/* * Copyright 2025 (c) Niklas Haas * * 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/avassert.h" #include "libavutil/vulkan_spirv.h" #include "libavutil/opt.h" #include "libavutil/timestamp.h" #include "vulkan_filter.h" #include "filters.h" typedef struct SceneDetectVulkanContext { FFVulkanContext vkctx; int initialized; FFVkExecPool e; AVVulkanDeviceQueueFamily *qf; FFVulkanShader shd; AVBufferPool *det_buf_pool; double threshold; int sc_pass; int nb_planes; double prev_mafd; AVFrame *prev; AVFrame *cur; } SceneDetectVulkanContext; typedef struct SceneDetectBuf { #define SLICES 16 uint32_t plane_sad[4][SLICES]; } SceneDetectBuf; static av_cold int init_filter(AVFilterContext *ctx) { int err; uint8_t *spv_data; size_t spv_len; void *spv_opaque = NULL; SceneDetectVulkanContext *s = ctx->priv; FFVulkanContext *vkctx = &s->vkctx; FFVulkanShader *shd; FFVkSPIRVCompiler *spv; FFVulkanDescriptorSetBinding *desc; const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(s->vkctx.input_format); const int lumaonly = !(pixdesc->flags & AV_PIX_FMT_FLAG_RGB) && (pixdesc->flags & AV_PIX_FMT_FLAG_PLANAR); s->nb_planes = lumaonly ? 1 : av_pix_fmt_count_planes(s->vkctx.input_format); spv = ff_vk_spirv_init(); if (!spv) { av_log(ctx, AV_LOG_ERROR, "Unable to initialize SPIR-V compiler!\n"); return AVERROR_EXTERNAL; } s->qf = ff_vk_qf_find(vkctx, VK_QUEUE_COMPUTE_BIT, 0); if (!s->qf) { av_log(ctx, AV_LOG_ERROR, "Device has no compute queues\n"); err = AVERROR(ENOTSUP); goto fail; } RET(ff_vk_exec_pool_init(vkctx, s->qf, &s->e, s->qf->num*4, 0, 0, 0, NULL)); RET(ff_vk_shader_init(vkctx, &s->shd, "scdet", VK_SHADER_STAGE_COMPUTE_BIT, (const char *[]) { "GL_KHR_shader_subgroup_arithmetic" }, 1, 32, 32, 1, 0)); shd = &s->shd; desc = (FFVulkanDescriptorSetBinding []) { { .name = "prev_img", .type = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, .mem_layout = ff_vk_shader_rep_fmt(s->vkctx.input_format, FF_VK_REP_UINT), .mem_quali = "readonly", .dimensions = 2, .elems = av_pix_fmt_count_planes(s->vkctx.input_format), .stages = VK_SHADER_STAGE_COMPUTE_BIT, }, { .name = "cur_img", .type = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, .mem_layout = ff_vk_shader_rep_fmt(s->vkctx.input_format, FF_VK_REP_UINT), .mem_quali = "readonly", .dimensions = 2, .elems = av_pix_fmt_count_planes(s->vkctx.input_format), .stages = VK_SHADER_STAGE_COMPUTE_BIT, }, { .name = "sad_buffer", .type = VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, .stages = VK_SHADER_STAGE_COMPUTE_BIT, .buf_content = "uint plane_sad[4][16];", } }; RET(ff_vk_shader_add_descriptor_set(vkctx, &s->shd, desc, 3, 0, 0)); GLSLC(0, void main() ); GLSLC(0, { ); GLSLF(1, const uint slice = gl_WorkGroupID.x %% %u; ,SLICES); GLSLC(1, const ivec2 pos = ivec2(gl_GlobalInvocationID.xy); ); for (int i = 0; i < s->nb_planes; i++) { GLSLF(1, if (IS_WITHIN(pos, imageSize(cur_img[%d]))) { ,i); GLSLF(2, uvec4 prev = imageLoad(prev_img[%d], pos); ,i); GLSLF(2, uvec4 cur = imageLoad(cur_img[%d], pos); ,i); GLSLC(2, uvec4 sad = abs(ivec4(cur) - ivec4(prev)); ); GLSLC(2, uint sum = subgroupAdd(sad.x + sad.y + sad.z); ); GLSLC(2, if (subgroupElect()) ); GLSLF(3, atomicAdd(plane_sad[%d][slice], sum); ,i); GLSLC(1, } ); } GLSLC(0, } ); RET(spv->compile_shader(vkctx, spv, &s->shd, &spv_data, &spv_len, "main", &spv_opaque)); RET(ff_vk_shader_link(vkctx, &s->shd, spv_data, spv_len, "main")); RET(ff_vk_shader_register_exec(vkctx, &s->e, &s->shd)); s->initialized = 1; fail: if (spv_opaque) spv->free_shader(spv, &spv_opaque); if (spv) spv->uninit(&spv); return err; } static double evaluate(AVFilterContext *ctx, const SceneDetectBuf *buf) { SceneDetectVulkanContext *s = ctx->priv; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->vkctx.input_format); const AVFilterLink *inlink = ctx->inputs[0]; uint64_t sad = 0; double mafd, diff; const uint64_t count = s->nb_planes * (inlink->w * inlink->h); av_assert2(s->nb_planes == 1 || !(desc->log2_chroma_w || desc->log2_chroma_h)); for (int n = 0; n < s->nb_planes; n++) { for (int i = 0; i < SLICES; i++) sad += buf->plane_sad[n][i]; } av_assert0(sad <= count * (1ULL << desc->comp[0].depth)); mafd = (double) sad * 100.0 / count / (1ULL << desc->comp[0].depth); diff = fabs(mafd - s->prev_mafd); s->prev_mafd = mafd; return av_clipf(FFMIN(mafd, diff), 0.0, 100.0); } static int scdet_vulkan_filter_frame(AVFilterLink *link, AVFrame *in) { int err; AVFilterContext *ctx = link->dst; SceneDetectVulkanContext *s = ctx->priv; AVFilterLink *outlink = ctx->outputs[0]; VkImageView prev_views[AV_NUM_DATA_POINTERS]; VkImageView cur_views[AV_NUM_DATA_POINTERS]; VkImageMemoryBarrier2 img_bar[8]; int nb_img_bar = 0; FFVulkanContext *vkctx = &s->vkctx; FFVulkanFunctions *vk = &vkctx->vkfn; FFVkExecContext *exec = NULL; AVBufferRef *buf = NULL; FFVkBuffer *buf_vk; SceneDetectBuf *sad; double score = 0.0; char str[64]; if (!s->initialized) RET(init_filter(ctx)); av_frame_free(&s->prev); s->prev = s->cur; s->cur = av_frame_clone(in); if (!s->prev) goto done; RET(ff_vk_get_pooled_buffer(vkctx, &s->det_buf_pool, &buf, VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT, NULL, sizeof(SceneDetectBuf), VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT | VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT)); buf_vk = (FFVkBuffer *)buf->data; sad = (SceneDetectBuf *) buf_vk->mapped_mem; exec = ff_vk_exec_get(vkctx, &s->e); ff_vk_exec_start(vkctx, exec); RET(ff_vk_exec_add_dep_frame(vkctx, exec, s->prev, VK_PIPELINE_STAGE_2_NONE, VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT)); RET(ff_vk_create_imageviews(vkctx, exec, prev_views, s->prev, FF_VK_REP_UINT)); ff_vk_shader_update_img_array(vkctx, exec, &s->shd, s->prev, prev_views, 0, 0, VK_IMAGE_LAYOUT_GENERAL, VK_NULL_HANDLE); ff_vk_frame_barrier(vkctx, exec, s->prev, img_bar, &nb_img_bar, VK_PIPELINE_STAGE_2_ALL_COMMANDS_BIT, VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT, VK_ACCESS_SHADER_READ_BIT, VK_IMAGE_LAYOUT_GENERAL, VK_QUEUE_FAMILY_IGNORED); RET(ff_vk_exec_add_dep_frame(vkctx, exec, s->cur, VK_PIPELINE_STAGE_2_NONE, VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT)); RET(ff_vk_create_imageviews(vkctx, exec, cur_views, s->cur, FF_VK_REP_UINT)); ff_vk_shader_update_img_array(vkctx, exec, &s->shd, s->cur, cur_views, 0, 1, VK_IMAGE_LAYOUT_GENERAL, VK_NULL_HANDLE); ff_vk_frame_barrier(vkctx, exec, s->cur, img_bar, &nb_img_bar, VK_PIPELINE_STAGE_2_ALL_COMMANDS_BIT, VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT, VK_ACCESS_SHADER_READ_BIT, VK_IMAGE_LAYOUT_GENERAL, VK_QUEUE_FAMILY_IGNORED); /* zero buffer */ vk->CmdPipelineBarrier2(exec->buf, &(VkDependencyInfo) { .sType = VK_STRUCTURE_TYPE_DEPENDENCY_INFO, .pBufferMemoryBarriers = &(VkBufferMemoryBarrier2) { .sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER_2, .srcStageMask = VK_PIPELINE_STAGE_2_NONE, .dstStageMask = VK_PIPELINE_STAGE_2_TRANSFER_BIT, .dstAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT, .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED, .dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED, .buffer = buf_vk->buf, .size = buf_vk->size, .offset = 0, }, .bufferMemoryBarrierCount = 1, }); vk->CmdFillBuffer(exec->buf, buf_vk->buf, 0, buf_vk->size, 0x0); vk->CmdPipelineBarrier2(exec->buf, &(VkDependencyInfo) { .sType = VK_STRUCTURE_TYPE_DEPENDENCY_INFO, .pImageMemoryBarriers = img_bar, .imageMemoryBarrierCount = nb_img_bar, .pBufferMemoryBarriers = &(VkBufferMemoryBarrier2) { .sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER_2, .srcStageMask = VK_PIPELINE_STAGE_2_TRANSFER_BIT, .dstStageMask = VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT, .srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT, .dstAccessMask = VK_ACCESS_2_SHADER_STORAGE_READ_BIT | VK_ACCESS_2_SHADER_STORAGE_WRITE_BIT, .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED, .dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED, .buffer = buf_vk->buf, .size = buf_vk->size, .offset = 0, }, .bufferMemoryBarrierCount = 1, }); RET(ff_vk_shader_update_desc_buffer(&s->vkctx, exec, &s->shd, 0, 2, 0, buf_vk, 0, buf_vk->size, VK_FORMAT_UNDEFINED)); ff_vk_exec_bind_shader(vkctx, exec, &s->shd); vk->CmdDispatch(exec->buf, FFALIGN(in->width, s->shd.lg_size[0]) / s->shd.lg_size[0], FFALIGN(in->height, s->shd.lg_size[1]) / s->shd.lg_size[1], s->shd.lg_size[2]); vk->CmdPipelineBarrier2(exec->buf, &(VkDependencyInfo) { .sType = VK_STRUCTURE_TYPE_DEPENDENCY_INFO, .pBufferMemoryBarriers = &(VkBufferMemoryBarrier2) { .sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER_2, .srcStageMask = VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT, .dstStageMask = VK_PIPELINE_STAGE_2_HOST_BIT, .srcAccessMask = VK_ACCESS_2_SHADER_STORAGE_READ_BIT | VK_ACCESS_2_SHADER_STORAGE_WRITE_BIT, .dstAccessMask = VK_ACCESS_HOST_READ_BIT, .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED, .dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED, .buffer = buf_vk->buf, .size = buf_vk->size, .offset = 0, }, .bufferMemoryBarrierCount = 1, }); RET(ff_vk_exec_submit(vkctx, exec)); ff_vk_exec_wait(vkctx, exec); score = evaluate(ctx, sad); done: snprintf(str, sizeof(str), "%0.3f", s->prev_mafd); av_dict_set(&in->metadata, "lavfi.scd.mafd", str, 0); snprintf(str, sizeof(str), "%0.3f", score); av_dict_set(&in->metadata, "lavfi.scd.score", str, 0); if (score >= s->threshold) { const char *pts = av_ts2timestr(in->pts, &link->time_base); av_dict_set(&in->metadata, "lavfi.scd.time", pts, 0); av_log(s, AV_LOG_INFO, "lavfi.scd.score: %.3f, lavfi.scd.time: %s\n", score, pts); } av_buffer_unref(&buf); if (!s->sc_pass || score >= s->threshold) return ff_filter_frame(outlink, in); else { av_frame_free(&in); return 0; } fail: if (exec) ff_vk_exec_discard_deps(&s->vkctx, exec); av_frame_free(&in); av_buffer_unref(&buf); return err; } static void scdet_vulkan_uninit(AVFilterContext *avctx) { SceneDetectVulkanContext *s = avctx->priv; FFVulkanContext *vkctx = &s->vkctx; av_frame_free(&s->prev); av_frame_free(&s->cur); ff_vk_exec_pool_free(vkctx, &s->e); ff_vk_shader_free(vkctx, &s->shd); av_buffer_pool_uninit(&s->det_buf_pool); ff_vk_uninit(&s->vkctx); s->initialized = 0; } #define OFFSET(x) offsetof(SceneDetectVulkanContext, x) #define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM) static const AVOption scdet_vulkan_options[] = { { "threshold", "set scene change detect threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., FLAGS }, { "t", "set scene change detect threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., FLAGS }, { "sc_pass", "Set the flag to pass scene change frames", OFFSET(sc_pass), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, FLAGS }, { "s", "Set the flag to pass scene change frames", OFFSET(sc_pass), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(scdet_vulkan); static const AVFilterPad scdet_vulkan_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = &scdet_vulkan_filter_frame, .config_props = &ff_vk_filter_config_input, }, }; static const AVFilterPad scdet_vulkan_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = &ff_vk_filter_config_output, }, }; const FFFilter ff_vf_scdet_vulkan = { .p.name = "scdet_vulkan", .p.description = NULL_IF_CONFIG_SMALL("Detect video scene change"), .p.priv_class = &scdet_vulkan_class, .p.flags = AVFILTER_FLAG_HWDEVICE, .priv_size = sizeof(SceneDetectVulkanContext), .init = &ff_vk_filter_init, .uninit = &scdet_vulkan_uninit, FILTER_INPUTS(scdet_vulkan_inputs), FILTER_OUTPUTS(scdet_vulkan_outputs), FILTER_SINGLE_PIXFMT(AV_PIX_FMT_VULKAN), .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE, };