[FFmpeg-cvslog] avcodec/allcodecs: make avcodec_register_all thread safe

[Muhammad Faiz]

ffmpeg | branch: master | Muhammad Faiz <mfcc64 at gmail.com> | Tue Mar  7 15:51:12 2017 +0700| [e85e8408802dc3a474e6a610867df8e57c768339] | committer: Muhammad Faiz

avcodec/allcodecs: make avcodec_register_all thread safe

use ff_thread_once

Suggested-by: wm4 <nfxjfg at googlemail.com>
Signed-off-by: Muhammad Faiz <mfcc64 at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e85e8408802dc3a474e6a610867df8e57c768339
---

 libavcodec/allcodecs.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index a265ce5..074efd4 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -25,6 +25,7 @@
  */
 
 #include "config.h"
+#include "libavutil/thread.h"
 #include "avcodec.h"
 #include "version.h"
 
@@ -58,14 +59,8 @@
             av_register_codec_parser(&ff_##x##_parser);                 \
     }
 
-void avcodec_register_all(void)
+static void register_all(void)
 {
-    static int initialized;
-
-    if (initialized)
-        return;
-    initialized = 1;
-
     /* hardware accelerators */
     REGISTER_HWACCEL(H263_VAAPI,        h263_vaapi);
     REGISTER_HWACCEL(H263_VIDEOTOOLBOX, h263_videotoolbox);
@@ -718,3 +713,10 @@ void avcodec_register_all(void)
     REGISTER_PARSER(VP9,                vp9);
     REGISTER_PARSER(XMA,                xma);
 }
+
+void avcodec_register_all(void)
+{
+    static AVOnce control = AV_ONCE_INIT;
+
+    ff_thread_once(&control, register_all);
+}