International organisation for standardisation organisation internationale de normalisation
Audio plenary, joint meeting and task group activities
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- 4.3Audio opening plenary discussions
- 4.4Joint Meetings
- 4.4.2Joint with MDS, Req on technology demonstration: descriptors for perceptual mood attributes
- 4.4.3Joint meeting with ISG, Audio, Video on Coding Tool Repository
- 4.4.4Req, Vid, Aud, MDS MPEG-7 issues
4Audio plenary, joint meeting and task group activities4.1Review of AHG reportsThere were no requests to review any of the AHG reports. 4.2Received national body comments and liaison mattersThe Audio Chair presented the USNB Comment listed in Section 2.5. The topic was discussed at length, and a response was drafted. This discussion was re-opened during closing Audio plenary, and a response with unanimous support was drafted. The full response can be found in N7191, and is excerpted here: It is the consensus of the Audio Subgroup that since the Call for Information on Scalable Speech and Audio Coding issued at the 71st MPEG meeting and responses are not due until the 73rd MPEG meeting, the CfI text cannot be changed at this time. However, WG11 advises the USNB that the following concerns will be given attention during the evaluation of the responses to the CfI:
4.3Audio opening plenary discussionsKurt Jacobson, University of Miami, presented
The University of Miami has produced a database of music for UoM owns all copyright, and which UoM is willing to make available to MPEG and the companies of MPEG delegates. The music consists of mono, stereo and 5.1 channel sequences at 48 kHz sampling rate and 24-bit word length. They propose three use levels:
Different music is available for the different use levels. For example, only a restricted set of material is available for unrestricted use. The Chair noted that MPEG is happy to publicize components of the music database that are available free of charge, but cannot be a forum for publicizing fee-based components of the database. Pierrick Philippe, France Telecom, presented
This is an update of a document that is now more than a year old. There was quite a bit of work done since the last MPEG meeting, particularly in the section on scalable coding tools. However there are some sections that still need work. They are: Performance of MPEG audio codecs Current usage of MPEG audio codecs The Chair encourages members of the Audio Subgroup to complete some of this information during the week. Jim Johnston, Microsoft, presented
There was quite a bit of discussion of this contribution. It was the consensus of the Audio Subgroup to take no action 4.4Joint Meetings4.4.1Joint with MDS, Req on Content Protection for MAF Music PlayerStefan Kraegeloh, FhG, presented
This presented two possibilities for extending the MPEG-A Music Player MAF, those being to add
A number of scenarios were presented in which the proposed extension to MPEG-A Music Player MAF could be used. Next steps in standardizing any portion of this proposal could be to:
Stefan Kraegeloh, FhG, presented
The contribution acknowledges that it is very desirable that any encryption algorithm be open, and has passed widespread review and scrutiny. Advanced Encryption Algorithm (AES), is proposed as such an algorithm The Convenor noted that the virtue of MPEG is to specify a simple solution to a pervasive problem. Zvi Lifshitz presented
This proposes to monitor consumption rather than distribution. Give privilege to decode to a “home domain” so that how e.g. music is used now is not significantly altered with respect to how it is used in the proposal (i.e. one can play a CD that you own in any CD player that you own). The proposal desires to limit options so as to promote interoperability. A key part of the proposal is that the Digital Item requires no additional information other than what is inside the item. (no a-priori knowledge is required). The consensus of the joint meeting was that:
4.4.2Joint with MDS, Req on technology demonstration: descriptors for perceptual mood attributesBenjamin Dorn, Moodlogic, presented
This contribution presented three use cases dealing with interactive playlist generation and music selection or recommendation. The use cases obviously require interoperability, and this demands more than just a container for metadata, but rather a process for determining the metadata value such that it insures interoperability. It is envisioned that this process involves human subjective judgements, but done in a way that the final metadata value is largely consistent across metadata providers. Benjamin Dorn, Moodlogic, presented
Fernando Pereira noted that there is an “Affective Description Scheme” that might meet the needs of this application, and Ian Burnett proposed that the Affective DS could be augmented to meet the needs of this proposal. Fernando Pereira further noted that such a proposal should both support interoperability and also have wide industry support. The consensus was that Audio should propose a core experiment with independent participants (so as to check interoperability). Moodlogic data could be used as ground truth, and well-known % correct methodology used as a figure of merit. A next or possibly concurrent step would be to check if it could be implemented as an extension to Affective DS. 4.4.3Joint meeting with ISG, Audio, Video on Coding Tool RepositoryAudio has tools at the granularity of coders, in which tool resources can be allocated, accessUnits decoded, and resources freed. Video will have two output documents that describe their efforts on video coding tools. An open issue is how to integrate the coding tools into a new codec, that is, what API could the coding tools have such that they are maximally re-usable. This is a worthy goal even if the resulting codec is far below the theoretical computationally efficiency. The coding tool repository concept has two positive impacts on the standardization process: first, it may lead to faster development of standards via re-use, and second it may dramatically lessen the cost of conformance specification if conformance is conducted on a per-tool basis. Possible audio tools that are at the level of the video tool granularity are: Bit stream bit field extraction Entropy decoder (Huffman or Arithmetic) Power-law inverse quantizer Joint channel coding tools TNS IMDCT
SBR A complete list of Audio tools can be found in ISO/IEC 14496-3, subpart 1, subclause 1.5.1.1 “Audio object type definition”, Table 1.1 “Audio Object Type definition based on Tools/Modules”. In the case of video, there is also the concept of replacing a software-based tool with a hardware module. It is not clear that audio algorithms could benefit from that level (i.e. ASIC realization) of computational resources. The vision is to have a CE process for the tool repository such that MPEG is assured that the tools in the repository are of high quality. This CE process could be to construct a new coder using the new tool and showing some improved performance or functionality. With such a tool repository, it is conceivable that new coders and the associated specification text, reference source code and conformance test data could be assembled at months instead of years.
4.4.5Systems, Aud, M3WThe primary goal of MultiMediaMiddleWare is to present a logical interface to a user application that is an abstraction of any of several possible specific implementations. Beyond codec intialization, processing and freeing of codec resources, M3W offers extensive maintenance capabilities. The current status is that there have been responses to a CfP, and some of those have been incorporated into a WD. The functional (e.g. decoding) interfaces can be at the level of codec (as in the Audio Tool Repository) or tool (as in the Video Coding Tool Repository). Obviously, there may be significant synergy between the Audio and Video Coding Tools Repository and M3W. The M3W effort needs Audio assistance to be sure that the functional interface meets the needs of Audio. A CfP on functional components will issue at this meeting. Directory: sc29 -> open -> 29view 29view -> International organisation for standardisation organisation internationale de normalisation 29view -> International organisation for standardisation organisation internationale de normalisation Download 3.13 Mb. Share with your friends:
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