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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: any mp3 library bindings?
Date: Thu, 8 Feb 2018 17:41:45 +0100
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Date: 2018-02-08T17:41:45+01:00
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On 02/08/2018 06:23 AM, Stephen Leake wrote:
> I'm working on a web interface to my music library, and I need to read the meta info from each music file; ie, read the mp3 tags.
> 
> I found ffmpeg (https://ffmpeg.org/), which provides a C interface. Does anyone have Ada bindings for that, or another mp3 library?

Gnoga has an Audio_Type, child of Multimedia_Type, which can load and play MP3s. 
It has these functions to query its state:

    function Loop_Media (Media : Multimedia_Type) return Boolean;

    function Media_Duration (Media : Multimedia_Type) return Float;
    --  Returns the duration of Media in seconds.

    function Media_Source (Media : Multimedia_Type) return String;
    --  Returns the URL of the current Media

    function Media_Position (Media : Multimedia_Type) return Float;
    --  Position of Media in seconds

    function Muted (Media : Multimedia_Type) return Boolean;

    function Paused (Media : Multimedia_Type) return Boolean;

    function Playback_Ended (Media : Multimedia_Type) return Boolean;
    --  Returns true of Media position has reached end of its duration

    function Playback_Rate (Media : Multimedia_Type) return Float;
    --  Playback rate.
    --  Common values - 1.0 normal, 0.5 half speed, -1.0 reverse

    function Ready_To_Play (Media : Multimedia_Type) return Boolean;
    --  True if media is ready to be played in element

    function Seeking (Media : Multimedia_Type) return Boolean;
    --  True if user is seeking through media

    function Volume (Media : Multimedia_Type) return Volume_Range;
    --  Media volume (not system volumne) in Volume_Range

I don't know if this helps.

-- 
Jeff Carter
"Perfidious English mouse-dropping hoarders."
Monty Python & the Holy Grail
10