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IMpegAudioDecoder interface

The IMpegAudioDecoder interface is exposed on the MPEG-1 Audio Decoder filter and it enables applications to control decoding parameters. Most of these methods are useful only when an application is running on an older system and needs to sacrifice quality to increase performance. The default values provide the optimal decoding quality.

The two methods that are still useful in some scenarios are get_DualMode and put_DualMode. These methods enable applications to access either the right or left channel in VCD-based karaoke discs.

Members

The IMpegAudioDecoder interface inherits from the IUnknown interface. IMpegAudioDecoder also has these types of members:

Methods

The IMpegAudioDecoder interface has these methods.

MethodDescription
get_AudioFormat

Returns the audio format of the connected input pin.

get_DecoderAccuracy

Returns the decoder accuracy as a three-level quality setting.

get_DecoderWordSize

Returns the word size used to decode, either eight or 16 bit.

get_DualMode

Returns which channel is currently being decoded.

get_FrequencyDivider

Returns the frequency divider as a quality setting equal to CD Audio, FM Radio, or AM Radio.

get_IntegerDecode

Returns whether the decoder is currently using integer-based decoding as opposed to floating point decoding.

get_Stereo

Returns whether the decoder is decoding the encoded stream into stereo or mono PCM.

put_DecoderAccuracy

Specifies the quality as high, full or best.

put_DecoderWordSize

Specifies the word size used by the decoder.

put_DualMode

Specifies the channel to be decoded.

put_FrequencyDivider

Specifies the frequency divider as a three-level setting corresponding to the quality of CD Audio, FM Radio, or AM Radio.

put_IntegerDecode

Specifies whether the decoder will use integer-based decoding.

put_Stereo

Specifies whether the decoder will decode the encoded stream into stereo or mono PCM.

 

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Mpegtype.h

Library

Strmiids.lib

 

 

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