dep: Add libsamplerate

dep/libsamplerate/cmake/FindOpus.cmake

@@ -0,0 +1,64 @@
+# - Find opus
+# Find the native opus includes and libraries
+#
+#  OPUS_INCLUDE_DIRS - where to find opus.h, etc.
+#  OPUS_LIBRARIES    - List of libraries when using opus.
+#  OPUS_FOUND        - True if Opus found.
+
+if(OPUS_INCLUDE_DIR)
+  # Already in cache, be silent
+  set(OPUS_FIND_QUIETLY TRUE)
+endif()
+
+find_package(Ogg QUIET)
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_OPUS QUIET opus)
+
+set(OPUS_VERSION ${PC_OPUS_VERSION})
+
+find_path(OPUS_INCLUDE_DIR opus/opus.h
+  HINTS
+    ${PC_OPUS_INCLUDEDIR}
+    ${PC_OPUS_INCLUDE_DIRS}
+    ${OPUS_ROOT})
+
+# MSVC built opus may be named opus_static.
+# The provided project files name the library with the lib prefix.
+
+find_library(OPUS_LIBRARY
+  NAMES
+    opus
+    opus_static
+    libopus
+    libopus_static
+  HINTS
+    ${PC_OPUS_LIBDIR}
+    ${PC_OPUS_LIBRARY_DIRS}
+    ${OPUS_ROOT})
+
+# Handle the QUIETLY and REQUIRED arguments and set OPUS_FOUND
+# to TRUE if all listed variables are TRUE.
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Opus
+  REQUIRED_VARS
+    OPUS_LIBRARY
+    OPUS_INCLUDE_DIR
+    Ogg_FOUND
+  VERSION_VAR
+    OPUS_VERSION)
+
+if(OPUS_FOUND)
+  set(OPUS_LIBRARIES ${OPUS_LIBRARY})
+  set(OPUS_INCLUDE_DIRS ${OPUS_INCLUDE_DIR} ${Ogg_INCLUDE_DIRS})
+
+  if(NOT TARGET Opus::opus)
+    add_library(Opus::opus UNKNOWN IMPORTED)
+    set_target_properties(Opus::opus PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${OPUS_INCLUDE_DIR}"
+      IMPORTED_LOCATION "${OPUS_LIBRARY}"
+      INTERFACE_LINK_LIBRARIES Ogg::ogg)
+  endif()
+endif()
+
+mark_as_advanced(OPUS_INCLUDE_DIR OPUS_LIBRARY)