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hydrogendeuteride
2025-10-10 22:53:54 +09:00
commit 8853429937
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622
third_party/SDL/src/audio/wasapi/SDL_wasapi.c vendored Normal file
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if SDL_AUDIO_DRIVER_WASAPI
#include "../../core/windows/SDL_windows.h"
#include "../../core/windows/SDL_immdevice.h"
#include "SDL_audio.h"
#include "SDL_timer.h"
#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
#define COBJMACROS
#include <audioclient.h>
#include "SDL_wasapi.h"
/* These constants aren't available in older SDKs */
#ifndef AUDCLNT_STREAMFLAGS_RATEADJUST
#define AUDCLNT_STREAMFLAGS_RATEADJUST 0x00100000
#endif
#ifndef AUDCLNT_STREAMFLAGS_SRC_DEFAULT_QUALITY
#define AUDCLNT_STREAMFLAGS_SRC_DEFAULT_QUALITY 0x08000000
#endif
#ifndef AUDCLNT_STREAMFLAGS_AUTOCONVERTPCM
#define AUDCLNT_STREAMFLAGS_AUTOCONVERTPCM 0x80000000
#endif
/* Some GUIDs we need to know without linking to libraries that aren't available before Vista. */
static const IID SDL_IID_IAudioRenderClient = { 0xf294acfc, 0x3146, 0x4483, { 0xa7, 0xbf, 0xad, 0xdc, 0xa7, 0xc2, 0x60, 0xe2 } };
static const IID SDL_IID_IAudioCaptureClient = { 0xc8adbd64, 0xe71e, 0x48a0, { 0xa4, 0xde, 0x18, 0x5c, 0x39, 0x5c, 0xd3, 0x17 } };
static void WASAPI_DetectDevices(void)
{
WASAPI_EnumerateEndpoints();
}
static SDL_INLINE SDL_bool WasapiFailed(_THIS, const HRESULT err)
{
if (err == S_OK) {
return SDL_FALSE;
}
if (err == AUDCLNT_E_DEVICE_INVALIDATED) {
this->hidden->device_lost = SDL_TRUE;
} else if (SDL_AtomicGet(&this->enabled)) {
IAudioClient_Stop(this->hidden->client);
SDL_OpenedAudioDeviceDisconnected(this);
SDL_assert(!SDL_AtomicGet(&this->enabled));
}
return SDL_TRUE;
}
static int UpdateAudioStream(_THIS, const SDL_AudioSpec *oldspec)
{
/* Since WASAPI requires us to handle all audio conversion, and our
device format might have changed, we might have to add/remove/change
the audio stream that the higher level uses to convert data, so
SDL keeps firing the callback as if nothing happened here. */
if ((this->callbackspec.channels == this->spec.channels) &&
(this->callbackspec.format == this->spec.format) &&
(this->callbackspec.freq == this->spec.freq) &&
(this->callbackspec.samples == this->spec.samples)) {
/* no need to buffer/convert in an AudioStream! */
SDL_FreeAudioStream(this->stream);
this->stream = NULL;
} else if ((oldspec->channels == this->spec.channels) &&
(oldspec->format == this->spec.format) &&
(oldspec->freq == this->spec.freq)) {
/* The existing audio stream is okay to keep using. */
} else {
/* replace the audiostream for new format */
SDL_FreeAudioStream(this->stream);
if (this->iscapture) {
this->stream = SDL_NewAudioStream(this->spec.format,
this->spec.channels, this->spec.freq,
this->callbackspec.format,
this->callbackspec.channels,
this->callbackspec.freq);
} else {
this->stream = SDL_NewAudioStream(this->callbackspec.format,
this->callbackspec.channels,
this->callbackspec.freq, this->spec.format,
this->spec.channels, this->spec.freq);
}
if (!this->stream) {
return -1; /* SDL_NewAudioStream should have called SDL_SetError. */
}
}
/* make sure our scratch buffer can cover the new device spec. */
if (this->spec.size > this->work_buffer_len) {
Uint8 *ptr = (Uint8 *)SDL_realloc(this->work_buffer, this->spec.size);
if (ptr == NULL) {
return SDL_OutOfMemory();
}
this->work_buffer = ptr;
this->work_buffer_len = this->spec.size;
}
return 0;
}
static void ReleaseWasapiDevice(_THIS);
static SDL_bool RecoverWasapiDevice(_THIS)
{
ReleaseWasapiDevice(this); /* dump the lost device's handles. */
if (this->hidden->default_device_generation) {
this->hidden->default_device_generation = SDL_AtomicGet(this->iscapture ? &SDL_IMMDevice_DefaultCaptureGeneration : &SDL_IMMDevice_DefaultPlaybackGeneration);
}
/* this can fail for lots of reasons, but the most likely is we had a
non-default device that was disconnected, so we can't recover. Default
devices try to reinitialize whatever the new default is, so it's more
likely to carry on here, but this handles a non-default device that
simply had its format changed in the Windows Control Panel. */
if (WASAPI_ActivateDevice(this, SDL_TRUE) == -1) {
SDL_OpenedAudioDeviceDisconnected(this);
return SDL_FALSE;
}
this->hidden->device_lost = SDL_FALSE;
return SDL_TRUE; /* okay, carry on with new device details! */
}
static SDL_bool RecoverWasapiIfLost(_THIS)
{
const int generation = this->hidden->default_device_generation;
SDL_bool lost = this->hidden->device_lost;
if (!SDL_AtomicGet(&this->enabled)) {
return SDL_FALSE; /* already failed. */
}
if (!this->hidden->client) {
return SDL_TRUE; /* still waiting for activation. */
}
if (!lost && (generation > 0)) { /* is a default device? */
const int newgen = SDL_AtomicGet(this->iscapture ? &SDL_IMMDevice_DefaultCaptureGeneration : &SDL_IMMDevice_DefaultPlaybackGeneration);
if (generation != newgen) { /* the desired default device was changed, jump over to it. */
lost = SDL_TRUE;
}
}
return lost ? RecoverWasapiDevice(this) : SDL_TRUE;
}
static Uint8 *WASAPI_GetDeviceBuf(_THIS)
{
/* get an endpoint buffer from WASAPI. */
BYTE *buffer = NULL;
while (RecoverWasapiIfLost(this) && this->hidden->render) {
if (!WasapiFailed(this, IAudioRenderClient_GetBuffer(this->hidden->render, this->spec.samples, &buffer))) {
return (Uint8 *)buffer;
}
SDL_assert(buffer == NULL);
}
return (Uint8 *)buffer;
}
static void WASAPI_PlayDevice(_THIS)
{
if (this->hidden->render != NULL) { /* definitely activated? */
/* WasapiFailed() will mark the device for reacquisition or removal elsewhere. */
WasapiFailed(this, IAudioRenderClient_ReleaseBuffer(this->hidden->render, this->spec.samples, 0));
}
}
static void WASAPI_WaitDevice(_THIS)
{
while (RecoverWasapiIfLost(this) && this->hidden->client && this->hidden->event) {
DWORD waitResult = WaitForSingleObjectEx(this->hidden->event, 200, FALSE);
if (waitResult == WAIT_OBJECT_0) {
const UINT32 maxpadding = this->spec.samples;
UINT32 padding = 0;
if (!WasapiFailed(this, IAudioClient_GetCurrentPadding(this->hidden->client, &padding))) {
/*SDL_Log("WASAPI EVENT! padding=%u maxpadding=%u", (unsigned int)padding, (unsigned int)maxpadding);*/
if (this->iscapture) {
if (padding > 0) {
break;
}
} else {
if (padding <= maxpadding) {
break;
}
}
}
} else if (waitResult != WAIT_TIMEOUT) {
/*SDL_Log("WASAPI FAILED EVENT!");*/
IAudioClient_Stop(this->hidden->client);
SDL_OpenedAudioDeviceDisconnected(this);
}
}
}
static int WASAPI_CaptureFromDevice(_THIS, void *buffer, int buflen)
{
SDL_AudioStream *stream = this->hidden->capturestream;
const int avail = SDL_AudioStreamAvailable(stream);
if (avail > 0) {
const int cpy = SDL_min(buflen, avail);
SDL_AudioStreamGet(stream, buffer, cpy);
return cpy;
}
while (RecoverWasapiIfLost(this)) {
HRESULT ret;
BYTE *ptr = NULL;
UINT32 frames = 0;
DWORD flags = 0;
/* uhoh, client isn't activated yet, just return silence. */
if (!this->hidden->capture) {
/* Delay so we run at about the speed that audio would be arriving. */
SDL_Delay(((this->spec.samples * 1000) / this->spec.freq));
SDL_memset(buffer, this->spec.silence, buflen);
return buflen;
}
ret = IAudioCaptureClient_GetBuffer(this->hidden->capture, &ptr, &frames, &flags, NULL, NULL);
if (ret != AUDCLNT_S_BUFFER_EMPTY) {
WasapiFailed(this, ret); /* mark device lost/failed if necessary. */
}
if ((ret == AUDCLNT_S_BUFFER_EMPTY) || !frames) {
WASAPI_WaitDevice(this);
} else if (ret == S_OK) {
const int total = ((int)frames) * this->hidden->framesize;
const int cpy = SDL_min(buflen, total);
const int leftover = total - cpy;
const SDL_bool silent = (flags & AUDCLNT_BUFFERFLAGS_SILENT) ? SDL_TRUE : SDL_FALSE;
if (silent) {
SDL_memset(buffer, this->spec.silence, cpy);
} else {
SDL_memcpy(buffer, ptr, cpy);
}
if (leftover > 0) {
ptr += cpy;
if (silent) {
SDL_memset(ptr, this->spec.silence, leftover); /* I guess this is safe? */
}
if (SDL_AudioStreamPut(stream, ptr, leftover) == -1) {
return -1; /* uhoh, out of memory, etc. Kill device. :( */
}
}
ret = IAudioCaptureClient_ReleaseBuffer(this->hidden->capture, frames);
WasapiFailed(this, ret); /* mark device lost/failed if necessary. */
return cpy;
}
}
return -1; /* unrecoverable error. */
}
static void WASAPI_FlushCapture(_THIS)
{
BYTE *ptr = NULL;
UINT32 frames = 0;
DWORD flags = 0;
if (!this->hidden->capture) {
return; /* not activated yet? */
}
/* just read until we stop getting packets, throwing them away. */
while (SDL_TRUE) {
const HRESULT ret = IAudioCaptureClient_GetBuffer(this->hidden->capture, &ptr, &frames, &flags, NULL, NULL);
if (ret == AUDCLNT_S_BUFFER_EMPTY) {
break; /* no more buffered data; we're done. */
} else if (WasapiFailed(this, ret)) {
break; /* failed for some other reason, abort. */
} else if (WasapiFailed(this, IAudioCaptureClient_ReleaseBuffer(this->hidden->capture, frames))) {
break; /* something broke. */
}
}
SDL_AudioStreamClear(this->hidden->capturestream);
}
static void ReleaseWasapiDevice(_THIS)
{
if (this->hidden->client) {
IAudioClient_Stop(this->hidden->client);
IAudioClient_Release(this->hidden->client);
this->hidden->client = NULL;
}
if (this->hidden->render) {
IAudioRenderClient_Release(this->hidden->render);
this->hidden->render = NULL;
}
if (this->hidden->capture) {
IAudioCaptureClient_Release(this->hidden->capture);
this->hidden->capture = NULL;
}
if (this->hidden->waveformat) {
CoTaskMemFree(this->hidden->waveformat);
this->hidden->waveformat = NULL;
}
if (this->hidden->capturestream) {
SDL_FreeAudioStream(this->hidden->capturestream);
this->hidden->capturestream = NULL;
}
if (this->hidden->activation_handler) {
WASAPI_PlatformDeleteActivationHandler(this->hidden->activation_handler);
this->hidden->activation_handler = NULL;
}
if (this->hidden->event) {
CloseHandle(this->hidden->event);
this->hidden->event = NULL;
}
}
static void WASAPI_CloseDevice(_THIS)
{
WASAPI_UnrefDevice(this);
}
void WASAPI_RefDevice(_THIS)
{
SDL_AtomicIncRef(&this->hidden->refcount);
}
void WASAPI_UnrefDevice(_THIS)
{
if (!SDL_AtomicDecRef(&this->hidden->refcount)) {
return;
}
/* actual closing happens here. */
/* don't touch this->hidden->task in here; it has to be reverted from
our callback thread. We do that in WASAPI_ThreadDeinit().
(likewise for this->hidden->coinitialized). */
ReleaseWasapiDevice(this);
if (SDL_ThreadID() == this->hidden->open_threadid) {
WIN_CoUninitialize(); /* if you closed from a different thread than you opened, sorry, it's a leak. We can't help you. */
}
SDL_free(this->hidden->devid);
SDL_free(this->hidden);
}
/* This is called once a device is activated, possibly asynchronously. */
int WASAPI_PrepDevice(_THIS, const SDL_bool updatestream)
{
/* !!! FIXME: we could request an exclusive mode stream, which is lower latency;
!!! it will write into the kernel's audio buffer directly instead of
!!! shared memory that a user-mode mixer then writes to the kernel with
!!! everything else. Doing this means any other sound using this device will
!!! stop playing, including the user's MP3 player and system notification
!!! sounds. You'd probably need to release the device when the app isn't in
!!! the foreground, to be a good citizen of the system. It's doable, but it's
!!! more work and causes some annoyances, and I don't know what the latency
!!! wins actually look like. Maybe add a hint to force exclusive mode at
!!! some point. To be sure, defaulting to shared mode is the right thing to
!!! do in any case. */
const SDL_AudioSpec oldspec = this->spec;
const AUDCLNT_SHAREMODE sharemode = AUDCLNT_SHAREMODE_SHARED;
UINT32 bufsize = 0; /* this is in sample frames, not samples, not bytes. */
REFERENCE_TIME default_period = 0;
IAudioClient *client = this->hidden->client;
IAudioRenderClient *render = NULL;
IAudioCaptureClient *capture = NULL;
WAVEFORMATEX *waveformat = NULL;
SDL_AudioFormat test_format;
SDL_AudioFormat wasapi_format = 0;
HRESULT ret = S_OK;
DWORD streamflags = 0;
SDL_assert(client != NULL);
#if defined(__WINRT__) || defined(__GDK__) /* CreateEventEx() arrived in Vista, so we need an #ifdef for XP. */
this->hidden->event = CreateEventEx(NULL, NULL, 0, EVENT_ALL_ACCESS);
#else
this->hidden->event = CreateEventW(NULL, 0, 0, NULL);
#endif
if (this->hidden->event == NULL) {
return WIN_SetError("WASAPI can't create an event handle");
}
ret = IAudioClient_GetMixFormat(client, &waveformat);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't determine mix format", ret);
}
SDL_assert(waveformat != NULL);
this->hidden->waveformat = waveformat;
this->spec.channels = (Uint8)waveformat->nChannels;
/* Make sure we have a valid format that we can convert to whatever WASAPI wants. */
wasapi_format = WaveFormatToSDLFormat(waveformat);
for (test_format = SDL_FirstAudioFormat(this->spec.format); test_format; test_format = SDL_NextAudioFormat()) {
if (test_format == wasapi_format) {
this->spec.format = test_format;
break;
}
}
if (!test_format) {
return SDL_SetError("%s: Unsupported audio format", "wasapi");
}
ret = IAudioClient_GetDevicePeriod(client, &default_period, NULL);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't determine minimum device period", ret);
}
/* we've gotten reports that WASAPI's resampler introduces distortions, but in the short term
it fixes some other WASAPI-specific quirks we haven't quite tracked down.
Refer to bug #6326 for the immediate concern. */
#if 0
this->spec.freq = waveformat->nSamplesPerSec; /* force sampling rate so our resampler kicks in, if necessary. */
#else
/* favor WASAPI's resampler over our own */
if (this->spec.freq != waveformat->nSamplesPerSec) {
streamflags |= (AUDCLNT_STREAMFLAGS_AUTOCONVERTPCM | AUDCLNT_STREAMFLAGS_SRC_DEFAULT_QUALITY);
waveformat->nSamplesPerSec = this->spec.freq;
waveformat->nAvgBytesPerSec = waveformat->nSamplesPerSec * waveformat->nChannels * (waveformat->wBitsPerSample / 8);
}
#endif
streamflags |= AUDCLNT_STREAMFLAGS_EVENTCALLBACK;
ret = IAudioClient_Initialize(client, sharemode, streamflags, 0, 0, waveformat, NULL);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't initialize audio client", ret);
}
ret = IAudioClient_SetEventHandle(client, this->hidden->event);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't set event handle", ret);
}
ret = IAudioClient_GetBufferSize(client, &bufsize);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't determine buffer size", ret);
}
/* Match the callback size to the period size to cut down on the number of
interrupts waited for in each call to WaitDevice */
{
const float period_millis = default_period / 10000.0f;
const float period_frames = period_millis * this->spec.freq / 1000.0f;
this->spec.samples = (Uint16)SDL_ceilf(period_frames);
}
/* Update the fragment size as size in bytes */
SDL_CalculateAudioSpec(&this->spec);
this->hidden->framesize = (SDL_AUDIO_BITSIZE(this->spec.format) / 8) * this->spec.channels;
if (this->iscapture) {
this->hidden->capturestream = SDL_NewAudioStream(this->spec.format, this->spec.channels, this->spec.freq, this->spec.format, this->spec.channels, this->spec.freq);
if (!this->hidden->capturestream) {
return -1; /* already set SDL_Error */
}
ret = IAudioClient_GetService(client, &SDL_IID_IAudioCaptureClient, (void **)&capture);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't get capture client service", ret);
}
SDL_assert(capture != NULL);
this->hidden->capture = capture;
ret = IAudioClient_Start(client);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't start capture", ret);
}
WASAPI_FlushCapture(this); /* MSDN says you should flush capture endpoint right after startup. */
} else {
ret = IAudioClient_GetService(client, &SDL_IID_IAudioRenderClient, (void **)&render);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't get render client service", ret);
}
SDL_assert(render != NULL);
this->hidden->render = render;
ret = IAudioClient_Start(client);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't start playback", ret);
}
}
if (updatestream) {
return UpdateAudioStream(this, &oldspec);
}
return 0; /* good to go. */
}
static int WASAPI_OpenDevice(_THIS, const char *devname)
{
LPCWSTR devid = (LPCWSTR)this->handle;
/* Initialize all variables that we clean on shutdown */
this->hidden = (struct SDL_PrivateAudioData *) SDL_malloc(sizeof(*this->hidden));
if (this->hidden == NULL) {
return SDL_OutOfMemory();
}
SDL_zerop(this->hidden);
WASAPI_RefDevice(this); /* so CloseDevice() will unref to zero. */
if (FAILED(WIN_CoInitialize())) { /* WASAPI uses COM, we need to make sure it's initialized. You have to close the device from the same thread!! */
return SDL_SetError("WIN_CoInitialize failed during WASAPI device open");
}
this->hidden->open_threadid = SDL_ThreadID(); /* set this _after_ coinitialize so we don't uninit if device fails at the wrong moment. */
if (!devid) { /* is default device? */
this->hidden->default_device_generation = SDL_AtomicGet(this->iscapture ? &SDL_IMMDevice_DefaultCaptureGeneration : &SDL_IMMDevice_DefaultPlaybackGeneration);
} else {
this->hidden->devid = SDL_wcsdup(devid);
if (!this->hidden->devid) {
return SDL_OutOfMemory();
}
}
if (WASAPI_ActivateDevice(this, SDL_FALSE) == -1) {
return -1; /* already set error. */
}
/* Ready, but waiting for async device activation.
Until activation is successful, we will report silence from capture
devices and ignore data on playback devices.
Also, since we don't know the _actual_ device format until after
activation, we let the app have whatever it asks for. We set up
an SDL_AudioStream to convert, if necessary, once the activation
completes. */
return 0;
}
static void WASAPI_ThreadInit(_THIS)
{
WASAPI_PlatformThreadInit(this);
}
static void WASAPI_ThreadDeinit(_THIS)
{
WASAPI_PlatformThreadDeinit(this);
}
static void WASAPI_Deinitialize(void)
{
WASAPI_PlatformDeinit();
}
static SDL_bool WASAPI_Init(SDL_AudioDriverImpl *impl)
{
if (WASAPI_PlatformInit() == -1) {
return SDL_FALSE;
}
/* Set the function pointers */
impl->DetectDevices = WASAPI_DetectDevices;
impl->ThreadInit = WASAPI_ThreadInit;
impl->ThreadDeinit = WASAPI_ThreadDeinit;
impl->OpenDevice = WASAPI_OpenDevice;
impl->PlayDevice = WASAPI_PlayDevice;
impl->WaitDevice = WASAPI_WaitDevice;
impl->GetDeviceBuf = WASAPI_GetDeviceBuf;
impl->CaptureFromDevice = WASAPI_CaptureFromDevice;
impl->FlushCapture = WASAPI_FlushCapture;
impl->CloseDevice = WASAPI_CloseDevice;
impl->Deinitialize = WASAPI_Deinitialize;
impl->GetDefaultAudioInfo = WASAPI_GetDefaultAudioInfo;
impl->HasCaptureSupport = SDL_TRUE;
impl->SupportsNonPow2Samples = SDL_TRUE;
return SDL_TRUE; /* this audio target is available. */
}
AudioBootStrap WASAPI_bootstrap = {
"wasapi", "WASAPI", WASAPI_Init, SDL_FALSE
};
#endif /* SDL_AUDIO_DRIVER_WASAPI */
/* vi: set ts=4 sw=4 expandtab: */

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/*
Simple DirectMedia Layer
Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#ifndef SDL_wasapi_h_
#define SDL_wasapi_h_
#ifdef __cplusplus
extern "C" {
#endif
#include "../SDL_sysaudio.h"
/* Hidden "this" pointer for the audio functions */
#ifdef __cplusplus
#define _THIS SDL_AudioDevice *_this
#else
#define _THIS SDL_AudioDevice *this
#endif
struct SDL_PrivateAudioData
{
SDL_atomic_t refcount;
WCHAR *devid;
WAVEFORMATEX *waveformat;
IAudioClient *client;
IAudioRenderClient *render;
IAudioCaptureClient *capture;
SDL_AudioStream *capturestream;
HANDLE event;
HANDLE task;
SDL_threadID open_threadid;
SDL_bool coinitialized;
int framesize;
int default_device_generation;
SDL_bool device_lost;
void *activation_handler;
SDL_atomic_t just_activated;
};
/* win32 and winrt implementations call into these. */
int WASAPI_PrepDevice(_THIS, const SDL_bool updatestream);
void WASAPI_RefDevice(_THIS);
void WASAPI_UnrefDevice(_THIS);
/* These are functions that are implemented differently for Windows vs WinRT. */
int WASAPI_PlatformInit(void);
void WASAPI_PlatformDeinit(void);
void WASAPI_EnumerateEndpoints(void);
int WASAPI_GetDefaultAudioInfo(char **name, SDL_AudioSpec *spec, int iscapture);
int WASAPI_ActivateDevice(_THIS, const SDL_bool isrecovery);
void WASAPI_PlatformThreadInit(_THIS);
void WASAPI_PlatformThreadDeinit(_THIS);
void WASAPI_PlatformDeleteActivationHandler(void *handler);
#ifdef __cplusplus
}
#endif
#endif /* SDL_wasapi_h_ */
/* vi: set ts=4 sw=4 expandtab: */

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/*
Simple DirectMedia Layer
Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
/* This is code that Windows uses to talk to WASAPI-related system APIs.
This is for non-WinRT desktop apps. The C++/CX implementation of these
functions, exclusive to WinRT, are in SDL_wasapi_winrt.cpp.
The code in SDL_wasapi.c is used by both standard Windows and WinRT builds
to deal with audio and calls into these functions. */
#if SDL_AUDIO_DRIVER_WASAPI && !defined(__WINRT__)
#include "../../core/windows/SDL_windows.h"
#include "../../core/windows/SDL_immdevice.h"
#include "SDL_audio.h"
#include "SDL_timer.h"
#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
#include <audioclient.h>
#include "SDL_wasapi.h"
/* handle to Avrt.dll--Vista and later!--for flagging the callback thread as "Pro Audio" (low latency). */
static HMODULE libavrt = NULL;
typedef HANDLE(WINAPI *pfnAvSetMmThreadCharacteristicsW)(LPCWSTR, LPDWORD);
typedef BOOL(WINAPI *pfnAvRevertMmThreadCharacteristics)(HANDLE);
static pfnAvSetMmThreadCharacteristicsW pAvSetMmThreadCharacteristicsW = NULL;
static pfnAvRevertMmThreadCharacteristics pAvRevertMmThreadCharacteristics = NULL;
/* Some GUIDs we need to know without linking to libraries that aren't available before Vista. */
static const IID SDL_IID_IAudioClient = { 0x1cb9ad4c, 0xdbfa, 0x4c32, { 0xb1, 0x78, 0xc2, 0xf5, 0x68, 0xa7, 0x03, 0xb2 } };
int WASAPI_PlatformInit(void)
{
if (SDL_IMMDevice_Init() < 0) {
return -1; /* This is set by SDL_IMMDevice_Init */
}
libavrt = LoadLibrary(TEXT("avrt.dll")); /* this library is available in Vista and later. No WinXP, so have to LoadLibrary to use it for now! */
if (libavrt) {
pAvSetMmThreadCharacteristicsW = (pfnAvSetMmThreadCharacteristicsW)GetProcAddress(libavrt, "AvSetMmThreadCharacteristicsW");
pAvRevertMmThreadCharacteristics = (pfnAvRevertMmThreadCharacteristics)GetProcAddress(libavrt, "AvRevertMmThreadCharacteristics");
}
return 0;
}
void WASAPI_PlatformDeinit(void)
{
if (libavrt) {
FreeLibrary(libavrt);
libavrt = NULL;
}
pAvSetMmThreadCharacteristicsW = NULL;
pAvRevertMmThreadCharacteristics = NULL;
SDL_IMMDevice_Quit();
}
void WASAPI_PlatformThreadInit(_THIS)
{
/* this thread uses COM. */
if (SUCCEEDED(WIN_CoInitialize())) { /* can't report errors, hope it worked! */
this->hidden->coinitialized = SDL_TRUE;
}
/* Set this thread to very high "Pro Audio" priority. */
if (pAvSetMmThreadCharacteristicsW) {
DWORD idx = 0;
this->hidden->task = pAvSetMmThreadCharacteristicsW(L"Pro Audio", &idx);
}
}
void WASAPI_PlatformThreadDeinit(_THIS)
{
/* Set this thread back to normal priority. */
if (this->hidden->task && pAvRevertMmThreadCharacteristics) {
pAvRevertMmThreadCharacteristics(this->hidden->task);
this->hidden->task = NULL;
}
if (this->hidden->coinitialized) {
WIN_CoUninitialize();
this->hidden->coinitialized = SDL_FALSE;
}
}
int WASAPI_ActivateDevice(_THIS, const SDL_bool isrecovery)
{
IMMDevice *device = NULL;
HRESULT ret;
if (SDL_IMMDevice_Get(this->hidden->devid, &device, this->iscapture) < 0) {
this->hidden->client = NULL;
return -1; /* This is already set by SDL_IMMDevice_Get */
}
/* this is not async in standard win32, yay! */
ret = IMMDevice_Activate(device, &SDL_IID_IAudioClient, CLSCTX_ALL, NULL, (void **)&this->hidden->client);
IMMDevice_Release(device);
if (FAILED(ret)) {
SDL_assert(this->hidden->client == NULL);
return WIN_SetErrorFromHRESULT("WASAPI can't activate audio endpoint", ret);
}
SDL_assert(this->hidden->client != NULL);
if (WASAPI_PrepDevice(this, isrecovery) == -1) { /* not async, fire it right away. */
return -1;
}
return 0; /* good to go. */
}
void WASAPI_EnumerateEndpoints(void)
{
SDL_IMMDevice_EnumerateEndpoints(SDL_FALSE);
}
int WASAPI_GetDefaultAudioInfo(char **name, SDL_AudioSpec *spec, int iscapture)
{
return SDL_IMMDevice_GetDefaultAudioInfo(name, spec, iscapture);
}
void WASAPI_PlatformDeleteActivationHandler(void *handler)
{
/* not asynchronous. */
SDL_assert(!"This function should have only been called on WinRT.");
}
#endif /* SDL_AUDIO_DRIVER_WASAPI && !defined(__WINRT__) */
/* vi: set ts=4 sw=4 expandtab: */

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third_party/SDL/src/audio/wasapi/SDL_wasapi_winrt.cpp vendored Normal file
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@@ -0,0 +1,431 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
// This is C++/CX code that the WinRT port uses to talk to WASAPI-related
// system APIs. The C implementation of these functions, for non-WinRT apps,
// is in SDL_wasapi_win32.c. The code in SDL_wasapi.c is used by both standard
// Windows and WinRT builds to deal with audio and calls into these functions.
#if SDL_AUDIO_DRIVER_WASAPI && defined(__WINRT__)
#include <Windows.h>
#include <windows.ui.core.h>
#include <windows.devices.enumeration.h>
#include <windows.media.devices.h>
#include <wrl/implements.h>
#include <collection.h>
extern "C" {
#include "../../core/windows/SDL_windows.h"
#include "SDL_audio.h"
#include "SDL_timer.h"
#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
}
#define COBJMACROS
#include <mmdeviceapi.h>
#include <audioclient.h>
#include "SDL_wasapi.h"
using namespace Windows::Devices::Enumeration;
using namespace Windows::Media::Devices;
using namespace Windows::Foundation;
using namespace Microsoft::WRL;
static Platform::String ^ SDL_PKEY_AudioEngine_DeviceFormat = L"{f19f064d-082c-4e27-bc73-6882a1bb8e4c} 0";
static void WASAPI_AddDevice(const SDL_bool iscapture, const char *devname, WAVEFORMATEXTENSIBLE *fmt, LPCWSTR devid);
static void WASAPI_RemoveDevice(const SDL_bool iscapture, LPCWSTR devid);
extern "C" {
SDL_atomic_t SDL_IMMDevice_DefaultPlaybackGeneration;
SDL_atomic_t SDL_IMMDevice_DefaultCaptureGeneration;
}
/* This is a list of device id strings we have inflight, so we have consistent pointers to the same device. */
typedef struct DevIdList
{
WCHAR *str;
struct DevIdList *next;
} DevIdList;
static DevIdList *deviceid_list = NULL;
class SDL_WasapiDeviceEventHandler
{
public:
SDL_WasapiDeviceEventHandler(const SDL_bool _iscapture);
~SDL_WasapiDeviceEventHandler();
void OnDeviceAdded(DeviceWatcher ^ sender, DeviceInformation ^ args);
void OnDeviceRemoved(DeviceWatcher ^ sender, DeviceInformationUpdate ^ args);
void OnDeviceUpdated(DeviceWatcher ^ sender, DeviceInformationUpdate ^ args);
void OnEnumerationCompleted(DeviceWatcher ^ sender, Platform::Object ^ args);
void OnDefaultRenderDeviceChanged(Platform::Object ^ sender, DefaultAudioRenderDeviceChangedEventArgs ^ args);
void OnDefaultCaptureDeviceChanged(Platform::Object ^ sender, DefaultAudioCaptureDeviceChangedEventArgs ^ args);
SDL_semaphore *completed;
private:
const SDL_bool iscapture;
DeviceWatcher ^ watcher;
Windows::Foundation::EventRegistrationToken added_handler;
Windows::Foundation::EventRegistrationToken removed_handler;
Windows::Foundation::EventRegistrationToken updated_handler;
Windows::Foundation::EventRegistrationToken completed_handler;
Windows::Foundation::EventRegistrationToken default_changed_handler;
};
SDL_WasapiDeviceEventHandler::SDL_WasapiDeviceEventHandler(const SDL_bool _iscapture)
: iscapture(_iscapture), completed(SDL_CreateSemaphore(0))
{
if (!completed)
return; // uhoh.
Platform::String ^ selector = _iscapture ? MediaDevice::GetAudioCaptureSelector() : MediaDevice::GetAudioRenderSelector();
Platform::Collections::Vector<Platform::String ^> properties;
properties.Append(SDL_PKEY_AudioEngine_DeviceFormat);
watcher = DeviceInformation::CreateWatcher(selector, properties.GetView());
if (!watcher)
return; // uhoh.
// !!! FIXME: this doesn't need a lambda here, I think, if I make SDL_WasapiDeviceEventHandler a proper C++/CX class. --ryan.
added_handler = watcher->Added += ref new TypedEventHandler<DeviceWatcher ^, DeviceInformation ^>([this](DeviceWatcher ^ sender, DeviceInformation ^ args) { OnDeviceAdded(sender, args); });
removed_handler = watcher->Removed += ref new TypedEventHandler<DeviceWatcher ^, DeviceInformationUpdate ^>([this](DeviceWatcher ^ sender, DeviceInformationUpdate ^ args) { OnDeviceRemoved(sender, args); });
updated_handler = watcher->Updated += ref new TypedEventHandler<DeviceWatcher ^, DeviceInformationUpdate ^>([this](DeviceWatcher ^ sender, DeviceInformationUpdate ^ args) { OnDeviceUpdated(sender, args); });
completed_handler = watcher->EnumerationCompleted += ref new TypedEventHandler<DeviceWatcher ^, Platform::Object ^>([this](DeviceWatcher ^ sender, Platform::Object ^ args) { OnEnumerationCompleted(sender, args); });
if (iscapture) {
default_changed_handler = MediaDevice::DefaultAudioCaptureDeviceChanged += ref new TypedEventHandler<Platform::Object ^, DefaultAudioCaptureDeviceChangedEventArgs ^>([this](Platform::Object ^ sender, DefaultAudioCaptureDeviceChangedEventArgs ^ args) { OnDefaultCaptureDeviceChanged(sender, args); });
} else {
default_changed_handler = MediaDevice::DefaultAudioRenderDeviceChanged += ref new TypedEventHandler<Platform::Object ^, DefaultAudioRenderDeviceChangedEventArgs ^>([this](Platform::Object ^ sender, DefaultAudioRenderDeviceChangedEventArgs ^ args) { OnDefaultRenderDeviceChanged(sender, args); });
}
watcher->Start();
}
SDL_WasapiDeviceEventHandler::~SDL_WasapiDeviceEventHandler()
{
if (watcher) {
watcher->Added -= added_handler;
watcher->Removed -= removed_handler;
watcher->Updated -= updated_handler;
watcher->EnumerationCompleted -= completed_handler;
watcher->Stop();
watcher = nullptr;
}
if (completed) {
SDL_DestroySemaphore(completed);
completed = nullptr;
}
if (iscapture) {
MediaDevice::DefaultAudioCaptureDeviceChanged -= default_changed_handler;
} else {
MediaDevice::DefaultAudioRenderDeviceChanged -= default_changed_handler;
}
}
void SDL_WasapiDeviceEventHandler::OnDeviceAdded(DeviceWatcher ^ sender, DeviceInformation ^ info)
{
SDL_assert(sender == this->watcher);
char *utf8dev = WIN_StringToUTF8(info->Name->Data());
if (utf8dev) {
WAVEFORMATEXTENSIBLE fmt;
Platform::Object ^ obj = info->Properties->Lookup(SDL_PKEY_AudioEngine_DeviceFormat);
if (obj) {
IPropertyValue ^ property = (IPropertyValue ^) obj;
Platform::Array<unsigned char> ^ data;
property->GetUInt8Array(&data);
SDL_memcpy(&fmt, data->Data, SDL_min(data->Length, sizeof(WAVEFORMATEXTENSIBLE)));
} else {
SDL_zero(fmt);
}
WASAPI_AddDevice(this->iscapture, utf8dev, &fmt, info->Id->Data());
SDL_free(utf8dev);
}
}
void SDL_WasapiDeviceEventHandler::OnDeviceRemoved(DeviceWatcher ^ sender, DeviceInformationUpdate ^ info)
{
SDL_assert(sender == this->watcher);
WASAPI_RemoveDevice(this->iscapture, info->Id->Data());
}
void SDL_WasapiDeviceEventHandler::OnDeviceUpdated(DeviceWatcher ^ sender, DeviceInformationUpdate ^ args)
{
SDL_assert(sender == this->watcher);
}
void SDL_WasapiDeviceEventHandler::OnEnumerationCompleted(DeviceWatcher ^ sender, Platform::Object ^ args)
{
SDL_assert(sender == this->watcher);
SDL_SemPost(this->completed);
}
void SDL_WasapiDeviceEventHandler::OnDefaultRenderDeviceChanged(Platform::Object ^ sender, DefaultAudioRenderDeviceChangedEventArgs ^ args)
{
SDL_assert(!this->iscapture);
SDL_AtomicAdd(&SDL_IMMDevice_DefaultPlaybackGeneration, 1);
}
void SDL_WasapiDeviceEventHandler::OnDefaultCaptureDeviceChanged(Platform::Object ^ sender, DefaultAudioCaptureDeviceChangedEventArgs ^ args)
{
SDL_assert(this->iscapture);
SDL_AtomicAdd(&SDL_IMMDevice_DefaultCaptureGeneration, 1);
}
static SDL_WasapiDeviceEventHandler *playback_device_event_handler;
static SDL_WasapiDeviceEventHandler *capture_device_event_handler;
int WASAPI_PlatformInit(void)
{
SDL_AtomicSet(&SDL_IMMDevice_DefaultPlaybackGeneration, 1);
SDL_AtomicSet(&SDL_IMMDevice_DefaultCaptureGeneration, 1);
return 0;
}
void WASAPI_PlatformDeinit(void)
{
DevIdList *devidlist;
DevIdList *next;
delete playback_device_event_handler;
playback_device_event_handler = nullptr;
delete capture_device_event_handler;
capture_device_event_handler = nullptr;
for (devidlist = deviceid_list; devidlist; devidlist = next) {
next = devidlist->next;
SDL_free(devidlist->str);
SDL_free(devidlist);
}
deviceid_list = NULL;
}
void WASAPI_EnumerateEndpoints(void)
{
// DeviceWatchers will fire an Added event for each existing device at
// startup, so we don't need to enumerate them separately before
// listening for updates.
playback_device_event_handler = new SDL_WasapiDeviceEventHandler(SDL_FALSE);
capture_device_event_handler = new SDL_WasapiDeviceEventHandler(SDL_TRUE);
SDL_SemWait(playback_device_event_handler->completed);
SDL_SemWait(capture_device_event_handler->completed);
}
struct SDL_WasapiActivationHandler : public RuntimeClass<RuntimeClassFlags<ClassicCom>, FtmBase, IActivateAudioInterfaceCompletionHandler>
{
SDL_WasapiActivationHandler() : device(nullptr) {}
STDMETHOD(ActivateCompleted)
(IActivateAudioInterfaceAsyncOperation *operation);
SDL_AudioDevice *device;
};
HRESULT
SDL_WasapiActivationHandler::ActivateCompleted(IActivateAudioInterfaceAsyncOperation *async)
{
// Just set a flag, since we're probably in a different thread. We'll pick it up and init everything on our own thread to prevent races.
SDL_AtomicSet(&device->hidden->just_activated, 1);
WASAPI_UnrefDevice(device);
return S_OK;
}
void WASAPI_PlatformDeleteActivationHandler(void *handler)
{
((SDL_WasapiActivationHandler *)handler)->Release();
}
int WASAPI_GetDefaultAudioInfo(char **name, SDL_AudioSpec *spec, int iscapture)
{
return SDL_Unsupported();
}
int WASAPI_ActivateDevice(_THIS, const SDL_bool isrecovery)
{
LPCWSTR devid = _this->hidden->devid;
Platform::String ^ defdevid;
if (devid == nullptr) {
defdevid = _this->iscapture ? MediaDevice::GetDefaultAudioCaptureId(AudioDeviceRole::Default) : MediaDevice::GetDefaultAudioRenderId(AudioDeviceRole::Default);
if (defdevid) {
devid = defdevid->Data();
}
}
SDL_AtomicSet(&_this->hidden->just_activated, 0);
ComPtr<SDL_WasapiActivationHandler> handler = Make<SDL_WasapiActivationHandler>();
if (handler == nullptr) {
return SDL_SetError("Failed to allocate WASAPI activation handler");
}
handler.Get()->AddRef(); // we hold a reference after ComPtr destructs on return, causing a Release, and Release ourselves in WASAPI_PlatformDeleteActivationHandler(), etc.
handler.Get()->device = _this;
_this->hidden->activation_handler = handler.Get();
WASAPI_RefDevice(_this); /* completion handler will unref it. */
IActivateAudioInterfaceAsyncOperation *async = nullptr;
const HRESULT ret = ActivateAudioInterfaceAsync(devid, __uuidof(IAudioClient), nullptr, handler.Get(), &async);
if (FAILED(ret) || async == nullptr) {
if (async != nullptr) {
async->Release();
}
handler.Get()->Release();
WASAPI_UnrefDevice(_this);
return WIN_SetErrorFromHRESULT("WASAPI can't activate requested audio endpoint", ret);
}
/* Spin until the async operation is complete.
* If we don't PrepDevice before leaving this function, the bug list gets LONG:
* - device.spec is not filled with the correct information
* - The 'obtained' spec will be wrong for ALLOW_CHANGE properties
* - SDL_AudioStreams will/will not be allocated at the right time
* - SDL_assert(device->callbackspec.size == device->spec.size) will fail
* - When the assert is ignored, skipping or a buffer overflow will occur
*/
while (!SDL_AtomicCAS(&_this->hidden->just_activated, 1, 0)) {
SDL_Delay(1);
}
HRESULT activateRes = S_OK;
IUnknown *iunknown = nullptr;
const HRESULT getActivateRes = async->GetActivateResult(&activateRes, &iunknown);
async->Release();
if (FAILED(getActivateRes)) {
return WIN_SetErrorFromHRESULT("Failed to get WASAPI activate result", getActivateRes);
} else if (FAILED(activateRes)) {
return WIN_SetErrorFromHRESULT("Failed to activate WASAPI device", activateRes);
}
iunknown->QueryInterface(IID_PPV_ARGS(&_this->hidden->client));
if (!_this->hidden->client) {
return SDL_SetError("Failed to query WASAPI client interface");
}
if (WASAPI_PrepDevice(_this, isrecovery) == -1) {
return -1;
}
return 0;
}
void WASAPI_PlatformThreadInit(_THIS)
{
// !!! FIXME: set this thread to "Pro Audio" priority.
}
void WASAPI_PlatformThreadDeinit(_THIS)
{
// !!! FIXME: set this thread to "Pro Audio" priority.
}
/* Everything below was copied from SDL_wasapi.c, before it got moved to SDL_immdevice.c! */
static const GUID SDL_KSDATAFORMAT_SUBTYPE_PCM = { 0x00000001, 0x0000, 0x0010, { 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 } };
static const GUID SDL_KSDATAFORMAT_SUBTYPE_IEEE_FLOAT = { 0x00000003, 0x0000, 0x0010, { 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 } };
extern "C" SDL_AudioFormat
WaveFormatToSDLFormat(WAVEFORMATEX *waveformat)
{
if ((waveformat->wFormatTag == WAVE_FORMAT_IEEE_FLOAT) && (waveformat->wBitsPerSample == 32)) {
return AUDIO_F32SYS;
} else if ((waveformat->wFormatTag == WAVE_FORMAT_PCM) && (waveformat->wBitsPerSample == 16)) {
return AUDIO_S16SYS;
} else if ((waveformat->wFormatTag == WAVE_FORMAT_PCM) && (waveformat->wBitsPerSample == 32)) {
return AUDIO_S32SYS;
} else if (waveformat->wFormatTag == WAVE_FORMAT_EXTENSIBLE) {
const WAVEFORMATEXTENSIBLE *ext = (const WAVEFORMATEXTENSIBLE *)waveformat;
if ((SDL_memcmp(&ext->SubFormat, &SDL_KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, sizeof(GUID)) == 0) && (waveformat->wBitsPerSample == 32)) {
return AUDIO_F32SYS;
} else if ((SDL_memcmp(&ext->SubFormat, &SDL_KSDATAFORMAT_SUBTYPE_PCM, sizeof(GUID)) == 0) && (waveformat->wBitsPerSample == 16)) {
return AUDIO_S16SYS;
} else if ((SDL_memcmp(&ext->SubFormat, &SDL_KSDATAFORMAT_SUBTYPE_PCM, sizeof(GUID)) == 0) && (waveformat->wBitsPerSample == 32)) {
return AUDIO_S32SYS;
}
}
return 0;
}
static void WASAPI_RemoveDevice(const SDL_bool iscapture, LPCWSTR devid)
{
DevIdList *i;
DevIdList *next;
DevIdList *prev = NULL;
for (i = deviceid_list; i; i = next) {
next = i->next;
if (SDL_wcscmp(i->str, devid) == 0) {
if (prev) {
prev->next = next;
} else {
deviceid_list = next;
}
SDL_RemoveAudioDevice(iscapture, i->str);
SDL_free(i->str);
SDL_free(i);
} else {
prev = i;
}
}
}
static void WASAPI_AddDevice(const SDL_bool iscapture, const char *devname, WAVEFORMATEXTENSIBLE *fmt, LPCWSTR devid)
{
DevIdList *devidlist;
SDL_AudioSpec spec;
/* You can have multiple endpoints on a device that are mutually exclusive ("Speakers" vs "Line Out" or whatever).
In a perfect world, things that are unplugged won't be in this collection. The only gotcha is probably for
phones and tablets, where you might have an internal speaker and a headphone jack and expect both to be
available and switch automatically. (!!! FIXME...?) */
/* see if we already have this one. */
for (devidlist = deviceid_list; devidlist; devidlist = devidlist->next) {
if (SDL_wcscmp(devidlist->str, devid) == 0) {
return; /* we already have this. */
}
}
devidlist = (DevIdList *)SDL_malloc(sizeof(*devidlist));
if (devidlist == NULL) {
return; /* oh well. */
}
devid = SDL_wcsdup(devid);
if (!devid) {
SDL_free(devidlist);
return; /* oh well. */
}
devidlist->str = (WCHAR *)devid;
devidlist->next = deviceid_list;
deviceid_list = devidlist;
SDL_zero(spec);
spec.channels = (Uint8)fmt->Format.nChannels;
spec.freq = fmt->Format.nSamplesPerSec;
spec.format = WaveFormatToSDLFormat((WAVEFORMATEX *)fmt);
SDL_AddAudioDevice(iscapture, devname, &spec, (void *)devid);
}
#endif // SDL_AUDIO_DRIVER_WASAPI && defined(__WINRT__)
/* vi: set ts=4 sw=4 expandtab: */