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31da97b083
It is sane, but UB. It could happen in case of allocation errors in vc2_encode_init(). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
284 lines
10 KiB
C
284 lines
10 KiB
C
/*
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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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