usr/src/cmd/audio/utilities/AudioStream.cc

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1990-2001 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <AudioStream.h>
  30 #include <string.h>
  31
  32 // class AudioStream methods
  33
  34
  35 // Constructor
  36 AudioStream::
  37 AudioStream(
  38         const char      *path):                 // pathname
  39         Audio(path), length(AUDIO_UNKNOWN_TIME)
  40 {
  41 }
  42
  43 // Set the header structure, even if it is already set
  44 AudioError AudioStream::
  45 updateheader(
  46         const AudioHdr& h)                      // new header to set
  47 {
  48         AudioError      err;
  49
  50         // Validate the header before stuffing it in
  51         err = h.Validate();
  52         if (err != AUDIO_SUCCESS)
  53                 return (RaiseError(err));
  54
  55         // Copy in the new header
  56         hdr = h;
  57         return (AUDIO_SUCCESS);
  58 }
  59
  60 // Set the header structure
  61 AudioError AudioStream::
  62 SetHeader(
  63         const AudioHdr& h)                      // new header to set
  64 {
  65         // Once the header is set and the file is open, it cannot be changed
  66         // XXX - hdrset test might be redundant?
  67         if (hdrset() && opened())
  68                 return (RaiseError(AUDIO_ERR_NOEFFECT));
  69
  70         return (updateheader(h));
  71 }
  72
  73 // Check the endian nature of the data, and change if necessary.
  74 AudioError AudioStream::
  75 coerceEndian(unsigned char *buf, size_t len,
  76                     AudioEndian endian)
  77 {
  78         // If the stream isn't endian sensitive, don't bother.
  79         if (! isEndianSensitive())
  80                 return (AUDIO_SUCCESS);
  81
  82         if (hdr.endian == endian) {
  83 #ifdef DEBUG
  84                 AUDIO_DEBUG((1, "AudioStream: endian swap not needed, byte"
  85                     "order OK.\n"));
  86 #endif
  87                 return (AUDIO_SUCCESS);
  88         }
  89
  90         // The endians don't match, lets swap bytes.
  91         unsigned char chTemp;
  92         for (int i = 0; i < len - 1; i += 2) {
  93                 chTemp = buf[i];
  94                 buf[i] = buf[i + 1];
  95                 buf[i+1] = chTemp;
  96         }
  97
  98 #ifdef DEBUG
  99         AUDIO_DEBUG((1, "AudioStream: converting endian.\n"));
 100         // printf("AudioStream: converting endian.\n");
 101 #endif
 102         return (AUDIO_SUCCESS);
 103 }
 104
 105 // This routine knows if the current format is endian sensitive.
 106 Boolean AudioStream::isEndianSensitive() const
 107 {
 108
 109         // Only these encodings have endian problems.
 110         if (hdr.encoding == LINEAR || hdr.encoding == FLOAT)
 111                 return (TRUE);
 112
 113         return (FALSE);
 114 }