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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2010-12-16 03:13:41 +0000 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2010-12-16 03:13:41 +0000 |
| commit | 9d8533368f55e1f6a0ea30d6492b26399b030066 (patch) | |
| tree | 0082d6ca16f505d2a33d19dbc546c57975bed5d8 /libavcodec | |
| parent | b6f6204db9621f7ee6430795b1553ccabc2f326a (diff) | |
Use memcpy() instead of a for loop in mdct512().
8% faster in function.
Originally committed as revision 26027 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/ac3enc.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c index bd497832fa..e041a4159e 100644 --- a/libavcodec/ac3enc.c +++ b/libavcodec/ac3enc.c @@ -339,8 +339,7 @@ static void mdct512(int32_t *out, int16_t *in) /* shift to simplify computations */ for (i = 0; i < MDCT_SAMPLES/4; i++) rot[i] = -in[i + 3*MDCT_SAMPLES/4]; - for (;i < MDCT_SAMPLES; i++) - rot[i] = in[i - MDCT_SAMPLES/4]; + memcpy(&rot[MDCT_SAMPLES/4], &in[0], 3*MDCT_SAMPLES/4*sizeof(*in)); /* pre rotation */ for (i = 0; i < MDCT_SAMPLES/4; i++) { |