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JxlFrameHeader Struct Reference
JPEG XL library (libjxl) » Image and frame metadata

`#include <codestream_header.h>`

Collaboration diagram for JxlFrameHeader:
[legend]

## Public Attributes

uint32_t | duration
uint32_t | timecode
uint32_t | name_length
JXL_BOOL | is_last
JxlLayerInfo | layer_info

## Detailed Description

The header of one displayed frame or non-coalesced layer.

## Member Data Documentation

## duration

uint32_t JxlFrameHeader::duration

How long to wait after rendering in ticks. The duration in seconds of a tick is given by tps_numerator and tps_denominator in JxlAnimationHeader.

## is_last

JXL_BOOL JxlFrameHeader::is_last

Indicates this is the last animation frame. This value is set by the decoder to indicate no further frames follow. For the encoder, it is not required to set this value and it is ignored, JxlEncoderCloseFrames is used to indicate the last frame to the encoder instead.

## layer_info

JxlLayerInfo JxlFrameHeader::layer_info

Information about the layer in case of no coalescing.

## name_length

uint32_t JxlFrameHeader::name_length

Length of the frame name in bytes, or 0 if no name. Excludes null termination character. This value is set by the decoder. For the encoder, this value is ignored and JxlEncoderSetFrameName is used instead to set the name and the length.

## timecode

uint32_t JxlFrameHeader::timecode

SMPTE timecode of the current frame in form 0xHHMMSSFF, or 0. The bits are interpreted from most-significant to least-significant as hour, minute, second, and frame. If timecode is nonzero, it is strictly larger than that of a previous frame with nonzero duration. These values are only available if have_timecodes in JxlAnimationHeader is JXL_TRUE. This value is only used if have_timecodes in JxlAnimationHeader is JXL_TRUE.

The documentation for this struct was generated from the following file:

- jxl/codestream_header.h