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MP3 Duration about minimp3 HOT 2 CLOSED

tosone avatar tosone commented on July 26, 2024
MP3 Duration

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Comments (2)

tosone avatar tosone commented on July 26, 2024 1

No, minimp3 just for decode mp3. But this repo can get all kinds of files' duration.

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lieff avatar lieff commented on July 26, 2024 1

In general case all file must be parsed to calculate the duration.
You can use mp3dec_iterate/mp3dec_iterate_buf to iterate through all frames and analyse headers using hdr_frame_samples().
Even in this case fast parser method can produce slightly incorrect result in case if not all frames are decodable (this is normal situation for cut`ed mp3's with not decodable start frame(s)).
But if we know that mp3 file is CBR, all frames are decodable and no padding - then duration calculation is trivial. Then we only need to analyse first frame, calc nframes=file_size/first_frame_size, calc samples=nframes*hdr_frame_samples(first_header) and calc duration from samples.

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