Foundations for Reliable and Flexible Interactive Multimedia Scores

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1. Foundations for Reliable and Flexible Interactive Multimedia Scores Jaime Arias, Myriam Desainte-Catherine, Carlos Olarte, and Camilo Rueda Laboratoire Bordelais de Recherche en Informatique (LaBRI) Université de Bordeaux 5th International Conference on Mathematics and Computation in Music (MCM 2015) United Kingdom, June 2015 1 
   
2. Motivation Interactive Multimedia Scenarios • Interactive Scores† (IS) is a formalism for composing and interpreting interactive multimedia scenarios. • Some applications of IS: ◦ Live performances ◦ Museum installations ◦ Plastic art installations †A. Allombert. Aspects Temporels d’un Système de Partitions Musicales Interactives pour la Composition et l’Exécution. PhD thesis, Université de Bordeaux, 2009 Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 1/13 1/13
3. Motivation Interactive Multimedia Scenarios • Currently, IS is implemented in the software i-score†. • A Hierarchical Time Stream Petri Net (HTSPN) model represents and executes the partially ordered set of events. †Website: http://www.i-score.org/ Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 2/13 2/13
4. Motivation Interactive Multimedia Scenarios • Some applications demand two features that are not supported by the IS model†: ◦ Flexible control structures such as conditionals. ◦ Automatic verification of scenarios in order to avoid abnormal behaviors. • The specification of some behaviors could be cumbersome due to the horizontal time-line of i-score. †T. De la Hogue, P. Baltazar, M. Desainte-Catherine, J. Chao, and C. Bossut. OSSIA : Open Scenario System for Interactive Applications. In Journées d’Informatique Musicale, pages 78–84, Bourges, 2014 Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 3/13 3/13
5. This talk is about … ReactiveIS: a programming language for the specification and execution of interactive multimedia scenarios endowed with a tree-based operational semantics and a declarative interpretation in intuitionistic linear logic. Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 4/13 4/13
6. Outline ReactiveIS Syntax Program Tree State Tree Operational Semantics Logical Characterization Concluding Remarks
7. Outline ReactiveIS Syntax Program Tree State Tree Operational Semantics Logical Characterization Concluding Remarks
8. ReactiveIS Syntax ⟨score⟩ ::= ⟨structure⟩ ⟨texture⟩ ::= texture(⟨params⟩ ⟨msg⟩ ⟨msg⟩) ⟨structure⟩ ::= structure(⟨params⟩ ⟨TO-list⟩) ⟨params⟩ ::= ⟨name⟩ ⟨condition⟩ ⟨condition⟩ ⟨TO-event⟩ ::= start ⟨name⟩ | end ⟨name⟩ ⟨condition⟩ ::= wait(⟨TO-event⟩ ⟨min⟩ ⟨max⟩) | event ⟨msg⟩ | (⟨condition⟩ ∧ ⟨condition⟩) | (⟨condition⟩ ∨ ⟨condition⟩) time (s) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Texture B Texture A Structure C Structure D Texture E Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 5/13 5/13
9. ReactiveIS Syntax ... Structure C = { start.c = (Wait(End(A),5,5) & Wait(End(B),3,3)); stop.c = (Wait(End(D),0,INF) & Wait(End(E),0,INF)); Texture D = { start.c = ((Wait(Start(C),2,5) & Event("/mouse 1")) | Wait(Start(C),5,5)); stop.c = Wait(Start(D),1,1); start.msg = "/sound/1 on"; stop.msg = "/sound/1 off"; }; ... }; time (s) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Texture B Texture A Structure C Structure D Texture E Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 6/13 6/13
10. ReactiveIS Program Tree start: stop: True EndScenario Conditionals start: stop: WaitFromEnd(A,5,5) ∧ WaitFromEnd(B,3,3) WaitFromEnd(C.D,0,∞) ∧ WaitFromEnd(C.E,0,∞) Conditionals C start: stop: WaitFromStart(C,1,1) WaitFromStart(C.E,2,2) Conditionals Messages start: stop: /sound/2 on /sound/2 off E B A D Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 7/13 7/13
11. ReactiveIS State Tree start: stop: 0 ⊥ Times Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 8/13 8/13
12. ReactiveIS State Tree start: stop: 0 ⊥ Times start: stop: 1 3 Times A Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 8/13 8/13
13. ReactiveIS State Tree start: stop: 0 ⊥ Times start: stop: 3 5 Times B start: stop: 1 3 Times A Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 8/13 8/13
14. ReactiveIS State Tree start: stop: 0 ⊥ Times start: stop: 3 5 Times B start: stop: 1 3 Times A start: stop: 8 ⊥ Times C start(S,C,8) Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 8/13 8/13
15. ReactiveIS State Tree start: stop: 0 ⊥ Times start: stop: 3 5 Times B start: stop: 1 3 Times A start: stop: 8 14 Times C stop(S,C,14) Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 8/13 8/13
16. ReactiveIS Operational Semantics RSTART p ∈ canStart(S, P) ⟨P, S, I, t⟩ |= cs(n) ⟨St, O⟩I,t S −→P ⟨start(St, p, t), O ∪ {ms(n)}⟩I,t S where n = targetP(p) RSTOP p ∈ canStop(S) ⟨P, S, I, t⟩ |= ce(n) ⟨St, O⟩I,t S −→P ⟨stop(St, p, t), O ∪ {me(n)}⟩I,t S where n = targetP(p) RTIME ⟨S, ∅⟩I,t S −→∗ P ⟨S′, O⟩I,t S ̸ −→P ⟨S, t⟩ I,O =⇒P ⟨S′, t + 1⟩ Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 9/13 9/13
17. ReactiveIS Operational Semantics RSTART p ∈ canStart(S, P) ⟨P, S, I, t⟩ |= cs(n) ⟨St, O⟩I,t S −→P ⟨start(St, p, t), O ∪ {ms(n)}⟩I,t S where n = targetP(p) palive(S) = {p | p ∈ L(S) ∧ te(targetS (p)) = ⊥} 0 ⊥ 8 ⊥ 3 5 1 3 C A B palive (S) Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 9/13 9/13
18. ReactiveIS Operational Semantics RSTART p ∈ canStart(S, P) ⟨P, S, I, t⟩ |= cs(n) ⟨St, O⟩I,t S −→P ⟨start(St, p, t), O ∪ {ms(n)}⟩I,t S where n = targetP(p) palive(S) = {p | p ∈ L(S) ∧ te(targetS (p)) = ⊥} canStart(P, S) △ = {p | pparent ∈ palive(S) ∧ p ∈ Children(pparent )} \ L(S) C A B E D canStart(P, S) 0 ⊥ 8 ⊥ 3 5 1 3 C A B palive (S) Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 9/13 9/13
19. ReactiveIS Operational Semantics RSTART p ∈ canStart(S, P) ⟨P, S, I, t⟩ |= cs(n) ⟨St, O⟩I,t S −→P ⟨start(St, p, t), O ∪ {ms(n)}⟩I,t S where n = targetP(p) cs (targetP (C.E)) = WaitFromStart(C, 1, 1) ⟨P, S, I, t⟩ | = WaitFromStart(p, t1, t2) iff ∃n · n ∈ V (S) ∧ n = targetS (p) ∧ t1 ≤ t − ts (n) ≤ t2 0 ⊥ 8 ⊥ 3 5 1 3 C A B t = 9 Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 9/13 9/13
20. ReactiveIS Operational Semantics RSTOP p ∈ canStop(S) ⟨P, S, I, t⟩ |= ce(n) ⟨St, O⟩I,t S −→P ⟨stop(St, p, t), O ∪ {me(n)}⟩I,t S where n = targetP(p) canStop(S) △ = {p | p ∈ L(S) ∧ te(targetS (p)) = ⊥} = palive(S) Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 9/13 9/13
21. ReactiveIS Operational Semantics RSTART p ∈ canStart(S, P) ⟨P, S, I, t⟩ |= cs(n) ⟨St, O⟩I,t S −→P ⟨start(St, p, t), O ∪ {ms(n)}⟩I,t S where n = targetP(p) RSTOP p ∈ canStop(S) ⟨P, S, I, t⟩ |= ce(n) ⟨St, O⟩I,t S −→P ⟨stop(St, p, t), O ∪ {me(n)}⟩I,t S where n = targetP(p) RTIME ⟨S, ∅⟩I,t S −→∗ P ⟨S′, O⟩I,t S ̸ −→P ⟨S, t⟩ I,O =⇒P ⟨S′, t + 1⟩ Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 9/13 9/13
22. Outline ReactiveIS Syntax Program Tree State Tree Operational Semantics Logical Characterization Concluding Remarks
23. Logical Characterization Subexponentials in Linear Logic (SELL) Girard’s Linear Logic†: Formulas are seen as resources, e.g, c ⊗ c ̸−→ c. Subexponentials: meanings for !aF • “F holds in location a” (e.g., in a given structure) • “F holds with certain modality a” (e.g., in a time-unit t). • Subexp. are ordered in a poset. • The ordering determines the provability relation, e.g.,: !aF −→!bF iff b ⪯ a • We then have a better control of resources in proofs. 0+ 0 1+ 1 2+ 2 3+ 3 … where t is defined as t TI t.i t.o t.s.scenario t.s.A t.s.B t.s.C t.s.D t.s.E t.p TP †J. Girard. Linear logic. Theor. Comput. Sci., 50:1–102, 1987 Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 10/13 10/13
24. Logical Characterization Declarative Meaning of ReactiveIS programs We defined an encoding from ReactiveIS programs into SELL formulas. Adequacy P reaches a state s iff the sequent [[P]] −→ [[s]] is provable in SELL. This opens the possibility of reasoning about IS by using well established techniques in proof theory! We can verify properties such as: • Is it possible for the structure A and B to be played concurrently ? • Is the execution of A always preceded by an execution of B ? • Will all the structures be eventually played ? Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 11/13 11/13
25. Outline ReactiveIS Syntax Program Tree State Tree Operational Semantics Logical Characterization Concluding Remarks
26. Concluding Remarks Summary • We presented a new programming language for the specification, verification and interpretation of interactive scores. • ReactiveIS extends the full capacity of temporal organization of IS and also it allows the specification of conditionals. • The operational semantics based on labelled trees are simpler and more intuitive than the current model in HTSPN of i-score. • We presented a declarative interpretation of ReactiveIS programs as formulas in ILL with subexponentials that is adequate. Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 12/13 12/13
27. Concluding Remarks Future work • Coq for proving the correcteness of the semantics. • Front-end for the specification of properties. • Extension for loops. Arias, Desainte-Catherine, Olarte, and Rueda (LaBRI) Foundations for Reliable and Flexible Interactive Multimedia Scores 13/13 13/13
28. Thank you for your attention! jaime.arias@labri.fr
29. Foundations for Reliable and Flexible Interactive Multimedia Scores Jaime Arias, Myriam Desainte-Catherine, Carlos Olarte, and Camilo Rueda Laboratoire Bordelais de Recherche en Informatique (LaBRI) Université de Bordeaux 5th International Conference on Mathematics and Computation in Music (MCM 2015) United Kingdom, June 2015 1 
    
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