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Rate Converter Plugin Using Speex Resampler
===========================================
The plugin in rate subdirectory is an external rate converter using
the Speex resampler (aka Public Parrot Hack) by Jean-Marc Valin. 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 "speexrate"
}
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 "speexrate"
Write the above in your ~/.asoundrc or /etc/asound.conf.
The following converter types are available:
- speexrate_best Use quality 10 (equivalent to SRC_SINC_BEST_QUALITY)
- speexrate_medium Use quality 5 (equivalent to SRC_SINC_MEDIUM_QUALITY)
- speexrate Use quality 3 (equivalent to SRC_SINC_FASTEST)