>
> in the function lame_encode, you take the input buffer with
> for (ch=0; ch<stereo; ch++)
> for (i=0; i<samplesPerFrame; i++)
> mfbuf[ch][i+576+EXTRADELAY]=Buffer[ch][i];
>
> and if there is joint stereo you apply to the input buffer
> if (force_ms)
> for (i=0; i< samplesPerFrame; i++) {
> /* dont overflow the short int */
> double mid = ((int)mfbuf[0][576+i]+(int)mfbuf[1][576+i])/(2.0);
> double side= ((int)mfbuf[0][576+i]-(int)mfbuf[1][576+i])/(2.0);
> mfbuf[0][576+i]=mid;
> mfbuf[1][576+i]=side;
> }
>
> Where has EXTRADELAY disappeared between the two operations on the input
> buffer?
>
The first block of code copies data into mfbuf, adding a delay so
lame will sync with fhg.
The second block of code applies the m/s conversion to the exact 1152
samples that are going to be processed for this frame. Adding EXTRADELAY
to this block should have no effect - it would just perform the m/s
conversion for some samples before they are used by the MDCT transform.
Mark
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