@/****************************************************************************** @ * @ * Copyright (C) 2015 The Android Open Source Project @ * @ * Licensed under the Apache License, Version 2.0 (the "License"); @ * you may not use this file except in compliance with the License. @ * You may obtain a copy of the License at: @ * @ * http://www.apache.org/licenses/LICENSE-2.0 @ * @ * Unless required by applicable law or agreed to in writing, software @ * distributed under the License is distributed on an "AS IS" BASIS, @ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. @ * See the License for the specific language governing permissions and @ * limitations under the License. @ * @ ***************************************************************************** @ * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore @*/ @** @ ******************************************************************************* @ * @file @ * ih264_ihadamard_scaling_a9.s @ * @ * @brief @ * Contains function definitions for inverse hadamard transform on 4x4 DC outputs @ * of 16x16 intra-prediction @ * @ * @author @ * Mohit @ * @ * @par List of Functions: @ * - ih264_ihadamard_scaling_4x4_a9() @ * - ih264_ihadamard_scaling_2x2_uv_a9() @ * @ * @remarks @ * None @ * @ ******************************************************************************* @ * @ * @brief This function performs a 4x4 inverse hadamard transform on the 4x4 DC coefficients @ * of a 16x16 intra prediction macroblock, and then performs scaling. @ * prediction buffer @ * @ * @par Description: @ * The DC coefficients pass through a 2-stage inverse hadamard transform. @ * This inverse transformed content is scaled to based on Qp value. @ * @ * @param[in] pi2_src @ * input 4x4 block of DC coefficients @ * @ * @param[out] pi2_out @ * output 4x4 block @ * @ * @param[in] pu2_iscal_mat @ * pointer to scaling list @ * @ * @param[in] pu2_weigh_mat @ * pointer to weight matrix @ * @ * @param[in] u4_qp_div_6 @ * Floor (qp/6) @ * @ * @param[in] pi4_tmp @ * temporary buffer of size 1*16 @ * @ * @returns none @ * @ * @remarks none @ * @ ******************************************************************************* @ * @ * @ ******************************************************************************* @ * @ void ih264_ihadamard_scaling_4x4(WORD16* pi2_src, @ WORD16* pi2_out, @ const UWORD16 *pu2_iscal_mat, @ const UWORD16 *pu2_weigh_mat, @ UWORD32 u4_qp_div_6, @ WORD32* pi4_tmp) @**************Variables Vs Registers***************************************** @r0 => *pi2_src @r1 => *pi2_out @r2 => *pu2_iscal_mat @r3 => *pu2_weigh_mat @r4 => u4_qp_div_6 .text .p2align 2 .global ih264_ihadamard_scaling_4x4_a9 ih264_ihadamard_scaling_4x4_a9: @VLD4.S16 is used because the pointer is incremented by SUB_BLK_WIDTH_4x4 @If the macro value changes need to change the instruction according to it. @Only one shift is done in horizontal inverse because, @if u4_qp_div_6 is lesser than 4 then shift value will be neagative and do negative left shift, in this case rnd_factor has value @if u4_qp_div_6 is greater than 4 then shift value will be positive and do left shift, here rnd_factor is 0 stmfd sp!, {r4-r12, r14} @ stack stores the values of the arguments ldr r4, [sp, #40] @ Loads u4_qp_div_6 vdup.s32 q10, r4 @ Populate the u4_qp_div_6 in Q10 ldrh r6, [r3] @ load pu2_weight_mat[0] , H for unsigned halfword load ldrh r7, [r2] @ load pu2_iscal_mat[0] , H for unsigned halfword load mul r6, r6, r7 @ pu2_iscal_mat[0]*pu2_weigh_mat[0] vdup.s32 q9, r6 @ Populate pu2_iscal_mat[0]*pu2_weigh_mat[0] 32-bit in Q9 vpush {d8-d15} @=======================INVERSE HADAMARD TRANSFORM================================ vld4.s16 {d0, d1, d2, d3}, [r0] @load x4,x5,x6,x7 vaddl.s16 q12, d0, d3 @x0 = x4 + x7 vaddl.s16 q13, d1, d2 @x1 = x5 + x6 vsubl.s16 q14, d1, d2 @x2 = x5 - x6 vsubl.s16 q15, d0, d3 @x3 = x4 - x7 vadd.s32 q2, q12, q13 @pi4_tmp_ptr[0] = x0 + x1 vadd.s32 q3, q15, q14 @pi4_tmp_ptr[1] = x3 + x2 vsub.s32 q4, q12, q13 @pi4_tmp_ptr[2] = x0 - x1 vsub.s32 q5, q15, q14 @pi4_tmp_ptr[3] = x3 - x2 vtrn.32 q2, q3 @Transpose the register for vertical transform vtrn.32 q4, q5 vswp d5, d8 @Q2 = x4, Q4 = x6 vswp d7, d10 @Q3 = x5, Q5 = x7 vadd.s32 q12, q2, q5 @x0 = x4+x7 vadd.s32 q13, q3, q4 @x1 = x5+x6 vsub.s32 q14, q3, q4 @x2 = x5-x6 vsub.s32 q15, q2, q5 @x3 = x4-x7 vadd.s32 q0, q12, q13 @pi4_tmp_ptr[0] = x0 + x1 vadd.s32 q1, q15, q14 @pi4_tmp_ptr[1] = x3 + x2 vsub.s32 q2, q12, q13 @pi4_tmp_ptr[2] = x0 - x1 vsub.s32 q3, q15, q14 @pi4_tmp_ptr[3] = x3 - x2 vmul.s32 q0, q0, q9 @ Q0 = p[i] = (x[i] * trns_coeff[i]) where i = 0..3 vmul.s32 q1, q1, q9 @ Q1 = p[i] = (x[i] * trns_coeff[i]) where i = 4..7 vmul.s32 q2, q2, q9 @ Q2 = p[i] = (x[i] * trns_coeff[i]) where i = 8..11 vmul.s32 q3, q3, q9 @ Q3 = p[i] = (x[i] * trns_coeff[i]) where i = 12..15 vshl.s32 q0, q0, q10 @ Q0 = q[i] = (p[i] << (qP/6)) where i = 0..3 vshl.s32 q1, q1, q10 @ Q1 = q[i] = (p[i] << (qP/6)) where i = 4..7 vshl.s32 q2, q2, q10 @ Q2 = q[i] = (p[i] << (qP/6)) where i = 8..11 vshl.s32 q3, q3, q10 @ Q3 = q[i] = (p[i] << (qP/6)) where i = 12..15 vqrshrn.s32 d0, q0, #0x6 @ D0 = c[i] = ((q[i] + 32) >> 4) where i = 0..3 vqrshrn.s32 d1, q1, #0x6 @ D1 = c[i] = ((q[i] + 32) >> 4) where i = 4..7 vqrshrn.s32 d2, q2, #0x6 @ D2 = c[i] = ((q[i] + 32) >> 4) where i = 8..11 vqrshrn.s32 d3, q3, #0x6 @ D3 = c[i] = ((q[i] + 32) >> 4) where i = 12..15 vst1.s16 {d0, d1, d2, d3}, [r1] @IV row store the value vpop {d8-d15} ldmfd sp!, {r4-r12, r15} @Reload the registers from SP @ ******************************************************************************* @ * @ * @brief This function performs a 2x2 inverse hadamard transform for chroma block @ * @ * @par Description: @ * The DC coefficients pass through a 2-stage inverse hadamard transform. @ * This inverse transformed content is scaled to based on Qp value. @ * Both DC blocks of U and v blocks are processesd @ * @ * @param[in] pi2_src @ * input 1x8 block of ceffs. First 4 are from U and next from V @ * @ * @param[out] pi2_out @ * output 1x8 block @ * @ * @param[in] pu2_iscal_mat @ * pointer to scaling list @ * @ * @param[in] pu2_weigh_mat @ * pointer to weight matrix @ * @ * @param[in] u4_qp_div_6 @ * Floor (qp/6) @ * @ * @returns none @ * @ * @remarks none @ * @ ******************************************************************************* @ * @ * @ ******************************************************************************* @ * @ void ih264_ihadamard_scaling_2x2_uv(WORD16* pi2_src, @ WORD16* pi2_out, @ const UWORD16 *pu2_iscal_mat, @ const UWORD16 *pu2_weigh_mat, @ UWORD32 u4_qp_div_6, .global ih264_ihadamard_scaling_2x2_uv_a9 ih264_ihadamard_scaling_2x2_uv_a9: @Registers used @ r0 : *pi2_src @ r1 : *pi2_out @ r2 : *pu2_iscal_mat @ r3 : *pu2_weigh_mat vld1.u16 d26[0], [r2] vld1.u16 d27[0], [r3] vmull.u16 q15, d26, d27 @pu2_iscal_mat[0] * pu2_weigh_mat[0] vdup.u32 q15, d30[0] vld1.u16 d28[0], [sp] @load qp/6 vpush {d8-d15} vmov.u16 d29, #5 vsubl.u16 q14, d28, d29 @qp\6 - 5 vdup.s32 q14, d28[0] vld2.s16 {d0, d1}, [r0] @load 8 dc coeffs @i2_x4,i2_x6,i2_y4,i1_y6 -> d0 @i2_x5,i2_x7,i2_y5,i1_y6 -> d1 vaddl.s16 q1, d0, d1 @ i4_x0 = i4_x4 + i4_x5;...x2 vsubl.s16 q2, d0, d1 @ i4_x1 = i4_x4 - i4_x5;...x3 vtrn.s32 q1, q2 @i4_x0 i4_x1 -> q1 vadd.s32 q3, q1, q2 @i4_x4 = i4_x0+i4_x2;.. i4_x5 vsub.s32 q1, q1, q2 @i4_x6 = i4_x0-i4_x2;.. i4_x7 vmul.s32 q5, q3, q15 vmul.s32 q6, q1, q15 vshl.s32 q7, q5, q14 vshl.s32 q8, q6, q14 vmovn.s32 d18, q7 @i4_x4 i4_x5 i4_y4 i4_y5 vmovn.s32 d19, q8 @i4_x6 i4_x7 i4_y6 i4_y7 vst2.s32 {d18-d19}, [r1] vpop {d8-d15} bx lr