pause = Pause;
 617     s->flush = Flush;
 618     return S_OK;
 619 error:
 620     CoTaskMemFree(pwf_mix);
 621     if (sys->client != NULL)
 622         IAudioClient_Release(sys->client);
 623     free(sys);
 624     return hr;
 625 }
 626
 627 static HRESULT Start(aout_stream_t *s, audio_sample_format_t *restrict pfmt,
 628                      const GUID *sid)
 629 {
 630     return Restart(s, pfmt, sid, false);
 631 }
 632
 633 static void Stop(aout_stream_t *s)
 634 {
 635     aout_stream_sys_t *sys = s->sys;
 636
 637     IAudioClient_Stop(sys->client); /* should not be needed */
 638     IAudioClient_Release(sys->client);
 639
 640     free(sys);
 641 }
 642
 643 vlc_module_begin()
 644     set_shortname("WASAPI")
 645     set_description(N_("Windows Audio Session API output"))
 646     set_capability("aout stream", 50)
 647     set_category(CAT_AUDIO)
 648     set_subcategory(SUBCAT_AUDIO_AOUT)
 649     set_callbacks(Start, Stop)
 650 vlc_module_end()