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unit portmidi;
{
Minimal Pascal bindings for PortMidi (https://github.com/PortMidi/portmidi).
Only the input-side of the API is translated - that's all hUGETracker needs.
PortMidi is loaded dynamically via the dynlibs unit so the application still
runs on machines where the shared library isn't installed; callers should
check LoadPortMidi before touching any of the Pm_* routines.
Calling convention is cdecl on every supported platform (PortMidi's public
header uses PMEXPORT which is either empty or __declspec; there is no
__stdcall). PortTime is not bound here; passing nil for the time_proc /
time_info parameters of Pm_OpenInput makes PortMidi use its own internal
millisecond clock, which is all we need for note input.
}
{$mode objfpc}{$H+}
interface
uses
ctypes, dynlibs, SysUtils;
const
{$if defined(MSWINDOWS)}
PortMidiLibName = 'portmidi.dll';
{$elseif defined(DARWIN)}
PortMidiLibName = 'libportmidi.dylib';
{$else}
PortMidiLibName = 'libportmidi.so.2';
{$endif}
pmNoError = 0;
pmNoData = 0;
pmGotData = 1;
pmHostError = -10000;
pmInvalidDeviceId = -9999;
pmInsufficientMemory = -9998;
pmBufferTooSmall = -9997;
pmBufferOverflow = -9996;
pmBadPtr = -9995;
pmBadData = -9994;
pmInternalError = -9993;
pmBufferMaxSize = -9992;
pmNotImplemented = -9991;
pmInterfaceNotSupported = -9990;
pmNameConflict = -9989;
pmDeviceRemoved = -9988;
pmNoDevice = -1;
type
PmError = cint32;
PmDeviceID = cint32;
PmTimestamp = cint32;
PmMessage = cuint32;
PPortMidiStream = Pointer;
PPPortMidiStream = ^PPortMidiStream;
PmTimeProcPtr = function(time_info: Pointer): PmTimestamp; cdecl;
TPmDeviceInfo = record
structVersion: cint;
interf: PAnsiChar;
name: PAnsiChar;
input: cint;
output: cint;
opened: cint;
is_virtual: cint;
end;
PPmDeviceInfo = ^TPmDeviceInfo;
TPmEvent = record
message_: PmMessage;
timestamp: PmTimestamp;
end;
PPmEvent = ^TPmEvent;
var
Pm_Initialize: function: PmError; cdecl;
Pm_Terminate: function: PmError; cdecl;
Pm_HasHostError: function(stream: PPortMidiStream): cint; cdecl;
Pm_GetErrorText: function(errnum: PmError): PAnsiChar; cdecl;
Pm_GetHostErrorText: procedure(msg: PAnsiChar; len: cuint); cdecl;
Pm_CountDevices: function: cint; cdecl;
Pm_GetDefaultInputDeviceID: function: PmDeviceID; cdecl;
Pm_GetDefaultOutputDeviceID: function: PmDeviceID; cdecl;
Pm_GetDeviceInfo: function(id: PmDeviceID): PPmDeviceInfo; cdecl;
Pm_OpenInput: function(out stream: PPortMidiStream;
inputDevice: PmDeviceID;
inputSysDepInfo: Pointer;
bufferSize: cint32;
time_proc: PmTimeProcPtr;
time_info: Pointer): PmError; cdecl;
Pm_SetFilter: function(stream: PPortMidiStream; filters: cint32): PmError; cdecl;
Pm_SetChannelMask: function(stream: PPortMidiStream; mask: cint): PmError; cdecl;
Pm_Abort: function(stream: PPortMidiStream): PmError; cdecl;
Pm_Close: function(stream: PPortMidiStream): PmError; cdecl;
Pm_Read: function(stream: PPortMidiStream; buffer: PPmEvent; length: cint32): cint; cdecl;
Pm_Poll: function(stream: PPortMidiStream): PmError; cdecl;
function LoadPortMidi: Boolean;
procedure UnloadPortMidi;
function IsPortMidiLoaded: Boolean;
function Pm_MessageStatus(msg: PmMessage): Byte; inline;
function Pm_MessageData1(msg: PmMessage): Byte; inline;
function Pm_MessageData2(msg: PmMessage): Byte; inline;
implementation
var
LibHandle: TLibHandle = NilHandle;
function IsPortMidiLoaded: Boolean;
begin
Result := LibHandle <> NilHandle;
end;
function Pm_MessageStatus(msg: PmMessage): Byte;
begin
Result := Byte(msg and $FF);
end;
function Pm_MessageData1(msg: PmMessage): Byte;
begin
Result := Byte((msg shr 8) and $FF);
end;
function Pm_MessageData2(msg: PmMessage): Byte;
begin
Result := Byte((msg shr 16) and $FF);
end;
function ResolveSym(const Name: String): Pointer;
begin
Result := GetProcedureAddress(LibHandle, Name);
if Result = nil then begin
UnloadLibrary(LibHandle);
LibHandle := NilHandle;
end;
end;
function TryLoad(const Name: String): TLibHandle;
begin
Result := LoadLibrary(Name);
end;
function LoadPortMidi: Boolean;
var
ExeDir: String;
begin
if LibHandle <> NilHandle then
Exit(True);
LibHandle := TryLoad(PortMidiLibName);
// On non-Windows, dlopen() by filename only does not search the
// executable's directory, so explicitly look next to the running binary
// before falling back to system paths.
ExeDir := ExtractFilePath(ParamStr(0));
if (LibHandle = NilHandle) and (ExeDir <> '') then
LibHandle := TryLoad(ExeDir + PortMidiLibName);
{$ifdef LINUX}
if LibHandle = NilHandle then LibHandle := TryLoad('libportmidi.so');
if LibHandle = NilHandle then LibHandle := TryLoad('libportmidi.so.0');
if LibHandle = NilHandle then LibHandle := TryLoad('libportmidi.so.1');
if (LibHandle = NilHandle) and (ExeDir <> '') then
LibHandle := TryLoad(ExeDir + 'libportmidi.so');
{$endif}
{$ifdef DARWIN}
if LibHandle = NilHandle then LibHandle := TryLoad('libportmidi.2.dylib');
if (LibHandle = NilHandle) and (ExeDir <> '') then
LibHandle := TryLoad(ExeDir + 'libportmidi.2.dylib');
if LibHandle = NilHandle then LibHandle := TryLoad('/usr/local/lib/libportmidi.dylib');
if LibHandle = NilHandle then LibHandle := TryLoad('/opt/homebrew/lib/libportmidi.dylib');
{$endif}
if LibHandle = NilHandle then Exit(False);
Pointer(Pm_Initialize) := ResolveSym('Pm_Initialize');
Pointer(Pm_Terminate) := ResolveSym('Pm_Terminate');
Pointer(Pm_HasHostError) := ResolveSym('Pm_HasHostError');
Pointer(Pm_GetErrorText) := ResolveSym('Pm_GetErrorText');
Pointer(Pm_GetHostErrorText) := ResolveSym('Pm_GetHostErrorText');
Pointer(Pm_CountDevices) := ResolveSym('Pm_CountDevices');
Pointer(Pm_GetDefaultInputDeviceID) := ResolveSym('Pm_GetDefaultInputDeviceID');
Pointer(Pm_GetDefaultOutputDeviceID) := ResolveSym('Pm_GetDefaultOutputDeviceID');
Pointer(Pm_GetDeviceInfo) := ResolveSym('Pm_GetDeviceInfo');
Pointer(Pm_OpenInput) := ResolveSym('Pm_OpenInput');
Pointer(Pm_SetFilter) := ResolveSym('Pm_SetFilter');
Pointer(Pm_SetChannelMask) := ResolveSym('Pm_SetChannelMask');
Pointer(Pm_Abort) := ResolveSym('Pm_Abort');
Pointer(Pm_Close) := ResolveSym('Pm_Close');
Pointer(Pm_Read) := ResolveSym('Pm_Read');
Pointer(Pm_Poll) := ResolveSym('Pm_Poll');
Result := LibHandle <> NilHandle;
end;
procedure UnloadPortMidi;
begin
if LibHandle <> NilHandle then begin
UnloadLibrary(LibHandle);
LibHandle := NilHandle;
end;
end;
finalization
UnloadPortMidi;
end.
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