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283 lines
10 KiB
283 lines
10 KiB
/* |
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* Copyright (C) 2007 Marco Gerards <marco@gnu.org> |
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* Copyright (C) 2016 Open Broadcast Systems Ltd. |
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* Author 2016 Rostislav Pehlivanov <atomnuker@gmail.com> |
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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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#include "libavutil/attributes.h" |
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#include "libavutil/mem.h" |
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#include "vc2enc_dwt.h" |
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/* Since the transforms spit out interleaved coefficients, this function |
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* rearranges the coefficients into the more traditional subdivision, |
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* making it easier to encode and perform another level. */ |
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static av_always_inline void deinterleave(dwtcoef *linell, ptrdiff_t stride, |
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int width, int height, dwtcoef *synthl) |
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{ |
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int x, y; |
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ptrdiff_t synthw = width << 1; |
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dwtcoef *linehl = linell + width; |
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dwtcoef *linelh = linell + height*stride; |
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dwtcoef *linehh = linelh + width; |
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/* Deinterleave the coefficients. */ |
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for (y = 0; y < height; y++) { |
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for (x = 0; x < width; x++) { |
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linell[x] = synthl[(x << 1)]; |
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linehl[x] = synthl[(x << 1) + 1]; |
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linelh[x] = synthl[(x << 1) + synthw]; |
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linehh[x] = synthl[(x << 1) + synthw + 1]; |
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} |
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synthl += synthw << 1; |
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linell += stride; |
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linelh += stride; |
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linehl += stride; |
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linehh += stride; |
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} |
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} |
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static void vc2_subband_dwt_97(VC2TransformContext *t, dwtcoef *data, |
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ptrdiff_t stride, int width, int height) |
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{ |
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int x, y; |
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dwtcoef *datal = data, *synth = t->buffer, *synthl = synth; |
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const ptrdiff_t synth_width = width << 1; |
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const ptrdiff_t synth_height = height << 1; |
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/* |
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* Shift in one bit that is used for additional precision and copy |
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* the data to the buffer. |
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*/ |
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for (y = 0; y < synth_height; y++) { |
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for (x = 0; x < synth_width; x++) |
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synthl[x] = datal[x] * 2; |
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synthl += synth_width; |
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datal += stride; |
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} |
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/* Horizontal synthesis. */ |
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synthl = synth; |
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for (y = 0; y < synth_height; y++) { |
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/* Lifting stage 2. */ |
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synthl[1] -= (8*synthl[0] + 9*synthl[2] - synthl[4] + 8) >> 4; |
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for (x = 1; x < width - 2; x++) |
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synthl[2*x + 1] -= (9*synthl[2*x] + 9*synthl[2*x + 2] - synthl[2*x + 4] - |
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synthl[2 * x - 2] + 8) >> 4; |
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synthl[synth_width - 1] -= (17*synthl[synth_width - 2] - |
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synthl[synth_width - 4] + 8) >> 4; |
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synthl[synth_width - 3] -= (8*synthl[synth_width - 2] + |
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9*synthl[synth_width - 4] - |
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synthl[synth_width - 6] + 8) >> 4; |
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/* Lifting stage 1. */ |
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synthl[0] += (synthl[1] + synthl[1] + 2) >> 2; |
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for (x = 1; x < width - 1; x++) |
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synthl[2*x] += (synthl[2*x - 1] + synthl[2*x + 1] + 2) >> 2; |
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synthl[synth_width - 2] += (synthl[synth_width - 3] + |
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synthl[synth_width - 1] + 2) >> 2; |
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synthl += synth_width; |
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} |
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/* Vertical synthesis: Lifting stage 2. */ |
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synthl = synth + synth_width; |
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for (x = 0; x < synth_width; x++) |
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synthl[x] -= (8*synthl[x - synth_width] + 9*synthl[x + synth_width] - |
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synthl[x + 3 * synth_width] + 8) >> 4; |
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synthl = synth + (synth_width << 1); |
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for (y = 1; y < height - 2; y++) { |
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for (x = 0; x < synth_width; x++) |
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synthl[x + synth_width] -= (9*synthl[x] + |
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9*synthl[x + 2 * synth_width] - |
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synthl[x - 2 * synth_width] - |
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synthl[x + 4 * synth_width] + 8) >> 4; |
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synthl += synth_width << 1; |
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} |
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synthl = synth + (synth_height - 1) * synth_width; |
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for (x = 0; x < synth_width; x++) { |
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synthl[x] -= (17*synthl[x - synth_width] - |
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synthl[x - 3*synth_width] + 8) >> 4; |
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synthl[x - 2*synth_width] -= (9*synthl[x - 3*synth_width] + |
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8*synthl[x - 1*synth_width] - synthl[x - 5*synth_width] + 8) >> 4; |
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} |
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/* Vertical synthesis: Lifting stage 1. */ |
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synthl = synth; |
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for (x = 0; x < synth_width; x++) |
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synthl[x] += (synthl[x + synth_width] + synthl[x + synth_width] + 2) >> 2; |
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synthl = synth + (synth_width << 1); |
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for (y = 1; y < height - 1; y++) { |
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for (x = 0; x < synth_width; x++) |
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synthl[x] += (synthl[x - synth_width] + synthl[x + synth_width] + 2) >> 2; |
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synthl += synth_width << 1; |
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} |
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synthl = synth + (synth_height - 2) * synth_width; |
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for (x = 0; x < synth_width; x++) |
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synthl[x] += (synthl[x - synth_width] + synthl[x + synth_width] + 2) >> 2; |
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deinterleave(data, stride, width, height, synth); |
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} |
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static void vc2_subband_dwt_53(VC2TransformContext *t, dwtcoef *data, |
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ptrdiff_t stride, int width, int height) |
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{ |
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int x, y; |
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dwtcoef *synth = t->buffer, *synthl = synth, *datal = data; |
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const ptrdiff_t synth_width = width << 1; |
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const ptrdiff_t synth_height = height << 1; |
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/* |
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* Shift in one bit that is used for additional precision and copy |
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* the data to the buffer. |
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*/ |
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for (y = 0; y < synth_height; y++) { |
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for (x = 0; x < synth_width; x++) |
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synthl[x] = datal[x] << 1; |
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synthl += synth_width; |
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datal += stride; |
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} |
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/* Horizontal synthesis. */ |
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synthl = synth; |
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for (y = 0; y < synth_height; y++) { |
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/* Lifting stage 2. */ |
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for (x = 0; x < width - 1; x++) |
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synthl[2 * x + 1] -= (synthl[2 * x] + synthl[2 * x + 2] + 1) >> 1; |
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synthl[synth_width - 1] -= (2*synthl[synth_width - 2] + 1) >> 1; |
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/* Lifting stage 1. */ |
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synthl[0] += (2*synthl[1] + 2) >> 2; |
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for (x = 1; x < width - 1; x++) |
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synthl[2 * x] += (synthl[2 * x - 1] + synthl[2 * x + 1] + 2) >> 2; |
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synthl[synth_width - 2] += (synthl[synth_width - 3] + synthl[synth_width - 1] + 2) >> 2; |
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synthl += synth_width; |
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} |
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/* Vertical synthesis: Lifting stage 2. */ |
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synthl = synth + synth_width; |
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for (x = 0; x < synth_width; x++) |
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synthl[x] -= (synthl[x - synth_width] + synthl[x + synth_width] + 1) >> 1; |
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synthl = synth + (synth_width << 1); |
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for (y = 1; y < height - 1; y++) { |
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for (x = 0; x < synth_width; x++) |
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synthl[x + synth_width] -= (synthl[x] + synthl[x + synth_width * 2] + 1) >> 1; |
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synthl += (synth_width << 1); |
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} |
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synthl = synth + (synth_height - 1) * synth_width; |
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for (x = 0; x < synth_width; x++) |
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synthl[x] -= (2*synthl[x - synth_width] + 1) >> 1; |
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/* Vertical synthesis: Lifting stage 1. */ |
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synthl = synth; |
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for (x = 0; x < synth_width; x++) |
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synthl[x] += (2*synthl[synth_width + x] + 2) >> 2; |
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synthl = synth + (synth_width << 1); |
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for (y = 1; y < height - 1; y++) { |
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for (x = 0; x < synth_width; x++) |
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synthl[x] += (synthl[x + synth_width] + synthl[x - synth_width] + 2) >> 2; |
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synthl += (synth_width << 1); |
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} |
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synthl = synth + (synth_height - 2)*synth_width; |
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for (x = 0; x < synth_width; x++) |
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synthl[x] += (synthl[x - synth_width] + synthl[x + synth_width] + 2) >> 2; |
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deinterleave(data, stride, width, height, synth); |
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} |
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static av_always_inline void dwt_haar(VC2TransformContext *t, dwtcoef *data, |
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ptrdiff_t stride, int width, int height, |
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const int s) |
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{ |
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int x, y; |
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dwtcoef *synth = t->buffer, *synthl = synth, *datal = data; |
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const ptrdiff_t synth_width = width << 1; |
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const ptrdiff_t synth_height = height << 1; |
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/* Horizontal synthesis. */ |
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for (y = 0; y < synth_height; y++) { |
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for (x = 0; x < synth_width; x += 2) { |
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synthl[y*synth_width + x + 1] = (datal[y*stride + x + 1] << s) - |
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(datal[y*stride + x] << s); |
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synthl[y*synth_width + x] = (datal[y*stride + x + 0] << s) + |
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((synthl[y*synth_width + x + 1] + 1) >> 1); |
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} |
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} |
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/* Vertical synthesis. */ |
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for (x = 0; x < synth_width; x++) { |
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for (y = 0; y < synth_height; y += 2) { |
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synthl[(y + 1)*synth_width + x] = synthl[(y + 1)*synth_width + x] - |
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synthl[y*synth_width + x]; |
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synthl[y*synth_width + x] = synthl[y*synth_width + x] + |
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((synthl[(y + 1)*synth_width + x] + 1) >> 1); |
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} |
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} |
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deinterleave(data, stride, width, height, synth); |
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} |
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static void vc2_subband_dwt_haar(VC2TransformContext *t, dwtcoef *data, |
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ptrdiff_t stride, int width, int height) |
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{ |
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dwt_haar(t, data, stride, width, height, 0); |
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} |
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static void vc2_subband_dwt_haar_shift(VC2TransformContext *t, dwtcoef *data, |
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ptrdiff_t stride, int width, int height) |
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{ |
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dwt_haar(t, data, stride, width, height, 1); |
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} |
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av_cold int ff_vc2enc_init_transforms(VC2TransformContext *s, int p_stride, |
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int p_height, int slice_w, int slice_h) |
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{ |
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s->vc2_subband_dwt[VC2_TRANSFORM_9_7] = vc2_subband_dwt_97; |
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s->vc2_subband_dwt[VC2_TRANSFORM_5_3] = vc2_subband_dwt_53; |
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s->vc2_subband_dwt[VC2_TRANSFORM_HAAR] = vc2_subband_dwt_haar; |
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s->vc2_subband_dwt[VC2_TRANSFORM_HAAR_S] = vc2_subband_dwt_haar_shift; |
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/* Pad by the slice size, only matters for non-Haar wavelets */ |
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s->buffer = av_calloc((p_stride + slice_w)*(p_height + slice_h), sizeof(dwtcoef)); |
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if (!s->buffer) |
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return 1; |
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s->padding = (slice_h >> 1)*p_stride + (slice_w >> 1); |
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s->buffer += s->padding; |
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return 0; |
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} |
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av_cold void ff_vc2enc_free_transforms(VC2TransformContext *s) |
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{ |
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if (s->buffer) { |
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av_free(s->buffer - s->padding); |
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s->buffer = NULL; |
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} |
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}
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