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1
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2 * VamPy is a VAMP plugin wrapper for Python Scripts.
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3
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4 WHAT IS IT FOR?
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5
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6 you can write VAMP plugins in Python which can do the same as the native C++ plugins
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7 plus more if you're using advanced Python modules.
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8
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9 you might get into VAMP development more easily this way.
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10 you can use it for prototyping your plugin before writing in C++
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11
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12
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13 LIMITATIONS:
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14
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15 this is really just a proof of concept. The implementation is not the most efficient.
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16 only tested on MacOSX, but in theory should work on other platforms with small fixes
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17 The Python C/API is not fully thread safe and correct threading is not yet implemented.
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18 (This can cause problems resulting in nasty crashes.)
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19
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20 Error checking is incomplete.
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21 You better not make a mistake in your Python script, although in most cases you can see what
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22 the problem is if you start the host (Sonic Visualiser) from the command line.
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23
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24
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25 HOW DOES IT WORK:
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26
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27 (1) Make sure you have Python installed.
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28 (2) Compile the C++ source or ask me for a binary (MacOS).
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29 (3) Copy the library in your Vamp plugin directory like any other VAMP plugins:
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30 eg. /Library/Audio/Plug-Ins/VAMP
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31 (4) Write your python plugins and copy them to the same place.
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32 (5) Each plugin must contain a single class with the same name as your script file.
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33 e.g. PyZeroCrossing.py -> calss PyZeroCrossing
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34 -Scripts with syntax errors in them are ignored.
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35 -Scripts not having the same class as the filename are ignored.
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36 -Other unknown scripts are likely to cause a nasty crash.
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37 (Don't put other python scripts in your VAMP directory.)
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38
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39
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40 WHY PYTHON?
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41
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42 Python is a general purpose high level scripting language.
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43 It is interpreted, so you don't need to compile your plugins
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44 It has very high level libraries. e.g. you can stream audio from your VamPy plugin (it works for me...)
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45 Supports functional programming
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46
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47
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48 COMPILING AND LINKING:
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49 (1) include Python.h wherever it is on your machine
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50 (2) this plugin needs to be linked against the Python binary:
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51
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52 example on on MacOSX:
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53 g++ -O2 -Wall -I. -fPIC -c -o pyvamp-main.o pyvamp-main.cpp
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54 g++ -dynamiclib -o vamp-pyvamp-plugin.dylib ./PyPlugScanner.o ./PyPlugin.o ./pyvamp-main.o sdk/vamp-sdk/libvamp-sdk.a
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55 -u _PyMac_Error /Library/Frameworks/Python.framework/Versions/2.5/Python
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56
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57 OR:
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58
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59 (3) There is a modified Makefile from the VAMP-SDK that compiles this plugin by default.
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60
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61
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62 TODO: needs more complete error checking
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63 needs correct implementation of Python threading
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64 more efficient data conversion using the buffering interface or ctypes
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65 VAMP 'programs' not implemented
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66 support multiple classes per script in scanner
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67 ensure proper cleanup, (host do a good job though)
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68
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69
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