1;******************************************************************************
2;* x86 optimized dithering format conversion
3;* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
4;*
5;* This file is part of FFmpeg.
6;*
7;* FFmpeg 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.
11;*
12;* FFmpeg 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.
16;*
17;* You should have received a copy of the GNU Lesser General Public
18;* License along with FFmpeg; if not, write to the Free Software
19;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20;******************************************************************************
21
22%include "libavutil/x86/x86util.asm"
23
24SECTION_RODATA 32
25
26; 1.0f / (2.0f * INT32_MAX)
27pf_dither_scale: times 8 dd 2.32830643762e-10
28
29pf_s16_scale: times 4 dd 32753.0
30
31SECTION_TEXT
32
33;------------------------------------------------------------------------------
34; void ff_quantize(int16_t *dst, float *src, float *dither, int len);
35;------------------------------------------------------------------------------
36
37INIT_XMM sse2
38cglobal quantize, 4,4,3, dst, src, dither, len
39    lea         lenq, [2*lend]
40    add         dstq, lenq
41    lea         srcq, [srcq+2*lenq]
42    lea      ditherq, [ditherq+2*lenq]
43    neg         lenq
44    mova          m2, [pf_s16_scale]
45.loop:
46    mulps         m0, m2, [srcq+2*lenq]
47    mulps         m1, m2, [srcq+2*lenq+mmsize]
48    addps         m0, [ditherq+2*lenq]
49    addps         m1, [ditherq+2*lenq+mmsize]
50    cvtps2dq      m0, m0
51    cvtps2dq      m1, m1
52    packssdw      m0, m1
53    mova     [dstq+lenq], m0
54    add         lenq, mmsize
55    jl .loop
56    REP_RET
57
58;------------------------------------------------------------------------------
59; void ff_dither_int_to_float_rectangular(float *dst, int *src, int len)
60;------------------------------------------------------------------------------
61
62%macro DITHER_INT_TO_FLOAT_RECTANGULAR 0
63cglobal dither_int_to_float_rectangular, 3,3,3, dst, src, len
64    lea         lenq, [4*lend]
65    add         srcq, lenq
66    add         dstq, lenq
67    neg         lenq
68    mova          m0, [pf_dither_scale]
69.loop:
70    cvtdq2ps      m1, [srcq+lenq]
71    cvtdq2ps      m2, [srcq+lenq+mmsize]
72    mulps         m1, m1, m0
73    mulps         m2, m2, m0
74    mova  [dstq+lenq], m1
75    mova  [dstq+lenq+mmsize], m2
76    add         lenq, 2*mmsize
77    jl .loop
78    REP_RET
79%endmacro
80
81INIT_XMM sse2
82DITHER_INT_TO_FLOAT_RECTANGULAR
83INIT_YMM avx
84DITHER_INT_TO_FLOAT_RECTANGULAR
85
86;------------------------------------------------------------------------------
87; void ff_dither_int_to_float_triangular(float *dst, int *src0, int len)
88;------------------------------------------------------------------------------
89
90%macro DITHER_INT_TO_FLOAT_TRIANGULAR 0
91cglobal dither_int_to_float_triangular, 3,4,5, dst, src0, len, src1
92    lea         lenq, [4*lend]
93    lea        src1q, [src0q+2*lenq]
94    add        src0q, lenq
95    add         dstq, lenq
96    neg         lenq
97    mova          m0, [pf_dither_scale]
98.loop:
99    cvtdq2ps      m1, [src0q+lenq]
100    cvtdq2ps      m2, [src0q+lenq+mmsize]
101    cvtdq2ps      m3, [src1q+lenq]
102    cvtdq2ps      m4, [src1q+lenq+mmsize]
103    addps         m1, m1, m3
104    addps         m2, m2, m4
105    mulps         m1, m1, m0
106    mulps         m2, m2, m0
107    mova  [dstq+lenq], m1
108    mova  [dstq+lenq+mmsize], m2
109    add         lenq, 2*mmsize
110    jl .loop
111    REP_RET
112%endmacro
113
114INIT_XMM sse2
115DITHER_INT_TO_FLOAT_TRIANGULAR
116INIT_YMM avx
117DITHER_INT_TO_FLOAT_TRIANGULAR
118