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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2011-02-13 22:49:50 +0300 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2011-02-15 01:58:20 +0300 |
| commit | 7539a1fee2c4935eb3318d625f881df85f2c9c04 (patch) | |
| tree | 79b531353a0c98dc0268ac0bc985284042f7236d /libavcodec/ac3dsp.c | |
| parent | e590448c65b7f9cd1a9bcf39ee6874882034edc9 (diff) | |
ac3enc: Add x86-optimized function to speed up log2_tab().
AC3DSPContext.ac3_max_msb_abs_int16() finds the maximum MSB of the absolute
value of each element in an array of int16_t.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit fbb6b49dabc3398440c6dfa838aa090a7a6ebc0d)
Diffstat (limited to 'libavcodec/ac3dsp.c')
| -rw-r--r-- | libavcodec/ac3dsp.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libavcodec/ac3dsp.c b/libavcodec/ac3dsp.c index f688e6a72b..da3a123e9b 100644 --- a/libavcodec/ac3dsp.c +++ b/libavcodec/ac3dsp.c @@ -42,9 +42,18 @@ static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs) } } +static int ac3_max_msb_abs_int16_c(const int16_t *src, int len) +{ + int i, v = 0; + for (i = 0; i < len; i++) + v |= abs(src[i]); + return v; +} + av_cold void ff_ac3dsp_init(AC3DSPContext *c) { c->ac3_exponent_min = ac3_exponent_min_c; + c->ac3_max_msb_abs_int16 = ac3_max_msb_abs_int16_c; if (HAVE_MMX) ff_ac3dsp_init_x86(c); |