Problem: All FLAC files with the same format (44.1kHz, stereo, 16-bit)
had identical headers and thus the same pk (071c5713d5cf485ca688832207bef0f9).
This caused the cache to think all tracks were the same file, regardless
of channel selection or actual content.
Solution: Skip the FLAC header (first 512 bytes) and calculate the pk
from bytes 512-1024 (actual audio content) instead. This ensures each
track gets a unique pk based on its actual audio data, not just its
format header.
Changes:
- Modified add_from_reader_with_pk() to read 1024 bytes instead of 512
- Use bytes 512-1024 for pk calculation when explicit_pk is None
- This works even with poor metadata (empty artist/title)
- Maintains backward compatibility with explicit_pk parameter
Fixes the issue where changing radio channel played the same song.
3bd2a33497