mpeg4videodec: move intra_dc_threshold from MpegEncContext to Mpeg4DecContext

libavcodec/mpeg4video.h

@@ -84,6 +84,8 @@ typedef struct Mpeg4DecContext {
     int enhancement_type;
     int scalability;
     int use_intra_dc_vlc;
+    ///< QP above whch the ac VLC should be used for intra dc
+    int intra_dc_threshold;
 
     /* bug workarounds */
     int divx_version;

libavcodec/mpeg4videodec.c

@@ -1179,7 +1179,7 @@ static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
     mb_type = s->current_picture.mb_type[xy];
     cbp     = s->cbp_table[xy];
 
-    ctx->use_intra_dc_vlc = s->qscale < s->intra_dc_threshold;
+    ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
 
     if (s->current_picture.qscale_table[xy] != s->qscale)
         ff_set_qscale(s, s->current_picture.qscale_table[xy]);
@@ -1577,7 +1577,7 @@ intra:
         }
         cbp = (cbpc & 3) | (cbpy << 2);
 
-        ctx->use_intra_dc_vlc = s->qscale < s->intra_dc_threshold;
+        ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
 
         if (dquant)
             ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
@@ -2180,7 +2180,7 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
         if (s->pict_type == AV_PICTURE_TYPE_B)
             skip_bits_long(gb, ctx->cplx_estimation_trash_b);
 
-        s->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
+        ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
         if (!s->progressive_sequence) {
             s->top_field_first = get_bits1(gb);
             s->alternate_scan  = get_bits1(gb);
@@ -2245,7 +2245,7 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
                    s->data_partitioning, ctx->resync_marker,
                    ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
                    1 - s->no_rounding, s->vo_type,
-                   s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold,
+                   s->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
                    ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
                    ctx->cplx_estimation_trash_b);
         }

libavcodec/mpegvideo.h

@@ -592,7 +592,6 @@ typedef struct MpegEncContext {
     int low_delay;                   ///< no reordering needed / has no b-frames
     int vo_type;
     int vol_control_parameters;      ///< does the stream contain the low_delay flag, used to workaround buggy encoders
-    int intra_dc_threshold;          ///< QP above whch the ac VLC should be used for intra dc
     PutBitContext tex_pb;            ///< used for data partitioned VOPs
     PutBitContext pb2;               ///< used for data partitioned VOPs
     int mpeg_quant;

libavcodec/vaapi_mpeg4.c

@@ -25,7 +25,7 @@
 #include "mpeg4video.h"
 
 /** Reconstruct bitstream intra_dc_vlc_thr */
-static int mpeg4_get_intra_dc_vlc_thr(MpegEncContext *s)
+static int mpeg4_get_intra_dc_vlc_thr(Mpeg4DecContext *s)
 {
     switch (s->intra_dc_threshold) {
     case 99: return 0;
@@ -83,7 +83,7 @@ static int vaapi_mpeg4_start_frame(AVCodecContext *avctx, av_unused const uint8_
     pic_param->vop_fields.bits.vop_coding_type          = s->pict_type - AV_PICTURE_TYPE_I;
     pic_param->vop_fields.bits.backward_reference_vop_coding_type = s->pict_type == AV_PICTURE_TYPE_B ? s->next_picture.f.pict_type - AV_PICTURE_TYPE_I : 0;
     pic_param->vop_fields.bits.vop_rounding_type        = s->no_rounding;
-    pic_param->vop_fields.bits.intra_dc_vlc_thr         = mpeg4_get_intra_dc_vlc_thr(s);
+    pic_param->vop_fields.bits.intra_dc_vlc_thr         = mpeg4_get_intra_dc_vlc_thr(ctx);
     pic_param->vop_fields.bits.top_field_first          = s->top_field_first;
     pic_param->vop_fields.bits.alternate_vertical_scan_flag = s->alternate_scan;
     pic_param->vop_fcode_forward                        = s->f_code;