mpegaudio: clean up compute_antialias() definition

This merges the float and fixed-point versions of the compute_antialias
function, fixes invalid array indexing, and eliminates a dead copy of
csa_table.

Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/mpegaudiodec_float.c

@@ -22,45 +22,6 @@
 #define CONFIG_FLOAT 1
 #include "mpegaudiodec.c"
 
-static void compute_antialias_float(MPADecodeContext *s,
-                              GranuleDef *g)
-{
-    float *ptr;
-    int n, i;
-
-    /* we antialias only "long" bands */
-    if (g->block_type == 2) {
-        if (!g->switch_point)
-            return;
-        /* XXX: check this for 8000Hz case */
-        n = 1;
-    } else {
-        n = SBLIMIT - 1;
-    }
-
-    ptr = g->sb_hybrid + 18;
-    for(i = n;i > 0;i--) {
-        float tmp0, tmp1;
-        float *csa = &csa_table_float[0][0];
-#define FLOAT_AA(j)\
-        tmp0= ptr[-1-j];\
-        tmp1= ptr[   j];\
-        ptr[-1-j] = tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j];\
-        ptr[   j] = tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j];
-
-        FLOAT_AA(0)
-        FLOAT_AA(1)
-        FLOAT_AA(2)
-        FLOAT_AA(3)
-        FLOAT_AA(4)
-        FLOAT_AA(5)
-        FLOAT_AA(6)
-        FLOAT_AA(7)
-
-        ptr += 18;
-    }
-}
-
 #if CONFIG_MP1FLOAT_DECODER
 AVCodec ff_mp1float_decoder =
 {