CMake: separate options for FFmpeg decoder/dumper

Separate options are now provided for FFmpeg AAC audio decoder and FFmpeg video dumper. This allows users to configure Citra with greater freedom.

Also, previously for Linux builds, AAC decoder is accidentally enabled along with the dumper, which could potentially cause patent issues (?). This commit fixes it by only enabling video dumper.

src/audio_core/CMakeLists.txt

@@ -47,7 +47,7 @@ if(ENABLE_MF)
     )
     target_link_libraries(audio_core PRIVATE mf.lib mfplat.lib mfuuid.lib)
     target_compile_definitions(audio_core PUBLIC HAVE_MF)
-elseif(ENABLE_FFMPEG)
+elseif(ENABLE_FFMPEG_AUDIO_DECODER)
     target_sources(audio_core PRIVATE
         hle/ffmpeg_decoder.cpp
         hle/ffmpeg_decoder.h

src/citra_qt/main.cpp

@@ -606,7 +606,7 @@ void GMainWindow::ConnectMenuEvents() {
     connect(ui.action_Capture_Screenshot, &QAction::triggered, this,
             &GMainWindow::OnCaptureScreenshot);
 
-#ifndef ENABLE_FFMPEG
+#ifndef ENABLE_FFMPEG_VIDEO_DUMPER
     ui.action_Dump_Video->setEnabled(false);
 #endif
     connect(ui.action_Dump_Video, &QAction::triggered, [this] {

src/core/CMakeLists.txt

@@ -446,7 +446,7 @@ add_library(core STATIC
     tracer/recorder.h
 )
 
-if (ENABLE_FFMPEG)
+if (ENABLE_FFMPEG_VIDEO_DUMPER)
     target_sources(core PRIVATE
         dumping/ffmpeg_backend.cpp
         dumping/ffmpeg_backend.h

src/core/core.cpp

@@ -17,7 +17,7 @@
 #include "core/core.h"
 #include "core/core_timing.h"
 #include "core/dumping/backend.h"
-#ifdef ENABLE_FFMPEG
+#ifdef ENABLE_FFMPEG_VIDEO_DUMPER
 #include "core/dumping/ffmpeg_backend.h"
 #endif
 #include "core/gdbstub/gdbstub.h"
@@ -231,7 +231,7 @@ System::ResultStatus System::Init(Frontend::EmuWindow& emu_window, u32 system_mo
         return result;
     }
 
-#ifdef ENABLE_FFMPEG
+#ifdef ENABLE_FFMPEG_VIDEO_DUMPER
     video_dumper = std::make_unique<VideoDumper::FFmpegBackend>();
 #else
     video_dumper = std::make_unique<VideoDumper::NullBackend>();