| /****************************************************************************** |
| * |
| * Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore |
| * |
| * 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. |
| * |
| ******************************************************************************/ |
| /** |
| ******************************************************************************* |
| * @file |
| * ihevc_chroma_iquant_itrans_recon.c |
| * |
| * @brief |
| * Contains function definitions for inverse quantization, inverse |
| * transform and reconstruction of chroma interleaved data. |
| * |
| * @author |
| * 100470 |
| * |
| * @par List of Functions: |
| * - ihevc_chroma_iquant_itrans_recon_4x4() |
| * |
| * @remarks |
| * None |
| * |
| ******************************************************************************* |
| */ |
| #include <stdio.h> |
| #include <string.h> |
| #include "ihevc_typedefs.h" |
| #include "ihevc_macros.h" |
| #include "ihevc_platform_macros.h" |
| #include "ihevc_defs.h" |
| #include "ihevc_trans_tables.h" |
| #include "ihevc_chroma_iquant_itrans_recon.h" |
| #include "ihevc_func_selector.h" |
| #include "ihevc_trans_macros.h" |
| |
| /* All the functions work one component(U or V) of interleaved data depending upon pointers passed to it */ |
| /* Data visualization */ |
| /* U V U V U V U V */ |
| /* U V U V U V U V */ |
| /* U V U V U V U V */ |
| /* U V U V U V U V */ |
| /* If the pointer points to first byte of above stream (U) , functions will operate on U component */ |
| /* If the pointer points to second byte of above stream (V) , functions will operate on V component */ |
| |
| |
| /** |
| ******************************************************************************* |
| * |
| * @brief |
| * This function performs inverse quantization, inverse transform and |
| * reconstruction for 4x4 input block |
| * |
| * @par Description: |
| * Performs inverse quantization , inverse transform and adds the |
| * prediction data and clips output to 8 bit |
| * |
| * @param[in] pi2_src |
| * Input 4x4 coefficients |
| * |
| * @param[in] pi2_tmp |
| * Temporary 4x4 buffer for storing inverse transform |
| * 1st stage output |
| * |
| * @param[in] pu1_pred |
| * Prediction 4x4 block |
| * |
| * @param[in] pi2_dequant_coeff |
| * Dequant Coeffs |
| * |
| * @param[out] pu1_dst |
| * Output 4x4 block |
| * |
| * @param[in] qp_div |
| * Quantization parameter / 6 |
| * |
| * @param[in] qp_rem |
| * Quantization parameter % 6 |
| * |
| * @param[in] src_strd |
| * Input stride |
| * |
| * @param[in] pred_strd |
| * Prediction stride |
| * |
| * @param[in] dst_strd |
| * Output Stride |
| * |
| * @param[in] zero_cols |
| * Zero columns in pi2_src |
| * |
| * @param[in] zero_rows |
| * Zero Rows in pi2_src |
| * |
| * @returns Void |
| * |
| * @remarks |
| * None |
| * |
| ******************************************************************************* |
| */ |
| |
| |
| void ihevc_chroma_iquant_itrans_recon_4x4(WORD16 *pi2_src, |
| WORD16 *pi2_tmp, |
| UWORD8 *pu1_pred, |
| WORD16 *pi2_dequant_coeff, |
| UWORD8 *pu1_dst, |
| WORD32 qp_div, /* qpscaled / 6 */ |
| WORD32 qp_rem, /* qpscaled % 6 */ |
| WORD32 src_strd, |
| WORD32 pred_strd, |
| WORD32 dst_strd, |
| WORD32 zero_cols, |
| WORD32 zero_rows) |
| { |
| UNUSED(zero_rows); |
| |
| /* Inverse Transform */ |
| { |
| WORD32 j; |
| WORD32 e[2], o[2]; |
| WORD32 add; |
| WORD32 shift; |
| WORD16 *pi2_tmp_orig; |
| WORD32 shift_iq; |
| WORD32 trans_size; |
| /* Inverse Quantization constants */ |
| { |
| WORD32 log2_trans_size, bit_depth; |
| |
| log2_trans_size = 2; |
| bit_depth = 8 + 0; |
| shift_iq = bit_depth + log2_trans_size - 5; |
| } |
| |
| trans_size = TRANS_SIZE_4; |
| pi2_tmp_orig = pi2_tmp; |
| |
| /* Inverse Transform 1st stage */ |
| shift = IT_SHIFT_STAGE_1; |
| add = 1 << (shift - 1); |
| |
| for(j = 0; j < trans_size; j++) |
| { |
| /* Checking for Zero Cols */ |
| if((zero_cols & 1) == 1) |
| { |
| memset(pi2_tmp, 0, trans_size * sizeof(WORD16)); |
| } |
| else |
| { |
| WORD32 iq_tmp_1, iq_tmp_2; |
| /* Utilizing symmetry properties to the maximum to minimize the number of multiplications */ |
| IQUANT_4x4(iq_tmp_1, |
| pi2_src[1 * src_strd], |
| pi2_dequant_coeff[1 * trans_size] * g_ihevc_iquant_scales[qp_rem], |
| shift_iq, qp_div); |
| IQUANT_4x4(iq_tmp_2, |
| pi2_src[3 * src_strd], |
| pi2_dequant_coeff[3 * trans_size] * g_ihevc_iquant_scales[qp_rem], |
| shift_iq, qp_div); |
| |
| o[0] = g_ai2_ihevc_trans_4[1][0] * iq_tmp_1 |
| + g_ai2_ihevc_trans_4[3][0] * iq_tmp_2; |
| o[1] = g_ai2_ihevc_trans_4[1][1] * iq_tmp_1 |
| + g_ai2_ihevc_trans_4[3][1] * iq_tmp_2; |
| |
| IQUANT_4x4(iq_tmp_1, |
| pi2_src[0 * src_strd], |
| pi2_dequant_coeff[0 * trans_size] * g_ihevc_iquant_scales[qp_rem], |
| shift_iq, qp_div); |
| IQUANT_4x4(iq_tmp_2, |
| pi2_src[2 * src_strd], |
| pi2_dequant_coeff[2 * trans_size] * g_ihevc_iquant_scales[qp_rem], |
| shift_iq, qp_div); |
| |
| e[0] = g_ai2_ihevc_trans_4[0][0] * iq_tmp_1 |
| + g_ai2_ihevc_trans_4[2][0] * iq_tmp_2; |
| e[1] = g_ai2_ihevc_trans_4[0][1] * iq_tmp_1 |
| + g_ai2_ihevc_trans_4[2][1] * iq_tmp_2; |
| |
| pi2_tmp[0] = |
| CLIP_S16(((e[0] + o[0] + add) >> shift)); |
| pi2_tmp[1] = |
| CLIP_S16(((e[1] + o[1] + add) >> shift)); |
| pi2_tmp[2] = |
| CLIP_S16(((e[1] - o[1] + add) >> shift)); |
| pi2_tmp[3] = |
| CLIP_S16(((e[0] - o[0] + add) >> shift)); |
| } |
| pi2_src++; |
| pi2_dequant_coeff++; |
| pi2_tmp += trans_size; |
| zero_cols = zero_cols >> 1; |
| } |
| |
| pi2_tmp = pi2_tmp_orig; |
| |
| /* Inverse Transform 2nd stage */ |
| shift = IT_SHIFT_STAGE_2; |
| add = 1 << (shift - 1); |
| |
| for(j = 0; j < trans_size; j++) |
| { |
| WORD32 itrans_out; |
| |
| /* Utilizing symmetry properties to the maximum to minimize the number of multiplications */ |
| o[0] = g_ai2_ihevc_trans_4[1][0] * pi2_tmp[trans_size] |
| + g_ai2_ihevc_trans_4[3][0] |
| * pi2_tmp[3 * trans_size]; |
| o[1] = g_ai2_ihevc_trans_4[1][1] * pi2_tmp[trans_size] |
| + g_ai2_ihevc_trans_4[3][1] |
| * pi2_tmp[3 * trans_size]; |
| e[0] = g_ai2_ihevc_trans_4[0][0] * pi2_tmp[0] |
| + g_ai2_ihevc_trans_4[2][0] |
| * pi2_tmp[2 * trans_size]; |
| e[1] = g_ai2_ihevc_trans_4[0][1] * pi2_tmp[0] |
| + g_ai2_ihevc_trans_4[2][1] |
| * pi2_tmp[2 * trans_size]; |
| |
| itrans_out = |
| CLIP_S16(((e[0] + o[0] + add) >> shift)); |
| pu1_dst[0 * 2] = CLIP_U8((itrans_out + pu1_pred[0 * 2])); |
| |
| itrans_out = |
| CLIP_S16(((e[1] + o[1] + add) >> shift)); |
| pu1_dst[1 * 2] = CLIP_U8((itrans_out + pu1_pred[1 * 2])); |
| |
| itrans_out = |
| CLIP_S16(((e[1] - o[1] + add) >> shift)); |
| pu1_dst[2 * 2] = CLIP_U8((itrans_out + pu1_pred[2 * 2])); |
| |
| itrans_out = |
| CLIP_S16(((e[0] - o[0] + add) >> shift)); |
| pu1_dst[3 * 2] = CLIP_U8((itrans_out + pu1_pred[3 * 2])); |
| |
| pi2_tmp++; |
| pu1_pred += pred_strd; |
| pu1_dst += dst_strd; |
| |
| } |
| } |
| } |
