/****************************************************************************** * * 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_chroma_intra_pred_filters.c * * @brief * Contains function definitions for chroma intra prediction filters * * @author * Ittiam * * @par List of Functions: * -ih264_intra_pred_chroma_8x8_mode_dc * -ih264_intra_pred_chroma_8x8_mode_horz * -ih264_intra_pred_chroma_8x8_mode_vert * -ih264_intra_pred_chroma_8x8_mode_plane * * @remarks * None * ******************************************************************************* */ /*****************************************************************************/ /* File Includes */ /*****************************************************************************/ /* System include files */ #include #include #include /* User include files */ #include "ih264_defs.h" #include "ih264_typedefs.h" #include "ih264_macros.h" #include "ih264_platform_macros.h" #include "ih264_intra_pred_filters.h" /* Global variables used only in assembly files*/ const WORD8 ih264_gai1_intrapred_chroma_plane_coeffs1[] = { 0x01,0x00,0x01,0x00, 0x02,0x00,0x02,0x00, 0x03,0x00,0x03,0x00, 0x04,0x00,0x04,0x00 }; const WORD8 ih264_gai1_intrapred_chroma_plane_coeffs2[] = { 0xfd,0xff,0xfe,0xff, 0xff,0xff,0x00,0x00, 0x01,0x00,0x02,0x00, 0x03,0x00,0x04,0x00, }; /*****************************************************************************/ /* Chroma Intra prediction 8x8 filters */ /*****************************************************************************/ /** ******************************************************************************* * * ih264_intra_pred_chroma_8x8_mode_dc * * @brief * Perform Intra prediction for chroma_8x8 mode:DC * * @par Description: * Perform Intra prediction for chroma_8x8 mode:DC ,described in sec 8.3.4.1 * * @param[in] pu1_src * UWORD8 pointer to the source containing alternate U and V samples * * @param[out] pu1_dst * UWORD8 pointer to the destination with alternate U and V samples * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * ** @param[in] ngbr_avail * availability of neighbouring pixels * * @returns * * @remarks * None * ****************************************************************************** */ void ih264_intra_pred_chroma_8x8_mode_dc(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD32 ngbr_avail) { WORD32 left_avail, left_avail1, left_avail2; /* availability of left predictors (only for DC) */ WORD32 top_avail; /* availability of top predictors (only for DC) */ UWORD8 *pu1_left = NULL; /* Pointer to start of left predictors */ UWORD8 *pu1_top = NULL; /* Pointer to start of top predictors */ /* temporary variables to store accumulated first left half,second left half, * first top half,second top half of U and V values*/ WORD32 val_u_l1 = 0, val_u_l2 = 0, val_u_t1 = 0, val_u_t2 = 0; WORD32 val_v_l1 = 0, val_v_l2 = 0, val_v_t1 = 0, val_v_t2 = 0; WORD32 val_u1 = 0, val_u2 = 0, val_v1 = 0, val_v2 = 0; WORD32 col, row; /*loop variables*/ UNUSED(src_strd); left_avail = ngbr_avail & 0x11; left_avail1 = ngbr_avail & 1; left_avail2 = (ngbr_avail >> 4) & 1; top_avail = (ngbr_avail >> 2) & 1; pu1_top = pu1_src + 2 * BLK8x8SIZE + 2; pu1_left = pu1_src + 2 * BLK8x8SIZE - 2; if(left_avail1) { /* First 4x4 block*/ val_u_l1 += *pu1_left; val_v_l1 += *(pu1_left + 1); pu1_left -= 2; val_u_l1 += *pu1_left; val_v_l1 += *(pu1_left + 1); pu1_left -= 2; val_u_l1 += *pu1_left; val_v_l1 += *(pu1_left + 1); pu1_left -= 2; val_u_l1 += *pu1_left + 2; val_v_l1 += *(pu1_left + 1) + 2; pu1_left -= 2; } else pu1_left -= 2 * 4; if(left_avail2) { /* Second 4x4 block*/ val_u_l2 += *pu1_left; val_v_l2 += *(pu1_left + 1); pu1_left -= 2; val_u_l2 += *pu1_left; val_v_l2 += *(pu1_left + 1); pu1_left -= 2; val_u_l2 += *pu1_left; val_v_l2 += *(pu1_left + 1); pu1_left -= 2; val_u_l2 += *pu1_left + 2; val_v_l2 += *(pu1_left + 1) + 2; pu1_left -= 2; } else pu1_left -= 2 * 4; if(top_avail) { val_u_t1 += *pu1_top + *(pu1_top + 2) + *(pu1_top + 4) + *(pu1_top + 6) + 2; val_u_t2 += *(pu1_top + 8) + *(pu1_top + 10) + *(pu1_top + 12) + *(pu1_top + 14) + 2; val_v_t1 += *(pu1_top + 1) + *(pu1_top + 3) + *(pu1_top + 5) + *(pu1_top + 7) + 2; val_v_t2 += *(pu1_top + 9) + *(pu1_top + 11) + *(pu1_top + 13) + *(pu1_top + 15) + 2; } if(left_avail + top_avail) { val_u1 = (left_avail1 + top_avail) ? ((val_u_l1 + val_u_t1) >> (1 + left_avail1 + top_avail)) :128; val_v1 = (left_avail1 + top_avail) ? ((val_v_l1 + val_v_t1) >> (1 + left_avail1 + top_avail)) :128; if(top_avail) { val_u2 = val_u_t2 >> 2; val_v2 = val_v_t2 >> 2; } else if(left_avail1) { val_u2 = val_u_l1 >> 2; val_v2 = val_v_l1 >> 2; } else { val_u2 = val_v2 = 128; } for(row = 0; row < 4; row++) { /*top left 4x4 block*/ for(col = 0; col < 8; col += 2) { *(pu1_dst + row * dst_strd + col) = val_u1; *(pu1_dst + row * dst_strd + col + 1) = val_v1; } /*top right 4x4 block*/ for(col = 8; col < 16; col += 2) { *(pu1_dst + row * dst_strd + col) = val_u2; *(pu1_dst + row * dst_strd + col + 1) = val_v2; } } if(left_avail2) { val_u1 = val_u_l2 >> 2; val_v1 = val_v_l2 >> 2; } else if(top_avail) { val_u1 = val_u_t1 >> 2; val_v1 = val_v_t1 >> 2; } else { val_u1 = val_v1 = 128; } val_u2 = (left_avail2 + top_avail) ? ((val_u_l2 + val_u_t2) >> (1 + left_avail2 + top_avail)) : 128; val_v2 = (left_avail2 + top_avail) ? ((val_v_l2 + val_v_t2) >> (1 + left_avail2 + top_avail)) : 128; for(row = 4; row < 8; row++) { /*bottom left 4x4 block*/ for(col = 0; col < 8; col += 2) { *(pu1_dst + row * dst_strd + col) = val_u1; *(pu1_dst + row * dst_strd + col + 1) = val_v1; } /*bottom right 4x4 block*/ for(col = 8; col < 16; col += 2) { *(pu1_dst + row * dst_strd + col) = val_u2; *(pu1_dst + row * dst_strd + col + 1) = val_v2; } } } else { /* Both left and top are unavailable, set the block to 128 */ for(row = 0; row < 8; row++) { memset(pu1_dst + row * dst_strd, 128, 8 * sizeof(UWORD16)); } } } /** ******************************************************************************* * *ih264_intra_pred_chroma_8x8_mode_horz * * @brief * Perform Intra prediction for chroma_8x8 mode:Horizontal * * @par Description: * Perform Intra prediction for chroma_8x8 mode:Horizontal ,described in sec 8.3.4.2 * * @param[in] pu1_src * UWORD8 pointer to the source containing alternate U and V samples * * @param[out] pu1_dst * UWORD8 pointer to the destination with alternate U and V samples * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] ngbr_avail * availability of neighbouring pixels(Not used in this function) * * @returns * * @remarks * None * ****************************************************************************** */ void ih264_intra_pred_chroma_8x8_mode_horz(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD32 ngbr_avail) { UWORD8 *pu1_left = NULL; /* Pointer to start of top predictors */ WORD32 rows, cols; /* loop variables*/ UNUSED(src_strd); UNUSED(ngbr_avail); pu1_left = pu1_src + 2 * BLK8x8SIZE - 2; for(rows = 0; rows < 8; rows++) { for(cols = 0; cols < 16; cols += 2) { *(pu1_dst + rows * dst_strd + cols) = *pu1_left; *(pu1_dst + rows * dst_strd + cols + 1) = *(pu1_left + 1); } pu1_left -= 2; } } /** ******************************************************************************* * *ih264_intra_pred_chroma_8x8_mode_vert * * @brief * Perform Intra prediction for chroma_8x8 mode:vertical * * @par Description: * Perform Intra prediction for chroma_8x8 mode:vertical ,described in sec 8.3.4.3 * * @param[in] pu1_src * UWORD8 pointer to the source containing alternate U and V samples * * @param[out] pu1_dst * UWORD8 pointer to the destination with alternate U and V samples * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] ngbr_avail * availability of neighbouring pixels(Not used in this function) * * @returns * * @remarks * None * ******************************************************************************* */ void ih264_intra_pred_chroma_8x8_mode_vert(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD32 ngbr_avail) { UWORD8 *pu1_top = NULL; /* Pointer to start of top predictors */ WORD32 row;/*loop variable*/ UNUSED(src_strd); UNUSED(ngbr_avail); pu1_top = pu1_src + 2 * BLK8x8SIZE + 2; /* 8 bytes are copied from src to dst */ for(row = 0; row < 2; row++) { memcpy(pu1_dst, pu1_top, 16); pu1_dst += dst_strd; memcpy(pu1_dst, pu1_top, 16); pu1_dst += dst_strd; memcpy(pu1_dst, pu1_top, 16); pu1_dst += dst_strd; memcpy(pu1_dst, pu1_top, 16); pu1_dst += dst_strd; } } /** ******************************************************************************* * * ih264_intra_pred_chroma_8x8_mode_plane * * @brief * Perform Intra prediction for chroma_8x8 mode:PLANE * * @par Description: * Perform Intra prediction for chroma_8x8 mode:PLANE ,described in sec 8.3.4.4 * * @param[in] pu1_src * UWORD8 pointer to the source containing alternate U and V samples * * @param[out] pu1_dst * UWORD8 pointer to the destination with alternate U and V samples * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] ngbr_avail * availability of neighbouring pixels(Not used in this function) * * @returns * * @remarks * None * ****************************************************************************** */ void ih264_intra_pred_chroma_8x8_mode_plane(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD32 ngbr_avail) { UWORD8 *pu1_left = NULL; /* Pointer to start of left predictors */ UWORD8 *pu1_top = NULL; /* Pointer to start of top predictors */ WORD32 val = 0; WORD32 rows, cols; /* loop variables*/ WORD32 a_u, b_u, c_u, h_u, v_u; /* Implementing section 8.3.4.4 . The variables represent the corresponding variables in the section*/ WORD32 a_v, b_v, c_v, h_v, v_v; UNUSED(src_strd); UNUSED(ngbr_avail); a_u = b_u = c_u = h_u = v_u = 0; a_v = b_v = c_v = h_v = v_v = 0; /* As chroma format 4:2:0 is used,xCF = 4 * ( chroma_format_idc = = 3 ) = 0 and yCF = 4 * ( chroma_format_idc != 1 ) = 0 */ pu1_top = pu1_src + 2 * BLK8x8SIZE + 2; pu1_left = pu1_src + 2 * BLK8x8SIZE - 2; /* Implementing section 8.3.4.4 */ for(cols = 0; cols < 4; cols++) { h_u += (cols + 1) * (pu1_top[8 + 2 * cols] - pu1_top[4 - 2 * cols]);/*section 8.3.4.4 equation (8-144)*/ h_v += (cols + 1) * (pu1_top[8 + 2 * cols + 1] - pu1_top[4 - 2 * cols+ 1]); v_u += (cols + 1) * (pu1_left[(4 + cols) * (-2)] - pu1_left[(2 - cols) * (-2)]); v_v += (cols + 1) * (pu1_left[(4 + cols) * (-2) + 1] - pu1_left[(2 - cols) * (-2) + 1]);/*section 8.3.4.4 equation (8-145)*/ } a_u = 16 * (pu1_left[7 * (-2)] + pu1_top[14]); a_v = 16 * (pu1_left[7 * (-2) + 1] + pu1_top[15]);/*section 8.3.3.4 equation (8-141)*/ b_u = (34 * h_u + 32) >> 6;/*section 8.3.3.4 equation (8-142)*/ b_v = (34 * h_v + 32) >> 6;/*section 8.3.3.4 equation (8-142)*/ c_u = (34 * v_u + 32) >> 6;/*section 8.3.3.4 equation (8-143)*/ c_v = (34 * v_v + 32) >> 6;/*section 8.3.3.4 equation (8-143)*/ for(rows = 0; rows < 8; rows++) { for(cols = 0; cols < 8; cols++) { val = (a_u + b_u * (cols - 3) + c_u * (rows - 3) );/*section 8.3.4.4 equation (8-140)*/ val = (val + 16) >> 5; *(pu1_dst + rows * dst_strd + 2 * cols) = CLIP_U8(val); val = (a_v + b_v * (cols - 3) + c_v * (rows - 3) );/*section 8.3.4.4 equation (8-140)*/ val = (val + 16) >> 5; *(pu1_dst + rows * dst_strd + 2 * cols + 1) = CLIP_U8(val); } } }