cavsdsp: set idct permutation independently of dsputil

CAVS uses its own idct so using dsputil to set the permutation
is fragile.
Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/cavsdec.c

@@ -915,9 +915,10 @@ static int decode_pic(AVSContext *h) {
     enum cavs_mb mb_type;
 
     if (!s->context_initialized) {
-        s->avctx->idct_algo = FF_IDCT_CAVS;
         if (ff_MPV_common_init(s) < 0)
             return -1;
+        ff_init_scantable_permutation(s->dsp.idct_permutation,
+                                      h->cdsp.idct_perm);
         ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct);
     }
     skip_bits(&s->gb,16);//bbv_dwlay

libavcodec/cavsdsp.c

@@ -544,6 +544,7 @@ av_cold void ff_cavsdsp_init(CAVSDSPContext* c, AVCodecContext *avctx) {
     c->cavs_filter_cv = cavs_filter_cv_c;
     c->cavs_filter_ch = cavs_filter_ch_c;
     c->cavs_idct8_add = cavs_idct8_add_c;
+    c->idct_perm = FF_NO_IDCT_PERM;
 
     if (HAVE_MMX) ff_cavsdsp_init_mmx(c, avctx);
 }

libavcodec/cavsdsp.h

@@ -33,6 +33,7 @@ typedef struct CAVSDSPContext {
     void (*cavs_filter_cv)(uint8_t *pix, int stride, int alpha, int beta, int tc, int bs1, int bs2);
     void (*cavs_filter_ch)(uint8_t *pix, int stride, int alpha, int beta, int tc, int bs1, int bs2);
     void (*cavs_idct8_add)(uint8_t *dst, DCTELEM *block, int stride);
+    int idct_perm;
 } CAVSDSPContext;
 
 void ff_cavsdsp_init(CAVSDSPContext* c, AVCodecContext *avctx);

libavcodec/x86/cavsdsp.c

@@ -461,6 +461,7 @@ static void ff_cavsdsp_init_mmx2(CAVSDSPContext* c, AVCodecContext *avctx) {
     dspfunc(avg_cavs_qpel, 1, 8);
 #undef dspfunc
     c->cavs_idct8_add = cavs_idct8_add_mmx;
+    c->idct_perm = FF_TRANSPOSE_IDCT_PERM;
 }
 
 static void ff_cavsdsp_init_3dnow(CAVSDSPContext* c, AVCodecContext *avctx) {
@@ -477,6 +478,7 @@ static void ff_cavsdsp_init_3dnow(CAVSDSPContext* c, AVCodecContext *avctx) {
     dspfunc(avg_cavs_qpel, 1, 8);
 #undef dspfunc
     c->cavs_idct8_add = cavs_idct8_add_mmx;
+    c->idct_perm = FF_TRANSPOSE_IDCT_PERM;
 }
 
 #endif /* HAVE_INLINE_ASM */

libavcodec/x86/dsputil_mmx.c

@@ -3021,8 +3021,6 @@ void ff_dsputil_init_mmx(DSPContext *c, AVCodecContext *avctx)
                 c->idct_add              = ff_simple_idct_add_mmx;
                 c->idct                  = ff_simple_idct_mmx;
                 c->idct_permutation_type = FF_SIMPLE_IDCT_PERM;
-            } else if (idct_algo == FF_IDCT_CAVS) {
-                    c->idct_permutation_type = FF_TRANSPOSE_IDCT_PERM;
             } else if (idct_algo == FF_IDCT_XVIDMMX) {
                 if (mm_flags & AV_CPU_FLAG_SSE2) {
                     c->idct_put              = ff_idct_xvid_sse2_put;