diff --git a/doc/APIchanges b/doc/APIchanges
index 4229453b9bcc153648c479cfd7a7547cc465ae7f..f7279c6c52b7e9d5dbf8f7e109fea0b62120d315 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,6 +13,9 @@ libavutil: 2012-10-22
API changes, most recent first:
+2013-xx-xx - xxxxxxx - lavu 52.12.0 - cpu.h
+ Add av_cpu_count() function for getting the number of logical CPUs.
+
2013-05-xx - xxxxxxx - lavc 55.7.0 - avcodec.h
Add picture_structure to AVCodecParserContext.
diff --git a/libavcodec/pthread.c b/libavcodec/pthread.c
index 7eac335f74128036eb764d92fc853e3f46df5610..152335358019ee9aca492722cde6eee41053f2ae 100644
--- a/libavcodec/pthread.c
+++ b/libavcodec/pthread.c
@@ -31,29 +31,12 @@
#include "config.h"
-#if HAVE_SCHED_GETAFFINITY
-#define _GNU_SOURCE
-#include <sched.h>
-#endif
-#if HAVE_GETPROCESSAFFINITYMASK
-#include <windows.h>
-#endif
-#if HAVE_SYSCTL
-#if HAVE_SYS_PARAM_H
-#include <sys/param.h>
-#endif
-#include <sys/types.h>
-#include <sys/sysctl.h>
-#endif
-#if HAVE_SYSCONF
-#include <unistd.h>
-#endif
-
#include "avcodec.h"
#include "internal.h"
#include "thread.h"
#include "libavutil/avassert.h"
#include "libavutil/common.h"
+#include "libavutil/cpu.h"
#if HAVE_PTHREADS
#include <pthread.h>
@@ -153,40 +136,6 @@ typedef struct FrameThreadContext {
* limit the number of threads to 16 for automatic detection */
#define MAX_AUTO_THREADS 16
-static int get_logical_cpus(AVCodecContext *avctx)
-{
- int ret, nb_cpus = 1;
-#if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
- cpu_set_t cpuset;
-
- CPU_ZERO(&cpuset);
-
- ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
- if (!ret) {
- nb_cpus = CPU_COUNT(&cpuset);
- }
-#elif HAVE_GETPROCESSAFFINITYMASK
- DWORD_PTR proc_aff, sys_aff;
- ret = GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff);
- if (ret)
- nb_cpus = av_popcount64(proc_aff);
-#elif HAVE_SYSCTL && defined(HW_NCPU)
- int mib[2] = { CTL_HW, HW_NCPU };
- size_t len = sizeof(nb_cpus);
-
- ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
- if (ret == -1)
- nb_cpus = 0;
-#elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
- nb_cpus = sysconf(_SC_NPROC_ONLN);
-#elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
- nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
-#endif
- av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
- return nb_cpus;
-}
-
-
static void* attribute_align_arg worker(void *v)
{
AVCodecContext *avctx = v;
@@ -292,7 +241,8 @@ static int thread_init(AVCodecContext *avctx)
int thread_count = avctx->thread_count;
if (!thread_count) {
- int nb_cpus = get_logical_cpus(avctx);
+ int nb_cpus = av_cpu_count();
+ av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
@@ -790,7 +740,8 @@ static int frame_thread_init(AVCodecContext *avctx)
int i, err = 0;
if (!thread_count) {
- int nb_cpus = get_logical_cpus(avctx);
+ int nb_cpus = av_cpu_count();
+ av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
diff --git a/libavutil/cpu.c b/libavutil/cpu.c
index 23016d68a9b55dcd20e11d56ee104b408358458c..b95158b054b58d14bef3f66ba2871bebde168f93 100644
--- a/libavutil/cpu.c
+++ b/libavutil/cpu.c
@@ -20,6 +20,24 @@
#include "config.h"
#include "opt.h"
+#if HAVE_SCHED_GETAFFINITY
+#define _GNU_SOURCE
+#include <sched.h>
+#endif
+#if HAVE_GETPROCESSAFFINITYMASK
+#include <windows.h>
+#endif
+#if HAVE_SYSCTL
+#if HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
+#if HAVE_SYSCONF
+#include <unistd.h>
+#endif
+
static int cpuflags_mask = -1, checked;
int av_get_cpu_flags(void)
@@ -109,6 +127,39 @@ int av_parse_cpu_flags(const char *s)
return flags & INT_MAX;
}
+int av_cpu_count(void)
+{
+ int ret, nb_cpus = 1;
+#if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
+ cpu_set_t cpuset;
+
+ CPU_ZERO(&cpuset);
+
+ ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
+ if (!ret) {
+ nb_cpus = CPU_COUNT(&cpuset);
+ }
+#elif HAVE_GETPROCESSAFFINITYMASK
+ DWORD_PTR proc_aff, sys_aff;
+ ret = GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff);
+ if (ret)
+ nb_cpus = av_popcount64(proc_aff);
+#elif HAVE_SYSCTL && defined(HW_NCPU)
+ int mib[2] = { CTL_HW, HW_NCPU };
+ size_t len = sizeof(nb_cpus);
+
+ ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
+ if (ret == -1)
+ nb_cpus = 0;
+#elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
+ nb_cpus = sysconf(_SC_NPROC_ONLN);
+#elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
+ nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+#endif
+
+ return nb_cpus;
+}
+
#ifdef TEST
#include <stdio.h>
diff --git a/libavutil/cpu.h b/libavutil/cpu.h
index 4929512c66f37458cb1d50c7e1829d3783505237..f2c9c0f20e04062282400f1ba185541485630337 100644
--- a/libavutil/cpu.h
+++ b/libavutil/cpu.h
@@ -76,6 +76,11 @@ void av_set_cpu_flags_mask(int mask);
*/
int av_parse_cpu_flags(const char *s);
+/**
+ * @return the number of logical CPU cores present.
+ */
+int av_cpu_count(void);
+
/* The following CPU-specific functions shall not be called directly. */
int ff_get_cpu_flags_arm(void);
int ff_get_cpu_flags_ppc(void);
diff --git a/libavutil/version.h b/libavutil/version.h
index 066c06160f8a4d7c85e8931144786014e62d103b..9f0a976d9f2b35bd8d523ce5da7bee97e4cbbe49 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -37,7 +37,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 52
-#define LIBAVUTIL_VERSION_MINOR 11
+#define LIBAVUTIL_VERSION_MINOR 12
#define LIBAVUTIL_VERSION_MICRO 0
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \