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/*

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 * Copyright (C) 2013 Xiaolei Yu <[email protected]>

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 *

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 * This file is part of FFmpeg.

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 *

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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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 "rgb2yuv_neon_common.S"

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/* downsampled R16G16B16 x8 */

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alias_qw    r16x8,  q7

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alias_qw    g16x8,  q8

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alias_qw    b16x8,  q9

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alias   n16x16_o,   q11

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alias   n16x16_ol,  q11_l

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alias   n16x16_oh,  q11_h

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alias   y32x16_el,  q12

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alias   y32x16_eh,  q13

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alias   y32x16_ol,  q14

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alias   y32x16_oh,  q15

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alias   y16x16_e,   q12

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alias   y16x16_el,  q12_l

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alias   y16x16_eh,  q12_h

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alias   y16x16_o,   q13

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alias   y16x16_ol,  q13_l

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alias   y16x16_oh,  q13_h

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alias   y8x16,  y16x16_e

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.macro init     src

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    // load s32x3x3, narrow to s16x3x3

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    vld3.i32    {q13_l, q14_l, q15_l},          [\src]!

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    vld3.i32    {q13_h[0], q14_h[0], q15_h[0]}, [\src]

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    vmovn.i32   CO_R, q13

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    vmovn.i32   CO_G, q14

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    vmovn.i32   CO_B, q15

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    vmov.u8     BIAS_Y, #16

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    vmov.u8     BIAS_U, #128

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.endm

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.macro compute_y_16x1_step  action, s8x16, coeff

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    vmov.u8     n16x16_o,   #0

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    vtrn.u8     \s8x16,     n16x16_o

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    \action     y32x16_el,  \s8x16\()_l,    \coeff

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    \action     y32x16_eh,  \s8x16\()_h,    \coeff

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    \action     y32x16_ol,  n16x16_ol,      \coeff

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    \action     y32x16_oh,  n16x16_oh,      \coeff

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.endm

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/*

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 * in:      r8x16, g8x16, b8x16

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 * out:     y8x16

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 * clobber: q11-q15, r8x16, g8x16, b8x16

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 */

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.macro compute_y_16x1

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    compute_y_16x1_step vmull, r8x16, CO_RY

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    compute_y_16x1_step vmlal, g8x16, CO_GY

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    compute_y_16x1_step vmlal, b8x16, CO_BY

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    vrshrn.i32  y16x16_el,  y32x16_el,  #15

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    vrshrn.i32  y16x16_eh,  y32x16_eh,  #15

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    vrshrn.i32  y16x16_ol,  y32x16_ol,  #15

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    vrshrn.i32  y16x16_oh,  y32x16_oh,  #15

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    vtrn.8      y16x16_e,   y16x16_o

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    vadd.u8     y8x16,      y8x16,      BIAS_Y

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.endm

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alias   c32x8_l,    q14

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alias   c32x8_h,    q15

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alias_qw    c16x8,  q13

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alias_qw    c8x8x2, q10

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.macro compute_chroma_8x1_step  action, s16x8, coeff

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    \action     c32x8_l,    \s16x8\()_l,    \coeff

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    \action     c32x8_h,    \s16x8\()_h,    \coeff

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.endm

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/*

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 * in:      r16x8, g16x8, b16x8

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 * out:     c8x8

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 * clobber: q14-q15

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 */

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.macro compute_chroma_8x1   c, C

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    compute_chroma_8x1_step vmull, r16x8, CO_R\C

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    compute_chroma_8x1_step vmlal, g16x8, CO_G\C

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    compute_chroma_8x1_step vmlal, b16x8, CO_B\C

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    vrshrn.i32  c16x8_l,    c32x8_l,    #15

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    vrshrn.i32  c16x8_h,    c32x8_h,    #15

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    vmovn.i16   \c\()8x8,   c16x8

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    vadd.u8     \c\()8x8,   \c\()8x8,   BIAS_\C

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.endm

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    loop_420sp  rgbx, nv12, init, kernel_420_16x2, 32

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