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ffmpeg/libavfilter/vf_chromakey_cuda.c

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/*
* 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 <float.h>
#include <stdio.h>
#include "libavutil/common.h"
#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_cuda_internal.h"
#include "libavutil/cuda_check.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
#include "cuda/load_helper.h"
static const enum AVPixelFormat supported_formats[] = {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NV12,
AV_PIX_FMT_YUVA420P
};
#define DIV_UP(a, b) (((a) + (b)-1) / (b))
#define BLOCKX 32
#define BLOCKY 16
#define CHECK_CU(x) FF_CUDA_CHECK_DL(ctx, s->hwctx->internal->cuda_dl, x)
typedef struct ChromakeyCUDAContext {
const AVClass *class;
AVCUDADeviceContext *hwctx;
enum AVPixelFormat in_fmt, out_fmt;
const AVPixFmtDescriptor *in_desc, *out_desc;
int in_planes, out_planes;
int in_plane_depths[4];
int in_plane_channels[4];
uint8_t chromakey_rgba[4];
uint16_t chromakey_uv[2];
int is_yuv;
float similarity;
float blend;
AVBufferRef *frames_ctx;
AVFrame *frame;
AVFrame *tmp_frame;
CUcontext cu_ctx;
CUmodule cu_module;
CUfunction cu_func;
CUfunction cu_func_uv;
CUstream cu_stream;
} ChromakeyCUDAContext;
static av_cold int cudachromakey_init(AVFilterContext *ctx)
{
ChromakeyCUDAContext *s = ctx->priv;
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
s->tmp_frame = av_frame_alloc();
if (!s->tmp_frame)
return AVERROR(ENOMEM);
return 0;
}
static av_cold void cudachromakey_uninit(AVFilterContext *ctx)
{
ChromakeyCUDAContext *s = ctx->priv;
if (s->hwctx && s->cu_module)
{
CudaFunctions *cu = s->hwctx->internal->cuda_dl;
CUcontext context;
CHECK_CU(cu->cuCtxPushCurrent(s->hwctx->cuda_ctx));
CHECK_CU(cu->cuModuleUnload(s->cu_module));
s->cu_module = NULL;
CHECK_CU(cu->cuCtxPopCurrent(&context));
}
av_frame_free(&s->frame);
av_buffer_unref(&s->frames_ctx);
av_frame_free(&s->tmp_frame);
}
static av_cold int init_hwframe_ctx(ChromakeyCUDAContext *s, AVBufferRef *device_ctx, int width, int height)
{
AVBufferRef *out_ref = NULL;
AVHWFramesContext *out_ctx;
int ret;
out_ref = av_hwframe_ctx_alloc(device_ctx);
if (!out_ref)
return AVERROR(ENOMEM);
out_ctx = (AVHWFramesContext *)out_ref->data;
out_ctx->format = AV_PIX_FMT_CUDA;
out_ctx->sw_format = s->out_fmt;
out_ctx->width = width;
out_ctx->height = height;
ret = av_hwframe_ctx_init(out_ref);
if (ret < 0)
goto fail;
av_frame_unref(s->frame);
ret = av_hwframe_get_buffer(out_ref, s->frame, 0);
if (ret < 0)
goto fail;
av_buffer_unref(&s->frames_ctx);
s->frames_ctx = out_ref;
return 0;
fail:
av_buffer_unref(&out_ref);
return ret;
}
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 av_cold void set_format_info(AVFilterContext *ctx, enum AVPixelFormat in_format, enum AVPixelFormat out_format)
{
ChromakeyCUDAContext *s = ctx->priv;
int i, p, d;
s->in_fmt = in_format;
s->out_fmt = out_format;
s->in_desc = av_pix_fmt_desc_get(s->in_fmt);
s->out_desc = av_pix_fmt_desc_get(s->out_fmt);
s->in_planes = av_pix_fmt_count_planes(s->in_fmt);
s->out_planes = av_pix_fmt_count_planes(s->out_fmt);
// find maximum step of each component of each plane
// For our subset of formats, this should accurately tell us how many channels CUDA needs
// i.e. 1 for Y plane, 2 for UV plane of NV12, 4 for single plane of RGB0 formats
for (i = 0; i < s->in_desc->nb_components; i++)
{
d = (s->in_desc->comp[i].depth + 7) / 8;
p = s->in_desc->comp[i].plane;
s->in_plane_channels[p] = FFMAX(s->in_plane_channels[p], s->in_desc->comp[i].step / d);
s->in_plane_depths[p] = s->in_desc->comp[i].depth;
}
}
static av_cold int init_processing_chain(AVFilterContext *ctx, int width, int height)
{
ChromakeyCUDAContext *s = ctx->priv;
AVHWFramesContext *in_frames_ctx;
int ret;
/* check that we have a hw context */
if (!ctx->inputs[0]->hw_frames_ctx)
{
av_log(ctx, AV_LOG_ERROR, "No hw context provided on input\n");
return AVERROR(EINVAL);
}
in_frames_ctx = (AVHWFramesContext *)ctx->inputs[0]->hw_frames_ctx->data;
if (!format_is_supported(in_frames_ctx->sw_format))
{
av_log(ctx, AV_LOG_ERROR, "Unsupported format: %s\n", av_get_pix_fmt_name(in_frames_ctx->sw_format));
return AVERROR(ENOSYS);
}
set_format_info(ctx, in_frames_ctx->sw_format, AV_PIX_FMT_YUVA420P);
ret = init_hwframe_ctx(s, in_frames_ctx->device_ref, width, height);
if (ret < 0)
return ret;
ctx->outputs[0]->hw_frames_ctx = av_buffer_ref(s->frames_ctx);
if (!ctx->outputs[0]->hw_frames_ctx)
return AVERROR(ENOMEM);
return 0;
}
static av_cold int cudachromakey_load_functions(AVFilterContext *ctx)
{
ChromakeyCUDAContext *s = ctx->priv;
CUcontext context, cuda_ctx = s->hwctx->cuda_ctx;
CudaFunctions *cu = s->hwctx->internal->cuda_dl;
int ret;
extern const unsigned char ff_vf_chromakey_cuda_ptx_data[];
extern const unsigned int ff_vf_chromakey_cuda_ptx_len;
ret = CHECK_CU(cu->cuCtxPushCurrent(cuda_ctx));
if (ret < 0)
return ret;
ret = ff_cuda_load_module(ctx, s->hwctx, &s->cu_module,
ff_vf_chromakey_cuda_ptx_data, ff_vf_chromakey_cuda_ptx_len);
if (ret < 0)
goto fail;
ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func, s->cu_module, "Process_uchar"));
if (ret < 0)
{
av_log(ctx, AV_LOG_FATAL, "Failed loading Process_uchar\n");
goto fail;
}
ret = CHECK_CU(cu->cuModuleGetFunction(&s->cu_func_uv, s->cu_module, "Process_uchar2"));
if (ret < 0)
{
av_log(ctx, AV_LOG_FATAL, "Failed loading Process_uchar2\n");
goto fail;
}
fail:
CHECK_CU(cu->cuCtxPopCurrent(&context));
return ret;
}
#define FIXNUM(x) lrint((x) * (1 << 10))
#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)
#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)
static av_cold int cudachromakey_config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = outlink->src->inputs[0];
ChromakeyCUDAContext *s = ctx->priv;
AVHWFramesContext *frames_ctx = (AVHWFramesContext *)inlink->hw_frames_ctx->data;
AVCUDADeviceContext *device_hwctx = frames_ctx->device_ctx->hwctx;
int ret;
s->hwctx = device_hwctx;
s->cu_stream = s->hwctx->stream;
if (s->is_yuv) {
s->chromakey_uv[0] = s->chromakey_rgba[1];
s->chromakey_uv[1] = s->chromakey_rgba[2];
} else {
s->chromakey_uv[0] = RGB_TO_U(s->chromakey_rgba);
s->chromakey_uv[1] = RGB_TO_V(s->chromakey_rgba);
}
ret = init_processing_chain(ctx, inlink->w, inlink->h);
if (ret < 0)
return ret;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
ret = cudachromakey_load_functions(ctx);
if (ret < 0)
return ret;
return 0;
}
static int call_cuda_kernel(AVFilterContext *ctx, CUfunction func,
CUtexObject src_tex[3], AVFrame *out_frame,
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)
{
ChromakeyCUDAContext *s = ctx->priv;
CudaFunctions *cu = s->hwctx->internal->cuda_dl;
CUdeviceptr dst_devptr[4] = {
(CUdeviceptr)out_frame->data[0], (CUdeviceptr)out_frame->data[1],
(CUdeviceptr)out_frame->data[2], (CUdeviceptr)out_frame->data[3]
};
void *args_uchar[] = {
&src_tex[0], &src_tex[1], &src_tex[2],
&dst_devptr[0], &dst_devptr[1], &dst_devptr[2], &dst_devptr[3],
&width, &height, &pitch,
&width_uv, &height_uv, &pitch_uv,
&u_key, &v_key, &similarity, &blend
};
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,
};
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