{Build} Add CMake support for OPUS build

Summary:
Enable optional OPUS compilation
- Add a CMake preprocessor `BUILD_WITH_OPUS`
- If required:
  - Add CMake rules to fetch OPUS library
  - Enable `OPUS_IS_AVAILABLE` CPP
- Update `pixi run build` to compile with OPUS support by default to ease CI and testing long term support of the feature

Differential Revision:
D68632323

Privacy Context Container: L1163201

CMakeLists.txt

@@ -70,6 +70,7 @@ add_subdirectory(vrs)
 
 OPTION(BUILD_TOOLS "Build all of the tools" ON)
 OPTION(BUILD_SAMPLES "Build sample code and sample apps" ON)
+OPTION(BUILD_WITH_OPUS "Build VRS to support OPUS" OFF)
 
 if (BUILD_TOOLS)
   # Add the vrs command line utility

cmake/LibrariesSetup.cmake

@@ -33,6 +33,18 @@ find_package(PNG REQUIRED)
 find_package(JPEG REQUIRED)
 find_package(TurboJpeg REQUIRED)
 
+if (BUILD_WITH_OPUS)
+  include(FetchContent)
+  FetchContent_Declare(
+    opus
+    URL      https://downloads.xiph.org/releases/opus/opus-1.5.2.tar.gz
+    URL_HASH SHA256=65c1d2f78b9f2fb20082c38cbe47c951ad5839345876e46941612ee87f9a7ce1
+  )
+  FetchContent_MakeAvailable(opus)
+  message("BUILD WITH OPUS: ON")
+endif()
+
+
 # Setup unit test infra, but only if unit tests are enabled
 if (UNIT_TESTS)
   enable_testing()

pixi.toml

@@ -27,7 +27,7 @@ version = "1.1.0"
 # Note: extra CLI argument after `pixi run TASK` are passed to the task cmd.
 clean = { cmd = "rm -rf build" }
 print-env = { cmd = "echo $PATH" }
-prepare = "cmake -G 'Ninja' -B build -S . -DCMAKE_BUILD_TYPE=Release"
+prepare = "cmake -G 'Ninja' -B build -S . -DCMAKE_BUILD_TYPE=Release -DBUILD_WITH_OPUS:BOOL=ON"
 build = { cmd = "cmake --build build --config Release --target all", depends_on = [
     "prepare",
 ] }
@@ -36,7 +36,7 @@ vrs = { cmd = "build/tools/vrs/vrs", depends_on = ["build"]}
 
 [target.win-64.tasks] # Deal with windows specifics (prepare and build)
 cmake-generator = "cmake --help"
-prepare = "cmake -G 'Visual Studio 16 2019' -B build -S . -DCMAKE_BUILD_TYPE=Release"
+prepare = "cmake -G 'Visual Studio 16 2019' -B build -S . -DCMAKE_BUILD_TYPE=Release -DBUILD_WITH_OPUS:BOOL=ON"
 build = { cmd = "cmake --build build --config Release  -- /m", depends_on = [
     "prepare",
 ] }

vrs/utils/CMakeLists.txt

@@ -36,6 +36,12 @@ target_link_libraries(vrs_utils
     rapidjson::rapidjson
     vrs_logging
 )
+
+if (BUILD_WITH_OPUS)
+  target_link_libraries(vrs_utils PRIVATE opus)
+  target_compile_definitions(vrs_utils PRIVATE OPUS_IS_AVAILABLE)
+endif()
+
 target_include_directories(vrs_utils
   INTERFACE
     $<BUILD_INTERFACE:${VRS_SOURCE_DIR}>