diff options
Diffstat (limited to 'libOSC/OSC-timetag.c')
| -rw-r--r-- | libOSC/OSC-timetag.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/libOSC/OSC-timetag.c b/libOSC/OSC-timetag.c new file mode 100644 index 0000000..639eae9 --- /dev/null +++ b/libOSC/OSC-timetag.c @@ -0,0 +1,175 @@ +/*
+Copyright (c) 1998. The Regents of the University of California (Regents).
+All Rights Reserved.
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for educational, research, and not-for-profit purposes, without
+fee and without a signed licensing agreement, is hereby granted, provided that
+the above copyright notice, this paragraph and the following two paragraphs
+appear in all copies, modifications, and distributions. Contact The Office of
+Technology Licensing, UC Berkeley, 2150 Shattuck Avenue, Suite 510, Berkeley,
+CA 94720-1620, (510) 643-7201, for commercial licensing opportunities.
+
+Written by Matt Wright, The Center for New Music and Audio Technologies,
+University of California, Berkeley.
+
+ IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
+ SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
+ ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
+ REGENTS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ FOR A PARTICULAR PURPOSE. THE SOFTWARE AND ACCOMPANYING
+ DOCUMENTATION, IF ANY, PROVIDED HEREUNDER IS PROVIDED "AS IS".
+ REGENTS HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
+ ENHANCEMENTS, OR MODIFICATIONS.
+
+The OpenSound Control WWW page is
+ http://www.cnmat.berkeley.edu/OpenSoundControl
+*/
+
+/*
+
+ OSC_timeTag.c: library for manipulating OSC time tags
+ Matt Wright, 5/29/97
+
+ Version 0.2 (9/11/98): cleaned up so no explicit type names in the .c file.
+
+*/
+
+#include "OSC-timetag.h"
+
+
+#ifdef HAS8BYTEINT
+#define TWO_TO_THE_32_FLOAT 4294967296.0f
+
+OSCTimeTag OSCTT_Immediately(void) {
+ return (OSCTimeTag) 1;
+}
+
+OSCTimeTag OSCTT_BiggestPossibleTimeTag(void) {
+ return (OSCTimeTag) 0xffffffffffffffff;
+}
+
+OSCTimeTag OSCTT_PlusSeconds(OSCTimeTag original, float secondsOffset) {
+ int64 offset = (int64) (secondsOffset * TWO_TO_THE_32_FLOAT);
+
+/* printf("* OSCTT_PlusSeconds %llx plus %f seconds (i.e., %lld offset) is %llx\n", original,
+ secondsOffset, offset, original + offset); */
+
+ return original + offset;
+}
+
+int OSCTT_Compare(OSCTimeTag left, OSCTimeTag right) {
+#if 0
+ printf("***** OSCTT_Compare(%llx, %llx): %d\n", left, right,
+ (left<right) ? -1 : ((left == right) ? 0 : 1));
+#endif
+ if (left < right) {
+ return -1;
+ } else if (left == right) {
+ return 0;
+ } else {
+ return 1;
+ }
+}
+
+#ifdef __sgi
+#include <sys/time.h>
+
+#define SECONDS_FROM_1900_to_1970 2208988800 /* 17 leap years */
+#define TWO_TO_THE_32_OVER_ONE_MILLION 4295
+
+
+OSCTimeTag OSCTT_CurrentTime(void) {
+ uint64 result;
+ uint32 usecOffset;
+ struct timeval tv;
+ struct timezone tz;
+
+ BSDgettimeofday(&tv, &tz);
+
+ /* First get the seconds right */
+ result = (unsigned) SECONDS_FROM_1900_to_1970 +
+ (unsigned) tv.tv_sec -
+ (unsigned) 60 * tz.tz_minuteswest +
+ (unsigned) (tz.tz_dsttime ? 3600 : 0);
+
+#if 0
+ /* No timezone, no DST version ... */
+ result = (unsigned) SECONDS_FROM_1900_to_1970 +
+ (unsigned) tv.tv_sec;
+#endif
+
+
+ /* make seconds the high-order 32 bits */
+ result = result << 32;
+
+ /* Now get the fractional part. */
+ usecOffset = (unsigned) tv.tv_usec * (unsigned) TWO_TO_THE_32_OVER_ONE_MILLION;
+ /* printf("** %ld microsec is offset %x\n", tv.tv_usec, usecOffset); */
+
+ result += usecOffset;
+
+/* printf("* OSCTT_CurrentTime is %llx\n", result); */
+ return result;
+}
+
+#else /* __sgi */
+
+/* Instead of asking your operating system what time it is, it might be
+ clever to find out the current time at the instant your application
+ starts audio processing, and then keep track of the number of samples
+ output to know how much time has passed. */
+
+/* Loser version for systems that have no ability to tell the current time: */
+OSCTimeTag OSCTT_CurrentTime(void) {
+ return (OSCTimeTag) 1;
+}
+
+#endif /* __sgi */
+
+
+#else /* Not HAS8BYTEINT */
+
+OSCTimeTag OSCTT_CurrentTime(void) {
+ OSCTimeTag result;
+ result.seconds = 0;
+ result.fraction = 1;
+ return result;
+}
+
+OSCTimeTag OSCTT_BiggestPossibleTimeTag(void) {
+ OSCTimeTag result;
+ result.seconds = 0xffffffff;
+ result.fraction = 0xffffffff;
+ return result;
+}
+
+OSCTimeTag OSCTT_Immediately(void) {
+ OSCTimeTag result;
+ result.seconds = 0;
+ result.fraction = 1;
+ return result;
+}
+
+OSCTimeTag OSCTT_PlusSeconds(OSCTimeTag original, float secondsOffset) {
+ OSCTimeTag result;
+ result.seconds = 0;
+ result.fraction = 1;
+ return result;
+}
+
+int OSCTT_Compare(OSCTimeTag left, OSCTimeTag right) {
+ /* Untested! */
+ int highResult = left.seconds - right.seconds;
+
+ if (highResult != 0) return highResult;
+
+ return left.fraction - right.fraction;
+}
+
+
+#endif /* HAS8BYTEINT */
+
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