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- Playing back "other" sound formats:
- -----------------------------------
-
- The esdplay utility can be used to play a variety of audio files.
- However, it can't play everything. The sox utility understands
- many more types of audio files.
-
- The sound utility, sox, can be used with esd in primarily two ways.
-
- Method 1: use sox to convert the file format ahead of time.
- Method 2: use sox to generate output on stdout, and pipe into esdcat
-
- For accurate playback using either method, be sure to match the
- audio format (size/signedness of data, number of channels, and
- sample rate) between sox and esd. Converting mono to stereo, or
- changing the sampling rate with sox is probably not necessary for
- live playback, as it will have little effect on sound quality,
- and merely chew up additional CPU. For example to play back a sample
- that was recorded in Sun audio format (.au), mono, at 8000 Hz, using
- esdcat, type the following:
-
- sox sample.au -c 1 -r 8000 -t ub - | esdcat -b -m -r 8000
-
- sox arguments: -t ub = data type unsigned byte
- -c 1 = mono
- -r 8000 = sample rate 8000 Hz
- - = output file
-
- esdcat arguments: -b = data type unsigned byte
- -m = mono
- -r 8000 = sample rate 8000 Hz
-
- Currently, esd only supports unsigned byte, and signed word data types.
-
-
- Playing back mp3 files:
- -----------------------
- From Wayne Johnson,
- mpg123 -s sample.mp3 | esdcat
-
- NOTE: recent versions of mpg123 support esd directly.
- Type "make" to see possible executable varieties.
-
-
- Checking recording capabilities:
- --------------------------------
-
- To make sure the recoding works, try this WITHOUT esd running:
-
- dd bs=8k count=4 </dev/audio > sample.au
-
-
- Cthugha - An Oscilloscope on Acid
- ---------------------------------
-
- version 1.2:
-
- esd
- xcthugha --listen
- esdmon > /tmp/cthugha.com
-
- NOTE: xcthugha may complain about:
- Can't open `/dev/dsp' for writing. (16 - Device or resource busy)
- No problem, keep on truckin'. esd gets the sound device, and
- cthugha gets the data it needs.
-
- version 1.3:
-
- mkfifo /tmp/cthugha.esd
- xcthugha --play /tmp/cthugha.esd --silent &
- esdmon > /tmp/cthugha.esd
-
- ESD auto spawning:
- ------------------
-
- libesd will automaticall spawn esd if it's not available when an esd using
- application opens a connection to esd. By default the command issued is:
- esd -terminate -nobeeps -as 2
- BUT
- if you wish to use different options, you can set the
- ESD_SPAWN_OPTIONS
- environment variable that will contain the options passed to esd.
- for example - if I:
- export ESD_SPAWN_OPTIONS="-terminate -nobeeps"
- esd is run with:
- esd -terminate -nobeeps
-
- if you set the environment variable (contents are irrelevant) called
- ESD_NO_SPAWN
- libesd will not attempt to spawn esd. and simply fail to connect.
-
- You can also put these settings in $(sysconfdir)/esd.conf, or ~/.esd.conf.
- See $(sysconfdir)/esd.conf for an example of how to make the config file.
-