1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 1989-2002 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate /* 30*0Sstevel@tonic-gate * Miscellaneous audio-related operations. 31*0Sstevel@tonic-gate */ 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate #include <stdio.h> 34*0Sstevel@tonic-gate #include <string.h> 35*0Sstevel@tonic-gate #include <math.h> 36*0Sstevel@tonic-gate 37*0Sstevel@tonic-gate #include <libaudio_impl.h> 38*0Sstevel@tonic-gate #include <audio_errno.h> 39*0Sstevel@tonic-gate #include <audio_hdr.h> 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate /* 42*0Sstevel@tonic-gate * Convert a byte count into a floating-point time value, in seconds, 43*0Sstevel@tonic-gate * using the encoding specified in the given audio header structure. 44*0Sstevel@tonic-gate * Note that the byte count is not the same as the offset in an audio file, 45*0Sstevel@tonic-gate * since the size of the audio file header is not taken into account. 46*0Sstevel@tonic-gate */ 47*0Sstevel@tonic-gate double 48*0Sstevel@tonic-gate audio_bytes_to_secs(Audio_hdr *hp, unsigned int cnt) 49*0Sstevel@tonic-gate { 50*0Sstevel@tonic-gate return ((double)cnt / 51*0Sstevel@tonic-gate ((double)(hp->channels * hp->bytes_per_unit * hp->sample_rate) / 52*0Sstevel@tonic-gate (double)hp->samples_per_unit)); 53*0Sstevel@tonic-gate } 54*0Sstevel@tonic-gate 55*0Sstevel@tonic-gate /* 56*0Sstevel@tonic-gate * Convert a floating-point time value, in seconds, to a byte count for 57*0Sstevel@tonic-gate * the audio encoding in the given audio header. Note that the byte count 58*0Sstevel@tonic-gate * is not the same as the offset in an audio file, since the size of the 59*0Sstevel@tonic-gate * audio file header is not taken into account. 60*0Sstevel@tonic-gate */ 61*0Sstevel@tonic-gate unsigned 62*0Sstevel@tonic-gate audio_secs_to_bytes(Audio_hdr *hp, double sec) 63*0Sstevel@tonic-gate { 64*0Sstevel@tonic-gate unsigned offset; 65*0Sstevel@tonic-gate 66*0Sstevel@tonic-gate offset = (unsigned)(0.5 + (sec * 67*0Sstevel@tonic-gate ((double)(hp->channels * hp->bytes_per_unit * hp->sample_rate) / 68*0Sstevel@tonic-gate (double)hp->samples_per_unit))); 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate /* Round down to the start of the nearest sample frame */ 71*0Sstevel@tonic-gate offset -= (offset % (hp->bytes_per_unit * hp->channels)); 72*0Sstevel@tonic-gate return (offset); 73*0Sstevel@tonic-gate } 74*0Sstevel@tonic-gate 75*0Sstevel@tonic-gate /* 76*0Sstevel@tonic-gate * Convert an ASCII time value (hh:mm:ss.dd) into floating-point seconds. 77*0Sstevel@tonic-gate * Returns value if successfully converted. Otherwise, returns HUGE_VAL. 78*0Sstevel@tonic-gate * 79*0Sstevel@tonic-gate * XXX - currently allows the ridiculous construct: 5.3E3:-47.3E-1:17.3 80*0Sstevel@tonic-gate */ 81*0Sstevel@tonic-gate double 82*0Sstevel@tonic-gate audio_str_to_secs(char *str) 83*0Sstevel@tonic-gate { 84*0Sstevel@tonic-gate double val; 85*0Sstevel@tonic-gate char *str2; 86*0Sstevel@tonic-gate 87*0Sstevel@tonic-gate val = strtod(str, &str2); /* get first numeric field */ 88*0Sstevel@tonic-gate if (str2 == str) 89*0Sstevel@tonic-gate return (HUGE_VAL); 90*0Sstevel@tonic-gate 91*0Sstevel@tonic-gate if (*str2 == ':') { /* that was hours (or minutes) */ 92*0Sstevel@tonic-gate val *= 60.; 93*0Sstevel@tonic-gate str = str2 + 1; 94*0Sstevel@tonic-gate val += strtod(str, &str2); /* another field is required */ 95*0Sstevel@tonic-gate if (str2 == str) 96*0Sstevel@tonic-gate return (HUGE_VAL); 97*0Sstevel@tonic-gate } 98*0Sstevel@tonic-gate 99*0Sstevel@tonic-gate if (*str2 == ':') { /* converted hours and minutes */ 100*0Sstevel@tonic-gate val *= 60.; 101*0Sstevel@tonic-gate str = str2 + 1; 102*0Sstevel@tonic-gate val += strtod(str, &str2); /* another field is required */ 103*0Sstevel@tonic-gate if (str2 == str) 104*0Sstevel@tonic-gate return (HUGE_VAL); 105*0Sstevel@tonic-gate } 106*0Sstevel@tonic-gate 107*0Sstevel@tonic-gate if (*str2 != '\0') 108*0Sstevel@tonic-gate return (HUGE_VAL); 109*0Sstevel@tonic-gate return (val); 110*0Sstevel@tonic-gate } 111*0Sstevel@tonic-gate 112*0Sstevel@tonic-gate /* 113*0Sstevel@tonic-gate * Convert floating-point seconds into an ASCII time value (hh:mm:ss.dd). 114*0Sstevel@tonic-gate * 115*0Sstevel@tonic-gate * HUGE_VAL is converted to 0:00. 'Precision' specifies the maximum 116*0Sstevel@tonic-gate * number of digits after the decimal point (-1 allows the max). 117*0Sstevel@tonic-gate * 118*0Sstevel@tonic-gate * Store the resulting string in the specified buffer (must be at least 119*0Sstevel@tonic-gate * AUDIO_MAX_TIMEVAL bytes long). The string address is returned. 120*0Sstevel@tonic-gate */ 121*0Sstevel@tonic-gate char * 122*0Sstevel@tonic-gate audio_secs_to_str(double sec, char *str, int precision) 123*0Sstevel@tonic-gate { 124*0Sstevel@tonic-gate char *p; 125*0Sstevel@tonic-gate unsigned ovflow; 126*0Sstevel@tonic-gate int hours; 127*0Sstevel@tonic-gate double x; 128*0Sstevel@tonic-gate char buf[64]; 129*0Sstevel@tonic-gate 130*0Sstevel@tonic-gate if (sec == HUGE_VAL) { 131*0Sstevel@tonic-gate (void) strcpy(str, "0:00"); 132*0Sstevel@tonic-gate return (str); 133*0Sstevel@tonic-gate } 134*0Sstevel@tonic-gate 135*0Sstevel@tonic-gate /* Limit precision arg to reasonable value */ 136*0Sstevel@tonic-gate if ((precision > 10) || (precision < 0)) 137*0Sstevel@tonic-gate precision = 10; 138*0Sstevel@tonic-gate 139*0Sstevel@tonic-gate /* If negative, write a minus sign and get on with it. */ 140*0Sstevel@tonic-gate p = str; 141*0Sstevel@tonic-gate if (sec < 0.) { 142*0Sstevel@tonic-gate sec = -sec; 143*0Sstevel@tonic-gate 144*0Sstevel@tonic-gate /* Round off within precision to avoid -.01 printing as -0:00 */ 145*0Sstevel@tonic-gate (void) sprintf(buf, "%.*f", precision, sec); 146*0Sstevel@tonic-gate (void) sscanf(buf, "%lf", &sec); 147*0Sstevel@tonic-gate if (sec > 0.) 148*0Sstevel@tonic-gate *p++ = '-'; 149*0Sstevel@tonic-gate } 150*0Sstevel@tonic-gate 151*0Sstevel@tonic-gate /* Round off within precision to avoid 1:59.999 printing as 1:60.00 */ 152*0Sstevel@tonic-gate x = fmod(sec, 60.); 153*0Sstevel@tonic-gate sec -= x; 154*0Sstevel@tonic-gate (void) sprintf(buf, "%.*f", precision, x); 155*0Sstevel@tonic-gate (void) sscanf(buf, "%lf", &x); 156*0Sstevel@tonic-gate sec += x; 157*0Sstevel@tonic-gate 158*0Sstevel@tonic-gate if (sec >= 60.) { 159*0Sstevel@tonic-gate /* Extract minutes */ 160*0Sstevel@tonic-gate ovflow = ((unsigned)sec) / 60; 161*0Sstevel@tonic-gate sec -= (double)(ovflow * 60); 162*0Sstevel@tonic-gate hours = (ovflow >= 60); 163*0Sstevel@tonic-gate if (hours) { 164*0Sstevel@tonic-gate /* convert hours */ 165*0Sstevel@tonic-gate (void) sprintf(p, "%d:", ovflow / 60); 166*0Sstevel@tonic-gate p = &p[strlen(p)]; 167*0Sstevel@tonic-gate ovflow %= 60; 168*0Sstevel@tonic-gate } 169*0Sstevel@tonic-gate /* convert minutes (use two digits if hours printed) */ 170*0Sstevel@tonic-gate (void) sprintf(p, "%0*d:", (hours ? 2 : 1), ovflow); 171*0Sstevel@tonic-gate p = &p[strlen(p)]; 172*0Sstevel@tonic-gate } else { 173*0Sstevel@tonic-gate *p++ = '0'; 174*0Sstevel@tonic-gate *p++ = ':'; 175*0Sstevel@tonic-gate } 176*0Sstevel@tonic-gate 177*0Sstevel@tonic-gate if (sec < 10.) 178*0Sstevel@tonic-gate *p++ = '0'; 179*0Sstevel@tonic-gate (void) sprintf(p, "%.*f", precision, sec); 180*0Sstevel@tonic-gate return (str); 181*0Sstevel@tonic-gate } 182*0Sstevel@tonic-gate 183*0Sstevel@tonic-gate /* 184*0Sstevel@tonic-gate * Compare the encoding fields of two audio headers. 185*0Sstevel@tonic-gate * Return 0 if they are the same, 1 if they are the same except for 186*0Sstevel@tonic-gate * sample rate, else -1. 187*0Sstevel@tonic-gate */ 188*0Sstevel@tonic-gate int 189*0Sstevel@tonic-gate audio_cmp_hdr(Audio_hdr *h1, Audio_hdr *h2) 190*0Sstevel@tonic-gate { 191*0Sstevel@tonic-gate if ((h1->encoding != h2->encoding) || 192*0Sstevel@tonic-gate (h1->bytes_per_unit != h2->bytes_per_unit) || 193*0Sstevel@tonic-gate (h1->channels != h2->channels) || 194*0Sstevel@tonic-gate (h1->samples_per_unit != h2->samples_per_unit)) 195*0Sstevel@tonic-gate return (-1); 196*0Sstevel@tonic-gate 197*0Sstevel@tonic-gate if (h1->sample_rate != h2->sample_rate) 198*0Sstevel@tonic-gate return (1); 199*0Sstevel@tonic-gate 200*0Sstevel@tonic-gate return (0); 201*0Sstevel@tonic-gate } 202*0Sstevel@tonic-gate 203*0Sstevel@tonic-gate /* 204*0Sstevel@tonic-gate * Interpret the encoding information in the specified header 205*0Sstevel@tonic-gate * and return an appropriate string in the supplied buffer. 206*0Sstevel@tonic-gate * The buffer should contain at least AUDIO_MAX_ENCODE_INFO bytes. 207*0Sstevel@tonic-gate * The returned string is something like: 208*0Sstevel@tonic-gate * "stereo 16-bit linear PCM @ 44.1kHz" 209*0Sstevel@tonic-gate * 210*0Sstevel@tonic-gate * Returns AUDIO_ERR_BADHDR if the header cannot be interpreted. 211*0Sstevel@tonic-gate */ 212*0Sstevel@tonic-gate int 213*0Sstevel@tonic-gate audio_enc_to_str(Audio_hdr *hdrp, char *str) 214*0Sstevel@tonic-gate { 215*0Sstevel@tonic-gate char *chan; 216*0Sstevel@tonic-gate char *prec; 217*0Sstevel@tonic-gate char *enc; 218*0Sstevel@tonic-gate char cbuf[AUDIO_MAX_ENCODE_INFO]; 219*0Sstevel@tonic-gate char pbuf[AUDIO_MAX_ENCODE_INFO]; 220*0Sstevel@tonic-gate char sbuf[AUDIO_MAX_ENCODE_INFO]; 221*0Sstevel@tonic-gate int err; 222*0Sstevel@tonic-gate 223*0Sstevel@tonic-gate err = AUDIO_SUCCESS; 224*0Sstevel@tonic-gate 225*0Sstevel@tonic-gate switch (hdrp->channels) { 226*0Sstevel@tonic-gate case 0: 227*0Sstevel@tonic-gate chan = "(zero channels?)"; 228*0Sstevel@tonic-gate err = AUDIO_ERR_BADHDR; 229*0Sstevel@tonic-gate break; 230*0Sstevel@tonic-gate case 1: 231*0Sstevel@tonic-gate chan = "mono"; break; 232*0Sstevel@tonic-gate case 2: 233*0Sstevel@tonic-gate chan = "stereo"; break; 234*0Sstevel@tonic-gate case 4: 235*0Sstevel@tonic-gate chan = "quad"; break; 236*0Sstevel@tonic-gate default: 237*0Sstevel@tonic-gate chan = pbuf; 238*0Sstevel@tonic-gate (void) sprintf(cbuf, "%u-channel", hdrp->channels); break; 239*0Sstevel@tonic-gate } 240*0Sstevel@tonic-gate 241*0Sstevel@tonic-gate switch (hdrp->encoding) { 242*0Sstevel@tonic-gate case AUDIO_ENCODING_ULAW: 243*0Sstevel@tonic-gate enc = "u-law"; 244*0Sstevel@tonic-gate goto pcm; 245*0Sstevel@tonic-gate case AUDIO_ENCODING_ALAW: 246*0Sstevel@tonic-gate enc = "A-law"; 247*0Sstevel@tonic-gate goto pcm; 248*0Sstevel@tonic-gate case AUDIO_ENCODING_LINEAR: 249*0Sstevel@tonic-gate enc = "linear PCM"; 250*0Sstevel@tonic-gate goto pcm; 251*0Sstevel@tonic-gate case AUDIO_ENCODING_FLOAT: 252*0Sstevel@tonic-gate enc = "floating-point"; 253*0Sstevel@tonic-gate pcm: 254*0Sstevel@tonic-gate if (hdrp->samples_per_unit != 1) 255*0Sstevel@tonic-gate goto unknown; 256*0Sstevel@tonic-gate prec = pbuf; 257*0Sstevel@tonic-gate (void) sprintf(pbuf, "%u-bit", hdrp->bytes_per_unit * 8); 258*0Sstevel@tonic-gate break; 259*0Sstevel@tonic-gate 260*0Sstevel@tonic-gate default: 261*0Sstevel@tonic-gate unknown: 262*0Sstevel@tonic-gate err = AUDIO_ERR_ENCODING; 263*0Sstevel@tonic-gate enc = "(unknown encoding?)"; 264*0Sstevel@tonic-gate if (hdrp->samples_per_unit != 0) { 265*0Sstevel@tonic-gate prec = pbuf; 266*0Sstevel@tonic-gate (void) sprintf(pbuf, "%f-bit", 267*0Sstevel@tonic-gate (double)(hdrp->bytes_per_unit * 8) / 268*0Sstevel@tonic-gate (double)hdrp->samples_per_unit); 269*0Sstevel@tonic-gate } else { 270*0Sstevel@tonic-gate prec = "(unknown precision?)"; 271*0Sstevel@tonic-gate err = AUDIO_ERR_BADHDR; 272*0Sstevel@tonic-gate } 273*0Sstevel@tonic-gate } 274*0Sstevel@tonic-gate 275*0Sstevel@tonic-gate (void) sprintf(sbuf, "%.3fkHz", ((double)hdrp->sample_rate / 1000.)); 276*0Sstevel@tonic-gate (void) sprintf(str, "%s %s %s @ %s", chan, prec, enc, sbuf); 277*0Sstevel@tonic-gate return (err); 278*0Sstevel@tonic-gate } 279