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pineappleEA
2021-04-18 05:35:25 +02:00
parent 16f54e367d
commit 18db69f039
1409 changed files with 545335 additions and 10 deletions
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769
externals/SDL/src/audio/wasapi/SDL_wasapi.c vendored Executable file
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2020 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 "SDL_audio.h"
#include "SDL_timer.h"
#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
#include "SDL_assert.h"
#include "SDL_log.h"
#define COBJMACROS
#include <mmdeviceapi.h>
#include <audioclient.h>
#include "SDL_wasapi.h"
/* This constant isn't available on MinGW-w64 */
#ifndef AUDCLNT_STREAMFLAGS_RATEADJUST
#define AUDCLNT_STREAMFLAGS_RATEADJUST 0x00100000
#endif
/* these increment as default devices change. Opened default devices pick up changes in their threads. */
SDL_atomic_t WASAPI_DefaultPlaybackGeneration;
SDL_atomic_t WASAPI_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;
/* 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 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 } };
static SDL_bool
WStrEqual(const WCHAR *a, const WCHAR *b)
{
while (*a) {
if (*a != *b) {
return SDL_FALSE;
}
a++;
b++;
}
return *b == 0;
}
static size_t
WStrLen(const WCHAR *wstr)
{
size_t retval = 0;
if (wstr) {
while (*(wstr++)) {
retval++;
}
}
return retval;
}
static WCHAR *
WStrDupe(const WCHAR *wstr)
{
const size_t len = (WStrLen(wstr) + 1) * sizeof (WCHAR);
WCHAR *retval = (WCHAR *) SDL_malloc(len);
if (retval) {
SDL_memcpy(retval, wstr, len);
}
return retval;
}
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 (WStrEqual(i->str, devid)) {
if (prev) {
prev->next = next;
} else {
deviceid_list = next;
}
SDL_RemoveAudioDevice(iscapture, i->str);
SDL_free(i->str);
SDL_free(i);
}
prev = i;
}
}
void
WASAPI_AddDevice(const SDL_bool iscapture, const char *devname, LPCWSTR devid)
{
DevIdList *devidlist;
/* 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 (WStrEqual(devidlist->str, devid)) {
return; /* we already have this. */
}
}
devidlist = (DevIdList *) SDL_malloc(sizeof (*devidlist));
if (!devidlist) {
return; /* oh well. */
}
devid = WStrDupe(devid);
if (!devid) {
SDL_free(devidlist);
return; /* oh well. */
}
devidlist->str = (WCHAR *) devid;
devidlist->next = deviceid_list;
deviceid_list = devidlist;
SDL_AddAudioDevice(iscapture, devname, (void *) devid);
}
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;
}
}
/* 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 ? &WASAPI_DefaultCaptureGeneration : &WASAPI_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 ? &WASAPI_DefaultCaptureGeneration : &WASAPI_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 (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_SetEventHandle(this->hidden->client, NULL);
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);
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 duration = 0;
IAudioClient *client = this->hidden->client;
IAudioRenderClient *render = NULL;
IAudioCaptureClient *capture = NULL;
WAVEFORMATEX *waveformat = NULL;
SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
SDL_AudioFormat wasapi_format = 0;
SDL_bool valid_format = SDL_FALSE;
HRESULT ret = S_OK;
DWORD streamflags = 0;
SDL_assert(client != NULL);
#ifdef __WINRT__ /* 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. */
if ((waveformat->wFormatTag == WAVE_FORMAT_IEEE_FLOAT) && (waveformat->wBitsPerSample == 32)) {
wasapi_format = AUDIO_F32SYS;
} else if ((waveformat->wFormatTag == WAVE_FORMAT_PCM) && (waveformat->wBitsPerSample == 16)) {
wasapi_format = AUDIO_S16SYS;
} else if ((waveformat->wFormatTag == WAVE_FORMAT_PCM) && (waveformat->wBitsPerSample == 32)) {
wasapi_format = 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)) {
wasapi_format = AUDIO_F32SYS;
} else if ((SDL_memcmp(&ext->SubFormat, &SDL_KSDATAFORMAT_SUBTYPE_PCM, sizeof (GUID)) == 0) && (waveformat->wBitsPerSample == 16)) {
wasapi_format = AUDIO_S16SYS;
} else if ((SDL_memcmp(&ext->SubFormat, &SDL_KSDATAFORMAT_SUBTYPE_PCM, sizeof (GUID)) == 0) && (waveformat->wBitsPerSample == 32)) {
wasapi_format = AUDIO_S32SYS;
}
}
while ((!valid_format) && (test_format)) {
if (test_format == wasapi_format) {
this->spec.format = test_format;
valid_format = SDL_TRUE;
break;
}
test_format = SDL_NextAudioFormat();
}
if (!valid_format) {
return SDL_SetError("WASAPI: Unsupported audio format");
}
ret = IAudioClient_GetDevicePeriod(client, NULL, &duration);
if (FAILED(ret)) {
return WIN_SetErrorFromHRESULT("WASAPI can't determine minimum device period", ret);
}
/* favor WASAPI's resampler over our own, in Win7+. */
if (this->spec.freq != waveformat->nSamplesPerSec) {
/* RATEADJUST only works with output devices in share mode, and is available in Win7 and later.*/
if (WIN_IsWindows7OrGreater() && !this->iscapture && (sharemode == AUDCLNT_SHAREMODE_SHARED)) {
streamflags |= AUDCLNT_STREAMFLAGS_RATEADJUST;
waveformat->nSamplesPerSec = this->spec.freq;
waveformat->nAvgBytesPerSec = waveformat->nSamplesPerSec * waveformat->nChannels * (waveformat->wBitsPerSample / 8);
}
else {
this->spec.freq = waveformat->nSamplesPerSec; /* force sampling rate so our resampler kicks in. */
}
}
streamflags |= AUDCLNT_STREAMFLAGS_EVENTCALLBACK;
ret = IAudioClient_Initialize(client, sharemode, streamflags, duration, sharemode == AUDCLNT_SHAREMODE_SHARED ? 0 : duration, 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);
}
this->spec.samples = (Uint16) bufsize;
if (!this->iscapture) {
this->spec.samples /= 2; /* fill half of the DMA buffer on each run. */
}
/* 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) {
if (UpdateAudioStream(this, &oldspec) == -1) {
return -1;
}
}
return 0; /* good to go. */
}
static int
WASAPI_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
LPCWSTR devid = (LPCWSTR) 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 (!devid) { /* is default device? */
this->hidden->default_device_generation = SDL_AtomicGet(iscapture ? &WASAPI_DefaultCaptureGeneration : &WASAPI_DefaultPlaybackGeneration);
} else {
this->hidden->devid = WStrDupe(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);
}
void
WASAPI_BeginLoopIteration(_THIS)
{
/* no-op. */
}
static void
WASAPI_Deinitialize(void)
{
DevIdList *devidlist;
DevIdList *next;
WASAPI_PlatformDeinit();
for (devidlist = deviceid_list; devidlist; devidlist = next) {
next = devidlist->next;
SDL_free(devidlist->str);
SDL_free(devidlist);
}
deviceid_list = NULL;
}
static int
WASAPI_Init(SDL_AudioDriverImpl * impl)
{
SDL_AtomicSet(&WASAPI_DefaultPlaybackGeneration, 1);
SDL_AtomicSet(&WASAPI_DefaultCaptureGeneration, 1);
if (WASAPI_PlatformInit() == -1) {
return 0;
}
/* Set the function pointers */
impl->DetectDevices = WASAPI_DetectDevices;
impl->ThreadInit = WASAPI_ThreadInit;
impl->ThreadDeinit = WASAPI_ThreadDeinit;
impl->BeginLoopIteration = WASAPI_BeginLoopIteration;
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->HasCaptureSupport = 1;
return 1; /* this audio target is available. */
}
AudioBootStrap WASAPI_bootstrap = {
"wasapi", "WASAPI", WASAPI_Init, 0
};
#endif /* SDL_AUDIO_DRIVER_WASAPI */
/* vi: set ts=4 sw=4 expandtab: */

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externals/SDL/src/audio/wasapi/SDL_wasapi.h vendored Executable file
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2020 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_bool coinitialized;
int framesize;
int default_device_generation;
SDL_bool device_lost;
void *activation_handler;
SDL_atomic_t just_activated;
};
/* these increment as default devices change. Opened default devices pick up changes in their threads. */
extern SDL_atomic_t WASAPI_DefaultPlaybackGeneration;
extern SDL_atomic_t WASAPI_DefaultCaptureGeneration;
/* win32 and winrt implementations call into these. */
int WASAPI_PrepDevice(_THIS, const SDL_bool updatestream);
void WASAPI_RefDevice(_THIS);
void WASAPI_UnrefDevice(_THIS);
void WASAPI_AddDevice(const SDL_bool iscapture, const char *devname, LPCWSTR devid);
void WASAPI_RemoveDevice(const SDL_bool iscapture, LPCWSTR devid);
/* 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_ActivateDevice(_THIS, const SDL_bool isrecovery);
void WASAPI_PlatformThreadInit(_THIS);
void WASAPI_PlatformThreadDeinit(_THIS);
void WASAPI_PlatformDeleteActivationHandler(void *handler);
void WASAPI_BeginLoopIteration(_THIS);
#ifdef __cplusplus
}
#endif
#endif /* SDL_wasapi_h_ */
/* vi: set ts=4 sw=4 expandtab: */

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externals/SDL/src/audio/wasapi/SDL_wasapi_win32.c vendored Executable file
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2020 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 "SDL_audio.h"
#include "SDL_timer.h"
#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
#include "SDL_assert.h"
#include "SDL_log.h"
#define COBJMACROS
#include <mmdeviceapi.h>
#include <audioclient.h>
#include "SDL_wasapi.h"
static const ERole SDL_WASAPI_role = eConsole; /* !!! FIXME: should this be eMultimedia? Should be a hint? */
/* This is global to the WASAPI target, to handle hotplug and default device lookup. */
static IMMDeviceEnumerator *enumerator = NULL;
/* PropVariantInit() is an inline function/macro in PropIdl.h that calls the C runtime's memset() directly. Use ours instead, to avoid dependency. */
#ifdef PropVariantInit
#undef PropVariantInit
#endif
#define PropVariantInit(p) SDL_zerop(p)
/* 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)(LPWSTR, 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 CLSID SDL_CLSID_MMDeviceEnumerator = { 0xbcde0395, 0xe52f, 0x467c,{ 0x8e, 0x3d, 0xc4, 0x57, 0x92, 0x91, 0x69, 0x2e } };
static const IID SDL_IID_IMMDeviceEnumerator = { 0xa95664d2, 0x9614, 0x4f35,{ 0xa7, 0x46, 0xde, 0x8d, 0xb6, 0x36, 0x17, 0xe6 } };
static const IID SDL_IID_IMMNotificationClient = { 0x7991eec9, 0x7e89, 0x4d85,{ 0x83, 0x90, 0x6c, 0x70, 0x3c, 0xec, 0x60, 0xc0 } };
static const IID SDL_IID_IMMEndpoint = { 0x1be09788, 0x6894, 0x4089,{ 0x85, 0x86, 0x9a, 0x2a, 0x6c, 0x26, 0x5a, 0xc5 } };
static const IID SDL_IID_IAudioClient = { 0x1cb9ad4c, 0xdbfa, 0x4c32,{ 0xb1, 0x78, 0xc2, 0xf5, 0x68, 0xa7, 0x03, 0xb2 } };
static const PROPERTYKEY SDL_PKEY_Device_FriendlyName = { { 0xa45c254e, 0xdf1c, 0x4efd,{ 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0, } }, 14 };
static char *
GetWasapiDeviceName(IMMDevice *device)
{
/* PKEY_Device_FriendlyName gives you "Speakers (SoundBlaster Pro)" which drives me nuts. I'd rather it be
"SoundBlaster Pro (Speakers)" but I guess that's developers vs users. Windows uses the FriendlyName in
its own UIs, like Volume Control, etc. */
char *utf8dev = NULL;
IPropertyStore *props = NULL;
if (SUCCEEDED(IMMDevice_OpenPropertyStore(device, STGM_READ, &props))) {
PROPVARIANT var;
PropVariantInit(&var);
if (SUCCEEDED(IPropertyStore_GetValue(props, &SDL_PKEY_Device_FriendlyName, &var))) {
utf8dev = WIN_StringToUTF8(var.pwszVal);
}
PropVariantClear(&var);
IPropertyStore_Release(props);
}
return utf8dev;
}
/* We need a COM subclass of IMMNotificationClient for hotplug support, which is
easy in C++, but we have to tapdance more to make work in C.
Thanks to this page for coaching on how to make this work:
https://www.codeproject.com/Articles/13601/COM-in-plain-C */
typedef struct SDLMMNotificationClient
{
const IMMNotificationClientVtbl *lpVtbl;
SDL_atomic_t refcount;
} SDLMMNotificationClient;
static HRESULT STDMETHODCALLTYPE
SDLMMNotificationClient_QueryInterface(IMMNotificationClient *this, REFIID iid, void **ppv)
{
if ((WIN_IsEqualIID(iid, &IID_IUnknown)) || (WIN_IsEqualIID(iid, &SDL_IID_IMMNotificationClient)))
{
*ppv = this;
this->lpVtbl->AddRef(this);
return S_OK;
}
*ppv = NULL;
return E_NOINTERFACE;
}
static ULONG STDMETHODCALLTYPE
SDLMMNotificationClient_AddRef(IMMNotificationClient *ithis)
{
SDLMMNotificationClient *this = (SDLMMNotificationClient *) ithis;
return (ULONG) (SDL_AtomicIncRef(&this->refcount) + 1);
}
static ULONG STDMETHODCALLTYPE
SDLMMNotificationClient_Release(IMMNotificationClient *ithis)
{
/* this is a static object; we don't ever free it. */
SDLMMNotificationClient *this = (SDLMMNotificationClient *) ithis;
const ULONG retval = SDL_AtomicDecRef(&this->refcount);
if (retval == 0) {
SDL_AtomicSet(&this->refcount, 0); /* uhh... */
return 0;
}
return retval - 1;
}
/* These are the entry points called when WASAPI device endpoints change. */
static HRESULT STDMETHODCALLTYPE
SDLMMNotificationClient_OnDefaultDeviceChanged(IMMNotificationClient *ithis, EDataFlow flow, ERole role, LPCWSTR pwstrDeviceId)
{
if (role != SDL_WASAPI_role) {
return S_OK; /* ignore it. */
}
/* Increment the "generation," so opened devices will pick this up in their threads. */
switch (flow) {
case eRender:
SDL_AtomicAdd(&WASAPI_DefaultPlaybackGeneration, 1);
break;
case eCapture:
SDL_AtomicAdd(&WASAPI_DefaultCaptureGeneration, 1);
break;
case eAll:
SDL_AtomicAdd(&WASAPI_DefaultPlaybackGeneration, 1);
SDL_AtomicAdd(&WASAPI_DefaultCaptureGeneration, 1);
break;
default:
SDL_assert(!"uhoh, unexpected OnDefaultDeviceChange flow!");
break;
}
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
SDLMMNotificationClient_OnDeviceAdded(IMMNotificationClient *ithis, LPCWSTR pwstrDeviceId)
{
/* we ignore this; devices added here then progress to ACTIVE, if appropriate, in
OnDeviceStateChange, making that a better place to deal with device adds. More
importantly: the first time you plug in a USB audio device, this callback will
fire, but when you unplug it, it isn't removed (it's state changes to NOTPRESENT).
Plugging it back in won't fire this callback again. */
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
SDLMMNotificationClient_OnDeviceRemoved(IMMNotificationClient *ithis, LPCWSTR pwstrDeviceId)
{
/* See notes in OnDeviceAdded handler about why we ignore this. */
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
SDLMMNotificationClient_OnDeviceStateChanged(IMMNotificationClient *ithis, LPCWSTR pwstrDeviceId, DWORD dwNewState)
{
IMMDevice *device = NULL;
if (SUCCEEDED(IMMDeviceEnumerator_GetDevice(enumerator, pwstrDeviceId, &device))) {
IMMEndpoint *endpoint = NULL;
if (SUCCEEDED(IMMDevice_QueryInterface(device, &SDL_IID_IMMEndpoint, (void **) &endpoint))) {
EDataFlow flow;
if (SUCCEEDED(IMMEndpoint_GetDataFlow(endpoint, &flow))) {
const SDL_bool iscapture = (flow == eCapture);
if (dwNewState == DEVICE_STATE_ACTIVE) {
char *utf8dev = GetWasapiDeviceName(device);
if (utf8dev) {
WASAPI_AddDevice(iscapture, utf8dev, pwstrDeviceId);
SDL_free(utf8dev);
}
} else {
WASAPI_RemoveDevice(iscapture, pwstrDeviceId);
}
}
IMMEndpoint_Release(endpoint);
}
IMMDevice_Release(device);
}
return S_OK;
}
static HRESULT STDMETHODCALLTYPE
SDLMMNotificationClient_OnPropertyValueChanged(IMMNotificationClient *this, LPCWSTR pwstrDeviceId, const PROPERTYKEY key)
{
return S_OK; /* we don't care about these. */
}
static const IMMNotificationClientVtbl notification_client_vtbl = {
SDLMMNotificationClient_QueryInterface,
SDLMMNotificationClient_AddRef,
SDLMMNotificationClient_Release,
SDLMMNotificationClient_OnDeviceStateChanged,
SDLMMNotificationClient_OnDeviceAdded,
SDLMMNotificationClient_OnDeviceRemoved,
SDLMMNotificationClient_OnDefaultDeviceChanged,
SDLMMNotificationClient_OnPropertyValueChanged
};
static SDLMMNotificationClient notification_client = { &notification_client_vtbl, { 1 } };
int
WASAPI_PlatformInit(void)
{
HRESULT ret;
/* just skip the discussion with COM here. */
if (!WIN_IsWindowsVistaOrGreater()) {
return SDL_SetError("WASAPI support requires Windows Vista or later");
}
if (FAILED(WIN_CoInitialize())) {
return SDL_SetError("WASAPI: CoInitialize() failed");
}
ret = CoCreateInstance(&SDL_CLSID_MMDeviceEnumerator, NULL, CLSCTX_INPROC_SERVER, &SDL_IID_IMMDeviceEnumerator, (LPVOID) &enumerator);
if (FAILED(ret)) {
WIN_CoUninitialize();
return WIN_SetErrorFromHRESULT("WASAPI CoCreateInstance(MMDeviceEnumerator)", ret);
}
libavrt = LoadLibraryW(L"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 (enumerator) {
IMMDeviceEnumerator_UnregisterEndpointNotificationCallback(enumerator, (IMMNotificationClient *) &notification_client);
IMMDeviceEnumerator_Release(enumerator);
enumerator = NULL;
}
if (libavrt) {
FreeLibrary(libavrt);
libavrt = NULL;
}
pAvSetMmThreadCharacteristicsW = NULL;
pAvRevertMmThreadCharacteristics = NULL;
WIN_CoUninitialize();
}
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(TEXT("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)
{
LPCWSTR devid = this->hidden->devid;
IMMDevice *device = NULL;
HRESULT ret;
if (devid == NULL) {
const EDataFlow dataflow = this->iscapture ? eCapture : eRender;
ret = IMMDeviceEnumerator_GetDefaultAudioEndpoint(enumerator, dataflow, SDL_WASAPI_role, &device);
} else {
ret = IMMDeviceEnumerator_GetDevice(enumerator, devid, &device);
}
if (FAILED(ret)) {
SDL_assert(device == NULL);
this->hidden->client = NULL;
return WIN_SetErrorFromHRESULT("WASAPI can't find requested audio endpoint", ret);
}
/* 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. */
}
typedef struct
{
LPWSTR devid;
char *devname;
} EndpointItem;
static int sort_endpoints(const void *_a, const void *_b)
{
LPWSTR a = ((const EndpointItem *) _a)->devid;
LPWSTR b = ((const EndpointItem *) _b)->devid;
if (!a && b) {
return -1;
} else if (a && !b) {
return 1;
}
while (SDL_TRUE) {
if (*a < *b) {
return -1;
} else if (*a > *b) {
return 1;
} else if (*a == 0) {
break;
}
a++;
b++;
}
return 0;
}
static void
WASAPI_EnumerateEndpointsForFlow(const SDL_bool iscapture)
{
IMMDeviceCollection *collection = NULL;
EndpointItem *items;
UINT i, total;
/* Note that WASAPI separates "adapter devices" from "audio endpoint devices"
...one adapter device ("SoundBlaster Pro") might have multiple endpoint devices ("Speakers", "Line-Out"). */
if (FAILED(IMMDeviceEnumerator_EnumAudioEndpoints(enumerator, iscapture ? eCapture : eRender, DEVICE_STATE_ACTIVE, &collection))) {
return;
}
if (FAILED(IMMDeviceCollection_GetCount(collection, &total))) {
IMMDeviceCollection_Release(collection);
return;
}
items = (EndpointItem *) SDL_calloc(total, sizeof (EndpointItem));
if (!items) {
return; /* oh well. */
}
for (i = 0; i < total; i++) {
EndpointItem *item = items + i;
IMMDevice *device = NULL;
if (SUCCEEDED(IMMDeviceCollection_Item(collection, i, &device))) {
if (SUCCEEDED(IMMDevice_GetId(device, &item->devid))) {
item->devname = GetWasapiDeviceName(device);
}
IMMDevice_Release(device);
}
}
/* sort the list of devices by their guid so list is consistent between runs */
SDL_qsort(items, total, sizeof (*items), sort_endpoints);
/* Send the sorted list on to the SDL's higher level. */
for (i = 0; i < total; i++) {
EndpointItem *item = items + i;
if ((item->devid) && (item->devname)) {
WASAPI_AddDevice(iscapture, item->devname, item->devid);
}
SDL_free(item->devname);
CoTaskMemFree(item->devid);
}
SDL_free(items);
IMMDeviceCollection_Release(collection);
}
void
WASAPI_EnumerateEndpoints(void)
{
WASAPI_EnumerateEndpointsForFlow(SDL_FALSE); /* playback */
WASAPI_EnumerateEndpointsForFlow(SDL_TRUE); /* capture */
/* if this fails, we just won't get hotplug events. Carry on anyhow. */
IMMDeviceEnumerator_RegisterEndpointNotificationCallback(enumerator, (IMMNotificationClient *) &notification_client);
}
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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/*
Simple DirectMedia Layer
Copyright (C) 1997-2020 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>
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"
#include "SDL_assert.h"
#include "SDL_log.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;
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))
, watcher(DeviceInformation::CreateWatcher(_iscapture ? DeviceClass::AudioCapture : DeviceClass::AudioRender))
{
if (!watcher || !completed)
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) {
WASAPI_AddDevice(this->iscapture, utf8dev, 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(&WASAPI_DefaultPlaybackGeneration, 1);
}
void
SDL_WasapiDeviceEventHandler::OnDefaultCaptureDeviceChanged(Platform::Object^ sender, DefaultAudioCaptureDeviceChangedEventArgs^ args)
{
SDL_assert(!this->iscapture);
SDL_AtomicAdd(&WASAPI_DefaultCaptureGeneration, 1);
}
static SDL_WasapiDeviceEventHandler *playback_device_event_handler;
static SDL_WasapiDeviceEventHandler *capture_device_event_handler;
int WASAPI_PlatformInit(void)
{
return 0;
}
void WASAPI_PlatformDeinit(void)
{
delete playback_device_event_handler;
playback_device_event_handler = nullptr;
delete capture_device_event_handler;
capture_device_event_handler = nullptr;
}
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_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.
}
#endif // SDL_AUDIO_DRIVER_WASAPI && defined(__WINRT__)
/* vi: set ts=4 sw=4 expandtab: */