On Friday, May 24, 2002, at 10:48 AM, Mark Taylor wrote:
>> I need to know exact time slices lengths (in bytes) for MPEG layers. For
>> example 44,1kHz MP3 has time slice cca 4ms for short frame.
>>
>> MPEG1 L3 short
>> MPEG1 L3 long
>> MPEG1 L2
>> MPEG1 L1
>> MPEG2 L3 short
>> MPEG2 L3 long
>> MPEG2 L2
>> MPEG2 L1
>>
>> Many thanks Jaroslav Lukesh
>
> The framesizes are always fixed: for MPEG1 L3, it's 576 samples
> for long blocks, 192 for short blocks. So to get the length
> just devide the number of samples by the samplerate.
Since short blocks come in threes, the total number of samples per granule
is the same: 576. In MPEG-1 Layer III, there are two granules per frame,
so the total number of samples per frame is 1152.
> I'm not sure, but I believe MPEG1 L1 and L2 only has frames
> of 1024 samples.
Layer I frames always have 384 samples. Layer II frames always have 1152
samples.
A nice summary of samples per frame is here:
http://board.mp3-tech.org/view.php3?bn=agora_mp3techorg&key=1019510889
As Mark says, divide the number of samples by the sampling frequency to
get playing time in seconds.
--
Rob Leslie
[EMAIL PROTECTED]
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