mirror of https://git.ffmpeg.org/ffmpeg.git
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "dsputil.h"
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#include "rv34dsp.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], DCTELEM *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+8*0] + block[i+8*2]);
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const int z1 = 13*(block[i+8*0] - block[i+8*2]);
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const int z2 = 7* block[i+8*1] - 17*block[i+8*3];
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const int z3 = 17* block[i+8*1] + 7*block[i+8*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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}
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/**
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* Real Video 3.0/4.0 inverse transform
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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_inv_transform_c(DCTELEM *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 = 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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block[i*8+0] = (z0 + z3) >> 10;
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block[i*8+1] = (z1 + z2) >> 10;
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block[i*8+2] = (z1 - z2) >> 10;
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block[i*8+3] = (z0 - z3) >> 10;
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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(DCTELEM *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 = 13*(temp[4*0+i] + temp[4*2+i]);
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const int z1 = 13*(temp[4*0+i] - temp[4*2+i]);
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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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block[i*8+0] = ((z0 + z3) * 3) >> 11;
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block[i*8+1] = ((z1 + z2) * 3) >> 11;
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block[i*8+2] = ((z1 - z2) * 3) >> 11;
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block[i*8+3] = ((z0 - z3) * 3) >> 11;
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}
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}
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/** @} */ // transform
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av_cold void ff_rv34dsp_init(RV34DSPContext *c, DSPContext* dsp) {
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c->rv34_inv_transform_tab[0] = rv34_inv_transform_c;
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c->rv34_inv_transform_tab[1] = rv34_inv_transform_noround_c;
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}
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