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Antique
Obtain mp3 info?
Posted on: 2011/12/4 2:19    #1
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Is there an easy/smart way of obtaining the lenght of an mp3 song? In minutes that is and not file lengt.

X5000
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Raziel
Re: Obtain mp3 info?
Posted on: 2011/12/4 8:39    #2
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deleted so one who quickly glances over this thread doesn't use this completely useless code (for the OP's question, that is)

the right answer will follow later in this thread


Also, be sure you are not truncating/rounding the time when calculating minutes in the divide by 60 division...








OK, before someone thinks i can code
Here's the source

Not sure if it is what you are looking for

EDIT: Removed useless code


Edited by Raziel on 2011/12/5 22:01:19
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salass00
Re: Obtain mp3 info?
Posted on: 2011/12/4 9:54    #3
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Using mpega.library:
#include <libraries/mpega.h>
#include <proto/mpega.h>

static const MPEGA_CTRL mpa_ctrl = {
    NULL,
    { FALSE, { 1, 2, 44100 }, { 1, 2, 44100 } },
    { FALSE, { 1, 2, 44100 }, { 1, 2, 44100 } },
    0,
    0
};

int32 GetMP3Duration (CONST_STRPTR filename) {
    MPEGA_STREAM *stream;
    int32 ms_duration = 0;
    stream = MPEGA_open((STRPTR)filename, (MPEGA_CTRL *)&mpa_ctrl);
    if (stream) {
        ms_duration = stream->ms_duration;
        MPEGA_close(stream);
    }
    return ms_duration;
}


This function returns the duration of the MP3 file in milliseconds (1ms = 0.001s). Converting this to minutes is trivial enough that I don't think I have to provide code for this, plus you can then decide for yourself if you want to use rounding or not.

Note that not all MP3 files (IIRC) contain duration information so in this case the function will return 0 (same applies if the file can't be opened by mpega.library for some reason).


Edited by salass00 on 2011/12/4 10:34:57
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salass00
Re: Obtain mp3 info?
Posted on: 2011/12/4 10:34    #4
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Version using mpg123.library (untested):
#include <libraries/mpg123.h>
#include <proto/mpg123.h>

int32 GetMP3Duration (CONST_STRPTR filename) {
    mpg123_handle *mh;
    int32 ms_duration = 0;
    mh = mpg123_new(NULL, NULL);
    if (mh) {
        if (mpg123_open(mh, filename) == MPG123_OK) {
            mpg123_frameinfo fi;
            int32 samples;
            if (mpg123_info(mh, &fi) == MPG123_OK &&
                (samples = mpg123_length(mh)) >= 0)
            {
                ms_duration = ((int64)length * 1000) / fi.rate;
            }
            mpg123_close(mh);
        }
        mpg123_delete(mh);
    }
    return ms_duration;
}


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Antique
Re: Obtain mp3 info?
Posted on: 2011/12/4 13:35    #5
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Thanks guys. I will see what i can make out of this.

X5000
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nbache
Re: Obtain mp3 info?
Posted on: 2011/12/4 16:43    #6
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Quote:
Raziel wrote:

OK, before someone thinks i can code
Here's the source

Not sure if it is what you are looking for
At least you have proved you can use Google . Unfortunately:

- the code is in C# which is not available on AmigaOS - this particular snippet is not too difficult for a developer to translate to another language, though.

- what's worse is that the code will only work for MP3 files encoded to a particular bitrate and quality etc., as it assumes a direct relationship between the filesize in bytes (which is what it gets from the FileInfo object) and the playing time. I usually encode all my MP3 files to a bitrate of192 kb/s and using the joint stereo setting (not sure if the latter changes the byte length), so it would fail miserably with my files.

In short, Antique, you'd better go with one of salass00's methods.

Best regards,

Niels
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elfpipe
Re: Obtain mp3 info?
Posted on: 2011/12/4 16:51    #7
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Quote:
- what's worse is that the code will only work for MP3 files encoded to a particular bitrate and quality


Or worse yet, it wont work with any mp3's at all. Raziel's code is meant for use with DSS files, not mp3's.
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nbache
Re: Obtain mp3 info?
Posted on: 2011/12/4 18:16    #8
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Quote:
alfkil wrote:

Or worse yet, it wont work with any mp3's at all. Raziel's code is meant for use with DSS files, not mp3's.
Whooops - didn't even notice that .

Best regards,

Niels
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Antique
Re: Obtain mp3 info?
Posted on: 2011/12/4 18:24    #9
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Hm, i can't seem to find the include files. Did not find them in the mpega file on the depot.
X5000
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Thematic
Re: Obtain mp3 info?
Posted on: 2011/12/4 20:17    #10
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This one has includes: http://aminet.net/package/util/libs/mpega_library

I suppose they work?
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Raziel
Re: Obtain mp3 info?
Posted on: 2011/12/4 20:43    #11
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Hehe

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salass00
Re: Obtain mp3 info?
Posted on: 2011/12/4 21:04    #12
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@Antique

I had OS4 includes for mpega.library generated for diskimage.device but it seems that I deleted them from the SVN when I switched to using mpg123.library instead. If you want I can regenerate and upload them for you tomorrow (shouldn't take many minutes to do).
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salass00
Re: Obtain mp3 info?
Posted on: 2011/12/5 8:11    #13
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http://dl.dropbox.com/u/26599983/mpega_os4_includes.7z

Just extract the archive into "SDK:local/common/include".
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Antique
Re: Obtain mp3 info?
Posted on: 2011/12/5 20:02    #14
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@salass00

Done that. But all i get is some errors when compiling. Not sure why. I have added the 2 includes aswell.
This one makes no difference if i have or not in the program....
#include <libraries/mpega.h>

The error code. Seems like some missing/wrong header file....?

/tmp/cc067KJ5.o: In function `GetMP3Duration.12662':
test2.c:(.text+0x1c42): undefined reference to `IMpega'
test2.c:(.text+0x1c46): undefined reference to `IMpega'
test2.c:(.text+0x1c52): undefined reference to `IMpega'
test2.c:(.text+0x1c56): undefined reference to `IMpega'
test2.c:(.text+0x1c8e): undefined reference to `IMpega'
/tmp/cc067KJ5.o:test2.c:(.text+0x1c92): more undefined references to `IMpega' follow
X5000
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salass00
Re: Obtain mp3 info?
Posted on: 2011/12/5 21:41    #15
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@Antique

You need to add code for opening and closing the library.

struct Library *MPEGABase;
struct MpegaIFace *IMpega;
/* ... */
MPEGABase = OpenLibrary("mpega.library", 0);
IMpega = (struct MpegaIFace *)GetInterface(MPEGABase, "main", 1, NULL);
if (IMpega) {
    /* mpega.library successfully opened,
       do something with it */
} else {
    fprintf(stderr, "Failed to open mpega.library!\\n");
}
DropInterface((struct Interface *)IMpega);
CloseLibrary(MPEGABase);

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centaurz
Re: Obtain mp3 info?
Posted on: 2011/12/5 21:42    #16
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@Antique

Maybe you should declare and open the library ?

Quote:

struct MpegaIFace IMpega = NULL;
struct Library *MPEGABase = NULL;

/* ... */

MPEGABase = OpenLibrary("mpega.library", 0);

IMpega = (struct MpegaIFace *)GetInterface(MPEGABase, "main", 1, NULL);



Edit: Salass00 faster + fixed libbase name
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