[FFmpeg-cvslog] avcodec/h261dec: Initialize IDCT context during init

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Mon Apr  5 02:42:18 2021 +0200| [5106fe85f71459f0f293019e682edec0c3c26cee] | committer: Andreas Rheinhardt

avcodec/h261dec: Initialize IDCT context during init

Before 998c9f15d1ca8c7489775ebcca51623b915988f1, initializing an
MpegEncContext's IDCT parts occured in ff_mpv_common_init() and this
has been called in h261_decode_frame(), not h261_decode_init().

Yet said commit factored this out of ff_mpv_common_init() and therefore
there is no reason any more not to set this during init as this commit
does.

Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5106fe85f71459f0f293019e682edec0c3c26cee
---

 libavcodec/h261dec.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/libavcodec/h261dec.c b/libavcodec/h261dec.c
index eb544e6046..0d8cd8c20d 100644
--- a/libavcodec/h261dec.c
+++ b/libavcodec/h261dec.c
@@ -79,6 +79,7 @@ static av_cold int h261_decode_init(AVCodecContext *avctx)
     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
 
     h->gob_start_code_skipped = 0;
+    ff_mpv_idct_init(s);
 
     ff_thread_once(&init_static_once, h261_decode_init_static);
 
@@ -595,10 +596,6 @@ static int h261_decode_frame(AVCodecContext *avctx, void *data,
 retry:
     init_get_bits(&s->gb, buf, buf_size * 8);
 
-    if (!s->context_initialized)
-        // we need the IDCT permutation for reading a custom matrix
-        ff_mpv_idct_init(s);
-
     ret = h261_decode_picture_header(h);
 
     /* skip if the header was thrashed */