TsgcAudioRecorderWave captures the microphone through the Windows Wave API and delivers the audio as a live stream rather than a file. You control the sample rate, channel count and bit depth, which is what streaming and realtime scenarios need.
Streaming microphone capture. A worker prepares and queues buffers continuously, measures the level of each block and closes a segment after a configurable period of silence.
TsgcAudioRecorderWave
Streaming microphone capture
Win32 and Win64
sgcAI is self-contained. This component ships inside sgcAI together with the sgcWebSockets Core runtime it is built on, so there is no base license to buy.
Choose the sample format, set the silence thresholds, start. Audio arrives as a stream, not a file on disk.
uses
sgcAI, sgcAI_AudioRecorder_Wave;
var
oRecorder: TsgcAudioRecorderWave;
begin
oRecorder := TsgcAudioRecorderWave.Create(nil);
oRecorder.WaveOptions.SampleRate := 16000;
oRecorder.WaveOptions.Channels := 1;
oRecorder.WaveOptions.BitsPerSample := 16;
// Silence detection on the measured block level.
oRecorder.WaveOptions.LevelMin := 300;
oRecorder.WaveOptions.StopAfter := 1200;
oRecorder.WaveOptions.WaitForAudio := 100;
oRecorder.Start; // Stop ends capture
end;// includes: sgcAI.hpp, sgcAI_AudioRecorder_Wave.hpp
TsgcAudioRecorderWave *oRecorder = new TsgcAudioRecorderWave(NULL);
oRecorder->WaveOptions->SampleRate = 16000;
oRecorder->WaveOptions->Channels = 1;
oRecorder->WaveOptions->BitsPerSample = 16;
oRecorder->WaveOptions->LevelMin = 300;
oRecorder->WaveOptions->StopAfter = 1200;
oRecorder->Start();The members you reach for most often.
SampleRate, Channels and BitsPerSample set the capture format exactly, so you can match whatever the downstream model or codec expects.
LevelMin is the RMS level below which a block counts as silence, StopAfter is how long that silence closes the segment, and WaitForAudio is how long each buffer is given to fill.
Audio is delivered as a stream while capture runs, so it can be forwarded to a realtime endpoint or encoded on the fly instead of waiting for a file to close.
Start begins capture and Stop ends it. The capture loop runs on its own worker, so the UI thread is never blocked.
Use this one when you need a specific sample format or a live stream. Use TsgcAudioRecorderMCI when a WAV file per utterance is all you need.
The RMS level is computed per block from the 16 bit samples, which is also what you would drive a level meter with in the UI.
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