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camera: Windows support, through the Media Foundation API!

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This commit is contained in:
Ryan C. Gordon
2024-01-31 15:07:07 -05:00
parent 3dca8a03da
commit 7191a97fe3
11 changed files with 998 additions and 44 deletions
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40
src/camera/SDL_camera.c
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@@ -43,6 +43,9 @@ static const CameraBootStrap *const bootstrap[] = {
#ifdef SDL_CAMERA_DRIVER_EMSCRIPTEN
&EMSCRIPTENCAMERA_bootstrap,
#endif
#ifdef SDL_CAMERA_DRIVER_MEDIAFOUNDATION
&MEDIAFOUNDATION_bootstrap,
#endif
#ifdef SDL_CAMERA_DRIVER_DUMMY
&DUMMYCAMERA_bootstrap,
#endif
@@ -70,6 +73,32 @@ const char *SDL_GetCurrentCameraDriver(void)
return camera_driver.name;
}
int SDL_AddCameraFormat(CameraFormatAddData *data, Uint32 fmt, int w, int h, int interval_numerator, int interval_denominator)
{
SDL_assert(data != NULL);
if (data->allocated_specs <= data->num_specs) {
const int newalloc = data->allocated_specs ? (data->allocated_specs * 2) : 16;
void *ptr = SDL_realloc(data->specs, sizeof (SDL_CameraSpec) * newalloc);
if (!ptr) {
return -1;
}
data->specs = (SDL_CameraSpec *) ptr;
data->allocated_specs = newalloc;
}
SDL_CameraSpec *spec = &data->specs[data->num_specs];
spec->format = fmt;
spec->width = w;
spec->height = h;
spec->interval_numerator = interval_numerator;
spec->interval_denominator = interval_denominator;
data->num_specs++;
return 0;
}
static void ClosePhysicalCameraDevice(SDL_CameraDevice *device)
{
if (!device) {
@@ -610,10 +639,13 @@ SDL_bool SDL_CameraThreadIterate(SDL_CameraDevice *device)
if (rc == 1) { // new frame acquired!
#if DEBUG_CAMERA
SDL_Log("CAMERA: New frame available!");
SDL_Log("CAMERA: New frame available! pixels=%p pitch=%d", device->acquire_surface->pixels, device->acquire_surface->pitch);
#endif
if (device->drop_frames > 0) {
#if DEBUG_CAMERA
SDL_Log("CAMERA: Dropping an initial frame");
#endif
device->drop_frames--;
camera_driver.impl.ReleaseFrame(device, device->acquire_surface);
device->acquire_surface->pixels = NULL;
@@ -662,9 +694,15 @@ SDL_bool SDL_CameraThreadIterate(SDL_CameraDevice *device)
} else if (acquired) { // we have a new frame, scale/convert if necessary and queue it for the app!
SDL_assert(slist != NULL);
if (!device->needs_scaling && !device->needs_conversion) { // no conversion needed? Just move the pointer/pitch into the output surface.
#if DEBUG_CAMERA
SDL_Log("CAMERA: Frame is going through without conversion!");
#endif
output_surface->pixels = acquired->pixels;
output_surface->pitch = acquired->pitch;
} else { // convert/scale into a different surface.
#if DEBUG_CAMERA
SDL_Log("CAMERA: Frame is getting converted!");
#endif
SDL_Surface *srcsurf = acquired;
if (device->needs_scaling == -1) { // downscaling? Do it first. -1: downscale, 0: no scaling, 1: upscale
SDL_Surface *dstsurf = device->needs_conversion ? device->conversion_surface : output_surface;