Windows apps
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

How to: Build a Basic Audio Processing Graph

The minimum requirement for enabling XAudio2 to play audio data is an audio processing graph, which is constructed from a single mastering voice and a single source voice.

To build a basic audio processing graph

  1. Initialize the XAudio2 engine by following the steps described in How to: Initialize XAudio2.
  2. Populate a WAVEFORMATEX and XAUDIO2_BUFFER structure by following the steps described in How to: Load Audio Data Files in XAudio2.
  3. Create a source voice using the CreateSourceVoice function.

    When you specify NULL for the pSendList argument of CreateSourceVoice, the source voice's output goes to the mastering voice created in step 1.

    
    IXAudio2SourceVoice* pSourceVoice;
    if( FAILED(hr = pXAudio2->CreateSourceVoice( &pSourceVoice, (WAVEFORMATEX*)&wfx,
                  0, XAUDIO2_DEFAULT_FREQ_RATIO, NULL, NULL, NULL ) ) ) return hr;
    
    
    
    After you finish this step, there is a simple audio graph consisting of the source voice, the mastering voice, and the audio device. The remaining steps in this how-to topic show you how to start audio data flowing through the graph.

    A simple audio graph

    A simple audio graph.

  4. Use the function SubmitSourceBuffer to submit an XAUDIO2_BUFFER to the source voice.

    
    if( FAILED(hr = pSourceVoice->SubmitSourceBuffer( &buffer ) ) )
        return hr;
    
    
  5. Use the Start function to start the source voice.

    
    if ( FAILED(hr = pSourceVoice->Start( 0, XAUDIO2_COMMIT_NOW ) ) )
        return hr;
    
    

Related topics

Audio Graphs
XAudio2 Programming Guide

 

 

Show:
© 2017 Microsoft