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Annotation of driverkit/libDriver/Kernel/audio_mix.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: /*
        !            25:  * audio_mix.h
        !            26:  *
        !            27:  * Copyright (c) 1991, NeXT Computer, Inc.  All rights reserved.
        !            28:  *
        !            29:  *      Audio driver mixing prototypes.
        !            30:  *
        !            31:  * HISTORY
        !            32:  *      07/14/92/mtm    Original coding.
        !            33:  */
        !            34: 
        !            35: #import "audio_types.h"
        !            36: #import <bsd/sys/types.h>
        !            37: 
        !            38: extern void audio_swapSamples(short *src, short *dest, u_int count);
        !            39: extern void audio_twosComp8ToUnary(char *src, char *dest, u_int count);
        !            40: extern u_int audio_scaleSamples(char *src, char *dest, u_int count,
        !            41:                                IOAudioDataFormat format, u_int chanCount,
        !            42:                                int leftGain, int rightGain);
        !            43: extern void audio_resample22To44(char *src, char *dest, u_int count,
        !            44:                                 IOAudioDataFormat format, u_int channelCount);
        !            45: extern void audio_resample44To22(char *src, char *dest, u_int count,
        !            46:                                 IOAudioDataFormat format, u_int *phase);
        !            47: extern void audio_convertMonoToStereo(char *src, char *dest, u_int count,
        !            48:                                      IOAudioDataFormat format);
        !            49: extern void audio_convertStereoToMono(char *src, char *dest, u_int count,
        !            50:                                      IOAudioDataFormat format, u_int *phase);
        !            51: extern void audio_convertLinear8ToLinear16(char *src, short *dest,
        !            52:                                           u_int count);
        !            53: extern void audio_convertLinear8ToMulaw8(char *src, char *dest, u_int count);
        !            54: extern void audio_convertLinear16ToLinear8(short *src, char *dest, u_int count,
        !            55:                                           u_int *phase);
        !            56: extern void audio_convertLinear16ToMulaw8(short *src, char *dest, u_int count,
        !            57:                                          u_int *phase);
        !            58: extern void audio_convertMulaw8ToLinear16(char *src, short *dest, u_int count);
        !            59: extern void audio_convertMulaw8ToLinear8(char *src, char *dest, u_int count);
        !            60: extern u_int audio_mix(char *src, char *dest, u_int count,
        !            61:                       IOAudioDataFormat format, boolean_t virgin);

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