From dda3f0ef48aa5c3b03566b60b6bf63211e1fe579 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Thu, 10 Feb 2011 12:20:36 -0500 Subject: Add x86-optimized versions of exponent_min(). Signed-off-by: Ronald S. Bultje --- libavcodec/ac3dsp.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 libavcodec/ac3dsp.c (limited to 'libavcodec/ac3dsp.c') 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); +} -- cgit v1.2.3