MSS2 decoder

Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>

1 files changed, 153 insertions, 0 deletions

diff --git a/libavcodec/mss2dsp.c b/libavcodec/mss2dsp.c
new file mode 100644
index 0000000000..aa13577d48
--- /dev/null
+++ b/libavcodec/mss2dsp.c
@@ -0,0 +1,153 @@
+/*
+ * 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,
+                                                     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;
+
+    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;
+}