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106 lines
3.1 KiB
106 lines
3.1 KiB
/* |
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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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