From 55cae3e208dcc5579470f90d16a49ad7331b6b23 Mon Sep 17 00:00:00 2001
From: dyknon <dyknon@r5f.jp>
Date: Fri, 28 Feb 2025 01:26:55 +0900
Subject: make less delay (but not works correctly)

---
 src/bin/sshcamera.rs | 22 +++++-----------
 src/lib.rs           |  1 +
 src/source.rs        | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/v4l2abst.rs      | 12 +++++++++
 4 files changed, 92 insertions(+), 16 deletions(-)
 create mode 100644 src/source.rs

diff --git a/src/bin/sshcamera.rs b/src/bin/sshcamera.rs
index 270700a..1add8cd 100644
--- a/src/bin/sshcamera.rs
+++ b/src/bin/sshcamera.rs
@@ -2,11 +2,12 @@ use anyhow::{anyhow, Result};
 use sshcamera::v4l2::{Device as V4l2, Field};
 use sshcamera::v4l2cairo::V4l2Cairo;
 use sshcamera::gtk;
-use sshcamera::v4l2abst::{CaptStream, RemoteCam};
+use sshcamera::v4l2abst::RemoteCam;
 use sshcamera::io::RWBundle;
+use sshcamera::source;
 use gtk4::glib::ExitCode;
 use std::env;
-use std::io::{self, Read as _, Write as _};
+use std::io;
 use std::process::{Command, Stdio};
 
 fn main() -> Result<ExitCode>{
@@ -21,7 +22,7 @@ fn main() -> Result<ExitCode>{
         let v = V4l2::open(arg1)?;
 
         // TODO: It should be better.
-        let mut c = v.captstream_builder()?
+        let c = v.captstream_builder()?
             .set_pixelformat("MJPG".into())
             //.set_pixelformat("YUYV".into())
             .set_field(Field::None)
@@ -29,19 +30,8 @@ fn main() -> Result<ExitCode>{
         assert!(["YUYV", "MJPG"].contains(&c.pixelformat().as_str()));
         assert!(c.field() == Field::None);
 
-        let mut io = RWBundle(io::stdin(), io::stdout());
-        loop{
-            CaptStream::next(&mut c, |frame|{
-                frame.serialize(&mut io)?;
-                io.flush()?;
-                let mut rb = [0];
-                io.read_exact(&mut rb)?;
-                if rb[0] != 0x2e{
-                    return Err(anyhow!("protocol error"));
-                }
-                Ok(())
-            })??;
-        }
+        let io = RWBundle(io::stdin(), io::stdout());
+        source::main(c, io).and(Ok(ExitCode::SUCCESS))
     }else{
         let child = Command::new(arg1)
             .args(args)
diff --git a/src/lib.rs b/src/lib.rs
index 61a1e4f..13be706 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,3 +5,4 @@ pub mod v4l2;
 pub mod v4l2abst;
 pub mod v4l2cairo;
 pub mod gtk;
+pub mod source;
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!()
+    })
+}
diff --git a/src/v4l2abst.rs b/src/v4l2abst.rs
index 03983bc..a4103fc 100644
--- a/src/v4l2abst.rs
+++ b/src/v4l2abst.rs
@@ -23,6 +23,18 @@ impl<'a> Frame<'a>{
         dst.write_all(self.buf)?;
         Ok(())
     }
+    pub fn clone_in<'b, 'c>(&'b self, buf: &'c mut Vec<u8>)
+    -> Frame<'c>{
+        *buf = self.buf.into();
+        Frame{
+            format: self.format,
+            width: self.width,
+            height: self.height,
+            stride: self.stride,
+            buf,
+            timestamp: self.timestamp,
+        }
+    }
     pub fn deserialize<'b>(src: &'b mut impl Read, buf: &'a mut Vec<u8>)
     -> Result<Self>{
         struct Rh<'c>(&'c mut dyn Read);
-- 
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