Class unavclWaveInDevice

Unit

unaVC_wave

Declaration

type unavclWaveInDevice = class(unavclInOutWavePipe)

Description

Real time PCM audio stream recording from the sound card or other hardware device.

Usage: If components has no provider component with formatProvider set to True, specify PCM stream parameters before activating: pcm_SamplesPerSec, pcm_BitsPerSample and pcm_NumChannels. Set deviceId property if required.

Example: refer to the vcTalkNow demo. It has waveIn_server and waveIn_client components. Both are used to record real-time PCM stream to be sent to remote side. waveIn_server has c_codec_serverOut component as a consumer. That means PCM stream produced by waveIn_server will be passed to c_codec_serverOut component automatically.

Hierarchy

• tComponent
• unavclInOutPipe
• unavclInOutWavePipe
• unavclWaveInDevice

Overview

Methods

	procedure AfterConstruction(); override;
	procedure createNewDevice(); override;

Properties

	property calcVolume;
	property deviceId;
	property enableDataProcessing;
	property isFormatProvider default true;
	property minActiveTime;
	property minVolumeLevel;
	property onThreshold;
	property silenceDetectionMode;
	property waveEngine;
	property waveInDevice: unaWaveInDevice read getWaveInDevice;

Description

Methods

	procedure AfterConstruction(); override;

	procedure createNewDevice(); override;
Creates waveIn (recording) device.

Properties

	property calcVolume;

	property deviceId;

	property enableDataProcessing;
Specifies whether the component would produce any data. Setting this property to False does not release the waveIn device. Set active property to False to release the device as well.

	property isFormatProvider default true;
waveIn component is usually a format provider–so this property value was changed to be true by default.

	property minActiveTime;

	property minVolumeLevel;

	property onThreshold;

	property silenceDetectionMode;

	property waveEngine;

	property waveInDevice: unaWaveInDevice read getWaveInDevice;
Returns waveIn device.

(c) 2012 Lake of Soft