[osflash] mp_3 sample count & header info

[jaco - pixeldump]

I've made a test,

http://www.pixeldump.org/exp/test_event_sound02.html

found a casual mp3 on my hdd and built swf file with some linkage symbol 
created in mk and svg text in inkscape:
soundData (500k) was inserted in frame #2 to let viewing wating text.

:)
Jaco - pixeldump

----- Original Message ----- 
From: "jaco - pixeldump" <jaco at pixeldump.org>
To: "Open Source Flash Mailing List" <osflash at osflash.org>
Sent: Thursday, April 27, 2006 5:43 PM
Subject: Re: [osflash] mp_3 sample count & header info


hi list
yep, yesterday I've made some tries and that's what I discovered:

- if flash IDE imports a .wav file and then export in swf as mp3 it use
sampleCount taken from the wav header(that info is provided by fileformat),
so it can be reported numbers that are NO mutiple of 576.
- if mp3 is imported, since sampleCount is not stored, it computes mp3frame
frameNumber * 576

So [maybe] that info it'not critical, it tends to be closer to real sample
count for bigger mp3. I'm going to verify after some coding (mp3frames
handling).

thanx to all helpers

:)
Jaco

----- Original Message ----- 
From: "jaco - pixeldump" <jaco at pixeldump.org>
To: "Open Source Flash Mailing List" <osflash at osflash.org>
Sent: Wednesday, April 26, 2006 6:59 PM
Subject: Re: [osflash] mp_3 sample count & header info


> Many thanx Glen
>
> I'll take a look. I know number in mp3frame is fixed (multiple of 576),
> but
> still i'm not sure, eg. having a regular test case produced from flash
> ide,
> it show up:
>
> soundItem soundID="1" tagSize="1263" format="mp3" rate="22KHz"
> sampleSize="16bit" type="stereo" sampleCount="1012">
>
> 1012 % 576 != 0
>
> - is it sampleCount mandatory and must be precise about number of total
> samples in audio data?
> - how is it computed if there are incomplete mp3frame?
> - am I on the wrong way? Miss some critical info or looking at pointless
> details?
>
> Suspect have to get much test cases and look closer to mp3 handling
> code...
>
> :)
> Jaco
> ----- Original Message ----- 
> From: "Glen Pike" <joined_up_typeski at yahoo.com>
> To: <jaco at pixeldump.org>
> Sent: Wednesday, April 26, 2006 3:50 PM
> Subject: Re: [osflash] mp_3 sample count & header info
>
>
>> Hi,
>>
>>  Sorry if this is off list - I am at work so popping
>> my osflash account, but replying from another.
>>
>>  I had a look at a couple of things - I did some mp3
>> stuff a while ago.
>>
>>  I think the number of samples in a frame is constant
>> - see here
>>
>> http://www.mp3-converter.com/mp3codec/frames.htm
>>
>>  I also had a go at reading MP3 headers with PHP a
>> while ago and found that this package was quite
>> useful.  You would need to have PEAR installed on your
>> webserver, which can be a bit fiddly if you do not
>> have ssh access, but not so bad if you use the HTML
>> installer.  Have a look here for PEAR
>> http://pear.php.net and here for MP3 ID
>> http://pear.php.net/package/MP3_ID
>>
>>  Hope this helps, otherwise you may be spending a
>> long time looking at codec sources.
>>
>>  Glen
>> --- jaco - pixeldump <jaco at pixeldump.org> wrote:
>>
>>> many thanx erixtekila,
>>>
>>> unfortunately afaik such infos are not suitable for
>>> counting samples,
>>> mandatory field to compile well defineSound Tag. So
>>> yet mk cannnot embed
>>> mp_3 audio.
>>> For now I'm snorkeling in ming sound.c source code.
>>>
>>> List, if you know about snippets (regardless prog.
>>> lang.) to count samples
>>> in mp3frame please let me know.
>>>
>>>
>>> :)
>>> Jaco
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "erixtekila" <erixtekila at gmail.com>
>>> To: "Open Source Flash Mailing List"
>>> <osflash at osflash.org>
>>> Sent: Wednesday, April 26, 2006 3:00 PM
>>> Subject: Re: [osflash] mp3 sample count & header
>>> info
>>>
>>>
>>> >> I'm seeking for mp3 file format info:
>>> > Don't if it's enough ?!
>>> > http://www.psionics.demon.co.uk/mp3/mp3info.html
>>> >
>>> > HTH
>>> > -----------
>>> > erixtekila
>>> > http://blog.v-i-a.net/
>>> >
>>> >
>>> > _______________________________________________
>>> > osflash mailing list
>>> > osflash at osflash.org
>>> >
>>>
>> http://osflash.org/mailman/listinfo/osflash_osflash.org
>>> >
>>>
>>>
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>>>
>>>
>>
>>
>>
>>
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