fix: ALAC ffprobe bitrate parsing

[Ardakilic]

This PR fixes the ALAC bitrate parsing issue, so ALAC should be identified properly now.

Fixes #15

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Note

Use ffprobe bits_per_raw_sample and parse first valid audio stream, skipping invalid/cover-art lines; update tests accordingly.

• ALAC parsing:
  • Switch ffprobe field from bits_per_sample to bits_per_raw_sample in getALACInfo (both Docker and local).
  • Make parseALACInfo robust: iterate lines, validate rate/bit depth, enforce reasonable sample-rate bounds, and return the first valid audio stream; error if none.
• Tests:
  • Update test to expect first valid audio stream among multiple lines.
  • Add case simulating cover art line following a valid audio stream.

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[Copilot]

Pull Request Overview

This PR fixes ALAC bitrate parsing by updating ffprobe arguments and improving stream selection logic to handle real-world ALAC files that may contain non-audio streams like cover art.

• Updated ffprobe to use bits_per_raw_sample instead of bits_per_sample for more accurate ALAC bitrate detection
• Enhanced parsing logic to iterate through multiple streams and select the first valid audio stream based on reasonable sample rate ranges
• Added validation to skip non-audio streams and handle files with cover art or other metadata streams

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
main.go	Updated ffprobe command arguments and implemented robust stream filtering logic
main_test.go	Added test case for ALAC files with cover art and updated existing test description

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