IC4_QUEUESINK_CONFIG Struct Reference

Configures the behavior of a queue sink. More...

Data Fields
struct IC4_QUEUESINK_CALLBACKS	callbacks
	A structure containing function pointers to customize the sink's behavior.
void *	callback_context
	A user-defined value that is passed to the callbacks.
enum IC4_PIXEL_FORMAT *	pixel_formats
	An array of possible pixel formats that the sink can receive.
size_t	num_pixel_formats
	Length of the pixel_formats array.
struct IC4_ALLOCATOR_CALLBACKS	allocator
	A structure containing function pointers to customize the sink's allocator.
void *	allocator_context
	A user-defined value that is passed to the allocator callbacks.
size_t	max_output_buffers
	Defines the maximum number of buffers that are stored in the sink's output queue.

Detailed Description

Configures the behavior of a queue sink.

A pointer to a IC4_QUEUESINK_CONFIG is passed to ic4_queuesink_create().

Field Documentation

allocator

struct IC4_ALLOCATOR_CALLBACKS allocator

A structure containing function pointers to customize the sink's allocator.

This parameter is optional, set all callback functions to NULL to use the default allocator.

If IC4_ALLOCATOR_CALLBACKS::allocate_buffer is set, IC4_ALLOCATOR_CALLBACKS::free_buffer must be set as well.

allocator_context

void* allocator_context

A user-defined value that is passed to the allocator callbacks.

If callback_context points to a memory location, and callback functions access that memory, the program has to make sure that the memory is valid until the IC4_ALLOCATOR_CALLBACKS::release callback is executed.

callback_context

void* callback_context

A user-defined value that is passed to the callbacks.

If callback_context points to a memory location, and callback functions access that memory, the program has to make sure that the memory is valid until the IC4_QUEUESINK_CALLBACKS::release callback is executed.

callbacks

struct IC4_QUEUESINK_CALLBACKS callbacks

A structure containing function pointers to customize the sink's behavior.

Programs usually at least register a callback for IC4_QUEUESINK_CALLBACKS::frames_queued to be able to process new images immediately.

max_output_buffers

size_t max_output_buffers

Defines the maximum number of buffers that are stored in the sink's output queue.

If set to 0, the number of buffers is unlimited. If a new frame arrives at the sink, and the output queue size would exceed max_output_buffers, the oldest image is discarded and its buffer is added to the free queue.

num_pixel_formats

size_t num_pixel_formats

Length of the pixel_formats array.

If this value is 0, the sink will accept any pixel format.