Replace av_unused attributes by block structures

This is more portable and avoids warnings with compilers that do not
properly support av_unused.

libavcodec/faandct.c

@@ -68,7 +68,6 @@ static av_always_inline void row_fdct(FLOAT temp[64], int16_t *data)
     FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
     FLOAT tmp10, tmp11, tmp12, tmp13;
     FLOAT z2, z4, z11, z13;
-    FLOAT av_unused z5;
     int i;
 
     for (i=0; i<8*8; i+=8) {
@@ -99,9 +98,12 @@ static av_always_inline void row_fdct(FLOAT temp[64], int16_t *data)
         tmp6 += tmp7;
 
 #if 0
-        z5= (tmp4 - tmp6) * A5;
-        z2= tmp4*A2 + z5;
-        z4= tmp6*A4 + z5;
+        {
+            FLOAT z5;
+            z5 = (tmp4 - tmp6) * A5;
+            z2 =  tmp4         * A2 + z5;
+            z4 =  tmp6         * A4 + z5;
+        }
 #else
         z2= tmp4*(A2+A5) - tmp6*A5;
         z4= tmp6*(A4-A5) + tmp4*A5;
@@ -123,7 +125,6 @@ void ff_faandct(int16_t *data)
     FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
     FLOAT tmp10, tmp11, tmp12, tmp13;
     FLOAT z2, z4, z11, z13;
-    FLOAT av_unused z5;
     FLOAT temp[64];
     int i;
 
@@ -159,9 +160,12 @@ void ff_faandct(int16_t *data)
         tmp6 += tmp7;
 
 #if 0
-        z5= (tmp4 - tmp6) * A5;
-        z2= tmp4*A2 + z5;
-        z4= tmp6*A4 + z5;
+        {
+            FLOAT z5;
+            z5 = (tmp4 - tmp6) * A5;
+            z2 =  tmp4         * A2 + z5;
+            z4 =  tmp6         * A4 + z5;
+        }
 #else
         z2= tmp4*(A2+A5) - tmp6*A5;
         z4= tmp6*(A4-A5) + tmp4*A5;

libavcodec/faanidct.c

@@ -49,7 +49,6 @@ B7*B0/8, B7*B1/8, B7*B2/8, B7*B3/8, B7*B4/8, B7*B5/8, B7*B6/8, B7*B7/8,
 
 static inline void p8idct(int16_t data[64], FLOAT temp[64], uint8_t *dest, int stride, int x, int y, int type){
     int i;
-    FLOAT av_unused tmp0;
     FLOAT s04, d04, s17, d17, s26, d26, s53, d53;
     FLOAT os07, os16, os25, os34;
     FLOAT od07, od16, od25, od34;
@@ -64,9 +63,12 @@ static inline void p8idct(int16_t data[64], FLOAT temp[64], uint8_t *dest, int s
         od25= (s17 - s53)*(2*A4);
 
 #if 0 //these 2 are equivalent
-        tmp0= (d17 + d53)*(2*A2);
-        od34=  d17*( 2*B6) - tmp0;
-        od16=  d53*(-2*B2) + tmp0;
+        {
+            FLOAT tmp0;
+            tmp0 = (d17 + d53) *  (2 * A2);
+            od34 =  d17        *  (2 * B6) - tmp0;
+            od16 =  d53        * (-2 * B2) + tmp0;
+        }
 #else
         od34=  d17*(2*(B6-A2)) - d53*(2*A2);
         od16=  d53*(2*(A2-B2)) + d17*(2*A2);

libavcodec/h264_loopfilter.c

@@ -704,7 +704,6 @@ void ff_h264_filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint
     const int mb_type = h->cur_pic.mb_type[mb_xy];
     const int mvy_limit = IS_INTERLACED(mb_type) ? 2 : 4;
     int first_vertical_edge_done = 0;
-    av_unused int dir;
     int chroma = !(CONFIG_GRAY && (h->flags&CODEC_FLAG_GRAY));
     int qp_bd_offset = 6 * (h->sps.bit_depth_luma - 8);
     int a = 52 + h->slice_alpha_c0_offset - qp_bd_offset;
@@ -815,8 +814,14 @@ void ff_h264_filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint
     }
 
 #if CONFIG_SMALL
-    for( dir = 0; dir < 2; dir++ )
-        filter_mb_dir(h, mb_x, mb_y, img_y, img_cb, img_cr, linesize, uvlinesize, mb_xy, mb_type, mvy_limit, dir ? 0 : first_vertical_edge_done, a, b, chroma, dir);
+    {
+        int dir;
+        for (dir = 0; dir < 2; dir++)
+            filter_mb_dir(h, mb_x, mb_y, img_y, img_cb, img_cr, linesize,
+                          uvlinesize, mb_xy, mb_type, mvy_limit,
+                          dir ? 0 : first_vertical_edge_done, a, b,
+                          chroma, dir);
+    }
 #else
     filter_mb_dir(h, mb_x, mb_y, img_y, img_cb, img_cr, linesize, uvlinesize, mb_xy, mb_type, mvy_limit, first_vertical_edge_done, a, b, chroma, 0);
     filter_mb_dir(h, mb_x, mb_y, img_y, img_cb, img_cr, linesize, uvlinesize, mb_xy, mb_type, mvy_limit, 0,                        a, b, chroma, 1);

libavcodec/rangecoder.h

@@ -115,7 +115,6 @@ static inline void refill(RangeCoder *c)
 static inline int get_rac(RangeCoder *c, uint8_t *const state)
 {
     int range1 = (c->range * (*state)) >> 8;
-    int av_unused one_mask;
 
     c->range -= range1;
 #if 1
@@ -131,13 +130,14 @@ static inline int get_rac(RangeCoder *c, uint8_t *const state)
         return 1;
     }
 #else
-    one_mask = (c->range - c->low - 1) >> 31;
+    {
+        int one_mask one_mask = (c->range - c->low - 1) >> 31;
 
-    c->low   -= c->range & one_mask;
-    c->range += (range1 - c->range) & one_mask;
-
-    *state = c->zero_state[(*state) + (256 & one_mask)];
+        c->low   -=           c->range  & one_mask;
+        c->range += (range1 - c->range) & one_mask;
 
+        *state = c->zero_state[(*state) + (256 & one_mask)];
+    }
     refill(c);
 
     return one_mask & 1;