fix: AC9 seek fine re-sync + deterministic decoder drain (WebCodecs Opus)

Seek now trims the lead-in so playback lands at the requested time, not the page start; decoder drain polls decodeQueueSize (bounded) instead of a single timeout. Minor cleanups.
2026-06-23 20:57:05 -04:00
parent 7f3fb74126
commit 5a75da1769
6 changed files with 186 additions and 42 deletions
@@ -155,6 +155,9 @@ export class OggDemuxer {
        const isEos = (headerType & 0x04) !== 0;
        const granule = readUint64LE(header, GRANULE_OFFSET);
        // 0xFFFFFFFFFFFFFFFF (-1) means "no packet completed on this page" — no usable timestamp.
+        // We check the raw bytes rather than comparing `granule === -1` (or the equivalent JS number):
+        // the full 64-bit sentinel exceeds 2^53 and cannot be represented exactly as an IEEE-754 double,
+        // so the parsed value from readUint64LE would not equal the sentinel. The byte check is exact.
        const hasGranule = !(header[GRANULE_OFFSET] === 0xff && header[GRANULE_OFFSET + 1] === 0xff &&
            header[GRANULE_OFFSET + 2] === 0xff && header[GRANULE_OFFSET + 3] === 0xff &&
            header[GRANULE_OFFSET + 4] === 0xff && header[GRANULE_OFFSET + 5] === 0xff &&