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;******************************************************************************
;* x86 optimized dithering format conversion
;* 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/x86util.asm"
SECTION_RODATA 32
; 1.0f / (2.0f * INT32_MAX)
pf_dither_scale: times 8 dd 2.32830643762e-10
pf_s16_scale: times 4 dd 32753.0
SECTION_TEXT
;------------------------------------------------------------------------------
; void ff_quantize(int16_t *dst, float *src, float *dither, int len);
;------------------------------------------------------------------------------
INIT_XMM sse2
cglobal quantize, 4,4,3, dst, src, dither, len
lea lenq, [2*lend]
add dstq, lenq
lea srcq, [srcq+2*lenq]
lea ditherq, [ditherq+2*lenq]
neg lenq
mova m2, [pf_s16_scale]
.loop:
mulps m0, m2, [srcq+2*lenq]
mulps m1, m2, [srcq+2*lenq+mmsize]
addps m0, [ditherq+2*lenq]
addps m1, [ditherq+2*lenq+mmsize]
cvtps2dq m0, m0
cvtps2dq m1, m1
packssdw m0, m1
mova [dstq+lenq], m0
add lenq, mmsize
jl .loop
REP_RET
;------------------------------------------------------------------------------
; void ff_dither_int_to_float_rectangular(float *dst, int *src, int len)
;------------------------------------------------------------------------------
%macro DITHER_INT_TO_FLOAT_RECTANGULAR 0
cglobal dither_int_to_float_rectangular, 3,3,3, dst, src, len
lea lenq, [4*lend]
add srcq, lenq
add dstq, lenq
neg lenq
mova m0, [pf_dither_scale]
.loop:
cvtdq2ps m1, [srcq+lenq]
cvtdq2ps m2, [srcq+lenq+mmsize]
mulps m1, m1, m0
mulps m2, m2, m0
mova [dstq+lenq], m1
mova [dstq+lenq+mmsize], m2
add lenq, 2*mmsize
jl .loop
REP_RET
%endmacro
INIT_XMM sse2
DITHER_INT_TO_FLOAT_RECTANGULAR
INIT_YMM avx
DITHER_INT_TO_FLOAT_RECTANGULAR
;------------------------------------------------------------------------------
; void ff_dither_int_to_float_triangular(float *dst, int *src0, int len)
;------------------------------------------------------------------------------
%macro DITHER_INT_TO_FLOAT_TRIANGULAR 0
cglobal dither_int_to_float_triangular, 3,4,5, dst, src0, len, src1
lea lenq, [4*lend]
lea src1q, [src0q+2*lenq]
add src0q, lenq
add dstq, lenq
neg lenq
mova m0, [pf_dither_scale]
.loop:
cvtdq2ps m1, [src0q+lenq]
cvtdq2ps m2, [src0q+lenq+mmsize]
cvtdq2ps m3, [src1q+lenq]
cvtdq2ps m4, [src1q+lenq+mmsize]
addps m1, m1, m3
addps m2, m2, m4
mulps m1, m1, m0
mulps m2, m2, m0
mova [dstq+lenq], m1
mova [dstq+lenq+mmsize], m2
add lenq, 2*mmsize
jl .loop
REP_RET
%endmacro
INIT_XMM sse2
DITHER_INT_TO_FLOAT_TRIANGULAR
INIT_YMM avx
DITHER_INT_TO_FLOAT_TRIANGULAR
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