diff options
author | Justin Ruggles <justin.ruggles@gmail.com> | 2011-02-10 20:20:36 +0300 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2011-02-11 04:54:09 +0300 |
commit | a30ac54a19d27920ec262ebb104e1f48092a3715 (patch) | |
tree | b10fb52d87c891e190faf757d665b7c254dace2c /libavcodec/ac3dsp.c | |
parent | 952f231588c18cd1a95e001c517f2d529017363f (diff) |
Add x86-optimized versions of exponent_min().
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit dda3f0ef48aa5c3b03566b60b6bf63211e1fe579)
Diffstat (limited to 'libavcodec/ac3dsp.c')
-rw-r--r-- | libavcodec/ac3dsp.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/libavcodec/ac3dsp.c b/libavcodec/ac3dsp.c new file mode 100644 index 0000000000..f688e6a72b --- /dev/null +++ b/libavcodec/ac3dsp.c @@ -0,0 +1,51 @@ +/* + * AC-3 DSP utils + * Copyright (c) 2011 Justin Ruggles + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avcodec.h" +#include "ac3dsp.h" + +static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs) +{ + int blk, i; + + if (!num_reuse_blocks) + return; + + for (i = 0; i < nb_coefs; i++) { + uint8_t min_exp = *exp; + uint8_t *exp1 = exp + 256; + for (blk = 0; blk < num_reuse_blocks; blk++) { + uint8_t next_exp = *exp1; + if (next_exp < min_exp) + min_exp = next_exp; + exp1 += 256; + } + *exp++ = min_exp; + } +} + +av_cold void ff_ac3dsp_init(AC3DSPContext *c) +{ + c->ac3_exponent_min = ac3_exponent_min_c; + + if (HAVE_MMX) + ff_ac3dsp_init_x86(c); +} |