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SDL2: Add wakeup callback.

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This commit is contained in:
David Reid
2025-12-20 18:21:31 +10:00
parent 2f18c53771
commit ad7084c9ef
2 changed files with 64 additions and 25 deletions
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extras/backends/sdl/backend_sdl.c
+39 -22
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@@ -169,7 +169,7 @@ static ma_device_state_sdl* ma_device_get_backend_state__sdl(ma_device* pDevice)
}
static ma_result ma_device_step__sdl(ma_device* pDevice);
static ma_result ma_device_step__sdl(ma_device* pDevice, ma_blocking_mode blockingMode);
static void ma_backend_info__sdl(ma_device_backend_info* pBackendInfo)
@@ -562,7 +562,7 @@ static ma_result ma_device_start__sdl(ma_device* pDevice)
ma_device_type deviceType = ma_device_get_type(pDevice);
/* Step the device once to ensure buffers are pre-filled before starting. */
ma_device_step__sdl(pDevice);
ma_device_step__sdl(pDevice, MA_BLOCKING_MODE_NON_BLOCKING);
if (deviceType == ma_device_type_capture || deviceType == ma_device_type_duplex) {
pContextStateSDL->SDL_PauseAudioDevice(pDeviceStateSDL->capture.deviceID, 0);
@@ -593,18 +593,39 @@ static ma_result ma_device_stop__sdl(ma_device* pDevice)
}
static ma_result ma_device_wait__sdl(ma_device* pDevice)
static ma_result ma_device_step__sdl(ma_device* pDevice, ma_blocking_mode blockingMode)
{
ma_device_state_sdl* pDeviceStateSDL = ma_device_get_backend_state__sdl(pDevice);
ma_device_state_async_wait(&pDeviceStateSDL->async);
return MA_SUCCESS;
}
for (;;) {
ma_result result;
if (blockingMode == MA_BLOCKING_MODE_BLOCKING) {
ma_device_state_async_wait(&pDeviceStateSDL->async);
}
if (!ma_device_is_started(pDevice)) {
return MA_DEVICE_NOT_STARTED;
}
result = ma_device_state_async_step(&pDeviceStateSDL->async, pDevice);
if (result == MA_SUCCESS) {
break;
}
if (result != MA_NO_DATA_AVAILABLE) {
return result;
}
/* Getting here means no data was processed. In non-blocking mode we don't care, just get out of the loop. */
if (blockingMode == MA_BLOCKING_MODE_NON_BLOCKING) {
break;
}
/* Getting here means we're in blocking mode and no data was processed. In this case we'd rather keep waiting for data to be available. */
continue;
}
static ma_result ma_device_step__sdl(ma_device* pDevice)
{
ma_device_state_sdl* pDeviceStateSDL = ma_device_get_backend_state__sdl(pDevice);
ma_device_state_async_step(&pDeviceStateSDL->async, pDevice);
return MA_SUCCESS;
}
@@ -612,23 +633,19 @@ static ma_result ma_device_step__sdl(ma_device* pDevice)
static void ma_device_loop__sdl(ma_device* pDevice)
{
for (;;) {
ma_result result = ma_device_wait__sdl(pDevice);
if (result != MA_SUCCESS) {
break;
}
/* If the wait terminated due to the device being stopped, abort now. */
if (!ma_device_is_started(pDevice)) {
break;
}
result = ma_device_step__sdl(pDevice);
ma_result result = ma_device_step__sdl(pDevice, MA_BLOCKING_MODE_BLOCKING);
if (result != MA_SUCCESS) {
break;
}
}
}
static void ma_device_wake__sdl(ma_device* pDevice)
{
ma_device_state_sdl* pDeviceStateSDL = ma_device_get_backend_state__sdl(pDevice);
ma_device_state_async_release(&pDeviceStateSDL->async);
}
static ma_device_backend_vtable ma_gDeviceBackendVTable_SDL =
{
@@ -643,7 +660,7 @@ static ma_device_backend_vtable ma_gDeviceBackendVTable_SDL =
NULL, /* onDeviceRead */
NULL, /* onDeviceWrite */
ma_device_loop__sdl,
NULL /* onDeviceWakeup */
ma_device_wake__sdl
};
ma_device_backend_vtable* ma_device_backend_sdl = &ma_gDeviceBackendVTable_SDL;