Associated data list chunk (of a Wave file)

An associated data list in the wave file format is a LIST chunk of type "adtl". It defines text labels and names for cue points. An associated data list typically uses label sub-chunks, note sub-chunks, and labeled text sub-chunks.

An associated data list chunk has the following format.

Byte sequence description Length in bytes Starts with byte in the chunk Value
chunk ID 4 0x00 The ASCII character string "LIST"
size 4 0x04 The size of the sub-chunk less 8 (less the "chunk ID" and the "size") (an unsigned integer)
list type ID 4 0x08 The ASCII character string "adtl"
data various 0x0C The label, note, and text sub-chunks described below

Label and note sub-chunks

A label sub-chunk and a note sub-chunk have the same structure.

Byte sequence description Length in bytes Starts with byte in the sub-chunk Value
sub-chunk ID 4 0x00 The ASCII character string "labl" or "note"
size 4 0x04 The size of the chunk less 8 (less the "sub-chunk ID" and the "size")
cue point ID 4 0x08 The ID of the relevant cue point (see Cue chunk (of a Wave file))
data various 0x0C Some ASCII text

The ASCII text is null terminated and must be padded, if not word aligned.

Labeled text sub-chunk

The labeled text sub-chunk associates some portion of the audio data with text and serves as a marker. This sub-chunk has the following format.

Byte sequence description Length in bytes Starts at byte in the sub-chunk Value
sub-chunk ID 4 0x00 The ASCII character string "ltxt"
size 4 0x04 The size of the sub-chunk less 8 (less the "sub-chunk ID" and the "size")
cue point ID 4 0x08 The ID of the relevant cue point
sample length 4 0x0C The number of samples in the segment of audio data described by this chunk
purpose ID 4 0x10 The purpose of the text. Common IDs are "scrp" for script and "capt" for closed captioning
country 2 0x14 The country of the text
language 2 0x16 The language of the text
dialect 2 0x18 The dialect of the text
code page 2 0x1A The code page for the text
data various 0x1C Some ASCII text

The labeled text sub-chunk is always a part of an associated data list chunk.

See also:
Wave file format, List chunk (of a RIFF file)

Comments

admin: First posted on 2015 02 08

anonymous, 2015 02 08: The "labl" or "note" tables (above) seem to replicate but the first row "Byte sequence description" is sub-chunk ID vs chunk-ID... My assumption is that the tables are documenting the same sub-chunk - and as a result the use of "chunk-ID" in the second table is incorrect --- If my assumption is correct I would remove the redundant table because it suggests that there are two chunk/sub-chunks that have the same "Byte sequence description"

Richard Lee, 2015 05 10: As per the above comment - the second listl/note table is incorrect - the ChunkId should read "ltxt” (labelled text) not "note"/"labl".

mic, 2016 08 11: This is correct. It should be "ltxt". It is now fixed.

Add new comment

Filtered HTML

  • Freelinking helps you easily create HTML links. Links take the form of [[indicator:target|Title]]. By default (no indicator): Click to view a local node.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Image CAPTCHA
Enter the characters shown in the image.