gsttagexif

gsttagexif — tag mappings and support functions for plugins dealing with exif tags

Functions

Object Hierarchy


Includes

#include <gst/tag/tag.h>

Description

Contains utility function to parse GstTagLists from exif buffers and to create exif buffers from GstTagLists

Note that next IFD fields on the created exif buffers are set to 0.

Functions

gst_tag_list_to_exif_buffer ()

GstBuffer *
gst_tag_list_to_exif_buffer (const GstTagList *taglist,
                             gint byte_order,
                             guint32 base_offset);

Formats the tags in taglist on exif format. The resulting buffer contains the tags IFD and is followed by the data pointed by the tag entries.

Parameters

taglist

The taglist

 

byte_order

byte order used in writing (G_LITTLE_ENDIAN or G_BIG_ENDIAN)

 

base_offset

Offset from the tiff header first byte

 

Returns

A GstBuffer containing the tag entries followed by the tag data


gst_tag_list_to_exif_buffer_with_tiff_header ()

GstBuffer *
gst_tag_list_to_exif_buffer_with_tiff_header
                               (const GstTagList *taglist);

Formats the tags in taglist into exif structure, a tiff header is put in the beginning of the buffer.

Parameters

taglist

The taglist

 

Returns

A GstBuffer containing the data


gst_tag_list_from_exif_buffer ()

GstTagList *
gst_tag_list_from_exif_buffer (GstBuffer *buffer,
                               gint byte_order,
                               guint32 base_offset);

Parses the IFD and IFD tags data contained in the buffer and puts it on a taglist. The base_offset is used to subtract from the offset in the tag entries and be able to get the offset relative to the buffer start

Parameters

buffer

The exif buffer

 

byte_order

byte order of the data

 

base_offset

Offset from the tiff header to this buffer

 

Returns

The parsed taglist


gst_tag_list_from_exif_buffer_with_tiff_header ()

GstTagList *
gst_tag_list_from_exif_buffer_with_tiff_header
                               (GstBuffer *buffer);

Parses the exif tags starting with a tiff header structure.

Parameters

buffer

The exif buffer

 

Returns

The taglist

Types and Values

See Also

GstTagList