NAME

auplay, auhdr, raw2iaf, wav2iaf − basic audio output and conversion

SYNOPSIS

­auplay ­file ... 

­auhdr ­file ... 

­raw2iaf [ ­option ...  ] [ ­-o ­output ] ­input

­wav2iaf [ ­input ]

­wav2iaf

DESCRIPTION

­Auplay plays each ­file in turn on the audio device ­/dev/audio (see audio(3)), setting the device’s characteristics in ­/dev/audioctl to match those of the file. It uses ­stream (see sys-read(2)) to stream the data to the device at high priority. All files played must be in ‘Inferno audio format’, as defined by audio(6).

­Auhdr writes the header of each Inferno audio ­input file to the standard output.  The header describes the data in a form that can be written directly to /dev/audioctl to set the device’s characteristics. 

­Raw2iaf converts the ­input file, adds an appropriate header to describe the data in the Inferno format, and writes the result to the ­output file.  The options tell how the bytes in the input file should be interpreted:

­-8 rate is 8000 Hz

­-1 rate is 11025 Hz

­-2 rate is 22050 Hz

­-4 rate is 44100 Hz

­-m mono (one channel)

­-s stereo (two channels)

­-b each sample in each channel is one byte (unsigned)

­-w each sample in each channel is 16-bits (little-endian)

­-a input is a-law encoded

­-u input is μ-law encoded

­-p input is PCM encoded

­Wav2iaf reads the ­input file, which must be in Windows WAV format and encoded using PCM, and converts the data to Inferno format on the standard output. 

SOURCE

­/appl/cmd/auplay.b
­/appl/cmd/raw2iaf.b
­/appl/cmd/wav2iaf.b

SEE ALSO

sys-read(2), audio(3), audio(6)
 

Plan 9  —  June 07, 2000