Feature: Implement H.264 and AV1 hardware encoding for remote control

Remark: Need to update FFmpeg static libraries to take effort

client/ScreenCapture.h

@@ -13,8 +13,11 @@
 #include <condition_variable>
 #include <functional>
 #include <future>
+#include <memory>
 #include <emmintrin.h>  // SSE2
-#include "X264Encoder.h"
+#include "common/config.h"
+#include "VideoEncoderBase.h"
+#include "EncoderFactory.h"
 #include "ScrollDetector.h"
 #include "common/file_upload.h"
 
@@ -126,6 +129,7 @@ public:
     ULONG*			 m_BlockSizes;       // 分块差异像素数
     int				 m_BlockNum;         // 分块个数
     int				 m_SendQuality;		 // 发送质量
+    int              m_EncodeLevel;      // 编码级别
 
     LPBITMAPINFO     m_BitmapInfor_Full; // BMP信息
     LPBITMAPINFO     m_BitmapInfor_Send; // 发送的BMP信息
@@ -145,7 +149,7 @@ public:
     int              m_FrameID;          // 帧序号
     int              m_GOP;              // 关键帧间隔
     bool		     m_SendKeyFrame;	 // 发送关键帧
-    CX264Encoder	 *m_encoder;		 // 编码器
+    std::unique_ptr<VideoEncoderBase> m_encoder;  // 编码器，ensureEncoder() lazy 创建，走 EncoderFactory 探测
     int             m_nScreenCount;      // 屏幕数量
     BOOL            m_bEnableMultiScreen;// 多显示器支持
 
@@ -182,14 +186,14 @@ protected:
     int             m_nVScreenHeight = GetSystemMetrics(SM_CYVIRTUALSCREEN);
 
 public:
-    ScreenCapture(int n = 32, BYTE algo = ALGORITHM_DIFF, BOOL all = FALSE) :
+    ScreenCapture(int n = 32, BYTE algo = ALGORITHM_DIFF, BOOL all = FALSE, int level = LEVEL_H264_SOFT) :
         m_ThreadPool(nullptr), m_FirstBuffer(nullptr), m_RectBuffer(nullptr),
         m_BitmapInfor_Full(nullptr), m_bAlgorithm(algo), m_SendQuality(100),
         m_ulFullWidth(0), m_ulFullHeight(0), m_bZoomed(false), m_wZoom(1), m_hZoom(1),
         m_FrameID(0), m_GOP(DEFAULT_GOP), m_iScreenX(0), m_iScreenY(0), m_biBitCount(n),
         m_SendKeyFrame(false), m_encoder(nullptr),
         m_pScrollDetector(nullptr), m_bEnableScrollDetect(false), m_bServerSupportsScroll(false),
-        m_bLastFrameWasScroll(false), m_nScrollDetectInterval(1)
+        m_bLastFrameWasScroll(false), m_nScrollDetectInterval(1), m_EncodeLevel(level)
     {
         SetAlgorithm(algo);
         m_BitmapInfor_Send = nullptr;
@@ -256,7 +260,6 @@ public:
         SAFE_DELETE_ARRAY(m_BlockSizes);
 
         SAFE_DELETE(m_ThreadPool);
-        SAFE_DELETE(m_encoder);
         SAFE_DELETE(m_pScrollDetector);
     }
 
@@ -839,6 +842,19 @@ public:
         return bmpInfo;
     }
 
+    // 编码器 lazy 创建。委托 EncoderFactory 完成"硬编探测 + 软编 fallback"。
+    void ensureEncoder(int width, int height)
+    {
+        if (m_encoder) return;
+        EncoderRequest req;
+        req.width        = width;
+        req.height       = height;
+        req.fps          = 20;
+        req.bitrate_kbps = (m_nBitRate > 0) ? m_nBitRate : (width * height / 1266);
+        req.encodeLevel  = m_EncodeLevel;
+        m_encoder = CreateEncoder(req);
+    }
+
     // 算法+光标位置+光标类型
     virtual LPBYTE GetNextScreenData(ULONG* ulNextSendLength)
     {
@@ -923,13 +939,12 @@ public:
                 uint8_t* encoded_data = nullptr;
                 uint32_t  encoded_size = 0;
                 int width = m_BitmapInfor_Send->bmiHeader.biWidth, height = m_BitmapInfor_Send->bmiHeader.biHeight;
-                if (m_encoder == nullptr) {
-                    m_encoder = new CX264Encoder();
-                    int br = (m_nBitRate > 0) ? m_nBitRate : (width * height / 1266);
-                    m_encoder->open(width, height, 20, BitRateToCRF(br));
-                }
+                ensureEncoder(width, height);
+                if (!m_encoder) return nullptr;
+                m_encoder->forceIDR();  // 协议层 keyframe → 编码器强制 IDR，与 TOKEN_KEYFRAME 语义对齐
                 int err = m_encoder->encode(nextData, 32, 4 * width, width, height, &encoded_data, &encoded_size);
-                if (err) {
+                // encoded_size == 0：硬编首帧延迟（avcodec_receive_packet 返回 EAGAIN），本帧无码流，按失败跳过
+                if (err || encoded_size == 0) {
                     return nullptr;
                 }
                 *ulNextSendLength = 1 + offset + encoded_size;
@@ -953,13 +968,11 @@ public:
                 uint8_t* encoded_data = nullptr;
                 uint32_t  encoded_size = 0;
                 int width = m_BitmapInfor_Send->bmiHeader.biWidth, height = m_BitmapInfor_Send->bmiHeader.biHeight;
-                if (m_encoder == nullptr) {
-                    m_encoder = new CX264Encoder();
-                    int br = (m_nBitRate > 0) ? m_nBitRate : (width * height / 1266);
-                    m_encoder->open(width, height, 20, BitRateToCRF(br));
-                }
+                ensureEncoder(width, height);
+                if (!m_encoder) return nullptr;
                 int err = m_encoder->encode(nextData, 32, 4 * width, width, height, &encoded_data, &encoded_size);
-                if (err) {
+                // encoded_size == 0：硬编首帧延迟，本帧无码流，按失败跳过
+                if (err || encoded_size == 0) {
                     return nullptr;
                 }
                 *ulNextSendLength = 1 + offset + encoded_size;