FreeBSD/Linux Kernel Cross Reference
sys/dev/auconv.c

     /*      $NetBSD: auconv.c,v 1.10 2002/03/15 14:55:03 kent Exp $ */
     
     /*
      * Copyright (c) 1996 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the Computer Systems
     *      Engineering Group at Lawrence Berkeley Laboratory.
     * 4. Neither the name of the University nor of the Laboratory may be used
     *    to endorse or promote products derived from this software without
     *    specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: auconv.c,v 1.10 2002/03/15 14:55:03 kent Exp $");
    
    #include <sys/types.h>
    #include <sys/audioio.h>
    
    #include "auconv.h"
    
    void
    change_sign8(void *v, u_char *p, int cc)
    {
            while (--cc >= 0) {
                    *p ^= 0x80;
                    ++p;
            }
    }
    
    void
    change_sign16_le(void *v, u_char *p, int cc)
    {
            while ((cc -= 2) >= 0) {
                    p[1] ^= 0x80;
                    p += 2;
            }
    }
    
    void
    change_sign16_be(void *v, u_char *p, int cc)
    {
            while ((cc -= 2) >= 0) {
                    p[0] ^= 0x80;
                    p += 2;
            }
    }
    
    void
    swap_bytes(void *v, u_char *p, int cc)
    {
            u_char t;
    
            while ((cc -= 2) >= 0) {
                    t = p[0];
                    p[0] = p[1];
                    p[1] = t;
                    p += 2;
            }
    }
    
    void
    swap_bytes_change_sign16_le(void *v, u_char *p, int cc)
    {
            u_char t;
    
            while ((cc -= 2) >= 0) {
                    t = p[1];
                    p[1] = p[0] ^ 0x80;
                    p[0] = t;
                    p += 2;
            }
    }
    
    void
    swap_bytes_change_sign16_be(void *v, u_char *p, int cc)
   {
           u_char t;
   
           while ((cc -= 2) >= 0) {
                   t = p[0];
                   p[0] = p[1] ^ 0x80;
                   p[1] = t;
                   p += 2;
           }
   }
   
   void
   change_sign16_swap_bytes_le(void *v, u_char *p, int cc)
   {
           swap_bytes_change_sign16_be(v, p, cc);
   }
   
   void
   change_sign16_swap_bytes_be(void *v, u_char *p, int cc)
   {
           swap_bytes_change_sign16_le(v, p, cc);
   }
   
   void
   linear8_to_linear16_le(void *v, u_char *p, int cc)
   {
           u_char *q = p;
   
           p += cc;
           q += cc * 2;
           while (--cc >= 0) {
                   q -= 2;
                   q[1] = *--p;
                   q[0] = 0;
           }
   }
   
   void
   linear8_to_linear16_be(void *v, u_char *p, int cc)
   {
           u_char *q = p;
   
           p += cc;
           q += cc * 2;
           while (--cc >= 0) {
                   q -= 2;
                   q[0] = *--p;
                   q[1] = 0;
           }
   }
   
   void
   linear16_to_linear8_le(void *v, u_char *p, int cc)
   {
           u_char *q = p;
   
           while (--cc >= 0) {
                   *q++ = p[1];
                   p += 2;
           }
   }
   
   void
   linear16_to_linear8_be(void *v, u_char *p, int cc)
   {
           u_char *q = p;
   
           while (--cc >= 0) {
                   *q++ = p[0];
                   p += 2;
           }
   }
   
   void
   ulinear8_to_slinear16_le(void *v, u_char *p, int cc)
   {
           u_char *q = p;
   
           p += cc;
           q += cc * 2;
           while (--cc >= 0) {
                   q -= 2;
                   q[1] = *--p ^ 0x80;
                   q[0] = 0;
           }
   }
   
   void
   ulinear8_to_slinear16_be(void *v, u_char *p, int cc)
   {
           u_char *q = p;
   
           p += cc;
           q += cc * 2;
           while (--cc >= 0) {
                   q -= 2;
                   q[0] = *--p ^ 0x80;
                   q[1] = 0;
           }
   }
   
   void
   slinear16_to_ulinear8_le(void *v, u_char *p, int cc)
   {
           u_char *q = p;
   
           while (--cc >= 0) {
                   *q++ = p[1] ^ 0x80;
                   p += 2;
           }
   }
   
   void
   slinear16_to_ulinear8_be(void *v, u_char *p, int cc)
   {
           u_char *q = p;
   
           while (--cc >= 0) {
                   *q++ = p[0] ^ 0x80;
                   p += 2;
           }
   }

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