na_record - Online in the Cloud

PROGRAM:

NAME

na_record — record waveform from audio device

SYNOPSIS

na_record [-h] [-f sampling rate] [-audiodevice device] [-time seconds] [-o file]
[-otype type] [-ostype sample type] [-F sample rate] [-obo MSB | LSB | native]
[-oswap] [-p audio device protocol]

DESCRIPTION

na_record records digital audio data from the system's audio input device and writes it to
the specified file. It supports a variety of output file formats and native audio devices.

The following option flags are recognized:

-h Prints a short summary of usage to standard output.
-f sampling rate
Sets the input sampling rate (in samples per second, i.e. Hz). Not all devices
support all sampling rates, so it may be desireable to set this separately from
the output sampling rate.
-audiodevice device
Sets the audio device to record from, if supported by the audio protocol chosen
(e.g. /dev/dsp, /dev/audio)
-time seconds
Stops recording after the specified number of seconds.
-o file
Writes sound output to the specified file
-otype type
Specifies the file format to use for output. Supported types currently include
nist, est, dsps, snd, riff, aiff, audlab, raw, and ascii. The -h flag will show
the most accurate list. The default type is nist.
-F sampling rate
Sets the output sampling rate (again, in samples per second, i.e. Hz). If this
differs from the input sampling rate, resampling will be done. Defaults to
16000Hz.
-obo byte order
Sets the output byte order. Supported values are MSB, LSB, and native. Many file
formats have their own byte order, or are byte order independent, so this isn't
tremendously useful except for raw data. The default is the native byte order
for the system audio device.
-oswap
Swap bytes when saving to output.
-ostype sample type
Sets the sample type of the output. Suported values are short, mulaw, byte, or
ascii. Again, this is usually implied by the file format, so should only be used
for raw data. The default is short (i.e. 16-bit PCM).
-p audio device protocol
Selects an audio device protocol (i.e. type of audio device) to use. This
varies between different installations of Speech Tools, but defaults to the most
'native' audio device, usually Open Sound System on Linux and *BSD and
/dev/audio on Solaris.

ENVIRONMENT

NA_PLAY_PROTOCOL
Audio protocol to use (as in the -p flag)
NA_PLAY_HOST
Host to record audio from when using a network audio protocol.

EXAMPLES

To record five seconds of audio from /dev/dsp1 (on Linux) to foo.wav in RIFF format at
32kHz:
$ na_record -time 5 -audiodevice /dev/dsp1 -o foo.wav -otype RIFF -f 32000
To record one second of audio to bar.wav in raw format in 8kHz mu-law:
$ na_record -time 1 -o bar.wav -otype raw -ostype mulaw -f 8000

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