GstVideoCaptionType

The various known types of Closed Caption (CC).

Values

ValueMeaning
Unknown0

Unknown type of CC

Cea608Raw1

CEA-608 as byte pairs. Note that this format is not recommended since is does not specify to which field the caption comes from and therefore assumes it comes from the first field (and that there is no information on the second field). Use @GST_VIDEO_CAPTION_TYPE_CEA708_RAW if you wish to store CEA-608 from two fields and prefix each byte pair with 0xFC for the first field and 0xFD for the second field.

Cea608S3341a2

CEA-608 as byte triplets as defined in SMPTE S334-1 Annex A. The second and third byte of the byte triplet is the raw CEA608 data, the first byte is a bitfield: The top/7th bit is 0 for the second field, 1 for the first field, bit 6 and 5 are 0 and bits 4 to 0 are a 5 bit unsigned integer that represents the line offset relative to the base-line of the original image format (line 9 for 525-line field 1, line 272 for 525-line field 2, line 5 for 625-line field 1 and line 318 for 625-line field 2).

Cea708Raw3

CEA-708 as cc_data byte triplets. They can also contain 608-in-708 and the first byte of each triplet has to be inspected for detecting the type.

Cea708Cdp4

CEA-708 (and optionally CEA-608) in a CDP (Caption Distribution Packet) defined by SMPTE S-334-2. Contains the whole CDP (starting with 0x9669).