LoopAuditioneer
LoopAuditioneer is a software for evaluating loops and cues existing in wav file metadata as well as generally being helpful in sample preparation for usage in virtual pipe organs, like the GrandOrgue software.
Features
- Load .wav sample files and display existing cue and smpl metadata
- See the waveform with loops and cues drawn upon it
- Zoom in/out on amplitude of the waveform
- Play back the loops and cues for aural evaluation
- Choose which loops/cues to keep when saved or saved as...
- Enjoy bit true data handling, even if header is re-written due to changes, there will be no degrading of the audio data unless actual changes are made to the audio data itself
- Edit/create cue (release marker) position directly on the waveform with automatic adjustment to find the position with lowest RMS power closest to where the user clicked
- Edit/create new loops manually
- Autosearch for good, natural loop points with a high degree of configurational control over the loopsearching process
- Perform crossfades of loops when it's difficult to find natural seamless ones
- View the waveform at the looppoints in detail
- Batch process all .wav files in any source directory with freely selectable target directory to either overwrite the existing files or create copies of them
- Autodetect pitch of sample and store information in file
- Edit dwMIDIUnityNote and dwMIDIPitchFraction
- View the FFT power spectrum and set pitch from chosen peak
- Perform cut and fade in/out both in single file mode and in batch mode
- Trim away unused wav data from looped samples in batch mode
- Export audio data from cue marker as separate release in batch mode
- Export audio data to after last loop as separate attack in batch mode
Credit to others code
The only code in the src/ directory that's not written by the author is the FFT.h and FFT.cpp files that are slightly modified versions of those in Audacity source code. The pitch detection algorithm for the time domain is taken and adapted from a discussion on the GrandOrgue mailing list.
Other external libraries that LoopAuditioneer is dependant on and use as submodules are Libsndfile and Libsamplerate both originally written by Erik de Castro Lopo. Libsndfile, is provided from a fork of the official version to allow exact reading and writing of pitch fraction metadata information. RtAudio, by Gary P. Scavone is used for audio output.
Graphical credits
In the resources/free-pixel-icons/ directory resides the icons used by the program for the toolbar. The complete set is available at http://www.small-icons.com/packs/24x24-free-pixel-icons.htm and distributed under a Creative Commons 3.0 license. The icons in resources/icons are created by the author (Lars Palo) except for the macOS adaptation which was done by vpoguru.
Building
Basic compilation instructions are available in the BUILD.md file. At the moment the program is developed and mostly tested under Linux (Ubuntu 20.04) 64 bit. The Windows binaries are produced by cross-compilation with x86_64-w64-mingw32. Since june 2024 builds for macOS, both Intel and arm64 are also available. All releases of this software here on Github are created on action runners on Github.
LoopAuditioneer requires wxWidgets 3.0+, available at http://www.wxwidgets.org/. The repository unicode version of wxWidgets that Ubuntu offer should work as well. Other build dependencies are documented in the BUILD.md file. Both macOS and Windows builds have wxWidgets included in them which means that they need nothing extra installed in order to run.
Help and documentation
At https://loopauditioneer.sourceforge.io/userguide.html older official documentation on how to use the software can be found. Inside the software the help can be consulted for additional insights.