libdc1394: dc1394/utils.h File Reference

libdc1394 2.2.7

Functions
utils.h File Reference

Utility functions. More...

## Functions
dc1394error_t | dc1394_get_image_size_from_video_mode (dc1394camera_t *camera, dc1394video_mode_t video_mode, uint32_t *width, uint32_t *height)
dc1394error_t | dc1394_framerate_as_float (dc1394framerate_t framerate_enum, float *framerate)
dc1394error_t | dc1394_get_color_coding_data_depth (dc1394color_coding_t color_coding, uint32_t *bits)
dc1394error_t | dc1394_get_color_coding_bit_size (dc1394color_coding_t color_coding, uint32_t *bits)
dc1394error_t | dc1394_get_color_coding_from_video_mode (dc1394camera_t *camera, dc1394video_mode_t video_mode, dc1394color_coding_t *color_coding)
dc1394error_t | dc1394_is_color (dc1394color_coding_t color_mode, dc1394bool_t *is_color)
dc1394bool_t | dc1394_is_video_mode_scalable (dc1394video_mode_t video_mode)
dc1394bool_t | dc1394_is_video_mode_still_image (dc1394video_mode_t video_mode)
dc1394bool_t | dc1394_is_same_camera (dc1394camera_id_t id1, dc1394camera_id_t id2)
const char * | dc1394_feature_get_string (dc1394feature_t feature)
const char * | dc1394_error_get_string (dc1394error_t error)
uint16_t | dc1394_checksum_crc16 (const uint8_t *buffer, uint32_t buffer_size)

## Detailed Description

Utility functions.

Author
  Damien Douxchamps: coding
  Peter Antoniac: documentation maintainer

More details soon

## Function Documentation

## ◆ dc1394_checksum_crc16()

uint16_t dc1394_checksum_crc16 | ( | const uint8_t * | buffer,
|  | uint32_t | buffer_size )

Calculates the CRC16 checksum of a memory region. Useful to verify the CRC of an image buffer, for instance.

## ◆ dc1394_error_get_string()

const char * dc1394_error_get_string | ( | dc1394error_t | error | ) |

Returns a descriptive string for an error code

## ◆ dc1394_feature_get_string()

const char * dc1394_feature_get_string | ( | dc1394feature_t | feature | ) |

Returns a descriptive name for a feature

## ◆ dc1394_framerate_as_float()

dc1394error_t dc1394_framerate_as_float | ( | dc1394framerate_t | framerate_enum,
|  | float * | framerate )

Returns the given framerate as a float.

## ◆ dc1394_get_color_coding_bit_size()

dc1394error_t dc1394_get_color_coding_bit_size | ( | dc1394color_coding_t | color_coding,
|  | uint32_t * | bits )

Returns the bit-space used by a pixel. This is different from the data depth! For instance, RGB16 has a bit space of 48 bits, YUV422 is 16bits and YU411 is 12bits.

## ◆ dc1394_get_color_coding_data_depth()

dc1394error_t dc1394_get_color_coding_data_depth | ( | dc1394color_coding_t | color_coding,
|  | uint32_t * | bits )

Returns the number of bits per pixel for a certain color coding. This is the size of the data sent on the bus, the effective data depth may vary. Example: RGB16 is 16, YUV411 is 8, YUV422 is 8.

## ◆ dc1394_get_color_coding_from_video_mode()

dc1394error_t dc1394_get_color_coding_from_video_mode | ( | dc1394camera_t * | camera,
|  | dc1394video_mode_t | video_mode,
|  | dc1394color_coding_t * | color_coding )

Returns the color coding from the video mode. Works with scalable image formats too.

## ◆ dc1394_get_image_size_from_video_mode()

dc1394error_t dc1394_get_image_size_from_video_mode | ( | dc1394camera_t * | camera,
|  | dc1394video_mode_t | video_mode,
|  | uint32_t * | width,
|  | uint32_t * | height )

Returns the image width and height (in pixels) corresponding to a video mode. Works for scalable and non-scalable video modes.

## ◆ dc1394_is_color()

dc1394error_t dc1394_is_color | ( | dc1394color_coding_t | color_mode,
|  | dc1394bool_t * | is_color )

Tells whether the color mode is color or monochrome

## ◆ dc1394_is_same_camera()

dc1394bool_t dc1394_is_same_camera | ( | dc1394camera_id_t | id1,
|  | dc1394camera_id_t | id2 )

Tells whether two IDs refer to the same physical camera unit.

## ◆ dc1394_is_video_mode_scalable()

dc1394bool_t dc1394_is_video_mode_scalable | ( | dc1394video_mode_t | video_mode | ) |

Tells whether the video mode is scalable or not.

## ◆ dc1394_is_video_mode_still_image()

dc1394bool_t dc1394_is_video_mode_still_image | ( | dc1394video_mode_t | video_mode | ) |

Tells whether the video mode is "still image" or not ("still image" is currently not supported by any cameras on the market)