[FFmpeg-cvslog] avfilter/thumbnail_cuda: add cuda thumbnail filter
Yogender Gupta
git at videolan.org
Fri Sep 22 13:03:09 EEST 2017
ffmpeg | branch: master | Yogender Gupta <ygupta at nvidia.com> | Mon Sep 4 18:36:16 2017 +0530| [21e077fcb3d968e3ed6772a0309e31f94cd7a2a5] | committer: Timo Rothenpieler
avfilter/thumbnail_cuda: add cuda thumbnail filter
Signed-off-by: Timo Rothenpieler <timo at rothenpieler.org>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=21e077fcb3d968e3ed6772a0309e31f94cd7a2a5
---
Changelog | 2 +
configure | 1 +
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/version.h | 2 +-
libavfilter/vf_thumbnail_cuda.c | 444 +++++++++++++++++++++++++++++++++++++++
libavfilter/vf_thumbnail_cuda.cu | 79 +++++++
7 files changed, 529 insertions(+), 1 deletion(-)
diff --git a/Changelog b/Changelog
index ea48e81efe..38b125be39 100644
--- a/Changelog
+++ b/Changelog
@@ -48,6 +48,8 @@ version <next>:
- convolve video filter
- VP9 tile threading support
- KMS screen grabber
+- CUDA thumbnail filter
+
version 3.3:
- CrystalHD decoder moved to new decode API
diff --git a/configure b/configure
index 2de20a02a4..ff9a64292c 100755
--- a/configure
+++ b/configure
@@ -2759,6 +2759,7 @@ vaapi_encode_deps="vaapi"
hwupload_cuda_filter_deps="cuda"
scale_npp_filter_deps="cuda libnpp"
scale_cuda_filter_deps="cuda_sdk"
+thumbnail_cuda_filter_deps="cuda_sdk"
nvenc_deps="cuda"
nvenc_deps_any="dlopen LoadLibrary"
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 8aa974e115..98acb51bcb 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -315,6 +315,7 @@ OBJS-$(CONFIG_TBLEND_FILTER) += vf_blend.o framesync.o
OBJS-$(CONFIG_TELECINE_FILTER) += vf_telecine.o
OBJS-$(CONFIG_THRESHOLD_FILTER) += vf_threshold.o framesync.o
OBJS-$(CONFIG_THUMBNAIL_FILTER) += vf_thumbnail.o
+OBJS-$(CONFIG_THUMBNAIL_CUDA_FILTER) += vf_thumbnail_cuda.o vf_thumbnail_cuda.ptx.o
OBJS-$(CONFIG_TILE_FILTER) += vf_tile.o
OBJS-$(CONFIG_TINTERLACE_FILTER) += vf_tinterlace.o
OBJS-$(CONFIG_TLUT2_FILTER) += vf_lut2.o framesync.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 63e86721cd..baa84a3e72 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -326,6 +326,7 @@ static void register_all(void)
REGISTER_FILTER(TELECINE, telecine, vf);
REGISTER_FILTER(THRESHOLD, threshold, vf);
REGISTER_FILTER(THUMBNAIL, thumbnail, vf);
+ REGISTER_FILTER(THUMBNAIL_CUDA, thumbnail_cuda, vf);
REGISTER_FILTER(TILE, tile, vf);
REGISTER_FILTER(TINTERLACE, tinterlace, vf);
REGISTER_FILTER(TLUT2, tlut2, vf);
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 5d6aa5fc70..fb382d4e25 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 6
-#define LIBAVFILTER_VERSION_MINOR 105
+#define LIBAVFILTER_VERSION_MINOR 106
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_thumbnail_cuda.c b/libavfilter/vf_thumbnail_cuda.c
new file mode 100644
index 0000000000..4c08a85121
--- /dev/null
+++ b/libavfilter/vf_thumbnail_cuda.c
@@ -0,0 +1,444 @@
+/*
+* 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.
+*/
+
+#include <cuda.h>
+
+#include "libavutil/hwcontext.h"
+#include "libavutil/hwcontext_cuda_internal.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+
+#include "avfilter.h"
+#include "internal.h"
+
+#define HIST_SIZE (3*256)
+#define DIV_UP(a, b) ( ((a) + (b) - 1) / (b) )
+#define BLOCKX 32
+#define BLOCKY 16
+
+static const enum AVPixelFormat supported_formats[] = {
+ AV_PIX_FMT_NV12,
+ AV_PIX_FMT_YUV420P,
+ AV_PIX_FMT_YUV444P,
+ AV_PIX_FMT_P010,
+ AV_PIX_FMT_P016,
+ AV_PIX_FMT_YUV444P16,
+};
+
+struct thumb_frame {
+ AVFrame *buf; ///< cached frame
+ int histogram[HIST_SIZE]; ///< RGB color distribution histogram of the frame
+};
+
+typedef struct ThumbnailCudaContext {
+ const AVClass *class;
+ int n; ///< current frame
+ int n_frames; ///< number of frames for analysis
+ struct thumb_frame *frames; ///< the n_frames frames
+ AVRational tb; ///< copy of the input timebase to ease access
+
+ AVBufferRef *hw_frames_ctx;
+
+ CUmodule cu_module;
+
+ CUfunction cu_func_uchar;
+ CUfunction cu_func_uchar2;
+ CUfunction cu_func_ushort;
+ CUfunction cu_func_ushort2;
+ CUtexref cu_tex_uchar;
+ CUtexref cu_tex_uchar2;
+ CUtexref cu_tex_ushort;
+ CUtexref cu_tex_ushort2;
+
+ CUdeviceptr data;
+} ThumbnailCudaContext;
+
+#define OFFSET(x) offsetof(ThumbnailCudaContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption thumbnail_cuda_options[] = {
+ { "n", "set the frames batch size", OFFSET(n_frames), AV_OPT_TYPE_INT, {.i64=100}, 2, INT_MAX, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(thumbnail_cuda);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ ThumbnailCudaContext *s = ctx->priv;
+
+ s->frames = av_calloc(s->n_frames, sizeof(*s->frames));
+ if (!s->frames) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Allocation failure, try to lower the number of frames\n");
+ return AVERROR(ENOMEM);
+ }
+ av_log(ctx, AV_LOG_VERBOSE, "batch size: %d frames\n", s->n_frames);
+ return 0;
+}
+
+/**
+ * @brief Compute Sum-square deviation to estimate "closeness".
+ * @param hist color distribution histogram
+ * @param median average color distribution histogram
+ * @return sum of squared errors
+ */
+static double frame_sum_square_err(const int *hist, const double *median)
+{
+ int i;
+ double err, sum_sq_err = 0;
+
+ for (i = 0; i < HIST_SIZE; i++) {
+ err = median[i] - (double)hist[i];
+ sum_sq_err += err*err;
+ }
+ return sum_sq_err;
+}
+
+static AVFrame *get_best_frame(AVFilterContext *ctx)
+{
+ AVFrame *picref;
+ ThumbnailCudaContext *s = ctx->priv;
+ int i, j, best_frame_idx = 0;
+ int nb_frames = s->n;
+ double avg_hist[HIST_SIZE] = {0}, sq_err, min_sq_err = -1;
+
+ // average histogram of the N frames
+ for (j = 0; j < FF_ARRAY_ELEMS(avg_hist); j++) {
+ for (i = 0; i < nb_frames; i++)
+ avg_hist[j] += (double)s->frames[i].histogram[j];
+ avg_hist[j] /= nb_frames;
+ }
+
+ // find the frame closer to the average using the sum of squared errors
+ for (i = 0; i < nb_frames; i++) {
+ sq_err = frame_sum_square_err(s->frames[i].histogram, avg_hist);
+ if (i == 0 || sq_err < min_sq_err)
+ best_frame_idx = i, min_sq_err = sq_err;
+ }
+
+ // free and reset everything (except the best frame buffer)
+ for (i = 0; i < nb_frames; i++) {
+ memset(s->frames[i].histogram, 0, sizeof(s->frames[i].histogram));
+ if (i != best_frame_idx)
+ av_frame_free(&s->frames[i].buf);
+ }
+ s->n = 0;
+
+ // raise the chosen one
+ picref = s->frames[best_frame_idx].buf;
+ av_log(ctx, AV_LOG_INFO, "frame id #%d (pts_time=%f) selected "
+ "from a set of %d images\n", best_frame_idx,
+ picref->pts * av_q2d(s->tb), nb_frames);
+ s->frames[best_frame_idx].buf = NULL;
+
+ return picref;
+}
+
+static int thumbnail_kernel(ThumbnailCudaContext *s, CUfunction func, CUtexref tex, int channels,
+ int *histogram, uint8_t *src_dptr, int src_width, int src_height, int src_pitch, int pixel_size)
+{
+ CUdeviceptr src_devptr = (CUdeviceptr)src_dptr;
+ void *args[] = { &histogram, &src_width, &src_height };
+ CUDA_ARRAY_DESCRIPTOR desc;
+
+ desc.Width = src_width;
+ desc.Height = src_height;
+ desc.NumChannels = channels;
+ if (pixel_size == 1) {
+ desc.Format = CU_AD_FORMAT_UNSIGNED_INT8;
+ }
+ else {
+ desc.Format = CU_AD_FORMAT_UNSIGNED_INT16;
+ }
+
+ cuTexRefSetAddress2D_v3(tex, &desc, src_devptr, src_pitch);
+ cuLaunchKernel(func, DIV_UP(src_width, BLOCKX), DIV_UP(src_height, BLOCKY), 1, BLOCKX, BLOCKY, 1, 0, 0, args, NULL);
+
+ return 0;
+}
+
+static int thumbnail(AVFilterContext *ctx, int *histogram, AVFrame *in)
+{
+ AVHWFramesContext *in_frames_ctx = (AVHWFramesContext*)in->hw_frames_ctx->data;
+ ThumbnailCudaContext *s = ctx->priv;
+
+ switch (in_frames_ctx->sw_format) {
+ case AV_PIX_FMT_NV12:
+ thumbnail_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
+ histogram, in->data[0], in->width, in->height, in->linesize[0], 1);
+ thumbnail_kernel(s, s->cu_func_uchar2, s->cu_tex_uchar2, 2,
+ histogram + 256, in->data[1], in->width / 2, in->height / 2, in->linesize[1], 1);
+ break;
+ case AV_PIX_FMT_YUV420P:
+ thumbnail_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
+ histogram, in->data[0], in->width, in->height, in->linesize[0], 1);
+ thumbnail_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
+ histogram + 256, in->data[1], in->width / 2, in->height / 2, in->linesize[1], 1);
+ thumbnail_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
+ histogram + 512, in->data[2], in->width / 2, in->height / 2, in->linesize[2], 1);
+ break;
+ case AV_PIX_FMT_YUV444P:
+ thumbnail_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
+ histogram, in->data[0], in->width, in->height, in->linesize[0], 1);
+ thumbnail_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
+ histogram + 256, in->data[1], in->width, in->height, in->linesize[1], 1);
+ thumbnail_kernel(s, s->cu_func_uchar, s->cu_tex_uchar, 1,
+ histogram + 512, in->data[2], in->width, in->height, in->linesize[2], 1);
+ break;
+ case AV_PIX_FMT_P010LE:
+ case AV_PIX_FMT_P016LE:
+ thumbnail_kernel(s, s->cu_func_ushort, s->cu_tex_ushort, 1,
+ histogram, in->data[0], in->width, in->height, in->linesize[0], 2);
+ thumbnail_kernel(s, s->cu_func_ushort2, s->cu_tex_ushort2, 2,
+ histogram + 256, in->data[1], in->width / 2, in->height / 2, in->linesize[1], 2);
+ break;
+ case AV_PIX_FMT_YUV444P16:
+ thumbnail_kernel(s, s->cu_func_ushort2, s->cu_tex_uchar, 1,
+ histogram, in->data[0], in->width, in->height, in->linesize[0], 2);
+ thumbnail_kernel(s, s->cu_func_ushort2, s->cu_tex_uchar, 1,
+ histogram + 256, in->data[1], in->width, in->height, in->linesize[1], 2);
+ thumbnail_kernel(s, s->cu_func_ushort2, s->cu_tex_uchar, 1,
+ histogram + 512, in->data[2], in->width, in->height, in->linesize[2], 2);
+ break;
+ default:
+ return AVERROR_BUG;
+ }
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+ AVFilterContext *ctx = inlink->dst;
+ ThumbnailCudaContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+ int *hist = s->frames[s->n].histogram;
+ AVHWFramesContext *hw_frames_ctx = (AVHWFramesContext*)s->hw_frames_ctx->data;
+ AVCUDADeviceContext *device_hwctx = hw_frames_ctx->device_ctx->hwctx;
+ CUresult err;
+ CUcontext dummy;
+ CUDA_MEMCPY2D cpy = { 0 };
+ int ret = 0;
+
+ // keep a reference of each frame
+ s->frames[s->n].buf = frame;
+
+ err = cuCtxPushCurrent(device_hwctx->cuda_ctx);
+ if (err != CUDA_SUCCESS)
+ return AVERROR_UNKNOWN;
+
+ cuMemsetD8(s->data, 0, HIST_SIZE * sizeof(int));
+
+ thumbnail(ctx, (int*)s->data, frame);
+
+ cpy.srcMemoryType = CU_MEMORYTYPE_DEVICE;
+ cpy.dstMemoryType = CU_MEMORYTYPE_HOST;
+ cpy.srcDevice = s->data;
+ cpy.dstHost = hist;
+ cpy.srcPitch = HIST_SIZE * sizeof(int);
+ cpy.dstPitch = HIST_SIZE * sizeof(int);
+ cpy.WidthInBytes = HIST_SIZE * sizeof(int);
+ cpy.Height = 1;
+
+ err = cuMemcpy2D(&cpy);
+ if (err != CUDA_SUCCESS) {
+ av_log(ctx, AV_LOG_ERROR, "Error transferring the data from the CUDA frame\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ if (hw_frames_ctx->sw_format == AV_PIX_FMT_NV12 || hw_frames_ctx->sw_format == AV_PIX_FMT_YUV420P ||
+ hw_frames_ctx->sw_format == AV_PIX_FMT_P010LE || hw_frames_ctx->sw_format == AV_PIX_FMT_P016LE)
+ {
+ for (int i = 256; i < HIST_SIZE; i++)
+ hist[i] = 4 * hist[i];
+ }
+
+ cuCtxPopCurrent(&dummy);
+ if (ret < 0)
+ return ret;
+
+ // no selection until the buffer of N frames is filled up
+ s->n++;
+ if (s->n < s->n_frames)
+ return 0;
+
+ return ff_filter_frame(outlink, get_best_frame(ctx));
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ int i;
+ ThumbnailCudaContext *s = ctx->priv;
+
+ if (s->data) {
+ cuMemFree(s->data);
+ s->data = 0;
+ }
+
+ if (s->cu_module) {
+ cuModuleUnload(s->cu_module);
+ s->cu_module = NULL;
+ }
+
+ for (i = 0; i < s->n_frames && s->frames[i].buf; i++)
+ av_frame_free(&s->frames[i].buf);
+ av_freep(&s->frames);
+}
+
+static int request_frame(AVFilterLink *link)
+{
+ AVFilterContext *ctx = link->src;
+ ThumbnailCudaContext *s = ctx->priv;
+ int ret = ff_request_frame(ctx->inputs[0]);
+
+ if (ret == AVERROR_EOF && s->n) {
+ ret = ff_filter_frame(link, get_best_frame(ctx));
+ if (ret < 0)
+ return ret;
+ ret = AVERROR_EOF;
+ }
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
+static int format_is_supported(enum AVPixelFormat fmt)
+{
+ int i;
+
+ for (i = 0; i < FF_ARRAY_ELEMS(supported_formats); i++)
+ if (supported_formats[i] == fmt)
+ return 1;
+ return 0;
+}
+
+static int config_props(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ ThumbnailCudaContext *s = ctx->priv;
+ AVHWFramesContext *hw_frames_ctx = (AVHWFramesContext*)inlink->hw_frames_ctx->data;
+ AVCUDADeviceContext *device_hwctx = hw_frames_ctx->device_ctx->hwctx;
+ CUcontext dummy, cuda_ctx = device_hwctx->cuda_ctx;
+ CUresult err;
+
+ extern char vf_thumbnail_cuda_ptx[];
+
+ err = cuCtxPushCurrent(cuda_ctx);
+ if (err != CUDA_SUCCESS) {
+ av_log(ctx, AV_LOG_ERROR, "Error pushing cuda context\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ err = cuModuleLoadData(&s->cu_module, vf_thumbnail_cuda_ptx);
+ if (err != CUDA_SUCCESS) {
+ av_log(ctx, AV_LOG_ERROR, "Error loading module data\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ cuModuleGetFunction(&s->cu_func_uchar, s->cu_module, "Thumbnail_uchar");
+ cuModuleGetFunction(&s->cu_func_uchar2, s->cu_module, "Thumbnail_uchar2");
+ cuModuleGetFunction(&s->cu_func_ushort, s->cu_module, "Thumbnail_ushort");
+ cuModuleGetFunction(&s->cu_func_ushort2, s->cu_module, "Thumbnail_ushort2");
+
+ cuModuleGetTexRef(&s->cu_tex_uchar, s->cu_module, "uchar_tex");
+ cuModuleGetTexRef(&s->cu_tex_uchar2, s->cu_module, "uchar2_tex");
+ cuModuleGetTexRef(&s->cu_tex_ushort, s->cu_module, "ushort_tex");
+ cuModuleGetTexRef(&s->cu_tex_ushort2, s->cu_module, "ushort2_tex");
+
+ cuTexRefSetFlags(s->cu_tex_uchar, CU_TRSF_READ_AS_INTEGER);
+ cuTexRefSetFlags(s->cu_tex_uchar2, CU_TRSF_READ_AS_INTEGER);
+ cuTexRefSetFlags(s->cu_tex_ushort, CU_TRSF_READ_AS_INTEGER);
+ cuTexRefSetFlags(s->cu_tex_ushort2, CU_TRSF_READ_AS_INTEGER);
+
+ cuTexRefSetFilterMode(s->cu_tex_uchar, CU_TR_FILTER_MODE_LINEAR);
+ cuTexRefSetFilterMode(s->cu_tex_uchar2, CU_TR_FILTER_MODE_LINEAR);
+ cuTexRefSetFilterMode(s->cu_tex_ushort, CU_TR_FILTER_MODE_LINEAR);
+ cuTexRefSetFilterMode(s->cu_tex_ushort2, CU_TR_FILTER_MODE_LINEAR);
+
+ err = cuMemAlloc(&s->data, HIST_SIZE * sizeof(int));
+ if (err != CUDA_SUCCESS) {
+ av_log(ctx, AV_LOG_ERROR, "Error allocating cuda memory\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ cuCtxPopCurrent(&dummy);
+
+ s->hw_frames_ctx = ctx->inputs[0]->hw_frames_ctx;
+
+ ctx->outputs[0]->hw_frames_ctx = av_buffer_ref(s->hw_frames_ctx);
+ if (!ctx->outputs[0]->hw_frames_ctx)
+ return AVERROR(ENOMEM);
+
+ s->tb = inlink->time_base;
+
+ if (!format_is_supported(hw_frames_ctx->sw_format)) {
+ av_log(ctx, AV_LOG_ERROR, "Unsupported input format: %s\n", av_get_pix_fmt_name(hw_frames_ctx->sw_format));
+ return AVERROR(ENOSYS);
+ }
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_CUDA,
+ AV_PIX_FMT_NONE
+ };
+ AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+ if (!fmts_list)
+ return AVERROR(ENOMEM);
+ return ff_set_common_formats(ctx, fmts_list);
+}
+
+static const AVFilterPad thumbnail_cuda_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_props,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad thumbnail_cuda_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = request_frame,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_thumbnail_cuda = {
+ .name = "thumbnail_cuda",
+ .description = NULL_IF_CONFIG_SMALL("Select the most representative frame in a given sequence of consecutive frames."),
+ .priv_size = sizeof(ThumbnailCudaContext),
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = thumbnail_cuda_inputs,
+ .outputs = thumbnail_cuda_outputs,
+ .priv_class = &thumbnail_cuda_class,
+ .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
+};
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);
+ }
+}
+
+}
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