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| author | Andree Buschmann <AndreeBuschmann@t-online.de> | 2011-05-08 19:36:08 +0000 |
|---|---|---|
| committer | Andree Buschmann <AndreeBuschmann@t-online.de> | 2011-05-08 19:36:08 +0000 |
| commit | f79769c541eb7235b09625cb084dfdfe6069cb96 (patch) | |
| tree | 8a12930deb803c70277f17981bce9414c6dc6788 /apps/codecs/libfaad/ms.c | |
| parent | 7d4616ea4070caec92af0aa8866177bc4ec7a066 (diff) | |
| download | rockbox-f79769c541eb7235b09625cb084dfdfe6069cb96.zip rockbox-f79769c541eb7235b09625cb084dfdfe6069cb96.tar.gz rockbox-f79769c541eb7235b09625cb084dfdfe6069cb96.tar.bz2 rockbox-f79769c541eb7235b09625cb084dfdfe6069cb96.tar.xz | |
Minor loop optimization in libfaad's is/ms decoding.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29837 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/libfaad/ms.c')
| -rw-r--r-- | apps/codecs/libfaad/ms.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/apps/codecs/libfaad/ms.c b/apps/codecs/libfaad/ms.c index f01e5ca..b42e95a 100644 --- a/apps/codecs/libfaad/ms.c +++ b/apps/codecs/libfaad/ms.c @@ -41,7 +41,6 @@ void ms_decode(ic_stream *ics, ic_stream *icsr, real_t *l_spec, real_t *r_spec, uint16_t nshort = frame_len/8; uint16_t i, k; - real_t tmp; if (ics->ms_mask_present >= 1) { @@ -58,12 +57,12 @@ void ms_decode(ic_stream *ics, ic_stream *icsr, real_t *l_spec, real_t *r_spec, if ((ics->ms_used[g][sfb] || ics->ms_mask_present == 2) && !is_intensity(icsr, g, sfb) && !is_noise(ics, g, sfb)) { - for (i = ics->swb_offset[sfb]; i < ics->swb_offset[sfb+1]; i++) + k = (group*nshort) + ics->swb_offset[sfb]; + for (i = ics->swb_offset[sfb]; i < ics->swb_offset[sfb+1]; i++, k++) { - k = (group*nshort) + i; - tmp = l_spec[k] - r_spec[k]; + /* L' = L+R, R' = L-R */ l_spec[k] = l_spec[k] + r_spec[k]; - r_spec[k] = tmp; + r_spec[k] = l_spec[k] - (r_spec[k]<<1); } } } |