I am playing with BASS from http://www.un4seen.com/.
I need to create a flac file(16bits) or flac stream from user speaking on Microphone.
I have seen this demo in BASS source code. There is a bassenc_flac.dll as well with these functions:
function BASS_Encode_FLAC_Start(handle:DWORD; options:PChar; flags:DWORD; proc:ENCODEPROCEX; user:Pointer): HENCODE; {$IFDEF MSWINDOWS}stdcall{$ELSE}cdecl{$ENDIF}; external bassencflacdll;
function BASS_Encode_FLAC_StartFile(handle:DWORD; options:PChar; flags:DWORD; filename:PChar): HENCODE; {$IFDEF MSWINDOWS}stdcall{$ELSE}cdecl{$ENDIF}; external bassencflacdll;
How could I change the next code to encode the audio to flac file or stream?
From RecordTest BASS demo
(* This is called while recording audio *)
function RecordingCallback(Handle: HRECORD; buffer: Pointer; length: DWORD; user: Pointer): boolean; stdcall;
var level:dword;
begin
level:=BASS_ChannelGetLevel(Handle);
// Copy new buffer contents to the memory buffer
Form1.WaveStream.Write(buffer^, length);
// Allow recording to continue
Result := True;
end;
(* Start recording to memory *)
procedure TForm1.StartRecording;
begin
if ComboBox1.ItemIndex < 0 then Exit;
if WaveStream.Size > 0 then
begin // free old recording
BASS_StreamFree(chan);
WaveStream.Clear;
end;
// generate header for WAV file
with WaveHdr do
begin
riff := 'RIFF';
len := 36;
cWavFmt := 'WAVEfmt ';
dwHdrLen := 16;
wFormat := 1;
wNumChannels := 2;
dwSampleRate := 44100;
wBlockAlign := 4;
dwBytesPerSec := 176400;
wBitsPerSample := 16;
cData := 'data';
dwDataLen := 0;
end;
WaveStream.Write(WaveHdr, SizeOf(WAVHDR));
// start recording @ 44100hz 16-bit stereo
rchan := BASS_RecordStart(44100, 2, 0, @RecordingCallback, nil);
if rchan = 0 then
begin
MessageDlg('Couldn''t start recording!', mtError, [mbOk], 0);
WaveStream.Clear;
end
else
begin
bRecord.Caption := 'Stop';
bPlay.Enabled := False;
bSave.Enabled := False;
end;
end;
(* Stop recording *)
procedure TForm1.StopRecording;
var
i: integer;
he:BassEnc.HENCODE;
begin
BASS_ChannelStop(rchan);
bRecord.Caption := 'Record';
// complete the WAV header
WaveStream.Position := 4;
i := WaveStream.Size - 8;
WaveStream.Write(i, 4);
i := i - $24;
WaveStream.Position := 40;
WaveStream.Write(i, 4);
WaveStream.Position := 0;
// create a stream from the recorded data
chan := BASS_StreamCreateFile(True, WaveStream.Memory, 0, WaveStream.Size, 0);
if chan <> 0 then
begin
// enable "Play" & "Save" buttons
bPlay.Enabled := True;
bSave.Enabled := True;
end
else
MessageDlg('Error creating stream from recorded data!', mtError, [mbOk], 0);
if SaveDialog.Execute then
WaveStream.SaveToFile(SaveDialog.FileName);
end;