mirror of https://git.ffmpeg.org/ffmpeg.git
245 lines
7.9 KiB
C
245 lines
7.9 KiB
C
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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 "libavutil/opt.h"
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#include "libavutil/imgutils.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 "opencl.h"
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#include "opencl_source.h"
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#include "video.h"
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typedef struct ColorkeyOpenCLContext {
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OpenCLFilterContext ocf;
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// Whether or not the above `OpenCLFilterContext` has been initialized
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int initialized;
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cl_command_queue command_queue;
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cl_kernel kernel_colorkey;
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// The color we are supposed to replace with transparency
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uint8_t colorkey_rgba[4];
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// Stored as a normalized float for passing to the OpenCL kernel
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cl_float4 colorkey_rgba_float;
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// Similarity percentage compared to `colorkey_rgba`, ranging from `0.01` to `1.0`
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// where `0.01` matches only the key color and `1.0` matches all colors
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float similarity;
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// Blending percentage where `0.0` results in fully transparent pixels, `1.0` results
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// in fully opaque pixels, and numbers in between result in transparency that varies
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// based on the similarity to the key color
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float blend;
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} ColorkeyOpenCLContext;
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static int colorkey_opencl_init(AVFilterContext *avctx)
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{
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ColorkeyOpenCLContext *ctx = avctx->priv;
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cl_int cle;
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int err;
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err = ff_opencl_filter_load_program(avctx, &ff_opencl_source_colorkey, 1);
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if (err < 0)
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goto fail;
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ctx->command_queue = clCreateCommandQueue(
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ctx->ocf.hwctx->context,
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ctx->ocf.hwctx->device_id,
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0,
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&cle
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);
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CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create OpenCL command queue %d.\n", cle);
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if (ctx->blend > 0.0001) {
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ctx->kernel_colorkey = clCreateKernel(ctx->ocf.program, "colorkey_blend", &cle);
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CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create colorkey_blend kernel: %d.\n", cle);
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} else {
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ctx->kernel_colorkey = clCreateKernel(ctx->ocf.program, "colorkey", &cle);
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CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to create colorkey kernel: %d.\n", cle);
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}
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for (int i = 0; i < 4; ++i) {
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ctx->colorkey_rgba_float.s[i] = (float)ctx->colorkey_rgba[i] / 255.0;
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}
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ctx->initialized = 1;
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return 0;
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fail:
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if (ctx->command_queue)
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clReleaseCommandQueue(ctx->command_queue);
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if (ctx->kernel_colorkey)
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clReleaseKernel(ctx->kernel_colorkey);
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return err;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *input_frame)
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{
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AVFilterContext *avctx = link->dst;
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AVFilterLink *outlink = avctx->outputs[0];
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ColorkeyOpenCLContext *colorkey_ctx = avctx->priv;
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AVFrame *output_frame = NULL;
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int err;
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cl_int cle;
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size_t global_work[2];
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cl_mem src, dst;
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if (!input_frame->hw_frames_ctx)
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return AVERROR(EINVAL);
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if (!colorkey_ctx->initialized) {
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AVHWFramesContext *input_frames_ctx =
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(AVHWFramesContext*)input_frame->hw_frames_ctx->data;
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int fmt = input_frames_ctx->sw_format;
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// Make sure the input is a format we support
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if (fmt != AV_PIX_FMT_ARGB &&
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fmt != AV_PIX_FMT_RGBA &&
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fmt != AV_PIX_FMT_ABGR &&
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fmt != AV_PIX_FMT_BGRA
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) {
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av_log(avctx, AV_LOG_ERROR, "unsupported (non-RGB) format in colorkey_opencl.\n");
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err = AVERROR(ENOSYS);
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goto fail;
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}
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err = colorkey_opencl_init(avctx);
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if (err < 0)
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goto fail;
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}
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// This filter only operates on RGB data and we know that will be on the first plane
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src = (cl_mem)input_frame->data[0];
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output_frame = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!output_frame) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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dst = (cl_mem)output_frame->data[0];
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CL_SET_KERNEL_ARG(colorkey_ctx->kernel_colorkey, 0, cl_mem, &src);
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CL_SET_KERNEL_ARG(colorkey_ctx->kernel_colorkey, 1, cl_mem, &dst);
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CL_SET_KERNEL_ARG(colorkey_ctx->kernel_colorkey, 2, cl_float4, &colorkey_ctx->colorkey_rgba_float);
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CL_SET_KERNEL_ARG(colorkey_ctx->kernel_colorkey, 3, float, &colorkey_ctx->similarity);
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if (colorkey_ctx->blend > 0.0001) {
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CL_SET_KERNEL_ARG(colorkey_ctx->kernel_colorkey, 4, float, &colorkey_ctx->blend);
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}
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err = ff_opencl_filter_work_size_from_image(avctx, global_work, input_frame, 0, 0);
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if (err < 0)
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goto fail;
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cle = clEnqueueNDRangeKernel(
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colorkey_ctx->command_queue,
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colorkey_ctx->kernel_colorkey,
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2,
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NULL,
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global_work,
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NULL,
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0,
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NULL,
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NULL
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);
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CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to enqueue colorkey kernel: %d.\n", cle);
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// Run queued kernel
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cle = clFinish(colorkey_ctx->command_queue);
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CL_FAIL_ON_ERROR(AVERROR(EIO), "Failed to finish command queue: %d.\n", cle);
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err = av_frame_copy_props(output_frame, input_frame);
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if (err < 0)
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goto fail;
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av_frame_free(&input_frame);
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return ff_filter_frame(outlink, output_frame);
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fail:
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clFinish(colorkey_ctx->command_queue);
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av_frame_free(&input_frame);
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av_frame_free(&output_frame);
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return err;
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}
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static av_cold void colorkey_opencl_uninit(AVFilterContext *avctx)
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{
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ColorkeyOpenCLContext *ctx = avctx->priv;
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cl_int cle;
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if (ctx->kernel_colorkey) {
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cle = clReleaseKernel(ctx->kernel_colorkey);
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if (cle != CL_SUCCESS)
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av_log(avctx, AV_LOG_ERROR, "Failed to release "
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"kernel: %d.\n", cle);
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}
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if (ctx->command_queue) {
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cle = clReleaseCommandQueue(ctx->command_queue);
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if (cle != CL_SUCCESS)
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av_log(avctx, AV_LOG_ERROR, "Failed to release "
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"command queue: %d.\n", cle);
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}
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ff_opencl_filter_uninit(avctx);
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}
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static const AVFilterPad colorkey_opencl_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = &ff_opencl_filter_config_input,
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},
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{ NULL }
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};
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static const AVFilterPad colorkey_opencl_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = &ff_opencl_filter_config_output,
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},
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{ NULL }
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};
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#define OFFSET(x) offsetof(ColorkeyOpenCLContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption colorkey_opencl_options[] = {
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{ "color", "set the colorkey key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "similarity", "set the colorkey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
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{ "blend", "set the colorkey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(colorkey_opencl);
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AVFilter ff_vf_colorkey_opencl = {
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.name = "colorkey_opencl",
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.description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on RGB colors."),
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.priv_size = sizeof(ColorkeyOpenCLContext),
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.priv_class = &colorkey_opencl_class,
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.init = &ff_opencl_filter_init,
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.uninit = &colorkey_opencl_uninit,
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.query_formats = &ff_opencl_filter_query_formats,
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.inputs = colorkey_opencl_inputs,
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.outputs = colorkey_opencl_outputs,
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.flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE
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};
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