diff --git a/configure b/configure
index 97f374bc1b..1f5788b855 100755
--- a/configure
+++ b/configure
@@ -2261,6 +2261,7 @@ faandct_deps="faan fdctdsp"
 faanidct_deps="faan idctdsp"
 h264dsp_select="startcode"
 frame_thread_encoder_deps="encoders threads"
+intrax8_select="idctdsp"
 mdct_select="fft"
 me_cmp_select="fdctdsp idctdsp pixblockdsp"
 mpeg_er_select="error_resilience"
diff --git a/libavcodec/intrax8.c b/libavcodec/intrax8.c
index 9141c5bb7a..471009e61a 100644
--- a/libavcodec/intrax8.c
+++ b/libavcodec/intrax8.c
@@ -488,7 +488,7 @@ static void x8_ac_compensation(IntraX8Context *const w, const int direction,
 {
     MpegEncContext *const s = w->s;
     int t;
-#define B(x,y)  s->block[0][w->idct_permutation[(x)+(y)*8]]
+#define B(x,y)  s->block[0][w->idct_permutation[(x) + (y) * 8]]
 #define T(x)  ((x) * dc_level + 0x8000) >> 16;
     switch (direction) {
     case 0:
@@ -739,12 +739,14 @@ static void x8_init_block_index(IntraX8Context *w, AVFrame *frame, int mb_y)
     w->dest[2] += (mb_y & (~1)) * uvlinesize << 2;
 }
 
-av_cold int ff_intrax8_common_init(IntraX8Context *w, MpegEncContext *const s)
+av_cold int ff_intrax8_common_init(IntraX8Context *w, IDCTDSPContext *idsp,
+                                   MpegEncContext *const s)
 {
     int ret = x8_vlc_init();
     if (ret < 0)
         return ret;
 
+    w->idsp = *idsp;
     w->s = s;
 
     //two rows, 2 blocks per cannon mb
diff --git a/libavcodec/intrax8.h b/libavcodec/intrax8.h
index fdbcdec59a..849e04d952 100644
--- a/libavcodec/intrax8.h
+++ b/libavcodec/intrax8.h
@@ -21,6 +21,7 @@
 
 #include "get_bits.h"
 #include "mpegvideo.h"
+#include "idctdsp.h"
 #include "intrax8dsp.h"
 #include "wmv2dsp.h"
 
@@ -40,6 +41,7 @@ typedef struct IntraX8Context {
     //set by the caller codec
     MpegEncContext * s;
     IntraX8DSPContext dsp;
+    IDCTDSPContext idsp;
     int quant;
     int dquant;
     int qsum;
@@ -64,10 +66,12 @@ typedef struct IntraX8Context {
  * Initialize IntraX8 frame decoder.
  * Requires valid MpegEncContext with valid s->mb_width before calling.
  * @param w pointer to IntraX8Context
+ * @param idsp pointer to IDCTDSPContext
  * @param s pointer to MpegEncContext of the parent codec
  * @return 0 on success, a negative AVERROR value on error
  */
-int ff_intrax8_common_init(IntraX8Context *w, MpegEncContext *const s);
+int ff_intrax8_common_init(IntraX8Context *w, IDCTDSPContext *idsp,
+                           MpegEncContext *const s);
 
 /**
  * Destroy IntraX8 frame structure.
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index dae697bd9c..25251c820e 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -387,7 +387,7 @@ av_cold int ff_vc1_decode_init_alloc_tables(VC1Context *v)
                 return AVERROR(ENOMEM);
     }
 
-    ret = ff_intrax8_common_init(&v->x8, s);
+    ret = ff_intrax8_common_init(&v->x8, &s->idsp, s);
     if (ret < 0)
         goto error;
 
diff --git a/libavcodec/wmv2dec.c b/libavcodec/wmv2dec.c
index 934bf153ac..a365838b2f 100644
--- a/libavcodec/wmv2dec.c
+++ b/libavcodec/wmv2dec.c
@@ -466,7 +466,7 @@ static av_cold int wmv2_decode_init(AVCodecContext *avctx)
 
     ff_wmv2_common_init(w);
 
-    return ff_intrax8_common_init(&w->x8, &w->s);
+    return ff_intrax8_common_init(&w->x8, &w->s.idsp, &w->s);
 }
 
 static av_cold int wmv2_decode_end(AVCodecContext *avctx)