ass to webvtt conversion

1 files changed, 37 insertions, 0 deletions

diff --git a/stream/src/webvtt.rs b/stream/src/webvtt.rs
new file mode 100644
index 0000000..74a12a5
--- /dev/null
+++ b/stream/src/webvtt.rs
@@ -0,0 +1,37 @@
+use anyhow::{anyhow, Context, Result};
+use jellybase::CONF;
+use jellycommon::{stream::StreamSpec, LocalTrack, Node};
+use jellyremuxer::extract::extract_track;
+use jellytranscoder::subtitles::webvtt_from_ass_blocks;
+use tokio::io::{AsyncWriteExt, DuplexStream};
+
+pub async fn webvtt_stream(
+    node: Node,
+    track_sources: Vec<LocalTrack>,
+    spec: StreamSpec,
+    mut b: DuplexStream,
+) -> Result<()> {
+    // TODO cache
+
+    let local_track = track_sources
+        .get(*spec.tracks.get(0).ok_or(anyhow!("no track selected"))?)
+        .ok_or(anyhow!("track does not exist"))?
+        .clone();
+
+    let codec_private = local_track
+        .codec_private
+        .clone()
+        .ok_or(anyhow!("ASS is missing required codec private data"))?;
+
+    let ass_blocks =
+        tokio::task::spawn_blocking(move || extract_track(CONF.library_path.clone(), local_track))
+            .await??;
+
+    let webvtt = webvtt_from_ass_blocks(node.public.title, codec_private, ass_blocks)
+        .context("transcoding subtitles")?;
+
+    tokio::task::spawn(async move {
+        let _ = b.write_all(webvtt.as_bytes()).await;
+    });
+    Ok(())
+}