avcodec/mpegaudiodsp: Make ff_mpadsp_init() thread-safe

The only thing missing for this is to make ff_mpadsp_init_x86()
thread-safe; it currently isn't because a static table is initialized
every time ff_mpadsp_init() is called (when ARCH_X86 is true). Solve
this by initializing this table only once, namely together with the
ordinary not-arch specific tables. This also allows to reuse their AVOnce.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/libavcodec/mpegaudiodsp.c b/libavcodec/mpegaudiodsp.c
index 0a14ff549e..f03e244644 100644
--- a/libavcodec/mpegaudiodsp.c
+++ b/libavcodec/mpegaudiodsp.c
@@ -73,6 +73,9 @@ static av_cold void mpadsp_init_tabs(void)
             ff_mdct_win_fixed[j + 4][i + 1] = -ff_mdct_win_fixed[j][i + 1];
         }
     }
+
+    if (ARCH_X86)
+        ff_mpadsp_init_x86_tabs();
 }
 
 av_cold void ff_mpadsp_init(MPADSPContext *s)