Merge pipewire-pulseaudio subtree

pipewire-pulseaudio/src/timeval.c

@@ -0,0 +1,220 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stddef.h>
+#include <sys/time.h>
+
+#ifdef HAVE_WINDOWS_H
+#include <windows.h>
+#endif
+
+#include <pulse/timeval.h>
+
+#include "internal.h"
+
+#define HAVE_GETTIMEOFDAY
+
+SPA_EXPORT
+struct timeval *pa_gettimeofday(struct timeval *tv) {
+    pa_assert(tv);
+
+#if defined(OS_IS_WIN32)
+    /*
+     * Copied from implementation by Steven Edwards (LGPL).
+     * Found on wine mailing list.
+     */
+#if defined(_MSC_VER) || defined(__BORLANDC__)
+#define EPOCHFILETIME (116444736000000000i64)
+#else
+#define EPOCHFILETIME (116444736000000000LL)
+#endif
+{
+    FILETIME ft;
+    LARGE_INTEGER li;
+    int64_t t;
+
+    GetSystemTimeAsFileTime(&ft);
+    li.LowPart  = ft.dwLowDateTime;
+    li.HighPart = ft.dwHighDateTime;
+    t  = li.QuadPart;       /* In 100-nanosecond intervals */
+    t -= EPOCHFILETIME;     /* Offset to the Epoch time */
+    t /= 10;                /* In microseconds */
+    tv->tv_sec  = (time_t) (t / PA_USEC_PER_SEC);
+    tv->tv_usec = (suseconds_t) (t % PA_USEC_PER_SEC);
+}
+#elif defined(HAVE_GETTIMEOFDAY)
+    pa_assert_se(gettimeofday(tv, NULL) == 0);
+#else
+#error "Platform lacks gettimeofday() or equivalent function."
+#endif
+
+    return tv;
+}
+
+SPA_EXPORT
+pa_usec_t pa_timeval_diff(const struct timeval *a, const struct timeval *b) {
+    pa_usec_t r;
+
+    pa_assert(a);
+    pa_assert(b);
+
+    /* Check which is the earlier time and swap the two arguments if required. */
+    if (PA_UNLIKELY(pa_timeval_cmp(a, b) < 0)) {
+        const struct timeval *c;
+        c = a;
+        a = b;
+        b = c;
+    }
+
+    /* Calculate the second difference*/
+    r = ((pa_usec_t) a->tv_sec - (pa_usec_t) b->tv_sec) * PA_USEC_PER_SEC;
+
+    /* Calculate the microsecond difference */
+    if (a->tv_usec > b->tv_usec)
+        r += (pa_usec_t) a->tv_usec - (pa_usec_t) b->tv_usec;
+    else if (a->tv_usec < b->tv_usec)
+        r -= (pa_usec_t) b->tv_usec - (pa_usec_t) a->tv_usec;
+
+    return r;
+}
+
+SPA_EXPORT
+int pa_timeval_cmp(const struct timeval *a, const struct timeval *b) {
+    pa_assert(a);
+    pa_assert(b);
+
+    if (a->tv_sec < b->tv_sec)
+        return -1;
+
+    if (a->tv_sec > b->tv_sec)
+        return 1;
+
+    if (a->tv_usec < b->tv_usec)
+        return -1;
+
+    if (a->tv_usec > b->tv_usec)
+        return 1;
+
+    return 0;
+}
+
+SPA_EXPORT
+pa_usec_t pa_timeval_age(const struct timeval *tv) {
+    struct timeval now;
+    pa_assert(tv);
+
+    return pa_timeval_diff(pa_gettimeofday(&now), tv);
+}
+
+SPA_EXPORT
+struct timeval* pa_timeval_add(struct timeval *tv, pa_usec_t v) {
+    time_t secs;
+    pa_assert(tv);
+
+    secs = (time_t) (v/PA_USEC_PER_SEC);
+
+    if (PA_UNLIKELY(tv->tv_sec > PA_INT_TYPE_MAX(time_t) - secs))
+        goto overflow;
+
+    tv->tv_sec += secs;
+    v -= (pa_usec_t) secs * PA_USEC_PER_SEC;
+    tv->tv_usec += (suseconds_t) v;
+
+    /* Normalize */
+    while ((pa_usec_t) tv->tv_usec >= PA_USEC_PER_SEC) {
+
+        if (PA_UNLIKELY(tv->tv_sec >= PA_INT_TYPE_MAX(time_t)))
+            goto overflow;
+
+        tv->tv_sec++;
+        tv->tv_usec -= (suseconds_t) PA_USEC_PER_SEC;
+    }
+
+    return tv;
+
+overflow:
+    tv->tv_sec = PA_INT_TYPE_MAX(time_t);
+    tv->tv_usec = (suseconds_t) (PA_USEC_PER_SEC-1);
+    return tv;
+}
+
+SPA_EXPORT
+struct timeval* pa_timeval_sub(struct timeval *tv, pa_usec_t v) {
+    time_t secs;
+    pa_assert(tv);
+
+    secs = (time_t) (v/PA_USEC_PER_SEC);
+
+    if (PA_UNLIKELY(tv->tv_sec < secs))
+        goto underflow;
+
+    tv->tv_sec -= secs;
+    v -= (pa_usec_t) secs * PA_USEC_PER_SEC;
+
+    if (tv->tv_usec >= (suseconds_t) v)
+        tv->tv_usec -= (suseconds_t) v;
+    else {
+
+        if (PA_UNLIKELY(tv->tv_sec <= 0))
+            goto underflow;
+
+        tv->tv_sec --;
+        tv->tv_usec += (suseconds_t) (PA_USEC_PER_SEC - v);
+    }
+
+    return tv;
+
+underflow:
+    tv->tv_sec = 0;
+    tv->tv_usec = 0;
+    return tv;
+}
+
+SPA_EXPORT
+struct timeval* pa_timeval_store(struct timeval *tv, pa_usec_t v) {
+    pa_assert(tv);
+
+    if (PA_UNLIKELY(v == PA_USEC_INVALID)) {
+        tv->tv_sec = PA_INT_TYPE_MAX(time_t);
+        tv->tv_usec = (suseconds_t) (PA_USEC_PER_SEC-1);
+
+        return tv;
+    }
+
+    tv->tv_sec = (time_t) (v / PA_USEC_PER_SEC);
+    tv->tv_usec = (suseconds_t) (v % PA_USEC_PER_SEC);
+
+    return tv;
+}
+
+SPA_EXPORT
+pa_usec_t pa_timeval_load(const struct timeval *tv) {
+
+    if (PA_UNLIKELY(!tv))
+        return PA_USEC_INVALID;
+
+    return
+        (pa_usec_t) tv->tv_sec * PA_USEC_PER_SEC +
+        (pa_usec_t) tv->tv_usec;
+}