feat: #1767 BGM 池差异化分配，打破变体间音频指纹一致性 (#1785)

Co-authored-by: xiaoxia <dev@xiaoxiajianji.com> Co-committed-by: xiaoxia <dev@xiaoxiajianji.com>
2026-09-08 10:12:52 +08:00
parent 12a9efc65d
commit 98cf571ab3
4 changed files with 650 additions and 5 deletions
@@ -932,6 +932,17 @@ class EditPlanService:
                rhythm_templates_for_variants.append(template)
                logger.info("变体 %d 节奏模板: plan=%s template=%s", idx, plan_ids[idx], template)

+        # #1767：BGM 池差异化分配（让批量变体使用不同 BGM / 段落 / 音量）
+        from packages.domain.bgm_pool import allocate_bgm_pool_for_variants
+
+        source_bgm_config = {}
+        source_plan = self.get_plan(source_plan_id)
+        if source_plan and source_plan.config:
+            source_bgm_config = source_plan.config.get("bgm", {}) or {}
+
+        variant_seeds_for_bgm = [rng.randint(0, 999999) for _ in plan_ids]
+        bgm_pool_assignments = allocate_bgm_pool_for_variants(source_bgm_config, variant_seeds_for_bgm)
+
        # 为每个变体生成独立视觉扰动参数（让批量视频画面本身更不同）
        from packages.domain.variant_plan_selector import generate_visual_perturbation

@@ -950,8 +961,20 @@ class EditPlanService:

                pixel_pert = generate_pixel_perturbation(rng)
                config_update["pixel_perturbation"] = pixel_pert
+                # #1767：写入 BGM 池分配（覆盖 bgm 配置中的 preset_id / audio_offset / volume_adjust_db）
+                if idx < len(bgm_pool_assignments):
+                    existing_bgm = dict((source_plan.config or {}).get("bgm", {}) or {})
+                    existing_bgm.update(bgm_pool_assignments[idx])
+                    config_update["bgm"] = existing_bgm
                self.update_plan_config(pid, config_update)
-                logger.info("变体 %d 视觉扰动+像素扰动: plan=%s vis=%s pix=%s", idx, pid, perturbation, pixel_pert)
+                logger.info(
+                    "变体 %d 视觉扰动+像素扰动+BGM池: plan=%s vis=%s pix=%s bgm=%s",
+                    idx,
+                    pid,
+                    perturbation,
+                    pixel_pert,
+                    bgm_pool_assignments[idx] if idx < len(bgm_pool_assignments) else None,
+                )
            except Exception:
                logger.exception("变体 %d 视觉扰动生成失败（不阻断）: plan=%s", idx, pid)