contribs: chromaprint: more fixes for .pc file.

- Moved AVFFT check: FFMPEG_LIBRARIES might be unset even if
all needed FFmpeg libraries were found.
- Added an ability to link with VDSP/Accelerate Framework on macOS.

Author: thresheek

CMakeLists.txt

@@ -127,12 +127,16 @@ endif()
 if(FFT_LIB STREQUAL "vdsp")
 	if(ACCELERATE_LIBRARIES)
 		set(USE_VDSP ON)
+		set(CHROMAPRINT_ADDITIONAL_LIBS "-F${ACCELERATE_LIBRARIES} -framework Accelerate")
 	else()
 		message(FATAL_ERROR "Selected ${FFT_LIB} for FFT calculations, but the library is not found")
 	endif()
 elseif(FFT_LIB STREQUAL "avfft")
 	if(FFMPEG_LIBAVCODEC_FFT_FOUND)
 		set(USE_AVFFT ON)
+		find_package(PkgConfig)
+		pkg_check_modules(AVFFT REQUIRED libavcodec libavutil)
+		string(REPLACE ";" " " CHROMAPRINT_ADDITIONAL_LIBS "${AVFFT_LDFLAGS}")
 	else()
 		message(FATAL_ERROR "Selected ${FFT_LIB} for FFT calculations, but the library is not found")
 	endif()

libchromaprint.pc.cmake

@@ -7,6 +7,6 @@ Name: ${PROJECT_NAME}
 Description: Audio fingerprint library
 URL: http://acoustid.org/chromaprint
 Version: ${PROJECT_VERSION}
-Libs: -L${LIB_INSTALL_DIR} -lchromaprint
+Libs: -L${LIB_INSTALL_DIR} -lchromaprint @CHROMAPRINT_ADDITIONAL_LIBS@
 Cflags: -I${INCLUDE_INSTALL_DIR}