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/*
* Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
*
* 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
* Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines
*/
#include "mss2dsp.h"
#include "libavutil/common.h"
static av_always_inline void mss2_blit_wmv9_template(uint8_t *dst,
ptrdiff_t dst_stride,
int gray,
int use_mask,
int maskcolor,
const uint8_t *mask,
ptrdiff_t mask_stride,
const uint8_t *srcy,
ptrdiff_t srcy_stride,
const uint8_t *srcu,
const uint8_t *srcv,
ptrdiff_t srcuv_stride,
int w, int h)
{
int i, j, k, r = -1;
while (++r < h) {
for (i = 0, j = 0, k = 0; i < w; j += (i & 1), i++, k += 3) {
if (!use_mask || mask[i] == maskcolor) {
if (gray) {
dst[k] = dst[k + 1] = dst[k + 2] = 0x80;
} else {
int y = srcy[i];
int u = srcu[j] - 128;
int v = srcv[j] - 128;
dst[k] = av_clip_uint8(y + ( 91881 * v + 32768 >> 16));
dst[k + 1] = av_clip_uint8(y + (-22554 * u - 46802 * v + 32768 >> 16));
dst[k + 2] = av_clip_uint8(y + (116130 * u + 32768 >> 16));
}
}
}
mask += mask_stride;
dst += dst_stride;
srcy += srcy_stride;
srcu += srcuv_stride * (r & 1);
srcv += srcuv_stride * (r & 1);
}
}
static void mss2_blit_wmv9_c(uint8_t *dst, ptrdiff_t dst_stride,
const uint8_t *srcy, ptrdiff_t srcy_stride,
const uint8_t *srcu, const uint8_t *srcv,
ptrdiff_t srcuv_stride, int w, int h)
{
mss2_blit_wmv9_template(dst, dst_stride, 0, 0,
0, NULL, 0,
srcy, srcy_stride,
srcu, srcv, srcuv_stride,
w, h);
}
static void mss2_blit_wmv9_masked_c(uint8_t *dst, ptrdiff_t dst_stride,
int maskcolor, const uint8_t *mask,
ptrdiff_t mask_stride,
const uint8_t *srcy, ptrdiff_t srcy_stride,
const uint8_t *srcu, const uint8_t *srcv,
ptrdiff_t srcuv_stride, int w, int h)
{
mss2_blit_wmv9_template(dst, dst_stride, 0, 1,
maskcolor, mask, mask_stride,
srcy, srcy_stride,
srcu, srcv, srcuv_stride,
w, h);
}
static void mss2_gray_fill_masked_c(uint8_t *dst, ptrdiff_t dst_stride,
int maskcolor, const uint8_t *mask,
ptrdiff_t mask_stride, int w, int h)
{
mss2_blit_wmv9_template(dst, dst_stride, 1, 1,
maskcolor, mask, mask_stride,
NULL, 0,
NULL, NULL, 0,
w, h);
}
static void upsample_plane_c(uint8_t *plane, ptrdiff_t plane_stride, int w, int h)
{
uint8_t *src1, *src2, *dst1, *dst2, *p, a, b;
int i, j;
w += (w & 1);
h += (h & 1);
j = h - 1;
memcpy(plane + plane_stride * j,
plane + plane_stride * (j >> 1),
w);
while ((j -= 2) > 0) {
dst1 = plane + plane_stride * (j + 1);
dst2 = plane + plane_stride * j;
src1 = plane + plane_stride * ((j + 1) >> 1);
src2 = plane + plane_stride * ( j >> 1);
for (i = (w - 1) >> 1; i >= 0; i--) {
a = src1[i];
b = src2[i];
dst1[i] = (3 * a + b + 2) >> 2;
dst2[i] = (a + 3 * b + 2) >> 2;
}
}
for (j = h - 1; j >= 0; j--) {
p = plane + plane_stride * j;
i = w - 1;
p[i] = p[i >> 1];
while ((i -= 2) > 0) {
a = p[ i >> 1];
b = p[(i + 1) >> 1];
p[i] = (3 * a + b + 1) >> 2;
p[i + 1] = (a + 3 * b + 1) >> 2;
}
}
}
av_cold void ff_mss2dsp_init(MSS2DSPContext* dsp)
{
dsp->mss2_blit_wmv9 = mss2_blit_wmv9_c;
dsp->mss2_blit_wmv9_masked = mss2_blit_wmv9_masked_c;
dsp->mss2_gray_fill_masked = mss2_gray_fill_masked_c;
dsp->upsample_plane = upsample_plane_c;
}
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