diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/Makefile.am | 2 | ||||
| -rw-r--r-- | doc/lavcrate.txt | 33 |
2 files changed, 34 insertions, 1 deletions
diff --git a/doc/Makefile.am b/doc/Makefile.am index 17e5b99..5eda3bd 100644 --- a/doc/Makefile.am +++ b/doc/Makefile.am @@ -1,2 +1,2 @@ EXTRA_DIST = README-pcm-oss README-jack README-pulse README-maemo \ - upmix.txt vdownmix.txt samplerate.txt a52.txt + upmix.txt vdownmix.txt samplerate.txt a52.txt lavcrate.txt diff --git a/doc/lavcrate.txt b/doc/lavcrate.txt new file mode 100644 index 0000000..faf3e25 --- /dev/null +++ b/doc/lavcrate.txt @@ -0,0 +1,33 @@ +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. |