File
File
Standard Density CD
Red Book
FILE SYSTEM
Directory Structure
File directory is based on ISO 9660 and the micro Universal Disk Format Specification (M-UDF).
The latest UDF specification (November 3, 1995) can be obtained from:
Optical Storage Technology Association
311 East Carrillo Street
Santa Barbara, CA 93101
USA
Voice: +1 805 963 3853
Fax: +1 805 962 1541
E-mail: osta@aol.com
Example file structure:
Root ---------------------------------------------------
| | |
Video_TS (directory) Audio_TS Provider defined
|
|
|
| - Video_TS.INF (Video Manager Information)
| - Video_TS.VOB (Video Manager Menu)
| - Video_TS.BUP (Video Manager Information)
|
| - TITLE_A.INF (Video Title Set Information)
| - TITLE_A0.INF (Video Title Set Menu)
| - TITLE_A1.VOB (Video Title Set Title)
| - TITLE_A2.VOB (Video Title Set Title)
| - TITLE_A.BUP (Video Title Set Information)
Restrictions:
Layout of Volume:
Lead-in Data Recorded Area Lead Out
IIIIIII DDDDDDDDDDDDDDDDDD OOOOOOOO
ISO9660&M-UDF
File 0
File 1
Disc Type and Capacity
| Single layer Single sided (SL/SS) |
Dual layer Single sided (DL/SS) |
Single layer Double sided (SL/DS) |
Dual Layer Double sided (DL/DS) |
|
| 12 cm diameter disc | 4.7 GB | 8.5 GB | 9.4 GB | 17 GB |
| 8 cm diameter disc | 1.4 GB | 2.6 GB | 2.9 GB | 5.3 GB |
Recordable time on a disc scenarios:
| | |||||||
|---|---|---|---|---|---|---|---|
| Application | Stream type | Total stream(s) rate (mbit/sec) | Avg rate (mbit/sec) | SL/SS | DL/SS | SL/DS | DL/DS |
| Movie | 4.8 | 130 | 236 | 259 | 472 | ||
| Video | 3.5 | ||||||
| Audio (AC-3, 3 languages) | 1.152 | ||||||
| Sub-picture | |||||||
| Karaoke | 4.0 | 155 | 282 | 310 | 564 | ||
| Video | 3.5 | ||||||
| Audio (AC-3, 1 language) | 0.384 | ||||||
| Sub-picture | |||||||
| Video Clip A | 5.2 | 120 | 218 | 340 | 436 | ||
| Video | 3.5 | ||||||
| Audio (2 ch. PCM) | 1.536 | ||||||
| Sub-picture | |||||||
| Video Clip B | 8.8 | 71 | 129 | 142 | 258 | ||
| Video | 7.0 | ||||||
| Audio (2 ch. PCM) | 1.536 | ||||||
| Sub-picture | |||||||
| Video Clip C | 8.4 | 75 | 136 | 149 | 272 | ||
| Video | 7.0 | ||||||
| Audio (2 ch. PCM) | 1.536 | ||||||
| Sub-picture | |||||||
Red Book
White Book (a derivative of Red Book) is a constant-rate linear format. Therefore the total storage time is fixed. DVD on the other hand is a non-linear medium permitting seamless playback of jumps. It acheives this via a track buffer which maps DVD's constant 11.08 mbit/sec user rate to a variable rate stream.
Red Book frame breakdown of user bits:
Each frame of Red Book audio data consists of 588 channel bits. Only 192 bits are used to store the audio stream
| Field | User bytes | Comments |
|---|---|---|
| subcode | 1 | 8 bits of subcode channel data |
| audio data | 24 | 6 samples * 2 channels * 2 bytes/sample |
| FEC | 8 | RS rate of 3/4 |
| TOTAL | 33 bytes |
frame channel bits:
Convert 33 user bytes into 8/14 code:
1 symbol/byte * 33 bytes * 17 channel bits/symbol = 561 bits Add 24 bits for the sync word + 3 merge bits = 588 bits
Bit rate calculation:
98 frames/sector * 75 sectors/sec * 588 channel bits/frame = 4,321,800 bits/sec
|
|
|
| Channel rate | 4,321,800 bits/sec |
| after channel demod | 1,940,400 |
| subcode rate | 58,800 |
| error correction rate (FEC) | 470,400 |
| user rate after FEC removal | 1,470,000 |
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