Audio Mixer

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DirectShow filter for real-time mixing of multiple multichannel audio streams.

Overview

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The Audio Mixer DirectShow filter mixes any number of mono, stereo or multichannel streams in all kinds of combinations. 8 to 32 bit depth supported with unlimited mixing flexibility.

If you need a DS filter for video, see Video Mixer DirectShow Filter. If you need both, check our Vision Mixer SDK, Live Chroma Key SDK or Virtual Studio SDK.

Features

3 stereo inputs are mixed into one stereo output.

• Real-time mixing.
• Unlimited number of mono, stereo or multichannel (up to 32 channels) input and output pins.
• From 8 to 32 bits per mono audio sample for any input and output stream.
• Unlimited mixing flexibility: any channel from an input pin can be mixed to any channel of an output pin with user-defined bit depth.
• Dynamic range compression to eliminate volume overflow (more information on Wikipedia).
• Seeking support.

Future Extentions

• Resampling (connections with different audio frequencies will be allowed).

Technical Specs

Supported Content

Input/output format: simple (WAVE_FORMAT_PCM) and multichannel (WAVE_FORMAT_EXTENSIBLE) PCM Audio. Frequencies must be the same for all input and output streams.

Properties of filter

Filter Interfaces:	IBaseFilter, IPersistStream, ISpecifyPropertyPages, IMLAudioMixer
Input Pin Media Types	MEDIATYPE_Audio, MEDIASUBTYPE_PCM, FORMAT_WaveFormatEx WAVEFORMATEX struct (wFormatTag = WAVE_FORMAT_PCM) WAVEFORMATEXTENSIBLE struct (Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE)
Input Pin Interfaces	IMemInputPin, IPin, IQualityControl
Output Pin Media Types	MEDIATYPE_Audio, MEDIASUBTYPE_PCM, FORMAT_WaveFormatEx WAVEFORMATEX struct (wFormatTag = WAVE_FORMAT_PCM) WAVEFORMATEXTENSIBLE struct (Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE)
Output Pin Interfaces	IMediaSeeking, IPin, IQualityControl
Merit	MERIT_DO_NOT_USE
Filter Categories	CLSID_LegacyAmFilterCategory, CLSID_MediaLooksCategory

See also

• Audio Mixer: DirectShow Specs
• Audio Mixer: Usage In GraphEdit
• Audio Mixer DirectShow Filter: Release Notes

Downloads

• Download a full-featured 30-day evaluation version!

Licensing

If you are interested in licensing this product please contact us through the link below.

• Contact us to receive a quote or if you have any technical questions!