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:: 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:: 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:: 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:: 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. 104 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