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Use a table for PVQ encoding/decoding.

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58.4% speedup (2.4x faster) on test_unit_cwrs32 (no custom modes).
Gives a 3.2% speedup on
 ./opus_demo restricted-lowdelay 48000 2 96000 comp48-stereo.sw /dev/null
 on a 600 MHz Cortex A8.
This commit is contained in:
Timothy B. Terriberry 2013-05-21 18:16:13 -07:00
parent 9d05628407
commit 006273c59f
3 changed files with 342 additions and 389 deletions
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8
celt/modes.c
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@ -345,6 +345,14 @@ CELTMode *opus_custom_mode_create(opus_int32 Fs, int frame_size, int *error)
mode->eBands = compute_ebands(Fs, mode->shortMdctSize, res, &mode->nbEBands);
if (mode->eBands==NULL)
goto failure;
#if !defined(SMALL_FOOTPRINT)
/* Make sure we don't allocate a band larger than our PVQ table.
208 should be enough, but let's be paranoid. */
if ((mode->eBands[mode->nbEBands] - mode->eBands[mode->nbEBands-1])<<LM >
208) {
goto failure;
}
#endif
mode->effEBands = mode->nbEBands;
while (mode->eBands[mode->effEBands] > mode->shortMdctSize)