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.

Also known as compressor, this is a module or algorithm to compress data. Playing that data back requires a decompressor, or decoder.decoder .

Also known as a decompressor, this is a module or algorithm to decompress data.

ILMVorbisEncoder Interface

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Interface Properties:

Type	Name	Description
VARIANT_BOOL	EnableQualityFactor	If this property is TRUE, the output will be compressed using a variable byte rate, and the QualityFactor property should be used to control compression. Set this option to TRUE when consistent audio quality and high compression are the top priority. If this property is FALSE, the output will be compressed at a constant byterate, and the MaximumByteRate, MinimumByteRate and NominalByteRate properties should be used to control compression. This is useful to generate a predictable file size and when an audio file needs to fit a constant bitrate transmission channel. Moreover, the compressed audio file is searchable, and therefore a particular point within the audio stream can be found. For more information on the quality factor and variable byte rate vs. constant byte rate, see the descriptions for the Variable Rate Radio Button, the Constant Rate Radio Button and the Quality Factor drop-down box above.
long	QualityFactor	This property controls the compression ratio when EnableQualityFactor is TRUE. There are 8 quality factors, ranging from "Highest Quality" (which produces the best audio quality and the biggest file size - low compression ratios) to "Smallest Size/Highest Compression" (which produces the smallest file size and the lowest audio quality - high compression ratios). "Quality and Size are equally important" is a good choice to produce very-near-CD-quality audio at roughly 17,500 Byte per second rate (160 Kbps). "Quality is more important than size", with approximately 120kbps gives a smaller file size and significantly better quality than MP3 compression at 128kbps.
long	NominalByteRate	This property contains the value to set as the average/nominal bitrate in bits per second. It is valid only if the EnableQualityFactor property is FALSE.
long	MaximumByteRate	This property contains the value to set as the maximum bitrate in bits per second. It is valid only if the EnableQualityFactor property is FALSE.
long	MinimumByteRate	This property contains the value to set as the minimum bitrate in bits per second. It is valid only if the EnableQualityFactor property is FALSE.
long	SamplePerSec	(read only) If the LEAD Vorbis Encoder input pin is connected, this property gets the input audio stream samples per second.
long	Channels	(read only) If the LEAD Vorbis Encoder input pin is connected, this property gets the input number of channels of the audio stream .
eVORBISMAXRATE	MaximumInputRate	Limits the Maximum Sample rate of the input stream coming to LEAD Vorbis Encoder. This way it can decrease the sampling rate of the input stream to increase compression. So if this property is set to R_11K, then any input audio stream with rate of 11000 (sample/sec) or above will be compressed at 11000 sample/sec but if it is below that value (8000 sample/sec) it will stay like that.
eVORBISMAXCHANNELS	MaximumInputChannels	Use this property to force the input audio stream to have a maximum number of channels. For example, if this property is set to C_I, no matter whether the input file is stereo or mono the input audio stream will be compressed as mono. Basically this property should be used to increase the compression of a stereo file by converting it to mono.
VARIANT_BOOL	IsAVIMuxConnected	(read only) This property returns TRUE if the LEAD Vorbis Encoder output pin is connected to the AVI Mux filter.

enum
{
   R_08K = 1,
   R_11K = 2,
   R_22K = 3,
   R_32K = 4,
   R_44K = 5,
   R_48K = 6

} eVORBISMAXRATE;

enum
{
C_1 = 1,
C_2 = 2,
}eVORBISMAXCHANNELS;