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Max/MSP interface to The Echo Nest's audio analysis API
License: Other
This project forked from echonest/en_analyzer
Max/MSP interface to The Echo Nest's audio analysis API
License: Other
en_analyzer~ en_analyzer~ provides an interface to access The Echo Nest's audio analysis API in Max/MSP. The object uploads the audio data in an identically-named buffer~ object to The Echo Nest's servers for analysis, then stores and outputs the analysis data in Max. Usage: In order to use en_analyzer~, you will need to register for a developer account with The Echo Nest. To do so, simply visit http://developer.echonest.com/account/register and enter your e-mail address, a username, and a password. You'll be given an API key, which will allow you to use en_analyzer~ to communicate with The Echo Nest API and retrieve audio analysis data (the analysis is done on The Echo Nest's servers). To use en_analyzer~, first put the object file (.mxo) somewhere where the Max application can find it. Usually this is done by adding the path to en_analyzer~.mxo in the "Options->File Preferences..." menu. In Max, create a new en_analyzer~ object, and use the first argument to specify the name of the buffer~ containing the audio data you'd like to analyze. You can specify your API key by passing it as the second argument to the object, or by sending en_analyzer~ a message like "api_key WHATEVER", or by entering your API key manually in the object's inspector. Sending the object an "analyze" message makes the magic happen. First, the audio data in your buffer is saved to a temporary file. en_analyzer~ checks to see if this audio data has already been analyzed by The Echo Nest, and if so it retrieves the analysis data. If no existing analysis is found, the object uploads the temporary file for analysis. You must be connected to the internet to retrieve analysis data; once the data has been retrieved and stored in the object, you can continue to use it even if you go offline until you close your patch. Depending on the speed of your connection, uploading the audio data for analysis may take a minute. When your audio data has been analyzed, the analysis data is downloaded and stored in the object, where it can be accessed by sending en_analyzer~ messages like "bar 2", "section 3", "segment 29", or "global". See the en_analyzer~ help file for more information. Contents: maxobj/ // max object, max help file, and example patch src/ // source code for max object Currently, en_analyzer~ only exists as a universal binary for OS X. Xcode and Visual Studio projects are provided as starting points. If you want to build the object yourself, you'll need the Max 5 SDK, as well as the following external libraries: - libcurl โ http://curl.haxx.se/ Open source C library to access online data. - json-c - http://oss.metaparadigm.com/json-c/ Open source C library to parse JSON. - libsndfile - http://www.mega-nerd.com/libsndfile/ Open source C library to read and write audiofiles. Support: For more information about The Echo Nest's audio analysis, see: http://developer.echonest.com/docs/v4/_static/AnalyzeDocumentation_2.2.pdf For more documentation about The Echo Nest API, see: http://developer.echonest.com/ For questions, comments, or bugs, contact: [email protected]
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