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author | Michael Niedermayer <michaelni@gmx.at> | 2008-08-29 14:44:47 +0000 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2008-08-29 14:44:47 +0000 |
commit | addafb0e0a50c1749071219ce23b289d7a3b9eb5 (patch) | |
tree | dae97aa2c0f1d789f380574206a23498daf9d4ab /libavcodec/dca.c | |
parent | c55ecb9c27a7b46e1a4dc7bfe98b89e345321720 (diff) | |
download | ffmpeg-addafb0e0a50c1749071219ce23b289d7a3b9eb5.tar.gz |
Simplify (drop useless intermediate sum and diff arrays).
Originally committed as revision 15023 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/dca.c')
-rw-r--r-- | libavcodec/dca.c | 13 |
1 files changed, 3 insertions, 10 deletions
diff --git a/libavcodec/dca.c b/libavcodec/dca.c index 8966f6b8b6..57ca6145a5 100644 --- a/libavcodec/dca.c +++ b/libavcodec/dca.c @@ -673,7 +673,7 @@ static void qmf_32_subbands(DCAContext * s, int chans, /* Reconstructed channel sample index */ for (subindex = 0; subindex < 8; subindex++) { - float t1, t2, sum[16], diff[16]; + float t1, t2; /* Load in one sample from each subband and clear inactive subbands */ for (i = 0; i < s->subband_activity[chans]; i++) @@ -690,17 +690,10 @@ static void qmf_32_subbands(DCAContext * s, int chans, t1 += (raXin[2 * i] + raXin[2 * i + 1]) * cos_mod[j]; t2 += (raXin[2 * i] + raXin[2 * i - 1]) * cos_mod[j + 256]; } - sum[k] = t1 + t2; - diff[k] = t1 - t2; + subband_fir_hist[ k ] = cos_mod[k+512 ] * (t1 + t2); + subband_fir_hist[32-k-1] = cos_mod[k+512+16] * (t1 - t2); } - j = 512; - /* Store history */ - for (k = 0; k < 16; k++) - subband_fir_hist[k] = cos_mod[j++] * sum[k]; - for (k = 0; k < 16; k++) - subband_fir_hist[32-k-1] = cos_mod[j++] * diff[k]; - /* Multiply by filter coefficients */ for (k = 31, i = 0; i < 32; i++, k--) for (j = 0; j < 512; j += 64){ |