camera: Reenabled macOS/iOS support, with rewritten CoreMedia impleme…

…ntation.

include/SDL3/SDL_camera.h

@@ -66,8 +66,8 @@ typedef struct SDL_CameraSpec
     Uint32 format;          /**< Frame SDL_PixelFormatEnum format */
     int width;              /**< Frame width */
     int height;             /**< Frame height */
-    int interval_numerator;  /**< Frame rate numerator ((dom / num) == fps) */
-    int interval_denominator;  /**< Frame rate demoninator ((dom / num) == fps)*/
+    int interval_numerator;  /**< Frame rate numerator ((dom / num) == fps, (num / dom) == duration) */
+    int interval_denominator;  /**< Frame rate demoninator ((dom / num) == fps, (num / dom) == duration) */
 } SDL_CameraSpec;
 
 /**

include/build_config/SDL_build_config.h.cmake

@@ -246,8 +246,6 @@
 
 #cmakedefine USE_POSIX_SPAWN @USE_POSIX_SPAWN@
 
-#cmakedefine HAVE_COREMEDIA
-
 /* SDL internal assertion support */
 #if @SDL_DEFAULT_ASSERT_LEVEL_CONFIGURED@
 #cmakedefine SDL_DEFAULT_ASSERT_LEVEL @SDL_DEFAULT_ASSERT_LEVEL@

include/build_config/SDL_build_config_ios.h

@@ -197,8 +197,6 @@
 #define SDL_VIDEO_METAL 1
 #endif
 
-#define HAVE_COREMEDIA  1
-
 /* Enable system power support */
 #define SDL_POWER_UIKIT 1
 
@@ -212,6 +210,10 @@
 #define SDL_FILESYSTEM_COCOA   1
 
 /* enable camera support */
+#ifndef SDL_PLATFORM_TVOS
 #define SDL_CAMERA_DRIVER_COREMEDIA 1
+#endif
+
+#define SDL_CAMERA_DRIVER_DUMMY 1
 
 #endif /* SDL_build_config_ios_h_ */

include/build_config/SDL_build_config_macos.h

@@ -260,8 +260,6 @@
 #endif
 #endif
 
-#define HAVE_COREMEDIA  1
-
 /* Enable system power support */
 #define SDL_POWER_MACOSX 1
 

src/camera/SDL_camera.c

@@ -73,6 +73,12 @@ const char *SDL_GetCurrentCameraDriver(void)
     return camera_driver.name;
 }
 
+char *SDL_GetCameraThreadName(SDL_CameraDevice *device, char *buf, size_t buflen)
+{
+    (void)SDL_snprintf(buf, buflen, "SDLCamera%d", (int) device->instance_id);
+    return buf;
+}
+
 int SDL_AddCameraFormat(CameraFormatAddData *data, Uint32 fmt, int w, int h, int interval_numerator, int interval_denominator)
 {
     SDL_assert(data != NULL);
@@ -683,7 +689,7 @@ SDL_bool SDL_CameraThreadIterate(SDL_CameraDevice *device)
         failed = SDL_TRUE;
     }
 
-    // we can let go of the lock once we've tried to grab a frame of video and maybe moved the output frame from the empty to the filled list.
+    // we can let go of the lock once we've tried to grab a frame of video and maybe moved the output frame off the empty list.
     // this lets us chew up the CPU for conversion and scaling without blocking other threads.
     SDL_UnlockMutex(device->lock);
 
@@ -988,7 +994,7 @@ SDL_Camera *SDL_OpenCameraDevice(SDL_CameraDeviceID instance_id, const SDL_Camer
     // Start the camera thread if necessary
     if (!camera_driver.impl.ProvidesOwnCallbackThread) {
         char threadname[64];
-        SDL_snprintf(threadname, sizeof (threadname), "SDLCamera%d", (int) instance_id);
+        SDL_GetCameraThreadName(device, threadname, sizeof (threadname));
         device->thread = SDL_CreateThreadInternal(CameraThread, threadname, 0, device);
         if (!device->thread) {
             ClosePhysicalCameraDevice(device);

src/camera/SDL_syscamera.h

@@ -28,10 +28,7 @@
 #define DEBUG_CAMERA 0
 
 
-// !!! FIXME: update these drivers!
-#ifdef SDL_CAMERA_DRIVER_COREMEDIA
-#undef SDL_CAMERA_DRIVER_COREMEDIA
-#endif
+// !!! FIXME: update this driver!
 #ifdef SDL_CAMERA_DRIVER_ANDROID
 #undef SDL_CAMERA_DRIVER_ANDROID
 #endif
@@ -53,6 +50,9 @@ extern SDL_CameraDevice *SDL_FindPhysicalCameraDeviceByCallback(SDL_bool (*callb
 // Backends should call this when the user has approved/denied access to a camera.
 extern void SDL_CameraDevicePermissionOutcome(SDL_CameraDevice *device, SDL_bool approved);
 
+// Backends can call this to get a standardized name for a thread to power a specific camera device.
+extern char *SDL_GetCameraThreadName(SDL_CameraDevice *device, char *buf, size_t buflen);
+
 // These functions are the heart of the camera threads. Backends can call them directly if they aren't using the SDL-provided thread.
 extern void SDL_CameraThreadSetup(SDL_CameraDevice *device);
 extern SDL_bool SDL_CameraThreadIterate(SDL_CameraDevice *device);