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Surround analysis should now work for non-20ms frame sizes.

Not well tested.

--- a/src/opus_multistream_encoder.c

+++ b/src/opus_multistream_encoder.c

@@ -222,8 +222,7 @@

 {

    int c;

    int i;

-   /* FIXME: pass LM properly */

-   int LM=3;

+   int LM;

    int pos[8] = {0};

    int upsample;

    int frame_size;

@@ -236,6 +235,10 @@

    upsample = resampling_factor(rate);

    frame_size = len*upsample;

+

+   for (LM=0;LM<=celt_mode->maxLM;LM++)

+      if (celt_mode->shortMdctSize<<LM==frame_size)

+         break;

    ALLOC(in, frame_size+overlap, opus_val32);

    ALLOC(x, len, opus_val16);