AoIP/AES67: Anatomy of a Full-Stack Implementation
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1 CURA TED BY AoIP/AES67: Anatomy of a Full-Stack Implementation Ievgen Kostiukevych IP Media Technology Architect European Broadcasting Union IP SHOWCASE THEATRE AT IBC SEPT , 2018 AOIP IP STACK ON OSI LAYERS Layer 1: 100BASE-T, 1000BASE-% (T, X, etc.) Layer 2: Ethernet Layer 3: IPv4, IGMPv2, DiffServ Layer 4: UDP Layer 5: RTP (RTSP) Layer 6: PCM Audio Layer 7: Network-aware A/D-D/A Curated by the Video Services Forum vsf.tv 1
2 AUDIO OVER IP IMPLEMENTATION ANATOMY Curated by the Video Services Forum vsf.tv 2
3 AUDIO OVER IP IMPLEMENTATION ANATOMY Audio over IP protocols are packet-based Utilize connectionless, unreliable protocol UDP Require additional protocols I.E. DiffServ to maintain reliable performance I.E. IEEE1588 to keep stable clock and synchronization I.E. IGMP to utilize network properly and efficiently Curated by the Video Services Forum vsf.tv 3
4 AUDIO OVER IP IMPLEMENTATION ANATOMY Core of all implementations PCM audio Additional functionality is required to be fully operational, configurable and user-friendly This functionality is provided by implementation and can vary from one to another How to discover devices? How to advertise streams? How to subscribe to streams? AUDIO TRANSPORT AUDIO PAYLOAD AND ENCODING SYNCHRONIZATION AND CLOCK QUALITY OF SERVICE CONNECTION MEDIUM Curated by the Video Services Forum vsf.tv 4
5 REDUNDANCY DEVICE CONTROL AND MONITORING DISCOVERY AND REGISTRATION CONNECTION MANAGEMENT SESSION DESCRIPTION AUDIO TRANSPORT AUDIO PAYLOAD AND ENCODING SYNCHRONIZATION AND CLOCK QUALITY OF SERVICE CONNECTION MEDIUM Device control and monitoring HTTP, Proprietary HTTP, Ember+ Proprietary Discovery and registration Proprietary mdns/dns-sd (Bonjour) SAP Connection management Proprietary, HTTP, IGMP RTSP, SIP, IGMP Proprietary Session description By channel number SDP Proprietary Transport RTP, IPv4 RTP, IPv4 Proprietary, IPv4 Quality of Service DiffServ/802.1pq DiffServ DiffServ Synchronization Proprietary IEEE (PTPv2) IEEE (PTPv1) Encoding/channel count PCM, L24 mono, stereo, 5.1 PCM, L16-32 Up to 64 ch. per stream PCM, L16-32 Up to 64 ch. per flow Audio payload 48 khz khz khz IP Slide concept by Merging Technologies Curated by the Video Services Forum vsf.tv 5
6 Device control and monitoring HTTP, Proprietary HTTP, Ember+ Proprietary Discovery and registration Proprietary mdns/dns-sd (Bonjour) SAP Connection management Proprietary, HTTP, IGMP RTSP, SIP, IGMP Proprietary Session description By channel number SDP Proprietary Transport RTP, IPv4 AES67 RTP, IPv4 Proprietary, IPv4 Quality of Service DiffServ/802.1pq DiffServ DiffServ IEEE IEEE Synchronization Proprietary (PTPv2) (PTPv1) Encoding PCM, L24 mono, stereo, 5.1 UNDERSTOOD HERE PCM, L16-32 Up to 64 ch. per stream PCM, L16-32 Up to 64 ch. per flow Audio payload 48 khz khz khz IP Slide concept by Merging Technologies Device control and monitoring HTTP, Proprietary HTTP, Ember+ Proprietary Discovery and registration Proprietary mdns/dns-sd (Bonjour) SAP Connection management Session description Transport Quality of Service Synchronization Encoding/channel count Audio payload IGMPv2 (multicast stream) / SIP (unicast stream) SDP (RFC 7273 for RTP clock offset announcement) RTP/AVC (RFC 3550 & 3551) over UDP over IPv4/IPv6 DiffServ: DSCP 46 (EF) - PTP, DSCP 34 (AF41) - RTP, DSCP 0 (BE) - else IEEE (PTPv2), AES-R profile is recomended PCM, L16 (for 44.1/48 khz) or L24 (for 48/96 khz), 1 to 8 channels 48 khz recommended default (44.1/96 khz are possible) IP Slide concept by Merging Technologies Curated by the Video Services Forum vsf.tv 6
7 REDUNDANCY DEVICE CONTROL AND MONITORING DISCOVERY AND REGISTRATION CONNECTION MANAGEMENT SESSION DESCRIPTION Out of scope AUDIO TRANSPORT AUDIO PAYLOAD AND ENCODING SYNCHRONIZATION AND CLOCK QUALITY OF SERVICE Covered in AES67 CONNECTION MEDIUM RAVENNA-2-SAP AES67 CONNECTION MANAGEMENT CONVERTER Curated by the Video Services Forum vsf.tv 7
8 ANEMAN IS THE FIRST CROSS PLATFORM & CROSS VENDOR AUDIO NETWORK MANAGER DEVICE CONTROL AND MONITORING Curated by the Video Services Forum vsf.tv 8
9 AUDIO OVER IP IN SMPTE ST 2110 SMPTE PROFESSIONAL MEDIA OVER MANAGED IP NETWORKS Document structure: : System Timing & Definitions : Uncompressed Active Video : Traffic Shaping and Delivery Timing for Uncompressed Active Video : PCM Digital Audio : AES3 Transparent Transport : Transport of SMPTE Ancillary Data Curated by the Video Services Forum vsf.tv 9
10 SMPTE ST : PCM DIGITAL AUDIO Defines payload format for uncompressed PCM audio Based on AES67 Introduces additional constraints SMPTE ST : ADDITIONAL CONSTRAINTS TO AES67 ST requires usage of SMPTE PTP profile AES-R (AES67 PTP Media profile) resolves this PTP setting defaultds.slaveonly=true required Media clock to RTP clock offset (Δt s ) must equal zero (a=mediaclk:direct=0) Curated by the Video Services Forum vsf.tv 10
11 SMPTE 2110: ADDITIONAL CONSTRAINTS TO AES67 Support for SIP not required Support for optional redundancy with SMPTE required Support for Channel assignment map as SDP attributes required REDUNDANCY DEVICE CONTROL AND MONITORING DISCOVERY AND REGISTRATION Covered in ST Out of scope CONNECTION MANAGEMENT SESSION DESCRIPTION AUDIO TRANSPORT AUDIO PAYLOAD AND ENCODING SYNCHRONIZATION AND CLOCK Covered in AES67 QUALITY OF SERVICE CONNECTION MEDIUM Curated by the Video Services Forum vsf.tv 11
12 IS-04 - NMOS Discovery & Registration API IS-05 - NMOS Device Connection Management API IS-06 - NMOS Network Control IS-07 - NMOS Event & Tally Curated by the Video Services Forum vsf.tv 12
13 Minimum Stack for IP endpoints necessary to build and manage a full scale facility Time and Sync PTPv2 Both SMPTE and AES profiles BMCA for multi-interface redundancy Configuration and Monitoring DHCP IP assignment Open configuration management (e.g., API, config file, SSH CLI, etc.) Open monitoring protocol (e.g., Agentbased, SNMPv3, etc.) is only the tip of the pyramid Media Transport Video SMPTE ST /21 with Wide Rx Audio SMPTE ST Level C SMPTE ST :2018 Protection Single link - e.g., UHD on 25 GbE Discovery and Connection AMWA IS-04 Discovery and Registration AMWA IS-05 Connection Management LLDP Topology discovery Security EBU R148 Tests HTTPS API calls AD, LDAP or Certificates - Authentication Widely available Production Infrastructure Strategic Programme - IBC 2018 Partially available Rarely available WHAT S NEXT?.. Curated by the Video Services Forum vsf.tv 13
14 WHAT S NEXT? Evaluate! Educate! Get your hands dirty! Get in touch! CURA TED BY Thank You Ievgen Kostiukevych, European Broadcasting Union kostiukevych@ebu.ch IP SHOWCASE THEATRE AT IBC SEPT , 2018 Curated by the Video Services Forum vsf.tv 14
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