Onset detection and save

.github/workflows/coverage.yml

@@ -32,7 +32,7 @@ jobs:
         run: sudo apt-get install -y lcov
 
       - name: Configure
-        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} -DVELOCILOOPS_COVERAGE=ON
+        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} -DVELOCILOOPS_ENABLE_COVERAGE=ON
 
       - name: Build
         run: cmake --build build --parallel $(nproc)
@@ -44,7 +44,7 @@ jobs:
         run: |
           lcov -c -d build \
             --ignore-errors mismatch,unused,inconsistent,unsupported \
-            --include "*/src/*" \
+            --include "*/src/*.cpp" \
             -o build/coverage.info
 
       - name: Check Coverage

.github/workflows/fuzz.yml

@@ -34,19 +34,20 @@ jobs:
             -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} \
             -DCMAKE_C_COMPILER=clang \
             -DCMAKE_CXX_COMPILER=clang++ \
-            -DVELOCILOOPS_SANITIZERS=ON \
+            -DVELOCILOOPS_ENABLE_SANITIZERS=ON \
             -DVELOCILOOPS_ENABLE_FUZZING=ON
 
       - name: Build
         run: cmake --build build-fuzz --parallel $(nproc) --target velociloops_fuzzer
 
       - name: Fuzz
         run: |
-          ./build-fuzz/tests/velociloops_fuzzer \
-            tests/fuzz/ \
+          ./build-fuzz/fuzz/velociloops_fuzzer \
             -max_total_time=60 \
             -max_len=980128 \
             -rss_limit_mb=512 \
+            -entropic=0 \
+            fuzz/data/ \
             tests/data/
         env:
           ASAN_OPTIONS: halt_on_error=1:detect_leaks=0

.github/workflows/sanitizers.yml

@@ -30,13 +30,13 @@ jobs:
         run: |
           cmake -S . -B build \
             -DCMAKE_BUILD_TYPE=Debug \
-            -DVELOCILOOPS_SANITIZERS=ON
+            -DVELOCILOOPS_ENABLE_SANITIZERS=ON
 
       - name: Build
-        run: cmake --build build --parallel
+        run: cmake --build build --parallel $(nproc)
 
       - name: Test
-        run: ctest --test-dir build --output-on-failure
+        run: ctest --test-dir build --parallel $(nproc) --output-on-failure
         env:
           ASAN_OPTIONS: halt_on_error=1:detect_leaks=1
           UBSAN_OPTIONS: halt_on_error=1:print_stacktrace=1

.github/workflows/tests.yml

@@ -41,7 +41,7 @@ jobs:
         run: cmake -S . -B build -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }}
 
       - name: Build
-        run: cmake --build build --config ${{ env.BUILD_TYPE }}
+        run: cmake --build build --config ${{ env.BUILD_TYPE }} --parallel $(nproc)
 
       - name: Test
-        run: ctest --test-dir build --build-config ${{ env.BUILD_TYPE }} --output-on-failure
+        run: ctest --test-dir build --build-config ${{ env.BUILD_TYPE }} --parallel $(nproc) --output-on-failure

.gitignore

@@ -42,6 +42,7 @@
 
 # Folders
 .venv/
+.gitnexus/
 _build/
 build*/
 parking/

CMakeLists.txt

@@ -12,47 +12,51 @@ option(VELOCILOOPS_ENABLE_SHARED "Build shared library" ON)
 option(VELOCILOOPS_ENABLE_TESTING "Build tests" ON)
 option(VELOCILOOPS_ENABLE_DEMO "Build demo" ON)
 
+cmake_dependent_option(VELOCILOOPS_ENABLE_COVERAGE "Enable coverage" OFF
+    "VELOCILOOPS_ENABLE_TESTING;LCOV_EXECUTABLE;GENHTML_EXECUTABLE" OFF)
+
+cmake_dependent_option(VELOCILOOPS_ENABLE_FUZZING
+    "Build libFuzzer target (requires Clang with -fsanitize=fuzzer)" OFF
+    "VELOCILOOPS_ENABLE_TESTING" OFF)
+
+cmake_dependent_option(VELOCILOOPS_ENABLE_SANITIZERS
+    "Enable AddressSanitizer + UBSan (requires Clang or GCC)" OFF
+    "VELOCILOOPS_ENABLE_TESTING" OFF)
+
 if (VELOCILOOPS_ENABLE_STATIC)
-    add_library(velociloops_static STATIC src/velociloops.cpp)
+    add_library(velociloops_static STATIC src/velociloops.cpp src/fft8g.h)
     target_include_directories(velociloops_static PUBLIC include)
     target_compile_features(velociloops_static PRIVATE cxx_std_17)
 endif()
 
 if (VELOCILOOPS_ENABLE_SHARED)
-    add_library(velociloops_shared SHARED src/velociloops.cpp)
+    add_library(velociloops_shared SHARED src/velociloops.cpp src/fft8g.h)
     target_include_directories(velociloops_shared PUBLIC include)
     target_compile_features(velociloops_shared PRIVATE cxx_std_17)
 endif()
 
 if (PROJECT_IS_TOP_LEVEL)
     include(CTest)
     if (VELOCILOOPS_ENABLE_TESTING)
-        cmake_dependent_option(VELOCILOOPS_COVERAGE "Enable coverage" OFF
-            "VELOCILOOPS_ENABLE_TESTING;LCOV_EXECUTABLE;GENHTML_EXECUTABLE" OFF)
-
-        if (VELOCILOOPS_COVERAGE)
+        if (VELOCILOOPS_ENABLE_COVERAGE)
             target_compile_options(velociloops_static PRIVATE --coverage)
             target_link_options(velociloops_static INTERFACE --coverage)
         endif()
 
-        cmake_dependent_option(VELOCILOOPS_SANITIZERS
-            "Enable AddressSanitizer + UBSan (requires Clang or GCC)" OFF
-            "VELOCILOOPS_ENABLE_TESTING" OFF)
-
-        if (VELOCILOOPS_SANITIZERS)
+        if (VELOCILOOPS_ENABLE_SANITIZERS)
             target_compile_options(velociloops_static PRIVATE
                 -fsanitize=address,undefined -fno-omit-frame-pointer -g)
             target_link_options(velociloops_static INTERFACE
                 -fsanitize=address,undefined)
         endif()
 
-        cmake_dependent_option(VELOCILOOPS_ENABLE_FUZZING
-            "Build libFuzzer target (requires Clang with -fsanitize=fuzzer)" OFF
-            "VELOCILOOPS_ENABLE_TESTING" OFF)
-
         add_subdirectory(tests)
     endif()
 
+    if (VELOCILOOPS_ENABLE_FUZZING)
+        add_subdirectory(fuzz)
+    endif()
+
     if (VELOCILOOPS_ENABLE_DEMO)
         add_subdirectory(demo)
     endif()

README.md

@@ -48,6 +48,7 @@ exposes per-slice float audio, and supports a full read/write round-trip.
 ### Authoring and mutation
 
 - **Create new RX2 files** — Build mono or stereo loops from caller-supplied float slices.
+- **SuperFlux auto-slicing** — Build a save-ready loop from full-loop mono or stereo float PCM using onset detection.
 - **Set file and creator metadata before writing** — Configure tempo, original tempo, time signature, bit depth, transient settings, and creator fields before adding audio.
 - **Append and remove slices** — Add slices by PPQ position and remove existing slices by index.
 - **Round-trip by re-encoding** — Decode existing slices to float audio, mutate metadata/slices, and save a fresh RX2 file.
@@ -80,6 +81,12 @@ executable.
 
 Extracts every slice as a WAV file and performs a save/reload round-trip check.
 
+```sh
+./build/demo/velociloops tests/data/120Stereo.wav out/120Stereo_auto.rx2 120
+```
+
+Auto-slices a WAV file with SuperFlux onset detection and writes a REX2 file.
+
 ### Embed in your project
 
 ```cmake