/****************************************************************************** * * 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_inter_pred_filters.c * * @brief * Contains function definitions for inter prediction interpolation filters * * * @author * Srinivas T * * @par List of Functions: * - ihevc_inter_pred_luma_copy() * - ihevc_inter_pred_luma_horz() * - ihevc_inter_pred_luma_vert() * - ihevc_inter_pred_luma_copy_w16out() * - ihevc_inter_pred_luma_horz_w16out() * - ihevc_inter_pred_luma_vert_w16out() * - ihevc_inter_pred_luma_vert_w16inp() * - ihevc_inter_pred_luma_vert_w16inp_w16out() * - ihevc_inter_pred_chroma_copy() * - ihevc_inter_pred_chroma_horz() * - ihevc_inter_pred_chroma_vert() * - ihevc_inter_pred_chroma_copy_w16out() * - ihevc_inter_pred_chroma_horz_w16out() * - ihevc_inter_pred_chroma_vert_w16out() * - ihevc_inter_pred_chroma_vert_w16inp() * - ihevc_inter_pred_chroma_vert_w16inp_w16out() * * @remarks * None * ******************************************************************************* */ /*****************************************************************************/ /* File Includes */ /*****************************************************************************/ #include "ihevc_typedefs.h" #include "ihevc_defs.h" #include "ihevc_macros.h" #include "ihevc_platform_macros.h" #include "ihevc_func_selector.h" #include "ihevc_inter_pred.h" /*****************************************************************************/ /* Function Definitions */ /*****************************************************************************/ /** ******************************************************************************* * * @brief * Interprediction luma function for copy * * @par Description: * Copies the array of width 'wd' and height 'ht' from the location pointed * by 'src' to the location pointed by 'dst' * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pu1_dst * UWORD8 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_luma_copy(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col; UNUSED(pi1_coeff); for(row = 0; row < ht; row++) { for(col = 0; col < wd; col++) { pu1_dst[col] = pu1_src[col]; } pu1_src += src_strd; pu1_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Interprediction luma filter for horizontal input * * @par Description: * Applies a horizontal filter with coefficients pointed to by 'pi1_coeff' * to the elements pointed by 'pu1_src' and writes to the location pointed * by 'pu1_dst' The output is downshifted by 6 and clipped to 8 bits * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pu1_dst * UWORD8 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_luma_horz(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD16 i2_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < wd; col++) { i2_tmp = 0; for(i = 0; i < NTAPS_LUMA; i++) i2_tmp += pi1_coeff[i] * pu1_src[col + (i - 3)]; i2_tmp = (i2_tmp + OFFSET_14_MINUS_BIT_DEPTH) >> SHIFT_14_MINUS_BIT_DEPTH; i2_tmp = CLIP_U8(i2_tmp); pu1_dst[col] = (UWORD8)i2_tmp; } pu1_src += src_strd; pu1_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Interprediction luma filter for vertical input * * @par Description: * Applies a vertcal filter with coefficients pointed to by 'pi1_coeff' to * the elements pointed by 'pu1_src' and writes to the location pointed by * 'pu1_dst' The output is downshifted by 6 and clipped to 8 bits * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pu1_dst * UWORD8 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_luma_vert(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD16 i2_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < wd; col++) { i2_tmp = 0; for(i = 0; i < NTAPS_LUMA; i++) i2_tmp += pi1_coeff[i] * pu1_src[col + (i - 3) * src_strd]; i2_tmp = (i2_tmp + OFFSET_14_MINUS_BIT_DEPTH) >> SHIFT_14_MINUS_BIT_DEPTH; i2_tmp = CLIP_U8(i2_tmp); pu1_dst[col] = (UWORD8)i2_tmp; } pu1_src += src_strd; pu1_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Interprediction luma filter for copy 16bit output * * @par Description: * Copies the array of width 'wd' and height 'ht' from the location pointed * by 'src' to the location pointed by 'dst' The output is upshifted by 6 * bits and is used as input for vertical filtering or weighted prediction * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pi2_dst * WORD16 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_luma_copy_w16out(UWORD8 *pu1_src, WORD16 *pi2_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col; UNUSED(pi1_coeff); for(row = 0; row < ht; row++) { for(col = 0; col < wd; col++) { pi2_dst[col] = (pu1_src[col] << SHIFT_14_MINUS_BIT_DEPTH); } pu1_src += src_strd; pi2_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Interprediction luma filter for horizontal 16bit output * * @par Description: * Applies a horizontal filter with coefficients pointed to by 'pi1_coeff' * to the elements pointed by 'pu1_src' and writes to the location pointed * by 'pu1_dst' No downshifting or clipping is done and the output is used * as an input for vertical filtering or weighted prediction * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pi2_dst * WORD16 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_luma_horz_w16out(UWORD8 *pu1_src, WORD16 *pi2_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD16 i2_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < wd; col++) { i2_tmp = 0; for(i = 0; i < NTAPS_LUMA; i++) i2_tmp += pi1_coeff[i] * pu1_src[col + (i - 3)]; pi2_dst[col] = i2_tmp; } pu1_src += src_strd; pi2_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Interprediction luma filter for vertical 16bit output * * @par Description: * Applies a vertical filter with coefficients pointed to by 'pi1_coeff' to * the elements pointed by 'pu1_src' and writes to the location pointed by * 'pu1_dst' No downshifting or clipping is done and the output is used as * an input for weighted prediction * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pi2_dst * WORD16 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_luma_vert_w16out(UWORD8 *pu1_src, WORD16 *pi2_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD16 i2_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < wd; col++) { i2_tmp = 0; for(i = 0; i < NTAPS_LUMA; i++) i2_tmp += pi1_coeff[i] * pu1_src[col + (i - 3) * src_strd]; pi2_dst[col] = i2_tmp; } pu1_src += src_strd; pi2_dst += dst_strd; } } /** ******************************************************************************* * * @brief * * Luma vertical filter for 16bit input. * * @par Description: * Applies a vertical filter with coefficients pointed to by 'pi1_coeff' to * the elements pointed by 'pu1_src' and writes to the location pointed by * 'pu1_dst' Input is 16 bits The filter output is downshifted by 12 and * clipped to lie between 0 and 255 * * @param[in] pi2_src * WORD16 pointer to the source * * @param[out] pu1_dst * UWORD8 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_luma_vert_w16inp(WORD16 *pi2_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD32 i4_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < wd; col++) { i4_tmp = 0; for(i = 0; i < NTAPS_LUMA; i++) i4_tmp += pi1_coeff[i] * pi2_src[col + (i - 3) * src_strd]; i4_tmp = ((i4_tmp >> SHIFT_14_MINUS_BIT_DEPTH) + OFFSET_14_MINUS_BIT_DEPTH) >> SHIFT_14_MINUS_BIT_DEPTH; i4_tmp = CLIP_U8(i4_tmp); pu1_dst[col] = i4_tmp; } pi2_src += src_strd; pu1_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Luma prediction filter for vertical 16bit input & output * * @par Description: * Applies a vertical filter with coefficients pointed to by 'pi1_coeff' to * the elements pointed by 'pu1_src' and writes to the location pointed by * 'pu1_dst' Input is 16 bits The filter output is downshifted by 6 and * 8192 is subtracted to store it as a 16 bit number The output is used as * a input to weighted prediction * * @param[in] pi2_src * WORD16 pointer to the source * * @param[out] pi2_dst * WORD16 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_luma_vert_w16inp_w16out(WORD16 *pi2_src, WORD16 *pi2_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD32 i4_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < wd; col++) { i4_tmp = 0; for(i = 0; i < NTAPS_LUMA; i++) i4_tmp += pi1_coeff[i] * pi2_src[col + (i - 3) * src_strd]; i4_tmp = (i4_tmp >> SHIFT_14_MINUS_BIT_DEPTH) - OFFSET14; pi2_dst[col] = i4_tmp; } pi2_src += src_strd; pi2_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Chroma interprediction filter for copy * * @par Description: * Copies the array of width 'wd' and height 'ht' from the location pointed * by 'src' to the location pointed by 'dst' * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pu1_dst * UWORD8 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_chroma_copy(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col; UNUSED(pi1_coeff); for(row = 0; row < ht; row++) { for(col = 0; col < 2 * wd; col++) { pu1_dst[col] = pu1_src[col]; } pu1_src += src_strd; pu1_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Chroma interprediction filter for horizontal input * * @par Description: * Applies a horizontal filter with coefficients pointed to by 'pi1_coeff' * to the elements pointed by 'pu1_src' and writes to the location pointed * by 'pu1_dst' The output is downshifted by 6 and clipped to 8 bits * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pu1_dst * UWORD8 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_chroma_horz(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD16 i2_tmp_u, i2_tmp_v; for(row = 0; row < ht; row++) { for(col = 0; col < 2 * wd; col += 2) { i2_tmp_u = 0; i2_tmp_v = 0; for(i = 0; i < NTAPS_CHROMA; i++) { i2_tmp_u += pi1_coeff[i] * pu1_src[col + (i - 1) * 2]; i2_tmp_v += pi1_coeff[i] * pu1_src[col + 1 + (i - 1) * 2]; } i2_tmp_u = (i2_tmp_u + OFFSET_14_MINUS_BIT_DEPTH) >> SHIFT_14_MINUS_BIT_DEPTH; i2_tmp_u = CLIP_U8(i2_tmp_u); i2_tmp_v = (i2_tmp_v + OFFSET_14_MINUS_BIT_DEPTH) >> SHIFT_14_MINUS_BIT_DEPTH; i2_tmp_v = CLIP_U8(i2_tmp_v); pu1_dst[col] = (UWORD8)i2_tmp_u; pu1_dst[col + 1] = (UWORD8)i2_tmp_v; } pu1_src += src_strd; pu1_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Chroma interprediction filter for vertical input * * @par Description: * Applies a vertcal filter with coefficients pointed to by 'pi1_coeff' to * the elements pointed by 'pu1_src' and writes to the location pointed by * 'pu1_dst' The output is downshifted by 6 and clipped to 8 bits * * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pu1_dst * UWORD8 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_chroma_vert(UWORD8 *pu1_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD16 i2_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < 2 * wd; col++) { i2_tmp = 0; for(i = 0; i < NTAPS_CHROMA; i++) { i2_tmp += pi1_coeff[i] * pu1_src[col + (i - 1) * src_strd]; } i2_tmp = (i2_tmp + OFFSET_14_MINUS_BIT_DEPTH) >> SHIFT_14_MINUS_BIT_DEPTH; i2_tmp = CLIP_U8(i2_tmp); pu1_dst[col] = (UWORD8)i2_tmp; } pu1_src += src_strd; pu1_dst += dst_strd; } } /** ******************************************************************************* * * @brief * chroma interprediction filter for copying 16bit output * * @par Description: * Copies the array of width 'wd' and height 'ht' from the location pointed * by 'src' to the location pointed by 'dst' The output is upshifted by 6 * bits and is used as input for vertical filtering or weighted prediction * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pi2_dst * WORD16 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_chroma_copy_w16out(UWORD8 *pu1_src, WORD16 *pi2_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col; UNUSED(pi1_coeff); for(row = 0; row < ht; row++) { for(col = 0; col < 2 * wd; col++) { pi2_dst[col] = (pu1_src[col] << SHIFT_14_MINUS_BIT_DEPTH); } pu1_src += src_strd; pi2_dst += dst_strd; } } /** ******************************************************************************* * * @brief * chroma interprediction filter to store horizontal 16bit ouput * * @par Description: * Applies a horizontal filter with coefficients pointed to by 'pi1_coeff' * to the elements pointed by 'pu1_src' and writes to the location pointed * by 'pu1_dst' No downshifting or clipping is done and the output is used * as an input for vertical filtering or weighted prediction * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pi2_dst * WORD16 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_chroma_horz_w16out(UWORD8 *pu1_src, WORD16 *pi2_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD16 i2_tmp_u, i2_tmp_v; for(row = 0; row < ht; row++) { for(col = 0; col < 2 * wd; col += 2) { i2_tmp_u = 0; i2_tmp_v = 0; for(i = 0; i < NTAPS_CHROMA; i++) { i2_tmp_u += pi1_coeff[i] * pu1_src[col + (i - 1) * 2]; i2_tmp_v += pi1_coeff[i] * pu1_src[col + 1 + (i - 1) * 2]; } pi2_dst[col] = i2_tmp_u; pi2_dst[col + 1] = i2_tmp_v; } pu1_src += src_strd; pi2_dst += dst_strd; } } /** ******************************************************************************* * * @brief * Interprediction chroma filter to store vertical 16bit ouput * * @par Description: * Applies a vertical filter with coefficients pointed to by 'pi1_coeff' to * the elements pointed by 'pu1_src' and writes to the location pointed by * 'pu1_dst' No downshifting or clipping is done and the output is used as * an input for weighted prediction * * @param[in] pu1_src * UWORD8 pointer to the source * * @param[out] pi2_dst * WORD16 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_chroma_vert_w16out(UWORD8 *pu1_src, WORD16 *pi2_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD16 i2_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < 2 * wd; col++) { i2_tmp = 0; for(i = 0; i < NTAPS_CHROMA; i++) { i2_tmp += pi1_coeff[i] * pu1_src[col + (i - 1) * src_strd]; } pi2_dst[col] = i2_tmp; } pu1_src += src_strd; pi2_dst += dst_strd; } } /** ******************************************************************************* * * @brief * chroma interprediction filter for vertical 16bit input * * @par Description: * Applies a vertical filter with coefficients pointed to by 'pi1_coeff' to * the elements pointed by 'pu1_src' and writes to the location pointed by * 'pu1_dst' Input is 16 bits The filter output is downshifted by 12 and * clipped to lie between 0 and 255 * * @param[in] pi2_src * WORD16 pointer to the source * * @param[out] pu1_dst * UWORD8 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_chroma_vert_w16inp(WORD16 *pi2_src, UWORD8 *pu1_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD32 i4_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < 2 * wd; col++) { i4_tmp = 0; for(i = 0; i < NTAPS_CHROMA; i++) { i4_tmp += pi1_coeff[i] * pi2_src[col + (i - 1) * src_strd]; } i4_tmp = ((i4_tmp >> SHIFT_14_MINUS_BIT_DEPTH) + OFFSET_14_MINUS_BIT_DEPTH) >> SHIFT_14_MINUS_BIT_DEPTH; i4_tmp = CLIP_U8(i4_tmp); pu1_dst[col] = i4_tmp; } pi2_src += src_strd; pu1_dst += dst_strd; } } /** ******************************************************************************* * * @brief * * Chroma interprediction filter for 16bit vertical input and output. * * @par Description: * Applies a vertical filter with coefficients pointed to by 'pi1_coeff' to * the elements pointed by 'pu1_src' and writes to the location pointed by * 'pu1_dst' Input is 16 bits The filter output is downshifted by 6 and * 8192 is subtracted to store it as a 16 bit number The output is used as * a input to weighted prediction * * @param[in] pi2_src * WORD16 pointer to the source * * @param[out] pi2_dst * WORD16 pointer to the destination * * @param[in] src_strd * integer source stride * * @param[in] dst_strd * integer destination stride * * @param[in] pi1_coeff * WORD8 pointer to the filter coefficients * * @param[in] ht * integer height of the array * * @param[in] wd * integer width of the array * * @returns * * @remarks * None * ******************************************************************************* */ void ihevc_inter_pred_chroma_vert_w16inp_w16out(WORD16 *pi2_src, WORD16 *pi2_dst, WORD32 src_strd, WORD32 dst_strd, WORD8 *pi1_coeff, WORD32 ht, WORD32 wd) { WORD32 row, col, i; WORD32 i4_tmp; for(row = 0; row < ht; row++) { for(col = 0; col < 2 * wd; col++) { i4_tmp = 0; for(i = 0; i < NTAPS_CHROMA; i++) { i4_tmp += pi1_coeff[i] * pi2_src[col + (i - 1) * src_strd]; } i4_tmp = (i4_tmp >> SHIFT_14_MINUS_BIT_DEPTH); pi2_dst[col] = i4_tmp; } pi2_src += src_strd; pi2_dst += dst_strd; } }