Initial commit: testpattern → fakesink pipeline over MXL shared memory

- NodeBase, Signal, FlowDef, V210 shared headers - testpattern node: SMPTE 75% color bars writer at 25fps - fakesink node: non-blocking MXL reader with per-second stats - studio-manager: FlowGraph data model, graph-driven fork/exec launcher - mxl pinned as submodule at 0ae1dc5 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-23 13:35:01 +03:00
commit ca682eaf0a
17 changed files with 1269 additions and 0 deletions
@@ -0,0 +1,75 @@
+#pragma once
+#include <array>
+#include <cstddef>
+#include <cstdint>
+
+namespace dmf::v210 {
+
+// SMPTE 75% color bars — 10-bit limited range
+//   Y:     64 (black) to 940 (white)
+//   Cb/Cr: 64 to 960, 512 = neutral grey
+struct Color { uint16_t y, cb, cr; };
+
+constexpr std::array<Color, 7> SMPTE_BARS = {{
+    {721, 512, 512},  // white
+    {674, 176, 543},  // yellow
+    {581, 589, 176},  // cyan
+    {534, 253, 207},  // green
+    {251, 771, 817},  // magenta
+    {204, 435, 848},  // red
+    {111, 848, 481},  // blue
+}};
+
+// Pack 6 pixels into 4 x 32-bit V210 words (16 bytes total).
+//
+// V210 is 4:2:2 — each pair of pixels shares one Cb and one Cr sample.
+// The three pairs in a block map to words like this (bits [9:0],[19:10],[29:20]):
+//   word 0: Cb(pair0) | Y(px0) | Cr(pair0)
+//   word 1: Y(px1)    | Cb(pair1) | Y(px2)
+//   word 2: Cr(pair1) | Y(px3)    | Cb(pair2)
+//   word 3: Y(px4)    | Cr(pair2) | Y(px5)
+inline void pack_block(
+    uint8_t* out,
+    Color p01, uint16_t y0, uint16_t y1,   // pair 0–1
+    Color p23, uint16_t y2, uint16_t y3,   // pair 2–3
+    Color p45, uint16_t y4, uint16_t y5)   // pair 4–5
+{
+    auto* w = reinterpret_cast<uint32_t*>(out);
+    w[0] = (p01.cb & 0x3FFu)        | ((y0     & 0x3FFu) << 10) | ((p01.cr & 0x3FFu) << 20);
+    w[1] = (y1     & 0x3FFu)        | ((p23.cb & 0x3FFu) << 10) | ((y2     & 0x3FFu) << 20);
+    w[2] = (p23.cr & 0x3FFu)        | ((y3     & 0x3FFu) << 10) | ((p45.cb & 0x3FFu) << 20);
+    w[3] = (y4     & 0x3FFu)        | ((p45.cr & 0x3FFu) << 10) | ((y5     & 0x3FFu) << 20);
+}
+
+// Write one horizontal line of SMPTE 75% bars.
+// `stride` is the line size in bytes as returned by MXL (configInfo.discrete.sliceSizes[0]).
+// Bytes beyond the active pixels are already zeroed by the mmap, so no explicit padding needed.
+inline void write_bar_line(uint8_t* line, int width, uint32_t /*stride*/)
+{
+    const int n = static_cast<int>(SMPTE_BARS.size());
+    const int blocks = width / 6;  // one V210 block = 6 pixels = 16 bytes
+
+    for (int b = 0; b < blocks; b++) {
+        int x = b * 6;
+        auto color = [&](int px) -> const Color& {
+            return SMPTE_BARS[static_cast<size_t>(px * n / width)];
+        };
+        const Color& c01 = color(x);
+        const Color& c23 = color(x + 2);
+        const Color& c45 = color(x + 4);
+        pack_block(line + b * 16,
+            c01, c01.y, color(x+1).y,
+            c23, c23.y, color(x+3).y,
+            c45, c45.y, color(x+5).y);
+    }
+}
+
+// Fill an entire frame buffer with SMPTE 75% color bars.
+inline void fill_frame(uint8_t* buf, int width, int height, uint32_t stride)
+{
+    for (int y = 0; y < height; y++) {
+        write_bar_line(buf + static_cast<ptrdiff_t>(y) * stride, width, stride);
+    }
+}
+
+} // namespace dmf::v210