/*
* copyright (c) 2021-2022 Wu Jianhua <jianhua.wu@intel.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 "libavutil/random_seed.h"
#include "libavutil/opt.h"
#include "vulkan_filter.h"
#include "internal.h"
#define CGS 32
#define GBLUR_MAX_KERNEL_SIZE 127
typedef struct GBlurVulkanContext {
FFVulkanContext vkctx;
FFVkQueueFamilyCtx qf;
FFVkExecContext *exec;
FFVulkanPipeline *pl_hor;
FFVulkanPipeline *pl_ver;
FFVkBuffer params_buf_hor;
FFVkBuffer params_buf_ver;
VkDescriptorImageInfo input_images[3];
VkDescriptorImageInfo tmp_images[3];
VkDescriptorImageInfo output_images[3];
VkDescriptorBufferInfo params_desc_hor;
VkDescriptorBufferInfo params_desc_ver;
int initialized;
int size;
int sizeV;
int planes;
float sigma;
float sigmaV;
AVFrame *tmpframe;
} GBlurVulkanContext;
static const char gblur_func[] = {
C(0, void gblur(const ivec2 pos, const int index) )
C(0, { )
C(1, vec4 sum = texture(input_images[index], pos) * kernel[0]; )
C(0, )
C(1, for(int i = 1; i < kernel.length(); i++) { )
C(2, sum += texture(input_images[index], pos + OFFSET) * kernel[i]; )
C(2, sum += texture(input_images[index], pos - OFFSET) * kernel[i]; )
C(1, } )
C(0, )
C(1, imageStore(output_images[index], pos, sum); )
C(0, } )
};
static inline float gaussian(float sigma, float x)
{
return 1.0 / (sqrt(2.0 * M_PI) * sigma) *
exp(-(x * x) / (2.0 * sigma * sigma));
}
static inline float gaussian_simpson_integration(float sigma, float a, float b)
{
return (b - a) * (1.0 / 6.0) * ((gaussian(sigma, a) +
4.0 * gaussian(sigma, (a + b) * 0.5) + gaussian(sigma, b)));
}
static void init_gaussian_kernel(float *kernel, float sigma, float kernel_size)
{
int x;
float sum;
sum = 0;
for (x = 0; x < kernel_size; x++) {
kernel[x] = gaussian_simpson_integration(sigma, x - 0.5f, x + 0.5f);
if (!x)
sum += kernel[x];
else
sum += kernel[x] * 2.0;
}
/* Normalized */
sum = 1.0 / sum;
for (x = 0; x < kernel_size; x++) {
kernel[x] *= sum;
}
}
static inline void init_kernel_size(GBlurVulkanContext *s, int *out_size)
{
int size = *out_size;
if (!(size & 1)) {
av_log(s, AV_LOG_WARNING, "The kernel size should be odd\n");
size++;
}
*out_size = (size >> 1) + 1;
}
static av_cold void init_gaussian_params(GBlurVulkanContext *s)
{
if (s->sigmaV <= 0)
s->sigmaV = s->sigma;
init_kernel_size(s, &s->size);
if (s->sizeV <= 0)
s->sizeV = s->size;
else
init_kernel_size(s, &s->sizeV);
s->tmpframe = NULL;
}
static int init_gblur_pipeline(GBlurVulkanContext *s, FFVulkanPipeline *pl, FFVkSPIRVShader *shd,
FFVkBuffer *params_buf, VkDescriptorBufferInfo *params_desc,
int ksize, float sigma)
{
int err = 0;
uint8_t *kernel_mapped;
const int planes = av_pix_fmt_count_planes(s->vkctx.output_format);
FFVulkanDescriptorSetBinding buf_desc = {
.name = "data",
.type = VK_DESCRIPTOR_TYPE_STORAGE_BUFFER,
.mem_quali = "readonly",
.mem_layout = "std430",
.stages = VK_SHADER_STAGE_COMPUTE_BIT,
.updater = NULL,
.buf_content = NULL,
};
char *kernel_def = av_asprintf("float kernel[%i];", ksize);
if (!kernel_def)
return AVERROR(ENOMEM);
buf_desc.updater = params_desc;
buf_desc.buf_content = kernel_def;
RET(ff_vk_add_descriptor_set(&s->vkctx, pl, shd, &buf_desc, 1, 0));
GLSLD( gblur_func );
GLSLC(0, void main() );
GLSLC(0, { );
GLSLC(1, ivec2 size; );
GLSLC(1, const ivec2 pos = ivec2(gl_GlobalInvocationID.xy); );
for (int i = 0; i < planes; i++) {
GLSLC(0, );
GLSLF(1, size = imageSize(output_images[%i]); ,i);
GLSLC(1, if (IS_WITHIN(pos, size)) { );
if (s->planes & (1 << i)) {
GLSLF(2, gblur(pos, %i); ,i);
} else {
GLSLF(2, vec4 res = texture(input_images[%i], pos); ,i);
GLSLF(2, imageStore(output_images[%i], pos, res); ,i);
}
GLSLC(1, } );
}
GLSLC(0, } );
RET(ff_vk_compile_shader(&s->vkctx, shd, "main"));
RET(ff_vk_init_pipeline_layout(&s->vkctx, pl));
RET(ff_vk_init_compute_pipeline(&s->vkctx, pl));
RET(ff_vk_create_buf(&s->vkctx, params_buf, sizeof(float) * ksize,
VK_BUFFER_USAGE_STORAGE_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT));
RET(ff_vk_map_buffers(&s->vkctx, params_buf, &kernel_mapped, 1, 0));
init_gaussian_kernel((float *)kernel_mapped, sigma, ksize);
RET(ff_vk_unmap_buffers(&s->vkctx, params_buf, 1, 1));
params_desc->buffer = params_buf->buf;
params_desc->range = VK_WHOLE_SIZE;
ff_vk_update_descriptor_set(&s->vkctx, pl, 1);
fail:
av_free(kernel_def);
return err;
}
static av_cold int init_filter(AVFilterContext *ctx, AVFrame *in)
{
int err = 0;
GBlurVulkanContext *s = ctx->priv;
FFVkSPIRVShader *shd;
const int planes = av_pix_fmt_count_planes(s->vkctx.output_format);
FFVulkanDescriptorSetBinding image_descs[] = {
{
.name = "input_images",
.type = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
.dimensions = 2,
.elems = planes,
.stages = VK_SHADER_STAGE_COMPUTE_BIT,
},
{
.name = "output_images",
.type = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE,
.mem_layout = ff_vk_shader_rep_fmt(s->vkctx.output_format),
.mem_quali = "writeonly",
.dimensions = 2,
.elems = planes,
.stages = VK_SHADER_STAGE_COMPUTE_BIT,
},
};
image_descs[0].sampler = ff_vk_init_sampler(&s->vkctx, 1, VK_FILTER_LINEAR);
if (!image_descs[0].sampler)
return AVERROR_EXTERNAL;
init_gaussian_params(s);
ff_vk_qf_init(&s->vkctx, &s->qf, VK_QUEUE_COMPUTE_BIT, 0);
{
/* Create shader for the horizontal pass */
image_descs[0].updater = s->input_images;
image_descs[1].updater = s->tmp_images;
s->pl_hor = ff_vk_create_pipeline(&s->vkctx, &s->qf);
if (!s->pl_hor) {
err = AVERROR(ENOMEM);
goto fail;
}
shd = ff_vk_init_shader(s->pl_hor, "gblur_compute_hor", image_descs[0].stages);
if (!shd) {
err = AVERROR(ENOMEM);
goto fail;
}
ff_vk_set_compute_shader_sizes(shd, (int [3]){ CGS, 1, 1 });
RET(ff_vk_add_descriptor_set(&s->vkctx, s->pl_hor, shd, image_descs, FF_ARRAY_ELEMS(image_descs), 0));
GLSLC(0, #define OFFSET (vec2(i, 0.0)));
RET(init_gblur_pipeline(s, s->pl_hor, shd, &s->params_buf_hor, &s->params_desc_hor,
s->size, s->sigma));
}
{
/* Create shader for the vertical pass */
image_descs[0].updater = s->tmp_images;
image_descs[1].updater = s->output_images;
s->pl_ver = ff_vk_create_pipeline(&s->vkctx, &s->qf);
if (!s->pl_ver) {
err = AVERROR(ENOMEM);
goto fail;
}
shd = ff_vk_init_shader(s->pl_ver, "gblur_compute_ver", image_descs[0].stages);
if (!shd) {
err = AVERROR(ENOMEM);
goto fail;
}
ff_vk_set_compute_shader_sizes(shd, (int [3]){ 1, CGS, 1 });
RET(ff_vk_add_descriptor_set(&s->vkctx, s->pl_ver, shd, image_descs, FF_ARRAY_ELEMS(image_descs), 0));
GLSLC(0, #define OFFSET (vec2(0.0, i)));
RET(init_gblur_pipeline(s, s->pl_ver, shd, &s->params_buf_ver, &s->params_desc_ver,
s->sizeV, s->sigmaV));
}
RET(ff_vk_create_exec_ctx(&s->vkctx, &s->exec, &s->qf));
s->initialized = 1;
fail:
return err;
}
static av_cold void gblur_vulkan_uninit(AVFilterContext *avctx)
{
GBlurVulkanContext *s = avctx->priv;
av_frame_free(&s->tmpframe);
ff_vk_free_buf(&s->vkctx, &s->params_buf_hor);
ff_vk_free_buf(&s->vkctx, &s->params_buf_ver);
ff_vk_uninit(&s->vkctx);
s->initialized = 0;
}
static int process_frames(AVFilterContext *avctx, AVFrame *outframe, AVFrame *inframe)
{
int err;
VkCommandBuffer cmd_buf;
GBlurVulkanContext *s = avctx->priv;
FFVulkanFunctions *vk = &s->vkctx.vkfn;
const int planes = av_pix_fmt_count_planes(s->vkctx.output_format);
AVVkFrame *in = (AVVkFrame *)inframe->data[0];
AVVkFrame *out = (AVVkFrame *)outframe->data[0];
AVVkFrame *tmp = (AVVkFrame *)s->tmpframe->data[0];
const VkFormat *input_formats = av_vkfmt_from_pixfmt(s->vkctx.input_format);
const VkFormat *output_formats = av_vkfmt_from_pixfmt(s->vkctx.output_format);
ff_vk_start_exec_recording(&s->vkctx, s->exec);
cmd_buf = ff_vk_get_exec_buf(s->exec);
for (int i = 0; i < planes; i++) {
RET(ff_vk_create_imageview(&s->vkctx, s->exec, &s->input_images[i].imageView,
in->img[i],
input_formats[i],
ff_comp_identity_map));
RET(ff_vk_create_imageview(&s->vkctx, s->exec, &s->tmp_images[i].imageView,
tmp->img[i],
output_formats[i],
ff_comp_identity_map));
RET(ff_vk_create_imageview(&s->vkctx, s->exec, &s->output_images[i].imageView,
out->img[i],
output_formats[i],
ff_comp_identity_map));
s->input_images[i].imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
s->tmp_images[i].imageLayout = VK_IMAGE_LAYOUT_GENERAL;
s->output_images[i].imageLayout = VK_IMAGE_LAYOUT_GENERAL;
}
ff_vk_update_descriptor_set(&s->vkctx, s->pl_hor, 0);
ff_vk_update_descriptor_set(&s->vkctx, s->pl_ver, 0);
for (int i = 0; i < planes; i++) {
VkImageMemoryBarrier barriers[] = {
{
.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
.srcAccessMask = 0,
.dstAccessMask = VK_ACCESS_SHADER_READ_BIT,
.oldLayout = in->layout[i],
.newLayout = s->input_images[i].imageLayout,
.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.image = in->img[i],
.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
.subresourceRange.levelCount = 1,
.subresourceRange.layerCount = 1,
},
{
.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
.srcAccessMask = 0,
.dstAccessMask = VK_ACCESS_SHADER_WRITE_BIT | VK_ACCESS_SHADER_READ_BIT,
.oldLayout = tmp->layout[i],
.newLayout = s->tmp_images[i].imageLayout,
.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.image = tmp->img[i],
.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
.subresourceRange.levelCount = 1,
.subresourceRange.layerCount = 1,
},
{
.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
.srcAccessMask = 0,
.dstAccessMask = VK_ACCESS_SHADER_WRITE_BIT,
.oldLayout = out->layout[i],
.newLayout = s->output_images[i].imageLayout,
.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
.image = out->img[i],
.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
.subresourceRange.levelCount = 1,
.subresourceRange.layerCount = 1,
},
};
vk->CmdPipelineBarrier(cmd_buf, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, 0,
0, NULL, 0, NULL, FF_ARRAY_ELEMS(barriers), barriers);
in->layout[i] = barriers[0].newLayout;
in->access[i] = barriers[0].dstAccessMask;
tmp->layout[i] = barriers[1].newLayout;
tmp->access[i] = barriers[1].dstAccessMask;
out->layout[i] = barriers[2].newLayout;
out->access[i] = barriers[2].dstAccessMask;
}
ff_vk_bind_pipeline_exec(&s->vkctx, s->exec, s->pl_hor);
vk->CmdDispatch(cmd_buf, FFALIGN(s->vkctx.output_width, CGS)/CGS,
s->vkctx.output_height, 1);
ff_vk_bind_pipeline_exec(&s->vkctx, s->exec, s->pl_ver);
vk->CmdDispatch(cmd_buf,s->vkctx.output_width,
FFALIGN(s->vkctx.output_height, CGS)/CGS, 1);
ff_vk_add_exec_dep(&s->vkctx, s->exec, inframe, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT);
ff_vk_add_exec_dep(&s->vkctx, s->exec, outframe, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT);
err = ff_vk_submit_exec_queue(&s->vkctx, s->exec);
if (err)
return err;
ff_vk_qf_rotate(&s->qf);
return 0;
fail:
ff_vk_discard_exec_deps(s->exec);
return err;
}
static int gblur_vulkan_filter_frame(AVFilterLink *link, AVFrame *in)
{
int err;
AVFrame *out = NULL;
AVFilterContext *ctx = link->dst;
GBlurVulkanContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
err = AVERROR(ENOMEM);
goto fail;
}
if (!s->initialized) {
RET(init_filter(ctx, in));
s->tmpframe = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!s->tmpframe) {
err = AVERROR(ENOMEM);
goto fail;
}
}
RET(process_frames(ctx, out, in));
RET(av_frame_copy_props(out, in));
av_frame_free(&in);
return ff_filter_frame(outlink, out);
fail:
av_frame_free(&in);
av_frame_free(&out);
av_frame_free(&s->tmpframe);
return err;
}
#define OFFSET(x) offsetof(GBlurVulkanContext, x)
#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
static const AVOption gblur_vulkan_options[] = {
{ "sigma", "Set sigma", OFFSET(sigma), AV_OPT_TYPE_FLOAT, { .dbl = 0.5 }, 0.01, 1024.0, FLAGS },
{ "sigmaV", "Set vertical sigma", OFFSET(sigmaV), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0.0, 1024.0, FLAGS },
{ "planes", "Set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, { .i64 = 0xF }, 0, 0xF, FLAGS },
{ "size", "Set kernel size", OFFSET(size), AV_OPT_TYPE_INT, { .i64 = 19 }, 1, GBLUR_MAX_KERNEL_SIZE, FLAGS },
{ "sizeV", "Set vertical kernel size", OFFSET(sizeV), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, GBLUR_MAX_KERNEL_SIZE, FLAGS },
{ NULL },
};
AVFILTER_DEFINE_CLASS(gblur_vulkan);
static const AVFilterPad gblur_vulkan_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = &gblur_vulkan_filter_frame,
.config_props = &ff_vk_filter_config_input,
}
};
static const AVFilterPad gblur_vulkan_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = &ff_vk_filter_config_output,
}
};
const AVFilter ff_vf_gblur_vulkan = {
.name = "gblur_vulkan",
.description = NULL_IF_CONFIG_SMALL("Gaussian Blur in Vulkan"),
.priv_size = sizeof(GBlurVulkanContext),
.init = &ff_vk_filter_init,
.uninit = &gblur_vulkan_uninit,
FILTER_INPUTS(gblur_vulkan_inputs),
FILTER_OUTPUTS(gblur_vulkan_outputs),
FILTER_SINGLE_PIXFMT(AV_PIX_FMT_VULKAN),
.priv_class = &gblur_vulkan_class,
.flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
};