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/*
* Copyright (C) 2007 Marco Gerards <marco@gnu.org>
* Copyright (C) 2016 Open Broadcast Systems Ltd.
* Author 2016 Rostislav Pehlivanov <atomnuker@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/attributes.h"
#include "libavutil/mem.h"
#include "vc2enc_dwt.h"
/* Since the transforms spit out interleaved coefficients, this function
* rearranges the coefficients into the more traditional subdivision,
* making it easier to encode and perform another level. */
static av_always_inline void deinterleave(dwtcoef *linell, ptrdiff_t stride,
int width, int height, dwtcoef *synthl)
{
int x, y;
ptrdiff_t synthw = width << 1;
dwtcoef *linehl = linell + width;
dwtcoef *linelh = linell + height*stride;
dwtcoef *linehh = linelh + width;
/* Deinterleave the coefficients. */
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
linell[x] = synthl[(x << 1)];
linehl[x] = synthl[(x << 1) + 1];
linelh[x] = synthl[(x << 1) + synthw];
linehh[x] = synthl[(x << 1) + synthw + 1];
}
synthl += synthw << 1;
linell += stride;
linelh += stride;
linehl += stride;
linehh += stride;
}
}
static void vc2_subband_dwt_97(VC2TransformContext *t, dwtcoef *data,
ptrdiff_t stride, int width, int height)
{
int x, y;
dwtcoef *datal = data, *synth = t->buffer, *synthl = synth;
const ptrdiff_t synth_width = width << 1;
const ptrdiff_t synth_height = height << 1;
/*
* Shift in one bit that is used for additional precision and copy
* the data to the buffer.
*/
for (y = 0; y < synth_height; y++) {
for (x = 0; x < synth_width; x++)
synthl[x] = datal[x] << 1;
synthl += synth_width;
datal += stride;
}
/* Horizontal synthesis. */
synthl = synth;
for (y = 0; y < synth_height; y++) {
/* Lifting stage 2. */
synthl[1] -= (8*synthl[0] + 9*synthl[2] - synthl[4] + 8) >> 4;
for (x = 1; x < width - 2; x++)
synthl[2*x + 1] -= (9*synthl[2*x] + 9*synthl[2*x + 2] - synthl[2*x + 4] -
synthl[2 * x - 2] + 8) >> 4;
synthl[synth_width - 1] -= (17*synthl[synth_width - 2] -
synthl[synth_width - 4] + 8) >> 4;
synthl[synth_width - 3] -= (8*synthl[synth_width - 2] +
9*synthl[synth_width - 4] -
synthl[synth_width - 6] + 8) >> 4;
/* Lifting stage 1. */
synthl[0] += (synthl[1] + synthl[1] + 2) >> 2;
for (x = 1; x < width - 1; x++)
synthl[2*x] += (synthl[2*x - 1] + synthl[2*x + 1] + 2) >> 2;
synthl[synth_width - 2] += (synthl[synth_width - 3] +
synthl[synth_width - 1] + 2) >> 2;
synthl += synth_width;
}
/* Vertical synthesis: Lifting stage 2. */
synthl = synth + synth_width;
for (x = 0; x < synth_width; x++)
synthl[x] -= (8*synthl[x - synth_width] + 9*synthl[x + synth_width] -
synthl[x + 3 * synth_width] + 8) >> 4;
synthl = synth + (synth_width << 1);
for (y = 1; y < height - 2; y++) {
for (x = 0; x < synth_width; x++)
synthl[x + synth_width] -= (9*synthl[x] +
9*synthl[x + 2 * synth_width] -
synthl[x - 2 * synth_width] -
synthl[x + 4 * synth_width] + 8) >> 4;
synthl += synth_width << 1;
}
synthl = synth + (synth_height - 1) * synth_width;
for (x = 0; x < synth_width; x++) {
synthl[x] -= (17*synthl[x - synth_width] -
synthl[x - 3*synth_width] + 8) >> 4;
synthl[x - 2*synth_width] -= (9*synthl[x - 3*synth_width] +
8*synthl[x - 1*synth_width] - synthl[x - 5*synth_width] + 8) >> 4;
}
/* Vertical synthesis: Lifting stage 1. */
synthl = synth;
for (x = 0; x < synth_width; x++)
synthl[x] += (synthl[x + synth_width] + synthl[x + synth_width] + 2) >> 2;
synthl = synth + (synth_width << 1);
for (y = 1; y < height - 1; y++) {
for (x = 0; x < synth_width; x++)
synthl[x] += (synthl[x - synth_width] + synthl[x + synth_width] + 2) >> 2;
synthl += synth_width << 1;
}
synthl = synth + (synth_height - 2) * synth_width;
for (x = 0; x < synth_width; x++)
synthl[x] += (synthl[x - synth_width] + synthl[x + synth_width] + 2) >> 2;
deinterleave(data, stride, width, height, synth);
}
static void vc2_subband_dwt_53(VC2TransformContext *t, dwtcoef *data,
ptrdiff_t stride, int width, int height)
{
int x, y;
dwtcoef *synth = t->buffer, *synthl = synth, *datal = data;
const ptrdiff_t synth_width = width << 1;
const ptrdiff_t synth_height = height << 1;
/*
* Shift in one bit that is used for additional precision and copy
* the data to the buffer.
*/
for (y = 0; y < synth_height; y++) {
for (x = 0; x < synth_width; x++)
synthl[x] = datal[x] << 1;
synthl += synth_width;
datal += stride;
}
/* Horizontal synthesis. */
synthl = synth;
for (y = 0; y < synth_height; y++) {
/* Lifting stage 2. */
for (x = 0; x < width - 1; x++)
synthl[2 * x + 1] -= (synthl[2 * x] + synthl[2 * x + 2] + 1) >> 1;
synthl[synth_width - 1] -= (2*synthl[synth_width - 2] + 1) >> 1;
/* Lifting stage 1. */
synthl[0] += (2*synthl[1] + 2) >> 2;
for (x = 1; x < width - 1; x++)
synthl[2 * x] += (synthl[2 * x - 1] + synthl[2 * x + 1] + 2) >> 2;
synthl[synth_width - 2] += (synthl[synth_width - 3] + synthl[synth_width - 1] + 2) >> 2;
synthl += synth_width;
}
/* Vertical synthesis: Lifting stage 2. */
synthl = synth + synth_width;
for (x = 0; x < synth_width; x++)
synthl[x] -= (synthl[x - synth_width] + synthl[x + synth_width] + 1) >> 1;
synthl = synth + (synth_width << 1);
for (y = 1; y < height - 1; y++) {
for (x = 0; x < synth_width; x++)
synthl[x + synth_width] -= (synthl[x] + synthl[x + synth_width * 2] + 1) >> 1;
synthl += (synth_width << 1);
}
synthl = synth + (synth_height - 1) * synth_width;
for (x = 0; x < synth_width; x++)
synthl[x] -= (2*synthl[x - synth_width] + 1) >> 1;
/* Vertical synthesis: Lifting stage 1. */
synthl = synth;
for (x = 0; x < synth_width; x++)
synthl[x] += (2*synthl[synth_width + x] + 2) >> 2;
synthl = synth + (synth_width << 1);
for (y = 1; y < height - 1; y++) {
for (x = 0; x < synth_width; x++)
synthl[x] += (synthl[x + synth_width] + synthl[x - synth_width] + 2) >> 2;
synthl += (synth_width << 1);
}
synthl = synth + (synth_height - 2)*synth_width;
for (x = 0; x < synth_width; x++)
synthl[x] += (synthl[x - synth_width] + synthl[x + synth_width] + 2) >> 2;
deinterleave(data, stride, width, height, synth);
}
av_cold int ff_vc2enc_init_transforms(VC2TransformContext *s, int p_width, int p_height)
{
s->vc2_subband_dwt[VC2_TRANSFORM_9_7] = vc2_subband_dwt_97;
s->vc2_subband_dwt[VC2_TRANSFORM_5_3] = vc2_subband_dwt_53;
s->buffer = av_malloc(2*p_width*p_height*sizeof(dwtcoef));
if (!s->buffer)
return 1;
return 0;
}
av_cold void ff_vc2enc_free_transforms(VC2TransformContext *s)
{
av_freep(&s->buffer);
} |