checkasm: add test for fdct

Reviewed-by: Martin Storsjö <martin@martin.st>
Reviewed-by: Rémi Denis-Courmont <remi@remlab.net>

tests/checkasm/Makefile

@@ -4,6 +4,7 @@ AVCODECOBJS-$(CONFIG_AC3DSP)            += ac3dsp.o
 AVCODECOBJS-$(CONFIG_AUDIODSP)          += audiodsp.o
 AVCODECOBJS-$(CONFIG_BLOCKDSP)          += blockdsp.o
 AVCODECOBJS-$(CONFIG_BSWAPDSP)          += bswapdsp.o
+AVCODECOBJS-$(CONFIG_FDCTDSP)           += fdctdsp.o
 AVCODECOBJS-$(CONFIG_FMTCONVERT)        += fmtconvert.o
 AVCODECOBJS-$(CONFIG_G722DSP)           += g722dsp.o
 AVCODECOBJS-$(CONFIG_H264CHROMA)        += h264chroma.o

tests/checkasm/checkasm.c

@@ -106,6 +106,9 @@ static const struct {
     #if CONFIG_EXR_DECODER
         { "exrdsp", checkasm_check_exrdsp },
     #endif
+    #if CONFIG_FDCTDSP
+        { "fdctdsp", checkasm_check_fdctdsp },
+    #endif
     #if CONFIG_FLAC_DECODER
         { "flacdsp", checkasm_check_flacdsp },
     #endif

tests/checkasm/checkasm.h

@@ -85,6 +85,7 @@ void checkasm_check_blockdsp(void);
 void checkasm_check_bswapdsp(void);
 void checkasm_check_colorspace(void);
 void checkasm_check_exrdsp(void);
+void checkasm_check_fdctdsp(void);
 void checkasm_check_fixed_dsp(void);
 void checkasm_check_flacdsp(void);
 void checkasm_check_float_dsp(void);

tests/checkasm/fdctdsp.c

@@ -0,0 +1,71 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <string.h>
+
+#include "checkasm.h"
+
+#include "libavcodec/avcodec.h"
+#include "libavcodec/fdctdsp.h"
+
+#include "libavutil/common.h"
+#include "libavutil/internal.h"
+#include "libavutil/mem_internal.h"
+
+static int int16_cmp_off_by_n(const int16_t *ref, const int16_t *test, size_t n, int accuracy)
+{
+    for (size_t i = 0; i < n; i++) {
+        if (abs(ref[i] - test[i]) > accuracy)
+            return 1;
+    }
+    return 0;
+}
+
+static void check_fdct(void)
+{
+    LOCAL_ALIGNED_16(int16_t, block0, [64]);
+    LOCAL_ALIGNED_16(int16_t, block1, [64]);
+
+    AVCodecContext avctx = {
+        .bits_per_raw_sample = 8,
+        .dct_algo = FF_DCT_AUTO,
+    };
+    FDCTDSPContext h;
+
+    ff_fdctdsp_init(&h, &avctx);
+
+    if (check_func(h.fdct, "fdct")) {
+        declare_func(void, int16_t *);
+        for (int i = 0; i < 64; i++) {
+            uint8_t r = rnd();
+            block0[i] = r;
+            block1[i] = r;
+        }
+        call_ref(block0);
+        call_new(block1);
+        if (int16_cmp_off_by_n(block0, block1, 64, 2))
+            fail();
+        bench_new(block1);
+    }
+}
+
+void checkasm_check_fdctdsp(void)
+{
+    check_fdct();
+    report("fdctdsp");
+}

tests/fate/checkasm.mak

@@ -8,6 +8,7 @@ FATE_CHECKASM = fate-checkasm-aacencdsp                                 \
                 fate-checkasm-blockdsp                                  \
                 fate-checkasm-bswapdsp                                  \
                 fate-checkasm-exrdsp                                    \
+                fate-checkasm-fdctdsp                                   \
                 fate-checkasm-fixed_dsp                                 \
                 fate-checkasm-flacdsp                                   \
                 fate-checkasm-float_dsp                                 \