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Annotation of lucent/sys/man/3/audio, revision 1.1

1.1     ! root        1: .TH AUDIO 3 
        !             2: .SH NAME
        !             3: audio \- digital audio input and output
        !             4: .SH SYNOPSIS
        !             5: .nf
        !             6: .B bind -a #A /dev
        !             7: 
        !             8: .B /dev/audio
        !             9: .B /dev/volume
        !            10: .fi
        !            11: .SH DESCRIPTION
        !            12: .PP
        !            13: The audio device serves a one-level directory,
        !            14: giving access to the stereo audio ports.
        !            15: .B Audio
        !            16: is the data file, which can be read or written to use the port.
        !            17: Audio data is a sequence of stereo samples, left sample first.
        !            18: Each sample is a 16 bit little-endian two's complement integer;
        !            19: the default sampling rate is 44.1 kHz.
        !            20: Some implementations only support audio output
        !            21: and return a zero length when read.
        !            22: .PP
        !            23: .B Volume
        !            24: is the control file associated with the audio port.
        !            25: Each input and output source has an associated stereo volume control,
        !            26: ranging from 0 (quiet) to 100 (loud).
        !            27: In addition, there are controls for the sampling rate of the D/A and A/D converters
        !            28: and for any tone controls.
        !            29: Reads
        !            30: return lines of the form
        !            31: .IP
        !            32: .I source
        !            33: .B in\ left
        !            34: .I value 
        !            35: .B right
        !            36: .I value
        !            37: .B out\ left
        !            38: .I value
        !            39: .B right
        !            40: .I value
        !            41: .PP
        !            42: possibly abbreviated if the values are shared or non-existent.
        !            43: For example, if all of the values are shared, the form degenerates to
        !            44: .RI ` source
        !            45: .IR value '.
        !            46: Valid sources depend on the particular audio device,
        !            47: though all devices have a
        !            48: .B audio
        !            49: stereo source, which controls the output volume from the D/A converter
        !            50: connected to
        !            51: .BR audio .
        !            52: .PP
        !            53: Writes accept the same format with same abbreviations.
        !            54: Writing the string
        !            55: .B reset
        !            56: sets all of the attributes to their default value,
        !            57: and if no attribute is supplied,
        !            58: .B audio
        !            59: is assumed.
        !            60: .PP
        !            61: The Sound Blaster 16 (or MCD) is half-duplex and has the following controls.
        !            62: .TP
        !            63: .B audio out
        !            64: Data written to audio.
        !            65: .TP
        !            66: .B synth in out
        !            67: MIDI synthesizer.
        !            68: .TP
        !            69: .B cd in out
        !            70: CD player.
        !            71: .TP
        !            72: .B line in out
        !            73: Line-level input.
        !            74: .TP
        !            75: .B mic in out
        !            76: Monaural microphone input.
        !            77: .TP
        !            78: .B speaker in out
        !            79: Monaural internal speaker connection.
        !            80: .TP
        !            81: .B treb out
        !            82: Stereo treble tone control.
        !            83: Values less than 50 decrease the treble,
        !            84: those greater increase it.
        !            85: .TP
        !            86: .B bass out
        !            87: Stereo bass tone control.
        !            88: .TP
        !            89: .B speed in out
        !            90: Sampling rate for the D/A and A/D converters,
        !            91: expressed in Hz.
        !            92: Defaults to 44100.
        !            93: .PP
        !            94: Indigo audio is full-duplex and has the following controls.
        !            95: .TP
        !            96: .B audio out
        !            97: Data written to audio.
        !            98: .TP
        !            99: .B line in out
        !           100: Line-level input.
        !           101: .TP
        !           102: .B mic in out
        !           103: Microphone input.
        !           104: .TP
        !           105: .B aes in out
        !           106: Digital input.
        !           107: .PP
        !           108: Nextstation audio is output only and has the following controls.
        !           109: .TP
        !           110: .B audio
        !           111: Data written to audio.
        !           112: .TP
        !           113: .B deemp
        !           114: A
        !           115: .I value
        !           116: of zero turns off the stereo de-emphasis filter,
        !           117: any other value turns it on.
        !           118: .SH SOURCE
        !           119: .B /sys/src/9/*/devaudio.c

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