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 } 115