Make playlist generation async

This should allow other requests to be answered while we wait for ffmpeg
to do its thing.

src/main.rs

@@ -14,8 +14,11 @@ use std::sync::Arc;
 use actix::{Actor, Addr};
 use actix_files::NamedFile;
 use actix_multipart as mp;
-use actix_web::web::{HttpRequest, HttpResponse, Json};
 use actix_web::{get, post, web, App, HttpServer, Responder};
+use actix_web::{
+    middleware,
+    web::{HttpRequest, HttpResponse, Json},
+};
 use notify::{watcher, DebouncedEvent, RecursiveMode, Watcher};
 use rayon::prelude::*;
 use serde::Serialize;
@@ -157,7 +160,7 @@ async fn generate_video(
         let filename = name.to_str().expect("Filename should convert to string");
         let playlist = format!("tmp/{}.m3u8", filename);
         if let Some(path) = is_valid_path(&body.path) {
-            if let Ok(child) = create_playlist(&path.to_str().unwrap(), &playlist) {
+            if let Ok(child) = create_playlist(&path.to_str().unwrap(), &playlist).await {
                 data.stream_manager
                     .do_send(ProcessMessage(playlist.clone(), child));
             }

src/video.rs

@@ -39,7 +39,7 @@ impl Handler<ProcessMessage> for StreamActor {
     }
 }
 
-pub fn create_playlist(video_path: &str, playlist_file: &str) -> Result<Child> {
+pub async fn create_playlist(video_path: &str, playlist_file: &str) -> Result<Child> {
     if Path::new(playlist_file).exists() {
         debug!("Playlist already exists: {}", playlist_file);
         return Err(std::io::Error::from(std::io::ErrorKind::AlreadyExists));
@@ -51,7 +51,7 @@ pub fn create_playlist(video_path: &str, playlist_file: &str) -> Result<Child> {
         .arg("-c:v")
         .arg("h264")
         .arg("-crf")
-        .arg("23")
+        .arg("21")
         .arg("-preset")
         .arg("veryfast")
         .arg("-hls_time")
@@ -67,7 +67,7 @@ pub fn create_playlist(video_path: &str, playlist_file: &str) -> Result<Child> {
 
     let start_time = std::time::Instant::now();
     loop {
-        std::thread::sleep(std::time::Duration::from_secs(1));
+        actix::clock::delay_for(std::time::Duration::from_secs(1)).await;
 
         if Path::new(playlist_file).exists()
             || std::time::Instant::now() - start_time > std::time::Duration::from_secs(5)