Class unavclWaveResampler

Unit

unaVC_wave

Declaration

type unavclWaveResampler = class(unavclInOutWavePipe)

Description

Audio stream conversion from one PCM format to another. No ACM codecs are used by this component.

Usage: If components has no provider component with formatProvider=true, specify PCM stream parameters before activating: set pcm_SamplesPerSec, pcm_BitsPerSample and pcm_NumChannels to specify the source format parameters.

Set dst_SamplesPerSec, dst_BitsPerSample and dst_NumChannels properties to specify the destination stream format parameters.

Set realTime to true if you wish the resampling to be made in real time manner.

Example: c_resampler_client and c_resampler_server components are used in vcNetTalk demo for resampling the streams produced by WAV-reading components to PCM parameters required by mixers.

Hierarchy

• tComponent
• unavclInOutPipe
• unavclInOutWavePipe
• unavclWaveResampler

Overview

Methods

	function applyDeviceFormat(format: PWAVEFORMATEXTENSIBLE; isSrc: bool = true): bool; override;
	function getFormatExchangeData(out data: pointer): uint; override;
	procedure AfterConstruction(); override;
	procedure BeforeDestruction(); override;
	procedure createNewDevice(); override;

Properties

	property addSilence;
	property calcVolume;
	property dstFormatExt: PWAVEFORMATEXTENSIBLE read f_dstFormatExt write setDstFormat;
	property dst_BitsPerSample: unsigned index 1 read getDstSamplingParam write setDstSamplingParam default c_defSamplingBitsPerSample;
	property dst_NumChannels: unsigned index 2 read getDstSamplingParam write setDstSamplingParam default c_defSamplingNumChannels;
	property dst_SamplesPerSec: unsigned index 0 read getDstSamplingParam write setDstSamplingParam default c_defSamplingSamplesPerSec;
	property enableDataProcessing;
	property minActiveTime;
	property minVolumeLevel;
	property onThreshold;
	property realTime;
	property resampler: unaWaveResampler read getResampler;
	property silenceDetectionMode;
	property useSpeexDSP: boolean read f_uspeexdsp write setUspeexdsp default false;

Description

Methods

	function applyDeviceFormat(format: PWAVEFORMATEXTENSIBLE; isSrc: bool = true): bool; override;
Applies new audio format for PCM wave resampler device.

	function getFormatExchangeData(out data: pointer): uint; override;

	procedure AfterConstruction(); override;

	procedure BeforeDestruction(); override;

	procedure createNewDevice(); override;
Creates PCM wave resampler device.

Properties

	property addSilence;

	property calcVolume;

	property dstFormatExt: PWAVEFORMATEXTENSIBLE read f_dstFormatExt write setDstFormat;
Specifies destination PCM format of resampler device.

	property dst_BitsPerSample: unsigned index 1 read getDstSamplingParam write setDstSamplingParam default c_defSamplingBitsPerSample;
Specifies number of bits per sample for destination PCM format of resampler device.

	property dst_NumChannels: unsigned index 2 read getDstSamplingParam write setDstSamplingParam default c_defSamplingNumChannels;
Specifies number of channels per sample for destination PCM format of resampler device.

	property dst_SamplesPerSec: unsigned index 0 read getDstSamplingParam write setDstSamplingParam default c_defSamplingSamplesPerSec;
Specifies number of sampler per second for destination PCM format of resampler device.

	property enableDataProcessing;
Specifies whether the component would perform any data modifications.

	property minActiveTime;

	property minVolumeLevel;

	property onThreshold;

	property realTime;

	property resampler: unaWaveResampler read getResampler;
Returns PCM resampler device.

	property silenceDetectionMode;

	property useSpeexDSP: boolean read f_uspeexdsp write setUspeexdsp default false;

(c) 2012 Lake of Soft