[FFmpeg-cvslog] png: set AVFrame flags/fields before calling setup_finished().

[Ronald S. Bultje]

ffmpeg | branch: release/3.3 | Ronald S. Bultje <rsbultje at gmail.com> | Mon Apr  3 14:43:40 2017 -0400| [e90de50195d4b4b61f3c2c4ea3bb8a09b433de8e] | committer: Michael Niedermayer

png: set AVFrame flags/fields before calling setup_finished().

Fixes tsan warnings in fate-apng:

WARNING: ThreadSanitizer: data race (pid=51230)
  Read of size 4 at 0x7d50000042fc by main thread (mutexes: write M1000):
    #0 frame_copy_props frame.c:302 (ffmpeg:x86_64+0x1019a35d6)
[..]
  Previous write of size 4 at 0x7d50000042fc by thread T1 (mutexes: write M997):
    #0 decode_idat_chunk pngdec.c:708 (ffmpeg:x86_64+0x100f5562a)

(cherry picked from commit eff2861a757b8a46398e6fcb844b960b4775daad)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e90de50195d4b4b61f3c2c4ea3bb8a09b433de8e
---

 libavcodec/pngdec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index d184c34b81..102551972e 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -701,12 +701,12 @@ static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
             if ((ret = ff_thread_get_buffer(avctx, &s->previous_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
                 return ret;
         }
-        ff_thread_finish_setup(avctx);
-
         p->pict_type        = AV_PICTURE_TYPE_I;
         p->key_frame        = 1;
         p->interlaced_frame = !!s->interlace_type;
 
+        ff_thread_finish_setup(avctx);
+
         /* compute the compressed row size */
         if (!s->interlace_type) {
             s->crow_size = s->row_size + 1;