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unit UAudioInput_Portaudio;
interface
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
{$I ../switches.inc}
uses
Classes,
SysUtils,
UMusic;
implementation
uses
{$IFDEF UsePortmixer}
portmixer,
{$ENDIF}
portaudio,
UAudioCore_Portaudio,
URecord,
UIni,
ULog,
UMain;
type
TAudioInput_Portaudio = class(TAudioInputBase)
private
AudioCore: TAudioCore_Portaudio;
function EnumDevices(): boolean;
public
function GetName: String; override;
function InitializeRecord: boolean; override;
function FinalizeRecord: boolean; override;
end;
TPortaudioInputDevice = class(TAudioInputDevice)
private
RecordStream: PPaStream;
{$IFDEF UsePortmixer}
Mixer: PPxMixer;
{$ENDIF}
PaDeviceIndex: TPaDeviceIndex;
public
function Open(): boolean;
function Close(): boolean;
function Start(): boolean; override;
function Stop(): boolean; override;
function GetVolume(): integer; override;
procedure SetVolume(Volume: integer); override;
end;
function MicrophoneCallback(input: Pointer; output: Pointer; frameCount: Longword;
timeInfo: PPaStreamCallbackTimeInfo; statusFlags: TPaStreamCallbackFlags;
inputDevice: Pointer): Integer; cdecl; forward;
function MicrophoneTestCallback(input: Pointer; output: Pointer; frameCount: Longword;
timeInfo: PPaStreamCallbackTimeInfo; statusFlags: TPaStreamCallbackFlags;
inputDevice: Pointer): Integer; cdecl; forward;
var
singleton_AudioInputPortaudio : IAudioInput;
{ TPortaudioInputDevice }
function TPortaudioInputDevice.Open(): boolean;
var
Error: TPaError;
inputParams: TPaStreamParameters;
deviceInfo: PPaDeviceInfo;
SourceIndex: integer;
begin
Result := false;
// get input latency info
deviceInfo := Pa_GetDeviceInfo(PaDeviceIndex);
// set input stream parameters
with inputParams do
begin
device := PaDeviceIndex;
channelCount := AudioFormat.Channels;
sampleFormat := paInt16;
suggestedLatency := deviceInfo^.defaultLowInputLatency;
hostApiSpecificStreamInfo := nil;
end;
//Log.LogStatus(deviceInfo^.name, 'Portaudio');
//Log.LogStatus(floattostr(deviceInfo^.defaultLowInputLatency), 'Portaudio');
// open input stream
Error := Pa_OpenStream(RecordStream, @inputParams, nil,
AudioFormat.SampleRate,
paFramesPerBufferUnspecified, paNoFlag,
@MicrophoneCallback, Pointer(Self));
if(Error <> paNoError) then
begin
Log.LogError('Error opening stream: ' + Pa_GetErrorText(Error), 'TPortaudioInputDevice.Open');
Exit;
end;
{$IFDEF UsePortmixer}
// open default mixer
Mixer := Px_OpenMixer(RecordStream, 0);
if (Mixer = nil) then
begin
Log.LogError('Error opening mixer: ' + Pa_GetErrorText(Error), 'TPortaudioInputDevice.Open');
end
else
begin
// save current source selection and select new source
SourceIndex := Ini.InputDeviceConfig[CfgIndex].Input-1;
if (SourceIndex = -1) then
begin
// nothing to do if default source is used
SourceRestore := -1;
end
else
begin
// store current source-index and select new source
SourceRestore := Px_GetCurrentInputSource(Mixer); // -1 in error case
Px_SetCurrentInputSource(Mixer, SourceIndex);
end;
end;
{$ENDIF}
Result := true;
end;
function TPortaudioInputDevice.Start(): boolean;
var
Error: TPaError;
begin
Result := false;
// recording already started -> stop first
if (RecordStream <> nil) then
Stop();
// TODO: Do not open the device here (takes too much time).
if (not Open()) then
Exit;
// start capture
Error := Pa_StartStream(RecordStream);
if(Error <> paNoError) then
begin
Log.LogError('Error starting stream: ' + Pa_GetErrorText(Error), 'TPortaudioInputDevice.Start');
Close();
RecordStream := nil;
Exit;
end;
Result := true;
end;
function TPortaudioInputDevice.Stop(): boolean;
var
Error: TPaError;
begin
Result := false;
if (RecordStream = nil) then
Exit;
// Note: do NOT call Pa_StopStream here!
// It gets stuck on devices with non-working callback as Pa_StopStream
// waits until all buffers have been handled (which never occurs in that case).
Error := Pa_AbortStream(RecordStream);
if (Error <> paNoError) then
begin
Log.LogError('Pa_AbortStream: ' + Pa_GetErrorText(Error), 'TPortaudioInputDevice.Stop');
end;
Result := Close();
end;
function TPortaudioInputDevice.Close(): boolean;
var
Error: TPaError;
begin
{$IFDEF UsePortmixer}
if (Mixer <> nil) then
begin
// restore source selection
if (SourceRestore >= 0) then
begin
Px_SetCurrentInputSource(Mixer, SourceRestore);
end;
// close mixer
Px_CloseMixer(Mixer);
Mixer := nil;
end;
{$ENDIF}
Error := Pa_CloseStream(RecordStream);
if (Error <> paNoError) then
begin
Log.LogError('Pa_CloseStream: ' + Pa_GetErrorText(Error), 'TPortaudioInputDevice.Close');
Result := false;
end
else
begin
Result := true;
end;
RecordStream := nil;
end;
function TPortaudioInputDevice.GetVolume(): integer;
begin
Result := 0;
{$IFDEF UsePortmixer}
if (Mixer <> nil) then
begin
Result := Round(Px_GetInputVolume(Mixer) * 100);
// clip to valid range
if (Result > 100) then
Result := 100
else if (Result < 0) then
Result := 0;
end;
{$ENDIF}
end;
procedure TPortaudioInputDevice.SetVolume(Volume: integer);
begin
{$IFDEF UsePortmixer}
if (Mixer <> nil) then
begin
// clip to valid range
if (Volume > 100) then
Volume := 100
else if (Volume < 0) then
Volume := 0;
Px_SetInputVolume(Mixer, Volume / 100);
end;
{$ENDIF}
end;
{ TAudioInput_Portaudio }
function TAudioInput_Portaudio.GetName: String;
begin
result := 'Portaudio';
end;
function TAudioInput_Portaudio.EnumDevices(): boolean;
var
i: integer;
paApiIndex: TPaHostApiIndex;
paApiInfo: PPaHostApiInfo;
deviceName: string;
deviceIndex: TPaDeviceIndex;
deviceInfo: PPaDeviceInfo;
channelCnt: integer;
SC: integer; // soundcard
err: TPaError;
errMsg: string;
paDevice: TPortaudioInputDevice;
inputParams: TPaStreamParameters;
stream: PPaStream;
streamInfo: PPaStreamInfo;
sampleRate: double;
latency: TPaTime;
{$IFDEF UsePortmixer}
mixer: PPxMixer;
sourceCnt: integer;
sourceIndex: integer;
sourceName: string;
{$ENDIF}
cbPolls: integer;
cbWorks: boolean;
begin
Result := false;
// choose the best available Audio-API
paApiIndex := AudioCore.GetPreferredApiIndex();
if(paApiIndex = -1) then
begin
Log.LogError('No working Audio-API found', 'TAudioInput_Portaudio.EnumDevices');
Exit;
end;
paApiInfo := Pa_GetHostApiInfo(paApiIndex);
SC := 0;
// init array-size to max. input-devices count
SetLength(AudioInputProcessor.DeviceList, paApiInfo^.deviceCount);
for i:= 0 to High(AudioInputProcessor.DeviceList) do
begin
// convert API-specific device-index to global index
deviceIndex := Pa_HostApiDeviceIndexToDeviceIndex(paApiIndex, i);
deviceInfo := Pa_GetDeviceInfo(deviceIndex);
channelCnt := deviceInfo^.maxInputChannels;
// current device is no input device -> skip
if (channelCnt <= 0) then
continue;
// portaudio returns a channel-count of 128 for some devices
// (e.g. the "default"-device), so we have to detect those
// fantasy channel counts.
if (channelCnt > 8) then
channelCnt := 2;
paDevice := TPortaudioInputDevice.Create();
AudioInputProcessor.DeviceList[SC] := paDevice;
// retrieve device-name
deviceName := deviceInfo^.name;
paDevice.Name := deviceName;
paDevice.PaDeviceIndex := deviceIndex;
sampleRate := deviceInfo^.defaultSampleRate;
// on vista and xp the defaultLowInputLatency may be set to 0 but it works.
// TODO: correct too low latencies (what is a too low latency, maybe < 10ms?)
latency := deviceInfo^.defaultLowInputLatency;
// setup desired input parameters
// TODO: retry with input-latency set to 20ms (defaultLowInputLatency might
// not be set correctly in OSS)
with inputParams do
begin
device := deviceIndex;
channelCount := channelCnt;
sampleFormat := paInt16;
suggestedLatency := latency;
hostApiSpecificStreamInfo := nil;
end;
// check souncard and adjust sample-rate
if (not AudioCore.TestDevice(@inputParams, nil, sampleRate)) then
begin
// ignore device if it does not work
Log.LogError('Device "'+paDevice.Name+'" does not work',
'TAudioInput_Portaudio.EnumDevices');
paDevice.Free();
continue;
end;
// open device for further info
err := Pa_OpenStream(stream, @inputParams, nil, sampleRate,
paFramesPerBufferUnspecified, paNoFlag, @MicrophoneTestCallback, nil);
if(err <> paNoError) then
begin
// unable to open device -> skip
errMsg := Pa_GetErrorText(err);
Log.LogError('Device error: "'+ deviceName +'" ('+ errMsg +')',
'TAudioInput_Portaudio.EnumDevices');
paDevice.Free();
continue;
end;
// adjust sample-rate (might be changed by portaudio)
streamInfo := Pa_GetStreamInfo(stream);
if (streamInfo <> nil) then
begin
if (sampleRate <> streamInfo^.sampleRate) then
begin
Log.LogStatus('Portaudio changed Samplerate from ' + FloatToStr(sampleRate) +
' to ' + FloatToStr(streamInfo^.sampleRate),
'TAudioInput_Portaudio.InitializeRecord');
sampleRate := streamInfo^.sampleRate;
end;
end;
// create audio-format info and resize capture-buffer array
paDevice.AudioFormat := TAudioFormatInfo.Create(
channelCnt,
sampleRate,
asfS16
);
SetLength(paDevice.CaptureChannel, paDevice.AudioFormat.Channels);
Log.LogStatus('InputDevice "'+paDevice.Name+'"@' +
IntToStr(paDevice.AudioFormat.Channels)+'x'+
FloatToStr(paDevice.AudioFormat.SampleRate)+'Hz ('+
FloatTostr(inputParams.suggestedLatency)+'sec)' ,
'Portaudio.EnumDevices');
// portaudio does not provide a source-type check
paDevice.MicSource := -1;
paDevice.SourceRestore := -1;
// add a virtual default source (will not change mixer-settings)
SetLength(paDevice.Source, 1);
paDevice.Source[0].Name := DEFAULT_SOURCE_NAME;
{$IFDEF UsePortmixer}
// use default mixer
mixer := Px_OpenMixer(stream, 0);
// get input count
sourceCnt := Px_GetNumInputSources(mixer);
SetLength(paDevice.Source, sourceCnt+1);
// get input names
for sourceIndex := 1 to sourceCnt do
begin
sourceName := Px_GetInputSourceName(mixer, sourceIndex-1);
paDevice.Source[sourceIndex].Name := sourceName;
end;
Px_CloseMixer(mixer);
{$ENDIF}
// close test-stream
Pa_CloseStream(stream);
Inc(SC);
end;
// adjust size to actual input-device count
SetLength(AudioInputProcessor.DeviceList, SC);
Log.LogStatus('#Input-Devices: ' + inttostr(SC), 'Portaudio');
Result := true;
end;
function TAudioInput_Portaudio.InitializeRecord(): boolean;
var
err: TPaError;
begin
AudioCore := TAudioCore_Portaudio.GetInstance();
// initialize portaudio
err := Pa_Initialize();
if(err <> paNoError) then
begin
Log.LogError(Pa_GetErrorText(err), 'TAudioInput_Portaudio.InitializeRecord');
Result := false;
Exit;
end;
Result := EnumDevices();
end;
function TAudioInput_Portaudio.FinalizeRecord: boolean;
begin
CaptureStop;
Pa_Terminate();
Result := inherited FinalizeRecord();
end;
{*
* Portaudio input capture callback.
*}
function MicrophoneCallback(input: Pointer; output: Pointer; frameCount: Longword;
timeInfo: PPaStreamCallbackTimeInfo; statusFlags: TPaStreamCallbackFlags;
inputDevice: Pointer): Integer; cdecl;
begin
AudioInputProcessor.HandleMicrophoneData(input, frameCount*4, inputDevice);
result := paContinue;
end;
{*
* Portaudio test capture callback.
*}
function MicrophoneTestCallback(input: Pointer; output: Pointer; frameCount: Longword;
timeInfo: PPaStreamCallbackTimeInfo; statusFlags: TPaStreamCallbackFlags;
inputDevice: Pointer): Integer; cdecl;
begin
// this callback is called only once
result := paAbort;
end;
initialization
singleton_AudioInputPortaudio := TAudioInput_Portaudio.create();
AudioManager.add( singleton_AudioInputPortaudio );
finalization
AudioManager.Remove( singleton_AudioInputPortaudio );
end.
|