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https://issues.apache.org/jira/browse/TIKA-991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oliver Heger updated TIKA-991:
------------------------------
Attachment: TIKA-991.patch
A patch implementing the extraction of an MP3 file's duration. The patch uses
two helper classes, {{MpegStream}} and {{TailStream}} to iterate over all
frames in the audio file. The functionality for interpreting frame headers has
been moved into the {{MpegStream}} class; this seemed to be clearer to me.
This patch also fixes the issue reported in TIKA-990.
> Mp3Parser cannot extract the duration of an audio file
> ------------------------------------------------------
>
> Key: TIKA-991
> URL: https://issues.apache.org/jira/browse/TIKA-991
> Project: Tika
> Issue Type: Improvement
> Components: parser
> Affects Versions: 1.2
> Reporter: Oliver Heger
> Labels: patch
> Attachments: TIKA-991.patch
>
>
> The duration of an MP3 file is an important information. Currently,
> {{Mp3Parser}} is not able to extract this data from a file.
> Unfortunately, it is not easy to implement this functionality with the
> current design of the {{Mp3Parser}} class. In order to obtain the duration,
> all audio frames have to be read, and their durations have to be summed up.
> Currently, only the beginning (the ID3v2 tags) and the end (lyrics and ID3v1)
> are evaluated. Processing the whole file would have additional benefits, e.g.
> MP3s with variable bit rates could be detected.
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