54 lines
1.9 KiB
NASM
54 lines
1.9 KiB
NASM
;******************************************************************************
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;* x86 optimized dithering format conversion
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;* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
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;*
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;* This file is part of Libav.
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;*
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;* Libav is free software; you can redistribute it and/or
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;* modify it under the terms of the GNU Lesser General Public
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;* License as published by the Free Software Foundation; either
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;* version 2.1 of the License, or (at your option) any later version.
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;*
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;* Libav is distributed in the hope that it will be useful,
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;* but WITHOUT ANY WARRANTY; without even the implied warranty of
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;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;* Lesser General Public License for more details.
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;*
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;* You should have received a copy of the GNU Lesser General Public
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;* License along with Libav; if not, write to the Free Software
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;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;******************************************************************************
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%include "libavutil/x86/x86util.asm"
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SECTION_RODATA 32
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pf_s16_scale: times 4 dd 32753.0
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SECTION_TEXT
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;------------------------------------------------------------------------------
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; void ff_quantize(int16_t *dst, float *src, float *dither, int len);
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;------------------------------------------------------------------------------
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INIT_XMM sse2
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cglobal quantize, 4,4,3, dst, src, dither, len
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lea lenq, [2*lend]
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add dstq, lenq
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lea srcq, [srcq+2*lenq]
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lea ditherq, [ditherq+2*lenq]
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neg lenq
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mova m2, [pf_s16_scale]
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.loop:
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mulps m0, m2, [srcq+2*lenq]
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mulps m1, m2, [srcq+2*lenq+mmsize]
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addps m0, [ditherq+2*lenq]
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addps m1, [ditherq+2*lenq+mmsize]
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cvtps2dq m0, m0
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cvtps2dq m1, m1
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packssdw m0, m1
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mova [dstq+lenq], m0
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add lenq, mmsize
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jl .loop
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REP_RET
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