feat: 节奏模板让批量变体片段时长分布不同 (Issue #1764)
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- 新增 RHYTHM_TEMPLATES 节奏模板池(6 种权重序列) - get_rhythm_template(seed):根据变体 seed 随机选模板 - adapt_template_length():将模板适配到实际片段数 - plan_clip_durations() 支持 rhythm_template 参数按权重分配时长 - 保底约束:每段 >= 2s,总时长 = 配音时长 - edit_plan_service: ensure_batch_variant_plans 为每个变体生成不同节奏模板 - 17 个新测试覆盖模板池/适配/分配/验收
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@@ -784,11 +784,17 @@ class EditPlanService:
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from packages.domain.voice_duration_planner import plan_clip_durations, total_output_duration
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# #1764:从 plan config 读取节奏模板
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rhythm_template = None
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if plan and hasattr(plan, "config") and plan.config:
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rhythm_template = plan.config.get("rhythm_template")
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target = plan_clip_durations(
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len(clips),
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voice,
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transition_effects=[c.transition_effect for c in clips],
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transition_durations=[float(c.transition_duration or 0.0) for c in clips],
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rhythm_template=rhythm_template,
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)
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if not target:
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return None
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@@ -907,6 +913,28 @@ class EditPlanService:
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)
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plan_ids.append(variant.id)
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# #1764:为每个变体生成独立节奏模板(让批量视频片段时长分布不同)
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from packages.domain.voice_duration_planner import RHYTHM_TEMPLATES, adapt_template_length
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clip_count = 0
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if voice_durations and len(voice_durations) > 0:
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# 从源 plan 获取片段数
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source_plan = self.get_plan(source_plan_id)
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if source_plan and hasattr(source_plan, "clips"):
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clip_count = len(list(source_plan.clips)) if source_plan.clips else 0
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rhythm_templates_for_variants = []
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if clip_count > 0:
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for idx in range(len(plan_ids)):
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# 每个变体用不同的 seed 选择节奏模板
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variant_seed = rng.randint(0, 999999)
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template = adapt_template_length(
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RHYTHM_TEMPLATES[variant_seed % len(RHYTHM_TEMPLATES)],
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clip_count
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)
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rhythm_templates_for_variants.append(template)
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logger.info("变体 %d 节奏模板: plan=%s template=%s", idx, plan_ids[idx], template)
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# 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)
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from packages.domain.variant_plan_selector import generate_visual_perturbation
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@@ -916,7 +944,11 @@ class EditPlanService:
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# 变体 0 不做 hflip(保持预览 plan 原始画面方向)
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if idx == 0:
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perturbation["hflip"] = False
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self.update_plan_config(pid, {"visual_perturbation": perturbation})
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config_update = {"visual_perturbation": perturbation}
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# #1764:写入节奏模板
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if idx < len(rhythm_templates_for_variants):
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config_update["rhythm_template"] = rhythm_templates_for_variants[idx]
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self.update_plan_config(pid, config_update)
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logger.info("变体 %d 视觉扰动: plan=%s perturbation=%s", idx, pid, perturbation)
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except Exception:
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logger.exception("变体 %d 视觉扰动生成失败(不阻断): plan=%s", idx, pid)
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@@ -1,4 +1,4 @@
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"""配音时长 → 片段时长分配纯函数(#1749)。
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"""配音时长 → 片段时长分配纯函数(#1749 + #1764 节奏模板)。
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定稿规则(工单 #1749):
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1. 片段数 = 模板片段数,定死,不因素材增减;
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@@ -8,6 +8,12 @@
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禁止慢放、禁止截断配音;
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4. 任何情况下不得因素材时长/数量报错打断用户。
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#1764 节奏模板:
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- 预设 6 种权重序列,不同变体用不同节奏模板
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- 片段时长 = 配音总时长 × 该片段权重 / 权重总和
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- 平均分配作为权重全 1 的特例保留
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- 每个片段 >= MIN_CLIP_DURATION(2秒)
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本模块为纯函数:输入片段骨架(每段转场效果/时长)与配音总时长,
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输出每段目标时长(target duration)与成片总时长。不碰 DB、不碰素材。
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"""
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@@ -15,10 +21,71 @@
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from __future__ import annotations
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import logging
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import random
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from typing import Optional
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logger = logging.getLogger(__name__)
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#: 单段最小时长(秒):低于此值播放器/渲染链路易出问题
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MIN_CLIP_DURATION = 2.0
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#: 成片总时长与配音时长的可接受误差(秒)
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TOTAL_DURATION_TOLERANCE = 0.5
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# ── #1764 节奏模板池 ──────────────────────────────────────────────────────
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# 每种模板是权重序列,权重值代表相对时长比例
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# 变体基于 variant_seed 随机选一个模板,实现不同变体时长结构不同
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RHYTHM_TEMPLATES: list[list[int]] = [
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[1, 1, 1, 1, 1], # 平均(基准)
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[2, 1, 3, 1, 2], # 中间长,两端短
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[1, 2, 1, 2, 1], # 偶数段长
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[3, 1, 1, 1, 3], # 两端长,中间短
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[1, 1, 3, 2, 1], # 后段渐长
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[2, 1, 1, 3, 1], # 前段较长 + 第4段最长
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]
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def get_rhythm_template(variant_seed: int | None = None) -> list[int]:
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"""根据 variant_seed 选择一个节奏模板。
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Args:
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variant_seed: 变体随机种子;None 时返回平均模板
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Returns:
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权重序列(list[int])
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"""
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if variant_seed is None:
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return RHYTHM_TEMPLATES[0] # 默认平均
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rng = random.Random(variant_seed)
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return rng.choice(RHYTHM_TEMPLATES)
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def adapt_template_length(template: list[int], clip_count: int) -> list[int]:
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"""将节奏模板适配到实际片段数。
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片段数 != 模板长度时:
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- clip_count < len(template): 截断
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- clip_count > len(template): 循环填充
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Args:
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template: 原始权重序列
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clip_count: 实际片段数
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Returns:
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适配后的权重序列(长度 == clip_count)
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"""
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if clip_count <= 0:
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return []
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if clip_count == len(template):
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return template[:]
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if clip_count < len(template):
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return template[:clip_count]
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# clip_count > len(template): 循环填充
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result = []
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for i in range(clip_count):
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result.append(template[i % len(template)])
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return result
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#: 单段最小时长(秒):低于此值播放器/渲染链路易出问题
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MIN_CLIP_DURATION = 1.0
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@@ -43,9 +110,12 @@ def plan_clip_durations(
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voice_duration: float,
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transition_effects: Optional[list[Optional[str]]] = None,
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transition_durations: Optional[list[float]] = None,
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rhythm_template: Optional[list[int]] = None,
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) -> list[float]:
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"""把配音总时长分配到 clip_count 段,返回每段目标时长(秒)。
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#1764:支持节奏模板,按权重比例分配时长;无模板时平均分配(向后兼容)。
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分配口径:Σ段长 − Σ转场重叠 = 配音时长(成片净时长 = 配音)。
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转场重叠发生在相邻片段之间,共 clip_count-1 处;第 i 处重叠取
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**后一段(i+1)** 的转场设置(与 xfade 构建口径一致:转场挂在后段)。
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@@ -92,13 +162,36 @@ def plan_clip_durations(
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MIN_CLIP_DURATION,
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)
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per_clip = gross / clip_count
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result = [round(per_clip, 3) for _ in range(clip_count)]
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# 末段吸收舍入误差:直接用 gross - 前段之和
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result[-1] = round(gross - sum(result[:-1]), 3)
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# #1764:按节奏模板权重分配(无模板时全 1 = 平均分配)
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weights = rhythm_template if rhythm_template and len(rhythm_template) == clip_count else [1] * clip_count
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# 确保每个片段 >= MIN_CLIP_DURATION
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# 先按权重分配,再检查最小值
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total_weight = sum(weights)
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raw_durations = [(w / total_weight) * gross for w in weights]
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# 保底检查:如果有片段 < MIN_CLIP_DURATION,提升它并从最长片段扣
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result = [round(d, 3) for d in raw_durations]
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for _ in range(3): # 最多迭代 3 次
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min_idx = min(range(len(result)), key=lambda i: result[i])
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if result[min_idx] >= MIN_CLIP_DURATION:
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break
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# 从最长片段借时长
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max_idx = max(range(len(result)), key=lambda i: result[i])
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if max_idx == min_idx or result[max_idx] <= MIN_CLIP_DURATION:
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# 无法再调整,强制保底
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result[min_idx] = MIN_CLIP_DURATION
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break
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deficit = MIN_CLIP_DURATION - result[min_idx]
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result[min_idx] = MIN_CLIP_DURATION
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result[max_idx] = round(result[max_idx] - deficit, 3)
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# 末段吸收舍入误差
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total_assigned = sum(result[:-1])
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result[-1] = round(gross - total_assigned, 3)
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if result[-1] < MIN_CLIP_DURATION:
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# 极端情况下末段被舍入压得过小,摊平
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result[-1] = MIN_CLIP_DURATION
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return result
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@@ -0,0 +1,189 @@
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"""节奏模板单元测试(Issue #1764)。
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覆盖:
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- RHYTHM_TEMPLATES 池定义(6 种模板)
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- get_rhythm_template:根据 seed 选择模板
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- adapt_template_length:适配不同片段数
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- plan_clip_durations:按权重分配时长
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- 时长约束:总时长 ≈ 配音时长,每段 >= 2s
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"""
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from __future__ import annotations
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import pytest
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from packages.domain.voice_duration_planner import (
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MIN_CLIP_DURATION,
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RHYTHM_TEMPLATES,
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adapt_template_length,
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get_rhythm_template,
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plan_clip_durations,
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total_output_duration,
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)
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class TestRhythmTemplates:
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"""节奏模板池测试。"""
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def test_six_templates_defined(self):
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"""预设 6 种节奏模板。"""
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assert len(RHYTHM_TEMPLATES) == 6
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def test_average_template_is_all_ones(self):
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"""第一种模板是平均(全 1)。"""
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assert RHYTHM_TEMPLATES[0] == [1, 1, 1, 1, 1]
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def test_all_templates_have_5_elements(self):
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"""所有模板长度为 5(会被 adapt 适配)。"""
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for tpl in RHYTHM_TEMPLATES:
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assert len(tpl) == 5
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class TestGetRhythmTemplate:
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"""get_rhythm_template 测试。"""
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def test_none_seed_returns_average(self):
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"""None seed 返回平均模板。"""
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assert get_rhythm_template(None) == [1, 1, 1, 1, 1]
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def test_same_seed_same_template(self):
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"""相同 seed 返回相同模板。"""
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tpl1 = get_rhythm_template(42)
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tpl2 = get_rhythm_template(42)
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assert tpl1 == tpl2
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def test_different_seeds_may_differ(self):
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"""不同 seed 可能返回不同模板。"""
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templates_seen = set()
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for seed in range(100):
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tpl = tuple(get_rhythm_template(seed))
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templates_seen.add(tpl)
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# 100 个 seed 应该至少看到 3 种不同模板
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assert len(templates_seen) >= 3
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class TestAdaptTemplateLength:
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"""adapt_template_length 测试。"""
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def test_same_length(self):
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"""片段数 == 模板长度时直接返回。"""
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tpl = [2, 1, 3, 1, 2]
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assert adapt_template_length(tpl, 5) == [2, 1, 3, 1, 2]
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def test_shorter_clip_count(self):
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"""片段数 < 模板长度时截断。"""
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tpl = [2, 1, 3, 1, 2]
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assert adapt_template_length(tpl, 3) == [2, 1, 3]
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def test_longer_clip_count(self):
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"""片段数 > 模板长度时循环填充。"""
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tpl = [2, 1, 3]
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result = adapt_template_length(tpl, 7)
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assert result == [2, 1, 3, 2, 1, 3, 2]
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def test_zero_clip_count(self):
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"""片段数 0 返回空列表。"""
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assert adapt_template_length([1, 2, 3], 0) == []
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class TestPlanClipDurationsWithRhythm:
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"""plan_clip_durations 节奏模板测试。"""
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def test_average_template_equals_old_behavior(self):
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"""全 1 模板 = 原来的平均分配。"""
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voice = 20.0
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clips = 4
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result = plan_clip_durations(clips, voice, rhythm_template=[1, 1, 1, 1])
|
||||
# 每段应该 ≈ 5s
|
||||
assert all(abs(d - 5.0) < 0.1 for d in result)
|
||||
assert abs(sum(result) - voice) < 0.1
|
||||
|
||||
def test_weighted_template_different_durations(self):
|
||||
"""权重模板产生不同时长的片段。"""
|
||||
voice = 18.0
|
||||
clips = 5
|
||||
# 权重 [2, 1, 3, 1, 2]:第 3 段最长,第 2/4 段最短
|
||||
template = [2, 1, 3, 1, 2]
|
||||
result = plan_clip_durations(clips, voice, rhythm_template=template)
|
||||
|
||||
# 总时长 ≈ 配音时长
|
||||
assert abs(sum(result) - voice) < 0.5
|
||||
|
||||
# 第 3 段应该最长
|
||||
assert result[2] > result[1]
|
||||
assert result[2] > result[3]
|
||||
|
||||
def test_min_clip_duration_enforced(self):
|
||||
"""每段 >= MIN_CLIP_DURATION (2s)。"""
|
||||
voice = 15.0
|
||||
clips = 5
|
||||
# 极端权重:某段权重极低
|
||||
template = [10, 1, 1, 1, 1]
|
||||
result = plan_clip_durations(clips, voice, rhythm_template=template)
|
||||
|
||||
for d in result:
|
||||
assert d >= MIN_CLIP_DURATION
|
||||
|
||||
def test_total_duration_with_transitions(self):
|
||||
"""含转场时总时长仍然正确。"""
|
||||
voice = 20.0
|
||||
clips = 4
|
||||
effects = [None, "xfade", "fade", "cut"]
|
||||
durations = [0.0, 0.5, 0.3, 0.0]
|
||||
template = [2, 1, 1, 2]
|
||||
|
||||
result = plan_clip_durations(
|
||||
clips, voice,
|
||||
transition_effects=effects,
|
||||
transition_durations=durations,
|
||||
rhythm_template=template,
|
||||
)
|
||||
|
||||
# 成片净时长 = Σ段长 - Σ转场重叠 ≈ 配音时长
|
||||
output = total_output_duration(result, effects, durations)
|
||||
assert abs(output - voice) < 0.5
|
||||
|
||||
def test_no_template_backward_compatible(self):
|
||||
"""不传模板时行为与旧版一致(平均分配)。"""
|
||||
voice = 16.0
|
||||
clips = 4
|
||||
result = plan_clip_durations(clips, voice)
|
||||
assert all(abs(d - 4.0) < 0.1 for d in result)
|
||||
|
||||
def test_six_templates_produce_different_structures(self):
|
||||
"""6 种模板产生不同的时长结构。"""
|
||||
voice = 25.0
|
||||
clips = 5
|
||||
structures = set()
|
||||
|
||||
for tpl in RHYTHM_TEMPLATES:
|
||||
result = plan_clip_durations(clips, voice, rhythm_template=tpl)
|
||||
# 用 round 后的元组作为结构指纹
|
||||
structure = tuple(round(d, 1) for d in result)
|
||||
structures.add(structure)
|
||||
|
||||
# 至少 4 种不同结构
|
||||
assert len(structures) >= 4
|
||||
|
||||
|
||||
class TestIssue1764Acceptance:
|
||||
"""Issue #1764 验收测试。"""
|
||||
|
||||
def test_batch_3_variants_at_least_2_different(self):
|
||||
"""批量 3 个变体,至少 2 组不同片段时长序列。"""
|
||||
voice = 20.0
|
||||
clips = 5
|
||||
|
||||
# 模拟 3 个变体用不同 seed
|
||||
seeds = [100, 200, 300]
|
||||
structures = []
|
||||
|
||||
for seed in seeds:
|
||||
template = get_rhythm_template(seed)
|
||||
adapted = adapt_template_length(template, clips)
|
||||
durations = plan_clip_durations(clips, voice, rhythm_template=adapted)
|
||||
structures.append(tuple(round(d, 1) for d in durations))
|
||||
|
||||
# 至少 2 种不同结构
|
||||
unique = len(set(structures))
|
||||
assert unique >= 2, f"Expected >= 2 unique structures, got {unique}: {structures}"
|
||||
Reference in New Issue
Block a user