Get the list of native formats/sizes a camera supports.
Defined in <SDL3/SDL_camera.h>
| devid | the camera device instance ID to query. |
| count | a pointer filled in with the number of elements in the list. Can be NULL. |
Returns a 0 terminated array of SDL_CameraSpecs, which should be freed with SDL_free(), or NULL on error; call SDL_GetError() for more details.
This returns a list of all formats and frame sizes that a specific camera can offer. This is useful if your app can accept a variety of image formats and sizes and so want to find the optimal spec that doesn't require conversion.
This function isn't strictly required; if you call SDL_OpenCameraDevice with a NULL spec, SDL will choose a native format for you, and if you instead specify a desired format, it will transparently convert to the requested format on your behalf.
If count is not NULL, it will be filled with the number of elements in the returned array. Additionally, the last element of the array has all fields set to zero (this element is not included in count).
The returned list is owned by the caller, and should be released with SDL_free() when no longer needed.
Note that it's legal for a camera to supply a list with only the zeroed final element and *count set to zero; this is what will happen on Emscripten builds, since that platform won't tell anything about available cameras until you've opened one, and won't even tell if there is a camera until the user has given you permission to check through a scary warning popup.
It is safe to call this function from any thread.
This function is available since SDL 3.0.0.