maplay-ulaw1
Play a layer i or layer ii mpeg audio stream
Part of maplay(1).
Usage
maplay [-v]
[-s]
[-l]
[-r]
[-us]
[-uh]
[-ul]
[-amd]
[-c]
[-f
ushort]
filename
maplay-ulaw [-v]
[-s]
[-l]
[-r]
[-us]
[-uh]
[-ul]
[-amd]
[-c]
[-f
ushort]
filename
Overview
The maplay program decodes layer I and layer II MPEG audio streams and plays them using a CD-quality audio device. It supports all modes, which are single channel, stereo, joint stereo and dual channel, and all bitrates except free mode.
The maplay-ulaw program decodes layer I and layer II MPEG audio streams and converts them to 8 bit u-law samples at a rate of 8 kHz, no matter what frequency the stream uses.
Options
- filename
-
filename of a MPEG audio stream or - for stdin
-
-h -
short help
-
-v -
verbose mode - Returns information about the stream, like mode, bitrate, and copyright.
-
-s -
stdout mode - Decodes the stream to stdout. The created output contains 16 bit signed PCM samples. The output of the maplay-ulaw program consists of 8 bit u-law samples at a 8 kHz rate. If the stream is in stereo mode, the samples of both channels are interleaved, the sample for the left channel first.
-
-l -
Decodes (and plays) the left channel of stereo streams only. This option halves the required CPU time.
-
-r -
Same as -l , but decodes the right channel only
-
-ul -
This option is available on machines with the dbri device and sends the audio output to the line out jack.
-
-amd -
Forces maplay to treat /dev/audio as an amd device. Use it if your SPARC clone has an amd device, but maplay doesn't recognize it. This option may also be used on a machine with a dbri device, because the dbri device can also produce u-law output.
-
-c -
Reports filter range violations to stderr. Sometimes PCM values calculated by the synthesis filter exceed the 16 bit boundary and must be mapped to these boundaries.
-
-f ushort -
Use this scalefactor instead of the default value 32768 for the synthesis filter. Range violations can be reduced or eliminated with this option, but lower scalefactor values reduce the signal-to-noise ratio, too.
Debian maintainer
Brian Mays <[email protected]>