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A common protocol for the shelf components

A common protocol for the shelf components. Johannes Wagner ( UoA ) Adapted by Alessandro Rossi (ENG). Advantages. Easy to integrate new components Components can be exchanged Feedback if component is working Output can be logged for analyses Components are compatible to each other.

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A common protocol for the shelf components

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  1. A common protocol for the shelf components Johannes Wagner (UoA) Adapted by Alessandro Rossi (ENG)

  2. Advantages • Easy to integrate new components • Components can be exchanged • Feedback if component is working • Output can be logged for analyses • Components are compatible to each other Comp A App. Comp B

  3. Open Sound Control (OSC) • Transport-independent and message-based light ware protocol to share data between multimedia devices • Similar to MIDI but more powerful • Free implementations available for all kind of systems and languages • Website: http://opensoundcontrol.org/

  4. OSC Messages • Starts with an OSC Address Pattern followed by an OSC Type Tag Stringand a corresponding number of OSC Arguments • Int32: 32-bit big-endian two's complement integer • Float32: 32-bit big-endian IEEE 754 floating point number • OSC-string: A sequence of non-null ASCII characters followed by a null • OSC-blob An int32 size count, followed by that many 8-bit bytes of arbitrary binary data

  5. Type of data

  6. Proposed Protocol • Based on UDP and OSC • Three type of messages:/strm continuously data stream/evnt event-related data including tags/text text based control messages • Each message has sender id and timestamp in order to synchronize messages • Semantic Items are wrapped as /evnt messages to interact with the Framework

  7. Specification

  8. Stream Example • Sending head position as pair of float32-values sampled at 10 fps, e.g. 0.5s of data (= 5 frames): X 20 20 14 11 10 Y 10 10 11 9 9 • Message:/strm “head_track” 2.0 10.0 2 <data> • Where <data> has 2x4x5 bytes: {40, [20 10 20 10 14 11 11 9 10 9]} • Receiver has to know data type (here: int)!

  9. Event Example • Sending speech event in interval [3.0 5.5]s • Message:/evnt “speech” 3.0 2.5 0 • Sending detected key words and detected emotion in same interval • Message:/evnt “key_words” 3.0 2.5 3 “I” 0.7 “feel” 0.4 “good” 0.9/evnt “emo_voice” 3.0 2.5 1 “happy”, 1.0

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