refactor(mediabunny): [PKG-MB-03] type inputs and cancel owned loads

packages/artplayer-proxy-mediabunny/src/tracks.ts

@@ -0,0 +1,38 @@
+import type { Input, InputAudioTrack, InputVideoTrack } from 'mediabunny'
+import type { PlaybackMedia } from './media'
+import { isHlsSource } from './input'
+
+export async function resolveDuration({ input, videoTrack, audioTrack }: Pick<PlaybackMedia, 'input' | 'videoTrack' | 'audioTrack'>): Promise<number> {
+  const tracks = [videoTrack, audioTrack].filter((track): track is InputVideoTrack | InputAudioTrack => track !== null)
+  const referenceTrack = videoTrack || audioTrack
+  const isLive = Boolean(referenceTrack && await referenceTrack.isLive())
+
+  let duration: number | null = Number.NaN
+  if (tracks.length > 0) {
+    duration = await input.getDurationFromMetadata(tracks, { skipLiveWait: true })
+    if (duration === null && !isLive)
+      duration = await input.computeDuration(tracks, { skipLiveWait: true })
+  }
+  return isLive ? Number.POSITIVE_INFINITY : duration ?? Number.NaN
+}
+
+export async function selectPlaybackTracks(input: Input, src: unknown): Promise<PlaybackMedia> {
+  const videoTrack = await input.getPrimaryVideoTrack()
+  const audioTrack = videoTrack
+    ? await videoTrack.getPrimaryPairableAudioTrack()
+    : await input.getPrimaryAudioTrack()
+  const duration = await resolveDuration({ input, videoTrack, audioTrack })
+  const referenceTrack = videoTrack || audioTrack
+  const isHls = isHlsSource(src)
+
+  return {
+    input,
+    videoTrack,
+    audioTrack,
+    duration,
+    isLive: Number.isFinite(duration) ? false : Boolean(referenceTrack && await referenceTrack.isLive()),
+    isHls,
+    videoMode: isHls ? 'auto' : 'manual',
+    audioMode: isHls ? 'auto' : 'manual',
+  }
+}