| /****************************************************************************** |
| * |
| * 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 <stdio.h> |
| #include <stddef.h> |
| #include <string.h> |
| |
| /* User Include Files */ |
| #include "ih264_typedefs.h" |
| #include "ih264_macros.h" |
| #include "ih264_defs.h" |
| #include "ih264_intra_pred_filters.h" |
| #include "ih264_platform_macros.h" |
| |
| /*****************************************************************************/ |
| /* Global definitions */ |
| /*****************************************************************************/ |
| /* Note: 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, |
| }; |
| |
| /*****************************************************************************/ |
| /* Function Definitions */ |
| /*****************************************************************************/ |
| |
| /** |
| ******************************************************************************* |
| * |
| * @brief Perform chroma_8x8 intra DC prediction |
| * |
| * @par Description |
| * Perform chroma_8x8 intra DC prediction (refer sec 8.3.4.1 of ITU T.h264) |
| * |
| * @param[in] pu1_src |
| * pointer to the source containing alternate U and V samples |
| * |
| * @param[out] pu1_dst |
| * pointer to the destination with alternate U and V samples |
| * |
| * @param[in] src_strd |
| * source stride |
| * |
| * @param[in] dst_strd |
| * destination stride |
| * |
| * @param[in] ngbr_avail |
| * availability of neighbouring pixels |
| * |
| * @returns none |
| * |
| * @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) |
| { |
| /* availability of left predictors (only for DC) */ |
| WORD32 left_avail, left_avail1, left_avail2; |
| |
| /* availability of top predictors (only for DC) */ |
| WORD32 top_avail; |
| |
| /* Pointer to start of left predictors */ |
| UWORD8 *pu1_left = NULL; |
| |
| /* Pointer to start of top predictors */ |
| UWORD8 *pu1_top = NULL; |
| |
| /* 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; |
| |
| /* temp */ |
| WORD32 col, row; |
| |
| 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)); |
| } |
| } |
| } |
| |
| /** |
| ******************************************************************************* |
| * |
| * @brief Perform chroma_8x8 intra Horz prediction |
| * |
| * @par Description |
| * Perform chroma_8x8 intra Horz prediction (refer sec 8.3.4.2 of ITU T.h264) |
| * |
| * @param[in] pu1_src |
| * pointer to the source containing alternate U and V samples |
| * |
| * @param[out] pu1_dst |
| * pointer to the destination with alternate U and V samples |
| * |
| * @param[in] src_strd |
| * source stride |
| * |
| * @param[in] dst_strd |
| * 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) |
| { |
| /* Pointer to start of left predictors */ |
| UWORD8 *pu1_left = NULL; |
| |
| /* temp */ |
| WORD32 rows, cols; |
| |
| 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; |
| } |
| } |
| |
| /** |
| ******************************************************************************* |
| * |
| * @brief Perform chroma_8x8 intra Vert prediction |
| * |
| * @par Description |
| * Perform chroma_8x8 intra Vert prediction (refer sec 8.3.4.3 of ITU T.h264) |
| * |
| * @param[in] pu1_src |
| * pointer to the source containing alternate U and V samples |
| * |
| * @param[out] pu1_dst |
| * pointer to the destination with alternate U and V samples |
| * |
| * @param[in] src_strd |
| * source stride |
| * |
| * @param[in] dst_strd |
| * 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) |
| { |
| /* Pointer to start of top predictors */ |
| UWORD8 *pu1_top = NULL; |
| |
| /* temp */ |
| WORD32 row; |
| |
| 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; |
| } |
| } |
| |
| /** |
| ******************************************************************************* |
| * |
| * @brief Perform chroma_8x8 intra Plane prediction |
| * |
| * @par Description |
| * Perform chroma_8x8 intra Plane prediction (refer sec 8.3.4.4 of ITU T.h264) |
| * |
| * @param[in] pu1_src |
| * pointer to the source containing alternate U and V samples |
| * |
| * @param[out] pu1_dst |
| * pointer to the destination with alternate U and V samples |
| * |
| * @param[in] src_strd |
| * source stride |
| * |
| * @param[in] dst_strd |
| * 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) |
| { |
| /* Pointer to start of left predictors */ |
| UWORD8 *pu1_left = NULL; |
| |
| /* Pointer to start of top predictors */ |
| UWORD8 *pu1_top = NULL; |
| |
| /* temp */ |
| WORD32 val = 0; |
| WORD32 rows, cols; |
| |
| /* Implementing section 8.3.4.4. The variables represent the corresponding |
| * variables in the section */ |
| WORD32 a_u, b_u, c_u, h_u, v_u; |
| 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; |
| |
| pu1_top = pu1_src + 2 * BLK8x8SIZE + 2; |
| pu1_left = pu1_src + 2 * BLK8x8SIZE - 2; |
| |
| for(cols = 0; cols < 4; cols++) |
| { |
| h_u += (cols + 1) * (pu1_top[8 + 2 * cols] - pu1_top[4 - 2 * cols]); |
| 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]); |
| } |
| a_u = 16 * (pu1_left[7 * (-2)] + pu1_top[14]); |
| a_v = 16 * (pu1_left[7 * (-2) + 1] + pu1_top[15]); |
| b_u = (34 * h_u + 32) >> 6; |
| b_v = (34 * h_v + 32) >> 6; |
| c_u = (34 * v_u + 32) >> 6; |
| c_v = (34 * v_v + 32) >> 6; |
| |
| for(rows = 0; rows < 8; rows++) |
| { |
| for(cols = 0; cols < 8; cols++) |
| { |
| val = (a_u + b_u * (cols - 3) + c_u * (rows - 3) ); |
| 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) ); |
| val = (val + 16) >> 5; |
| *(pu1_dst + rows * dst_strd + 2 * cols + 1) = CLIP_U8(val); |
| } |
| } |
| } |
| |
