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 36AudioStream:: 37AudioStream( 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 44AudioError AudioStream:: 45updateheader( 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 61AudioError AudioStream:: 62SetHeader( 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. 74AudioError AudioStream:: 75coerceEndian(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. 106Boolean 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