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Allow specifying only some SDL_CameraSpec fields when opening a camera 

This allows setting the size without format, or FPS without size, etc.
This commit is contained in:
Sam Lantinga 2024-05-02 12:25:39 -07:00
parent 861815e51d
commit d4dc613559
1 changed files with 40 additions and 35 deletions
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75
src/camera/SDL_camera.c
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@ -948,34 +948,38 @@ static void ChooseBestCameraSpec(SDL_CameraDevice *device, const SDL_CameraSpec
int wantw = spec->width;
int wanth = spec->height;
// Find the sizes with the closest aspect ratio and then find the best fit of those.
const float wantaspect = ((float)wantw) / ((float) wanth);
const float epsilon = 1e-6f;
float closestaspect = -9999999.0f;
float closestdiff = 999999.0f;
int closestdiffw = 9999999;
if (wantw > 0 && wanth > 0) {
// Find the sizes with the closest aspect ratio and then find the best fit of those.
const float wantaspect = ((float)wantw) / ((float)wanth);
const float epsilon = 1e-6f;
float closestaspect = -9999999.0f;
float closestdiff = 999999.0f;
int closestdiffw = 9999999;
for (int i = 0; i < num_specs; i++) {
const SDL_CameraSpec *thisspec = &device->all_specs[i];
const int thisw = thisspec->width;
const int thish = thisspec->height;
const float thisaspect = ((float)thisw) / ((float) thish);
const float aspectdiff = SDL_fabs(wantaspect - thisaspect);
const float diff = SDL_fabs(closestaspect - thisaspect);
const int diffw = SDL_abs(thisw - wantw);
if (diff < epsilon) { // matches current closestaspect? See if resolution is closer in size.
if (diffw < closestdiffw) {
for (int i = 0; i < num_specs; i++) {
const SDL_CameraSpec *thisspec = &device->all_specs[i];
const int thisw = thisspec->width;
const int thish = thisspec->height;
const float thisaspect = ((float)thisw) / ((float)thish);
const float aspectdiff = SDL_fabs(wantaspect - thisaspect);
const float diff = SDL_fabs(closestaspect - thisaspect);
const int diffw = SDL_abs(thisw - wantw);
if (diff < epsilon) { // matches current closestaspect? See if resolution is closer in size.
if (diffw < closestdiffw) {
closestdiffw = diffw;
closest->width = thisw;
closest->height = thish;
}
} else if (aspectdiff < closestdiff) { // this is a closer aspect ratio? Take it, reset resolution checks.
closestdiff = aspectdiff;
closestaspect = thisaspect;
closestdiffw = diffw;
closest->width = thisw;
closest->height = thish;
}
} else if (aspectdiff < closestdiff) { // this is a closer aspect ratio? Take it, reset resolution checks.
closestdiff = aspectdiff;
closestaspect = thisaspect;
closestdiffw = diffw;
closest->width = thisw;
closest->height = thish;
}
} else {
SDL_copyp(closest, &device->all_specs[0]);
}
SDL_assert(closest->width > 0);
@ -1030,16 +1034,6 @@ static void ChooseBestCameraSpec(SDL_CameraDevice *device, const SDL_CameraSpec
SDL_Camera *SDL_OpenCameraDevice(SDL_CameraDeviceID instance_id, const SDL_CameraSpec *spec)
{
if (spec) {
if ((spec->width <= 0) || (spec->height <= 0)) {
SDL_SetError("Requested spec frame size is invalid");
return NULL;
} else if (spec->format == SDL_PIXELFORMAT_UNKNOWN) {
SDL_SetError("Requested spec format is invalid");
return NULL;
}
}
SDL_CameraDevice *device = ObtainPhysicalCameraDevice(instance_id);
if (!device) {
return NULL;
@ -1073,10 +1067,21 @@ SDL_Camera *SDL_OpenCameraDevice(SDL_CameraDeviceID instance_id, const SDL_Camer
return NULL;
}
if (!spec) {
SDL_copyp(&device->spec, &closest);
} else {
if (spec) {
SDL_copyp(&device->spec, spec);
if (spec->width <= 0 || spec->height <= 0) {
device->spec.width = closest.width;
device->spec.height = closest.height;
}
if (spec->format == SDL_PIXELFORMAT_UNKNOWN) {
device->spec.format = closest.format;
}
if (spec->interval_denominator == 0) {
device->spec.interval_numerator = closest.interval_numerator;
device->spec.interval_denominator = closest.interval_denominator;
}
} else {
SDL_copyp(&device->spec, &closest);
}
SDL_copyp(&device->actual_spec, &closest);