Kiss-Box S16 RTP-MIDI Driver
KISS is an acronym for “Keep It Simple, Stupid” as a design principle noted by the KissBox is one of the frontrunners when it comes to transporting the Midi Missing: S The concept is based on the use of the KissBox RTP-MIDI OEM board . It's easy to imagine a box with 16 physical MIDI ports that transforms. RTP-MIDI (also known as AppleMIDI) is a protocol to transport MIDI messages within RTP . KissBox produces an RTP-MIDI OEM module, an external communication processor board, which connects over an SPI bus link. . bits encoding of USB MIDI Class can represent up to 16 endpoints using the Cable Identifier field.
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Kiss-Box S16 RTP-MIDI Driver
Ethernet has become the standard transport method for a wide variety of protocols.
It has found its way from the office environment in to many other areas where low-cost and high reliability networking is required. Within the entertainment industry we see a growing trend in using the Ethernet as the preferred infrastructure, more and more control systems are evolving into network based distributed systems.
Using our Transceiver solutions can greatly simplify the control protocol handling in your system. The compensation mechanism described in RF uses a relative timestamp system, based on the MIDI deltatime, as described in . Kiss-Box S16 RTP-MIDI
MIDIbox goes RTP-MIDI...
RFC gives some examples based on an audio sampling clock, in order Kiss-Box S16 RTP-MIDI get a sample accurate timestamping of MIDI events. The timing accuracy of all MIDI events is then microseconds for these implementations.
Sender and receiver clocks are synchronized when the session is initiated, and they are Kiss-Box S16 RTP-MIDI synchronized during the whole session period by the regular synchronization cycles, controlled by the session initiators. This mechanism has the capability to compensate for any latency, from a few hundreds of microseconds, as seen on LAN applications, to seconds.
It can compensate for the latency introduced by the Internet for example, allowing real-time execution of music pieces. This mechanism is however mainly designed for pre-recorded MIDI streams, like the one coming from Kiss-Box S16 RTP-MIDI sequencer track.
KissBox The Network Solution
With such usecase, the latency compensation mechanism described previously can not be used. The latency which can be obtained is then directly related to the different networking components involved in the communication path between the RTP-MIDI devices: In most cases, the latency comes directly from the thread latency which can be obtained on a given operating system, typically ms max on Windows and Mac Kiss-Box S16 RTP-MIDI systems.
Systems with real-time kernel can achieve much better results, down to microseconds. This time can be considered as constant, whatever the communication channel MIDI 1. Kiss-Box S16 RTP-MIDI stack processing time[ edit ] IP stack processing time is the most critical one, since the communication process goes under operating system control. This applies to any communication protocol, IP Kiss-Box S16 RTP-MIDI or not, since most operating systems, including Windows, Mac OS or Linux, do not allow direct access to the Ethernet adapter.
In particular, a common mistake is to Kiss-Box S16 RTP-MIDI "raw sockets" with "direct access to network"; sockets being the entry point to send and receive data over network in most operating systems. A "raw socket" is a socket which allows an application to send any packet using any protocol.
- RTP-MIDI - Wikipedia
- MIDIbox goes RTP-MIDI - Design Concepts - MIDIbox Forum
- The KISS Principle
The application is Kiss-Box S16 RTP-MIDI responsible to build the telegram following given protocol rules, while "direct access" would require system-level access which is restricted to the operating system kernel. A packet sent using a raw socket can then be delayed by the operating system if the network adapter is currently being used by another application.
Thus, an IP packet can be sent to the network before a packet related to a raw socket. Technically speaking, access to a given network card is controlled by "semaphores". However, Apple's implementation solved this issue in an elegant manner, using the session control protocol. The ARP sequence then takes place during the session initiation sequence. With modern processors, this preparation is extremely fast and takes only a few microseconds, which Kiss-Box S16 RTP-MIDI negligible compared to the application latency itself.
As described before, once prepared, Kiss-Box S16 RTP-MIDI RTP-MIDI packet can only be delayed when it tries to reach the network adapter if the adapter is already transmitting another packet, whether the socket is an IP Kiss-Box S16 RTP-MIDI or a "raw" Kiss-Box S16 RTP-MIDI. However, the latency introduced at this level is generally extremely low since the driver threads in charge of the network adapters have very high priority.
Moreover, most network adapters have FIFO buffers at the hardware level, so the packets can be stored for immediate transmission in the network adapter itself without needing the driver thread to be executed first.
A method to help keep the latency related to "adapter access competition" as low as possible is to reserve the network adapter for MIDI communication only, and use a different network adapter for other network usages like file Kiss-Box S16 RTP-MIDI or Internet browsing. Network components routing time[ edit ] The different components used to transmit Ethernet packets between the computers, whatever the protocols being used, introduce latency too.
All modern network switches use the "store and forward" technology, in which packets are stored in the switch before they are sent to the next switch. However, the switching times are most often negligible.
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A complex network with 10 switches on a given path introduces then a latency Kiss-Box S16 RTP-MIDI 51 microseconds. The latency is however directly related to the network Kiss-Box S16 RTP-MIDI itself, since the switches will delay a packet until the previous one is transmitted. As said in the previous section, one solution to limit the latency introduced by the network components is to use separate networks.
However, this is far less critical for network components than for network adapters in computers.
Expected latency for real-time applications[ edit ] As it can be seen, the exact latency obtained for RTP-MIDI link depends on many parameters, most of them being related to the operating systems themselves. Measurements made by the different RTP-MIDI actors give latency times from a few hundreds of microseconds for embedded systems using real-time operating systems, up to Kiss-Box S16 RTP-MIDI milliseconds when computers running general purpose operating systems are involved.
Latency enhancement sub millisecond latency [ edit ] Kiss-Box S16 RTP-MIDI AES started a working group named SCH  in in order to demonstrate the capability of using RTP payloads in IP networks for very low latency applications.
The draft proposal issued by the group in May Kiss-Box S16 RTP-MIDI that it is possible to achieve RTP streaming for live applications, with a latency value as low as microseconds.