make less delay (but not works correctly)

1 files changed, 73 insertions, 0 deletions

diff --git a/src/source.rs b/src/source.rs
new file mode 100644
index 0000000..a99bcd2
--- /dev/null
+++ b/src/source.rs
@@ -0,0 +1,73 @@
+use anyhow::{anyhow, Result};
+use std::thread;
+use std::sync::{Mutex, Condvar};
+use crate::v4l2abst::{CaptStream, Frame};
+use std::io::{Read, Write};
+
+struct OwnedFrame(Frame<'static>, Vec<u8>);
+impl OwnedFrame{
+    fn borrow(&self) -> Frame<'_>{
+        Frame{
+            format: self.0.format,
+            width: self.0.width,
+            height: self.0.height,
+            stride: self.0.stride,
+            buf: &self.1,
+            timestamp: self.0.timestamp,
+        }
+    }
+    fn from_ref<'a>(src: &Frame<'a>) -> Self{
+        let r0 = Frame{
+            format: src.format,
+            width: src.width,
+            height: src.height,
+            stride: src.stride,
+            buf: &[],
+            timestamp: src.timestamp,
+        };
+        OwnedFrame(r0, src.buf.into())
+    }
+}
+
+pub fn main(mut cam: impl CaptStream, mut io: impl Read + Write + Send)
+-> Result<()>{
+    let frame: Mutex<Option<OwnedFrame>> = Mutex::new(None);
+    let cv = Condvar::new();
+    thread::scope(|scope|{
+        let iothread = scope.spawn(|| -> Result<()>{
+            loop{
+                let mut frlock = frame.lock().map_err(|e| anyhow!("{}", e))?;
+                while frlock.is_none(){
+                    eprintln!("is none");
+                    frlock = cv.wait(frlock).map_err(|e| anyhow!("{}", e))?;
+                }
+                if let Some(fr) = frlock.take(){
+                    eprintln!("fgot");
+                    drop(frlock);
+                    fr.borrow().serialize(&mut io)?;
+                    io.flush()?;
+
+                    let mut rb = [0];
+                    io.read_exact(&mut rb)?;
+                    if rb[0] != 0x2e{
+                        return Err(anyhow!("protocol error"));
+                    }
+                }
+            }
+        });
+        loop{
+            cam.next(|fr| -> Result<()>{
+                let mut frlock = frame.lock().map_err(|e| anyhow!("{}", e))?;
+                eprintln!("fset");
+                *frlock = Some(OwnedFrame::from_ref(&fr));
+                Ok(())
+            })??;
+            cv.notify_all();
+            if iothread.is_finished(){
+                iothread.join().unwrap()?;
+                break;
+            }
+        }
+        panic!()
+    })
+}