Enhancement: Extract audio technical properties (bitrate, sample rate, duration)

[rpuneet]

Summary

exiftool extracts technical audio properties that imx currently doesn't expose.

Missing Properties (MP3)

Property	exiftool Value	imx
MPEGAudioVersion	1	-
AudioLayer	3	-
AudioBitrate	192 kbps	-
SampleRate	44100	-
ChannelMode	Single Channel	-
Duration	5.07 s (approx)	-

Use Cases

• Media library applications need bitrate/sample rate info
• Duration is essential for audio players
• Channel mode (mono/stereo) affects playback

Technical Approach

MP3 frame header contains: bitrate, sample rate, channel mode
Duration = file size / bitrate (approximate)

Acceptance Criteria

• Extract audio properties from MP3 frame headers
• Add similar support for FLAC (sample rate, channels from StreamInfo)
• Consider adding to MP4/M4A as well
• Unit tests

Priority

Low - Enhancement, not a bug. Marking as such.

Note

This is an enhancement, not a bug fix. Lower priority than the decoding issues.