Determining Nonstandard Format Support

To see whether a device supports a particular format (standard or nonstandard), you can call the waveOutOpen function with the WAVE_FORMAT_QUERY flag. The following example uses this technique to determine whether a waveform-audio device supports a specified format.

// Determines whether the specified waveform-audio output device

// supports a specified waveform-audio format. Returns

// MMSYSERR_NOERROR if the format is supported, WAVEERR_BADFORMAT if

// the format is not supported, and one of the other MMSYSERR_ error

// codes if there are other errors encountered in opening the

// specified waveform-audio device.



return (waveOutOpen(

NULL, // ptr can be NULL for query

uDeviceID, // the device identifier

pwfx, // defines requested format

NULL, // no callback

NULL, // no instance data

WAVE_FORMAT_QUERY)); // query only, do not open device


This technique for determining nonstandard format support also applies to waveform-audio input devices. The only difference is that the waveInOpen function is used in place of waveOutOpen to query for format support.

To determine whether a particular waveform-audio data format is supported by any of the waveform-audio devices in a system, use the technique illustrated in the previous example, but specify the WAVE_MAPPER constant for the uDeviceID parameter.

Software for developers
Delphi Components
.Net Components
Software for Android Developers
More information resources
Unix Manual Pages
Delphi Examples
Databases for Amazon shops developers
Amazon Categories Database
Browse Nodes Database