Cmake: Build FFmpeg for wasm target

CMakeLists.txt

@@ -47,6 +47,7 @@ set_mpeg(ON FALSE)
 set_vorbis(ON FALSE)
 set_ffmpeg(ON FALSE)
 
+option(USE_MAIATRAC3PLUS "Use MAIATRAC3+ for support of ATRAC3+" OFF)
 option(USE_G7221 "Use G7221 for support of ITU-T G.722.1 annex C" ON)
 option(USE_G719 "Use libg719_decode for support ITU-T G.719" ON)
 option(USE_ATRAC9 "Use LibAtrac9 for support of ATRAC9" ON)
@@ -100,7 +101,6 @@ endif()
 
 if(EMSCRIPTEN)
 	set(USE_MPEG OFF)
-	set(USE_FFMPEG OFF)
 	set(USE_JANSSON OFF)
 	set(BUILD_V123 OFF)
 	set(BUILD_AUDACIOUS OFF)
@@ -141,13 +141,6 @@ add_custom_target(version_h ALL DEPENDS ${VGM_SOURCE_DIR}/version_auto.h)
 include(FetchDependency)
 
 include(dependencies/ffmpeg)
-
-if(USE_FFMPEG)
-	option(USE_MAIATRAC3PLUS "Use MAIATRAC3+ for support of ATRAC3+" OFF)
-else()
-	option(USE_MAIATRAC3PLUS "Use MAIATRAC3+ for support of ATRAC3+" ON)
-endif()
-
 include(dependencies/mpg123)
 include(dependencies/vorbis)
 include(dependencies/libao)

cmake/FetchDependency.cmake

@@ -6,7 +6,7 @@ if(NOT WIN32)
 endif()
 
 function(FetchDependency name)
-	set(value_args DIR GIT_REPOSITORY GIT_TAG)
+	set(value_args DIR GIT_REPOSITORY GIT_TAG DOWNLOAD SUBDIR)
 	cmake_parse_arguments(ARGS "" "${value_args}" "" ${ARGN})
 	
 	if(NOT ARGS_DIR)
@@ -18,11 +18,12 @@ function(FetchDependency name)
 	
 	if(${name}_PATH AND IS_DIRECTORY "${${name}_PATH}")
 		set(${name}_SOURCE "(local path)" PARENT_SCOPE)
-	elseif(Git_FOUND AND ARGS_GIT_REPOSITORY)
+	elseif(Git_FOUND AND ARGS_GIT_REPOSITORY OR ARGS_DOWNLOAD)
 		set(${name}_PATH ${VGM_SOURCE_DIR}/dependencies/${ARGS_DIR})
 		set(${name}_PATH ${${name}_PATH} PARENT_SCOPE)
 		set(${name}_SOURCE "(download)" PARENT_SCOPE)
 		
+		if(Git_FOUND AND ARGS_GIT_REPOSITORY)
 			FetchContent_Declare(${name}_FETCH
 				GIT_REPOSITORY ${ARGS_GIT_REPOSITORY}
 				SOURCE_DIR ${${name}_PATH}
@@ -36,6 +37,23 @@ function(FetchDependency name)
 				message("Downloading ${ARGS_DIR}...")
 				FetchContent_Populate(${name}_FETCH)
 			endif()
+		else()
+			string(REGEX REPLACE ".*/" "" FILE ${ARGS_DOWNLOAD})
+			if(NOT EXISTS ${${name}_PATH}/${FILE})
+				message("Downloading ${ARGS_DIR}...")
+				file(DOWNLOAD
+					${ARGS_DOWNLOAD}
+					${${name}_PATH}/${FILE}
+				)
+				file(ARCHIVE_EXTRACT
+					INPUT ${${name}_PATH}/${FILE}
+					DESTINATION ${${name}_PATH}
+				)
+			endif()
+			if(ARGS_SUBDIR)
+				set(${name}_PATH ${${name}_PATH}/${ARGS_SUBDIR} PARENT_SCOPE)
+			endif()
+		endif()
 	else()
 		set(${name}_PATH "" PARENT_SCOPE)
 		set(USE_${name} OFF PARENT_SCOPE)

cmake/dependencies/ffmpeg.cmake

@@ -43,8 +43,14 @@ if(USE_FFMPEG)
 		endif()
 	endif()
 	if(USE_FFMPEG AND NOT WIN32 AND (NOT FFmpeg_FOUND OR FFMPEG_PATH OR BUILD_STATIC))
+		set(USE_FFMPEG_LIBOPUS OFF)
+		if(NOT EMSCRIPTEN)
 			find_package(PkgConfig REQUIRED)
-		pkg_check_modules(PC_OPUS REQUIRED opus>=1.1)
+			pkg_check_modules(PC_OPUS QUIET opus>=1.1)
+			if(PC_OPUS_FOUND)
+				set(USE_FFMPEG_LIBOPUS ON)
+			endif()
+		endif()
 		
 		FetchDependency(FFMPEG
 			DIR ffmpeg
@@ -60,8 +66,13 @@ if(USE_FFMPEG)
 				ac3 asf xwma mov oma ogg tak dsf wav aac dts dtshd mp3 bink flac msf xmv caf ape smacker pcm_s8 spdif mpc mpc8
 			)
 			set(FFMPEG_CONF_DECODER
-				ac3 wmapro wmav1 wmav2 wmavoice wmalossless xma1 xma2 dca tak dsd_lsbf dsd_lsbf_planar dsd_mbf dsd_msbf_planar aac atrac3 atrac3p mp1float mp2float mp3float binkaudio_dct binkaudio_rdft flac pcm_s16be pcm_s16be_planar pcm_s16le pcm_s16le_planar vorbis ape adpcm_ima_qt smackaud libopus pcm_s8 pcm_s8_planar mpc7 mpc8 alac adpcm_ima_dk3 adpcm_ima_dk4
+				ac3 wmapro wmav1 wmav2 wmavoice wmalossless xma1 xma2 dca tak dsd_lsbf dsd_lsbf_planar dsd_mbf dsd_msbf_planar aac atrac3 atrac3p mp1float mp2float mp3float binkaudio_dct binkaudio_rdft flac pcm_s16be pcm_s16be_planar pcm_s16le pcm_s16le_planar vorbis ape adpcm_ima_qt smackaud pcm_s8 pcm_s8_planar mpc7 mpc8 alac adpcm_ima_dk3 adpcm_ima_dk4
 			)
+			if(USE_FFMPEG_LIBOPUS)
+				list(APPEND FFMPEG_CONF_DECODER libopus)
+			else()
+				list(APPEND FFMPEG_CONF_DECODER opus)
+			endif()
 			set(FFMPEG_CONF_DISABLE_PARSER
 				mpeg4video h263
 			)
@@ -101,7 +112,6 @@ if(USE_FFMPEG)
 				--disable-everything
 				--enable-hwaccels
 				--enable-swresample
-				--enable-libopus
 				--enable-parser=${FFMPEG_CONF_PARSER}
 				--enable-demuxer=${FFMPEG_CONF_DEMUXER}
 				--enable-decoder=${FFMPEG_CONF_DECODER}
@@ -113,15 +123,46 @@ if(USE_FFMPEG)
 				--extra-cflags=--static
 				--pkg-config-flags=--static
 			)
+			if(USE_FFMPEG_LIBOPUS)
+				list(APPEND FFMPEG_CONF_ARGS
+					--enable-libopus
+				)
+			endif()
+			if(EMSCRIPTEN)
+				list(APPEND FFMPEG_CONF_ARGS
+					--cc=emcc
+					--ranlib=emranlib
+					--enable-cross-compile
+					--target-os=none
+					--arch=x86
+					--disable-runtime-cpudetect
+					--disable-asm
+					--disable-fast-unaligned
+					--disable-pthreads
+					--disable-w32threads
+					--disable-os2threads
+					--disable-debug
+					--disable-stripping
+					--disable-safe-bitstream-reader
+				)
+			endif()
 			
 			set(FFMPEG_LINK_PATH ${FFMPEG_BIN}/bin/usr/local/lib)
+			set(FFMPEG_INCLUDE_DIRS ${FFMPEG_BIN}/bin/usr/local/include)
 			
 			if(NOT EXISTS ${FFMPEG_LINK_PATH}/libavutil.a)
+				if(EMSCRIPTEN)
+					add_custom_target(FFMPEG_MAKE ALL
+						COMMAND emconfigure ./configure ${FFMPEG_CONF_ARGS} && emmake make && make install DESTDIR="${FFMPEG_BIN}/bin" && make clean
+						WORKING_DIRECTORY ${FFMPEG_PATH}
+					)
+				else()
 					add_custom_target(FFMPEG_MAKE ALL
 						COMMAND ./configure ${FFMPEG_CONF_ARGS} && make && make install DESTDIR="${FFMPEG_BIN}/bin" && make clean
 						WORKING_DIRECTORY ${FFMPEG_PATH}
 					)
 				endif()
+			endif()
 			
 			foreach(LIB avutil avformat swresample avcodec)
 				add_library(${LIB} STATIC IMPORTED)
@@ -129,6 +170,25 @@ if(USE_FFMPEG)
 					IMPORTED_LOCATION ${FFMPEG_LINK_PATH}/lib${LIB}.a
 				)
 			endforeach()
+			
+			if(EMSCRIPTEN)
+				FetchDependency(ZLIB
+					DIR zlib
+					DOWNLOAD https://zlib.net/zlib-1.2.11.tar.xz
+					SUBDIR zlib-1.2.11
+				)
+				
+				add_subdirectory(${ZLIB_PATH} ${ZLIB_BIN})
+				target_include_directories(example PRIVATE ${ZLIB_PATH})
+				target_include_directories(minigzip PRIVATE ${ZLIB_PATH})
+				target_include_directories(example64 PRIVATE ${ZLIB_PATH})
+				target_include_directories(minigzip64 PRIVATE ${ZLIB_PATH})
+				
+				add_library(z STATIC IMPORTED)
+				set_target_properties(z PROPERTIES
+					IMPORTED_LOCATION ${ZLIB_BIN}/libz.a
+				)
+			endif()
 		endif()
 	endif()
 endif()

cmake/dependencies/maitrac3plus.cmake

@@ -1,8 +1,6 @@
 if(USE_MAIATRAC3PLUS)
 	FetchDependency(MAIATRAC3PLUS
 		DIR maiatrac3plus
-		GIT_REPOSITORY https://github.com/emulibraries/maiatrac3plus
-		GIT_TAG 95c34f2651b0988a8ed762692925eb22700e9b42
 	)
 	
 	if(MAIATRAC3PLUS_PATH)
@@ -19,6 +17,8 @@ if(USE_MAIATRAC3PLUS)
 			${MAIATRAC3PLUS_PATH}/MaiAT3PlusDecoder/src/base/Mai_Mem.cc
 		COPYONLY)
 		add_subdirectory(${MAIATRAC3PLUS_PATH}/MaiAT3PlusDecoder ${MAIATRAC3PLUS_BIN})
+	else()
+		message(FATAL_ERROR "Path to MAIATRAC3+ must be set. (Use MAIATRAC3PLUS_PATH)")
 	endif()
 endif()
 if(NOT USE_MAIATRAC3PLUS)

cmake/dependencies/mpg123.cmake

@@ -7,29 +7,11 @@ if(NOT WIN32 AND USE_MPEG)
 		endif()
 	endif()
 	if(MPEG_PATH OR BUILD_STATIC OR NOT MPG123_FOUND)
-		set(MPEG_BIN ${VGM_BINARY_DIR}/dependencies/mpg123)
+		FetchDependency(MPEG
-		
+			DIR mpg123
-		if(MPEG_PATH)
+			DOWNLOAD https://downloads.sourceforge.net/mpg123/mpg123-1.28.2.tar.bz2
-			set(MPEG_SOURCE "(local path)")
+			SUBDIR mpg123-1.28.2
-		else()
-			set(MPEG_PATH ${VGM_SOURCE_DIR}/dependencies/mgp123)
-			set(MPEG_FILE ${MPEG_PATH}/mpg123-1.28.2.tar.bz2)
-			set(MPEG_SOURCE "(download)")
-			
-			if(NOT EXISTS ${MPEG_FILE})
-				
-				file(DOWNLOAD
-					https://downloads.sourceforge.net/mpg123/mpg123-1.28.2.tar.bz2
-					${MPEG_FILE}
 		)
-				file(ARCHIVE_EXTRACT
-					INPUT ${MPEG_FILE}
-					DESTINATION ${MPEG_PATH}
-				)
-			endif()
-			
-			set(MPEG_PATH ${MPEG_PATH}/mpg123-1.28.2)
-		endif()
 		
 		set(MPEG_LINK_PATH ${MPEG_BIN}/bin/usr/local/lib/libmpg123.a)
 		

cmake/vgmstream.cmake

@@ -73,7 +73,11 @@ macro(setup_target TARGET)
 			target_include_directories(${TARGET} PRIVATE ${FFMPEG_INCLUDE_DIRS})
 			if(LINK)
 				if(BUILD_STATIC)
+					if(USE_FFMPEG_LIBOPUS)
 						target_link_libraries(${TARGET} avformat avcodec avutil swresample opus pthread m z)
+					else()
+						target_link_libraries(${TARGET} avformat avcodec avutil swresample pthread m z)
+					endif()
 				else()
 					target_link_libraries(${TARGET} ${FFMPEG_LIBRARIES})
 				endif()