feat: Implement MT32 MIDI emulation (fixes #420) (#1201)

* WIP: mt32 support using munt

Still WIP, does not compile fully yet

- Added munt library for MT-32 MIDI emulation
- Added midiemu code from WinUAE
- Enabled WITH_MIDIEMU define

* change munt to static instead of shared library

* Fixed incorrect casting error

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.20)
+cmake_minimum_required(VERSION 3.18)
 project(amiberry)
 
 set(CMAKE_CXX_STANDARD 17)
@@ -31,6 +31,8 @@ include_directories(
 )
 
 add_subdirectory(external/libguisan)
+set(libmt32emu_SHARED FALSE)
+add_subdirectory(external/mt32emu)
 add_definitions(-fno-pie -DAMIBERRY -D_FILE_OFFSET_BITS=64)
 
 include(CheckSymbolExists)
@@ -117,6 +119,7 @@ add_executable(${PROJECT_NAME}
 		src/keybuf.cpp
 		src/main.cpp
 		src/memory.cpp
+		src/midiemu.cpp
 		src/native2amiga.cpp
 		src/ncr9x_scsi.cpp
 		src/ncr_scsi.cpp
@@ -365,9 +368,9 @@ find_library(LIBSERIALPORT_LIBRARIES serialport REQUIRED)
 find_path(LIBSERIALPORT_INCLUDE_DIR libserialport.h)
 
 INCLUDE_DIRECTORIES(${SDL2IMAGE_INCLUDE_DIRS} ${LIBSERIALPORT_INCLUDE_DIR})
-target_include_directories(${PROJECT_NAME} PRIVATE ./external/libguisan/include)
+target_include_directories(${PROJECT_NAME} PRIVATE ./external/libguisan/include ./external/mt32emu/src)
 
-TARGET_LINK_LIBRARIES(${PROJECT_NAME} PRIVATE guisan SDL2 SDL2_image SDL2_ttf ${DBUS_LIBRARIES} FLAC png mpg123 mpeg2convert mpeg2 serialport z)
+TARGET_LINK_LIBRARIES(${PROJECT_NAME} PRIVATE guisan mt32emu SDL2 SDL2_image SDL2_ttf ${DBUS_LIBRARIES} FLAC png mpg123 mpeg2convert mpeg2 serialport z)
 if(USE_OPENGL)
 	add_definitions(-DUSE_OPENGL)
 	find_package(OpenGL REQUIRED)

external/mt32emu/AUTHORS.txt

@@ -0,0 +1,93 @@
+Developers
+----------
+
+Dean "Canadacow" Beeler
+ - Original author of the MT-32 emulator.
+
+Jerome "KingGuppy" Fisher
+ - Extensive modifications to the MT-32 emulator. Many bugfixes. Many cool ideas and loads of code.
+   SMF2WAV conversion tool. Cross-platform UI-enabled application. Digital captures, analysis.
+
+"Mok"
+ - Through study of the original ROMs, provided information to greatly increase emulation accuracy.
+
+Tristan
+ - Original author of the ALSA driver.
+
+"SergM"
+ - Improved waveform generation and performance. High-level models of LA32 and reverb chips. Bugfixes.
+   Reimplemented Windows driver. Help with UI-enabled application.
+
+Contributors
+------------
+
+Jonathan Gevaryahu
+ - Sent his MT-32 all the way from Pennsylvania, USA to Australia to get ROM dumps.
+   Help with reverb analysis. LA32 ROM analysing.
+
+"The Guru" (http://unemulated.emuunlim.com/)
+ - Dumped the ROMs of the device above.
+
+Laust "Talus" Brock-Nannestad
+ - Dumped the CM-32L ROMs.
+
+"balrog"
+ - Helping with analysis, obtaining and dumping RWI-modded and v2.04 ROMs, supplying us with his costly logic analyzer. :)
+   LA32 ROM analysing.
+
+"Sarayan"
+ - Reversed some LA32 circuits and internal LA32 ROMs. LA32 ROM analysing.
+
+"IssaUt"
+ - Dumped the MT-32 v2.07 control ROM.
+
+"Cloudschatze"
+ - Dumped the CM-32LN v1.00 control ROM. Helped with analysis of quirks of the 3rd-gen devices.
+
+Martin Lukasek
+ - Dumped the MT-32 v2.06 control ROM.
+
+"sdhizumi"
+ - Dumped the MT-32 v2.03 control ROM.
+
+Also thanks go to Kaminari Redux, NewRisingSun, robertmo, ripsaw8080, Mau1wurf1977 and other inhabitants of VOGONS
+for their suggestions and help with debugging.
+
+Third-party code incorporated in library
+----------------------------------------
+
+The library incorporates a fast C++ implementation of SHA1 algorithm with a small memory footprint
+(https://code.google.com/archive/p/smallsha1/). Copyright (c) 2011, Micael Hildenborg.
+Distributed under the BSD 3-clause license as stated below.
+
+ Copyright (c) 2011, Micael Hildenborg
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of Micael Hildenborg nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY Micael Hildenborg ''AS IS'' AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL Micael Hildenborg BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Other code contributions
+------------------------
+
+We are grateful to many other contributors to the library code who submitted pull requests
+at GitHub with bug fixes, suggestions and improvements. See the main code repository
+(https://github.com/munt/munt/) to find detailed information.