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;*****************************************************************************
;* x86-optimized functions for volume filter
;* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
;*
;* This file is part of Libav.
;*
;* Libav 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.
;*
;* Libav 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 Libav; if not, write to the Free Software
;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;******************************************************************************
%include "libavutil/x86/x86inc.asm"
SECTION_RODATA 32
pw_1: times 8 dw 1
pw_128: times 8 dw 128
SECTION_TEXT
;------------------------------------------------------------------------------
; void ff_scale_samples_s16(uint8_t *dst, const uint8_t *src, int len,
; int volume)
;------------------------------------------------------------------------------
INIT_XMM sse2
cglobal scale_samples_s16, 4,4,4, dst, src, len, volume
movd m0, volumem
pshuflw m0, m0, 0
punpcklwd m0, [pw_1]
mova m1, [pw_128]
lea lenq, [lend*2-mmsize]
.loop:
; dst[i] = av_clip_int16((src[i] * volume + 128) >> 8);
mova m2, [srcq+lenq]
punpcklwd m3, m2, m1
punpckhwd m2, m1
pmaddwd m3, m0
pmaddwd m2, m0
psrad m3, 8
psrad m2, 8
packssdw m3, m2
mova [dstq+lenq], m3
sub lenq, mmsize
jge .loop
REP_RET
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