lazdyn_portaudio.pas

{This is the Dynamic loadinng version of PortAudio.pas from the HuMuS team.
 You can choose the folder and file of the PortAudio library with Pa_load() and
 release it with Pa_unload().

 Fred van Stappen / fiens@hotmail.com
 }

{
  PortAudio bindings for FPC by the HuMuS team.
  Latest version available at: http://sourceforge.net/apps/trac/humus/

  Copyright (c) 2009-2010 HuMuS Project
  Maintained by Roland Schaefer

  PortAudio Portable Real-Time Audio Library
  Latest version available at: http://www.portaudio.com

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files
  (the "Software"), to deal in the Software without restriction,
  including without limitation the rights to use, copy, modify, merge,
  publish, distribute, sublicense, and/or sell copies of the Software,
  and to permit persons to whom the Software is furnished to do so,
  subject to the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
  CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

  The text above constitutes the entire PortAudio license; however, 
  the PortAudio community also makes the following non-binding requests:

  Any person wishing to distribute modifications to the Software is
  requested to send the modifications to the original developer so that
  they can be incorporated into the canonical version. It is also 
  requested that these non-binding requests be included along with the 
  license above.
}


unit LazDyn_PortAudio;



interface

uses

  dynlibs, CTypes  ;


type
  PaError = CInt32;
  PaErrorCode =(
    paNotInitialized := -10000,
    paUnanticipatedHostError,
    paInvalidChannelCount,
    paInvalidSampleRate,
    paInvalidDevice,
    paInvalidFlag,
    paSampleFormatNotSupported,
    paBadIODeviceCombination,
    paInsufficientMemory,
    paBufferTooBig,
    paBufferTooSmall,
    paNullCallback,
    paBadStreamPtr,
    paTimedOut,
    paInternalError,
    paDeviceUnavailable,
    paIncompatibleHostApiSpecificStreamInfo,
    paStreamIsStopped,
    paStreamIsNotStopped,
    paInputOverflowed,
    paOutputUnderflowed,
    paHostApiNotFound,
    paInvalidHostApi,
    paCanNotReadFromACallbackStream,
    paCanNotWriteToACallbackStream,
    paCanNotReadFromAnOutputOnlyStream,
    paCanNotWriteToAnInputOnlyStream,
    paIncompatibleStreamHostApi,
    paBadBufferPtr,
    paNoError := 0
  );


  PaDeviceIndex = CInt32;
  
  PaHostApiIndex = CInt32;
  
  
  PaHostApiTypeId =(paInDevelopment := 0,
    paDirectSound := 1,    
    paMME := 2,
    paASIO := 3,
    paSoundManager := 4,
    paCoreAudio := 5,
    paOSS := 7,
    paALSA := 8,
    paAL := 9,
    paBeOS := 10,
    paWDMKS := 11,
    paJACK := 12,
    paWASAPI := 13,
    paAudioScienceHPI := 14
  );
  
  
  PaHostApiInfo = record
    structVersion : CInt32;
    _type : PaHostApiTypeId ;
    _name : PChar;
    deviceCount : CInt32;
    defaultInputDevice : PaDeviceIndex;
    defaultOutputDevice : PaDeviceIndex;
  end;
  PPaHostApiInfo = ^PaHostApiInfo;
  
  
  PaHostErrorInfo = record
    hostApiType : PaHostApiTypeId;
    errorCode : CLong;
    errorText : PChar;
  end;
  PPaHostErrorInfo = ^PaHostErrorInfo;
  
  
  PaTime = CDouble;
  
  PaSampleFormat = pCULongLong;
  
  
  PaDeviceInfo = record
    structVersion : CInt32;
    _name : PChar;
    hostApi : PaHostApiIndex;
    maxInputChannels : CInt32;
    maxOutputChannels : CInt32;
    defaultLowInputLatency : PaTime;
    defaultLowOutputLatency : PaTime;
    defaultHighInputLatency : PaTime;
    defaultHighOutputLatency : PaTime;
    defaultSampleRate : CDouble;
  end;
  PPaDeviceInfo = ^PaDeviceInfo;


  PaStreamParameters = record
    device : PaDeviceIndex;
    channelCount : CInt32;
    sampleFormat : PaSampleFormat;
    suggestedLatency : PaTime;
    hostApiSpecificStreamInfo : Pointer;
  end;
  PPaStreamParameters = ^PaStreamParameters;


  // ************************* Streaming types *************************

  PaStream = Pointer;
  PPaStream = ^PaStream;
  PPPaStream = ^PPaStream;

  PaStreamFlags = CULong;

  PaStreamCallbackTimeInfo = record
    inputBufferAdcTime : PaTime;
    currentTime : PaTime;
    outputBufferDacTime : PaTime;
  end;
  PPaStreamCallbackTimeInfo = ^PaStreamCallbackTimeInfo;
  

  PaStreamCallbackFlags = CULong;


  PaStreamCallbackResult =(
    paContinue := 0,
    paComplete := 1,
    paAbort := 2);
  
  
  PaStreamCallback = function(
    input : Pointer;
    output : Pointer;
    frameCount : CULong;
    timeInfo : PPaStreamCallbackTimeInfo;
    statusFlags : PaStreamCallbackFlags;
    userData : Pointer) : CInt32;
  PPaStreamCallback = ^PaStreamCallback;  


  PaStreamFinishedCallback = procedure(userData : Pointer);
  PPaStreamFinishedCallback = ^PaStreamFinishedCallback;


  PaStreamInfo = record
    structVersion : CInt32;
    inputLatency : PaTime;
    outputLatency : PaTime;
    sampleRate : CDouble;
  end;
  PPaStreamInfo = ^PaStreamInfo;



const
  paFormatIsSupported = 0;
  paFramesPerBufferUnspecified = 0;
  paNoDevice = PaDeviceIndex(-1);
  paUseHostApiSpecificDeviceSpecification = PaDeviceIndex(-2);
  paFloat32 = PaSampleFormat($00000001);
  paInt32 = PaSampleFormat($00000002);
  paInt24 = PaSampleFormat($00000004);
  paInt16 = PaSampleFormat($00000008);
  paInt8 = PaSampleFormat($00000010);
  paUInt8 = PaSampleFormat($00000020);
  paCustomFormat = PaSampleFormat($00010000);
  paNonInterleaved = PaSampleFormat($80000000);
  paNoFlag = PaStreamFlags(0);
  paClipOff = PaStreamFlags($00000001);
  paDitherOff = PaStreamFlags($00000002);
  paNeverDropInput = PaStreamFlags($00000004);
  paPrimeOutputBuffersUsingStreamCallback = PaStreamFlags($00000008);
  paPlatformSpecificFlags = PaStreamFlags($FFFF0000);
  paInputUnderflow = PaStreamCallbackFlags($00000001);
  paInputOverflow = PaStreamCallbackFlags($00000002);
  paOutputUnderflow = PaStreamCallbackFlags($00000004);
  paOutputOverflow = PaStreamCallbackFlags($00000008);
  paPrimingOutput = PaStreamCallbackFlags($00000010);

  ////// Dynamic load : Vars that will hold our dynamically loaded functions...

// *************************** functions *******************************

 var Pa_GetVersion: function():CInt32 ; cdecl;

 var Pa_GetVersionText: function():PChar ; cdecl;

 var Pa_GetErrorText: function(errorCode : PaError):PChar ; cdecl;

 var Pa_Initialize: function():PaError ; cdecl;

 var Pa_Terminate: function():PaError ; cdecl;

  var Pa_GetHostApiCount: function():PaHostApiIndex ; cdecl;

 var Pa_GetDefaultHostApi: function():PaHostApiIndex ; cdecl;

 var Pa_GetHostApiInfo: function(hostApi : PaHostApiIndex):PPaHostApiInfo ; cdecl;

 var Pa_HostApiTypeIdToHostApiIndex: function(_type : PaHostApiTypeId):PaHostApiIndex ; cdecl;

  var Pa_HostApiDeviceIndexToDeviceIndex: function(hostApi : PaHostApiIndex;hostApiDeviceIndex : CInt32):PaDeviceIndex ; cdecl;

  var Pa_GetLastHostErrorInfo: function():PPaHostErrorInfo ; cdecl;

// ************** Device enumeration and capabilities ******************

   var Pa_GetDeviceCount: function:PaDeviceIndex ; cdecl;

      var Pa_GetDefaultInputDevice: function:PaDeviceIndex ; cdecl;

      var Pa_GetDefaultOutputDevice: function:PaDeviceIndex ; cdecl;

      var Pa_GetDeviceInfo: function(device : PaDeviceIndex):PPaDeviceInfo ; cdecl;

       var Pa_IsFormatSupported: function(inputParameters,outputParameters : PaStreamParameters; sampleRate : CDouble):PaError ; cdecl;

// *********************** Stream function *****************************

       var Pa_OpenStream: function(stream : PPPaStream;
  inputParameters : PPaStreamParameters;
  outputParameters : PPaStreamParameters;
  sampleRate : CDouble;
  framesPerBuffer : CULong;
  streamFlags : PaStreamFlags;
  streamCallback : PPaStreamCallback;
  userData : Pointer):PaError ; cdecl;

     var Pa_OpenDefaultStream: function(stream : PPPaStream;
  numInputChannels : CInt32;
  numOutputChannels : CInt32;
  sampleFormat : PaSampleFormat;
  sampleRate : CDouble;
  framesPerBuffer : CULong;
  streamCallback : PPaStreamCallback;
  userData : Pointer):PaError ; cdecl;

    var Pa_CloseStream: function(stream : PPaStream):PaError ; cdecl;

       var Pa_SetStreamFinishedCallback: function(stream : PPaStream;
  streamFinishedCallback : PPaStreamFinishedCallback):PaError ; cdecl;

      var Pa_StartStream: function(stream : PPaStream):PaError ; cdecl;

      var Pa_StopStream: function(stream : PPaStream):PaError ; cdecl;

        var Pa_AbortStream: function(stream : PPaStream):PaError ; cdecl;

        var Pa_IsStreamStopped: function(stream : PPaStream):PaError ; cdecl;

         var Pa_IsStreamActive: function(stream : PPaStream):PaError ; cdecl;

           var Pa_GetStreamInfo: function(stream : PPaStream):PPaStreamInfo ; cdecl;

           var Pa_GetStreamTime: function(stream : PPaStream):Patime ; cdecl;

         var Pa_GetStreamCpuLoad: function(stream : PPaStream):CDouble ; cdecl;

             var Pa_ReadStream: function(stream : PPaStream; buffer : Pointer;frames : CULong):PaError ; cdecl;

          var Pa_WriteStream: function(stream : PPaStream; buffer : Pointer;frames : CULong):PaError ; cdecl;

           var Pa_GetStreamReadAvailable: function(stream : PPaStream):CSLong ; cdecl;

             var Pa_GetStreamWriteAvailable: function(stream : PPaStream):CSLong ; cdecl;

// ****************** Miscellaneous utilities **************************

     var Pa_GetSampleSize: function(format : PaSampleFormat):PaError ; cdecl;

     var Pa_Sleep: function(msec : CLong) : integer; cdecl;

  ///////////////////////////////////////////////

       {Special function for dynamic loading of lib ...}

       var Pa_Handle:TLibHandle; // this will hold our handle for the lib; it functions nicely as a mutli-lib prevention unit as well...

       Function Pa_Load(const libfilename:string) :boolean; // load the lib

       Procedure Pa_Unload(); // unload and frees the lib from memory : do not forget to call it before close application.

       /////////////////////////////////////////////////////////////////////////////////////////////////

implementation

Function Pa_Load (const libfilename:string) :boolean;
begin
  Result := False;
  if Pa_Handle<>0 then result:=true {is it already there ?}
  else begin {go & load the library}
    if Length(libfilename) = 0 then exit;
    Pa_Handle:=DynLibs.LoadLibrary(libfilename); // obtain the handle we want
  	if Pa_Handle <> DynLibs.NilHandle then
       begin {now we tie the functions to the VARs from above}

Pointer(Pa_GetVersion):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetVersion'));
Pointer(Pa_GetVersionText):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetVersionText'));
Pointer(Pa_GetErrorText):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetErrorText'));
Pointer(Pa_Initialize):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_Initialize'));
Pointer(Pa_Terminate):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_Terminate'));
Pointer(Pa_GetHostApiCount):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetHostApiCount'));
Pointer(Pa_GetDefaultHostApi):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetDefaultHostApi'));
Pointer(Pa_GetHostApiInfo):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetHostApiInfo'));
Pointer(Pa_HostApiTypeIdToHostApiIndex):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_HostApiTypeIdToHostApiIndex'));
Pointer(Pa_HostApiDeviceIndexToDeviceIndex):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_HostApiDeviceIndexToDeviceIndex'));
Pointer(Pa_GetLastHostErrorInfo):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetLastHostErrorInfo'));
//////////////////
Pointer(Pa_GetDeviceCount):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetDeviceCount'));
Pointer(Pa_GetDefaultInputDevice):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetDefaultInputDevice'));
Pointer(Pa_GetDefaultOutputDevice):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetDefaultOutputDevice'));
Pointer(Pa_GetDeviceInfo):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetDeviceInfo'));
Pointer(Pa_IsFormatSupported):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_IsFormatSupported'));
//////////////////////
Pointer(Pa_OpenStream):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_OpenStream'));
Pointer(Pa_OpenDefaultStream):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_OpenDefaultStream'));
Pointer(Pa_CloseStream):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_CloseStream'));
Pointer(Pa_SetStreamFinishedCallback):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_SetStreamFinishedCallback'));
Pointer(Pa_StartStream):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_StartStream'));
Pointer(Pa_StopStream):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_StopStream'));
Pointer(Pa_AbortStream):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_AbortStream'));
Pointer(Pa_IsStreamStopped):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_IsStreamStopped'));
Pointer(Pa_IsStreamActive):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_IsStreamActive'));
Pointer(Pa_GetStreamInfo):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetStreamInfo'));
Pointer(Pa_GetStreamTime):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetStreamTime'));
Pointer(Pa_GetStreamCpuLoad):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetStreamCpuLoad'));
Pointer(Pa_ReadStream):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_ReadStream'));
Pointer(Pa_WriteStream):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_WriteStream'));
Pointer(Pa_GetStreamReadAvailable):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetStreamReadAvailable'));
Pointer(Pa_GetStreamWriteAvailable):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetStreamWriteAvailable'));
Pointer(Pa_GetSampleSize):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_GetSampleSize'));
Pointer(Pa_Sleep):=DynLibs.GetProcedureAddress(PA_Handle,PChar('Pa_Sleep'));
       end;
    result:=(Pa_Handle<>DynLibs.NilHandle);
  end;

end;

Procedure Pa_Unload;
begin
  if Pa_Handle<>DynLibs.NilHandle then
     begin
       Pa_Terminate();
      DynLibs.UnloadLibrary(Pa_Handle);
     end;
  Pa_Handle:=DynLibs.NilHandle;
end;

end.