mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-23 15:53:08 +00:00
126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
/*
|
|
* RV30/40 decoder common dsp functions
|
|
* Copyright (c) 2007 Mike Melanson, Konstantin Shishkov
|
|
* Copyright (c) 2011 Janne Grunau
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* RV30/40 decoder common dsp functions
|
|
*/
|
|
#include "dsputil.h"
|
|
#include "rv34dsp.h"
|
|
|
|
/**
|
|
* @name RV30/40 inverse transform functions
|
|
* @{
|
|
*/
|
|
|
|
static av_always_inline void rv34_row_transform(int temp[16], DCTELEM *block)
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < 4; i++){
|
|
const int z0 = 13*(block[i+8*0] + block[i+8*2]);
|
|
const int z1 = 13*(block[i+8*0] - block[i+8*2]);
|
|
const int z2 = 7* block[i+8*1] - 17*block[i+8*3];
|
|
const int z3 = 17* block[i+8*1] + 7*block[i+8*3];
|
|
|
|
temp[4*i+0] = z0 + z3;
|
|
temp[4*i+1] = z1 + z2;
|
|
temp[4*i+2] = z1 - z2;
|
|
temp[4*i+3] = z0 - z3;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Real Video 3.0/4.0 inverse transform
|
|
* Code is almost the same as in SVQ3, only scaling is different.
|
|
*/
|
|
static void rv34_inv_transform_c(DCTELEM *block){
|
|
int temp[16];
|
|
int i;
|
|
|
|
rv34_row_transform(temp, block);
|
|
|
|
for(i = 0; i < 4; i++){
|
|
const int z0 = 13*(temp[4*0+i] + temp[4*2+i]) + 0x200;
|
|
const int z1 = 13*(temp[4*0+i] - temp[4*2+i]) + 0x200;
|
|
const int z2 = 7* temp[4*1+i] - 17*temp[4*3+i];
|
|
const int z3 = 17* temp[4*1+i] + 7*temp[4*3+i];
|
|
|
|
block[i*8+0] = (z0 + z3) >> 10;
|
|
block[i*8+1] = (z1 + z2) >> 10;
|
|
block[i*8+2] = (z1 - z2) >> 10;
|
|
block[i*8+3] = (z0 - z3) >> 10;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* RealVideo 3.0/4.0 inverse transform for DC block
|
|
*
|
|
* Code is almost the same as rv34_inv_transform()
|
|
* but final coefficients are multiplied by 1.5 and have no rounding.
|
|
*/
|
|
static void rv34_inv_transform_noround_c(DCTELEM *block){
|
|
int temp[16];
|
|
int i;
|
|
|
|
rv34_row_transform(temp, block);
|
|
|
|
for(i = 0; i < 4; i++){
|
|
const int z0 = 13*(temp[4*0+i] + temp[4*2+i]);
|
|
const int z1 = 13*(temp[4*0+i] - temp[4*2+i]);
|
|
const int z2 = 7* temp[4*1+i] - 17*temp[4*3+i];
|
|
const int z3 = 17* temp[4*1+i] + 7*temp[4*3+i];
|
|
|
|
block[i*8+0] = ((z0 + z3) * 3) >> 11;
|
|
block[i*8+1] = ((z1 + z2) * 3) >> 11;
|
|
block[i*8+2] = ((z1 - z2) * 3) >> 11;
|
|
block[i*8+3] = ((z0 - z3) * 3) >> 11;
|
|
}
|
|
}
|
|
|
|
/** @} */ // transform
|
|
|
|
|
|
/**
|
|
* Dequantize ordinary 4x4 block.
|
|
*/
|
|
void ff_rv34_dequant4x4_neon(DCTELEM *block, int Qdc, int Q);
|
|
static void rv34_dequant4x4_c(DCTELEM *block, int Qdc, int Q)
|
|
{
|
|
int i, j;
|
|
|
|
block[0] = (block[0] * Qdc + 8) >> 4;
|
|
for (i = 0; i < 4; i++)
|
|
for (j = !i; j < 4; j++)
|
|
block[j + i*8] = (block[j + i*8] * Q + 8) >> 4;
|
|
}
|
|
|
|
av_cold void ff_rv34dsp_init(RV34DSPContext *c, DSPContext* dsp) {
|
|
c->rv34_inv_transform_tab[0] = rv34_inv_transform_c;
|
|
c->rv34_inv_transform_tab[1] = rv34_inv_transform_noround_c;
|
|
|
|
c->rv34_dequant4x4 = rv34_dequant4x4_c;
|
|
|
|
if (HAVE_NEON)
|
|
ff_rv34dsp_init_neon(c, dsp);
|
|
}
|