| Unicap Reference Manual | ||||
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| Top | Description | ||||
enum unicap_buffer_type_t; unicap_device_t; unicap_rect_t; unicap_format_t; unicap_data_buffer_t; enum unicap_property_flags_t; unicap_property_range_t; unicap_property_value_list_t; unicap_property_menu_t; enum unicap_property_type_enum_t; unicap_property_t; enum unicap_event_t; #define UNICAP_FLAGS_MANUAL #define UNICAP_FLAGS_AUTO #define UNICAP_FLAGS_ONE_PUSH #define UNICAP_FLAGS_READ_OUT #define UNICAP_FLAGS_ON_OFF #define UNICAP_FLAGS_READ_ONLY #define UNICAP_FLAGS_FORMAT_CHANGE void (*unicap_callback_t) (unicap_event_t event,...); void (*unicap_new_frame_callback_t) (unicap_event_t event,unicap_handle_t handle,unicap_data_buffer_t *buffer,void *user_ptr); void (*unicap_drop_frame_callback_t) (unicap_event_t event,unicap_handle_t handle,void *user_ptr); void (*unicap_new_device_callback_t) (unicap_event_t event,unicap_device_t *device,void *user_ptr); unicap_status_t unicap_check_version (unsigned int major,unsigned int minor,unsigned int micro); unicap_status_t unicap_reenumerate_devices (int *count); unicap_status_t unicap_enumerate_devices (unicap_device_t *specifier,unicap_device_t *device,int index); unicap_status_t unicap_open (unicap_handle_t *handle,unicap_device_t *device); unicap_status_t unicap_register_callback (unicap_handle_t handle,unicap_event_t event,unicap_callback_t callback,void *user_ptr); unicap_status_t unicap_close (unicap_handle_t handle); unicap_status_t unicap_get_device (unicap_handle_t handle,unicap_device_t *device); unicap_handle_t unicap_clone_handle (unicap_handle_t handle); unicap_status_t unicap_reenumerate_formats (unicap_handle_t handle,int *count); unicap_status_t unicap_enumerate_formats (unicap_handle_t handle,unicap_format_t *specifier,unicap_format_t *format,int index); unicap_status_t unicap_set_format (unicap_handle_t handle,unicap_format_t *format); unicap_status_t unicap_get_format (unicap_handle_t handle,unicap_format_t *format); unicap_status_t unicap_reenumerate_properties (unicap_handle_t handle,int *count); unicap_status_t unicap_enumerate_properties (unicap_handle_t handle,unicap_property_t *specifier,unicap_property_t *property,int index); unicap_status_t unicap_set_property (unicap_handle_t handle,unicap_property_t *property); unicap_status_t unicap_set_property_value (unicap_handle_t handle,char *identifier,double value); unicap_status_t unicap_set_property_manual (unicap_handle_t handle,char *identifier); unicap_status_t unicap_set_property_auto (unicap_handle_t handle,char *identifier); unicap_status_t unicap_set_property_one_push (unicap_handle_t handle,char *identifier); unicap_status_t unicap_get_property (unicap_handle_t handle,unicap_property_t *property); unicap_status_t unicap_get_property_value (unicap_handle_t handle,const char *identifier,double *value); unicap_status_t unicap_get_property_menu (unicap_handle_t handle,const char *identifier,char **value); unicap_status_t unicap_get_property_auto (unicap_handle_t handle,const char *identifier,int *enabled); unicap_status_t unicap_start_capture (unicap_handle_t handle); unicap_status_t unicap_stop_capture (unicap_handle_t handle); unicap_status_t unicap_queue_buffer (unicap_handle_t handle,unicap_data_buffer_t *data_buffer); unicap_status_t unicap_dequeue_buffer (unicap_handle_t handle,unicap_data_buffer_t **data_buffer); unicap_status_t unicap_wait_buffer (unicap_handle_t handle,unicap_data_buffer_t **data_buffer); unicap_status_t unicap_poll_buffer (unicap_handle_t handle,int *count);
typedef enum
{
UNICAP_BUFFER_TYPE_USER = 0,
UNICAP_BUFFER_TYPE_SYSTEM,
} unicap_buffer_type_t;
typedef struct {
char identifier[128];
char model_name[128];
char vendor_name[128];
unsigned long long model_id;
unsigned int vendor_id;
char cpi_layer[1024];
char device[1024];
unsigned int flags;
} unicap_device_t;
A struct defining a device
| unique textual ID of a device | |
| model name of the device | |
| name of the device vendor | |
| numerical ID of the vendor ( eg. USB Vendor ID ) | |
| name of the plugin used to communicate with the device | |
| name of the device file, if any | |
| flags |
typedef struct {
int x;
int y;
int width;
int height;
} unicap_rect_t;
A struct defining a rectangle
typedef struct {
char identifier[128];
unicap_rect_t size;
unicap_rect_t min_size;
unicap_rect_t max_size;
int h_stepping;
int v_stepping;
unicap_rect_t *sizes;
int size_count;
int bpp;
unsigned int fourcc;
unicap_format_flags_t flags;
unsigned int buffer_types;
int system_buffer_count;
size_t buffer_size;
unicap_buffer_type_t buffer_type;
} unicap_format_t;
| unique textual identifier of this format | |
unicap_rect_t |
size of the format |
unicap_rect_t |
minimum size |
unicap_rect_t |
maximum size |
| horizontal stepping | |
| vertical stepping | |
unicap_rect_t * |
array of allowed sizes. Might be NULL |
| number of element in the sizes array | |
| bits per pixel | |
| FOURCC describing the colour format | |
| amount of memory required by one data buffer of this format | |
unicap_buffer_type_t |
typedef struct {
unicap_format_t format;
int frame_number;
struct timeval fill_time;
struct timeval duration;
struct timeval capture_start_time;
unsigned char *data;
size_t buffer_size;
unicap_buffer_type_t type;
unicap_buffer_flags_t flags;
unicap_data_buffer_private_t *private;
} unicap_data_buffer_t;
unicap_format_t |
a unicap_format_t describing the layout of the data buffer |
| the time when capturing completed on this buffer | |
| frame duration of this buffer ( might not be present on all devices ) | |
| the time when the capturing started on this buffer ( might not be supported on all devices ) | |
| the image data | |
| size of the memory buffer pointed to by data | |
unicap_buffer_type_t |
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typedef enum
{
UNICAP_FLAGS_MANUAL = 1ULL,
UNICAP_FLAGS_AUTO = (1ULL<<1ULL),
UNICAP_FLAGS_ONE_PUSH = (1ULL<<2ULL),
UNICAP_FLAGS_READ_OUT = (1ULL<<3ULL),
UNICAP_FLAGS_ON_OFF = (1ULL<<4ULL),
UNICAP_FLAGS_READ_ONLY = (1ULL<<5ULL),
UNICAP_FLAGS_FORMAT_CHANGE = (1ULL<<6ULL),
UNICAP_FLAGS_WRITE_ONLY = (1ULL<<7ULL),
UNICAP_FLAGS_CHECK_STEPPING = (1ULL<<32ULL),
UNICAP_FLAGS_DUMMY_VALUE = (0xffffffffffffffffULL)
} unicap_property_flags_t;
typedef struct {
double *values;
int value_count;
} unicap_property_value_list_t;
typedef struct {
char **menu_items;
int menu_item_count;
} unicap_property_menu_t;
typedef enum
{
UNICAP_PROPERTY_TYPE_RANGE = 0,
UNICAP_PROPERTY_TYPE_VALUE_LIST,
UNICAP_PROPERTY_TYPE_MENU,
UNICAP_PROPERTY_TYPE_DATA,
UNICAP_PROPERTY_TYPE_FLAGS,
UNICAP_PROPERTY_TYPE_UNKNOWN
} unicap_property_type_enum_t;
typedef struct {
char identifier[128];
char category[128];
char unit[128];
char **relations;
int relations_count;
union
double value;
char menu_item[128];
union
unicap_property_range_t range;
unicap_property_value_list_t value_list;
unicap_property_menu_t menu;
double stepping;
unicap_property_type_enum_t type;
unicap_property_flags_t flags;
unicap_property_flags_t flags_mask;
void *property_data;
size_t property_data_size;
} unicap_property_t;
| unique textual identifier of this properties | |
| a category for this property, for example: 'Lens Control' for zoom and focus properties | |
| optional unit, for example: 's' for Exposure denoting the Exposure time in seconds | |
| properties that might their state or value when changing this property | |
| size of the relations array | |
| for UNICAP_PROPERTY_TYPE_MENU properties: selected menu entry | |
unicap_property_value_list_t |
for UNICAP_PROPERTY_TYPE_VALUE_LIST properties: list of valid values |
unicap_property_menu_t |
for UNICAP_PROPERTY_TYPE_MENU properties: menu |
| for UNICAP_PROPERTY_TYPE_RANGE properties: stepping | |
| the type of the property | |
unicap_property_flags_t |
when enumerated, this field contains the default flags for the property; for get/set operations, this field contains the actual flags |
unicap_property_flags_t |
when enumerated, this field contains the allowed flags for the property; for get/set operations, this field acts as a mask |
| a pointer to an opaque data structure | |
| size of the data structure pointed at by property_data |
typedef enum
{
UNICAP_EVENT_FIRST = 0,
UNICAP_EVENT_DEVICE_REMOVED = 0,
UNICAP_EVENT_NEW_DEVICE,
UNICAP_EVENT_NEW_FRAME,
UNICAP_EVENT_DROP_FRAME,
UNICAP_EVENT_LAST
} unicap_event_t;
void (*unicap_new_frame_callback_t) (unicap_event_t event,unicap_handle_t handle,unicap_data_buffer_t *buffer,void *user_ptr);
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void (*unicap_drop_frame_callback_t) (unicap_event_t event,unicap_handle_t handle,void *user_ptr);
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void (*unicap_new_device_callback_t) (unicap_event_t event,unicap_device_t *device,void *user_ptr);
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unicap_status_t unicap_check_version (unsigned int major,unsigned int minor,unsigned int micro);
Checks that the unicap library version is compatible with given version
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major version to check against |
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minor version to check against |
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micro version to check against |
Returns : |
TRUE if compatible |
unicap_status_t unicap_reenumerate_devices (int *count);
Rebuild internal list of devices.
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if not NULL, receives number of devices found |
Returns : |
status |
unicap_status_t unicap_enumerate_devices (unicap_device_t *specifier,unicap_device_t *device,int index);
Enumerates currently connected video capture devices
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specifies which devices should be returned, or NULL |
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receives the device |
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number of the device to be enumerated |
Returns : |
status |
unicap_status_t unicap_open (unicap_handle_t *handle,unicap_device_t *device);
Acquire a handle to a device.
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receives the new handle |
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device to open, as returned by unicap_enumerate_devices |
Returns : |
status |
unicap_status_t unicap_register_callback (unicap_handle_t handle,unicap_event_t event,unicap_callback_t callback,void *user_ptr);
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a handle |
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event to register a callback for |
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the callback function to call when the event occurs |
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user provided data that gets passed to the callback function |
Returns : |
unicap_status_t unicap_close (unicap_handle_t handle);
Clsoing a handle decrements the reference count on the device. If the reference count is 0, all resources associated with the device get freed.
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a handle |
Returns : |
status |
unicap_status_t unicap_get_device (unicap_handle_t handle,unicap_device_t *device);
Gets the device controled by handle
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a handle |
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a pointer to the location where the device should be stored |
Returns : |
status |
unicap_handle_t unicap_clone_handle (unicap_handle_t handle);
Copies the handle, increment the reference count
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the handle to clone |
Returns : |
new handle |
unicap_status_t unicap_reenumerate_formats (unicap_handle_t handle,int *count);
Re-create the list of formats supported by the device. Invalidates all data returned by prior calls
to unicap_emumerate_formats() and unicap_get_format().
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A handle |
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Receives the number of formats currently supported by the device. Might be NULL |
Returns : |
status |
unicap_status_t unicap_enumerate_formats (unicap_handle_t handle,unicap_format_t *specifier,unicap_format_t *format,int index);
Enumerate formats known to the device
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A handle |
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limits the enumerated formats to the ones matching the fields in specifier. Fields set to -1 in the specifier are ignored |
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A pointer to allocated storage where the enumerated format shoudl be stored |
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index of the format in the enumeration |
Returns : |
STATUS_NO_MORE_FORMATS: end of the list of matching formats has been reached |
unicap_status_t unicap_set_format (unicap_handle_t handle,unicap_format_t *format);
Set a format.
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a handle |
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the format to set |
Returns : |
STATUS_NO_MATCH: given format not valid for device |
unicap_status_t unicap_get_format (unicap_handle_t handle,unicap_format_t *format);
Get the current format
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a handle |
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a pointer to the location where the returned format should be stored |
Returns : |
status |
unicap_status_t unicap_reenumerate_properties (unicap_handle_t handle,int *count);
Re-create the list of properties supported by the device. This invalidates all data returned by prior calls to
unicap_enumerate_properties() and unicap_get_property()
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a handle |
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receives number of properties supported by the device. Might be NULL |
Returns : |
status |
unicap_status_t unicap_enumerate_properties (unicap_handle_t handle,unicap_property_t *specifier,unicap_property_t *property,int index);
Enumerate properties matching "specifier"
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a handle |
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specifier |
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a pointer to the location where the enumerated property should be stored |
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index of the property |
Returns : |
status |
unicap_status_t unicap_set_property (unicap_handle_t handle,unicap_property_t *property);
Set a device property
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a handle |
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the property to set |
Returns : |
status |
unicap_status_t unicap_set_property_value (unicap_handle_t handle,char *identifier,double value);
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Returns : |
unicap_status_t unicap_set_property_manual (unicap_handle_t handle,char *identifier);
Sets a property to manual mode, disabling the automatic mode
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A handle |
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identifier of the property to set |
Returns : |
status |
unicap_status_t unicap_set_property_auto (unicap_handle_t handle,char *identifier);
Sets the property to automatic mode
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A handle |
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identifier of the property to set |
Returns : |
status |
unicap_status_t unicap_set_property_one_push (unicap_handle_t handle,char *identifier);
Enable one push mode on a property
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a handle |
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identifier of the property to set |
Returns : |
status |
unicap_status_t unicap_get_property (unicap_handle_t handle,unicap_property_t *property);
Get a device property
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a handle |
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a pointer to the location where the returned property should be stored |
Returns : |
status |
unicap_status_t unicap_get_property_value (unicap_handle_t handle,const char *identifier,double *value);
Returns the value of a property
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a handle |
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identifier of the property to query |
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a pointer to the location where the value should be stored |
Returns : |
status |
unicap_status_t unicap_get_property_menu (unicap_handle_t handle,const char *identifier,char **value);
Returns the menu string of a property. Property must be of UNICAP_PROPERTY_TYPE_MENU type. The returned string is owned by the unicap library and might be overwritten by subsequent calls to unicap_get_property_menu.
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A handle |
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identifier of the property to query |
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pointer to store the string location |
Returns : |
status |
unicap_status_t unicap_get_property_auto (unicap_handle_t handle,const char *identifier,int *enabled);
Retrieve the current property auto mode
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a handle |
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identifier of the property to query |
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location to store the enabled flag |
Returns : |
status |
unicap_status_t unicap_start_capture (unicap_handle_t handle);
Start the capture device. After this call, unicap_wait_buffer calls are allowed
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a handle |
Returns : |
status |
unicap_status_t unicap_stop_capture (unicap_handle_t handle);
Stop the capture device
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A handle |
Returns : |
status |
unicap_status_t unicap_queue_buffer (unicap_handle_t handle,unicap_data_buffer_t *data_buffer);
Queue a buffer to be filled by the capture device. The queued buffer must not be touched ( especially not be freed ) until it is in the ready queue or dequeued. Supplied buffer must be at least of the buffer size returned by get_format
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A handle |
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A pointer to the buffer to queue |
Returns : |
status |
unicap_status_t unicap_dequeue_buffer (unicap_handle_t handle,unicap_data_buffer_t **data_buffer);
Removes the first buffer from the queue. Depending on the device:Can only be called if the capture device is stopped.
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A handle |
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receives the dequeued buffer or NULL if no buffer was queued |
Returns : |
status |
unicap_status_t unicap_wait_buffer (unicap_handle_t handle,unicap_data_buffer_t **data_buffer);
Removes a buffer from the ready queue. If no buffer is available, this function blocks until a buffer got filled.
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A handle |
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A pointer to the location where the returned buffer should be stored |
Returns : |
status |