1 ;*****************************************************************************
2 ;* x86-optimized functions for volume filter
3 ;* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
5 ;* This file is part of Libav.
7 ;* Libav is free software; you can redistribute it and/or
8 ;* modify it under the terms of the GNU Lesser General Public
9 ;* License as published by the Free Software Foundation; either
10 ;* version 2.1 of the License, or (at your option) any later version.
12 ;* Libav is distributed in the hope that it will be useful,
13 ;* but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 ;* Lesser General Public License for more details.
17 ;* You should have received a copy of the GNU Lesser General Public
18 ;* License along with Libav; if not, write to the Free Software
19 ;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 ;******************************************************************************
22 %include "libavutil/x86/x86inc.asm"
27 pw_128: times 8 dw 128
31 ;------------------------------------------------------------------------------
32 ; void ff_scale_samples_s16(uint8_t *dst, const uint8_t *src, int len,
34 ;------------------------------------------------------------------------------
37 cglobal scale_samples_s16, 4,4,4, dst, src, len, volume
42 lea lenq, [lend*2-mmsize]
44 ; dst[i] = av_clip_int16((src[i] * volume + 128) >> 8);