Initial extraction: C++ MixerEngine standalone daemon

Extracted from op-pedal mixer-engine branch. Core components: - MixerEngine / MixerChannelStrip / MixerBus — cleaned of LV2/Pedalboard/IHost/MidiMapper deps - MixerControlServer — Unix domain socket JSON control interface - main.cpp — JACK audio I/O client with headless fallback - CMake build — auto-fetches nlohmann/json, links JACK - 9 core tests passing Architecture: JACK ports → MixerEngine::process() → JACK ports, controlled via Unix socket JSON commands.
2026-06-23 12:17:45 -04:00
commit a5423b7f55
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+cmake_minimum_required(VERSION 3.16)
+project(oplabs-mixer-daemon
+    VERSION 1.0.0
+    DESCRIPTION "OPLabs Standalone Mixer Engine Daemon"
+    LANGUAGES CXX
+)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
+# ---------------------------------------------------------------------------
+# Dependencies
+# ---------------------------------------------------------------------------
+
+# JACK Audio Connection Kit
+find_package(PkgConfig QUIET)
+if(PkgConfig_FOUND)
+    pkg_check_modules(JACK jack)
+endif()
+if(NOT JACK_FOUND)
+    find_package(Jack QUIET)
+endif()
+
+# nlohmann/json (single-header, fetched automatically)
+include(FetchContent)
+FetchContent_Declare(
+    nlohmann_json
+    GIT_REPOSITORY https://github.com/nlohmann/json.git
+    GIT_TAG v3.11.3
+)
+FetchContent_MakeAvailable(nlohmann_json)
+
+# ---------------------------------------------------------------------------
+# Mixer library (static)
+# ---------------------------------------------------------------------------
+set(MIXER_SOURCES
+    src/MixerBus.cpp
+    src/MixerChannelStrip.cpp
+    src/MixerEngine.cpp
+)
+
+set(MIXER_HEADERS
+    include/mixer/Types.hpp
+    include/mixer/MixerBus.hpp
+    include/mixer/MixerChannelStrip.hpp
+    include/mixer/MixerEngine.hpp
+)
+
+add_library(mixer STATIC ${MIXER_SOURCES})
+target_include_directories(mixer PUBLIC include)
+target_link_libraries(mixer PUBLIC nlohmann_json::nlohmann_json)
+target_compile_options(mixer PRIVATE -Wall -Wextra -Wpedantic)
+
+# ---------------------------------------------------------------------------
+# Control server library (depends on mixer + JACK)
+# ---------------------------------------------------------------------------
+add_library(mixer-control ${MIXER_SOURCES} src/MixerControlServer.cpp)
+target_include_directories(mixer-control PUBLIC include)
+target_link_libraries(mixer-control PUBLIC nlohmann_json::nlohmann_json)
+target_compile_options(mixer-control PRIVATE -Wall -Wextra -Wpedantic)
+
+# ---------------------------------------------------------------------------
+# Daemon executable
+# ---------------------------------------------------------------------------
+add_executable(mixer-daemon src/main.cpp)
+target_link_libraries(mixer-daemon
+    mixer-control
+    nlohmann_json::nlohmann_json
+)
+if(JACK_FOUND)
+    target_link_libraries(mixer-daemon ${JACK_LIBRARIES})
+    target_include_directories(mixer-daemon PRIVATE ${JACK_INCLUDE_DIRS})
+    target_compile_options(mixer-daemon PRIVATE ${JACK_CFLAGS_OTHER})
+    target_compile_definitions(mixer-daemon PRIVATE HAS_JACK=1)
+    message(STATUS "JACK found: ${JACK_LIBRARIES}")
+else()
+    message(WARNING "JACK not found — building without JACK support. Install libjack-jackd2-dev (Debian) or jack-audio-connection-kit-devel (Fedora).")
+endif()
+target_compile_options(mixer-daemon PRIVATE -Wall -Wextra -Wpedantic)
+
+# ---------------------------------------------------------------------------
+# Tests
+# ---------------------------------------------------------------------------
+enable_testing()
+
+add_executable(mixer-test
+    tests/test_main.cpp
+    ${MIXER_SOURCES}
+)
+target_include_directories(mixer-test PRIVATE include)
+target_link_libraries(mixer-test nlohmann_json::nlohmann_json)
+target_compile_options(mixer-test PRIVATE -Wall -Wextra -Wpedantic)
+add_test(NAME mixer-core-test COMMAND mixer-test)
+
+# ---------------------------------------------------------------------------
+# Install
+# ---------------------------------------------------------------------------
+install(TARGETS mixer-daemon RUNTIME DESTINATION bin)
+install(FILES ${MIXER_HEADERS} DESTINATION include/mixer)