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authorTimos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>2023-10-10 11:40:56 +0000
committerTimos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>2023-10-10 11:40:56 +0000
commite02cda008591317b1625707ff8e115a4841aa889 (patch)
treeaee302e3cf8b59ec2d32ec481be3d1afddfc8968 /audio/dsoundaudio.c
parentcc668e6b7e0ffd8c9d130513d12053cf5eda1d3b (diff)
Introduce Virtio-loopback epsilon release:
Epsilon release introduces a new compatibility layer which make virtio-loopback design to work with QEMU and rust-vmm vhost-user backend without require any changes. Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com> Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9
Diffstat (limited to 'audio/dsoundaudio.c')
-rw-r--r--audio/dsoundaudio.c732
1 files changed, 732 insertions, 0 deletions
diff --git a/audio/dsoundaudio.c b/audio/dsoundaudio.c
new file mode 100644
index 000000000..cfc79c129
--- /dev/null
+++ b/audio/dsoundaudio.c
@@ -0,0 +1,732 @@
+/*
+ * QEMU DirectSound audio driver
+ *
+ * Copyright (c) 2005 Vassili Karpov (malc)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/*
+ * SEAL 1.07 by Carlos 'pel' Hasan was used as documentation
+ */
+
+#include "qemu/osdep.h"
+#include "audio.h"
+
+#define AUDIO_CAP "dsound"
+#include "audio_int.h"
+#include "qemu/host-utils.h"
+#include "qemu/module.h"
+
+#include <windows.h>
+#include <mmsystem.h>
+#include <objbase.h>
+#include <dsound.h>
+
+#include "audio_win_int.h"
+
+/* #define DEBUG_DSOUND */
+
+typedef struct {
+ LPDIRECTSOUND dsound;
+ LPDIRECTSOUNDCAPTURE dsound_capture;
+ struct audsettings settings;
+ Audiodev *dev;
+} dsound;
+
+typedef struct {
+ HWVoiceOut hw;
+ LPDIRECTSOUNDBUFFER dsound_buffer;
+ bool first_time;
+ dsound *s;
+} DSoundVoiceOut;
+
+typedef struct {
+ HWVoiceIn hw;
+ LPDIRECTSOUNDCAPTUREBUFFER dsound_capture_buffer;
+ bool first_time;
+ dsound *s;
+} DSoundVoiceIn;
+
+static void dsound_log_hresult (HRESULT hr)
+{
+ const char *str = "BUG";
+
+ switch (hr) {
+ case DS_OK:
+ str = "The method succeeded";
+ break;
+#ifdef DS_NO_VIRTUALIZATION
+ case DS_NO_VIRTUALIZATION:
+ str = "The buffer was created, but another 3D algorithm was substituted";
+ break;
+#endif
+#ifdef DS_INCOMPLETE
+ case DS_INCOMPLETE:
+ str = "The method succeeded, but not all the optional effects were obtained";
+ break;
+#endif
+#ifdef DSERR_ACCESSDENIED
+ case DSERR_ACCESSDENIED:
+ str = "The request failed because access was denied";
+ break;
+#endif
+#ifdef DSERR_ALLOCATED
+ case DSERR_ALLOCATED:
+ str = "The request failed because resources, "
+ "such as a priority level, were already in use "
+ "by another caller";
+ break;
+#endif
+#ifdef DSERR_ALREADYINITIALIZED
+ case DSERR_ALREADYINITIALIZED:
+ str = "The object is already initialized";
+ break;
+#endif
+#ifdef DSERR_BADFORMAT
+ case DSERR_BADFORMAT:
+ str = "The specified wave format is not supported";
+ break;
+#endif
+#ifdef DSERR_BADSENDBUFFERGUID
+ case DSERR_BADSENDBUFFERGUID:
+ str = "The GUID specified in an audiopath file "
+ "does not match a valid mix-in buffer";
+ break;
+#endif
+#ifdef DSERR_BUFFERLOST
+ case DSERR_BUFFERLOST:
+ str = "The buffer memory has been lost and must be restored";
+ break;
+#endif
+#ifdef DSERR_BUFFERTOOSMALL
+ case DSERR_BUFFERTOOSMALL:
+ str = "The buffer size is not great enough to "
+ "enable effects processing";
+ break;
+#endif
+#ifdef DSERR_CONTROLUNAVAIL
+ case DSERR_CONTROLUNAVAIL:
+ str = "The buffer control (volume, pan, and so on) "
+ "requested by the caller is not available. "
+ "Controls must be specified when the buffer is created, "
+ "using the dwFlags member of DSBUFFERDESC";
+ break;
+#endif
+#ifdef DSERR_DS8_REQUIRED
+ case DSERR_DS8_REQUIRED:
+ str = "A DirectSound object of class CLSID_DirectSound8 or later "
+ "is required for the requested functionality. "
+ "For more information, see IDirectSound8 Interface";
+ break;
+#endif
+#ifdef DSERR_FXUNAVAILABLE
+ case DSERR_FXUNAVAILABLE:
+ str = "The effects requested could not be found on the system, "
+ "or they are in the wrong order or in the wrong location; "
+ "for example, an effect expected in hardware "
+ "was found in software";
+ break;
+#endif
+#ifdef DSERR_GENERIC
+ case DSERR_GENERIC:
+ str = "An undetermined error occurred inside the DirectSound subsystem";
+ break;
+#endif
+#ifdef DSERR_INVALIDCALL
+ case DSERR_INVALIDCALL:
+ str = "This function is not valid for the current state of this object";
+ break;
+#endif
+#ifdef DSERR_INVALIDPARAM
+ case DSERR_INVALIDPARAM:
+ str = "An invalid parameter was passed to the returning function";
+ break;
+#endif
+#ifdef DSERR_NOAGGREGATION
+ case DSERR_NOAGGREGATION:
+ str = "The object does not support aggregation";
+ break;
+#endif
+#ifdef DSERR_NODRIVER
+ case DSERR_NODRIVER:
+ str = "No sound driver is available for use, "
+ "or the given GUID is not a valid DirectSound device ID";
+ break;
+#endif
+#ifdef DSERR_NOINTERFACE
+ case DSERR_NOINTERFACE:
+ str = "The requested COM interface is not available";
+ break;
+#endif
+#ifdef DSERR_OBJECTNOTFOUND
+ case DSERR_OBJECTNOTFOUND:
+ str = "The requested object was not found";
+ break;
+#endif
+#ifdef DSERR_OTHERAPPHASPRIO
+ case DSERR_OTHERAPPHASPRIO:
+ str = "Another application has a higher priority level, "
+ "preventing this call from succeeding";
+ break;
+#endif
+#ifdef DSERR_OUTOFMEMORY
+ case DSERR_OUTOFMEMORY:
+ str = "The DirectSound subsystem could not allocate "
+ "sufficient memory to complete the caller's request";
+ break;
+#endif
+#ifdef DSERR_PRIOLEVELNEEDED
+ case DSERR_PRIOLEVELNEEDED:
+ str = "A cooperative level of DSSCL_PRIORITY or higher is required";
+ break;
+#endif
+#ifdef DSERR_SENDLOOP
+ case DSERR_SENDLOOP:
+ str = "A circular loop of send effects was detected";
+ break;
+#endif
+#ifdef DSERR_UNINITIALIZED
+ case DSERR_UNINITIALIZED:
+ str = "The Initialize method has not been called "
+ "or has not been called successfully "
+ "before other methods were called";
+ break;
+#endif
+#ifdef DSERR_UNSUPPORTED
+ case DSERR_UNSUPPORTED:
+ str = "The function called is not supported at this time";
+ break;
+#endif
+ default:
+ AUD_log (AUDIO_CAP, "Reason: Unknown (HRESULT 0x%lx)\n", hr);
+ return;
+ }
+
+ AUD_log (AUDIO_CAP, "Reason: %s\n", str);
+}
+
+static void GCC_FMT_ATTR (2, 3) dsound_logerr (
+ HRESULT hr,
+ const char *fmt,
+ ...
+ )
+{
+ va_list ap;
+
+ va_start (ap, fmt);
+ AUD_vlog (AUDIO_CAP, fmt, ap);
+ va_end (ap);
+
+ dsound_log_hresult (hr);
+}
+
+static void GCC_FMT_ATTR (3, 4) dsound_logerr2 (
+ HRESULT hr,
+ const char *typ,
+ const char *fmt,
+ ...
+ )
+{
+ va_list ap;
+
+ AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
+ va_start (ap, fmt);
+ AUD_vlog (AUDIO_CAP, fmt, ap);
+ va_end (ap);
+
+ dsound_log_hresult (hr);
+}
+
+#ifdef DEBUG_DSOUND
+static void print_wave_format (WAVEFORMATEX *wfx)
+{
+ dolog ("tag = %d\n", wfx->wFormatTag);
+ dolog ("nChannels = %d\n", wfx->nChannels);
+ dolog ("nSamplesPerSec = %ld\n", wfx->nSamplesPerSec);
+ dolog ("nAvgBytesPerSec = %ld\n", wfx->nAvgBytesPerSec);
+ dolog ("nBlockAlign = %d\n", wfx->nBlockAlign);
+ dolog ("wBitsPerSample = %d\n", wfx->wBitsPerSample);
+ dolog ("cbSize = %d\n", wfx->cbSize);
+}
+#endif
+
+static int dsound_restore_out (LPDIRECTSOUNDBUFFER dsb, dsound *s)
+{
+ HRESULT hr;
+
+ hr = IDirectSoundBuffer_Restore (dsb);
+
+ if (hr != DS_OK) {
+ dsound_logerr (hr, "Could not restore playback buffer\n");
+ return -1;
+ }
+ return 0;
+}
+
+#include "dsound_template.h"
+#define DSBTYPE_IN
+#include "dsound_template.h"
+#undef DSBTYPE_IN
+
+static int dsound_get_status_out (LPDIRECTSOUNDBUFFER dsb, DWORD *statusp,
+ dsound *s)
+{
+ HRESULT hr;
+
+ hr = IDirectSoundBuffer_GetStatus (dsb, statusp);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not get playback buffer status\n");
+ return -1;
+ }
+
+ if (*statusp & DSBSTATUS_BUFFERLOST) {
+ dsound_restore_out(dsb, s);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int dsound_get_status_in (LPDIRECTSOUNDCAPTUREBUFFER dscb,
+ DWORD *statusp)
+{
+ HRESULT hr;
+
+ hr = IDirectSoundCaptureBuffer_GetStatus (dscb, statusp);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not get capture buffer status\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static void dsound_clear_sample (HWVoiceOut *hw, LPDIRECTSOUNDBUFFER dsb,
+ dsound *s)
+{
+ int err;
+ LPVOID p1, p2;
+ DWORD blen1, blen2, len1, len2;
+
+ err = dsound_lock_out (
+ dsb,
+ &hw->info,
+ 0,
+ hw->size_emul,
+ &p1, &p2,
+ &blen1, &blen2,
+ 1,
+ s
+ );
+ if (err) {
+ return;
+ }
+
+ len1 = blen1 / hw->info.bytes_per_frame;
+ len2 = blen2 / hw->info.bytes_per_frame;
+
+#ifdef DEBUG_DSOUND
+ dolog ("clear %p,%ld,%ld %p,%ld,%ld\n",
+ p1, blen1, len1,
+ p2, blen2, len2);
+#endif
+
+ if (p1 && len1) {
+ audio_pcm_info_clear_buf (&hw->info, p1, len1);
+ }
+
+ if (p2 && len2) {
+ audio_pcm_info_clear_buf (&hw->info, p2, len2);
+ }
+
+ dsound_unlock_out (dsb, p1, p2, blen1, blen2);
+}
+
+static int dsound_set_cooperative_level(dsound *s)
+{
+ HRESULT hr;
+ HWND hwnd;
+
+ hwnd = GetDesktopWindow();
+ hr = IDirectSound_SetCooperativeLevel (
+ s->dsound,
+ hwnd,
+ DSSCL_PRIORITY
+ );
+
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not set cooperative level for window %p\n",
+ hwnd);
+ return -1;
+ }
+
+ return 0;
+}
+
+static void dsound_enable_out(HWVoiceOut *hw, bool enable)
+{
+ HRESULT hr;
+ DWORD status;
+ DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
+ LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
+ dsound *s = ds->s;
+
+ if (!dsb) {
+ dolog ("Attempt to control voice without a buffer\n");
+ return;
+ }
+
+ if (enable) {
+ if (dsound_get_status_out (dsb, &status, s)) {
+ return;
+ }
+
+ if (status & DSBSTATUS_PLAYING) {
+ dolog ("warning: Voice is already playing\n");
+ return;
+ }
+
+ dsound_clear_sample (hw, dsb, s);
+
+ hr = IDirectSoundBuffer_Play (dsb, 0, 0, DSBPLAY_LOOPING);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not start playing buffer\n");
+ return;
+ }
+ } else {
+ if (dsound_get_status_out (dsb, &status, s)) {
+ return;
+ }
+
+ if (status & DSBSTATUS_PLAYING) {
+ hr = IDirectSoundBuffer_Stop (dsb);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not stop playing buffer\n");
+ return;
+ }
+ } else {
+ dolog ("warning: Voice is not playing\n");
+ }
+ }
+}
+
+static void *dsound_get_buffer_out(HWVoiceOut *hw, size_t *size)
+{
+ DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
+ LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
+ HRESULT hr;
+ DWORD ppos, wpos, act_size;
+ size_t req_size;
+ int err;
+ void *ret;
+
+ hr = IDirectSoundBuffer_GetCurrentPosition(
+ dsb, &ppos, ds->first_time ? &wpos : NULL);
+ if (FAILED(hr)) {
+ dsound_logerr(hr, "Could not get playback buffer position\n");
+ *size = 0;
+ return NULL;
+ }
+
+ if (ds->first_time) {
+ hw->pos_emul = wpos;
+ ds->first_time = false;
+ }
+
+ req_size = audio_ring_dist(ppos, hw->pos_emul, hw->size_emul);
+ req_size = MIN(req_size, hw->size_emul - hw->pos_emul);
+
+ if (req_size == 0) {
+ *size = 0;
+ return NULL;
+ }
+
+ err = dsound_lock_out(dsb, &hw->info, hw->pos_emul, req_size, &ret, NULL,
+ &act_size, NULL, false, ds->s);
+ if (err) {
+ dolog("Failed to lock buffer\n");
+ *size = 0;
+ return NULL;
+ }
+
+ *size = act_size;
+ return ret;
+}
+
+static size_t dsound_put_buffer_out(HWVoiceOut *hw, void *buf, size_t len)
+{
+ DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
+ LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
+ int err = dsound_unlock_out(dsb, buf, NULL, len, 0);
+
+ if (err) {
+ dolog("Failed to unlock buffer!!\n");
+ return 0;
+ }
+ hw->pos_emul = (hw->pos_emul + len) % hw->size_emul;
+
+ return len;
+}
+
+static void dsound_enable_in(HWVoiceIn *hw, bool enable)
+{
+ HRESULT hr;
+ DWORD status;
+ DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
+ LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
+
+ if (!dscb) {
+ dolog ("Attempt to control capture voice without a buffer\n");
+ return;
+ }
+
+ if (enable) {
+ if (dsound_get_status_in (dscb, &status)) {
+ return;
+ }
+
+ if (status & DSCBSTATUS_CAPTURING) {
+ dolog ("warning: Voice is already capturing\n");
+ return;
+ }
+
+ /* clear ?? */
+
+ hr = IDirectSoundCaptureBuffer_Start (dscb, DSCBSTART_LOOPING);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not start capturing\n");
+ return;
+ }
+ } else {
+ if (dsound_get_status_in (dscb, &status)) {
+ return;
+ }
+
+ if (status & DSCBSTATUS_CAPTURING) {
+ hr = IDirectSoundCaptureBuffer_Stop (dscb);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not stop capturing\n");
+ return;
+ }
+ } else {
+ dolog ("warning: Voice is not capturing\n");
+ }
+ }
+}
+
+static void *dsound_get_buffer_in(HWVoiceIn *hw, size_t *size)
+{
+ DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
+ LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
+ HRESULT hr;
+ DWORD cpos, rpos, act_size;
+ size_t req_size;
+ int err;
+ void *ret;
+
+ hr = IDirectSoundCaptureBuffer_GetCurrentPosition(
+ dscb, &cpos, ds->first_time ? &rpos : NULL);
+ if (FAILED(hr)) {
+ dsound_logerr(hr, "Could not get capture buffer position\n");
+ *size = 0;
+ return NULL;
+ }
+
+ if (ds->first_time) {
+ hw->pos_emul = rpos;
+ ds->first_time = false;
+ }
+
+ req_size = audio_ring_dist(cpos, hw->pos_emul, hw->size_emul);
+ req_size = MIN(*size, MIN(req_size, hw->size_emul - hw->pos_emul));
+
+ if (req_size == 0) {
+ *size = 0;
+ return NULL;
+ }
+
+ err = dsound_lock_in(dscb, &hw->info, hw->pos_emul, req_size, &ret, NULL,
+ &act_size, NULL, false, ds->s);
+ if (err) {
+ dolog("Failed to lock buffer\n");
+ *size = 0;
+ return NULL;
+ }
+
+ *size = act_size;
+ return ret;
+}
+
+static void dsound_put_buffer_in(HWVoiceIn *hw, void *buf, size_t len)
+{
+ DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
+ LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
+ int err = dsound_unlock_in(dscb, buf, NULL, len, 0);
+
+ if (err) {
+ dolog("Failed to unlock buffer!!\n");
+ return;
+ }
+ hw->pos_emul = (hw->pos_emul + len) % hw->size_emul;
+}
+
+static void dsound_audio_fini (void *opaque)
+{
+ HRESULT hr;
+ dsound *s = opaque;
+
+ if (!s->dsound) {
+ g_free(s);
+ return;
+ }
+
+ hr = IDirectSound_Release (s->dsound);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not release DirectSound\n");
+ }
+ s->dsound = NULL;
+
+ if (!s->dsound_capture) {
+ g_free(s);
+ return;
+ }
+
+ hr = IDirectSoundCapture_Release (s->dsound_capture);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not release DirectSoundCapture\n");
+ }
+ s->dsound_capture = NULL;
+
+ g_free(s);
+}
+
+static void *dsound_audio_init(Audiodev *dev)
+{
+ int err;
+ HRESULT hr;
+ dsound *s = g_malloc0(sizeof(dsound));
+ AudiodevDsoundOptions *dso;
+
+ assert(dev->driver == AUDIODEV_DRIVER_DSOUND);
+ s->dev = dev;
+ dso = &dev->u.dsound;
+
+ if (!dso->has_latency) {
+ dso->has_latency = true;
+ dso->latency = 10000; /* 10 ms */
+ }
+
+ hr = CoInitialize (NULL);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not initialize COM\n");
+ g_free(s);
+ return NULL;
+ }
+
+ hr = CoCreateInstance (
+ &CLSID_DirectSound,
+ NULL,
+ CLSCTX_ALL,
+ &IID_IDirectSound,
+ (void **) &s->dsound
+ );
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not create DirectSound instance\n");
+ g_free(s);
+ return NULL;
+ }
+
+ hr = IDirectSound_Initialize (s->dsound, NULL);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not initialize DirectSound\n");
+
+ hr = IDirectSound_Release (s->dsound);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not release DirectSound\n");
+ }
+ g_free(s);
+ return NULL;
+ }
+
+ hr = CoCreateInstance (
+ &CLSID_DirectSoundCapture,
+ NULL,
+ CLSCTX_ALL,
+ &IID_IDirectSoundCapture,
+ (void **) &s->dsound_capture
+ );
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not create DirectSoundCapture instance\n");
+ } else {
+ hr = IDirectSoundCapture_Initialize (s->dsound_capture, NULL);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not initialize DirectSoundCapture\n");
+
+ hr = IDirectSoundCapture_Release (s->dsound_capture);
+ if (FAILED (hr)) {
+ dsound_logerr (hr, "Could not release DirectSoundCapture\n");
+ }
+ s->dsound_capture = NULL;
+ }
+ }
+
+ err = dsound_set_cooperative_level(s);
+ if (err) {
+ dsound_audio_fini (s);
+ return NULL;
+ }
+
+ return s;
+}
+
+static struct audio_pcm_ops dsound_pcm_ops = {
+ .init_out = dsound_init_out,
+ .fini_out = dsound_fini_out,
+ .write = audio_generic_write,
+ .get_buffer_out = dsound_get_buffer_out,
+ .put_buffer_out = dsound_put_buffer_out,
+ .enable_out = dsound_enable_out,
+
+ .init_in = dsound_init_in,
+ .fini_in = dsound_fini_in,
+ .read = audio_generic_read,
+ .get_buffer_in = dsound_get_buffer_in,
+ .put_buffer_in = dsound_put_buffer_in,
+ .enable_in = dsound_enable_in,
+};
+
+static struct audio_driver dsound_audio_driver = {
+ .name = "dsound",
+ .descr = "DirectSound http://wikipedia.org/wiki/DirectSound",
+ .init = dsound_audio_init,
+ .fini = dsound_audio_fini,
+ .pcm_ops = &dsound_pcm_ops,
+ .can_be_default = 1,
+ .max_voices_out = INT_MAX,
+ .max_voices_in = 1,
+ .voice_size_out = sizeof (DSoundVoiceOut),
+ .voice_size_in = sizeof (DSoundVoiceIn)
+};
+
+static void register_audio_dsound(void)
+{
+ audio_driver_register(&dsound_audio_driver);
+}
+type_init(register_audio_dsound);