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82 lines
2.7 KiB
Plaintext
82 lines
2.7 KiB
Plaintext
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=== The tracks block (`TRKS`)
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The tracks block holds a structured list of track entries, typically aligned with the layout specified in the table of contents or a similar indexing schema.
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This format is common in optical media such as CDs, DVDs, and related disc-based formats.
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==== Structure Definition
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[source,c]
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#define TRACKS_MAGIC 0x534B5254
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/**Contains list of optical disc tracks */
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typedef struct TracksHeader
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{
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/**Identifier, <see cref="BlockType.TracksBlock" /> */
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uint32_t identifier;
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/**How many entries follow this header */
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uint16_t entries;
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/**CRC64-ECMA of the block */
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uint64_t crc64;
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} TracksHeader;
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==== Field Descriptions
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[cols="2,2,2,6",options="header"]
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|===
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|Type|Size|Name|Description
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|uint32_t|4 bytes|identifier|The tracks block identifier, always `TRKS`
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|uint16_t|2 bytes|entries|The number of entries following this header
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|uint64_t|8 bytes|crc64|CRC64-ECMA checksum of the entries following this header
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|===
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==== Track entries
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[source,c]
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/**Optical disc track */
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typedef struct TrackEntry
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{
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/**Track sequence */
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uint8_t sequence;
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/**Track type */
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uint8_t type;
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/**Track starting LBA */
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int64_t start;
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/**Track last LBA */
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int64_t end;
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/**Track pregap in sectors */
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int64_t pregap;
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/**Track session */
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uint8_t session;
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/**Track's ISRC in ASCII */
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uint8_t isrc[13];
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/**Track flags */
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uint8_t flags;
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} TrackEntry;
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==== Field Descriptions
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[cols="2,2,2,6",options="header"]
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|===
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|Type|Size|Name|Description
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|uint8|1 byte|sequence|Track number.
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|uint8|1 byte|type|Track type (see table below).
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|int64|8 bytes|start|Track starting LBA (including pregap).
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|int64|8 bytes|end|Track ending LBA.
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|int64|8 bytes|pregap|Size of track’s pregap in sectors.
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|uint8|1 byte|session|Session the track belongs to.
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|StringA|13 bytes|isrc|Track’s ISRC in ASCIIZ.
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|uint8|1 byte|flags|Track flags as indicated in TOC if applicable.
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|===
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==== Track Types
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[cols="2,1,8",options="header"]
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|===
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|Type|Value|Description
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|Audio|0|All sectors in the track contain audio as defined by the Red Book.
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|Data|1|All sectors in the track contain user data that is not defined by any of the following types.
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|CdMode1|2|All sectors in the track contain user data according to MODE 1 as defined by the Yellow Book.
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|CdMode2Formless|3|All sectors in the track contain user data according to MODE 2 as defined by the Yellow and Green Books. Not all sectors belong to the same Form.
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|CdMode2Form1|4|All sectors in the track contain user data according to MODE 2 Form 1 as defined by the Yellow and Green Books. All sectors belong to the same Form.
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|CdMode2Form2|5|All sectors in the track contain user data according to MODE 2 Form 2 as defined by the Yellow and Green Books. All sectors belong to the same Form.
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|===
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