Network Working Group R. Huang Internet-Draft Q. Wu Intended status: Standards Track Huawei Expires: January 17, 2013 H. Asaeda Keio University G. Zorn, Ed. Network Zen July 16, 2012 RTCP XR Report Block for TS Decodability Statistics Metric reporting draft-huang-xrblock-rtcp-xr-decodability-04 Abstract Transport Stream is a standard container format used in the transmission and storage of multimedia data. Unicast/Multicast/ Broadcast MPEG-TS over RTP is widely adopted in the IPTV deployment. This document defines an RTCP XR Report Block that allows the reporting of decodability statistics metrics related to transmissions of MPEG-TS over RTP. 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 http://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 January 17, 2013. Copyright Notice Copyright (c) 2012 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 (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents Huang, et al. Expires January 17, 2013 [Page 1] Internet-Draft RTCP XR Decodability Report Blocks July 2012 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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 3 3. TR 101 290 Decodability Statistics Metric Report Block . . . . 3 4. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6 6. Security Considerations . . . . . . . . . . . . . . . . . . . . 7 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.1. Normative References . . . . . . . . . . . . . . . . . . . 7 7.2. Informative References . . . . . . . . . . . . . . . . . . 8 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8 Huang, et al. Expires January 17, 2013 [Page 2] Internet-Draft RTCP XR Decodability Report Blocks July 2012 1. Introduction This draft defines a new block type to augment those defined in [RFC3611] for use with Transport Stream (TS) [ISO-IEC.13818-1.2007]. The new block type supports reporting on the consistency of important elements in the transport stream. This new block type can be useful for measuring content stream or TS quality by checking TS header information [ETSI] and identifying the existence, and characterizing the severity, of bitstream packetization problem which may affect users' perception of a service delivered over RTP; it may also be useful for verifying the continued correct operation of an existing system management. The new report block is in compliance with the monitoring architecture specified in [MONARCH] and the Performance Metrics Framework [RFC6390]. The metric is applicable to any type of RTP application that uses TS standard format for container of multimedia data, for example MPEG4 TS content over RTP. 2. Terminology 2.1. Standards Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 3. TR 101 290 Decodability Statistics Metric Report Block This block reports decodability statistics metrics beyond the information carried in the standard RTCP packet format. It defines eight metrics based on ETSI TR 101 290. ETSI TR 101 290 focuses on what kind of de-codability errors occur and specifies over 30 measurements split into three different priorities, depending on how drastically they affect content stream[ETSI] . The parameters from priority 1 or 2 are either considered necessary to ensure decodability or recommended for continuous monitoring. The parameters from priority 3 are not applied to every MPEG-TS implememtation and regarded as application dependent monitoring specific. However ETSI TR_101_290 does not specify how many de- codability errrors happen when the client receives a sequence of consecutive RTP packets. The metrics defined in this block are used to deal with this issue. It accommodates three basic monitoring parameters in priority 1 to ensure that the TS can be decoded and report the number of TS_sync_losses, Sync_byte_errors, Continuity_count_errors; It also accommodates 5 continuous monitoring Huang, et al. Expires January 17, 2013 [Page 3] Internet-Draft RTCP XR Decodability Report Blocks July 2012 parameters in priority 2 and report the number of Transport_errors, PCR_errors, PCR_repetition_errors, PCR_discontinuity_indicator_errors, and PTS_errors [ETSI]. The other parameters are ignored since they are not applied to all the MPEG implantations. The Decodability Metrics Block has the following format: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BT=TBD | rvd | block length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | SSRC of source | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | begin_seq | end_seq | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Number of TSs | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | TS_sync_loss_count | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sync_byte_error_count | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Continuity_count_error_count | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Transport_error_count | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | PCR_error_count | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | PCR_repetition_error_count | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | PCR_discontinuity_indicator_error_count | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | PTS_error_count | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ block type (BT): 8 bits A TR 101 290 decodability metrics report block is identified by the constant . rvd: 8 bits This field is reserved for future definition. In the absence of such a definition, the bits in this field MUST be set to zero and SHOULD be ignored by the receiver. Huang, et al. Expires January 17, 2013 [Page 4] Internet-Draft RTCP XR Decodability Report Blocks July 2012 block length: 16 bits The constant 11, in accordance with the definition of this field in Section 3 of RFC 3611 [RFC3611]. SSRC of source: 32 bits As defined in Section 4.1 of [RFC3611]. begin_seq: 16 bits As defined in Section 4.1 of [RFC3611]. end_seq: 16 bits As defined in Section 4.1 of [RFC3611]. Number of TSs: 32 bits Number of TS in the above sequence number interval. TS_sync_loss_count: 32 bits Number of TS_sync_loss errors in the above sequence number interval. Sync_byte_error_count: 32 bits Number of sync_byte_errors in the above sequence number interval. Continuity_count_error_count: 32 bits Number of Continuity_count_errors in the above sequence number interval. Transport_error_count: 32 bits Number of Transport_errors in the above sequence number interval. PCR_error_count: 32 bits Number of PCR_errors in the above sequence number interval. PCR_repetition_error_count: 32 bits Number of PCR_repetition_errors in the above sequence number interval. Huang, et al. Expires January 17, 2013 [Page 5] Internet-Draft RTCP XR Decodability Report Blocks July 2012 PCR_discontinuity_indicator_error_count: 32 bits Number of PCR_discontinuity_indicator_errors in the above sequence number interval. PTS_error_count: 32 bits Number of PTS_errors in the above sequence number interval. 4. SDP Signaling One new parameter is defined for the report block defined in this document to be used with Session Description Protocol (SDP) [RFC4566] using the Augmented Backus-Naur Form (ABNF) [RFC5234]. It has the following syntax within the "rtcp-xr" attribute [RFC3611]: rtcp-xr-attrib = "a=rtcp-xr:" [xr-format *(SP xr-format)] CRLF xr-format = decodability-metrics decodability-metrics = "decodability-metrics" Refer to Section 5.1 of RFC 3611 [RFC3611] for a detailed description and the full syntax of the "rtcp-xr" attribute. 5. IANA Considerations New report block types for RTCP XR are subject to IANA registration. For general guidelines on IANA allocations for RTCP XR, refer to Section 6.2 of [RFC3611]. This document assigns one new block type value in the RTCP XR Block Type Registry: Name: TDM Long Name: TR 101 290 Decodability Metrics Value Reference: section 3 This document also registers one SDP [RFC4566] parameters for the "rtcp-xr" attribute in the RTCP XR SDP Parameter Registry: Huang, et al. Expires January 17, 2013 [Page 6] Internet-Draft RTCP XR Decodability Report Blocks July 2012 * "decodability-metrics" The contact information for the registrations is: Rachel Huang rachel.huang@huawei.com 101 Software Avenue, Yuhua District Nanjing, JiangSu 210012 China 6. Security Considerations This proposed RTCP XR report block introduces no new security considerations beyond those described in [RFC3611]. 7. References 7.1. Normative References [ETSI] ETSI, "Digital Video Broadcasting (DVB); Measurement guidelines for DVB systems", Technical Report TR 101 290, 2001. [ISO-IEC.13818-1.2007] International Organization for Standardization, "Information technology - Generic coding of moving pictures and associated audio information: Systems", ISO International Standard 13818-1, October 2007. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2250] Hoffman, D., Fernando, G., Goyal, V., and M. Civanlar, "RTP Payload Format for MPEG1/MPEG2 Video", RFC 2250, January 1998. [RFC3550] Schulzrinne, H., Casner, S., Frederick, R., and V. Jacobson, "RTP: A Transport Protocol for Real-Time Applications", STD 64, RFC 3550, July 2003. [RFC3611] Friedman, T., Caceres, R., and A. Clark, "RTP Control Protocol Extended Reports (RTCP XR)", RFC 3611, November 2003. [RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session Description Protocol", RFC 4566, July 2006. Huang, et al. Expires January 17, 2013 [Page 7] Internet-Draft RTCP XR Decodability Report Blocks July 2012 [RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", STD 68, RFC 5234, January 2008. 7.2. Informative References [MONARCH] Wu, Q., Hunt, G., and P. , "Monitoring Architectures for RTP", ID draft-ietf-avtcore-monarch-17, June 2012. [RFC6390] Clark, A. and B. Claise, "Guidelines for Considering New Performance Metric Development", BCP 170, RFC 6390, October 2011. Authors' Addresses Rachel Huang Huawei 101 Software Avenue, Yuhua District Nanjing 210012 China Email: rachel.huang@huawei.com Qin Wu Huawei 101 Software Avenue, Yuhua District Nanjing, Jiangsu 210012 China Email: bill.wu@huawei.com Hitoshi Asaeda Keio University Graduate School of Media and Governance 5322 Endo Fujisawa, Kanagawa 252-0882 Japan Email: asaeda@wide.ad.jp Huang, et al. Expires January 17, 2013 [Page 8] Internet-Draft RTCP XR Decodability Report Blocks July 2012 Glen Zorn (editor) Network Zen 227/358 Thanon Sanphawut Bang Na, Bangkok 10260 Thailand Phone: +66 (0) 87-040-4617 Email: glenzorn@gmail.com Huang, et al. Expires January 17, 2013 [Page 9]