ISO/IEC 23001-10:2020/PRF Amd 2

International
Standard
ISO/IEC 23001-10
Second edition
Information technology — MPEG
2020-04
systems technologies —
AMENDMENT 2
Part 10:
Carriage of timed metadata
metrics of media in ISO base media
file format
AMENDMENT 2: Support for display
attenuation map
PROOF/ÉPREUVE
Reference number
ISO/IEC 23001-10/Amd. 2:2025(en) © ISO/IEC 2025

ISO/IEC 23001-10/Amd. 2:2025(en)
© ISO/IEC 2025
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Foreword
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Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
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© ISO/IEC 2025 – All rights reserved
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ISO/IEC 23001-10/Amd. 2:2025(en)
Information technology — MPEG systems technologies —
Part 10:
Carriage of timed metadata metrics of media in ISO base
media file format
AMENDMENT 2: Support for display attenuation map

Clause 2
Add the following reference at the end of the clause:
ISO/IEC 14496-15:2022, Information technology — Coding of audio-visual objects — Part 15: Carriage of
network abstraction layer (NAL) unit structured video in the ISO base media file format

Clause 5
Add the following subclauses at the end of the clause:

5.4  Display attenuation map metadata
5.4.1  General
A display attenuation map video is a 2D video where each frame conveys pixel-wise information that can be
applied to a corresponding frame in the original video sequence through a processing operation to reduce
the total energy consumption resulting from rendering the frames of that video.
5.4.2  Attenuation map information box
5.4.2.1  Definition
An AttenuationMapInformationBox contains information about the characteristics of the display attenuation
map data stream carried by the track in which it is signalled. It is identified by the 4CC ‘amid’. The information
in the payload of the track may include pre-processing operations that should be applied to the samples of
the display attenuation map as well as other information that can distinguish one display attenuation map
track from another for the same content, which enables a player to select the most suitable track based on its
energy reduction strategy.
5.4.2.2.  Syntax
aligned(8) class AMIApproximationModel() {
bit(4) reserved = 0;
unsigned int(4) ami_map_approx_model;
}
aligned(8) class AMIWindowInfo() {
unsigned int(8) ami_window_x;
unsigned int(8) ami_window_y;
unsigned int(8) ami_window_width;
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unsigned int(8) ami_window_height;
}
aligned(8) class AMIVideoQualityInfo() {
bit(5) reserved = 0;
unsigned int(3) ami_quality_metric;
unsigned int(8) ami_quality_reduction;
}
aligned(8) class AMIPreprocessingInfo() {
bit(6) reserved = 0;
unsigned int(2) ami_preprocessing_type;
unsigned int(8) ami_max_value;
unsigned int(8) ami_preprocessing_scale;
}
aligned(8) class AttenuationMapInformationBox() extends FullBox('amid', version = 0, flags) {

bit(3) reserved = 0;
unsigned int(1) ami_preprocessing_info_present_flag;
unsigned int(1) ami_approx_model_present_flag;
unsigned int(1) ami_window_info_present_flag;
unsigned int(1) ami_video_quality_info_present_flag;

unsigned int(5) ami_energy_reduction_rate;
unsigned int(4) ami_display_model;
unsigned int(4) ami_attenuation_use_idc;
unsigned int(4) ami_attenuation_component_idc;

if (ami_preprocessing_info_present_flag) {
AMIPreprocessingInfo();
}
if (ami_approx_model_present_flag) {
AMIApproximationModel();
}
if (ami_window_info_present_flag) {
AMIWindowInfo();
}
if (ami_video_quality_info_present_flag) {
AMIVideoQualityInfo();
}
}
5.4.2.3  Semantics
The semantics of the fields defined in AttenuationMapInformationBox are as follows:
ami_preprocessing_info_present_flag is a flag indicating whether preprocessing information is present.
Value 1 indicates that the box contains preprocessing information.
ami_approx_model_present_flag is a flag indicating whether approximation model information is present.
Value 1 indicates that the box contains approximation model information.
ami_window_info_present_flag is a flag indicating whether window information is present. Value 1 indicates
that the box contains window information.
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ami_video_quality_info_present_flag is a flag indicating whether video quality information is present.
Value 1 indicates that the box contains video quality information.
ami_energy_reduction_rate indicates the expected energy saving rate (percentage) when the video
is displayed after applying the display attenuation map sample values on the sample values of the
associated video.
ami_display_model indicates the display models on which the display attenuation map sample values may
be used. The semantics of the bits of this field are described in Table 1.

Table 1 — Semantics of the bits of the ami_display_model field
Bit number Display model
0 Transmissive pixel
1 Emissive pixel
2 . 3 Reserved for future use

ami_attenuation_use_idc indicates which operation shall be used to ap
...