checkasm: Add tests for h264 idct

The tests are inspired by similar tests for vp9 by
Ronald Bultje.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 232 insertions, 0 deletions

diff --git a/tests/checkasm/h264dsp.c b/tests/checkasm/h264dsp.c
new file mode 100644
index 0000000..082c3d4
--- /dev/null
+++ b/tests/checkasm/h264dsp.c
@@ -0,0 +1,232 @@
+/*
+ * Copyright (c) 2016 Martin Storsjo
+ *
+ * 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 <string.h>
+#include "checkasm.h"
+#include "libavcodec/avcodec.h"
+#include "libavcodec/h264dsp.h"
+#include "libavutil/common.h"
+#include "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
+
+static const uint32_t pixel_mask[3] = { 0xffffffff, 0x01ff01ff, 0x03ff03ff };
+
+#define SIZEOF_PIXEL ((bit_depth + 7) / 8)
+#define SIZEOF_COEF  (2 * ((bit_depth + 7) / 8))
+#define PIXEL_STRIDE 16
+
+#define randomize_buffers()                                                  \
+    do {                                                                     \
+        uint32_t mask = pixel_mask[bit_depth - 8];                           \
+        for (y = 0; y < sz; y++) {                                           \
+            for (x = 0; x < sz * SIZEOF_PIXEL; x += 4) {                     \
+                AV_WN32A(src + y * PIXEL_STRIDE + x, rnd() & mask);          \
+                AV_WN32A(dst + y * PIXEL_STRIDE + x, rnd() & mask);          \
+            }                                                                \
+            for (x = 0; x < sz; x++) {                                       \
+                if (bit_depth == 8) {                                        \
+                    coef[y * sz + x] = src[y * PIXEL_STRIDE + x] -           \
+                                       dst[y * PIXEL_STRIDE + x];            \
+                } else {                                                     \
+                    ((int32_t *)coef)[y * sz + x] =                          \
+                        ((uint16_t *)src)[y * (PIXEL_STRIDE/2) + x] -        \
+                        ((uint16_t *)dst)[y * (PIXEL_STRIDE/2) + x];         \
+                }                                                            \
+            }                                                                \
+        }                                                                    \
+    } while (0)
+
+#define dct4x4_impl(size, dctcoef)                                           \
+static void dct4x4_##size(dctcoef *coef)                                     \
+{                                                                            \
+    int i, y, x;                                                             \
+    dctcoef tmp[16];                                                         \
+    for (i = 0; i < 4; i++) {                                                \
+        const int z0 = coef[i*4 + 0] + coef[i*4 + 3];                        \
+        const int z1 = coef[i*4 + 1] + coef[i*4 + 2];                        \
+        const int z2 = coef[i*4 + 0] - coef[i*4 + 3];                        \
+        const int z3 = coef[i*4 + 1] - coef[i*4 + 2];                        \
+        tmp[i + 4*0] =   z0 +   z1;                                          \
+        tmp[i + 4*1] = 2*z2 +   z3;                                          \
+        tmp[i + 4*2] =   z0 -   z1;                                          \
+        tmp[i + 4*3] =   z2 - 2*z3;                                          \
+    }                                                                        \
+    for (i = 0; i < 4; i++) {                                                \
+        const int z0 = tmp[i*4 + 0] + tmp[i*4 + 3];                          \
+        const int z1 = tmp[i*4 + 1] + tmp[i*4 + 2];                          \
+        const int z2 = tmp[i*4 + 0] - tmp[i*4 + 3];                          \
+        const int z3 = tmp[i*4 + 1] - tmp[i*4 + 2];                          \
+        coef[i*4 + 0] =   z0 +   z1;                                         \
+        coef[i*4 + 1] = 2*z2 +   z3;                                         \
+        coef[i*4 + 2] =   z0 -   z1;                                         \
+        coef[i*4 + 3] =   z2 - 2*z3;                                         \
+    }                                                                        \
+    for (y = 0; y < 4; y++) {                                                \
+        for (x = 0; x < 4; x++) {                                            \
+            static const int scale[] = { 13107 * 10, 8066 * 13, 5243 * 16 }; \
+            const int idx = (y & 1) + (x & 1);                               \
+            coef[y*4 + x] = (coef[y*4 + x] * scale[idx] + (1 << 14)) >> 15;  \
+        }                                                                    \
+    }                                                                        \
+}
+
+#define DCT8_1D(src, srcstride, dst, dststride) do {                         \
+    const int a0 = (src)[srcstride * 0] + (src)[srcstride * 7];              \
+    const int a1 = (src)[srcstride * 0] - (src)[srcstride * 7];              \
+    const int a2 = (src)[srcstride * 1] + (src)[srcstride * 6];              \
+    const int a3 = (src)[srcstride * 1] - (src)[srcstride * 6];              \
+    const int a4 = (src)[srcstride * 2] + (src)[srcstride * 5];              \
+    const int a5 = (src)[srcstride * 2] - (src)[srcstride * 5];              \
+    const int a6 = (src)[srcstride * 3] + (src)[srcstride * 4];              \
+    const int a7 = (src)[srcstride * 3] - (src)[srcstride * 4];              \
+    const int b0 = a0 + a6;                                                  \
+    const int b1 = a2 + a4;                                                  \
+    const int b2 = a0 - a6;                                                  \
+    const int b3 = a2 - a4;                                                  \
+    const int b4 = a3 + a5 + (a1 + (a1 >> 1));                               \
+    const int b5 = a1 - a7 - (a5 + (a5 >> 1));                               \
+    const int b6 = a1 + a7 - (a3 + (a3 >> 1));                               \
+    const int b7 = a3 - a5 + (a7 + (a7 >> 1));                               \
+    (dst)[dststride * 0] =  b0 +  b1;                                        \
+    (dst)[dststride * 1] =  b4 + (b7 >> 2);                                  \
+    (dst)[dststride * 2] =  b2 + (b3 >> 1);                                  \
+    (dst)[dststride * 3] =  b5 + (b6 >> 2);                                  \
+    (dst)[dststride * 4] =  b0  - b1;                                        \
+    (dst)[dststride * 5] =  b6 - (b5 >> 2);                                  \
+    (dst)[dststride * 6] = (b2 >> 1) - b3;                                   \
+    (dst)[dststride * 7] = (b4 >> 2) - b7;                                   \
+} while (0)
+
+#define dct8x8_impl(size, dctcoef)                                           \
+static void dct8x8_##size(dctcoef *coef)                                     \
+{                                                                            \
+    int i, x, y;                                                             \
+    dctcoef tmp[64];                                                         \
+    for (i = 0; i < 8; i++)                                                  \
+        DCT8_1D(coef + i, 8, tmp + i, 8);                                    \
+                                                                             \
+    for (i = 0; i < 8; i++)                                                  \
+        DCT8_1D(tmp + 8*i, 1, coef + i, 8);                                  \
+                                                                             \
+    for (y = 0; y < 8; y++) {                                                \
+        for (x = 0; x < 8; x++) {                                            \
+            static const int scale[] = {                                     \
+                13107 * 20, 11428 * 18, 20972 * 32,                          \
+                12222 * 19, 16777 * 25, 15481 * 24,                          \
+            };                                                               \
+            static const int idxmap[] = {                                    \
+                0, 3, 4, 3,                                                  \
+                3, 1, 5, 1,                                                  \
+                4, 5, 2, 5,                                                  \
+                3, 1, 5, 1,                                                  \
+            };                                                               \
+            const int idx = idxmap[(y & 3) * 4 + (x & 3)];                   \
+            coef[y*8 + x] = ((int64_t)coef[y*8 + x] *                        \
+                             scale[idx] + (1 << 17)) >> 18;                  \
+        }                                                                    \
+    }                                                                        \
+}
+
+dct4x4_impl(16, int16_t)
+dct4x4_impl(32, int32_t)
+
+dct8x8_impl(16, int16_t)
+dct8x8_impl(32, int32_t)
+
+static void dct4x4(int16_t *coef, int bit_depth)
+{
+    if (bit_depth == 8)
+        dct4x4_16(coef);
+    else
+        dct4x4_32((int32_t *) coef);
+}
+
+static void dct8x8(int16_t *coef, int bit_depth)
+{
+    if (bit_depth == 8) {
+        dct8x8_16(coef);
+    } else {
+        dct8x8_32((int32_t *) coef);
+    }
+}
+
+
+static void check_idct(void)
+{
+    LOCAL_ALIGNED_16(uint8_t, src,  [8 * 8 * 2]);
+    LOCAL_ALIGNED_16(uint8_t, dst,  [8 * 8 * 2]);
+    LOCAL_ALIGNED_16(uint8_t, dst0, [8 * 8 * 2]);
+    LOCAL_ALIGNED_16(uint8_t, dst1_base, [8 * 8 * 2 + 32]);
+    LOCAL_ALIGNED_16(int16_t, coef, [8 * 8 * 2]);
+    LOCAL_ALIGNED_16(int16_t, subcoef0, [8 * 8 * 2]);
+    LOCAL_ALIGNED_16(int16_t, subcoef1, [8 * 8 * 2]);
+    H264DSPContext h;
+    int bit_depth, sz, align;
+    int x, y, dc;
+    declare_func_emms(AV_CPU_FLAG_MMX, void, uint8_t *dst, int16_t *block, int stride);
+
+    for (bit_depth = 8; bit_depth <= 10; bit_depth++) {
+        ff_h264dsp_init(&h, bit_depth, 1);
+        for (sz = 4; sz <= 8; sz += 4) {
+            randomize_buffers();
+
+            if (sz == 4)
+                dct4x4(coef, bit_depth);
+            else
+                dct8x8(coef, bit_depth);
+
+            for (dc = 0; dc <= 1; dc++) {
+                void (*idct)(uint8_t *, int16_t *, int) = NULL;
+                switch ((sz << 1) | dc) {
+                case (4 << 1) | 0: idct = h.h264_idct_add; break;
+                case (4 << 1) | 1: idct = h.h264_idct_dc_add; break;
+                case (8 << 1) | 0: idct = h.h264_idct8_add; break;
+                case (8 << 1) | 1: idct = h.h264_idct8_dc_add; break;
+                }
+                if (check_func(idct, "h264_idct%d_add%s_%dbpp", sz, dc ? "_dc" : "", bit_depth)) {
+                    for (align = 0; align < 16; align += sz * SIZEOF_PIXEL) {
+                        uint8_t *dst1 = dst1_base + align;
+                        if (dc) {
+                            memset(subcoef0, 0, sz * sz * SIZEOF_COEF);
+                            memcpy(subcoef0, coef, SIZEOF_COEF);
+                        } else {
+                            memcpy(subcoef0, coef, sz * sz * SIZEOF_COEF);
+                        }
+                        memcpy(dst0, dst, sz * PIXEL_STRIDE);
+                        memcpy(dst1, dst, sz * PIXEL_STRIDE);
+                        memcpy(subcoef1, subcoef0, sz * sz * SIZEOF_COEF);
+                        call_ref(dst0, subcoef0, PIXEL_STRIDE);
+                        call_new(dst1, subcoef1, PIXEL_STRIDE);
+                        if (memcmp(dst0, dst1, sz * PIXEL_STRIDE) ||
+                            memcmp(subcoef0, subcoef1, sz * sz * SIZEOF_COEF))
+                            fail();
+                        bench_new(dst1, subcoef1, sz * SIZEOF_PIXEL);
+                    }
+                }
+            }
+        }
+    }
+    report("idct");
+}
+
+void checkasm_check_h264dsp(void)
+{
+    check_idct();
+}