Add Audio Stems panel with alt-audio-tracks integration and HTDemucs persistence

README.txt

@@ -21,6 +21,11 @@ XLIGHTS/NUTCRACKER RELEASE NOTES
     -change (dkulp)             Render engine cleanup: removed the main-thread effect render queue and all the
                                 wx CallAfter / drain plumbing that supported it. No effect now needs main-thread
                                 dispatch.
+    -enh (charlie)              Audio Stems panel: collapsible row of per-stem mini-waveforms below the main
+                                waveform with import/rename/recolor/reorder, S (solo) button per row, aubio-based
+                                onset → timing track generation, and unified storage with upstream alternate audio
+                                tracks (stems are visible to VU Meter and Value Curve bindings, alt tracks added via
+                                Sequence Settings show in the panel, HTDemucs stems persist to disk as alt tracks).
 
 2026.07  April 28, 2026
     -enh (MrPierreB)            Add node animation playback to SubModels dialog.

dependencies/aubio/src/aubio.h

@@ -0,0 +1,233 @@
+/*
+  Copyright (C) 2003-2015 Paul Brossier <piem@aubio.org>
+
+  This file is part of aubio.
+
+  aubio is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  aubio is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+/** \mainpage
+
+  \section introduction Introduction
+
+  aubio is a library to extract annotations from audio signals: it provides a
+  set of functions that take an input audio signal, and output pitch estimates,
+  attack times (onset), beat location estimates, and other annotation tasks.
+
+  \section basics Basics
+
+  All object structures in aubio share the same function prefixes and suffixes:
+
+    - \p new_aubio_foo creates the object \p foo
+    - \p aubio_foo_do executes the object \p foo
+    - \p del_aubio_foo destroys the object \p foo
+
+  All memory allocation and deallocation take place in the \p new_ and \p del_
+  functions. Optionally, more than one \p _do methods are available.
+  Additional parameters can be adjusted and observed using:
+
+    - \p aubio_foo_get_param, getter function, gets the value of a parameter
+    - \p aubio_foo_set_param, setter function, changes the value of a parameter
+
+  Unless specified in its documentation, no memory operations take place in the
+  getter functions. However, memory resizing can take place in setter
+  functions.
+
+  \subsection vectors Vectors
+
+  Two basic structures are being used in aubio: ::fvec_t and ::cvec_t. The
+  ::fvec_t structures are used to store vectors of floating pointer number.
+  ::cvec_t are used to store complex number, as two vectors of norm and phase
+  elements.
+
+  Additionally, the ::lvec_t structure can be used to store floating point
+  numbers in double precision. They are mostly used to store filter
+  coefficients, to avoid instability.
+
+  \subsection objects Available objects
+
+  Here is a list of some of the most common objects for aubio:
+
+  \code
+
+  // fast Fourier transform (FFT)
+  aubio_fft_t *fft = new_aubio_fft (winsize);
+  // phase vocoder
+  aubio_pvoc_t *pv = new_aubio_pvoc (winsize, stepsize);
+  // onset detection
+  aubio_onset_t *onset = new_aubio_onset (method, winsize, stepsize, samplerate);
+  // pitch detection
+  aubio_pitch_t *pitch = new_aubio_pitch (method, winsize, stepsize, samplerate);
+  // beat tracking
+  aubio_tempo_t *tempo = new_aubio_tempo (method, winsize, stepsize, samplerate);
+
+  \endcode
+
+  See the <a href="globals_type.html">list of typedefs</a> for a complete list.
+
+  \subsection example Example
+
+  Here is a simple example that creates an A-Weighting filter and applies it to a
+  vector.
+
+  \code
+
+  // set window size, and sampling rate
+  uint_t winsize = 1024, sr = 44100;
+  // create a vector
+  fvec_t *this_buffer = new_fvec (winsize);
+  // create the a-weighting filter
+  aubio_filter_t *this_filter = new_aubio_filter_a_weighting (sr);
+
+  while (running) {
+    // here some code to put some data in this_buffer
+    // ...
+
+    // apply the filter, in place
+    aubio_filter_do (this_filter, this_buffer);
+
+    // here some code to get some data from this_buffer
+    // ...
+  }
+
+  // and free the structures
+  del_aubio_filter (this_filter);
+  del_fvec (this_buffer);
+
+  \endcode
+
+  Several examples of C programs are available in the \p examples/ and \p tests/src
+  directories of the source tree.
+
+  Some examples:
+  - @ref spectral/test-fft.c
+  - @ref spectral/test-phasevoc.c
+  - @ref onset/test-onset.c
+  - @ref pitch/test-pitch.c
+  - @ref tempo/test-tempo.c
+  - @ref test-fvec.c
+  - @ref test-cvec.c
+
+  \subsection unstable_api Unstable API
+
+  Several more functions are available and used within aubio, but not
+  documented here, either because they are not considered useful to the user,
+  or because they may need to be changed in the future. However, they can still
+  be used by defining AUBIO_UNSTABLE to 1 before including the aubio header:
+
+  \code
+  #define AUBIO_UNSTABLE 1
+  #include <aubio/aubio.h>
+  \endcode
+
+  Future versions of aubio could break API compatibility with these functions
+  without warning. If you choose to use functions in AUBIO_UNSTABLE, you are on
+  your own.
+
+  \section download Download
+
+  Latest versions, further documentation, examples, wiki, and mailing lists can
+  be found at https://aubio.org .
+
+ */
+
+#ifndef AUBIO_H
+#define AUBIO_H
+
+/** @file aubio.h Global aubio include file.
+
+  You will want to include this file as:
+
+  @code
+    #include <aubio/aubio.h>
+  @endcode
+
+  To access headers with unstable prototypes, use:
+
+  @code
+    #define AUBIO_UNSTABLE 1
+    #include <aubio/aubio.h>
+  @endcode
+
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* in this order */
+#include "types.h"
+#include "fvec.h"
+#include "cvec.h"
+#include "lvec.h"
+#include "fmat.h"
+#include "musicutils.h"
+#include "vecutils.h"
+#include "temporal/resampler.h"
+#include "temporal/filter.h"
+#include "temporal/biquad.h"
+#include "temporal/a_weighting.h"
+#include "temporal/c_weighting.h"
+#include "spectral/fft.h"
+#include "spectral/dct.h"
+#include "spectral/phasevoc.h"
+#include "spectral/filterbank.h"
+#include "spectral/filterbank_mel.h"
+#include "spectral/mfcc.h"
+#include "spectral/specdesc.h"
+#include "spectral/awhitening.h"
+#include "spectral/tss.h"
+#include "pitch/pitch.h"
+#include "onset/onset.h"
+#include "tempo/tempo.h"
+#include "notes/notes.h"
+#include "io/source.h"
+#include "io/sink.h"
+#include "synth/sampler.h"
+#include "synth/wavetable.h"
+#include "utils/parameter.h"
+#include "utils/log.h"
+
+#if AUBIO_UNSTABLE
+#include "mathutils.h"
+#include "io/source_sndfile.h"
+#include "io/source_apple_audio.h"
+#include "io/source_avcodec.h"
+#include "io/source_wavread.h"
+#include "io/sink_sndfile.h"
+#include "io/sink_apple_audio.h"
+#include "io/sink_wavwrite.h"
+#include "io/audio_unit.h"
+#include "onset/peakpicker.h"
+#include "pitch/pitchmcomb.h"
+#include "pitch/pitchyin.h"
+#include "pitch/pitchyinfft.h"
+#include "pitch/pitchyinfast.h"
+#include "pitch/pitchschmitt.h"
+#include "pitch/pitchfcomb.h"
+#include "pitch/pitchspecacf.h"
+#include "tempo/beattracking.h"
+#include "effects/pitchshift.h"
+#include "effects/timestretch.h"
+#include "utils/scale.h"
+#include "utils/hist.h"
+#endif
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif