Allow the transcoder to be run

.env.example

@@ -1,5 +1,6 @@
 # Useful config options
 LIBRARY_ROOT=/video
+CACHE_ROOT=/tmp/kyoo_cache
 LIBRARY_LANGUAGES=en
 
 # The following two values should be set to a random sequence of characters.

docker-compose.dev.yml

@@ -60,6 +60,7 @@ services:
     volumes:
       - ./transcoder:/app
       - ${LIBRARY_ROOT}:/video
+      - ${CACHE_ROOT}:/cache
 
   ingress:
     image: nginx

docker-compose.prod.yml

@@ -39,6 +39,7 @@ services:
     restart: on-failure
     volumes:
       - ${LIBRARY_ROOT}:/video
+      - ${CACHE_ROOT}:/cache
 
   ingress:
     image: nginx

docker-compose.yml

@@ -39,6 +39,7 @@ services:
     restart: on-failure
     volumes:
       - ${LIBRARY_ROOT}:/video
+      - ${CACHE_ROOT}:/cache
 
   ingress:
     image: nginx

transcoder/Dockerfile

@@ -10,8 +10,8 @@ RUN rm src/lib.rs
 COPY src src
 RUN cargo install --path .
 
-FROM debian:bullseye-slim
-#RUN apt-get update && apt-get install -y extra-runtime-dependencies && rm -rf /var/lib/apt/lists/*
+FROM alpine
+RUN apk add --no-cache ffmpeg
 COPY --from=builder /usr/local/cargo/bin/transcoder ./transcoder
 
 EXPOSE 7666

transcoder/Dockerfile.dev

@@ -1,4 +1,5 @@
-FROM rust
+FROM rust:alpine
+RUN apk add --no-cache musl-dev ffmpeg
 RUN cargo install cargo-watch
 WORKDIR /app
 

transcoder/src/error.rs

@@ -25,8 +25,8 @@ impl error::ResponseError for ApiError {
 	}
 
 	fn status_code(&self) -> StatusCode {
-		match *self {
-			ApiError::BadRequest { error } => StatusCode::BAD_REQUEST,
+		match self {
+			ApiError::BadRequest { error: _ } => StatusCode::BAD_REQUEST,
 			ApiError::InternalError => StatusCode::INTERNAL_SERVER_ERROR,
 		}
 	}

transcoder/src/main.rs

@@ -23,19 +23,24 @@ async fn get_movie_auto(
 	req: HttpRequest,
 	query: web::Path<(String, String)>,
 	transcoder: web::Data<Transcoder>,
-) -> Result<NamedFile, ApiError> {
+) -> Result<String, ApiError> {
 	let (quality, slug) = query.into_inner();
 	let quality = Quality::from_str(quality.as_str()).map_err(|_| ApiError::BadRequest {
 		error: "Invalid quality".to_string(),
 	})?;
 	let client_id = req.headers().get("x-client-id")
-		.ok_or(ApiError::BadRequest { error: String::from("Missing client id. Please specify the X-CLIENT-ID header to a guid constant for the lifetime of the player (but unique per instance)."), })?;
+		.ok_or(ApiError::BadRequest { error: String::from("Missing client id. Please specify the X-CLIENT-ID header to a guid constant for the lifetime of the player (but unique per instance)."), })?
+		.to_str().unwrap();
 
 	let path = paths::get_movie_path(slug);
-
-	todo!()
+	// TODO: Handle start_time that is not 0
+	transcoder
+		.transcode(client_id.to_string(), path, quality, 0)
+		.await
+		.map_err(|_| ApiError::InternalError)
 }
 
+
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
 	let state = web::Data::new(Transcoder::new());

transcoder/src/transcode.rs

@@ -1,8 +1,12 @@
 use rand::distributions::Alphanumeric;
 use rand::{thread_rng, Rng};
-use std::process::{Child, Command};
+use std::process::Stdio;
 use std::str::FromStr;
+use std::sync::atomic::AtomicI32;
+use std::sync::Arc;
 use std::{collections::HashMap, sync::Mutex};
+use tokio::io::{AsyncBufReadExt, BufReader};
+use tokio::process::{Child, Command};
 
 use crate::utils::Signalable;
 
@@ -61,7 +65,7 @@ fn get_transcode_video_quality_args(quality: &Quality) -> Vec<&'static str> {
 }
 
 // TODO: Add audios streams (and transcode them only when necesarry)
-async fn start_transcode(path: &str, quality: &Quality, start_time_sec: f32) -> (String, Child) {
+async fn start_transcode(path: String, quality: Quality, start_time: i32) -> TranscodeInfo {
 	// TODO: Use the out path below once cached segments can be reused.
 	// let out_dir = format!("/cache/{show_hash}/{quality}");
 	let uuid: String = thread_rng()
@@ -70,15 +74,19 @@ async fn start_transcode(path: &str, quality: &Quality, start_time_sec: f32) ->
 		.map(char::from)
 		.collect();
 	let out_dir = format!("/cache/{uuid}");
+	std::fs::create_dir(&out_dir).expect("Could not create cache directory");
 
 	let segment_time = "10";
-	let child = Command::new("ffmpeg")
-		.args(&["-ss", start_time_sec.to_string().as_str()])
-		.args(&["-i", path])
+	let mut child = Command::new("ffmpeg")
+		.args(&["-progress", "pipe:1"])
+		.args(&["-ss", start_time.to_string().as_str()])
+		.args(&["-i", path.as_str()])
 		.args(&["-f", "segment"])
 		.args(&["-segment_list_type", "m3u8"])
+		// Disable the .tmp file to serve it instantly to the client.
+		.args(&["-hls_flags", "temp_files"])
 		// Keep all segments in the list (else only last X are presents, useful for livestreams)
-		.args(&["--segment_list_size", "0"])
+		.args(&["-segment_list_size", "0"])
 		.args(&["-segment_time", segment_time])
 		// Force segments to be exactly segment_time (only works when transcoding)
 		.args(&[
@@ -89,21 +97,53 @@ async fn start_transcode(path: &str, quality: &Quality, start_time_sec: f32) ->
 			"-segment_time_delta",
 			"0.1",
 		])
-		.args(get_transcode_video_quality_args(quality))
+		.args(get_transcode_video_quality_args(&quality))
 		.args(&[
 			"-segment_list".to_string(),
 			format!("{out_dir}/stream.m3u8"),
 			format!("{out_dir}/segments-%02d.ts"),
 		])
+		.stdout(Stdio::piped())
 		.spawn()
 		.expect("ffmpeg failed to start");
-	(uuid, child)
+
+	let stdout = child.stdout.take().unwrap();
+	let info = TranscodeInfo {
+		show: (path, quality),
+		job: child,
+		uuid,
+		start_time,
+		ready_time: Arc::new(AtomicI32::new(0)),
+	};
+	let ready_time = Arc::clone(&info.ready_time);
+
+	tokio::spawn(async move {
+		let mut reader = BufReader::new(stdout).lines();
+		while let Some(line) = reader.next_line().await.unwrap() {
+			if let Some((key, value)) = line.find(':').map(|i| line.split_at(i)) {
+				if key == "out_time_ms" {
+					ready_time.store(
+						value.parse::<i32>().unwrap() / 1000,
+						std::sync::atomic::Ordering::Relaxed,
+					);
+				}
+				// TODO: maybe store speed too.
+			}
+		}
+	});
+
+	// TODO: Wait for 1.5 * segment time after start_time to be ready.
+	return info;
 }
 
 struct TranscodeInfo {
-	show: (String, Quality)
-	job: Child
-	uuid: String
+	show: (String, Quality),
+	// TODO: Store if the process as ended (probably Option<Child> for the job)
+	job: Child,
+	uuid: String,
+	#[allow(dead_code)]
+	start_time: i32,
+	ready_time: Arc<AtomicI32>,
 }
 
 pub struct Transcoder {
@@ -118,22 +158,33 @@ impl Transcoder {
 	}
 
 	pub async fn transcode(
-		&mut self,
+		&self,
 		client_id: String,
 		path: String,
 		quality: Quality,
-		start_time_sec: f32,
-	) {
+		start_time: i32,
+	) -> Result<String, std::io::Error> {
 		// TODO: If the stream is not yet up to start_time (and is far), kill it and restart one at the right time.
 		// TODO: Clear cache at startup/every X time without use.
 		// TODO: cache transcoded output for a show/quality and reuse it for every future requests.
-		if let Some(TranscodeInfo{show: (old_path, old_qual), job, uuid}) = self.running.lock().unwrap().get_mut(&client_id) {
-			if path == *old_path && quality != *old_qual {
-				job.interrupt();
+		if let Some(TranscodeInfo {
+			show: (old_path, old_qual),
+			job,
+			uuid,
+			..
+		}) = self.running.lock().unwrap().get_mut(&client_id)
+		{
+			if path != *old_path || quality != *old_qual {
+				job.interrupt()?;
+			} else {
+				let path = format!("/cache/{uuid}/stream.m3u8", uuid = &uuid);
+				return std::fs::read_to_string(path);
 			}
 		}
 
-		let (uuid, job) = start_transcode(&path, &quality, start_time_sec).await;
-		self.running.lock().unwrap().insert(client_id, TranscodeInfo { show: (path, quality), job, uuid});
+		let info = start_transcode(path, quality, start_time).await;
+		let path = format!("/cache/{uuid}/stream.m3u8", uuid = &info.uuid);
+		self.running.lock().unwrap().insert(client_id, info);
+		std::fs::read_to_string(path)
 	}
 }

transcoder/src/utils.rs

@@ -1,4 +1,4 @@
-use std::{io, process::Child};
+use tokio::{io, process::Child};
 
 extern "C" {
 	fn kill(pid: i32, sig: i32) -> i32;
@@ -26,13 +26,15 @@ pub trait Signalable {
 
 impl Signalable for Child {
 	fn signal(&mut self, signal: i32) -> io::Result<()> {
-		if self.try_wait()?.is_some() {
+		let id = self.id();
+
+		if self.try_wait()?.is_some() || id.is_none() {
 			Err(io::Error::new(
 				io::ErrorKind::InvalidInput,
 				"invalid argument: can't signal an exited process",
 			))
 		} else {
-			crate::utils::signal(self.id() as i32, signal)
+			crate::utils::signal(id.unwrap() as i32, signal)
 		}
 	}
 }