Merge commit 'e1b66778'

* commit 'e1b66778':
  lavc: remove the locking code in avcodec_close()

Conflicts:
	libavcodec/utils.c

Note, if someone knows of a external codec lib/API, hwaccel or other that requires
locking on its close/free side, please contact ffmpeg-devel.
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/utils.c

@@ -2671,33 +2671,22 @@ av_cold int ff_codec_close_recursive(AVCodecContext *avctx)
 {
     int ret = 0;
 
-    ff_unlock_avcodec();
-
     ret = avcodec_close(avctx);
 
-    ff_lock_avcodec(NULL);
     return ret;
 }
 
 av_cold int avcodec_close(AVCodecContext *avctx)
 {
-    int ret;
-
     if (!avctx)
         return 0;
 
-    ret = ff_lock_avcodec(avctx);
-    if (ret < 0)
-        return ret;
-
     if (avcodec_is_open(avctx)) {
         FramePool *pool = avctx->internal->pool;
         int i;
         if (CONFIG_FRAME_THREAD_ENCODER &&
             avctx->internal->frame_thread_encoder && avctx->thread_count > 1) {
-            ff_unlock_avcodec();
             ff_frame_thread_encoder_free(avctx);
-            ff_lock_avcodec(avctx);
         }
         if (HAVE_THREADS && avctx->internal->thread_ctx)
             ff_thread_free(avctx);
@@ -2727,7 +2716,6 @@ av_cold int avcodec_close(AVCodecContext *avctx)
     avctx->codec = NULL;
     avctx->active_thread_type = 0;
 
-    ff_unlock_avcodec();
     return 0;
 }