1、 1 Scope This practice specifies a method of coding data into the binary user groups of time and control codes for motion-picture systems. The type of data recorded is useful in the production of motion pictures. This practice also specifies a directory system to accommodate the various types of dat
2、a that may need to be recorded. Whether or not to use a particular type of data (and, if used, the repetition frequency) is left to the discretion of the equipment manufacturer and/or the user. This practice also specifies the use of a checksum in one of the binary user groups. 2 Normative reference
3、 The following standard contains provisions which, through reference in this text, constitute provisions of this practice. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this practice are encouraged to investigat
4、e the possibility of applying the most recent edition of the standard indicated below. SMPTE RP 136-2004, Time and Control Codes for 24, 25 or 30 Frame-Per-Second Motion-Picture Systems 3 Binary group flag bits When the data format corresponding to this practice is used, the binary group flag bits s
5、pecified in SMPTE RP 136 shall be set as follows: Bit 43 of the type C code or bit 67 of the type B code shall be set to a zero. Bit 59 of the type C code or bit 83 of the type B code shall be set to a one. 4 Data structure 4.1 There are 8 binary groups specified in SMPTE RP 136, each consisting of
6、four bits. Unless otherwise specified, when a group of these bits is used to represent a number of characters, the bit with the lowest number specified in SMPTE RP 136 shall be the least significant bit, and the unit with the highest number shall be the most significant bit. 4.2 The first binary gro
7、up shall be used as a data identification index, identifying the data in the second through seventh binary groups as specified below, and as shown in table 1. There are 16 possible index values, numbered 0 through 15. Each frame of time and control code may thus contain only one type of data, depend
8、ing on the value of the data identification index. A sequence or more than one frame may be required, therefore, to record all the required data. However, the choice of which data types to use (and their repetition frequency) is left to the discretion of the user and/or manufacturer. Page 1 of 4 pag
9、es RP 135-2004 Revision of RP 135-1999 Copyright 2004 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 ApprovedNovember 8, 2004SMPTE RECOMMENDED PRACTICE Use of Binary User Groups in Motion-Picture Time and Control Codes RP 135-20
10、04 Page 2 of 4 pages Table 1 Directory Index Data Digits Format 0 Flags 24 Binary 1 Date (DDMMYY) 6 BCD 2 Production number 6 BCD 3 Equipment identification 4 6-BIT CHAR 4 Scene number 4 6-BIT CHAR 5 Take number 4 6-BIT CHAR 6 Roll number 4 6-BIT CHAR 7 14 Unassigned 15 Extended directory 4.3 The ei
11、ghth binary group shall be used as a checksum. It shall contain the negative of the modulo-16 sum of the first through seventh binary groups. 4.4 Directory 4.4.1 Entry 0 When the value of the data identification index is zero, the bits of the second through seventh binary groups shall be used as ind
12、ividual flags as described in table 2. Flag bits that are not used or that are unassigned should be set to zero. Table 2 Flags Data Bit No. type C Bit No. type B Zero One 12 36 Pictures Audio 13 37 Sync sound or picture No sound / no picture 14 38 To be printed Not printed 15 39 Sync speed Not sync
13、speed 20 44 Day photography Night photography 21 45 Daylight Tungsten 4.4.2 Entry 1 When the value of the data identification index is one, the bits of the second through seventh binary groups shall be used to record the date in binary coded decimal format. The binary groups shall be assigned as fol
14、lows: Binary group Contents Second Units of the day of the month Third Tens of the day of the month Fourth Units of the month Fifth Tens of the month Sixth Units of the year Seventh Tens of the year The date will be displayed in increasing quantities of time: day, month, year. RP 135-2004 Page 3 of
15、4 pages 4.4.3 Entry 2 When the value of the data identification index is two, the bits of the second through seventh binary groups shall be used to record a production identification number or code in binary coded decimal format. 4.4.4 Entry 3 When the value of the data identification index is three
16、, the bits of the second through seventh binary groups shall be used to record a four-digit equipment identification number or code. For example, if more than one camera is used, the camera number could be recorded. This code may be alphanumeric and shall be recorded with the 6-bit character set des
17、cribed in clause 5. Any of the character symbols may also be used. 4.4.5 Entry 4 When the value of the data identification index is four, the bits of the second through seventh binary groups shall be used to record a four-digit scene number. This number may be alphanumeric and shall be recorded with
18、 the 6-bit character set described in clause 5. Any of the character symbols may also be used. 4.4.6 Entry 5 When the value of the data identification index is five, the bits of the second through seventh binary groups shall be used to record a four-digit take number. This number may be alphanumeric
19、 and shall be recorded with the 6-bit character set described in clause 5. Any of the character symbols may also be used. 4.4.7 Entry 6 When the value of the data identification index is six, the bits of the second through seventh binary groups shall be used to record a four-digit roll number. For e
20、xample, when recording sound, this number could identify the roll of magnetic tape, or when shooting pictures, this roll could identify the roll of film. This number may be alphanumeric and shall be recorded with the 6-bit character set described in clause 5. Any of the character symbols may also be
21、 used. 4.4.8 Entries 7 through 14 These index values are unassigned and shall not be used. Their assignment is reserved to the SMPTE. 4.4.9 Entry 15 When the value of the data identification index is 15, an extended directory is invoked. The second binary group becomes an extended data identificatio
22、n index and data is recorded in the third through seventh binary groups. No extended data identification values are assigned at this time and their assignment in the future is reserved to the SMPTE. Until they are assigned, a data indication index of 15 shall not be used. 5 Six-bit character format
23、5.1 Certain types of data are recorded using a six-bit character set. This section specifies the allocation of the four-bit user groups when recording this type of data and the character set to be used. 5.1.1 Use of the bits The data bits of the second through seventh binary groups shall be assigned
24、 as specified in table 3. 5.1.2 Character set The character set shall be as defined in table 4. This character set is a subset of the one defined in ISO 2022. RP 135-2004 Page 4 of 4 pages Table 3 Data bit assignment Bits, type C code Bits, type B code Use 12, 13, 14, 15, 20, 21 36, 37, 38, 39, 44,
25、45 Least significant character 22, 23, 28, 29, 30, 31 46, 47, 52, 53, 54, 55 Character 36, 37, 38, 39, 44, 45 60, 61, 62, 63, 68, 69 Character 46, 47, 52, 53, 54, 55 70, 71, 76, 77, 78, 79 Most significant character Table 4 Six-bit character set Character Binary equivalent Decimal equivalent Charact
26、er Binary equivalent Decimal equivalent space ! # $ % ? 000000 000001 000010 000011 000100 000101 000110 000111 001000 001001 001010 001011 001100 001101 001110 001111 010000 010001 010010 010011 010100 010101 010110 010111 011000 011001 011010 011011 011100 011101 011110 011111 0 1 2 3 4 5 6 7 8 9
27、10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 Annex A (informative) Bibliography ISO/IEC 2022:1994, Information Technology Character Code Structure and Extension Techniques
