avcodec/h263dec, mpeg4videodec: Parse extradata during init

Possible now that the IDCT is already initialized at this point.

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

libavcodec/h263dec.c

@@ -464,13 +464,6 @@ retry:
     } else if (CONFIG_MSMPEG4DEC && s->msmpeg4_version) {
         ret = ff_msmpeg4_decode_picture_header(s);
     } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
-        if (s->avctx->extradata_size && !s->extradata_parsed) {
-            GetBitContext gb;
-
-            if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
-                ff_mpeg4_decode_picture_header(avctx->priv_data, &gb, 1, 0);
-            s->extradata_parsed = 1;
-        }
         ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb, 0, 0);
         s->skipped_last_frame = (ret == FRAME_SKIPPED);
     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {

libavcodec/mpeg4videodec.c

@@ -42,6 +42,7 @@
 #include "h263.h"
 #include "h263data.h"
 #include "h263dec.h"
+#include "internal.h"
 #include "profiles.h"
 #include "qpeldsp.h"
 #include "threadframe.h"
@@ -3828,6 +3829,14 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     ff_thread_once(&init_static_once, mpeg4_init_static);
 
+    /* Must be after initializing the MPEG-4 static tables */
+    if (avctx->extradata_size && !avctx->internal->is_copy) {
+        GetBitContext gb;
+
+        if (init_get_bits8(&gb, avctx->extradata, avctx->extradata_size) >= 0)
+            ff_mpeg4_decode_picture_header(ctx, &gb, 1, 0);
+    }
+
     return 0;
 }
 

libavcodec/mpegvideo.h

@@ -114,7 +114,6 @@ typedef struct MpegEncContext {
     int input_picture_number;  ///< used to set pic->display_picture_number, should not be used for/by anything else
     int coded_picture_number;  ///< used to set pic->coded_picture_number, should not be used for/by anything else
     int picture_number;       //FIXME remove, unclear definition
-    int extradata_parsed;
     int picture_in_gop_number; ///< 0-> first pic in gop, ...
     int mb_width, mb_height;   ///< number of MBs horizontally & vertically
     int mb_stride;             ///< mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11