cellar S. Lhomme Internet-Draft Intended status: Standards Track M. Bunkus Expires: 12 April 2022 D. Rice 9 October 2021 Matroska Media Container Chapter Codecs Specifications draft-ietf-cellar-chapter-codecs-00 Abstract This document defines common Matroska Chapter Codecs, the basic Matroska Script and the DVD inspired DVD menu. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 12 April 2022. Copyright Notice Copyright (c) 2021 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Lhomme, et al. Expires 12 April 2022 [Page 1] Internet-Draft Matroska Chapter Codecs October 2021 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Status of this document . . . . . . . . . . . . . . . . . . . 2 3. Security Considerations . . . . . . . . . . . . . . . . . . . 2 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 2 5. Notation and Conventions . . . . . . . . . . . . . . . . . . 2 6. Matroska Chapter Codecs . . . . . . . . . . . . . . . . . . . 2 6.1. Matroska Script (0) . . . . . . . . . . . . . . . . . . . 3 6.2. DVD menu (1) . . . . . . . . . . . . . . . . . . . . . . 3 7. Normative References . . . . . . . . . . . . . . . . . . . . 6 8. Informative References . . . . . . . . . . . . . . . . . . . 6 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6 1. Introduction _TODO_ 2. Status of this document This document is a work-in-progress specification defining the Matroska file format as part of the IETF Cellar working group (https://datatracker.ietf.org/wg/cellar/charter/). It uses basic elements and concepts already defined in the Matroska specifications defined by this workgroup. 3. Security Considerations Tag values can be either strings or binary blobs. This document inherits security considerations from the EBML and Matroska documents. 4. IANA Considerations To be determined. 5. Notation and Conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 6. Matroska Chapter Codecs _TODO_ Lhomme, et al. Expires 12 April 2022 [Page 2] Internet-Draft Matroska Chapter Codecs October 2021 6.1. Matroska Script (0) This is the case when ChapProcessCodecID = 0. This is a script language build for Matroska purposes. The inspiration comes from ActionScript, javascript and other similar scripting languages. The commands are stored as text commands, in UTF-8. The syntax is C like, with commands spanned on many lines, each terminating with a ";". You can also include comments at the end of lines with "//" or comment many lines using "/* */". The scripts are stored in ChapProcessData. For the moment ChapProcessPrivate is not used. The one and only command existing for the moment is GotoAndPlay( ChapterUID );. As the same suggests, it means that, when this command is encountered, the Matroska Player SHOULD jump to the Chapter specified by the UID and play it. 6.2. DVD menu (1) This is the case when ChapProcessCodecID = 1. Each level of a chapter corresponds to a logical level in the DVD system that is stored in the first octet of the ChapProcessPrivate. This DVD hierarchy is as follows: Lhomme, et al. Expires 12 April 2022 [Page 3] Internet-Draft Matroska Chapter Codecs October 2021 +====================+======+===========+==========+=============+ | ChapProcessPrivate | DVD | Hierarchy | Commands | Comment | | | Name | | Possible | | +====================+======+===========+==========+=============+ | 0x30 | SS | DVD | - | First Play, | | | | domain | | Video | | | | | | Manager, | | | | | | Video Title | +--------------------+------+-----------+----------+-------------+ | 0x2A | LU | Language | - | Contains | | | | Unit | | only PGCs | +--------------------+------+-----------+----------+-------------+ | 0x28 | TT | Title | - | Contains | | | | | | only PGCs | +--------------------+------+-----------+----------+-------------+ | 0x20 | PGC | Program | * | | | | | Group | | | | | | Chain | | | | | | (PGC) | | | +--------------------+------+-----------+----------+-------------+ | 0x18 | PG | Program 1 | - | | | | | / Program | | | | | | 2 / | | | | | | Program 3 | | | +--------------------+------+-----------+----------+-------------+ | 0x10 | PTT | Part Of | - | Equivalent | | | | Title 1 / | | to the | | | | Part Of | | chapters on | | | | Title 2 | | the sleeve. | +--------------------+------+-----------+----------+-------------+ | 0x08 | CN | Cell 1 / | - | | | | | Cell 2 / | | | | | | Cell 3 / | | | | | | Cell 4 / | | | | | | Cell 5 / | | | | | | Cell 6 | | | +--------------------+------+-----------+----------+-------------+ Table 1 You can also recover wether a Segment is a Video Manager (VMG), Video Title Set (VTS) or Video Title Set Menu (VTSM) from the ChapterTranslateID element found in the Segment Info. This field uses 2 octets as follows: 1. Domain Type: 0 for VMG, the domain number for VTS and VTSM 2. Domain Value: 0 for VMG and VTSM, 1 for the VTS source. Lhomme, et al. Expires 12 April 2022 [Page 4] Internet-Draft Matroska Chapter Codecs October 2021 For instance, the menu part from VTS_01_0.VOB would be coded [1,0] and the content part from VTS_02_3.VOB would be [2,1]. The VMG is always [0,0] The following octets of ChapProcessPrivate are as follows: +=========+======+=================================================+ | Octet 1 | DVD | Following Octets | | | Name | | +=========+======+=================================================+ | 0x30 | SS | Domain name code (1: 0x00= First play, 0xC0= | | | | VMG, 0x40= VTSM, 0x80= VTS) + VTS(M) number (2) | +---------+------+-------------------------------------------------+ | 0x2A | LU | Language code (2) + Language extension (1) | +---------+------+-------------------------------------------------+ | 0x28 | TT | global Title number (2) + corresponding TTN of | | | | the VTS (1) | +---------+------+-------------------------------------------------+ | 0x20 | PGC | PGC number (2) + Playback Type (1) + Disabled | | | | User Operations (4) | +---------+------+-------------------------------------------------+ | 0x18 | PG | Program number (2) | +---------+------+-------------------------------------------------+ | 0x10 | PTT | PTT-chapter number (1) | +---------+------+-------------------------------------------------+ | 0x08 | CN | Cell number [VOB ID(2)][Cell ID(1)][Angle | | | | Num(1)] | +---------+------+-------------------------------------------------+ Table 2 If the level specified in ChapProcessPrivate is a PGC (0x20), there is an octet called the Playback Type, specifying the kind of PGC defined: * 0x00: entry only/basic PGC * 0x82: Title+Entry Menu (only found in the Video Manager domain) * 0x83: Root Menu (only found in the VTSM domain) * 0x84: Subpicture Menu (only found in the VTSM domain) * 0x85: Audio Menu (only found in the VTSM domain) * 0x86: Angle Menu (only found in the VTSM domain) * 0x87: Chapter Menu (only found in the VTSM domain) Lhomme, et al. Expires 12 April 2022 [Page 5] Internet-Draft Matroska Chapter Codecs October 2021 The next 4 following octets correspond to the User Operation flags in the standard PGC. When a bit is set, the command SHOULD be disabled. ChapProcessData contains the pre/post/cell commands in binary format as there are stored on a DVD. There is just an octet preceding these data to specify the number of commands in the element. As follows: [# of commands(1)][command 1 (8)][command 2 (8)][command 3 (8)]. More information on the DVD commands and format on DVD from the [DVD-Info] project. 7. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . 8. Informative References [DVD-Info] "DVD-Video Information", . Authors' Addresses Steve Lhomme Email: slhomme@matroska.org Moritz Bunkus Email: moritz@bunkus.org Dave Rice Email: dave@dericed.com Lhomme, et al. Expires 12 April 2022 [Page 6]