From ae050f664a1f197bba2306271c7f5f8c2c2304f9 Mon Sep 17 00:00:00 2001
From: Hunter Kvalevog <hunter@kvog.sh>
Date: Wed, 25 Feb 2026 22:10:57 -0600
Subject: yuvbench

---
 yuvbench/yuvbench.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 126 insertions(+), 7 deletions(-)

(limited to 'yuvbench/yuvbench.c')

diff --git a/yuvbench/yuvbench.c b/yuvbench/yuvbench.c
index 8b0d0d5..1d34f0b 100644
--- a/yuvbench/yuvbench.c
+++ b/yuvbench/yuvbench.c
@@ -1,5 +1,99 @@
 #include "yuvbench.h"
 
+#define KBENCH_IMPLEMENTATION
+#include "kbench.h"
+
+#ifdef YUVBENCH_BAD
+Backend yuvbench_bad(void);
+#endif
+
+static struct
+{
+    uint32_t inp_w;
+    uint32_t inp_h;
+    void* inp_buf;
+    size_t inp_len;
+    void* out_buf;
+    size_t out_len;
+} G = { 0 };
+
+static void run_backend(Backend b)
+{
+    Ctx ctx = { 0 };
+    ctx.inp_w = G.inp_w;
+    ctx.inp_h = G.inp_h;
+    ctx.inp_buf = G.inp_buf;
+    ctx.inp_len = G.inp_len;
+    ctx.out_buf = G.out_buf;
+    ctx.out_len = G.out_len;
+
+    if (b.init_fn && !b.init_fn(&ctx)) {
+        printf("Init failed\n");
+        return;
+    }
+
+    if (!b.convert_fn) {
+        printf("No convert function");
+        return;
+    }
+
+    printf("running warnups...\n");
+    int warmup = 20;
+    for (int i = 0; i < warmup; ++i) {
+        b.convert_fn(&ctx);
+    }
+
+    printf("testing...\n");
+    int tests = 200;
+    double* tests_table = calloc(tests, sizeof(double)); assert(tests_table);
+    for (int i = 0; i < tests; ++i) {
+        uintptr_t t0 = KBenchTS();
+        if (!b.convert_fn(&ctx)) {
+            printf("Conversion failed\n");
+            return;
+        }
+        uintptr_t t1 = KBenchTS();
+        tests_table[i] = KBenchElapsedTime(t0, t1);
+    }
+
+    if (b.deinit_fn) {
+        b.deinit_fn(&ctx);
+    }
+
+    double ts_min = -1.0f;
+    double ts_max = -1.0f;
+    double ts_avg = 0.0f;
+    for (int i = 0; i < tests; ++i) {
+        if (ts_min < 0 || tests_table[i] < ts_min) {
+            ts_min = tests_table[i];
+        }
+        if (ts_max < 0 || tests_table[i] > ts_max) {
+            ts_max = tests_table[i];
+        }
+        ts_avg += (tests_table[i] / (double)tests);
+    }
+    printf("min result: %f\n", ts_min);
+    printf("max result: %f\n", ts_max);
+    printf("avg result: %f\n", ts_avg);
+
+#if 0 && (defined(__APPLE__) || defined(__linux__))
+    // Display last result
+    char cmd[512] = { 0 };
+    snprintf(cmd, sizeof(cmd), "ffplay -f rawvideo -pixel_format rgb24 -video_size %dx%d -", G.inp_w, G.inp_h);
+    FILE* pipe_fp = popen(cmd, "w");
+    if (!pipe_fp) {
+        printf("Failed to open ffplay: %s\n", strerror(errno));
+        abort();
+    }
+    fwrite(G.out_buf, 1, G.out_len, pipe_fp);
+    fflush(pipe_fp);
+    if (pclose(pipe_fp) == -1) {
+        printf("Failed to close ffplay: %s\n", strerror(errno));
+        abort();
+    }
+#endif
+}
+
 int main(int argc, char** argv)
 {
     // The source file should be raw YUV 4:2:0 pixel data packed with no padding.
@@ -10,8 +104,6 @@ int main(int argc, char** argv)
     }
 
     // Decode with and height from file name
-    int inp_w = 0;
-    int inp_h = 0;
     {
         // Scan for last "-"
         const char* suffix = 0;
@@ -28,8 +120,8 @@ int main(int argc, char** argv)
         for (; *suffix; ++suffix) {
             const char c = *suffix;
             if (c >= '0' && c <= '9') {
-                inp_w *= 10;
-                inp_w += (int)(c - '0');
+                G.inp_w *= 10;
+                G.inp_w += (int)(c - '0');
             } else if (c == 'x') {
                 ++suffix;
                 break;
@@ -41,8 +133,8 @@ int main(int argc, char** argv)
         for (; *suffix; ++suffix) {
             const char c = *suffix;
             if (c >= '0' && c <= '9') {
-                inp_h *= 10;
-                inp_h += (int)(c - '0');
+                G.inp_h *= 10;
+                G.inp_h += (int)(c - '0');
             } else if (c == '.') {
                 break;
             } else {
@@ -50,6 +142,33 @@ int main(int argc, char** argv)
                 return 1;
             }
         }
+        // Read from disk
+        FILE* f = fopen(argv[1], "rb");
+        if (!f) {
+            printf("Failed to open file: %s\n", strerror(errno));
+            return 1;
+        }
+        fseek(f, 0, SEEK_END);
+        G.inp_len = ftell(f);
+        fseek(f, 0, SEEK_SET);
+        assert(G.inp_len && "Zero-length file");
+        G.inp_buf = calloc(1, G.inp_len);
+        fread(G.inp_buf, 1, G.inp_len, f);
+        fclose(f);
+    }
+    printf("Input image is %dx%d YUV 4:2:0\n", G.inp_w, G.inp_h);
+    printf("Input buffer size: %lu\n", G.inp_len);
+    // 1x full res luminance plane + 2x half res chroma planes
+    const size_t expected_len = (G.inp_w * G.inp_h) + ((G.inp_w / 2 * G.inp_h / 2) * 2);
+    if (G.inp_len != expected_len) {
+        printf("Expected file length %lu but got %lu. Allowing.\n", expected_len, G.inp_len);
     }
-    printf("Input image is %dx%d YUV 4:2:0\n", inp_w, inp_h);
+
+    G.out_len = G.inp_w * G.inp_h * 3; // RGB888
+    G.out_buf = calloc(1, G.out_len);
+
+#ifdef YUVBENCH_BAD
+    run_backend(yuvbench_bad());
+#endif
+
 }
-- 
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