feat: 完善架构优化性能

- 调整音视频架构，提升 RKMPP 编码 MJPEG-->H264 性能，同时解决丢帧马赛克问题；
- 删除多用户逻辑，只保留单用户，支持设置 web 单会话；
- 修复删除体验不好的的回退逻辑，前端页面菜单位置微调；
- 增加 OTG USB 设备动态调整功能；
- 修复 mdns 问题，webrtc 视频切换更顺畅。

libs/hwcodec/src/ffmpeg_hw/mod.rs

@@ -0,0 +1,118 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+use std::{
+    ffi::{CStr, CString},
+    os::raw::c_int,
+};
+
+include!(concat!(env!("OUT_DIR"), "/ffmpeg_hw_ffi.rs"));
+
+#[derive(Debug, Clone)]
+pub struct HwMjpegH264Config {
+    pub decoder: String,
+    pub encoder: String,
+    pub width: i32,
+    pub height: i32,
+    pub fps: i32,
+    pub bitrate_kbps: i32,
+    pub gop: i32,
+    pub thread_count: i32,
+}
+
+pub struct HwMjpegH264Pipeline {
+    ctx: *mut FfmpegHwMjpegH264,
+    config: HwMjpegH264Config,
+}
+
+unsafe impl Send for HwMjpegH264Pipeline {}
+
+impl HwMjpegH264Pipeline {
+    pub fn new(config: HwMjpegH264Config) -> Result<Self, String> {
+        unsafe {
+            let dec = CString::new(config.decoder.as_str()).map_err(|_| "decoder name invalid".to_string())?;
+            let enc = CString::new(config.encoder.as_str()).map_err(|_| "encoder name invalid".to_string())?;
+            let ctx = ffmpeg_hw_mjpeg_h264_new(
+                dec.as_ptr(),
+                enc.as_ptr(),
+                config.width,
+                config.height,
+                config.fps,
+                config.bitrate_kbps,
+                config.gop,
+                config.thread_count,
+            );
+            if ctx.is_null() {
+                return Err(last_error_message());
+            }
+            Ok(Self { ctx, config })
+        }
+    }
+
+    pub fn encode(&mut self, data: &[u8], pts_ms: i64) -> Result<Option<(Vec<u8>, bool)>, String> {
+        unsafe {
+            let mut out_data: *mut u8 = std::ptr::null_mut();
+            let mut out_len: c_int = 0;
+            let mut out_key: c_int = 0;
+            let ret = ffmpeg_hw_mjpeg_h264_encode(
+                self.ctx,
+                data.as_ptr(),
+                data.len() as c_int,
+                pts_ms,
+                &mut out_data,
+                &mut out_len,
+                &mut out_key,
+            );
+            if ret < 0 {
+                return Err(last_error_message());
+            }
+            if out_data.is_null() || out_len == 0 {
+                return Ok(None);
+            }
+            let slice = std::slice::from_raw_parts(out_data, out_len as usize);
+            let mut vec = Vec::with_capacity(slice.len());
+            vec.extend_from_slice(slice);
+            ffmpeg_hw_packet_free(out_data);
+            Ok(Some((vec, out_key != 0)))
+        }
+    }
+
+    pub fn reconfigure(&mut self, bitrate_kbps: i32, gop: i32) -> Result<(), String> {
+        unsafe {
+            let ret = ffmpeg_hw_mjpeg_h264_reconfigure(self.ctx, bitrate_kbps, gop);
+            if ret != 0 {
+                return Err(last_error_message());
+            }
+            self.config.bitrate_kbps = bitrate_kbps;
+            self.config.gop = gop;
+            Ok(())
+        }
+    }
+
+    pub fn request_keyframe(&mut self) {
+        unsafe {
+            let _ = ffmpeg_hw_mjpeg_h264_request_keyframe(self.ctx);
+        }
+    }
+}
+
+impl Drop for HwMjpegH264Pipeline {
+    fn drop(&mut self) {
+        unsafe {
+            ffmpeg_hw_mjpeg_h264_free(self.ctx);
+        }
+        self.ctx = std::ptr::null_mut();
+    }
+}
+
+pub fn last_error_message() -> String {
+    unsafe {
+        let ptr = ffmpeg_hw_last_error();
+        if ptr.is_null() {
+            return String::new();
+        }
+        let cstr = CStr::from_ptr(ptr);
+        cstr.to_string_lossy().to_string()
+    }
+}

libs/hwcodec/src/lib.rs

@@ -1,5 +1,7 @@
 pub mod common;
 pub mod ffmpeg;
+#[cfg(any(target_arch = "aarch64", target_arch = "arm", feature = "rkmpp"))]
+pub mod ffmpeg_hw;
 pub mod ffmpeg_ram;
 
 #[no_mangle]