[FFmpeg-devel] [PATCH 1/3] checkasm/hevc_deblock: add luma and chroma full

* [FFmpeg-devel] [PATCH 1/3] checkasm/hevc_deblock: add luma and chroma full
@ 2024-02-21 11:10 J. Dekker
  2024-02-21 11:10 ` [FFmpeg-devel] [PATCH 2/3] avcodec/x86: disable hevc 12b luma deblock J. Dekker
  2024-02-21 11:10 ` [FFmpeg-devel] [PATCH 3/3] avcodec/aarch64: add hevc deblock NEON J. Dekker
  0 siblings, 2 replies; 10+ messages in thread
From: J. Dekker @ 2024-02-21 11:10 UTC (permalink / raw)
  To: ffmpeg-devel

Signed-off-by: J. Dekker <jdek@itanimul.li>
---
 tests/checkasm/hevc_deblock.c | 246 +++++++++++++++++++++++++++++-----
 1 file changed, 215 insertions(+), 31 deletions(-)

diff --git a/tests/checkasm/hevc_deblock.c b/tests/checkasm/hevc_deblock.c
index 66fc8d5646..91e57f5cf5 100644
--- a/tests/checkasm/hevc_deblock.c
+++ b/tests/checkasm/hevc_deblock.c
@@ -19,9 +19,9 @@
 #include <string.h>
 
 #include "libavutil/intreadwrite.h"
+#include "libavutil/macros.h"
 #include "libavutil/mem_internal.h"
 
-#include "libavcodec/avcodec.h"
 #include "libavcodec/hevcdsp.h"
 
 #include "checkasm.h"
@@ -29,10 +29,11 @@
 static const uint32_t pixel_mask[3] = { 0xffffffff, 0x03ff03ff, 0x0fff0fff };
 
 #define SIZEOF_PIXEL ((bit_depth + 7) / 8)
-#define BUF_STRIDE (8 * 2)
-#define BUF_LINES (8)
-#define BUF_OFFSET (BUF_STRIDE * BUF_LINES)
-#define BUF_SIZE (BUF_STRIDE * BUF_LINES + BUF_OFFSET * 2)
+#define BUF_STRIDE (16 * 2)
+#define BUF_LINES (16)
+// large buffer sizes based on high bit depth
+#define BUF_OFFSET (2 * BUF_STRIDE * BUF_LINES)
+#define BUF_SIZE (2 * BUF_STRIDE * BUF_LINES + BUF_OFFSET * 2)
 
 #define randomize_buffers(buf0, buf1, size)                 \
     do {                                                    \
@@ -45,57 +46,240 @@ static const uint32_t pixel_mask[3] = { 0xffffffff, 0x03ff03ff, 0x0fff0fff };
         }                                                   \
     } while (0)
 
-static void check_deblock_chroma(HEVCDSPContext *h, int bit_depth)
+static void check_deblock_chroma(HEVCDSPContext *h, int bit_depth, int c)
 {
-    int32_t tc[2] = { 0, 0 };
+    // see tctable[] in hevc_filter.c, we check full range
+    int32_t tc[2] = { rnd() % 25, rnd() % 25 };
     // no_p, no_q can only be { 0,0 } for the simpler assembly (non *_c
     // variant) functions, see deblocking_filter_CTB() in hevc_filter.c
-    uint8_t no_p[2] = { 0, 0 };
-    uint8_t no_q[2] = { 0, 0 };
+    uint8_t no_p[2] = { rnd() & c, rnd() & c };
+    uint8_t no_q[2] = { rnd() & c, rnd() & c };
     LOCAL_ALIGNED_32(uint8_t, buf0, [BUF_SIZE]);
     LOCAL_ALIGNED_32(uint8_t, buf1, [BUF_SIZE]);
 
     declare_func(void, uint8_t *pix, ptrdiff_t stride, int32_t *tc, uint8_t *no_p, uint8_t *no_q);
 
-    if (check_func(h->hevc_h_loop_filter_chroma, "hevc_h_loop_filter_chroma%d", bit_depth)) {
-        for (int i = 0; i < 4; i++) {
-            randomize_buffers(buf0, buf1, BUF_SIZE);
-            // see betatable[] in hevc_filter.c
-            tc[0] = (rnd() & 63) + (rnd() & 1);
-            tc[1] = (rnd() & 63) + (rnd() & 1);
+    if (check_func(c ? h->hevc_h_loop_filter_chroma_c : h->hevc_h_loop_filter_chroma,
+                         "hevc_h_loop_filter_chroma%d%s", bit_depth, c ? "_full" : ""))
+    {
+        randomize_buffers(buf0, buf1, BUF_SIZE);
 
-            call_ref(buf0 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
-            call_new(buf1 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
+        call_ref(buf0 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
+        call_new(buf1 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
+        if (memcmp(buf0, buf1, BUF_SIZE))
+            fail();
+        bench_new(buf1 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
+    }
+
+    if (check_func(c ? h->hevc_v_loop_filter_chroma_c : h->hevc_v_loop_filter_chroma,
+                         "hevc_v_loop_filter_chroma%d%s", bit_depth, c ? "_full" : ""))
+    {
+        randomize_buffers(buf0, buf1, BUF_SIZE);
+
+        call_ref(buf0 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
+        call_new(buf1 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
+        if (memcmp(buf0, buf1, BUF_SIZE))
+            fail();
+        bench_new(buf1 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
+    }
+}
+
+#define P3 buf[-4 * xstride]
+#define P2 buf[-3 * xstride]
+#define P1 buf[-2 * xstride]
+#define P0 buf[-1 * xstride]
+#define Q0 buf[0 * xstride]
+#define Q1 buf[1 * xstride]
+#define Q2 buf[2 * xstride]
+#define Q3 buf[3 * xstride]
+
+#define TC25(x) ((tc[x] * 5 + 1) >> 1)
+#define MASK(x) (uint16_t)(x & ((1 << (bit_depth)) - 1))
+#define GET(x) ((SIZEOF_PIXEL == 1) ? *(uint8_t*)(&x) : *(uint16_t*)(&x))
+#define SET(x, y) do { \
+    uint16_t z = MASK(y); \
+    if (SIZEOF_PIXEL == 1) \
+        *(uint8_t*)(&x) = z; \
+    else \
+        *(uint16_t*)(&x) = z; \
+} while (0)
+#define RANDCLIP(x, diff) av_clip(GET(x) - (diff), 0, \
+    (1 << (bit_depth)) - 1) + rnd() % FFMAX(2 * (diff), 1)
+
+// NOTE: this function doesn't work 'correctly' in that it won't always choose
+// strong/strong or weak/weak, in most cases it tends to but will sometimes mix
+// weak/strong or even skip sometimes. This is more useful to test correctness
+// for these functions, though it does make benching them difficult. The easiest
+// way to bench these functions is to check an overall decode since there are too
+// many paths and ways to trigger the deblock: we would have to bench all
+// permutations of weak/strong/skip/nd_q/nd_p/no_q/no_p and it quickly becomes
+// too much.
+static void randomize_luma_buffers(int type, int *beta, int32_t tc[2],
+   uint8_t *buf, ptrdiff_t xstride, ptrdiff_t ystride, int bit_depth)
+{
+    int i, j, b3, tc25, tc25diff, b3diff;
+    // both tc & beta are unscaled inputs
+    // minimum useful value is 1, full range 0-24
+    tc[0] = (rnd() % 25) + 1;
+    tc[1] = (rnd() % 25) + 1;
+    // minimum useful value for 8bit is 8
+    *beta = (rnd() % 57) + 8;
+
+    switch (type) {
+    case 0: // strong
+        for (j = 0; j < 2; j++) {
+            tc25 = TC25(j) << (bit_depth - 8);
+            tc25diff = FFMAX(tc25 - 1, 0);
+            // 4 lines per tc
+            for (i = 0; i < 4; i++) {
+                b3 = (*beta << (bit_depth - 8)) >> 3;
+
+                SET(P0, rnd() % (1 << bit_depth));
+                SET(Q0, RANDCLIP(P0, tc25diff));
+
+                // p3 - p0 up to beta3 budget
+                b3diff = rnd() % b3;
+                SET(P3, RANDCLIP(P0, b3diff));
+                // q3 - q0, reduced budget
+                b3diff = rnd() % FFMAX(b3 - b3diff, 1);
+                SET(Q3, RANDCLIP(Q0, b3diff));
+
+                // same concept, budget across 4 pixels
+                b3 -= b3diff = rnd() % FFMAX(b3, 1);
+                SET(P2, RANDCLIP(P0, b3diff));
+                b3 -= b3diff = rnd() % FFMAX(b3, 1);
+                SET(Q2, RANDCLIP(Q0, b3diff));
+
+                // extra reduced budget for weighted pixels
+                b3 -= b3diff = rnd() % FFMAX(b3 - (1 << (bit_depth - 8)), 1);
+                SET(P1, RANDCLIP(P0, b3diff));
+                b3 -= b3diff = rnd() % FFMAX(b3 - (1 << (bit_depth - 8)), 1);
+                SET(Q1, RANDCLIP(Q0, b3diff));
+
+                buf += ystride;
+            }
+        }
+        break;
+    case 1: // weak
+        for (j = 0; j < 2; j++) {
+            tc25 = TC25(j) << (bit_depth - 8);
+            tc25diff = FFMAX(tc25 - 1, 0);
+            // 4 lines per tc
+            for (i = 0; i < 4; i++) {
+                // Weak filtering is signficantly simpler to activate as
+                // we only need to satisfy d0 + d3 < beta, which
+                // can be simplified to d0 + d0 < beta. Using the above
+                // derivations but substiuting b3 for b1 and ensuring
+                // that P0/Q0 are at least 1/2 tc25diff apart (tending
+                // towards 1/2 range).
+                b3 = (*beta << (bit_depth - 8)) >> 1;
+
+                SET(P0, rnd() % (1 << bit_depth));
+                SET(Q0, RANDCLIP(P0, tc25diff >> 1) +
+                    (tc25diff >> 1) * (P0 < (1 << (bit_depth - 1))) ? 1 : -1);
+
+                // p3 - p0 up to beta3 budget
+                b3diff = rnd() % b3;
+                SET(P3, RANDCLIP(P0, b3diff));
+                // q3 - q0, reduced budget
+                b3diff = rnd() % FFMAX(b3 - b3diff, 1);
+                SET(Q3, RANDCLIP(Q0, b3diff));
+
+                // same concept, budget across 4 pixels
+                b3 -= b3diff = rnd() % FFMAX(b3, 1);
+                SET(P2, RANDCLIP(P0, b3diff));
+                b3 -= b3diff = rnd() % FFMAX(b3, 1);
+                SET(Q2, RANDCLIP(Q0, b3diff));
+
+                // extra reduced budget for weighted pixels
+                b3 -= b3diff = rnd() % FFMAX(b3 - (1 << (bit_depth - 8)), 1);
+                SET(P1, RANDCLIP(P0, b3diff));
+                b3 -= b3diff = rnd() % FFMAX(b3 - (1 << (bit_depth - 8)), 1);
+                SET(Q1, RANDCLIP(Q0, b3diff));
+
+                buf += ystride;
+            }
+        }
+        break;
+    case 2: // none
+        *beta = 0; // ensure skip
+        for (i = 0; i < 8; i++) {
+            // we can just fill with completely random data, nothing should be touched.
+            SET(P3, rnd()); SET(P2, rnd()); SET(P1, rnd()); SET(P0, rnd());
+            SET(Q0, rnd()); SET(Q1, rnd()); SET(Q2, rnd()); SET(Q3, rnd());
+            buf += ystride;
+        }
+        break;
+    }
+}
+
+static void check_deblock_luma(HEVCDSPContext *h, int bit_depth, int c)
+{
+    const char *type;
+    const char *types[3] = { "strong", "weak", "skip" };
+    int beta;
+    int32_t tc[2] = {0};
+    uint8_t no_p[2] = { rnd() & c, rnd() & c };
+    uint8_t no_q[2] = { rnd() & c, rnd() & c };
+    LOCAL_ALIGNED_32(uint8_t, buf0, [BUF_SIZE]);
+    LOCAL_ALIGNED_32(uint8_t, buf1, [BUF_SIZE]);
+    uint8_t *ptr0 = buf0 + BUF_OFFSET,
+            *ptr1 = buf1 + BUF_OFFSET;
+
+    declare_func(void, uint8_t *pix, ptrdiff_t stride, int beta, int32_t *tc, uint8_t *no_p, uint8_t *no_q);
+
+    for (int j = 0; j < 3; j++) {
+        type = types[j];
+        if (check_func(c ? h->hevc_h_loop_filter_luma_c : h->hevc_h_loop_filter_luma,
+                             "hevc_h_loop_filter_luma%d_%s%s", bit_depth, type, c ? "_full" : ""))
+        {
+            randomize_luma_buffers(j, &beta, tc, buf0 + BUF_OFFSET, 16 * SIZEOF_PIXEL, SIZEOF_PIXEL, bit_depth);
+            memcpy(buf1, buf0, BUF_SIZE);
+
+            call_ref(ptr0, 16 * SIZEOF_PIXEL, beta, tc, no_p, no_q);
+            call_new(ptr1, 16 * SIZEOF_PIXEL, beta, tc, no_p, no_q);
             if (memcmp(buf0, buf1, BUF_SIZE))
                 fail();
+            bench_new(ptr1, 16 * SIZEOF_PIXEL, beta, tc, no_p, no_q);
         }
-        bench_new(buf1 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
-    }
 
-    if (check_func(h->hevc_v_loop_filter_chroma, "hevc_v_loop_filter_chroma%d", bit_depth)) {
-        for (int i = 0; i < 4; i++) {
-            randomize_buffers(buf0, buf1, BUF_SIZE);
-            // see betatable[] in hevc_filter.c
-            tc[0] = (rnd() & 63) + (rnd() & 1);
-            tc[1] = (rnd() & 63) + (rnd() & 1);
+        if (check_func(c ? h->hevc_v_loop_filter_luma_c : h->hevc_v_loop_filter_luma,
+                             "hevc_v_loop_filter_luma%d_%s%s", bit_depth, type, c ? "_full" : ""))
+        {
+            randomize_luma_buffers(j, &beta, tc, buf0 + BUF_OFFSET, SIZEOF_PIXEL, 16 * SIZEOF_PIXEL, bit_depth);
+            memcpy(buf1, buf0, BUF_SIZE);
 
-            call_ref(buf0 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
-            call_new(buf1 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
+            call_ref(ptr0, 16 * SIZEOF_PIXEL, beta, tc, no_p, no_q);
+            call_new(ptr1, 16 * SIZEOF_PIXEL, beta, tc, no_p, no_q);
             if (memcmp(buf0, buf1, BUF_SIZE))
                 fail();
+            bench_new(ptr1, 16 * SIZEOF_PIXEL, beta, tc, no_p, no_q);
         }
-        bench_new(buf1 + BUF_OFFSET, BUF_STRIDE, tc, no_p, no_q);
     }
 }
 
 void checkasm_check_hevc_deblock(void)
 {
+    HEVCDSPContext h;
     int bit_depth;
-
     for (bit_depth = 8; bit_depth <= 12; bit_depth += 2) {
-        HEVCDSPContext h;
         ff_hevc_dsp_init(&h, bit_depth);
-        check_deblock_chroma(&h, bit_depth);
+        check_deblock_chroma(&h, bit_depth, 0);
     }
     report("chroma");
+    for (bit_depth = 8; bit_depth <= 12; bit_depth += 2) {
+        ff_hevc_dsp_init(&h, bit_depth);
+        check_deblock_chroma(&h, bit_depth, 1);
+    }
+    report("chroma_full");
+    for (bit_depth = 8; bit_depth <= 12; bit_depth += 2) {
+        ff_hevc_dsp_init(&h, bit_depth);
+        check_deblock_luma(&h, bit_depth, 0);
+    }
+    report("luma");
+    for (bit_depth = 8; bit_depth <= 12; bit_depth += 2) {
+        ff_hevc_dsp_init(&h, bit_depth);
+        check_deblock_luma(&h, bit_depth, 1);
+    }
+    report("luma_full");
 }
-- 
2.43.2

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