libavfilter/vf_yadif_cuda.c - third_party/ffmpeg - Git at Google

 /*
  * Copyright (C) 2018 Philip Langdale <philipl@overt.org>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg 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.
  *
  * FFmpeg 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 FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #include "libavutil/avassert.h"
 #include "libavutil/hwcontext_cuda_internal.h"
 #include "libavutil/cuda_check.h"
 #include "internal.h"
 #include "yadif.h"

 extern char vf_yadif_cuda_ptx[];

 typedef struct DeintCUDAContext {
     YADIFContext yadif;

     AVCUDADeviceContext *hwctx;
     AVBufferRef         *device_ref;
     AVBufferRef         *input_frames_ref;
     AVHWFramesContext   *input_frames;

     CUcontext   cu_ctx;
     CUstream    stream;
     CUmodule    cu_module;
     CUfunction  cu_func_uchar;
     CUfunction  cu_func_uchar2;
     CUfunction  cu_func_ushort;
     CUfunction  cu_func_ushort2;
 } DeintCUDAContext;

 #define DIV_UP(a, b) ( ((a) + (b) - 1) / (b) )
 #define ALIGN_UP(a, b) (((a) + (b) - 1) & ~((b) - 1))
 #define BLOCKX 32
 #define BLOCKY 16

 #define CHECK_CU(x) FF_CUDA_CHECK_DL(ctx, s->hwctx->internal->cuda_dl, x)

 static CUresult call_kernel(AVFilterContext *ctx, CUfunction func,
                             CUdeviceptr prev, CUdeviceptr cur, CUdeviceptr next,
                             CUarray_format format, int channels,
                             int src_width,  // Width is pixels per channel
                             int src_height, // Height is pixels per channel
                             int src_pitch,  // Pitch is bytes
                             CUdeviceptr dst,
                             int dst_width,  // Width is pixels per channel
                             int dst_height, // Height is pixels per channel
                             int dst_pitch,  // Pitch is pixels per channel
                             int parity, int tff)
 {
     DeintCUDAContext *s = ctx->priv;
     CudaFunctions *cu = s->hwctx->internal->cuda_dl;
     CUtexObject tex_prev = 0, tex_cur = 0, tex_next = 0;
     int ret;
     int skip_spatial_check = s->yadif.mode&2;

     void *args[] = { &dst, &tex_prev, &tex_cur, &tex_next,
                      &dst_width, &dst_height, &dst_pitch,
                      &src_width, &src_height, &parity, &tff,
                      &skip_spatial_check };

     CUDA_TEXTURE_DESC tex_desc = {
         .filterMode = CU_TR_FILTER_MODE_POINT,
         .flags = CU_TRSF_READ_AS_INTEGER,
     };

     CUDA_RESOURCE_DESC res_desc = {
         .resType = CU_RESOURCE_TYPE_PITCH2D,
         .res.pitch2D.format = format,
         .res.pitch2D.numChannels = channels,
         .res.pitch2D.width = src_width,
         .res.pitch2D.height = src_height,
         .res.pitch2D.pitchInBytes = src_pitch,
     };

     res_desc.res.pitch2D.devPtr = (CUdeviceptr)prev;
     ret = CHECK_CU(cu->cuTexObjectCreate(&tex_prev, &res_desc, &tex_desc, NULL));
     if (ret < 0)
         goto exit;

     res_desc.res.pitch2D.devPtr = (CUdeviceptr)cur;
     ret = CHECK_CU(cu->cuTexObjectCreate(&tex_cur, &res_desc, &tex_desc, NULL));
     if (ret < 0)
         goto exit;

     res_desc.res.pitch2D.devPtr = (CUdeviceptr)next;
     ret = CHECK_CU(cu->cuTexObjectCreate(&tex_next, &res_desc, &tex_desc, NULL));
     if (ret < 0)
         goto exit;

     ret = CHECK_CU(cu->cuLaunchKernel(func,
                                       DIV_UP(dst_width, BLOCKX), DIV_UP(dst_height, BLOCKY), 1,
                                       BLOCKX, BLOCKY, 1,
                                       0, s->stream, args, NULL));

 exit:
     if (tex_prev)
         CHECK_CU(cu->cuTexObjectDestroy(tex_prev));
     if (tex_cur)
         CHECK_CU(cu->cuTexObjectDestroy(tex_cur));
     if (tex_next)
         CHECK_CU(cu->cuTexObjectDestroy(tex_next));

     return ret;
 }

 static void filter(AVFilterContext *ctx, AVFrame *dst,
                    int parity, int tff)
 {
     DeintCUDAContext *s = ctx->priv;
     YADIFContext *y = &s->yadif;
     CudaFunctions *cu = s->hwctx->internal->cuda_dl;
     CUcontext dummy;
     int i, ret;

     ret = CHECK_CU(cu->cuCtxPushCurrent(s->cu_ctx));
     if (ret < 0)
         return;

     for (i = 0; i < y->csp->nb_components; i++) {
         CUfunction func;
         CUarray_format format;
         int pixel_size, channels;
         const AVComponentDescriptor *comp = &y->csp->comp[i];

         if (comp->plane < i) {
             // We process planes as a whole, so don't reprocess
             // them for additional components
             continue;
         }

         pixel_size = (comp->depth + comp->shift) / 8;
         channels = comp->step / pixel_size;
         if (pixel_size > 2 || channels > 2) {
             av_log(ctx, AV_LOG_ERROR, "Unsupported pixel format: %s\n", y->csp->name);
             goto exit;
         }
         switch (pixel_size) {
         case 1:
             func = channels == 1 ? s->cu_func_uchar : s->cu_func_uchar2;
             format = CU_AD_FORMAT_UNSIGNED_INT8;
             break;
         case 2:
             func = channels == 1 ? s->cu_func_ushort : s->cu_func_ushort2;
             format = CU_AD_FORMAT_UNSIGNED_INT16;
             break;
         default:
             av_log(ctx, AV_LOG_ERROR, "Unsupported pixel format: %s\n", y->csp->name);
             goto exit;
         }
         av_log(ctx, AV_LOG_TRACE,
                "Deinterlacing plane %d: pixel_size: %d channels: %d\n",
                comp->plane, pixel_size, channels);
         call_kernel(ctx, func,
                     (CUdeviceptr)y->prev->data[i],
                     (CUdeviceptr)y->cur->data[i],
                     (CUdeviceptr)y->next->data[i],
                     format, channels,
                     AV_CEIL_RSHIFT(y->cur->width, i ? y->csp->log2_chroma_w : 0),
                     AV_CEIL_RSHIFT(y->cur->height, i ? y->csp->log2_chroma_h : 0),
                     y->cur->linesize[i],
                     (CUdeviceptr)dst->data[i],
                     AV_CEIL_RSHIFT(dst->width, i ? y->csp->log2_chroma_w : 0),
                     AV_CEIL_RSHIFT(dst->height, i ? y->csp->log2_chroma_h : 0),
                     dst->linesize[i] / comp->step,
                     parity, tff);
     }

 exit:
     CHECK_CU(cu->cuCtxPopCurrent(&dummy));
     return;
 }

 static av_cold void deint_cuda_uninit(AVFilterContext *ctx)
 {
     CUcontext dummy;
     DeintCUDAContext *s = ctx->priv;
     YADIFContext *y = &s->yadif;

     if (s->hwctx && s->cu_module) {
         CudaFunctions *cu = s->hwctx->internal->cuda_dl;
         CHECK_CU(cu->cuCtxPushCurrent(s->cu_ctx));
         CHECK_CU(cu->cuModuleUnload(s->cu_module));
         CHECK_CU(cu->cuCtxPopCurrent(&dummy));
     }

     av_frame_free(&y->prev);
     av_frame_free(&y->cur);
     av_frame_free(&y->next);

     av_buffer_unref(&s->device_ref);
     s->hwctx = NULL;
     av_buffer_unref(&s->input_frames_ref);
     s->input_frames = NULL;
 }

 static int deint_cuda_query_formats(AVFilterContext *ctx)
 {
     enum AVPixelFormat pix_fmts[] = {
         AV_PIX_FMT_CUDA, AV_PIX_FMT_NONE,
     };
     int ret;

     if ((ret = ff_formats_ref(ff_make_format_list(pix_fmts),
                               &ctx->inputs[0]->out_formats)) < 0)
         return ret;
     if ((ret = ff_formats_ref(ff_make_format_list(pix_fmts),
                               &ctx->outputs[0]->in_formats)) < 0)
         return ret;

     return 0;
 }

 static int config_input(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     DeintCUDAContext *s  = ctx->priv;

     if (!inlink->hw_frames_ctx) {
         av_log(ctx, AV_LOG_ERROR, "A hardware frames reference is "
                "required to associate the processing device.\n");
         return AVERROR(EINVAL);
     }

     s->input_frames_ref = av_buffer_ref(inlink->hw_frames_ctx);
     if (!s->input_frames_ref) {
         av_log(ctx, AV_LOG_ERROR, "A input frames reference create "
                "failed.\n");
         return AVERROR(ENOMEM);
     }
     s->input_frames = (AVHWFramesContext*)s->input_frames_ref->data;

     return 0;
 }

 static int config_output(AVFilterLink *link)
 {
     AVHWFramesContext *output_frames;
     AVFilterContext *ctx = link->src;
     DeintCUDAContext *s = ctx->priv;
     YADIFContext *y = &s->yadif;
     CudaFunctions *cu;
     int ret = 0;
     CUcontext dummy;

     av_assert0(s->input_frames);
     s->device_ref = av_buffer_ref(s->input_frames->device_ref);
     if (!s->device_ref) {
         av_log(ctx, AV_LOG_ERROR, "A device reference create "
                "failed.\n");
         return AVERROR(ENOMEM);
     }
     s->hwctx = ((AVHWDeviceContext*)s->device_ref->data)->hwctx;
     s->cu_ctx = s->hwctx->cuda_ctx;
     s->stream = s->hwctx->stream;
     cu = s->hwctx->internal->cuda_dl;

     link->hw_frames_ctx = av_hwframe_ctx_alloc(s->device_ref);
     if (!link->hw_frames_ctx) {
         av_log(ctx, AV_LOG_ERROR, "Failed to create HW frame context "
                "for output.\n");
         ret = AVERROR(ENOMEM);
         goto exit;
     }

     output_frames = (AVHWFramesContext*)link->hw_frames_ctx->data;

     output_frames->format    = AV_PIX_FMT_CUDA;
     output_frames->sw_format = s->input_frames->sw_format;
     output_frames->width     = ctx->inputs[0]->w;
     output_frames->height    = ctx->inputs[0]->h;

     output_frames->initial_pool_size = 4;

     ret = ff_filter_init_hw_frames(ctx, link, 10);
     if (ret < 0)
         goto exit;

     ret = av_hwframe_ctx_init(link->hw_frames_ctx);
     if (ret < 0) {
         av_log(ctx, AV_LOG_ERROR, "Failed to initialise CUDA frame "
                "context for output: %d\n", ret);
         goto exit;
     }

     link->time_base.num = ctx->inputs[0]->time_base.num;
     link->time_base.den = ctx->inputs[0]->time_base.den * 2;
     link->w             = ctx->inputs[0]->w;
     link->h             = ctx->inputs[0]->h;

     if(y->mode & 1)
         link->frame_rate = av_mul_q(ctx->inputs[0]->frame_rate,
                                     (AVRational){2, 1});

     if (link->w < 3 || link->h < 3) {
         av_log(ctx, AV_LOG_ERROR, "Video of less than 3 columns or lines is not supported\n");
         ret = AVERROR(EINVAL);
         goto exit;
     }

     y->csp = av_pix_fmt_desc_get(output_frames->sw_format);
     y->filter = filter;

     ret = CHECK_CU(cu->cuCtxPushCurrent(s->cu_ctx));
     if (ret < 0)
         goto exit;

     ret = CHECK_CU(cu->cuModuleLoadData(&s->cu_module, vf_yadif_cuda_ptx));
     if (ret < 0)
         goto exit;

     ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_uchar, s->cu_module, "yadif_uchar"));
     if (ret < 0)
         goto exit;

     ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_uchar2, s->cu_module, "yadif_uchar2"));
     if (ret < 0)
         goto exit;

     ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_ushort, s->cu_module, "yadif_ushort"));
     if (ret < 0)
         goto exit;

     ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_ushort2, s->cu_module, "yadif_ushort2"));
     if (ret < 0)
         goto exit;

 exit:
     CHECK_CU(cu->cuCtxPopCurrent(&dummy));

     return ret;
 }

 static const AVClass yadif_cuda_class = {
     .class_name = "yadif_cuda",
     .item_name  = av_default_item_name,
     .option     = ff_yadif_options,
     .version    = LIBAVUTIL_VERSION_INT,
     .category   = AV_CLASS_CATEGORY_FILTER,
 };

 static const AVFilterPad deint_cuda_inputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .filter_frame  = ff_yadif_filter_frame,
         .config_props  = config_input,
     },
     { NULL }
 };

 static const AVFilterPad deint_cuda_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .request_frame = ff_yadif_request_frame,
         .config_props  = config_output,
     },
     { NULL }
 };

 AVFilter ff_vf_yadif_cuda = {
     .name           = "yadif_cuda",
     .description    = NULL_IF_CONFIG_SMALL("Deinterlace CUDA frames"),
     .priv_size      = sizeof(DeintCUDAContext),
     .priv_class     = &yadif_cuda_class,
     .uninit         = deint_cuda_uninit,
     .query_formats  = deint_cuda_query_formats,
     .inputs         = deint_cuda_inputs,
     .outputs        = deint_cuda_outputs,
     .flags          = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
     .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
 };
	/*
	* Copyright (C) 2018 Philip Langdale <philipl@overt.org>
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg 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.
	*
	* FFmpeg 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 FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include "libavutil/avassert.h"
	#include "libavutil/hwcontext_cuda_internal.h"
	#include "libavutil/cuda_check.h"
	#include "internal.h"
	#include "yadif.h"

	extern char vf_yadif_cuda_ptx[];

	typedef struct DeintCUDAContext {
	YADIFContext yadif;

	AVCUDADeviceContext *hwctx;
	AVBufferRef *device_ref;
	AVBufferRef *input_frames_ref;
	AVHWFramesContext *input_frames;

	CUcontext cu_ctx;
	CUstream stream;
	CUmodule cu_module;
	CUfunction cu_func_uchar;
	CUfunction cu_func_uchar2;
	CUfunction cu_func_ushort;
	CUfunction cu_func_ushort2;
	} DeintCUDAContext;

	#define DIV_UP(a, b) ( ((a) + (b) - 1) / (b) )
	#define ALIGN_UP(a, b) (((a) + (b) - 1) & ~((b) - 1))
	#define BLOCKX 32
	#define BLOCKY 16

	#define CHECK_CU(x) FF_CUDA_CHECK_DL(ctx, s->hwctx->internal->cuda_dl, x)

	static CUresult call_kernel(AVFilterContext *ctx, CUfunction func,
	CUdeviceptr prev, CUdeviceptr cur, CUdeviceptr next,
	CUarray_format format, int channels,
	int src_width, // Width is pixels per channel
	int src_height, // Height is pixels per channel
	int src_pitch, // Pitch is bytes
	CUdeviceptr dst,
	int dst_width, // Width is pixels per channel
	int dst_height, // Height is pixels per channel
	int dst_pitch, // Pitch is pixels per channel
	int parity, int tff)
	{
	DeintCUDAContext *s = ctx->priv;
	CudaFunctions *cu = s->hwctx->internal->cuda_dl;
	CUtexObject tex_prev = 0, tex_cur = 0, tex_next = 0;
	int ret;
	int skip_spatial_check = s->yadif.mode&2;

	void *args[] = { &dst, &tex_prev, &tex_cur, &tex_next,
	&dst_width, &dst_height, &dst_pitch,
	&src_width, &src_height, &parity, &tff,
	&skip_spatial_check };

	CUDA_TEXTURE_DESC tex_desc = {
	.filterMode = CU_TR_FILTER_MODE_POINT,
	.flags = CU_TRSF_READ_AS_INTEGER,
	};

	CUDA_RESOURCE_DESC res_desc = {
	.resType = CU_RESOURCE_TYPE_PITCH2D,
	.res.pitch2D.format = format,
	.res.pitch2D.numChannels = channels,
	.res.pitch2D.width = src_width,
	.res.pitch2D.height = src_height,
	.res.pitch2D.pitchInBytes = src_pitch,
	};

	res_desc.res.pitch2D.devPtr = (CUdeviceptr)prev;
	ret = CHECK_CU(cu->cuTexObjectCreate(&tex_prev, &res_desc, &tex_desc, NULL));
	if (ret < 0)
	goto exit;

	res_desc.res.pitch2D.devPtr = (CUdeviceptr)cur;
	ret = CHECK_CU(cu->cuTexObjectCreate(&tex_cur, &res_desc, &tex_desc, NULL));
	if (ret < 0)
	goto exit;

	res_desc.res.pitch2D.devPtr = (CUdeviceptr)next;
	ret = CHECK_CU(cu->cuTexObjectCreate(&tex_next, &res_desc, &tex_desc, NULL));
	if (ret < 0)
	goto exit;

	ret = CHECK_CU(cu->cuLaunchKernel(func,
	DIV_UP(dst_width, BLOCKX), DIV_UP(dst_height, BLOCKY), 1,
	BLOCKX, BLOCKY, 1,
	0, s->stream, args, NULL));

	exit:
	if (tex_prev)
	CHECK_CU(cu->cuTexObjectDestroy(tex_prev));
	if (tex_cur)
	CHECK_CU(cu->cuTexObjectDestroy(tex_cur));
	if (tex_next)
	CHECK_CU(cu->cuTexObjectDestroy(tex_next));

	return ret;
	}

	static void filter(AVFilterContext ctx, AVFrame dst,
	int parity, int tff)
	{
	DeintCUDAContext *s = ctx->priv;
	YADIFContext *y = &s->yadif;
	CudaFunctions *cu = s->hwctx->internal->cuda_dl;
	CUcontext dummy;
	int i, ret;

	ret = CHECK_CU(cu->cuCtxPushCurrent(s->cu_ctx));
	if (ret < 0)
	return;

	for (i = 0; i < y->csp->nb_components; i++) {
	CUfunction func;
	CUarray_format format;
	int pixel_size, channels;
	const AVComponentDescriptor *comp = &y->csp->comp[i];

	if (comp->plane < i) {
	// We process planes as a whole, so don't reprocess
	// them for additional components
	continue;
	}

	pixel_size = (comp->depth + comp->shift) / 8;
	channels = comp->step / pixel_size;
	if (pixel_size > 2 \|\| channels > 2) {
	av_log(ctx, AV_LOG_ERROR, "Unsupported pixel format: %s\n", y->csp->name);
	goto exit;
	}
	switch (pixel_size) {
	case 1:
	func = channels == 1 ? s->cu_func_uchar : s->cu_func_uchar2;
	format = CU_AD_FORMAT_UNSIGNED_INT8;
	break;
	case 2:
	func = channels == 1 ? s->cu_func_ushort : s->cu_func_ushort2;
	format = CU_AD_FORMAT_UNSIGNED_INT16;
	break;
	default:
	av_log(ctx, AV_LOG_ERROR, "Unsupported pixel format: %s\n", y->csp->name);
	goto exit;
	}
	av_log(ctx, AV_LOG_TRACE,
	"Deinterlacing plane %d: pixel_size: %d channels: %d\n",
	comp->plane, pixel_size, channels);
	call_kernel(ctx, func,
	(CUdeviceptr)y->prev->data[i],
	(CUdeviceptr)y->cur->data[i],
	(CUdeviceptr)y->next->data[i],
	format, channels,
	AV_CEIL_RSHIFT(y->cur->width, i ? y->csp->log2_chroma_w : 0),
	AV_CEIL_RSHIFT(y->cur->height, i ? y->csp->log2_chroma_h : 0),
	y->cur->linesize[i],
	(CUdeviceptr)dst->data[i],
	AV_CEIL_RSHIFT(dst->width, i ? y->csp->log2_chroma_w : 0),
	AV_CEIL_RSHIFT(dst->height, i ? y->csp->log2_chroma_h : 0),
	dst->linesize[i] / comp->step,
	parity, tff);
	}

	exit:
	CHECK_CU(cu->cuCtxPopCurrent(&dummy));
	return;
	}

	static av_cold void deint_cuda_uninit(AVFilterContext *ctx)
	{
	CUcontext dummy;
	DeintCUDAContext *s = ctx->priv;
	YADIFContext *y = &s->yadif;

	if (s->hwctx && s->cu_module) {
	CudaFunctions *cu = s->hwctx->internal->cuda_dl;
	CHECK_CU(cu->cuCtxPushCurrent(s->cu_ctx));
	CHECK_CU(cu->cuModuleUnload(s->cu_module));
	CHECK_CU(cu->cuCtxPopCurrent(&dummy));
	}

	av_frame_free(&y->prev);
	av_frame_free(&y->cur);
	av_frame_free(&y->next);

	av_buffer_unref(&s->device_ref);
	s->hwctx = NULL;
	av_buffer_unref(&s->input_frames_ref);
	s->input_frames = NULL;
	}

	static int deint_cuda_query_formats(AVFilterContext *ctx)
	{
	enum AVPixelFormat pix_fmts[] = {
	AV_PIX_FMT_CUDA, AV_PIX_FMT_NONE,
	};
	int ret;

	if ((ret = ff_formats_ref(ff_make_format_list(pix_fmts),
	&ctx->inputs[0]->out_formats)) < 0)
	return ret;
	if ((ret = ff_formats_ref(ff_make_format_list(pix_fmts),
	&ctx->outputs[0]->in_formats)) < 0)
	return ret;

	return 0;
	}

	static int config_input(AVFilterLink *inlink)
	{
	AVFilterContext *ctx = inlink->dst;
	DeintCUDAContext *s = ctx->priv;

	if (!inlink->hw_frames_ctx) {
	av_log(ctx, AV_LOG_ERROR, "A hardware frames reference is "
	"required to associate the processing device.\n");
	return AVERROR(EINVAL);
	}

	s->input_frames_ref = av_buffer_ref(inlink->hw_frames_ctx);
	if (!s->input_frames_ref) {
	av_log(ctx, AV_LOG_ERROR, "A input frames reference create "
	"failed.\n");
	return AVERROR(ENOMEM);
	}
	s->input_frames = (AVHWFramesContext*)s->input_frames_ref->data;

	return 0;
	}

	static int config_output(AVFilterLink *link)
	{
	AVHWFramesContext *output_frames;
	AVFilterContext *ctx = link->src;
	DeintCUDAContext *s = ctx->priv;
	YADIFContext *y = &s->yadif;
	CudaFunctions *cu;
	int ret = 0;
	CUcontext dummy;

	av_assert0(s->input_frames);
	s->device_ref = av_buffer_ref(s->input_frames->device_ref);
	if (!s->device_ref) {
	av_log(ctx, AV_LOG_ERROR, "A device reference create "
	"failed.\n");
	return AVERROR(ENOMEM);
	}
	s->hwctx = ((AVHWDeviceContext*)s->device_ref->data)->hwctx;
	s->cu_ctx = s->hwctx->cuda_ctx;
	s->stream = s->hwctx->stream;
	cu = s->hwctx->internal->cuda_dl;

	link->hw_frames_ctx = av_hwframe_ctx_alloc(s->device_ref);
	if (!link->hw_frames_ctx) {
	av_log(ctx, AV_LOG_ERROR, "Failed to create HW frame context "
	"for output.\n");
	ret = AVERROR(ENOMEM);
	goto exit;
	}

	output_frames = (AVHWFramesContext*)link->hw_frames_ctx->data;

	output_frames->format = AV_PIX_FMT_CUDA;
	output_frames->sw_format = s->input_frames->sw_format;
	output_frames->width = ctx->inputs[0]->w;
	output_frames->height = ctx->inputs[0]->h;

	output_frames->initial_pool_size = 4;

	ret = ff_filter_init_hw_frames(ctx, link, 10);
	if (ret < 0)
	goto exit;

	ret = av_hwframe_ctx_init(link->hw_frames_ctx);
	if (ret < 0) {
	av_log(ctx, AV_LOG_ERROR, "Failed to initialise CUDA frame "
	"context for output: %d\n", ret);
	goto exit;
	}

	link->time_base.num = ctx->inputs[0]->time_base.num;
	link->time_base.den = ctx->inputs[0]->time_base.den * 2;
	link->w = ctx->inputs[0]->w;
	link->h = ctx->inputs[0]->h;

	if(y->mode & 1)
	link->frame_rate = av_mul_q(ctx->inputs[0]->frame_rate,
	(AVRational){2, 1});

	if (link->w < 3 \|\| link->h < 3) {
	av_log(ctx, AV_LOG_ERROR, "Video of less than 3 columns or lines is not supported\n");
	ret = AVERROR(EINVAL);
	goto exit;
	}

	y->csp = av_pix_fmt_desc_get(output_frames->sw_format);
	y->filter = filter;

	ret = CHECK_CU(cu->cuCtxPushCurrent(s->cu_ctx));
	if (ret < 0)
	goto exit;

	ret = CHECK_CU(cu->cuModuleLoadData(&s->cu_module, vf_yadif_cuda_ptx));
	if (ret < 0)
	goto exit;

	ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_uchar, s->cu_module, "yadif_uchar"));
	if (ret < 0)
	goto exit;

	ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_uchar2, s->cu_module, "yadif_uchar2"));
	if (ret < 0)
	goto exit;

	ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_ushort, s->cu_module, "yadif_ushort"));
	if (ret < 0)
	goto exit;

	ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_ushort2, s->cu_module, "yadif_ushort2"));
	if (ret < 0)
	goto exit;

	exit:
	CHECK_CU(cu->cuCtxPopCurrent(&dummy));

	return ret;
	}

	static const AVClass yadif_cuda_class = {
	.class_name = "yadif_cuda",
	.item_name = av_default_item_name,
	.option = ff_yadif_options,
	.version = LIBAVUTIL_VERSION_INT,
	.category = AV_CLASS_CATEGORY_FILTER,
	};

	static const AVFilterPad deint_cuda_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.filter_frame = ff_yadif_filter_frame,
	.config_props = config_input,
	},
	{ NULL }
	};

	static const AVFilterPad deint_cuda_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.request_frame = ff_yadif_request_frame,
	.config_props = config_output,
	},
	{ NULL }
	};

	AVFilter ff_vf_yadif_cuda = {
	.name = "yadif_cuda",
	.description = NULL_IF_CONFIG_SMALL("Deinterlace CUDA frames"),
	.priv_size = sizeof(DeintCUDAContext),
	.priv_class = &yadif_cuda_class,
	.uninit = deint_cuda_uninit,
	.query_formats = deint_cuda_query_formats,
	.inputs = deint_cuda_inputs,
	.outputs = deint_cuda_outputs,
	.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
	.flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
	};