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Rate Converter Plugin Using libavcodec
======================================
The plugin in rate-lavc subdirectory is an external rate converter using
libavcodec's resampler. You can use this rate converter plugin by defining a
rate PCM with "converter" parameter, such as:
pcm.my_rate {
type rate
slave.pcm "hw"
converter "lavcrate"
}
The plug plugin has also a similar field, "rate_converter".
Or, more easily, define a global variable "defaults.pcm.rate_converter",
which is used as the default converter type by plug and rate plugins:
defaults.pcm.rate_converter "lavcrate"
Write the above in your ~/.asoundrc or /etc/asound.conf.
The following converter types are available:
- lavcrate_higher Use length=64
- lavcrate_high Use length=32
- lavcrate Use length=16
- lavcrate_fast Use length=8
- lavcrate_faster Use length=4
Linear interpolation and cutoff values are automatically used depending on
the supplied parameters and whether the plugin is used to upsample or
downsample.
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