GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/rv34dsp.c Lines: 57 57 100.0 %
Date: 2020-09-25 23:16:12 Branches: 14 14 100.0 %

Line Branch Exec Source
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/*
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 * RV30/40 decoder common dsp functions
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 * Copyright (c) 2007 Mike Melanson, Konstantin Shishkov
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 * Copyright (c) 2011 Janne Grunau
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * RV30/40 decoder common dsp functions
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 */
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#include "rv34dsp.h"
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#include "libavutil/common.h"
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/**
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 * @name RV30/40 inverse transform functions
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 * @{
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 */
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static av_always_inline void rv34_row_transform(int temp[16], int16_t *block)
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{
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    int i;
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    for(i = 0; i < 4; i++){
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        const int z0 = 13*(block[i+4*0] +    block[i+4*2]);
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        const int z1 = 13*(block[i+4*0] -    block[i+4*2]);
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        const int z2 =  7* block[i+4*1] - 17*block[i+4*3];
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        const int z3 = 17* block[i+4*1] +  7*block[i+4*3];
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        temp[4*i+0] = z0 + z3;
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        temp[4*i+1] = z1 + z2;
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        temp[4*i+2] = z1 - z2;
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        temp[4*i+3] = z0 - z3;
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    }
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373191
}
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/**
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 * Real Video 3.0/4.0 inverse transform + sample reconstruction
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 * Code is almost the same as in SVQ3, only scaling is different.
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 */
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static void rv34_idct_add_c(uint8_t *dst, ptrdiff_t stride, int16_t *block){
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    int      temp[16];
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    int      i;
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    rv34_row_transform(temp, block);
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    memset(block, 0, 16*sizeof(int16_t));
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    for(i = 0; i < 4; i++){
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        const int z0 = 13*(temp[4*0+i] +    temp[4*2+i]) + 0x200;
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        const int z1 = 13*(temp[4*0+i] -    temp[4*2+i]) + 0x200;
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        const int z2 =  7* temp[4*1+i] - 17*temp[4*3+i];
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        const int z3 = 17* temp[4*1+i] +  7*temp[4*3+i];
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        dst[0] = av_clip_uint8( dst[0] + ( (z0 + z3) >> 10 ) );
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        dst[1] = av_clip_uint8( dst[1] + ( (z1 + z2) >> 10 ) );
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        dst[2] = av_clip_uint8( dst[2] + ( (z1 - z2) >> 10 ) );
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        dst[3] = av_clip_uint8( dst[3] + ( (z0 - z3) >> 10 ) );
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        dst  += stride;
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    }
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}
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/**
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 * RealVideo 3.0/4.0 inverse transform for DC block
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 *
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 * Code is almost the same as rv34_inv_transform()
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 * but final coefficients are multiplied by 1.5 and have no rounding.
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 */
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static void rv34_inv_transform_noround_c(int16_t *block){
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    int temp[16];
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    int i;
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    rv34_row_transform(temp, block);
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    for(i = 0; i < 4; i++){
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        const int z0 = 39*(temp[4*0+i] +    temp[4*2+i]);
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        const int z1 = 39*(temp[4*0+i] -    temp[4*2+i]);
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        const int z2 = 21* temp[4*1+i] - 51*temp[4*3+i];
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        const int z3 = 51* temp[4*1+i] + 21*temp[4*3+i];
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        block[i*4+0] = (z0 + z3) >> 11;
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        block[i*4+1] = (z1 + z2) >> 11;
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        block[i*4+2] = (z1 - z2) >> 11;
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        block[i*4+3] = (z0 - z3) >> 11;
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    }
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}
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static void rv34_idct_dc_add_c(uint8_t *dst, ptrdiff_t stride, int dc)
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{
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    int i, j;
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    dc = (13*13*dc + 0x200) >> 10;
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    for (i = 0; i < 4; i++)
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    {
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        for (j = 0; j < 4; j++)
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            dst[j] = av_clip_uint8( dst[j] + dc );
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        dst += stride;
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    }
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}
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static void rv34_inv_transform_dc_noround_c(int16_t *block)
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{
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    int16_t dc = (13 * 13 * 3 * block[0]) >> 11;
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    int i, j;
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    for (i = 0; i < 4; i++, block += 4)
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        for (j = 0; j < 4; j++)
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            block[j] = dc;
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}
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/** @} */ // transform
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av_cold void ff_rv34dsp_init(RV34DSPContext *c)
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{
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    c->rv34_inv_transform    = rv34_inv_transform_noround_c;
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    c->rv34_inv_transform_dc = rv34_inv_transform_dc_noround_c;
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    c->rv34_idct_add    = rv34_idct_add_c;
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    c->rv34_idct_dc_add = rv34_idct_dc_add_c;
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    if (ARCH_ARM)
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        ff_rv34dsp_init_arm(c);
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    if (ARCH_X86)
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        ff_rv34dsp_init_x86(c);
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}