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 #include <AudioStream.h>
28 #include <string.h>
29
30 // class AudioStream methods
31
32
33 // Constructor
34 AudioStream::
AudioStream(const char * path)35 AudioStream(
36 const char *path): // pathname
37 Audio(path), length(AUDIO_UNKNOWN_TIME)
38 {
39 }
40
41 // Set the header structure, even if it is already set
42 AudioError AudioStream::
updateheader(const AudioHdr & h)43 updateheader(
44 const AudioHdr& h) // new header to set
45 {
46 AudioError err;
47
48 // Validate the header before stuffing it in
49 err = h.Validate();
50 if (err != AUDIO_SUCCESS)
51 return (RaiseError(err));
52
53 // Copy in the new header
54 hdr = h;
55 return (AUDIO_SUCCESS);
56 }
57
58 // Set the header structure
59 AudioError AudioStream::
SetHeader(const AudioHdr & h)60 SetHeader(
61 const AudioHdr& h) // new header to set
62 {
63 // Once the header is set and the file is open, it cannot be changed
64 // XXX - hdrset test might be redundant?
65 if (hdrset() && opened())
66 return (RaiseError(AUDIO_ERR_NOEFFECT));
67
68 return (updateheader(h));
69 }
70
71 // Check the endian nature of the data, and change if necessary.
72 AudioError AudioStream::
coerceEndian(unsigned char * buf,size_t len,AudioEndian endian)73 coerceEndian(unsigned char *buf, size_t len,
74 AudioEndian endian)
75 {
76 // If the stream isn't endian sensitive, don't bother.
77 if (! isEndianSensitive())
78 return (AUDIO_SUCCESS);
79
80 if (hdr.endian == endian) {
81 #ifdef DEBUG
82 AUDIO_DEBUG((1, "AudioStream: endian swap not needed, byte"
83 "order OK.\n"));
84 #endif
85 return (AUDIO_SUCCESS);
86 }
87
88 // The endians don't match, lets swap bytes.
89 unsigned char chTemp;
90 for (int i = 0; i < len - 1; i += 2) {
91 chTemp = buf[i];
92 buf[i] = buf[i + 1];
93 buf[i+1] = chTemp;
94 }
95
96 #ifdef DEBUG
97 AUDIO_DEBUG((1, "AudioStream: converting endian.\n"));
98 // printf("AudioStream: converting endian.\n");
99 #endif
100 return (AUDIO_SUCCESS);
101 }
102
103 // This routine knows if the current format is endian sensitive.
isEndianSensitive() const104 Boolean AudioStream::isEndianSensitive() const
105 {
106
107 // Only these encodings have endian problems.
108 if (hdr.encoding == LINEAR || hdr.encoding == FLOAT)
109 return (TRUE);
110
111 return (FALSE);
112 }
113