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wasapi/win32: Sort initial device lists by device GUID.

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This makes an unchanged set of hardware always report devices in the same
order on each run.
This commit is contained in:
Ryan C. Gordon 2018-10-21 22:40:17 -04:00
parent 1ec56f7302
commit 4a50a04213
1 changed files with 54 additions and 8 deletions
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62
src/audio/wasapi/SDL_wasapi_win32.c
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@ -351,10 +351,42 @@ WASAPI_ActivateDevice(_THIS, const SDL_bool isrecovery)
}
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"
@ -369,22 +401,36 @@ WASAPI_EnumerateEndpointsForFlow(const SDL_bool iscapture)
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))) {
LPWSTR devid = NULL;
if (SUCCEEDED(IMMDevice_GetId(device, &devid))) {
char *devname = GetWasapiDeviceName(device);
if (devname) {
WASAPI_AddDevice(iscapture, devname, devid);
SDL_free(devname);
}
CoTaskMemFree(devid);
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);
}