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Wii U: Support For Seperate Gamepad and TV Audio Devices #116

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290d17f
Support for multiple seperate audio devices for the gamepad and tv
Fangal-Airbag Sep 23, 2025
874da16
Seperate AX initialization from opening and closing devices, and remo…
Fangal-Airbag Sep 27, 2025
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3 changes: 3 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,9 @@ cmake-build-*
xcuserdata
*.xcworkspace

# for VSCode
.vscode

# for QtCreator
CMakeLists.txt.user
build*/
Expand Down
5 changes: 5 additions & 0 deletions include/SDL_audio.h
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Original file line number Diff line number Diff line change
Expand Up @@ -148,6 +148,11 @@ typedef Uint16 SDL_AudioFormat;

/* @} *//* Audio flags */

/* Wii U Audio Devices */
#define SDL_AUDIO_DEVICE_WIIU_MIRRORED "Wii U Mirrored"
#define SDL_AUDIO_DEVICE_WIIU_TV "Wii U TV"
#define SDL_AUDIO_DEVICE_WIIU_GAMEPAD "Wii U Gamepad"

/**
* This function is called when the audio device needs more data.
*
Expand Down
229 changes: 153 additions & 76 deletions src/audio/wiiu/SDL_wiiuaudio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
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_WIIU
Expand Down Expand Up @@ -47,9 +48,15 @@

#define AX_MAIN_AFFINITY OS_THREAD_ATTRIB_AFFINITY_CPU1

#define WIIU_DEVICE_TV 0
#define WIIU_DEVICE_GAMEPAD 1
#define WIIU_DEVICE_MIRRORED 2
#define WIIU_MAX_DEVICES 3

static void _WIIUAUDIO_framecallback();
static SDL_AudioDevice* cb_this;
#define cb_hidden cb_this->hidden
static SDL_AudioDevice *wiiuDevices[WIIU_MAX_DEVICES];
static int deviceType;
static int deviceCount;

/* Some helpers for AX-related math */
/* Absolute address to an AXVoiceOffsets offset */
Expand Down Expand Up @@ -78,7 +85,7 @@ static int _WIIUAUDIO_OpenDeviceFunction(_THIS) {

SDL_zerop(this->hidden);

/* Take a quick aside to init the wiiu audio */
/* Take a quick aside to init the wiiu audio */
if (!AXIsInit()) {
/* Init the AX audio engine */
AXInitParams initparams = {
Expand Down Expand Up @@ -177,16 +184,36 @@ static int _WIIUAUDIO_OpenDeviceFunction(_THIS) {
AXSetVoiceVe(this->hidden->voice[i], &vol);
switch (this->spec.channels) {
case 1: /* mono */ {
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_DRC, 0, mono_mix[i]);
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_TV, 0, mono_mix[i]);
if (deviceType == WIIU_DEVICE_MIRRORED) {
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_DRC, 0, mono_mix[i]);
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_TV, 0, mono_mix[i]);
}
else if (deviceType == WIIU_DEVICE_TV) {
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_TV, 0, mono_mix[i]);
}
else if (deviceType == WIIU_DEVICE_GAMEPAD) {
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_DRC, 0, mono_mix[i]);
}
} break;
case 2: /* stereo */ {
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_DRC, 0, stereo_mix[i]);
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_TV, 0, stereo_mix[i]);
if (deviceType == WIIU_DEVICE_MIRRORED) {
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_DRC, 0, stereo_mix[i]);
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_TV, 0, stereo_mix[i]);
}
else if (deviceType == WIIU_DEVICE_TV) {
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_TV, 0, stereo_mix[i]);
}
else if (deviceType == WIIU_DEVICE_GAMEPAD) {
AXSetVoiceDeviceMix(this->hidden->voice[i],
AX_DEVICE_TYPE_DRC, 0, stereo_mix[i]);
}
} break;
}

Expand Down Expand Up @@ -235,8 +262,13 @@ static int _WIIUAUDIO_OpenDeviceFunction(_THIS) {
AXVoiceEnd(this->hidden->voice[i]);
}

cb_this = this; //wish there was a better way
AXRegisterAppFrameCallback(_WIIUAUDIO_framecallback);
wiiuDevices[deviceCount] = this;

if (deviceCount < 1) {
AXRegisterAppFrameCallback(_WIIUAUDIO_framecallback);
}

deviceCount++;

return 0;
}
Expand All @@ -249,9 +281,43 @@ static void _WIIUAUDIO_ThreadDeallocator(OSThread *thread, void *stack) {
static void _WIIUAUDIO_ThreadCleanup(OSThread *thread, void *stack) {
}

static void WIIUAUDIO_DetectDevices(void) {
void *drcHandle;
void *tvHandle;
void *mirrorHandle;

/* This gets reset later anyways */
SDL_AudioSpec spec;

spec.channels = WIIU_MAX_VALID_CHANNELS;
spec.format = AUDIO_S16MSB;
spec.samples = 4096;

SDL_CalculateAudioSpec(&spec);

SDL_AddAudioDevice(SDL_FALSE, SDL_AUDIO_DEVICE_WIIU_MIRRORED, &spec, &mirrorHandle);
SDL_AddAudioDevice(SDL_FALSE, SDL_AUDIO_DEVICE_WIIU_TV, &spec, &tvHandle);
SDL_AddAudioDevice(SDL_FALSE, SDL_AUDIO_DEVICE_WIIU_GAMEPAD, &spec, &drcHandle);
Comment on lines +298 to +300
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@GaryOderNichts GaryOderNichts Nov 26, 2025 •
edited
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The "handles" here are supposed to be unique identifiers/pointers which can be retried using device->handle. In this case you could do something similar to the SNDIO driver, and use your device IDs here:

SDL/src/audio/sndio/SDL_sndioaudio.c

Lines 324 to 328 in 8289656

static void SNDIO_DetectDevices(SDL_AudioDevice **default_playback, SDL_AudioDevice **default_recording)
{
*default_playback = SDL_AddAudioDevice(false, DEFAULT_PLAYBACK_DEVNAME, NULL, (void *)0x1);
*default_recording = SDL_AddAudioDevice(true, DEFAULT_RECORDING_DEVNAME, NULL, (void *)0x2);
}

Then you can check this handle in WIIUAUDIO_OpenDevice and avoid comparing against the device name.

}

static int WIIUAUDIO_OpenDevice(_THIS, const char *devname) {
int result;

if (deviceCount >= WIIU_MAX_DEVICES) {
return SDL_SetError("Too many Wii U audio devices! (Max: %d)", WIIU_MAX_DEVICES);
}

deviceType = WIIU_DEVICE_MIRRORED;

if (devname != NULL) {
if (SDL_strcmp(devname, SDL_AUDIO_DEVICE_WIIU_TV) == 0) {
deviceType = WIIU_DEVICE_TV;
}
else if (SDL_strcmp(devname, SDL_AUDIO_DEVICE_WIIU_GAMEPAD) == 0) {
deviceType = WIIU_DEVICE_GAMEPAD;
}
}

/* AX functions need to run from the same core.
Since we cannot easily change the affinity of the currently running thread, we create a new one if necessary.
This thread only runs on CPU1 (AX_MAIN_AFFINITY) and will be joined after initialization is done. */
Expand Down Expand Up @@ -300,78 +366,84 @@ static int WIIUAUDIO_OpenDevice(_THIS, const char *devname) {

/* Called every 3ms before a frame of audio is rendered. Keep it fast! */
static void _WIIUAUDIO_framecallback() {
int playing_buffer = -1;
AXVoiceOffsets offs[6];
void* endaddr;

for (int i = 0; i < cb_this->spec.channels; i++) {
AXGetVoiceOffsets(cb_hidden->voice[i], &offs[i]);
}
for (int deviceIndex = 0; deviceIndex < deviceCount; ++deviceIndex) {
SDL_AudioDevice *dev = wiiuDevices[deviceIndex];

int playing_buffer = -1;
AXVoiceOffsets offs[6];
void* endaddr;

for (int i = 0; i < dev->spec.channels; i++) {
AXGetVoiceOffsets(dev->hidden->voice[i], &offs[i]);
}

/* Figure out which buffer is being played by the hardware */
for (int i = 0; i < NUM_BUFFERS; i++) {
void* buf = cb_hidden->mixbufs[i];
uint32_t startOffset = calc_ax_offset(offs[0], buf);
uint32_t endOffset = startOffset + cb_this->spec.samples;

/* NOTE endOffset definitely needs to be <= (AX plays the sample at
endOffset), dunno about startOffset */
if (offs[0].currentOffset >= startOffset &&
offs[0].currentOffset <= endOffset) {
playing_buffer = i;
break;
/* Figure out which buffer is being played by the hardware */
for (int i = 0; i < NUM_BUFFERS; i++) {
void* buf = dev->hidden->mixbufs[i];
uint32_t startOffset = calc_ax_offset(offs[0], buf);
uint32_t endOffset = startOffset + dev->spec.samples;

/* NOTE endOffset definitely needs to be <= (AX plays the sample at
endOffset), dunno about startOffset */
if (offs[0].currentOffset >= startOffset &&
offs[0].currentOffset <= endOffset) {
playing_buffer = i;
break;
}
}
}

if (playing_buffer < 0 || playing_buffer >= NUM_BUFFERS) {
/* UM */
/* Uncomment for craploads of debug info */
/*printf("bad buffer %d\n" "|> %08X, %08X-%08X\n" \
"0: xxxxxxxx, %08X-%08X (%08X@%08X)\n" \
"1: xxxxxxxx, %08X-%08X (%08X@%08X)\n", \
playing_buffer, offs.currentOffset, offs.loopOffset, offs.endOffset,
calc_ax_offset(offs, (void*)cb_hidden->mixbufs[0]),
calc_ax_offset(offs, (void*)cb_hidden->mixbufs[0] + cb_this->spec.size),
cb_this->spec.size, (void*)cb_hidden->mixbufs[0],
calc_ax_offset(offs, (void*)cb_hidden->mixbufs[1]),
calc_ax_offset(offs, (void*)cb_hidden->mixbufs[1] + cb_this->spec.size),
cb_this->spec.size, (void*)cb_hidden->mixbufs[1]);*/
printf("DEBUG: Playing an invalid buffer? This is not a good sign.\n");
playing_buffer = 0;
}
if (playing_buffer < 0 || playing_buffer >= NUM_BUFFERS) {
/* UM */
/* Uncomment for craploads of debug info */
/*printf("bad buffer %d\n" "|> %08X, %08X-%08X\n" \
"0: xxxxxxxx, %08X-%08X (%08X@%08X)\n" \
"1: xxxxxxxx, %08X-%08X (%08X@%08X)\n", \
playing_buffer, offs.currentOffset, offs.loopOffset, offs.endOffset,
calc_ax_offset(offs, (void*)cb_hidden->mixbufs[0]),
calc_ax_offset(offs, (void*)cb_hidden->mixbufs[0] + cb_this->spec.size),
cb_this->spec.size, (void*)cb_hidden->mixbufs[0],
calc_ax_offset(offs, (void*)cb_hidden->mixbufs[1]),
calc_ax_offset(offs, (void*)cb_hidden->mixbufs[1] + cb_this->spec.size),
cb_this->spec.size, (void*)cb_hidden->mixbufs[1]);*/
printf("DEBUG: Playing an invalid buffer? This is not a good sign.\n");
playing_buffer = 0;
}

/* Make sure playingid is in sync with the hardware */
cb_hidden->playingid = playing_buffer;
/* Make sure playingid is in sync with the hardware */
dev->hidden->playingid = playing_buffer;

/* Make sure the end offset is correct for the playing buffer */
for (int i = 0; i < cb_this->spec.channels; i++) {
/* Calculate end address, aka start of the next (i+1) channel's buffer */
endaddr = cb_hidden->mixbufs[cb_hidden->playingid] +
(cb_this->spec.samples * sizeof_sample(offs[i]) * (i + 1));
/* Make sure the end offset is correct for the playing buffer */
for (int i = 0; i < dev->spec.channels; i++) {
/* Calculate end address, aka start of the next (i+1) channel's buffer */
endaddr = dev->hidden->mixbufs[dev->hidden->playingid] +
(dev->spec.samples * sizeof_sample(offs[i]) * (i + 1));

/* Trial end error to try and limit popping */
endaddr -= 2;
/* Trial end error to try and limit popping */
endaddr -= 2;

AXSetVoiceEndOffset(
cb_hidden->voice[i],
calc_ax_offset(offs[i], endaddr)
);
AXSetVoiceEndOffset(
dev->hidden->voice[i],
calc_ax_offset(offs[i], endaddr)
);

/* The next buffer is good to go, set the loop offset */
if (cb_hidden->renderingid != next_id(cb_hidden->playingid)) {
/* Calculate start address for this channel's buffer */
void* loopaddr = cb_hidden->mixbufs[next_id(cb_hidden->playingid)] +
(cb_this->spec.samples * sizeof_sample(offs[i]) * i);
/* The next buffer is good to go, set the loop offset */
if (dev->hidden->renderingid != next_id(dev->hidden->playingid)) {
/* Calculate start address for this channel's buffer */
void* loopaddr = dev->hidden->mixbufs[next_id(dev->hidden->playingid)] +
(dev->spec.samples * sizeof_sample(offs[i]) * i);

AXSetVoiceLoopOffset(cb_hidden->voice[i], calc_ax_offset(offs[i], loopaddr));
/* Otherwise, make sure the loop offset is correct for the playing buffer */
} else {
void* loopaddr = cb_hidden->mixbufs[cb_hidden->playingid] +
(cb_this->spec.samples * sizeof_sample(offs[i]) * i);
AXSetVoiceLoopOffset(dev->hidden->voice[i], calc_ax_offset(offs[i], loopaddr));
/* Otherwise, make sure the loop offset is correct for the playing buffer */
} else {
void* loopaddr = dev->hidden->mixbufs[dev->hidden->playingid] +
(dev->spec.samples * sizeof_sample(offs[i]) * i);

AXSetVoiceLoopOffset(cb_hidden->voice[i], calc_ax_offset(offs[i], loopaddr));
AXSetVoiceLoopOffset(dev->hidden->voice[i], calc_ax_offset(offs[i], loopaddr));
}
}
}


}

static void WIIUAUDIO_PlayDevice(_THIS) {
Expand Down Expand Up @@ -427,7 +499,7 @@ static Uint8* WIIUAUDIO_GetDeviceBuf(_THIS) {
}

static void WIIUAUDIO_CloseDevice(_THIS) {
if (AXIsInit()) {
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@GaryOderNichts GaryOderNichts Nov 26, 2025 •
edited
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I'd probably make AX (de-)initialization completely independent from opening and closing devices, by moving it into WIIUAUDIO_Init and the Deinitialize callback.

if ((AXIsInit()) && (deviceCount < 1)) {
AXDeregisterAppFrameCallback(_WIIUAUDIO_framecallback);
for (int i = 0; i < SIZEOF_ARR(this->hidden->voice); i++) {
if (this->hidden->voice[i]) {
Expand All @@ -440,6 +512,8 @@ static void WIIUAUDIO_CloseDevice(_THIS) {
if (this->hidden->mixbufs[0]) free(this->hidden->mixbufs[0]);
if (this->hidden->deintvbuf) SDL_free(this->hidden->deintvbuf);
SDL_free(this->hidden);

deviceCount--;
}

static void WIIUAUDIO_ThreadInit(_THIS) {
Expand All @@ -451,14 +525,17 @@ static void WIIUAUDIO_ThreadInit(_THIS) {
}

static SDL_bool WIIUAUDIO_Init(SDL_AudioDriverImpl *impl) {
impl->DetectDevices = WIIUAUDIO_DetectDevices;
impl->OpenDevice = WIIUAUDIO_OpenDevice;
impl->PlayDevice = WIIUAUDIO_PlayDevice;
impl->WaitDevice = WIIUAUDIO_WaitDevice;
impl->GetDeviceBuf = WIIUAUDIO_GetDeviceBuf;
impl->CloseDevice = WIIUAUDIO_CloseDevice;
impl->ThreadInit = WIIUAUDIO_ThreadInit;

impl->OnlyHasDefaultOutputDevice = SDL_TRUE;
impl->OnlyHasDefaultOutputDevice = SDL_FALSE;

deviceCount = 0;

return SDL_TRUE;
}
Expand All @@ -467,4 +544,4 @@ AudioBootStrap WIIUAUDIO_bootstrap = {
WIIUAUDIO_DRIVER_NAME, "Wii U AX Audio Driver", WIIUAUDIO_Init, 0,
};

#endif //SDL_AUDIO_DRIVER_WIIU
#endif //SDL_AUDIO_DRIVER_WIIU