Using WAV Data

Microsoft DirectSound buffers play only waveform audio data consisting of digital samples of the sound at a fixed sampling rate. The representation of an analog signal by a sequence of numbers is known as Pulse Code Modulation (PCM).

WAV data is usually stored in files or resources in Resource Interchange File Format (RIFF). The data includes a description of the WAV format, including parameters such as the sampling rate and number of output channels. The format of a sound is described by a WaveFormat structure. Managed DirectSound does not support audio formats with more than two channels, as described in a C++ WAVEFORMATEXTENSIBLE structure.

DirectSound does not support compressed WAV formats. Applications should use the Audio Compression Manager (ACM) functions, provided with the Microsoft Win32 application programming interfaces (APIs) in the Microsoft Platform Software Development Kit (SDK), to convert compressed audio to PCM format before writing the data to a sound buffer.

For short sounds, you can create a SecondaryBuffer from a WAV file by using SecondaryBuffer(String,Device) or SecondaryBuffer(String,BufferDescription,Device). To access streaming buffers, you can use the SecondaryBuffer(Stream,Device) or SecondaryBuffer(Stream,BufferDescription,Device) constructors.

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