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Topic: Calculating frame sizes (Read 2614 times) previous topic - next topic
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Calculating frame sizes

I'm trying to calculate the frame size of an MP3 frame using this formula that I found here.

The formula is:
Code: [Select]
FrameLengthInBytes = 144 * BitRate / SampleRate + Padding
When inserting values I get:
Code: [Select]
144 * 128000 / 44100 + 0 = 417,95918367346938775510204081633
I was expecting a whole number. The result is very close to 418, but not quite there. Is the formula wrong? Should I Int() the number, or Round() it?

Calculating frame sizes

Reply #1 –
You should always Trunc() or Int() it.

From the link you mentioned:

Quote
Example:
Layer III, BitRate=128000, SampleRate=441000, Padding=0
      ==>  FrameSize=417 bytes


So if Padding=1 the frame would be 418 bytes.