WIP

utils/rankStreamType.ts

@@ -0,0 +1,96 @@
+export function rankStreamType(
+  prevIndex,
+  prevSource,
+  mediaStreams,
+  trackOptions,
+  streamType,
+  isSecondarySubtitle
+) {
+  if (prevIndex == -1) {
+    console.debug(`AutoSet ${streamType} - No Stream Set`);
+    if (streamType == "Subtitle") {
+      if (isSecondarySubtitle) {
+        trackOptions.DefaultSecondarySubtitleStreamIndex = -1;
+      } else {
+        trackOptions.DefaultSubtitleStreamIndex = -1;
+      }
+    }
+    return;
+  }
+
+  if (!prevSource.MediaStreams || !mediaStreams) {
+    console.debug(`AutoSet ${streamType} - No MediaStreams`);
+    return;
+  }
+
+  let bestStreamIndex = null;
+  let bestStreamScore = 0;
+  const prevStream = prevSource.MediaStreams[prevIndex];
+
+  if (!prevStream) {
+    console.debug(`AutoSet ${streamType} - No prevStream`);
+    return;
+  }
+
+  console.debug(
+    `AutoSet ${streamType} - Previous was ${prevStream.Index} - ${prevStream.DisplayTitle}`
+  );
+
+  let prevRelIndex = 0;
+  for (const stream of prevSource.MediaStreams) {
+    if (stream.Type != streamType) continue;
+
+    if (stream.Index == prevIndex) break;
+
+    prevRelIndex += 1;
+  }
+
+  let newRelIndex = 0;
+  for (const stream of mediaStreams) {
+    if (stream.Type != streamType) continue;
+
+    let score = 0;
+
+    if (prevStream.Codec == stream.Codec) score += 1;
+    if (prevRelIndex == newRelIndex) score += 1;
+    if (
+      prevStream.DisplayTitle &&
+      prevStream.DisplayTitle == stream.DisplayTitle
+    )
+      score += 2;
+    if (
+      prevStream.Language &&
+      prevStream.Language != "und" &&
+      prevStream.Language == stream.Language
+    )
+      score += 2;
+
+    console.debug(
+      `AutoSet ${streamType} - Score ${score} for ${stream.Index} - ${stream.DisplayTitle}`
+    );
+    if (score > bestStreamScore && score >= 3) {
+      bestStreamScore = score;
+      bestStreamIndex = stream.Index;
+    }
+
+    newRelIndex += 1;
+  }
+
+  if (bestStreamIndex != null) {
+    console.debug(
+      `AutoSet ${streamType} - Using ${bestStreamIndex} score ${bestStreamScore}.`
+    );
+    if (streamType == "Subtitle") {
+      if (isSecondarySubtitle) {
+        trackOptions.DefaultSecondarySubtitleStreamIndex = bestStreamIndex;
+      } else {
+        trackOptions.DefaultSubtitleStreamIndex = bestStreamIndex;
+      }
+    }
+    if (streamType == "Audio") {
+      trackOptions.DefaultAudioStreamIndex = bestStreamIndex;
+    }
+  } else {
+    console.debug(`AutoSet ${streamType} - Threshold not met. Using default.`);
+  }
+}