While `fopen` (used through the macro `FLUID_FOPEN`) uses UTF-8 on *nix, it's restricted to ANSI on Windows. A change to enable using paths containing non-ANSI characters was suggested before in issue #128 but was rejected due to requiring large parts of both the public API and private implementation to be modified to accommodate Windows.
This PR instead changes the macro definition for `FLUID_FOPEN` from `fopen` to a new wrapper, `fluid_fopen`. This wrapper is defined in `fluidsynth_priv.h` and defined in `fluid_sys.c` (following the pattern of `fluid_alloc`). Under Windows, it converts the `const char*` UTF-8 parameters to Unicode `wchar_t*` strings using the Windows API function `MultiByteToWideChar` and opens the file using the Windows API-specific `_wfopen`. On all other platforms, it simply calls `fopen`.
The public API is unchanged. This solution will require Windows users of the API to convert UTF-16 strings to UTF-8 (which then get converted back into UTF-16 anyway), but that's still an improvement over only being able to use ANSI paths.
This PR also adds a new test, `test_utf8_open`, which tests `FLUID_FOPEN` directly and through `fluid_is_soundfont` and `fluid_synth_sfload` using a new soundfont file, `sf2/â– VintageDreamsWaves-v2â– .sf2`, which is just a copy of `VintageDreamsWaves-v2.sf2` with Unicode characters in the filename.
Some MIDI files that uses the GS standard uses channels other than channel 10 as percussion channel. Currently FluidSynth ignores the messages setting that up, causing notes meant to be played with a drum instrument played with a melodic instrument or vice versa. This patch will partially fix the issue.
Currently the implementation in this patch doesn't cover a specific "quirk" in Roland GS Modules: they seem to remember the last used instrument in the selected mode. This patch simply sets the instrument number to 0 instead.
A test file is attached. If played correctly (with `-o synth.device-id=16`) no out of place drum or piano sounds should be heard.
[wikipedia_MIDI_sample_gstest.mid.gz](https://github.com/FluidSynth/fluidsynth/files/5610727/wikipedia_MIDI_sample_gstest.mid.gz)
This PR addresses #669 point 2.1.
It proposes set/get API functions to change/read fx unit parameters.
The deprecated shell commands are updated. Now the commands line have 2 parameters:
- first parameter is the fx unit index.
- second parameter is the value to apply to the fx unit.
Using \_linebr is not ideal, as it's an internal command. But that
seems to be the most compatible way to specify line breaks in ALIASES
accross different doxygen versions at the moment.
