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资源说明：Mirror of PortMidi
# PortMidi, PortSMF, scorealign This is: - PortMidi, a cross-platform library for MIDI IO, - PortSMF, a Standard MIDI File reader/writer/data structure, - scorealign, music alignment software (audio and/or symbolic), all from the orignal designer/developer. Each of these is independent; if you just want PortMidi, you only need the portmidi/trunk subdirectory. # PortMidi ## [Full C API documentation is here.](https://rbdannenberg.github.io/portmidi/) ## Compiling and Using PortMidi Use CMake (or ccmake) to create a Makefile for Linux/BSD or a project file for Xcode or MS Visual Studio. Use make or an IDE to compile. libportmidi_s.* is a static library (recommended - fewer things can go wrong); libportmidi.* is a dynamic library. ## What's New? This repo is a copy of the PortMedia project at Sourceforge. As of September 2021, PortMidi has some changes: - added Pm_CreateVirtualInput() and Pm_CreateVirtualOutput() functions that allow applications to create named ports analogous to devices. - improvements for macOS CoreMIDI include higher data rates for devices, better handling of Unicode interface names in addition to virtual device creation. - the notion of default devices, Pm_GetDefaultInputDeviceID(), Pm_GetDefaultOutputDeviceID and the PmDefaults program have fallen into disuse and are now deprecated. - Native Interfaces for Python, Java, Go, Rust, Lua and more seem best left to individual repos, so support within this repo has been dropped. A Java interface is still here and probably usable -- let me know if you need it and/or would like to help bring it up to date. I am happy to help with, link to, or collaborate in supporting PortMidi for other languages. For up-to-date PortMidi for languages other than C/C++ found here, check with developers. As of 27 Sep 2021, this (and SourceForge) is the only repo with the features described above. # PortSMF PortSMF is a library for reading/writing/editing Standard MIDI Files. It is actually much more, with a general representation of events and updates with properties consisting of attributes and typed values. Familiar properties of pitch, time, duration, and channel are built into events and updates to make them faster to access and more compact. To my knowledge, PortSMF has the most complete and useful handling of MIDI tempo tracks. E.g., you can edit notes according to either beat or time, and you can edit tempo tracks, for example, flattening the tempo while preserving the beat alignment, preserving the real time while changing the tempo or stretching the tempo over some interval. In addition to Standard MIDI Files, PortSMF supports an ASCII representation called Allegro. PortSMF and Allegro are used for Audacity Note Tracks. # scorealign Another library and applicatioon in this repo is scorealign, which aligns audio-to-audio, audio-to-MIDI or MIDI-to-MIDI using dynamic time warping (DTW) of a computed chromagram representation. There are some added smoothing tricks to improve performance. This library is written in C and runs substantially faster than most other implementations, especially those written in MATLAB, due to the core DTW algorithm. Users should be warned that while chromagrams are robust features for alignment, they achieve robustness by operating at fairly high granularity, e.g., durations of around 100ms, which limits time precision. Other more recent algorithms can doubtless do better, but be cautious of claims, since it all depends on what assumptions you can make about the music.
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