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Processing Sound and Music Description Data Using Openmusic

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Processing Sound and Music Description Data Using Openmusic PROCESSING SOUND AND MUSIC DESCRIPTION DATA USING OPENMUSIC Jean Bresson, Carlos Agon IRCAM – CNRS UMR STMS Paris, France fbresson,[email protected] ABSTRACT graphs corresponding to functional expressions. The lan- guage provides a set of graphical control structures, such as This paper deals with the processing and manipulation of iterations and conditional controls, as well as the possibility music and sound description data using functional programs to carry out other programming concepts like abstraction, in the OpenMusic visual programming environment. We go higher-order functions or recursion [4]. through several general features and present some toolkits OM includes specialized functions and data structures created in this environment for the manipulation of different designed for musical applications. The different musical or data formats (audio, MIDI, SDIF). extra-musical objects are represented by classes (as meant by object-oriented programming) and used in the visual 1. INTRODUCTION programs by means of factory boxes, i.e. boxes generating instances of these classes and allowing to access their dif- Musical information processing often requires manipulating ferent attributes (called slots). large musical or sound description data bases. Ordering, Compared to most existing visual programming envi- sorting, renaming files, automatic indexing, contents brows- ronments, OM has the particularity to run a demand-driven ing or transformations are basic operations in compositional, execution model. In this model, the user triggers execution analytical, or other experimental applications. by evaluating a box somewhere in the visual program graph, Visual music programming environments make it possi- which recursively evaluates the upstream connected boxes ble to define specialized and personalized programs and to and returns a value. This model is very close (semanti- adapt such sound or music description processing to specific cally equivalent) to the evaluation of functional expressions aims in their respective domains. Real-time music/sound in Lisp. It also provides time-independent conception of processing environments such as Max/MSP or PureData [5] programs and proved to be a relevant model for formal are commonly used for this purpose. They provide conve- music composition and generation of complex and struc- nient interactive features and efficient realtime buffering and tured musical data. rendering of audio or other music description data. In this paper, we try to show how similar applications 3. FUNCTIONAL BATCH PROCESSING IN OM can be performed in OpenMusic (OM) [1] emphasizing some related features and specificities of this computer-aided In order to introduce our subject and emphasize some composition environment. OM provides a set of predefined possibilities provided by this environment, we present an structures allowing to perform complex iterative processes example of how OM visual programming can be used for on musical data in a visual and symbolic context. Special- the design of automated audio file analysis and processing. ized toolkits allow to perform these processes with music Let us first consider the case of a single sound file to be description data using standard formats. processed. Figure 1 shows an OM patch performing suc- cessive operations using sound analysis tools available in 2. OM: A VISUAL PROGRAMMING LANGUAGE OM [2]: 1) Analysis of the sound (sound object, top of the figure) with a fundamental frequency estimation (external OpenMusic (OM) is a visual programming environment call to the sound analysis kernel pm2). 2) Storage of the based on the Common Lisp language. Programs are created analysis results as a temporary SDIF file (SDIFFile object). in patch editors, where the user/programmer assembles and 3) Extraction of the frequency estimation data (“1FQ0”) from connects functional units represented by boxes. Basically, the SDIF file. 4) Determination of a pitch value (e.g. in this OM boxes are function calls (Lisp functions or user-defined example, the mean of all estimated frequency values – 186 functions), and the OM patches are more or less complex Hz). 5) Conversion of the pitch value (frequency in Hz) to 546 Various batch processing can be derived from our exam- ple procedure. In Figure 2, it is applied successively to a list of files contained in a given directory. The program from Figure 1 is now embedded as an abstraction in a patch box, which has one input corresponding to the sound to be ana- lyzed and saved with the appropriate name. This patch box is used in association with the mapcar box, a Lisp function applying another function to the successive elements of a list. The function om-directory returns the list of all the files present in a given directory. The mapcar call will therefore trigger the analysis and renaming of each one of these files. Figure 2. Applying the procedure to the files in a directory. The process in Figure 2 is known as higher-order pro- gramming: by setting the auto-rename box to a specific mode (‘lambda’ – see little l icon on the patch box), its con- tent is compiled and returned as a function (lexical closure) to the mapcar box: mapcar is a higher-order function accepting functions as parameters. It is therefore possible to perform the same iterative process with other functions or patches, by simply connecting them instead of the current one. Other extensions can be implemented: We could now suppose that our initial sounds are melodic sounds, which should first be segmented in “notes” and then processed as previously. This can be done with preliminary transient detection and segmentation of the initial sound file (also available in OM), and creating other iterations where each segment wound be subjected to pitch analysis. The omloop (a patch, i.e. a visual program or abstraction, with spe- cific features adapted to the creation of iterative processes— Figure 1. Example of sound file processing in OM: copy equivalent to the Lisp loop statement) would be for instance and rename a sound file after its inner estimated pitch. This an appropriate tool for this purpose. Further on, this new patch will be referred as auto-rename in the next figures. process could also be embedded in a directory iteration, like in Figure 2. The resulting visual program would then build a sound bank of single pitch samples out of a melodic sound a symbolic (MIDI) value (5410 midicents in the example, directory. i.e. F#2 + 10 midicents) and then to a textual name (e.g. “F#2+10”). 6) Renaming and saving the sound file after the 4. ENHANCING INTERACTION estimated note value (e.g. “∼/mysoundfiles/ F#2+10.aiff”). Visual programs such as the one in Figure 1 can be In order to enhance the interaction over the visual program embedded in abstractions, i.e. autonomous procedures or design and execution, a set of special boxes (called dialog- functional elements usable in other programs, where they item boxes) have been created, which correspond to standard communicate by argument passing through some inputs and user interface dialog-items connected to the boxes and com- outputs. These abstractions are represented by “patch” boxes, ponents of the OM patches. The dialog-item boxes include that is, they are patches used as functions in higher-level simple text input and display, check boxes, buttons, pop-up patches. menus, multiple-choice lists, sliders, etc. (see Figure 3). 547 A number of OM functions allow to process and convert musical objects and MIDI structures. Eventually the MIDI events sequences can also be stored and saved as MIDI files. Wide ranges of algorithms for the processing and generation of complex MIDI event sequences can therefore be imple- mented graphically and interactively, using all the available features of the visual programming language. The function get-midievents, for instance, receives an object (e.g. a MIDI file, one of the aforementioned MIDI classes, or traditional musical objects like chords, voices, etc.) and returns a list of MIDI events (instances of the class MIDIEvent) corresponding to this object or to its closest description using MIDI events. The higher-order program- ming features can be used here again and allow for a personalized processing: An optional input parameter of get-midievents allows one to specify a function designed to process MIDIEvents and determine whether they should be considered or not in the conversion or transfer. That is, the behaviour of get-midievents can be let as default or special- ized by the user. A set of predefined filtering functions are provided, e.g. test-date, test-type, test-channel etc., which Figure 3. Example of use of some dialog-item boxes in will allow to select events in a given time interval or, respec- OM patches: pop-up-menu (top—used to select a file among tively, of a given type or a given channel, but more complex the contents of a directory), check-box (middle), button filtering processes can be defined by the user as well (in Lisp (bottom—triggers the evaluation of the sound box and the or as visual programs—see Figure 4). global visual program execution). 5. STANDARD FORMATS TOOLKITS In the next sections we describe specialized toolkits dedicated to the manipulation of musical data using standard formats, and how they can be used for devising processing algorithms on this data. 5.1. MIDI Although several new formats tend to propose more complete representations, MIDI is still one of the most wide- spread platform for the interchange and storage of “symbolic” musical data. A significant amount of informa- tion can be stored in MIDI files or transferred through MIDI Figure 4. Filtering MIDI events by user-defined process. streams, such as program changes, continuous controllers, The patch midi-event-filter is used as the test function for tempo, textual data, and so forth. get-midievents. In OM, MIDI data can be manipulated thanks to a com- plete toolkit of classes and specialized functions, allowing users to personalize its processing and transfers in parti- 5.2.
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