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| author | Mans Rullgard <mans@mansr.com> | 2011-09-28 21:00:35 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2011-10-01 20:52:09 +0200 |
| commit | 626f11b3bc92011896ae2502788adb423cbd74d9 (patch) | |
| tree | 6af7dcf9a18cae8e887adba4543e38e0ab39899e | |
| parent | 8d61c684423c0b78d8ab076fef00d7095e339a97 (diff) | |
| download | ffmpeg-626f11b3bc92011896ae2502788adb423cbd74d9.tar.gz | |
dca: clear inactive subbands only once in qmf_32_subbands()
Writing zeros to the high entries in the array need only be
done once as the cutoff position is constant throughout the
loop.
Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit bf00a73ace9b1aba790b75dcb26d43adfceb769f)
| -rw-r--r-- | libavcodec/dca.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libavcodec/dca.c b/libavcodec/dca.c index 5166fc5337..69df8f4597 100644 --- a/libavcodec/dca.c +++ b/libavcodec/dca.c @@ -898,6 +898,9 @@ static void qmf_32_subbands(DCAContext * s, int chans, else /* Perfect reconstruction */ prCoeff = fir_32bands_perfect; + for (i = sb_act; i < 32; i++) + s->raXin[i] = 0.0; + /* Reconstructed channel sample index */ for (subindex = 0; subindex < 8; subindex++) { /* Load in one sample from each subband and clear inactive subbands */ @@ -905,8 +908,6 @@ static void qmf_32_subbands(DCAContext * s, int chans, uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ ((i-1)&2)<<30; AV_WN32A(&s->raXin[i], v); } - for (; i < 32; i++) - s->raXin[i] = 0.0; s->synth.synth_filter_float(&s->imdct, s->subband_fir_hist[chans], &s->hist_index[chans], |