opt codec

1. use src width/height to convert yuv
2. align dst yuv to avoid illegal memory access
3. init yuvfmt when new codec
4. move remote reset calls from empty conns judge to emtpy remote conns
   judge

Signed-off-by: 21pages <pages21@163.com>

libs/scrap/src/common/mod.rs

@@ -112,6 +112,10 @@ pub trait TraitCapturer {
 pub trait TraitFrame {
     fn data(&self) -> &[u8];
 
+    fn width(&self) -> usize;
+
+    fn height(&self) -> usize;
+
     fn stride(&self) -> Vec<usize>;
 
     fn pixfmt(&self) -> Pixfmt;
@@ -125,6 +129,7 @@ pub enum Pixfmt {
     I444,
 }
 
+#[derive(Debug, Clone)]
 pub struct EncodeYuvFormat {
     pub pixfmt: Pixfmt,
     pub w: usize,