lavfi: add an chromaber_vulkan filter

This commit adds a chromatic aberration filter for Vulkan that attempts to
emulate a lens chromatic aberration effect.
For a YUV frame it will instead shift the chroma channels, providing a
simple approximation.

1 files changed, 340 insertions, 0 deletions

diff --git a/libavfilter/vf_chromaber_vulkan.c b/libavfilter/vf_chromaber_vulkan.c
new file mode 100644
index 0000000000..673b3a7a68
--- /dev/null
+++ b/libavfilter/vf_chromaber_vulkan.c
@@ -0,0 +1,340 @@
+/*
+ * 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/opt.h"
+#include "vulkan.h"
+#include "internal.h"
+
+#define CGROUPS (int [3]){ 32, 32, 1 }
+
+typedef struct ChromaticAberrationVulkanContext {
+    VulkanFilterContext vkctx;
+
+    int initialized;
+    FFVkExecContext *exec;
+    VulkanPipeline *pl;
+
+    /* Shader updators, must be in the main filter struct */
+    VkDescriptorImageInfo input_images[3];
+    VkDescriptorImageInfo output_images[3];
+
+    /* Push constants / options */
+    struct {
+        float dist[2];
+    } opts;
+} ChromaticAberrationVulkanContext;
+
+static const char distort_chroma_kernel[] = {
+    C(0, void distort_rgb(ivec2 size, ivec2 pos)                               )
+    C(0, {                                                                     )
+    C(1,     const vec2 p = ((vec2(pos)/vec2(size)) - 0.5f)*2.0f;              )
+    C(1,     const vec2 o = p * (dist - 1.0f);                                 )
+    C(0,                                                                       )
+    C(1,     vec4 res;                                                         )
+    C(1,     res.r = texture(input_img[0], ((p - o)/2.0f) + 0.5f).r;           )
+    C(1,     res.g = texture(input_img[0], ((p    )/2.0f) + 0.5f).g;           )
+    C(1,     res.b = texture(input_img[0], ((p + o)/2.0f) + 0.5f).b;           )
+    C(1,     res.a = texture(input_img[0], ((p    )/2.0f) + 0.5f).a;           )
+    C(1,     imageStore(output_img[0], pos, res);                              )
+    C(0, }                                                                     )
+    C(0,                                                                       )
+    C(0, void distort_chroma(int idx, ivec2 size, ivec2 pos)                   )
+    C(0, {                                                                     )
+    C(1,     vec2 p = ((vec2(pos)/vec2(size)) - 0.5f)*2.0f;                    )
+    C(1,     float d = sqrt(p.x*p.x + p.y*p.y);                                )
+    C(1,     p *= d / (d*     dist);                                           )
+    C(1,     vec4 res = texture(input_img[idx], (p/2.0f) + 0.5f);              )
+    C(1,     imageStore(output_img[idx], pos, res);                            )
+    C(0, }                                                                     )
+};
+
+static av_cold int init_filter(AVFilterContext *ctx, AVFrame *in)
+{
+    int err;
+    ChromaticAberrationVulkanContext *s = ctx->priv;
+
+    /* Create a sampler */
+    VkSampler *sampler = ff_vk_init_sampler(ctx, 0, VK_FILTER_LINEAR);
+    if (!sampler)
+        return AVERROR_EXTERNAL;
+
+    s->pl = ff_vk_create_pipeline(ctx);
+    if (!s->pl)
+        return AVERROR(ENOMEM);
+
+    /* Normalize options */
+    s->opts.dist[0] = (s->opts.dist[0] / 100.0f) + 1.0f;
+    s->opts.dist[1] = (s->opts.dist[1] / 100.0f) + 1.0f;
+
+    { /* Create the shader */
+        const int planes = av_pix_fmt_count_planes(s->vkctx.output_format);
+        VulkanDescriptorSetBinding desc_i[2] = {
+            {
+                .name       = "input_img",
+                .type       = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
+                .dimensions = 2,
+                .elems      = planes,
+                .stages     = VK_SHADER_STAGE_COMPUTE_BIT,
+                .updater    = s->input_images,
+                .samplers   = DUP_SAMPLER_ARRAY4(*sampler),
+            },
+            {
+                .name       = "output_img",
+                .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,
+                .updater    = s->output_images,
+            },
+        };
+
+        SPIRVShader *shd = ff_vk_init_shader(ctx, s->pl, "chromaber_compute",
+                                             VK_SHADER_STAGE_COMPUTE_BIT);
+        if (!shd)
+            return AVERROR(ENOMEM);
+
+        ff_vk_set_compute_shader_sizes(ctx, shd, CGROUPS);
+
+        GLSLC(0, layout(push_constant, std430) uniform pushConstants {        );
+        GLSLC(1,    vec2 dist;                                                );
+        GLSLC(0, };                                                           );
+        GLSLC(0,                                                              );
+
+        ff_vk_add_push_constant(ctx, s->pl, 0, sizeof(s->opts),
+                                VK_SHADER_STAGE_COMPUTE_BIT);
+
+        RET(ff_vk_add_descriptor_set(ctx, s->pl, shd, desc_i, 2, 0)); /* set 0 */
+
+        GLSLD(   distort_chroma_kernel                                        );
+        GLSLC(0, void main()                                                  );
+        GLSLC(0, {                                                            );
+        GLSLC(1,     ivec2 pos = ivec2(gl_GlobalInvocationID.xy);             );
+        if (planes == 1) {
+            GLSLC(1, distort_rgb(imageSize(output_img[0]), pos);              );
+        } else {
+            GLSLC(1, ivec2 size = imageSize(output_img[0]);                   );
+            GLSLC(1, vec2 npos = vec2(pos)/vec2(size);                        );
+            GLSLC(1, vec4 res = texture(input_img[0], npos);                  );
+            GLSLC(1, imageStore(output_img[0], pos, res);                     );
+            for (int i = 1; i < planes; i++) {
+                GLSLC(0,                                                      );
+                GLSLF(1,  size = imageSize(output_img[%i]);                 ,i);
+                GLSLC(1,  if (IS_WITHIN(pos, size)) {                         );
+                GLSLF(2,      distort_chroma(%i, size, pos);                ,i);
+                GLSLC(1,  } else {                                            );
+                GLSLC(2,    npos = vec2(pos)/vec2(size);                      );
+                GLSLF(2,    res = texture(input_img[%i], npos);             ,i);
+                GLSLF(2,    imageStore(output_img[%i], pos, res);           ,i);
+                GLSLC(1, }                                                    );
+            }
+        }
+        GLSLC(0, }                                                            );
+
+        RET(ff_vk_compile_shader(ctx, shd, "main"));
+    }
+
+    RET(ff_vk_init_pipeline_layout(ctx, s->pl));
+    RET(ff_vk_init_compute_pipeline(ctx, s->pl));
+
+    /* Execution context */
+    RET(ff_vk_create_exec_ctx(ctx, &s->exec,
+                              s->vkctx.hwctx->queue_family_comp_index));
+
+    s->initialized = 1;
+
+    return 0;
+
+fail:
+    return err;
+}
+
+static int process_frames(AVFilterContext *avctx, AVFrame *out_f, AVFrame *in_f)
+{
+    int err = 0;
+    ChromaticAberrationVulkanContext *s = avctx->priv;
+    AVVkFrame *in = (AVVkFrame *)in_f->data[0];
+    AVVkFrame *out = (AVVkFrame *)out_f->data[0];
+    int planes = av_pix_fmt_count_planes(s->vkctx.output_format);
+
+    for (int i = 0; i < planes; i++) {
+        RET(ff_vk_create_imageview(avctx, &s->input_images[i].imageView, in->img[i],
+                                   av_vkfmt_from_pixfmt(s->vkctx.input_format)[i],
+                                   ff_comp_identity_map));
+
+        RET(ff_vk_create_imageview(avctx, &s->output_images[i].imageView, out->img[i],
+                                   av_vkfmt_from_pixfmt(s->vkctx.output_format)[i],
+                                   ff_comp_identity_map));
+
+        s->input_images[i].imageLayout  = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
+        s->output_images[i].imageLayout = VK_IMAGE_LAYOUT_GENERAL;
+    }
+
+    ff_vk_update_descriptor_set(avctx, s->pl, 0);
+
+    ff_vk_start_exec_recording(avctx, s->exec);
+
+    for (int i = 0; i < planes; i++) {
+        VkImageMemoryBarrier bar[2] = {
+            {
+                .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,
+                .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,
+            },
+        };
+
+        vkCmdPipelineBarrier(s->exec->buf, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
+                             VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, 0,
+                             0, NULL, 0, NULL, FF_ARRAY_ELEMS(bar), bar);
+
+        in->layout[i]  = bar[0].newLayout;
+        in->access[i]  = bar[0].dstAccessMask;
+
+        out->layout[i] = bar[1].newLayout;
+        out->access[i] = bar[1].dstAccessMask;
+    }
+
+    ff_vk_bind_pipeline_exec(avctx, s->exec, s->pl);
+
+    ff_vk_update_push_exec(avctx, s->exec, VK_SHADER_STAGE_COMPUTE_BIT,
+                           0, sizeof(s->opts), &s->opts);
+
+    vkCmdDispatch(s->exec->buf,
+                  FFALIGN(s->vkctx.output_width,  CGROUPS[0])/CGROUPS[0],
+                  FFALIGN(s->vkctx.output_height, CGROUPS[1])/CGROUPS[1], 1);
+
+    ff_vk_add_exec_dep(avctx, s->exec, in_f, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT);
+    ff_vk_add_exec_dep(avctx, s->exec, out_f, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT);
+
+    err = ff_vk_submit_exec_queue(avctx, s->exec);
+    if (err)
+        return err;
+
+    for (int i = 0; i < planes; i++) {
+        ff_vk_destroy_imageview(avctx, &s->input_images[i].imageView);
+        ff_vk_destroy_imageview(avctx, &s->output_images[i].imageView);
+    }
+
+fail:
+    return err;
+}
+
+static int chromaber_vulkan_filter_frame(AVFilterLink *link, AVFrame *in)
+{
+    int err;
+    AVFilterContext *ctx = link->dst;
+    ChromaticAberrationVulkanContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+
+    AVFrame *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));
+
+    RET(process_frames(ctx, out, in));
+
+    err = av_frame_copy_props(out, in);
+    if (err < 0)
+        goto fail;
+
+    av_frame_free(&in);
+
+    return ff_filter_frame(outlink, out);
+
+fail:
+    av_frame_free(&in);
+    av_frame_free(&out);
+    return err;
+}
+
+static void chromaber_vulkan_uninit(AVFilterContext *avctx)
+{
+    ChromaticAberrationVulkanContext *s = avctx->priv;
+
+    ff_vk_filter_uninit(avctx);
+
+    s->initialized = 0;
+}
+
+#define OFFSET(x) offsetof(ChromaticAberrationVulkanContext, x)
+#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
+static const AVOption chromaber_vulkan_options[] = {
+    { "dist_x", "Set horizontal distortion amount", OFFSET(opts.dist[0]), AV_OPT_TYPE_FLOAT, {.dbl = 0.0f}, -10.0f, 10.0f, .flags = FLAGS },
+    { "dist_y", "Set vertical distortion amount",   OFFSET(opts.dist[1]), AV_OPT_TYPE_FLOAT, {.dbl = 0.0f}, -10.0f, 10.0f, .flags = FLAGS },
+    { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(chromaber_vulkan);
+
+static const AVFilterPad chromaber_vulkan_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = &chromaber_vulkan_filter_frame,
+        .config_props = &ff_vk_filter_config_input,
+    },
+    { NULL }
+};
+
+static const AVFilterPad chromaber_vulkan_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+        .config_props = &ff_vk_filter_config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_chromaber_vulkan = {
+    .name           = "chromaber_vulkan",
+    .description    = NULL_IF_CONFIG_SMALL("Offset chroma of input video (chromatic aberration)"),
+    .priv_size      = sizeof(ChromaticAberrationVulkanContext),
+    .init           = &ff_vk_filter_init,
+    .uninit         = &chromaber_vulkan_uninit,
+    .query_formats  = &ff_vk_filter_query_formats,
+    .inputs         = chromaber_vulkan_inputs,
+    .outputs        = chromaber_vulkan_outputs,
+    .priv_class     = &chromaber_vulkan_class,
+    .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
+};