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/* |
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* Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder |
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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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/** |
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* @file |
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* Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines |
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*/ |
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#include "mss2dsp.h" |
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#include "libavutil/common.h" |
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static av_always_inline void mss2_blit_wmv9_template(uint8_t *dst, |
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ptrdiff_t dst_stride, |
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int gray, |
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int use_mask, |
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int maskcolor, |
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const uint8_t *mask, |
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ptrdiff_t mask_stride, |
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const uint8_t *srcy, |
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ptrdiff_t srcy_stride, |
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const uint8_t *srcu, |
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const uint8_t *srcv, |
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ptrdiff_t srcuv_stride, |
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int w, int h) |
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{ |
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int i, j, k, r = -1; |
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✓✓ |
19039 |
while (++r < h) { |
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✓✓ |
6081840 |
for (i = 0, j = 0, k = 0; i < w; j += (i & 1), i++, k += 3) { |
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✓✗✓✓
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6062880 |
if (!use_mask || mask[i] == maskcolor) { |
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✗✓ |
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if (gray) { |
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dst[k] = dst[k + 1] = dst[k + 2] = 0x80; |
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} else { |
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5965570 |
int y = srcy[i]; |
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5965570 |
int u = srcu[j] - 128; |
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int v = srcv[j] - 128; |
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dst[k] = av_clip_uint8(y + ( 91881 * v + 32768 >> 16)); |
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dst[k + 1] = av_clip_uint8(y + (-22554 * u - 46802 * v + 32768 >> 16)); |
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dst[k + 2] = av_clip_uint8(y + (116130 * u + 32768 >> 16)); |
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} |
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} |
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} |
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mask += mask_stride; |
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dst += dst_stride; |
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srcy += srcy_stride; |
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srcu += srcuv_stride * (r & 1); |
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srcv += srcuv_stride * (r & 1); |
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} |
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} |
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static void mss2_blit_wmv9_c(uint8_t *dst, ptrdiff_t dst_stride, |
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const uint8_t *srcy, ptrdiff_t srcy_stride, |
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const uint8_t *srcu, const uint8_t *srcv, |
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ptrdiff_t srcuv_stride, int w, int h) |
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{ |
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mss2_blit_wmv9_template(dst, dst_stride, 0, 0, |
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0, NULL, 0, |
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srcy, srcy_stride, |
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srcu, srcv, srcuv_stride, |
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w, h); |
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} |
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static void mss2_blit_wmv9_masked_c(uint8_t *dst, ptrdiff_t dst_stride, |
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int maskcolor, const uint8_t *mask, |
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ptrdiff_t mask_stride, |
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const uint8_t *srcy, ptrdiff_t srcy_stride, |
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const uint8_t *srcu, const uint8_t *srcv, |
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ptrdiff_t srcuv_stride, int w, int h) |
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{ |
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mss2_blit_wmv9_template(dst, dst_stride, 0, 1, |
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maskcolor, mask, mask_stride, |
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srcy, srcy_stride, |
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srcu, srcv, srcuv_stride, |
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w, h); |
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} |
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static void mss2_gray_fill_masked_c(uint8_t *dst, ptrdiff_t dst_stride, |
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int maskcolor, const uint8_t *mask, |
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ptrdiff_t mask_stride, int w, int h) |
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{ |
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mss2_blit_wmv9_template(dst, dst_stride, 1, 1, |
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maskcolor, mask, mask_stride, |
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NULL, 0, |
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NULL, NULL, 0, |
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w, h); |
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} |
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static void upsample_plane_c(uint8_t *plane, ptrdiff_t plane_stride, int w, int h) |
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{ |
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uint8_t *src1, *src2, *dst1, *dst2, *p, a, b; |
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int i, j; |
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✓✗✗✓
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if(!w || !h) |
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return; |
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w += (w & 1); |
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h += (h & 1); |
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j = h - 1; |
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memcpy(plane + plane_stride * j, |
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plane + plane_stride * (j >> 1), |
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w); |
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✓✓ |
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while ((j -= 2) > 0) { |
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dst1 = plane + plane_stride * (j + 1); |
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dst2 = plane + plane_stride * j; |
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src1 = plane + plane_stride * ((j + 1) >> 1); |
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src2 = plane + plane_stride * ( j >> 1); |
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✓✓ |
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for (i = (w - 1) >> 1; i >= 0; i--) { |
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a = src1[i]; |
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b = src2[i]; |
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dst1[i] = (3 * a + b + 2) >> 2; |
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dst2[i] = (a + 3 * b + 2) >> 2; |
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} |
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} |
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✓✓ |
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for (j = h - 1; j >= 0; j--) { |
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p = plane + plane_stride * j; |
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i = w - 1; |
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p[i] = p[i >> 1]; |
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✓✓ |
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while ((i -= 2) > 0) { |
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a = p[ i >> 1]; |
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b = p[(i + 1) >> 1]; |
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p[i] = (3 * a + b + 1) >> 2; |
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p[i + 1] = (a + 3 * b + 1) >> 2; |
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} |
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} |
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} |
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av_cold void ff_mss2dsp_init(MSS2DSPContext* dsp) |
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{ |
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dsp->mss2_blit_wmv9 = mss2_blit_wmv9_c; |
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dsp->mss2_blit_wmv9_masked = mss2_blit_wmv9_masked_c; |
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dsp->mss2_gray_fill_masked = mss2_gray_fill_masked_c; |
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dsp->upsample_plane = upsample_plane_c; |
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} |