diff options
| author | Andree Buschmann <AndreeBuschmann@t-online.de> | 2012-10-06 14:51:01 +0200 |
|---|---|---|
| committer | Nils Wallménius <nils@rockbox.org> | 2012-10-06 14:51:01 +0200 |
| commit | da67f66eedd38a1576e182f74d354e12949608f9 (patch) | |
| tree | 115ef178fc2c87397659043a21e042a1005da450 | |
| parent | dceec0909295b56c140b83cd6f8d019fddb2b689 (diff) | |
opus: slight speedup of deemphasis
Hoist load of coefficients out of the loop.
Speeds up decoding of a 64kbps test file by 0.6MHz on h300 (cf)
0.2MHz on c200 (pp) and 0.1MHz on fuzev1 (amsv1)
Signed-off-by: Nils Wallménius <nils@rockbox.org>
Change-Id: I4be0059fc2a77748575f5fc9378f7f348d64f1c4
| -rw-r--r-- | lib/rbcodec/codecs/libopus/celt/celt.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/lib/rbcodec/codecs/libopus/celt/celt.c b/lib/rbcodec/codecs/libopus/celt/celt.c index a4e5131a04..4a09cc9905 100644 --- a/lib/rbcodec/codecs/libopus/celt/celt.c +++ b/lib/rbcodec/codecs/libopus/celt/celt.c @@ -466,16 +466,21 @@ static void deemphasis(celt_sig *in[], opus_val16 *pcm, int N, int C, /* int dow int j; celt_sig * OPUS_RESTRICT x; opus_val16 * OPUS_RESTRICT y; + opus_val16 coef0 = coef[0]; +#ifdef CUSTOM_MODES + opus_val16 coef1 = coef[1]; + opus_val16 coef3 = coef[3]; +#endif celt_sig m = mem[c]; x =in[c]; y = pcm+c; for (j=0;j<N;j++) { celt_sig tmp = *x + m; - m = MULT16_32_Q15(coef[0], tmp); + m = MULT16_32_Q15(coef0, tmp); #ifdef CUSTOM_MODES - m -= MULT16_32_Q15(coef[1], *x); - tmp = SHL32(MULT16_32_Q15(coef[3], tmp), 2); + m -= MULT16_32_Q15(coef1, *x); + tmp = SHL32(MULT16_32_Q15(coef3, tmp), 2); #endif x++; /* Technically the store could be moved outside of the if because |