换ffmpeg

web_server/src/H264_Encoder.hpp

@@ -0,0 +1,36 @@
+#pragma once
+#include <chrono>
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <span>
+#include <vector>
+
+namespace aethera::web {
+enum class Video_Pixel_Layout : std::uint8_t {
+    bgra,
+    rgba
+};
+
+struct Encoded_Video_Frame {
+    std::vector<std::byte> annex_b{};                       /* 带起始码的完整 H.264 access unit，可直接交给 RTP packetizer。 */
+    std::chrono::microseconds presentation_time{};          /* 从 Plot 帧时钟起点累计的媒体时间戳。 */
+    std::uint64_t sequence{};                               /* 对应 Render_Frame 的单调序号。 */
+    bool key_frame{};                                       /* 本 access unit 是否可独立解码。 */
+};
+
+class H264_Encoder final {
+public:
+    explicit H264_Encoder(double frame_rate);
+    ~H264_Encoder();
+    H264_Encoder(const H264_Encoder&) = delete;
+    H264_Encoder& operator=(const H264_Encoder&) = delete;
+    [[nodiscard]] std::shared_ptr<const Encoded_Video_Frame> encode(
+        std::span<const std::byte> pixels, std::uint32_t width,
+        std::uint32_t height, Video_Pixel_Layout layout,
+        std::uint64_t sequence, std::chrono::microseconds presentation_time);
+private:
+    struct Private;
+    std::unique_ptr<Private> d;
+};
+}