Class: shaka.cea.DummyCaptionDecoder

Constructor

new DummyCaptionDecoder()

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Methods

clear()

Clears the decoder state completely. Should be used when an action renders the decoder state invalid, e.g. unbuffered seeks.
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decode() → {Array<!shaka.extern.ICaptionDecoder.ClosedCaption>}

Decodes all currently extracted packets and then clears them. This should be called once for a set of extracts (see comment on extract).
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Type
Array<!shaka.extern.ICaptionDecoder.ClosedCaption>

extract(userDataSeiMessagenon-null, pts)

Extracts packets and prepares them for decoding. In a given media fragment, all the caption packets found in its SEI messages should be extracted by successive calls to extract(), followed by a single call to decode().
Parameters:
Name Type Description
userDataSeiMessage Uint8Array This is a User Data registered by Rec.ITU-T T.35 SEI message. It is described in sections D.1.6 and D.2.6 of Rec. ITU-T H.264 (06/2019).
pts number PTS when this packet was received, in seconds.
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extractRaw608(raw608Datanon-null, pts)

Extracts raw CEA-608 caption bytes from a dedicated MP4 'c608' track and prepares them for decoding. In a given media fragment, all the CEA-608 samples found in the track should be extracted by successive calls to extractRaw608(), followed by a single call to decode(). Unlike extract(), this method does not process SEI messages or ITU-T T.35 user data. The input is raw CEA-608 byte pairs as stored directly in the MP4 sample payload of a 'c608' track (Apple-style fragmented MP4). Each call provides the full sample payload for a single caption sample. The payload typically consists of one or more CEA-608 cc_data byte pairs.
Parameters:
Name Type Description
raw608Data Uint8Array Raw CEA-608 data bytes from a 'c608' MP4 track sample.
pts number PTS when this sample was received, in seconds.
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getStreams() → {Array<string>}

Returns the streams that the CEA decoder found.
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Type
Array<string>