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/*
* copyright (c) 2021-2022 Wu Jianhua <[email protected]>
* Copyright (c) Lynne
*
* 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 "vulkan_spirv.h"
#include "internal.h"
#include "video.h"
#define CGS 32
#define GBLUR_MAX_KERNEL_SIZE 127
typedef struct GBlurVulkanContext {
FFVulkanContext vkctx;
int initialized;
FFVkExecPool e;
FFVkQueueFamilyCtx qf;
VkSampler sampler;
FFVulkanPipeline pl_hor;
FFVkSPIRVShader shd_hor;
FFVkBuffer params_hor;
FFVulkanPipeline pl_ver;
FFVkSPIRVShader shd_ver;
FFVkBuffer params_ver;
int size;
int sizeV;
int planes;
float sigma;
float sigmaV;
} 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);
}
static int init_gblur_pipeline(GBlurVulkanContext *s, FFVulkanPipeline *pl,
FFVkSPIRVShader *shd, FFVkBuffer *params_buf,
int ksize, float sigma, FFVkSPIRVCompiler *spv)
{
int err = 0;
uint8_t *kernel_mapped;
uint8_t *spv_data;
size_t spv_len;
void *spv_opaque = NULL;
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,
.buf_content = NULL,
};
char *kernel_def = av_asprintf("float kernel[%i];", ksize);
if (!kernel_def)
return AVERROR(ENOMEM);
buf_desc.buf_content = kernel_def;
RET(ff_vk_pipeline_descriptor_set_add(&s->vkctx, pl, shd, &buf_desc, 1, 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)) );
GLSLC(2, return; );
if (s->planes & (1 << i)) {
GLSLF(1, gblur(pos, %i); ,i);
} else {
GLSLF(1, vec4 res = texture(input_images[%i], pos); ,i);
GLSLF(1, imageStore(output_images[%i], pos, res); ,i);
}
}
GLSLC(0, } );
RET(spv->compile_shader(spv, s, shd, &spv_data, &spv_len, "main",
&spv_opaque));
RET(ff_vk_shader_create(&s->vkctx, shd, spv_data, spv_len, "main"));
RET(ff_vk_init_compute_pipeline(&s->vkctx, pl, shd));
RET(ff_vk_exec_pipeline_register(&s->vkctx, &s->e, pl));
RET(ff_vk_create_buf(&s->vkctx, params_buf, sizeof(float) * ksize, NULL, NULL,
VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT |
VK_BUFFER_USAGE_STORAGE_BUFFER_BIT,
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT));
RET(ff_vk_map_buffer(&s->vkctx, params_buf, &kernel_mapped, 0));
init_gaussian_kernel((float *)kernel_mapped, sigma, ksize);
RET(ff_vk_unmap_buffer(&s->vkctx, params_buf, 1));
RET(ff_vk_set_descriptor_buffer(&s->vkctx, pl, NULL, 1, 0, 0,
params_buf->address, params_buf->size,
VK_FORMAT_UNDEFINED));
fail:
av_free(kernel_def);
if (spv_opaque)
spv->free_shader(spv, &spv_opaque);
return err;
}
static av_cold int init_filter(AVFilterContext *ctx, AVFrame *in)
{
int err = 0;
GBlurVulkanContext *s = ctx->priv;
FFVulkanContext *vkctx = &s->vkctx;
const int planes = av_pix_fmt_count_planes(s->vkctx.output_format);
FFVkSPIRVShader *shd;
FFVkSPIRVCompiler *spv;
FFVulkanDescriptorSetBinding *desc;
spv = ff_vk_spirv_init();
if (!spv) {
av_log(ctx, AV_LOG_ERROR, "Unable to initialize SPIR-V compiler!\n");
return AVERROR_EXTERNAL;
}
ff_vk_qf_init(vkctx, &s->qf, VK_QUEUE_COMPUTE_BIT);
RET(ff_vk_exec_pool_init(vkctx, &s->qf, &s->e, s->qf.nb_queues*4, 0, 0, 0, NULL));
RET(ff_vk_init_sampler(vkctx, &s->sampler, 1, VK_FILTER_LINEAR));
RET(ff_vk_shader_init(&s->pl_hor, &s->shd_hor, "gblur_hor_compute",
VK_SHADER_STAGE_COMPUTE_BIT, 0));
RET(ff_vk_shader_init(&s->pl_ver, &s->shd_ver, "gblur_ver_compute",
VK_SHADER_STAGE_COMPUTE_BIT, 0));
desc = (FFVulkanDescriptorSetBinding []) {
{
.name = "input_images",
.type = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
.dimensions = 2,
.elems = planes,
.stages = VK_SHADER_STAGE_COMPUTE_BIT,
.samplers = DUP_SAMPLER(s->sampler),
},
{
.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,
},
};
init_gaussian_params(s);
{
shd = &s->shd_hor;
ff_vk_shader_set_compute_sizes(shd, 32, 1, 1);
RET(ff_vk_pipeline_descriptor_set_add(vkctx, &s->pl_hor, shd, desc, 2, 0, 0));
GLSLC(0, #define OFFSET (vec2(i, 0.0)));
RET(init_gblur_pipeline(s, &s->pl_hor, shd, &s->params_hor, s->size, s->sigma, spv));
}
{
shd = &s->shd_ver;
ff_vk_shader_set_compute_sizes(shd, 1, 32, 1);
RET(ff_vk_pipeline_descriptor_set_add(vkctx, &s->pl_ver, shd, desc, 2, 0, 0));
GLSLC(0, #define OFFSET (vec2(0.0, i)));
RET(init_gblur_pipeline(s, &s->pl_ver, shd, &s->params_ver, s->sizeV, s->sigmaV, spv));
}
s->initialized = 1;
fail:
if (spv)
spv->uninit(&spv);
return err;
}
static av_cold void gblur_vulkan_uninit(AVFilterContext *avctx)
{
GBlurVulkanContext *s = avctx->priv;
FFVulkanContext *vkctx = &s->vkctx;
FFVulkanFunctions *vk = &vkctx->vkfn;
ff_vk_exec_pool_free(vkctx, &s->e);
ff_vk_pipeline_free(vkctx, &s->pl_hor);
ff_vk_pipeline_free(vkctx, &s->pl_ver);
ff_vk_shader_free(vkctx, &s->shd_hor);
ff_vk_shader_free(vkctx, &s->shd_ver);
ff_vk_free_buf(vkctx, &s->params_hor);
ff_vk_free_buf(vkctx, &s->params_ver);
if (s->sampler)
vk->DestroySampler(vkctx->hwctx->act_dev, s->sampler,
vkctx->hwctx->alloc);
ff_vk_uninit(&s->vkctx);
s->initialized = 0;
}
static int gblur_vulkan_filter_frame(AVFilterLink *link, AVFrame *in)
{
int err;
AVFrame *tmp = NULL, *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;
}
tmp = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!tmp) {
err = AVERROR(ENOMEM);
goto fail;
}
if (!s->initialized)
RET(init_filter(ctx, in));
RET(ff_vk_filter_process_2pass(&s->vkctx, &s->e,
(FFVulkanPipeline *[2]){ &s->pl_hor, &s->pl_ver },
out, tmp, in, s->sampler, NULL, 0));
err = av_frame_copy_props(out, in);
if (err < 0)
goto fail;
av_frame_free(&in);
av_frame_free(&tmp);
return ff_filter_frame(outlink, out);
fail:
av_frame_free(&in);
av_frame_free(&tmp);
av_frame_free(&out);
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,
.flags = AVFILTER_FLAG_HWDEVICE,
};
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