Atsc working Draft Template
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number_strings 8 uimsbf for (i=0; i< number_strings; i++) { ISO_639_language_code 24 uimsbf number_segments 8 uimsbf for (j=0; j< number_segments; j++) { compression_type 8 uimsbf mode 8 uimsbf number_bytes 8 uimsbf for (k=0; k< number_bytes; k++) compressed_string_byte [k] 8 bslbf } } } 79 ATSC A/65:2013 Program and System Information Protocol 7 August 2013 Null strings (strings with no characters) may be represented in several ways. Null strings should be encoded with number_strings set to zero as it is the most efficient encoding. Null strings may also be encoded by setting all instances of number_segments to zero; or by setting all instances of number_bytes to zero. number_strings – This 8-bit unsigned integer field identifies the number of strings in the following data. ISO_639_language_code – This 3-byte (24 bits) field, in conformance with ISO 639.2/B [10], specifies the language used for the i th string. When number_segments is zero, this field has no meaning. number_segments – This 8-bit unsigned integer field identifies the number of segments in the following data. A specific mode is assigned for each segment. compression_type – This 8-bit field identifies the compression type for the j th segment. Allowed values for this field shall be as shown in Table 6.40. Compression types 0x01 and 0x02 shall be restricted for use with text mode 0x00. When number_bytes is zero, this field has no meaning. Download 4.82 Kb. Do'stlaringiz bilan baham: |
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