avfilter/thumbnail_cuda: add cuda thumbnail filter

Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>

1 files changed, 79 insertions, 0 deletions

diff --git a/libavfilter/vf_thumbnail_cuda.cu b/libavfilter/vf_thumbnail_cuda.cu
new file mode 100644
index 0000000000..98fad4303a
--- /dev/null
+++ b/libavfilter/vf_thumbnail_cuda.cu
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+extern "C" {
+
+texture<unsigned char, 2> uchar_tex;
+texture<uchar2, 2>  uchar2_tex;
+texture<unsigned short, 2> ushort_tex;
+texture<ushort2, 2>  ushort2_tex;
+
+__global__ void Thumbnail_uchar(int *histogram, int src_width, int src_height)
+{
+    int x = blockIdx.x * blockDim.x + threadIdx.x;
+    int y = blockIdx.y * blockDim.y + threadIdx.y;
+    if (y < src_height && x < src_width)
+    {
+        unsigned char pixel = tex2D(uchar_tex, x, y);
+        atomicAdd(&histogram[pixel], 1);
+    }
+}
+
+__global__ void Thumbnail_uchar2(int *histogram, int src_width, int src_height)
+{
+    int x = blockIdx.x * blockDim.x + threadIdx.x;
+    int y = blockIdx.y * blockDim.y + threadIdx.y;
+
+    if (y < src_height && x < src_width)
+    {
+        uchar2 pixel = tex2D(uchar2_tex, x, y);
+        atomicAdd(&histogram[pixel.x], 1);
+        atomicAdd(&histogram[256 + pixel.y], 1);
+    }
+}
+
+__global__ void Thumbnail_ushort(int *histogram, int src_width, int src_height)
+{
+    int x = blockIdx.x * blockDim.x + threadIdx.x;
+    int y = blockIdx.y * blockDim.y + threadIdx.y;
+
+    if (y < src_height && x < src_width)
+    {
+        unsigned short pixel = (tex2D(ushort_tex, x, y) + 128) >> 8;
+        atomicAdd(&histogram[pixel], 1);
+    }
+}
+
+__global__ void Thumbnail_ushort2(int *histogram, int src_width, int src_height)
+{
+    int x = blockIdx.x * blockDim.x + threadIdx.x;
+    int y = blockIdx.y * blockDim.y + threadIdx.y;
+
+    if (y < src_height && x < src_width)
+    {
+        ushort2 pixel = tex2D(ushort2_tex, x, y);
+        atomicAdd(&histogram[(pixel.x + 128) >> 8], 1);
+        atomicAdd(&histogram[256 + (pixel.y + 128) >> 8], 1);
+    }
+}
+
+}