ffmpeg/libavcodec/mss2dsp.c

   1 /*
   2  * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines
  24  */
  25
  26 #include "mss2dsp.h"
  27 #include "libavutil/common.h"
  28
  29 static av_always_inline void mss2_blit_wmv9_template(uint8_t *dst,
  30                                                      int dst_stride,
  31                                                      int gray,
  32                                                      int use_mask,
  33                                                      int maskcolor,
  34                                                      const uint8_t *mask,
  35                                                      int mask_stride,
  36                                                      const uint8_t *srcy,
  37                                                      int srcy_stride,
  38                                                      const uint8_t *srcu,
  39                                                      const uint8_t *srcv,
  40                                                      int srcuv_stride,
  41                                                      int w, int h)
  42 {
  43     int i, j, k, r = -1;
  44     while (++r < h) {
  45         for (i = 0, j = 0, k = 0; i < w; j += (i & 1), i++, k += 3) {
  46             if (!use_mask || mask[i] == maskcolor) {
  47                 if (gray) {
  48                     dst[k] = dst[k + 1] = dst[k + 2] = 0x80;
  49                 } else {
  50                     int y = srcy[i];
  51                     int u = srcu[j] - 128;
  52                     int v = srcv[j] - 128;
  53                     dst[k]     = av_clip_uint8(y + (             91881 * v + 32768 >> 16));
  54                     dst[k + 1] = av_clip_uint8(y + (-22554 * u - 46802 * v + 32768 >> 16));
  55                     dst[k + 2] = av_clip_uint8(y + (116130 * u             + 32768 >> 16));
  56                 }
  57             }
  58         }
  59         mask +=  mask_stride;
  60         dst  +=   dst_stride;
  61         srcy +=  srcy_stride;
  62         srcu += srcuv_stride * (r & 1);
  63         srcv += srcuv_stride * (r & 1);
  64     }
  65 }
  66
  67 static void mss2_blit_wmv9_c(uint8_t *dst, int dst_stride,
  68                              const uint8_t *srcy, int srcy_stride,
  69                              const uint8_t *srcu, const uint8_t *srcv,
  70                              int srcuv_stride, int w, int h)
  71 {
  72     mss2_blit_wmv9_template(dst, dst_stride, 0, 0,
  73                             0, NULL, 0,
  74                             srcy, srcy_stride,
  75                             srcu, srcv, srcuv_stride,
  76                             w, h);
  77 }
  78
  79 static void mss2_blit_wmv9_masked_c(uint8_t *dst, int dst_stride,
  80                                     int maskcolor, const uint8_t *mask,
  81                                     int mask_stride,
  82                                     const uint8_t *srcy, int srcy_stride,
  83                                     const uint8_t *srcu, const uint8_t *srcv,
  84                                     int srcuv_stride, int w, int h)
  85 {
  86     mss2_blit_wmv9_template(dst, dst_stride, 0, 1,
  87                             maskcolor, mask, mask_stride,
  88                             srcy, srcy_stride,
  89                             srcu, srcv, srcuv_stride,
  90                             w, h);
  91 }
  92
  93 static void mss2_gray_fill_masked_c(uint8_t *dst, int dst_stride,
  94                                     int maskcolor, const uint8_t *mask,
  95                                     int mask_stride, int w, int h)
  96 {
  97     mss2_blit_wmv9_template(dst, dst_stride, 1, 1,
  98                             maskcolor, mask, mask_stride,
  99                             NULL, 0,
 100                             NULL, NULL, 0,
 101                             w, h);
 102 }
 103
 104 static void upsample_plane_c(uint8_t *plane, int plane_stride, int w, int h)
 105 {
 106     uint8_t *src1, *src2, *dst1, *dst2, *p, a, b;
 107     int i, j;
 108
 109     if(!w || !h)
 110         return;
 111
 112     w += (w & 1);
 113     h += (h & 1);
 114
 115     j = h - 1;
 116
 117     memcpy(plane + plane_stride *  j,
 118            plane + plane_stride * (j >> 1),
 119            w);
 120
 121     while ((j -= 2) > 0) {
 122         dst1 = plane + plane_stride *  (j + 1);
 123         dst2 = plane + plane_stride *   j;
 124         src1 = plane + plane_stride * ((j + 1) >> 1);
 125         src2 = plane + plane_stride * ( j      >> 1);
 126
 127         for (i = (w - 1) >> 1; i >= 0; i--) {
 128             a = src1[i];
 129             b = src2[i];
 130             dst1[i] = (3 * a + b + 2) >> 2;
 131             dst2[i] = (a + 3 * b + 2) >> 2;
 132         }
 133     }
 134
 135     for (j = h - 1; j >= 0; j--) {
 136         p = plane + plane_stride * j;
 137         i = w - 1;
 138
 139         p[i] = p[i >> 1];
 140
 141         while ((i -= 2) > 0) {
 142             a = p[ i      >> 1];
 143             b = p[(i + 1) >> 1];
 144             p[i]     = (3 * a + b + 1) >> 2;
 145             p[i + 1] = (a + 3 * b + 1) >> 2;
 146         }
 147     }
 148 }
 149
 150 av_cold void ff_mss2dsp_init(MSS2DSPContext* dsp)
 151 {
 152     dsp->mss2_blit_wmv9        = mss2_blit_wmv9_c;
 153     dsp->mss2_blit_wmv9_masked = mss2_blit_wmv9_masked_c;
 154     dsp->mss2_gray_fill_masked = mss2_gray_fill_masked_c;
 155     dsp->upsample_plane        = upsample_plane_c;
 156 }