mirror of https://git.videolan.org/git/ffmpeg.git
avfilter: add chromakey_cuda filter
GSoC'22 libavfilter/vf_chromakey_cuda.cu:the CUDA kernel for the filter libavfilter/vf_chromakey_cuda.c: the C side that calls the kernel and gets user input libavfilter/allfilters.c: added the filter to it libavfilter/Makefile: added the filter to it cuda/cuda_runtime.h: added two math CUDA functions that are used in the filter Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>
This commit is contained in:
Mohamed Khaled Mohamed
Timo Rothenpieler
parent
538cbaf18e
commit
b1648150b2
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@ -24,6 +24,7 @@ version 5.1:
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- VDPAU AV1 hwaccel
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- PHM image format support
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- remap_opencl filter
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- added chromakey_cuda filter
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version 5.0:
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@ -181,7 +181,9 @@ static inline __device__ double trunc(double a) { return __builtin_trunc(a); }
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static inline __device__ float fabsf(float a) { return __builtin_fabsf(a); }
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static inline __device__ float fabs(float a) { return __builtin_fabsf(a); }
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static inline __device__ double fabs(double a) { return __builtin_fabs(a); }
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static inline __device__ float sqrtf(float a) { return __builtin_sqrtf(a); }
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static inline __device__ float __saturatef(float a) { return __nvvm_saturate_f(a); }
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static inline __device__ float __sinf(float a) { return __nvvm_sin_approx_f(a); }
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static inline __device__ float __cosf(float a) { return __nvvm_cos_approx_f(a); }
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static inline __device__ float __expf(float a) { return __nvvm_ex2_approx_f(a * (float)__builtin_log2(__builtin_exp(1))); }
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@ -8599,6 +8599,7 @@ The command accepts the same syntax of the corresponding option.
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If the specified expression is not valid, it is kept at its current
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value.
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@anchor{chromakey}
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@section chromakey
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YUV colorspace color/chroma keying.
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@ -8651,6 +8652,48 @@ ffmpeg -f lavfi -i color=c=black:s=1280x720 -i video.mp4 -shortest -filter_compl
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@end example
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@end itemize
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@section chromakey_cuda
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CUDA accelerated YUV colorspace color/chroma keying.
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This filter works like normal chromakey filter but operates on CUDA frames.
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for more details and parameters see @ref{chromakey}.
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@subsection Examples
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@itemize
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@item
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Make all the green pixels in the input video transparent and use it as an overlay for another video:
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@example
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./ffmpeg \
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-hwaccel cuda -hwaccel_output_format cuda -i input_green.mp4 \
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-hwaccel cuda -hwaccel_output_format cuda -i base_video.mp4 \
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-init_hw_device cuda \
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-filter_complex \
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" \
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[0:v]chromakey_cuda=0x25302D:0.1:0.12:1[overlay_video]; \
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[1:v]scale_cuda=format=yuv420p[base]; \
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[base][overlay_video]overlay_cuda" \
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-an -sn -c:v h264_nvenc -cq 20 output.mp4
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@end example
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@item
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Process two software sources, explicitly uploading the frames:
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@example
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./ffmpeg -init_hw_device cuda=cuda -filter_hw_device cuda \
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-f lavfi -i color=size=800x600:color=white,format=yuv420p \
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-f lavfi -i yuvtestsrc=size=200x200,format=yuv420p \
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-filter_complex \
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" \
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[0]hwupload[under]; \
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[1]hwupload,chromakey_cuda=green:0.1:0.12[over]; \
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[under][over]overlay_cuda" \
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-c:v hevc_nvenc -cq 18 -preset slow output.mp4
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@end example
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@end itemize
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@section chromanr
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Reduce chrominance noise.
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@ -210,6 +210,8 @@ OBJS-$(CONFIG_CAS_FILTER) += vf_cas.o
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OBJS-$(CONFIG_CHROMABER_VULKAN_FILTER) += vf_chromaber_vulkan.o vulkan.o vulkan_filter.o
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OBJS-$(CONFIG_CHROMAHOLD_FILTER) += vf_chromakey.o
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OBJS-$(CONFIG_CHROMAKEY_FILTER) += vf_chromakey.o
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OBJS-$(CONFIG_CHROMAKEY_CUDA_FILTER) += vf_chromakey_cuda.o vf_chromakey_cuda.ptx.o
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OBJS-$(CONFIG_CHROMANR_FILTER) += vf_chromanr.o
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OBJS-$(CONFIG_CHROMASHIFT_FILTER) += vf_chromashift.o
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OBJS-$(CONFIG_CIESCOPE_FILTER) += vf_ciescope.o
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@ -195,6 +195,7 @@ extern const AVFilter ff_vf_cas;
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extern const AVFilter ff_vf_chromaber_vulkan;
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extern const AVFilter ff_vf_chromahold;
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extern const AVFilter ff_vf_chromakey;
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extern const AVFilter ff_vf_chromakey_cuda;
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extern const AVFilter ff_vf_chromanr;
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extern const AVFilter ff_vf_chromashift;
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extern const AVFilter ff_vf_ciescope;
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@ -31,7 +31,7 @@
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#include "version_major.h"
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#define LIBAVFILTER_VERSION_MINOR 42
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#define LIBAVFILTER_VERSION_MINOR 43
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#define LIBAVFILTER_VERSION_MICRO 100
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@ -0,0 +1,498 @@
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/*
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* Copyright (c) 2022 Mohamed Khaled <Mohamed_Khaled_Kamal@outlook.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <float.h>
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#include <stdio.h>
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#include <string.h>
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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/hwcontext.h"
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#include "libavutil/hwcontext_cuda_internal.h"
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#include "libavutil/cuda_check.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#include "cuda/load_helper.h"
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static const enum AVPixelFormat supported_formats[] = {
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AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_NV12,
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AV_PIX_FMT_YUVA420P
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};
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#define DIV_UP(a, b) (((a) + (b)-1) / (b))
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#define BLOCKX 32
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#define BLOCKY 16
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#define CHECK_CU(x) FF_CUDA_CHECK_DL(ctx, s->hwctx->internal->cuda_dl, x)
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typedef struct ChromakeyCUDAContext {
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const AVClass *class;
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AVCUDADeviceContext *hwctx;
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enum AVPixelFormat in_fmt, out_fmt;
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const AVPixFmtDescriptor *in_desc, *out_desc;
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int in_planes, out_planes;
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int in_plane_depths[4];
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int in_plane_channels[4];
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uint8_t chromakey_rgba[4];
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uint16_t chromakey_uv[2];
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int is_yuv;
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float similarity;
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float blend;
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AVBufferRef *frames_ctx;
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AVFrame *frame;
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AVFrame *tmp_frame;
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CUcontext cu_ctx;
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CUmodule cu_module;
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CUfunction cu_func;
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CUfunction cu_func_uv;
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CUstream cu_stream;
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} ChromakeyCUDAContext;
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static av_cold int cudachromakey_init(AVFilterContext *ctx)
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{
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ChromakeyCUDAContext *s = ctx->priv;
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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s->tmp_frame = av_frame_alloc();
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if (!s->tmp_frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold void cudachromakey_uninit(AVFilterContext *ctx)
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{
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ChromakeyCUDAContext *s = ctx->priv;
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if (s->hwctx && s->cu_module)
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{
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CudaFunctions *cu = s->hwctx->internal->cuda_dl;
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CUcontext context;
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CHECK_CU(cu->cuCtxPushCurrent(s->hwctx->cuda_ctx));
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CHECK_CU(cu->cuModuleUnload(s->cu_module));
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s->cu_module = NULL;
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CHECK_CU(cu->cuCtxPopCurrent(&context));
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}
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av_frame_free(&s->frame);
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av_buffer_unref(&s->frames_ctx);
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av_frame_free(&s->tmp_frame);
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}
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static av_cold int init_hwframe_ctx(ChromakeyCUDAContext *s, AVBufferRef *device_ctx, int width, int height)
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{
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AVBufferRef *out_ref = NULL;
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AVHWFramesContext *out_ctx;
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int ret;
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out_ref = av_hwframe_ctx_alloc(device_ctx);
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if (!out_ref)
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return AVERROR(ENOMEM);
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out_ctx = (AVHWFramesContext *)out_ref->data;
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out_ctx->format = AV_PIX_FMT_CUDA;
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out_ctx->sw_format = s->out_fmt;
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out_ctx->width = width;
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out_ctx->height = height;
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ret = av_hwframe_ctx_init(out_ref);
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if (ret < 0)
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goto fail;
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av_frame_unref(s->frame);
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ret = av_hwframe_get_buffer(out_ref, s->frame, 0);
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if (ret < 0)
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goto fail;
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av_buffer_unref(&s->frames_ctx);
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s->frames_ctx = out_ref;
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return 0;
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fail:
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av_buffer_unref(&out_ref);
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return ret;
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}
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static int format_is_supported(enum AVPixelFormat fmt)
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{
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(supported_formats); i++)
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if (supported_formats[i] == fmt)
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return 1;
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return 0;
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}
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static av_cold void set_format_info(AVFilterContext *ctx, enum AVPixelFormat in_format, enum AVPixelFormat out_format)
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{
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ChromakeyCUDAContext *s = ctx->priv;
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int i, p, d;
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s->in_fmt = in_format;
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s->out_fmt = out_format;
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s->in_desc = av_pix_fmt_desc_get(s->in_fmt);
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s->out_desc = av_pix_fmt_desc_get(s->out_fmt);
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s->in_planes = av_pix_fmt_count_planes(s->in_fmt);
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s->out_planes = av_pix_fmt_count_planes(s->out_fmt);
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// find maximum step of each component of each plane
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// For our subset of formats, this should accurately tell us how many channels CUDA needs
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// i.e. 1 for Y plane, 2 for UV plane of NV12, 4 for single plane of RGB0 formats
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for (i = 0; i < s->in_desc->nb_components; i++)
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{
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d = (s->in_desc->comp[i].depth + 7) / 8;
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p = s->in_desc->comp[i].plane;
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s->in_plane_channels[p] = FFMAX(s->in_plane_channels[p], s->in_desc->comp[i].step / d);
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s->in_plane_depths[p] = s->in_desc->comp[i].depth;
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}
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}
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static av_cold int init_processing_chain(AVFilterContext *ctx, int width, int height)
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{
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ChromakeyCUDAContext *s = ctx->priv;
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AVHWFramesContext *in_frames_ctx;
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int ret;
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/* check that we have a hw context */
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if (!ctx->inputs[0]->hw_frames_ctx)
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{
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av_log(ctx, AV_LOG_ERROR, "No hw context provided on input\n");
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return AVERROR(EINVAL);
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}
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in_frames_ctx = (AVHWFramesContext *)ctx->inputs[0]->hw_frames_ctx->data;
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if (!format_is_supported(in_frames_ctx->sw_format))
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{
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av_log(ctx, AV_LOG_ERROR, "Unsupported format: %s\n", av_get_pix_fmt_name(in_frames_ctx->sw_format));
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return AVERROR(ENOSYS);
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}
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set_format_info(ctx, in_frames_ctx->sw_format, AV_PIX_FMT_YUVA420P);
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ret = init_hwframe_ctx(s, in_frames_ctx->device_ref, width, height);
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if (ret < 0)
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return ret;
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ctx->outputs[0]->hw_frames_ctx = av_buffer_ref(s->frames_ctx);
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if (!ctx->outputs[0]->hw_frames_ctx)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold int cudachromakey_load_functions(AVFilterContext *ctx)
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{
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ChromakeyCUDAContext *s = ctx->priv;
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CUcontext context, cuda_ctx = s->hwctx->cuda_ctx;
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CudaFunctions *cu = s->hwctx->internal->cuda_dl;
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int ret;
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extern const unsigned char ff_vf_chromakey_cuda_ptx_data[];
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extern const unsigned int ff_vf_chromakey_cuda_ptx_len;
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ret = CHECK_CU(cu->cuCtxPushCurrent(cuda_ctx));
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if (ret < 0)
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return ret;
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ret = ff_cuda_load_module(ctx, s->hwctx, &s->cu_module,
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ff_vf_chromakey_cuda_ptx_data, ff_vf_chromakey_cuda_ptx_len);
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if (ret < 0)
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goto fail;
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ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func, s->cu_module, "Process_uchar"));
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if (ret < 0)
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{
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av_log(ctx, AV_LOG_FATAL, "Failed loading Process_uchar\n");
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goto fail;
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}
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ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_uv, s->cu_module, "Process_uchar2"));
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if (ret < 0)
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{
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av_log(ctx, AV_LOG_FATAL, "Failed loading Process_uchar2\n");
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goto fail;
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}
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fail:
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CHECK_CU(cu->cuCtxPopCurrent(&context));
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return ret;
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}
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#define FIXNUM(x) lrint((x) * (1 << 10))
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#define RGB_TO_U(rgb) (((-FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
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#define RGB_TO_V(rgb) (((FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
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static av_cold int cudachromakey_config_props(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = outlink->src->inputs[0];
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ChromakeyCUDAContext *s = ctx->priv;
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AVHWFramesContext *frames_ctx = (AVHWFramesContext *)inlink->hw_frames_ctx->data;
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AVCUDADeviceContext *device_hwctx = frames_ctx->device_ctx->hwctx;
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int ret;
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s->hwctx = device_hwctx;
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s->cu_stream = s->hwctx->stream;
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if (s->is_yuv) {
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s->chromakey_uv[0] = s->chromakey_rgba[1];
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s->chromakey_uv[1] = s->chromakey_rgba[2];
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} else {
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s->chromakey_uv[0] = RGB_TO_U(s->chromakey_rgba);
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s->chromakey_uv[1] = RGB_TO_V(s->chromakey_rgba);
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}
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ret = init_processing_chain(ctx, inlink->w, inlink->h);
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if (ret < 0)
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return ret;
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outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
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ret = cudachromakey_load_functions(ctx);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int call_cuda_kernel(AVFilterContext *ctx, CUfunction func,
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CUtexObject src_tex[3], AVFrame *out_frame,
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int width, int height, int pitch,
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int width_uv, int height_uv, int pitch_uv,
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float u_key, float v_key, float similarity,
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float blend)
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{
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ChromakeyCUDAContext *s = ctx->priv;
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CudaFunctions *cu = s->hwctx->internal->cuda_dl;
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CUdeviceptr dst_devptr[4] = {
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(CUdeviceptr)out_frame->data[0], (CUdeviceptr)out_frame->data[1],
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(CUdeviceptr)out_frame->data[2], (CUdeviceptr)out_frame->data[3]
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};
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void *args_uchar[] = {
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&src_tex[0], &src_tex[1], &src_tex[2],
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&dst_devptr[0], &dst_devptr[1], &dst_devptr[2], &dst_devptr[3],
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&width, &height, &pitch,
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&width_uv, &height_uv, &pitch_uv,
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&u_key, &v_key, &similarity, &blend
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};
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|
||||
return CHECK_CU(cu->cuLaunchKernel(func,
|
||||
DIV_UP(width, BLOCKX), DIV_UP(height, BLOCKY), 1,
|
||||
BLOCKX, BLOCKY, 1, 0, s->cu_stream, args_uchar, NULL));
|
||||
}
|
||||
|
||||
static int cudachromakey_process_internal(AVFilterContext *ctx,
|
||||
AVFrame *out, AVFrame *in)
|
||||
{
|
||||
ChromakeyCUDAContext *s = ctx->priv;
|
||||
CudaFunctions *cu = s->hwctx->internal->cuda_dl;
|
||||
CUcontext context, cuda_ctx = s->hwctx->cuda_ctx;
|
||||
int i, ret;
|
||||
|
||||
CUtexObject tex[3] = {0, 0, 0};
|
||||
|
||||
ret = CHECK_CU(cu->cuCtxPushCurrent(cuda_ctx));
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
for (i = 0; i < s->in_planes; i++)
|
||||
{
|
||||
CUDA_TEXTURE_DESC tex_desc = {
|
||||
.filterMode = CU_TR_FILTER_MODE_LINEAR,
|
||||
.flags = 0, // CU_TRSF_READ_AS_INTEGER to get raw ints instead of normalized floats from tex2D
|
||||
};
|
||||
|
||||
CUDA_RESOURCE_DESC res_desc = {
|
||||
.resType = CU_RESOURCE_TYPE_PITCH2D,
|
||||
.res.pitch2D.format = CU_AD_FORMAT_UNSIGNED_INT8,
|
||||
.res.pitch2D.numChannels = s->in_plane_channels[i],
|
||||
.res.pitch2D.pitchInBytes = in->linesize[i],
|
||||
.res.pitch2D.devPtr = (CUdeviceptr)in->data[i],
|
||||
};
|
||||
|
||||
if (i == 1 || i == 2)
|
||||
{
|
||||
res_desc.res.pitch2D.width = AV_CEIL_RSHIFT(in->width, s->in_desc->log2_chroma_w);
|
||||
res_desc.res.pitch2D.height = AV_CEIL_RSHIFT(in->height, s->in_desc->log2_chroma_h);
|
||||
}
|
||||
else
|
||||
{
|
||||
res_desc.res.pitch2D.width = in->width;
|
||||
res_desc.res.pitch2D.height = in->height;
|
||||
}
|
||||
|
||||
ret = CHECK_CU(cu->cuTexObjectCreate(&tex[i], &res_desc, &tex_desc, NULL));
|
||||
if (ret < 0)
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ret = call_cuda_kernel(ctx, (s->in_plane_channels[1] > 1) ? s->cu_func_uv : s->cu_func,
|
||||
tex, out,
|
||||
out->width, out->height, out->linesize[0],
|
||||
AV_CEIL_RSHIFT(out->width, s->out_desc->log2_chroma_w),
|
||||
AV_CEIL_RSHIFT(out->height, s->out_desc->log2_chroma_h),
|
||||
out->linesize[1],
|
||||
s->chromakey_uv[0], s->chromakey_uv[1],
|
||||
s->similarity, s->blend);
|
||||
if (ret < 0)
|
||||
goto exit;
|
||||
|
||||
exit:
|
||||
for (i = 0; i < s->in_planes; i++)
|
||||
if (tex[i])
|
||||
CHECK_CU(cu->cuTexObjectDestroy(tex[i]));
|
||||
|
||||
CHECK_CU(cu->cuCtxPopCurrent(&context));
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int cudachromakey_process(AVFilterContext *ctx, AVFrame *out, AVFrame *in)
|
||||
{
|
||||
ChromakeyCUDAContext *s = ctx->priv;
|
||||
AVFrame *src = in;
|
||||
int ret;
|
||||
|
||||
ret = cudachromakey_process_internal(ctx, s->frame, src);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
src = s->frame;
|
||||
ret = av_hwframe_get_buffer(src->hw_frames_ctx, s->tmp_frame, 0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
av_frame_move_ref(out, s->frame);
|
||||
av_frame_move_ref(s->frame, s->tmp_frame);
|
||||
|
||||
ret = av_frame_copy_props(out, in);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cudachromakey_filter_frame(AVFilterLink *link, AVFrame *in)
|
||||
{
|
||||
AVFilterContext *ctx = link->dst;
|
||||
ChromakeyCUDAContext *s = ctx->priv;
|
||||
AVFilterLink *outlink = ctx->outputs[0];
|
||||
CudaFunctions *cu = s->hwctx->internal->cuda_dl;
|
||||
|
||||
AVFrame *out = NULL;
|
||||
CUcontext context;
|
||||
int ret = 0;
|
||||
|
||||
out = av_frame_alloc();
|
||||
if (!out)
|
||||
{
|
||||
ret = AVERROR(ENOMEM);
|
||||
goto fail;
|
||||
}
|
||||
|
||||
ret = CHECK_CU(cu->cuCtxPushCurrent(s->hwctx->cuda_ctx));
|
||||
if (ret < 0)
|
||||
goto fail;
|
||||
|
||||
ret = cudachromakey_process(ctx, out, in);
|
||||
|
||||
CHECK_CU(cu->cuCtxPopCurrent(&context));
|
||||
if (ret < 0)
|
||||
goto fail;
|
||||
|
||||
av_frame_free(&in);
|
||||
return ff_filter_frame(outlink, out);
|
||||
fail:
|
||||
av_frame_free(&in);
|
||||
av_frame_free(&out);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#define OFFSET(x) offsetof(ChromakeyCUDAContext, x)
|
||||
#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
|
||||
static const AVOption options[] = {
|
||||
{"color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, {.str = "black"}, 0, 0, FLAGS},
|
||||
{"similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, {.dbl = 0.01}, 0.01, 1.0, FLAGS},
|
||||
{"blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, {.dbl = 0.0}, 0.0, 1.0, FLAGS},
|
||||
{"yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
|
||||
{NULL},
|
||||
};
|
||||
|
||||
static const AVClass cudachromakey_class = {
|
||||
.class_name = "cudachromakey",
|
||||
.item_name = av_default_item_name,
|
||||
.option = options,
|
||||
.version = LIBAVUTIL_VERSION_INT,
|
||||
};
|
||||
|
||||
static const AVFilterPad cudachromakey_inputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.filter_frame = cudachromakey_filter_frame,
|
||||
},
|
||||
};
|
||||
|
||||
static const AVFilterPad cudachromakey_outputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.config_props = cudachromakey_config_props,
|
||||
},
|
||||
};
|
||||
|
||||
const AVFilter ff_vf_chromakey_cuda = {
|
||||
.name = "chromakey_cuda",
|
||||
.description = NULL_IF_CONFIG_SMALL("GPU accelerated chromakey filter"),
|
||||
|
||||
.init = cudachromakey_init,
|
||||
.uninit = cudachromakey_uninit,
|
||||
|
||||
.priv_size = sizeof(ChromakeyCUDAContext),
|
||||
.priv_class = &cudachromakey_class,
|
||||
|
||||
FILTER_INPUTS(cudachromakey_inputs),
|
||||
FILTER_OUTPUTS(cudachromakey_outputs),
|
||||
|
||||
FILTER_SINGLE_PIXFMT(AV_PIX_FMT_CUDA),
|
||||
|
||||
.flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
|
||||
};
|
||||
|
|
@ -0,0 +1,174 @@
|
|||
/*
|
||||
* Copyright (c) 2022 Mohamed Khaled <Mohamed_Khaled_Kamal@outlook.com>
|
||||
*
|
||||
* 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 "cuda/vector_helpers.cuh"
|
||||
|
||||
extern "C"
|
||||
{
|
||||
|
||||
/**
|
||||
* @brief function contains the main logic of chroma keying, and changes the alpahc channel with the suitable value
|
||||
*
|
||||
* @param src_tex texture U or texture UV , decided based on the passed is_uchar2 flag
|
||||
* @param src_tex_V texture V , used only if is_uchar2 flag is false
|
||||
* @param dst_A alpha channel destination
|
||||
* @param width_uv width of uv channels
|
||||
* @param height_uv height of uv channels
|
||||
* @param width width of alpha channel
|
||||
* @param height height of alpha channel
|
||||
* @param pitch pitch of alpha channel
|
||||
* @param x current x coordinate of pixel
|
||||
* @param y current y coordinate of pixel
|
||||
* @param chromakey_uv uv values for chroma keying
|
||||
* @param similarity similarity of keying
|
||||
* @param blend blend of keying
|
||||
*/
|
||||
__device__ static inline void change_alpha_channel(
|
||||
cudaTextureObject_t src_tex, cudaTextureObject_t src_tex_V, uchar *dst_A,
|
||||
int width_uv, int height_uv,
|
||||
int width, int height, int pitch,
|
||||
int x, int y,
|
||||
float2 chromakey_uv, float similarity, float blend)
|
||||
{
|
||||
int window_size = 3;
|
||||
int start_r = x - window_size / 2;
|
||||
int start_c = y - window_size / 2;
|
||||
int resize_ratio = width / width_uv;
|
||||
int counter = 0;
|
||||
float diff = 0.0f;
|
||||
float du, dv;
|
||||
uchar alpha_value;
|
||||
|
||||
// loop over the eight neighbourhood of the current pixel(x,y)
|
||||
for (uchar i = 0; i < window_size; i++)
|
||||
{
|
||||
for (uchar j = 0; j < window_size; j++)
|
||||
{
|
||||
float u_value, v_value;
|
||||
int r = start_r + i;
|
||||
int c = start_c + j;
|
||||
|
||||
if (r < 0 || r >= width_uv || c < 0 || c >= height_uv)
|
||||
continue;
|
||||
|
||||
if (!src_tex_V) {
|
||||
float2 temp_uv = tex2D<float2>(src_tex, r, c);
|
||||
u_value = temp_uv.x;
|
||||
v_value = temp_uv.y;
|
||||
} else {
|
||||
u_value = tex2D<float>(src_tex, r, c);
|
||||
v_value = tex2D<float>(src_tex_V, r, c);
|
||||
}
|
||||
|
||||
du = (u_value * 255.0f) - chromakey_uv.x;
|
||||
dv = (v_value * 255.0f) - chromakey_uv.y;
|
||||
diff += sqrtf((du * du + dv * dv) / (255.0f * 255.0f * 2.f));
|
||||
|
||||
counter++;
|
||||
}
|
||||
}
|
||||
|
||||
if (counter > 0)
|
||||
diff = diff / counter;
|
||||
else
|
||||
diff /= 9.0f;
|
||||
|
||||
if (blend>0.0001f)
|
||||
alpha_value = __saturatef((diff - similarity) / blend) * 255;
|
||||
else
|
||||
alpha_value = (diff < similarity) ? 0 : 255;
|
||||
|
||||
//write the value in the alpha channel with regarding the ratio of (alpha_size : uv_size)
|
||||
for (uchar k = 0; k < resize_ratio; k++)
|
||||
{
|
||||
for (uchar l = 0; l < resize_ratio; l++)
|
||||
{
|
||||
int x_resize = x * resize_ratio + k;
|
||||
int y_resize = y * resize_ratio + l;
|
||||
int a_channel_resize = y_resize * pitch + x_resize;
|
||||
|
||||
if (y_resize >= height || x_resize >= width)
|
||||
continue;
|
||||
|
||||
dst_A[a_channel_resize] = alpha_value;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
__global__ void Process_uchar(
|
||||
cudaTextureObject_t src_tex_Y, cudaTextureObject_t src_tex_U, cudaTextureObject_t src_tex_V,
|
||||
uchar *dst_Y, uchar *dst_U, uchar *dst_V, uchar *dst_A,
|
||||
int width, int height, int pitch,
|
||||
int width_uv, int height_uv, int pitch_uv,
|
||||
float u_key, float v_key, float similarity, float blend)
|
||||
{
|
||||
int x = blockIdx.x * blockDim.x + threadIdx.x;
|
||||
int y = blockIdx.y * blockDim.y + threadIdx.y;
|
||||
|
||||
if (y >= height || x >= width)
|
||||
return;
|
||||
|
||||
dst_Y[y * pitch + x] = tex2D<float>(src_tex_Y, x, y)*255;
|
||||
|
||||
if (y >= height_uv || x >= width_uv)
|
||||
return;
|
||||
|
||||
int uv_index = y * pitch_uv + x;
|
||||
dst_U[uv_index] = tex2D<float>(src_tex_U, x, y) * 255;
|
||||
dst_V[uv_index] = tex2D<float>(src_tex_V, x, y) * 255;
|
||||
|
||||
change_alpha_channel(src_tex_U, src_tex_V, dst_A,
|
||||
width_uv, height_uv,
|
||||
width, height, pitch,
|
||||
x, y,
|
||||
make_float2(u_key, v_key), similarity, blend);
|
||||
}
|
||||
|
||||
__global__ void Process_uchar2(
|
||||
cudaTextureObject_t src_tex_Y, cudaTextureObject_t src_tex_UV, cudaTextureObject_t unused1,
|
||||
uchar *dst_Y, uchar *dst_U, uchar *dst_V, uchar *dst_A,
|
||||
int width, int height, int pitch,
|
||||
int width_uv, int height_uv,int pitch_uv,
|
||||
float u_key, float v_key, float similarity, float blend)
|
||||
{
|
||||
int x = blockIdx.x * blockDim.x + threadIdx.x; // x coordinate of current pixel
|
||||
int y = blockIdx.y * blockDim.y + threadIdx.y; // y coordinate of current pixel
|
||||
|
||||
if (y >= height || x >= width)
|
||||
return;
|
||||
|
||||
dst_Y[y * pitch + x] = tex2D<float>(src_tex_Y, x, y) * 255;
|
||||
|
||||
if (y >= height_uv || x >= width_uv)
|
||||
return;
|
||||
|
||||
int uv_index = y * pitch_uv + x;
|
||||
float2 uv_temp = tex2D<float2>(src_tex_UV, x, y);
|
||||
dst_U[uv_index] = uv_temp.x * 255;
|
||||
dst_V[uv_index] = uv_temp.y * 255;
|
||||
|
||||
change_alpha_channel(src_tex_UV, (cudaTextureObject_t)nullptr,
|
||||
dst_A, width_uv, height_uv,
|
||||
width, height, pitch,
|
||||
x, y,
|
||||
make_float2(u_key, v_key), similarity, blend);
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue