checkasm: add synth_filter test

tests/checkasm/Makefile

 # libavcodec tests
 AVCODECOBJS-$(CONFIG_BSWAPDSP) += bswapdsp.o
-AVCODECOBJS-$(CONFIG_DCA_DECODER) += dcadsp.o
+AVCODECOBJS-$(CONFIG_DCA_DECODER) += dcadsp.o synth_filter.o
 AVCODECOBJS-$(CONFIG_H264PRED) += h264pred.o
 AVCODECOBJS-$(CONFIG_H264QPEL) += h264qpel.o
 AVCODECOBJS-$(CONFIG_HEVC_DECODER) += hevc_mc.o

tests/checkasm/checkasm.c

@@ -63,6 +63,7 @@ static const struct {
 #endif
 #if CONFIG_DCA_DECODER
     { "dcadsp", checkasm_check_dcadsp },
+    { "synth_filter", checkasm_check_synth_filter },
 #endif
 #if CONFIG_H264PRED
     { "h264pred", checkasm_check_h264pred },

tests/checkasm/checkasm.h

@@ -35,6 +35,7 @@ void checkasm_check_dcadsp(void);
 void checkasm_check_h264pred(void);
 void checkasm_check_h264qpel(void);
 void checkasm_check_hevc_mc(void);
+void checkasm_check_synth_filter(void);
 void checkasm_check_v210enc(void);
 
 void *checkasm_check_func(void *func, const char *name, ...) av_printf_format(2, 3);

tests/checkasm/synth_filter.c

+/*
+ * Copyright (c) 2015 Janne Grunau
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Libav; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <math.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libavutil/internal.h"
+#include "libavutil/intfloat.h"
+#include "libavcodec/dcadata.h"
+#include "libavcodec/synth_filter.h"
+
+#include "checkasm.h"
+
+#define BUF_SIZE 32
+
+#define randomize_input()                                       \
+    do {                                                        \
+        int i;                                                  \
+        for (i = 0; i < BUF_SIZE; i++) {                        \
+            float f = (float)rnd() / (UINT_MAX >> 5) - 16.0f;   \
+            in[i] = f;                                          \
+        }                                                       \
+    } while (0)
+
+void checkasm_check_synth_filter(void)
+{
+    FFTContext imdct;
+    SynthFilterContext synth;
+
+    ff_mdct_init(&imdct, 6, 1, 1.0);
+    ff_synth_filter_init(&synth);
+
+    if (check_func(synth.synth_filter_float, "synth_filter_float")) {
+        LOCAL_ALIGNED(32, float,   out0,   [BUF_SIZE]);
+        LOCAL_ALIGNED(32, float,   out1,   [BUF_SIZE]);
+        LOCAL_ALIGNED(32, float,   out_b,  [BUF_SIZE]);
+        LOCAL_ALIGNED(32, float,   in,     [BUF_SIZE]);
+        LOCAL_ALIGNED(32, float,   buf2_0, [BUF_SIZE]);
+        LOCAL_ALIGNED(32, float,   buf2_1, [BUF_SIZE]);
+        LOCAL_ALIGNED(32, float,   buf2_b, [BUF_SIZE]);
+        LOCAL_ALIGNED(32, float,   buf0,   [512]);
+        LOCAL_ALIGNED(32, float,   buf1,   [512]);
+        LOCAL_ALIGNED(32, float,   buf_b,  [512]);
+        float scale = 1.0f;
+        int i, offset0 = 0, offset1 = 0, offset_b = 0;
+
+        declare_func(void, FFTContext *, float *, int *, float[32], const float[512],
+                     float[32], float[32], float);
+
+        memset(buf2_0, 0, sizeof(*buf2_0) * BUF_SIZE);
+        memset(buf2_1, 0, sizeof(*buf2_1) * BUF_SIZE);
+        memset(buf2_b, 0, sizeof(*buf2_b) * BUF_SIZE);
+        memset(buf0, 0, sizeof(*buf2_0) * 512);
+        memset(buf1, 0, sizeof(*buf2_1) * 512);
+        memset(buf_b, 0, sizeof(*buf2_b) * 512);
+
+        /* more than 1 synth_buf_offset wrap-around */
+        for (i = 0; i < 20; i++) {
+            int j;
+            const float * window = (i & 1) ? ff_dca_fir_32bands_perfect : ff_dca_fir_32bands_nonperfect;
+
+            memset(out0, 0, sizeof(*out0) * BUF_SIZE);
+            memset(out1, 0, sizeof(*out1) * BUF_SIZE);
+            memset(out_b, 0, sizeof(*out_b) * BUF_SIZE);
+
+            randomize_input();
+
+            call_ref(&imdct, buf0, &offset0, buf2_0, window,
+                     out0, in, scale);
+            call_new(&imdct, buf1, &offset1, buf2_1, window,
+                     out1, in, scale);
+
+            if (offset0 != offset1) {
+                fail();
+                fprintf(stderr, "offsets do not match: %d, %d", offset0, offset1);
+                break;
+            }
+
+            for (j = 0; j < BUF_SIZE; j++) {
+                if (!float_near_abs_eps_ulp(out0[j],   out1[j],   7.0e-7, 16) ||
+                    !float_near_abs_eps_ulp(buf2_0[j], buf2_1[j], 7.0e-7, 16)) {
+                    union av_intfloat32 o0, o1, b0, b1;
+
+                    fail();
+                    o0.f = out0[j];   o1.f = out1[j];
+                    b0.f = buf2_0[j], b1.f = buf2_1[j];
+                    fprintf(stderr, "out:  %11g (0x%08x); %11g (0x%08x); abs diff %11g\n",
+                            o0.f, o0.i, o1.f, o1.i, fabsf(o0.f - o1.f));
+                    fprintf(stderr, "buf2: %11g (0x%08x); %11g (0x%08x); abs diff %11g\n",
+                            b0.f, b0.i, b1.f, b1.i, fabsf(b0.f - b1.f));
+                    break;
+                }
+            }
+
+            bench_new(&imdct, buf_b, &offset_b, buf2_b, window,
+                      out_b, in, scale);
+        }
+    }
+    ff_mdct_end(&imdct);
+
+    report("synth_filter");
+}