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Improve default device enumeration with the SDL2 backend.

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This commit is contained in:
David Reid
2026-01-01 19:36:37 +10:00
parent d0392288c4
commit e9fad62f44
1 changed files with 75 additions and 13 deletions
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extras/backends/sdl/backend_sdl.c
+75 -13
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@@ -298,22 +298,36 @@ static ma_result ma_context_enumerate_devices__sdl(ma_context* pContext, ma_enum
{
ma_context_state_sdl* pContextStateSDL = ma_context_get_backend_state__sdl(pContext);
ma_device_enumeration_result cbResult = MA_DEVICE_ENUMERATION_CONTINUE;
MA_SDL_AudioSpec defaultAudioSpec;
ma_device_info deviceInfo;
int deviceCount;
int iDevice;
MA_SDL_ASSERT(pContextStateSDL != NULL);
/* Playback */
if (cbResult == MA_DEVICE_ENUMERATION_CONTINUE) {
int deviceCount = pContextStateSDL->SDL_GetNumAudioDevices(0);
for (iDevice = 0; iDevice < deviceCount; ++iDevice) {
ma_device_info deviceInfo;
ma_bool32 hasDefaultPlaybackDeviceBeenEnumerated = MA_FALSE;
ma_bool32 hasDefaultPlaybackDevice;
char* pDefaultPlaybackDeviceName = NULL;
hasDefaultPlaybackDevice = pContextStateSDL->SDL_GetDefaultAudioInfo(&pDefaultPlaybackDeviceName, &defaultAudioSpec, 0) == 0;
deviceCount = pContextStateSDL->SDL_GetNumAudioDevices(0);
for (iDevice = 0; iDevice < deviceCount; iDevice += 1) {
MA_SDL_AudioSpec audioSpec;
memset(&deviceInfo, 0, sizeof(deviceInfo));
/* Default. */
if (iDevice == 0) { /* <-- Is this correct? Should we instead compare against the name from SDL_GetDefaultAudioInfo()? */
deviceInfo.isDefault = MA_TRUE;
/* Default. For SDL2 we'll just use the first device that matches the default device name. */
if (!hasDefaultPlaybackDeviceBeenEnumerated && hasDefaultPlaybackDevice) {
const char* pDeviceName = pContextStateSDL->SDL_GetAudioDeviceName(iDevice, 0);
if (ma_strcmp(pDeviceName, pDefaultPlaybackDeviceName) == 0) {
deviceInfo.isDefault = MA_TRUE;
hasDefaultPlaybackDeviceBeenEnumerated = MA_TRUE;
}
} else {
deviceInfo.isDefault = MA_FALSE;
}
/* ID. */
@@ -337,20 +351,49 @@ static ma_result ma_context_enumerate_devices__sdl(ma_context* pContext, ma_enum
break;
}
}
/* SDL2 does not flag the default playback device so we'll enumerate an explicit default device here. */
if (cbResult == MA_DEVICE_ENUMERATION_CONTINUE && !hasDefaultPlaybackDeviceBeenEnumerated) {
memset(&deviceInfo, 0, sizeof(deviceInfo));
deviceInfo.isDefault = MA_TRUE;
deviceInfo.id.custom.i = -1; /* Special ID for the default device. */
if (hasDefaultPlaybackDevice) {
ma_strncpy_s(deviceInfo.name, sizeof(deviceInfo.name), pDefaultPlaybackDeviceName, (size_t)-1);
ma_add_native_format_from_AudioSpec__sdl(&deviceInfo, &defaultAudioSpec);
} else {
/* No way to retrieve the data format. Just report support for everything. */
ma_strncpy_s(deviceInfo.name, sizeof(deviceInfo.name), "Default Playback Device", (size_t)-1);
deviceInfo.nativeDataFormatCount = 1;
}
cbResult = callback(ma_device_type_playback, &deviceInfo, pCallbackUserData);
}
}
/* Capture */
if (cbResult == MA_DEVICE_ENUMERATION_CONTINUE) {
int deviceCount = pContextStateSDL->SDL_GetNumAudioDevices(1);
for (iDevice = 0; iDevice < deviceCount; ++iDevice) {
ma_device_info deviceInfo;
ma_bool32 hasDefaultCaptureDeviceBeenEnumerated = MA_FALSE;
ma_bool32 hasDefaultCaptureDevice;
char* pDefaultCaptureDeviceName = NULL;
hasDefaultCaptureDevice = pContextStateSDL->SDL_GetDefaultAudioInfo(&pDefaultCaptureDeviceName, &defaultAudioSpec, 1) == 0;
deviceCount = pContextStateSDL->SDL_GetNumAudioDevices(1);
for (iDevice = 0; iDevice < deviceCount; iDevice += 1) {
MA_SDL_AudioSpec audioSpec;
memset(&deviceInfo, 0, sizeof(deviceInfo));
/* Default. */
if (iDevice == 0) { /* <-- Is this correct? Should we instead compare against the name from SDL_GetDefaultAudioInfo()? */
deviceInfo.isDefault = MA_TRUE;
/* Default. For SDL2 we'll just use the first device that matches the default device name. */
if (!hasDefaultCaptureDeviceBeenEnumerated && hasDefaultCaptureDevice) {
const char* pDeviceName = pContextStateSDL->SDL_GetAudioDeviceName(iDevice, 1);
if (ma_strcmp(pDeviceName, pDefaultCaptureDeviceName) == 0) {
deviceInfo.isDefault = MA_TRUE;
hasDefaultCaptureDeviceBeenEnumerated = MA_TRUE;
}
} else {
deviceInfo.isDefault = MA_FALSE;
}
/* ID. */
@@ -374,6 +417,24 @@ static ma_result ma_context_enumerate_devices__sdl(ma_context* pContext, ma_enum
break;
}
}
/* SDL2 does not flag the default playback device so we'll enumerate an explicit default device here. */
if (cbResult == MA_DEVICE_ENUMERATION_CONTINUE && !hasDefaultCaptureDeviceBeenEnumerated) {
memset(&deviceInfo, 0, sizeof(deviceInfo));
deviceInfo.isDefault = MA_TRUE;
deviceInfo.id.custom.i = -1; /* Special ID for the default device. */
if (hasDefaultCaptureDevice) {
ma_strncpy_s(deviceInfo.name, sizeof(deviceInfo.name), pDefaultCaptureDeviceName, (size_t)-1);
ma_add_native_format_from_AudioSpec__sdl(&deviceInfo, &defaultAudioSpec);
} else {
/* No way to retrieve the data format. Just report support for everything. */
ma_strncpy_s(deviceInfo.name, sizeof(deviceInfo.name), "Default Capture Device", (size_t)-1);
deviceInfo.nativeDataFormatCount = 1;
}
cbResult = callback(ma_device_type_capture, &deviceInfo, pCallbackUserData);
}
}
return MA_SUCCESS;
@@ -451,8 +512,9 @@ static ma_result ma_device_init_internal__sdl(ma_device* pDevice, ma_context_sta
desiredSpec.format = MA_AUDIO_F32;
}
/* We explicitly want the device name to be NULL for the default device. Otherwise we'll grab the name from the device index. */
pDeviceName = NULL;
if (pDescriptor->pDeviceID != NULL) {
if (pDescriptor->pDeviceID != NULL && pDescriptor->pDeviceID->custom.i != -1) {
pDeviceName = pContextStateSDL->SDL_GetAudioDeviceName(pDescriptor->pDeviceID->custom.i, (deviceType == ma_device_type_playback) ? 0 : 1);
}