ISO/IEC 13818-4:1998/Amd 1:1999/Cor 1:2003

Information technology — Generic coding of moving pictures and associated audio information — Part 4: Conformance testing — Amendment 1: Advanced Audio Coding (AAC) conformance testing — Technical Corrigendum 1

Technologies de l'information — Codage générique des images animées et des informations sonores associées — Partie 4: Essais de conformité — Amendement 1: Essai de conformité de codage audio avancé — Rectificatif technique 1

General Information

• Status: Withdrawn
• Publication Date: 05-Mar-2003
• Withdrawal Date: 05-Mar-2003
• ICS: 35.040 - Information coding
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 13-Dec-2004

Relations

• Revised: ISO/IEC 13818-4:2004 - Information technology — Generic coding of moving pictures and associated audio information — Part 4: Conformance testing
• Effective Date: 15-Apr-2008
• Corrects: ISO/IEC 13818-4:1998/Amd 1:1999 - Information technology — Generic coding of moving pictures and associated audio information — Part 4: Conformance testing — Amendment 1: Advanced Audio Coding (AAC) conformance testing
• Effective Date: 06-Jun-2022
• Child: ISO/IEC 13818-4:1998/Amd 1:1999 - Information technology — Generic coding of moving pictures and associated audio information — Part 4: Conformance testing — Amendment 1: Advanced Audio Coding (AAC) conformance testing
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL STANDARD ISO/IEC 13818-4:1998/Amd.1:1999
TECHNICAL CORRIGENDUM 1
Published 2003-03-01

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
INTERNATIONAL ELECTROTECHNICAL COMMISSION • МЕЖДУНАРОДНАЯ ЭЛЕКТРОТЕХНИЧЕСКАЯ КОМИССИЯ • COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE


Information technology — Generic coding of moving pictures
and associated audio information —
Part 4:
Conformance testing
AMENDMENT 1: Advanced Audio Coding (AAC) conformance
testing
TECHNICAL CORRIGENDUM 1
Technologies de l'information — Codage générique des images animées et des informations sonores
associées —
Partie 4: Essais de conformité
AMENDEMENT 1: Essai de conformité de codage audio avancé
RECTIFICATIF TECHNIQUE 1
Technical Corrigendum 1 to ISO/IEC 13818-4:1998/Amd.1:1999 was prepared by Joint Technical Committee
ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and
hypermedia information.

ICS 35.040 Ref. No. ISO/IEC 13818-4:1998/Amd.1:1999/Cor.1:2003(E)
©  ISO/IEC 2003 – All rights reserved
Published in Switzerland

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ISO/IEC 13818-4:1998/Amd.1:1999/Cor.1:2003(E)
Throughout the text, replace
“

program_configuration_element
“

with
“

program_config_element
“.


In subclause 2.6.4.2 (Decoder Modifications), replace
“

Bitstream Characteristic Normative Clause Variation
sampling rate 3 a decoder may support only a subset of possible
sampling rates, decoder manufacturers must specify
the rates which are supported
profile 2.1 a decoder may support additional channel elements
beyond the minimums listed for its profile
program configuration 3.5 a decoder is only required to decode one program of a
multi-program bitstream
data_stream_element 3.6 a decoder is not required to store or present data
recovered from data_stream_elements
mono-mixdown element 3.3.8 a decoder is not required to present audio from the
mono-mixdown element
stereo-mixdown element 3.3.8 a decoder is not required to present audio from the
stereo-mixdown element
matrix-mixdown 3.3.8 a decoder is not required to calculate a matrix-
mixdown signal

2 ©  ISO/IEC 2003 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/IEC 13818-4:1998/Amd.1:1999/Cor.1:2003(E)
”
with
“
Bitstream Characteristic Normative Clause Variation/Restriction
sampling rate 8 a decoder may support only a subset of possible
sampling rates, decoder manufacturers must specify
the rates which are supported
profile 7.1 a decoder may support additional channel elements
beyond the minimums listed for its profile
program configuration 8.5 a decoder is only required to decode one program of a
multi-program bitstream
the specified minimum decoder capabilities refer to
the channels within a bitstream (not within a program)
if program config elements are used, syntactic
elements (other than ID_FILL or ID_END) not
referenced by any program config element are not
allowed
a decoder conforming to the Main profile, the LC
profile, or the SSR profile is not required to support
bitstreams containing more than one program (in the
sense of what is specified in a program config
element)
data_stream_element 8.6 a decoder is not required to store or present data
recovered from data_stream_elements
mono-mixdown element 8.3.8 a decoder conforming to the Main profile, the LC
profile, or the SSR profile is not required to support
bitstreams containing any mono-mixdown element
stereo-mixdown element 8.3.8 a decoder conforming to the Main profile, the LC
profile, or the SSR profile is not required to support
bitstreams containing any stereo-mixdown element
matrix-mixdown 8.3.8 a decoder is not required to calculate a matrix-
mixdown signal
“.
Add subclause 2.6.5.0 (Profile Specification)
“
2.6.5.0 Profile Specification
The same naming convention as used for decoders is applied to bitstreams (see 2.6.4.1). The channel specification within
the naming convention is based on the bitstream, independent of any program specification. There shall be only one
program (in the sense of what is specified in a program config element) in an Main, Low Complexity, or SSR profile
conformant bitstream.
”.

©  ISO/IEC 2003 – All rights reserved 3

---------------------- Page: 3 ----------------------
ISO/IEC 13818-4:1998/Amd.1:1999/Cor.1:2003(E)
In subclause 2.6.5.1 (Parsing an ADIF header), add
“
copyright_id_present: no restrictions apply.
copyright_id: cross check with the Registration Authority.
original_copy: no restrictions apply.
home: no restrictions apply.
bitstream_type: no restrictions apply.
bitrate: no restrictions apply.
num_program_config_elements: shall be 0 for the profiles AAC Main, AAC LC and AAC SSR.
adif_buffer_fullness: shall be in the range of 0 and 6144 * NCC - mean_frame_length (in bits).
“.

In subclause 2.6.5.2.1 (adts_fixed_header), add
“
All data elements of the adts_fixed_header() shall not change from frame to frame.
protection_absent: no restrictions apply, but the data element shall not change from frame to frame.
private_bit: no restrictions apply, but the data element shall not change from frame to frame.
channel_configuration: no restrictions apply, but the data element shall not change from frame to frame.
original_copy: no restrictions apply, but the data element shall not change from frame to frame.
home: no restrictions apply, but the data element shall not change from frame to frame.
“.

In subclause 2.6.5.2.2 (adts_variable_header), replace
“
frame_length: shall be encoded with the length of the frame, including headers and error check (if present)
“
with
“
copyright_identification_bit: cross check with the Registration Authority.
copyright_identification_start: ´1´ if new copyright_id starts, otherwise ´0´.
frame_length: shall be encoded with the length of the adts_frame in bytes.
adts_buffer_fullness: shall be in the range of 0 and INT ( ( 6144 - mean_frame_length / NCC ) / 32 ).
number_of_raw_data_blocks_in_frame: no restrictions apply.
“.

Add subclause 2.6.5.2.3 (adts_error_check)
“
2.6.5.2.3 adts_error_check
crc_check: refer to the definition of adts_error_check() in ISO/IEC 13818-7.
“.

Add subclause 2.6.5.2.4 (adts_header_error_check)
“
2.6.5.2.4 adts_header_error_check
raw_data_block_position[i]: shall be encoded with the start position of raw_data_block(i) measured as an offset in bytes
from start position of raw_data_block(0).
crc_check: refer to the definition of adts_header_error_check() in ISO/IEC 13818-7.
“.
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