0,0 → 1,156 |
/* |
* Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder |
* |
* 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 |
*/ |
|
/** |
* @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, |
int dst_stride, |
int gray, |
int use_mask, |
int maskcolor, |
const uint8_t *mask, |
int mask_stride, |
const uint8_t *srcy, |
int srcy_stride, |
const uint8_t *srcu, |
const uint8_t *srcv, |
int 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, int dst_stride, |
const uint8_t *srcy, int srcy_stride, |
const uint8_t *srcu, const uint8_t *srcv, |
int 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, int dst_stride, |
int maskcolor, const uint8_t *mask, |
int mask_stride, |
const uint8_t *srcy, int srcy_stride, |
const uint8_t *srcu, const uint8_t *srcv, |
int 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, int dst_stride, |
int maskcolor, const uint8_t *mask, |
int 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, int plane_stride, int w, int h) |
{ |
uint8_t *src1, *src2, *dst1, *dst2, *p, a, b; |
int i, j; |
|
if(!w || !h) |
return; |
|
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; |
} |