The portion of the file holding the audio data. The audio data might be compressed to save disk space. The data has to be decompressed using an audio decompressor before you can play (hear) it.

oftware component which decompresses audio. It must be designed to work with ACM or DirectShow . Note that different compression methods require different decompressors. There is no universal decompressor capable of decoding all compressed streams.

IltmmMediaInfo::get_AudioChannels

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#include "ltmm.h"

C Syntax	HRESULT IltmmMediaInfo_get_AudioChannels(pMediaInfo, Channels)
C++ Syntax	HRESULT get_AudioChannels(Channels)

IltmmMediaInfo *pMediaInfo;	/* pointer to an interface */
long * Channels;	/* pointer to a variable */

Retrieves the number of audio channels for the current stream in the current source media file.

Parameter	Description
pMediaInfo	Pointer to an IltmmMediaInfo interface.
Channels	Pointer to a variable that receives the number of audio channels.

Returns

S_OK	The function was successful.
<> S_OK	An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation.

Comments

This function will fail if the current stream is not an audio stream .

The current source media file, set using IltmmMediaInfo::put_SourceFile, is the file for which the IltmmMediaInfo interface/object gets information. This function must be called before calling any of the other IltmmMediaInfo functions used for retrieving information.

To set the current stream, call IltmmMediaInfo::put_CurrentStream.

Required DLLs and Libraries

LTMM

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64

See Also

Elements:

Topics:

Multimedia Function Group
Media File Information

Example

For a C example, refer to Retrieving Media File Information for C.

For a C++ example, refer to Retrieving Media File Information for C++.