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camera: Reworked to operate with a driver interface, like other subsystems.

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This commit is contained in:
Ryan C. Gordon
2023-12-01 10:59:13 -05:00
parent 2ad44bd162
commit cb10c80aaf
25 changed files with 608 additions and 332 deletions
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65
src/camera/SDL_syscamera.h
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@@ -25,6 +25,8 @@
#include "../SDL_list.h"
#define DEBUG_CAMERA 1
// The SDL camera driver
typedef struct SDL_CameraDevice SDL_CameraDevice;
@@ -57,34 +59,45 @@ struct SDL_CameraDevice
struct SDL_PrivateCameraData *hidden;
};
extern int SDL_SYS_CameraInit(void);
extern int SDL_SYS_CameraQuit(void);
typedef struct SDL_CameraDriverImpl
{
void (*DetectDevices)(void);
int (*OpenDevice)(SDL_CameraDevice *_this);
void (*CloseDevice)(SDL_CameraDevice *_this);
int (*InitDevice)(SDL_CameraDevice *_this);
int (*GetDeviceSpec)(SDL_CameraDevice *_this, SDL_CameraSpec *spec);
int (*StartCamera)(SDL_CameraDevice *_this);
int (*StopCamera)(SDL_CameraDevice *_this);
int (*AcquireFrame)(SDL_CameraDevice *_this, SDL_CameraFrame *frame);
int (*ReleaseFrame)(SDL_CameraDevice *_this, SDL_CameraFrame *frame);
int (*GetNumFormats)(SDL_CameraDevice *_this);
int (*GetFormat)(SDL_CameraDevice *_this, int index, Uint32 *format);
int (*GetNumFrameSizes)(SDL_CameraDevice *_this, Uint32 format);
int (*GetFrameSize)(SDL_CameraDevice *_this, Uint32 format, int index, int *width, int *height);
int (*GetDeviceName)(SDL_CameraDeviceID instance_id, char *buf, int size);
SDL_CameraDeviceID *(*GetDevices)(int *count);
void (*Deinitialize)(void);
} SDL_CameraDriverImpl;
// !!! FIXME: These names need to be made camera-specific.
typedef struct SDL_CameraDriver
{
const char *name; // The name of this camera driver
const char *desc; // The description of this camera driver
SDL_CameraDriverImpl impl; // the backend's interface
} SDL_CameraDriver;
extern int OpenDevice(SDL_CameraDevice *_this);
extern void CloseDevice(SDL_CameraDevice *_this);
typedef struct CameraBootStrap
{
const char *name;
const char *desc;
SDL_bool (*init)(SDL_CameraDriverImpl *impl);
SDL_bool demand_only; // if SDL_TRUE: request explicitly, or it won't be available.
} CameraBootStrap;
extern int InitDevice(SDL_CameraDevice *_this);
extern int GetDeviceSpec(SDL_CameraDevice *_this, SDL_CameraSpec *spec);
extern int StartCamera(SDL_CameraDevice *_this);
extern int StopCamera(SDL_CameraDevice *_this);
extern int AcquireFrame(SDL_CameraDevice *_this, SDL_CameraFrame *frame);
extern int ReleaseFrame(SDL_CameraDevice *_this, SDL_CameraFrame *frame);
extern int GetNumFormats(SDL_CameraDevice *_this);
extern int GetFormat(SDL_CameraDevice *_this, int index, Uint32 *format);
extern int GetNumFrameSizes(SDL_CameraDevice *_this, Uint32 format);
extern int GetFrameSize(SDL_CameraDevice *_this, Uint32 format, int index, int *width, int *height);
extern int GetCameraDeviceName(SDL_CameraDeviceID instance_id, char *buf, int size);
extern SDL_CameraDeviceID *GetCameraDevices(int *count);
extern SDL_bool CheckAllDeviceClosed(void);
extern SDL_bool CheckDevicePlaying(void);
// Not all of these are available in a given build. Use #ifdefs, etc.
extern CameraBootStrap DUMMYCAMERA_bootstrap;
extern CameraBootStrap V4L2_bootstrap;
extern CameraBootStrap COREMEDIA_bootstrap;
extern CameraBootStrap ANDROIDCAMERA_bootstrap;
#endif // SDL_syscamera_h_