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https://github.com/vgmstream/vgmstream.git
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102 lines
4.4 KiB
Markdown
102 lines
4.4 KiB
Markdown
# vgmstream
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## Compilation requirements
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**GCC**: you need GCC and MAKE somewhere in path. In Windows this means one of these:
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- MinGW-w64 (32bit version): https://sourceforge.net/projects/mingw-w64/
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- MSYS2 with the MinGW-w64_shell (32bit) package: https://msys2.github.io/
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**MSVC / Visual Studio**: Visual Studio Community 2015 (free) should work:
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- Visual Studio: https://www.visualstudio.com/downloads/
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**Git**: optional, to generate version numbers:
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- Git for Windows: https://git-scm.com/download/win
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## Compiling modules
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### test.exe / in_vgmstream (Winamp)
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**With GCC**: use the *./Makefile* in the root folder, see inside for options. For compilation flags check *test/Makefile.mingw* or *winamp/Makefile.mingw*.
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You need to manually rebuild if you change a *.h* file (use *make clean*).
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In Linux you may need to use *Makefile.unix.am* instead, and note that some Linux makefiles aren't up to date.
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Windows CMD example for test.exe:
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```
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set PATH=%PATH%;C:\Git\usr\bin
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set PATH=%PATH%;C:\mingw-w64\i686-5.4.0-win32-sjlj-rt_v5-rev0\mingw32\bin
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cd vgmstream
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mingw32-make.exe mingw_test -f Makefile ^
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VGM_ENABLE_FFMPEG=1 VGM_ENABLE_MAIATRAC3PLUS=0 ^
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SHELL=sh.exe CC=gcc.exe AR=ar.exe STRIP=strip.exe DLLTOOL=dlltool.exe WINDRES=windres.exe
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```
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**With MSVC**: open *./vgmstream.sln* and compile in Visual Studio.
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### foo_input_vgmstream (foobar2000)
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Requires MSVC (foobar/SDK only links to MSVC C++ DLLs) and these dependencies:
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- foobar2000 SDK, in ../foobar/: http://www.foobar2000.org/SDK
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- WTL includes (if needed): http://wtl.sourceforge.net/
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- FDK-AAC, in ../fdk-aac/: https://github.com/kode54/fdk-aac
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- QAAC, in ../qaac/: https://github.com/kode54/qaac
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FDK-AAC/QAAC can be disabled by removing VGM_USE_MP4V2 and VGM_USE_FDKAAC.
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Open *./vgmstream.sln* as a base and add *fb2k/foo_input_vgmstream.vcxproj*, which expects the above.
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You may need to manually add includes and libs from WTL and ../foobar/foobar2000/shared/ in the compiler/linker options.
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VS2013 may not be compatible with the SDK.
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### xmp-vgmstream (XMPlay)
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Currently only MSVC is supported, though it should be compilable with GCC.
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Use *xmp-vgmstream/xmp-vgmstream.sln*; FDK-AAC/QAAC may be needed (see above).
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## Development
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### Structure
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vgmstream uses C (C89 when possible), except the foobar2000 plugin (C++).
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```
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./ docs, scripts
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./ext_includes/ external includes for compiling
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./ext_libs/ external libs/DLLs for linking
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./fb2k/ foobar2000 plugin
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./src/ main vgmstream code and helpers
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./src/coding/ format sample decoders
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./src/layout/ format data demuxers
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./src/meta/ format header parsers
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./test/ test.exe CLI
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./unix/ Audacious plugin
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./winamp/ Winamp plugin
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./xmp-vgmstream/ XMPlay plugin
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```
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### Overview
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vgmstream works by parsing a music stream header (*meta/*), reading/demuxing data or looping (*layout/*) and decoding the compressed data into listenable PCM samples (*coding/*).
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Very simplified it goes like this:
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- player (test.exe, winamp plugin, etc) inits the stream *[main]*
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- init tries all parsers (metas) until one works *[init_vgmstream]*
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- parser reads header (channels, sample rate, loop points) and set ups a VGMSTREAM struct + layout/coding, if the format is correct *[init_vgmstream_(format-name)]*
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- player gets total_samples to play, based on the number of loops and other settings *[get_vgmstream_play_samples]*
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- player asks to fill a small sample buffer *[render_vgmstream]*
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- layout prepares bytes to read from the stream *[render_vgmstream_(layout)]*
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- decoder decodes bytes into PCM samples *[decode_vgmstream_(coding)]*
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- player plays those samples, asks to fill sample buffer, repeats until total_samples
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- layout moves back to loop_start when loop_end is reached *[vgmstream_do_loop]*
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### Adding new formats
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For new simple formats, assuming existing layout/coding:
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- *src/meta/(format-name).c*: create new format parser that reads all needed info from the stream header and inits VGMSTREAM
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- *src/meta/meta.h*: register parser's init
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- *src/vgmstream.h*: register new meta
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- *src/vgmstream.c*: add parser init to search list, add meta description
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- *winamp/in_vgmstream.c*
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*fb2k/in_vgmstream.cpp*
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*xml-vgmstream/DllMain.c*: add new extension to the format list
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- *src/Makefile*
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*src/meta/Makefile.unix.am*
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*src/libvgmstream.vcproj/vcxproj*: to compile new (format-name).c parser
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