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camera: Disconnected cameras become zombies that feed blank frames.

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This commit is contained in:
Ryan C. Gordon
2024-02-19 12:18:00 -05:00
parent 2613e3da24
commit bdcddf4810
2 changed files with 152 additions and 18 deletions
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8
src/camera/SDL_syscamera.h
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@@ -85,6 +85,11 @@ struct SDL_CameraDevice
// When refcount hits zero, we destroy the device object.
SDL_AtomicInt refcount;
// These are, initially, set from camera_driver, but we might swap them out with Zombie versions on disconnect/failure.
int (*WaitDevice)(SDL_CameraDevice *device);
int (*AcquireFrame)(SDL_CameraDevice *device, SDL_Surface *frame, Uint64 *timestampNS);
void (*ReleaseFrame)(SDL_CameraDevice *device, SDL_Surface *frame);
// All supported formats/dimensions for this device.
SDL_CameraSpec *all_specs;
@@ -124,6 +129,9 @@ struct SDL_CameraDevice
SurfaceList empty_output_surfaces; // this is LIFO
SurfaceList app_held_output_surfaces;
// A fake video frame we allocate if the camera fails/disconnects.
Uint8 *zombie_pixels;
// non-zero if acquire_surface needs to be scaled for final output.
int needs_scaling; // -1: downscale, 0: no scaling, 1: upscale