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R. Bernstein
2012-03-05 05:51:31 -05:00
parent 09917474d5
commit 76a3d8016a
1 changed files with 14 additions and 12 deletions
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24
doc/cd-text-format.texi
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@@ -113,9 +113,9 @@ each track if they are present for the whole disc.
The total size of a block's attribute set is restricted by the fact
that it has to be stored in at most 253 records with 12 bytes of
payload. These records are called @emph{Text Packs} described in the
next section. A shortcut for repeated identical track texts is
provided, so that a text that is identical to the one of the previous
track occupies only 2 or 4 bytes.
next section. Since information such as the Disc and Genre
Identification is often the same across mutiple tracks, a compact way
to repeat identical information is provided.
@node Pack Contents
@section Pack Contents
@@ -141,11 +141,12 @@ The first byte of each pack contains the pack type. See
The second byte often gives the track number of the pack. However, a
zero track value indicates that the information pertains to the whole
album. Higher numbers are valid for types @kbd{0x80} to @kbd{0x85},
and @kbd{0x8e}. In these pack types, there should be one text pack for
the disc and one for each track. With types @kbd{0x88} and
@kbd{0x89}, the second byte is a track number too. With type
@kbd{0x8f}, the second byte counts the record parts from 0 to 2.
album. Higher numbers are valid for track-oriented packs (types
@kbd{0x80} to @kbd{0x85}, and @kbd{0x8e}). In these pack types, there
should be one text pack for the disc and one for each track. With TOC
packs (types @kbd{0x88} and @kbd{0x89}), the second byte is a track
number too. With type @kbd{0x8f}, the second byte counts the record
parts from 0 to 2.
The third byte is a sequential counter.
@@ -186,9 +187,10 @@ at most 2048 text packs possible.
If a text of a track (pack types @kbd{0x80} to @kbd{0x85} and
@kbd{0x8e}) repeats identically for the next track, then it may be
represented by a TAB character (ASCII 9) for single byte texts,
resp. two TAB characters for double byte texts. (This should be used
because 256 * 12 bytes is few space for 99 tracks.)
represented by a TAB character (ASCII 9) for single byte texts, and
two TAB characters for double byte texts. This is desirable because
there is a somewhat limited amount of space for CD Text --- 256 * 12
bytes which may have to accomodate up to 99 tracks.
The two binary bytes of pack type @kbd{0x87} are written to the first
@kbd{0x87} pack of a block. They may or may not be repeated at the start