A terminal utilty for recording raw audio with a circular prerecord buffer.
Usage
cbuffer [-b [BITRATE]] [SECONDS]
-b, --bitrate <BITRATE> [default: 1411200]
-h, --help Print help information
-V, --version Print version information
Dependencies
rust/cargo 1.60.0
pulseaudio (optional)
Buffers stdin for specified number of seconds and starts writing to stdout when a key is pressed. q or ctrl-c will stop the program, any other key will toggle between recording and buffering. Specify the bitrate so the program can determine how much data constitutes a full second (default is for 16-bit 44.1k 2ch audio).
You could theoretically use this program to record other types of lossless, headerless data in the same manner.
crecord [-hf] [-b buffer_seconds] [-s pulse_sink] filename
Included is a bash script crecord which will read from a specified pulseaudio
sink using SoX and write to a file. -b specifies buffer size in seconds, -s
specifies pulse source, -f forces overwrite of an existing file.
make
make install
This will install both cbuffer and the crecord script into $PREFIX/bin.
bit rate = sample rate * bit depth * channels
Record raw samples using arecord and redirect to file:
arecord -traw -c2 -fS16_LE -r44100 - | cbuffer -b 1411200 > test.raw
Play back using aplay with same arguments:
aplay -traw -c2 -fS16_LE -r44100 test.raw
Or use something like SoX to insert a WAV header:
sox -q -t pulseaudio default.monitor -t raw -L -esigned-integer -r44100 -b16 -c2 - | \
cbuffer -b 1411200 5 | \
sox -t raw -L -esigned-integer -r44100 -b16 -c2 - test.wav