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xiaoxia-saas/packages/shared/ai_service.py
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xiaoxia 0e78f175fe
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fix(#2174 P0): 信任链从i2i改为t2i文生图——方舟实测验证通过
#2170/#2172的信任链用Seedream图生图(i2i,传reference_images=用户真人照),
实测产物不被Seedance信任,仍被400 portrait_intercept拦截。

方舟文档+实测确认:信任的是Seedream文生图(t2i)产物——纯prompt描述人物,
不传reference_images,产物是纯模型生成人像,同账号30天内可直接传Seedance。

改动:
- VLM prompt新增portrait_prompt字段(60-100字人物外貌描述)
- preheat_trust_chain签名从portrait_urls改为portrait_descriptions,t2i模式不传reference_images
- video_generation移除现场跑i2i逻辑,仅使用预热好的t2i结果;预热失败走#2166自动降级t2v
- 预热时机从VLM前改为VLM后(需要VLM输出的portrait_prompt),仍与文案阶段并行
- 单测适配:TestTrustChain全部改为pre_trusted_images路径验证

实测验证(充值后):
- Seedream flash t2i ~15s出图,人像prompt中英文混合写实风格
- Seedance 2.5 i2v用t2i产物URL → 成功出5s视频(120s)
- Seedance 2.0-mini i2v用t2i产物URL → 成功出5s视频
- 对照组直传用户真人照片 → 400 portrait_intercept(预期)
2026-10-04 15:31:38 +08:00

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"""AI 服务层 — 智能推荐 & 封面生成.
提供 AI 推荐片段编排方案和封面生成的核心业务逻辑。
API 层和 Worker 层都从此模块导入,避免 API 直接依赖 Worker 代码。
"""
from __future__ import annotations
import copy
import json
import logging
import random
import time
from typing import Any, Optional
from packages.domain.config_schemas import DEFAULT_EDIT_PLAN_CONFIG
from packages.shared.ai_client import get_doubao_client
logger = logging.getLogger(__name__)
# ── AI 推荐片段方案 ──────────────────────────────────────────────────────────
def _fallback_recommend_clips(
plan_id: str,
template_id: str,
asset_ids: list[str],
editing_mode: str,
target_duration: float,
) -> dict[str, Any]:
"""本地降级推荐方案(原 stub 逻辑).
当豆包 API 不可用或调用失败时使用,基于模板规则生成模拟推荐数据。
"""
# 模拟 AI 分析耗时
time.sleep(0.5)
# 根据素材数量生成推荐片段
clips: list[dict[str, Any]] = []
order = 0
# 开场片段
clips.append(
{
"clip_type": "intro",
"order": order,
"text_content": "精彩看点",
"duration": 3.0,
"transition_effect": "fade",
"asset_id": asset_ids[0] if asset_ids else "",
"start_time": 0.0,
"config": {},
}
)
order += 1
# 为每个素材生成展示片段
per_clip_duration = max(2.0, (target_duration - 6.0) / max(len(asset_ids), 1))
for i, asset_id in enumerate(asset_ids):
clips.append(
{
"clip_type": "showcase",
"order": order,
"text_content": f"展示片段 {i + 1}",
"duration": round(per_clip_duration, 1),
"transition_effect": "cut",
"asset_id": asset_id,
"start_time": 0.0,
"config": {},
}
)
order += 1
# 结尾 CTA
clips.append(
{
"clip_type": "outro",
"order": order,
"text_content": "感谢观看",
"duration": 3.0,
"transition_effect": "fade",
"asset_id": "",
"start_time": 0.0,
"config": {},
}
)
order += 1
# 生成推荐 config
config = copy.deepcopy(DEFAULT_EDIT_PLAN_CONFIG)
config["title"]["text"] = f"精选视频 — {len(asset_ids)} 个片段"
config["title"]["ai_auto"] = True
return {
"clips": clips,
"config": config,
"total_duration": round(sum(c["duration"] for c in clips), 1),
"confidence": round(random.uniform(0.75, 0.95), 2),
}
def _parse_recommend_response(
content: str,
asset_ids: list[str],
target_duration: float,
) -> Optional[dict[str, Any]]:
"""解析豆包返回的推荐方案.
期望返回结构:
{
"clips": [
{"clip_type": "intro/showcase/outro", "order": 0,
"text_content": "...", "duration": 3.0,
"transition_effect": "fade/cut", "asset_id": "...",
"start_time": 0.0, "config": {}}
],
"title": "视频标题",
"confidence": 0.85
}
"""
if not content:
return None
try:
cleaned = content.strip()
if cleaned.startswith("```"):
cleaned = cleaned.strip("`")
if cleaned.lower().startswith("json"):
cleaned = cleaned[4:]
cleaned = cleaned.strip()
data = json.loads(cleaned)
if not isinstance(data, dict):
return None
clips_data = data.get("clips", [])
if not isinstance(clips_data, list) or len(clips_data) == 0:
return None
clips: list[dict[str, Any]] = []
for _, clip in enumerate(clips_data):
if not isinstance(clip, dict):
continue
asset_id = str(clip.get("asset_id", ""))
# 校验 asset_id 是否在输入列表中
if asset_id and asset_id not in asset_ids:
asset_id = ""
clips.append(
{
"clip_type": clip.get("clip_type", "showcase"),
"order": clip.get("order", len(clips)),
"text_content": str(clip.get("text_content", "")),
"duration": max(1.0, min(30.0, float(clip.get("duration", 3.0)))),
"transition_effect": clip.get("transition_effect", "cut"),
"asset_id": asset_id,
"start_time": max(0.0, float(clip.get("start_time", 0.0))),
"config": clip.get("config", {}) or {},
}
)
if not clips:
return None
# 按 order 排序
clips.sort(key=lambda c: c["order"])
# 重新编号 order 保证连续
for i, clip in enumerate(clips):
clip["order"] = i
config = copy.deepcopy(DEFAULT_EDIT_PLAN_CONFIG)
title = data.get("title", "")
if title:
config["title"]["text"] = str(title)
config["title"]["ai_auto"] = True
confidence = float(data.get("confidence", 0.7))
confidence = max(0.0, min(1.0, confidence))
total_duration = round(sum(c["duration"] for c in clips), 1)
return {
"clips": clips,
"config": config,
"total_duration": total_duration,
"confidence": round(confidence, 2),
}
except (json.JSONDecodeError, ValueError, TypeError, KeyError):
return None
def _call_ai_recommend_service(
plan_id: str,
template_id: str,
asset_ids: list[str],
editing_mode: str,
target_duration: float,
asset_analyses: Optional[dict[str, str]] = None,
) -> dict[str, Any]:
"""调用 AI 推荐服务生成片段编排方案.
优先使用豆包大模型生成,失败或未配置时降级为本地规则生成。
当提供 asset_analyses 时,会将每个素材的视频理解结果注入 prompt,
让 LLM 能基于视频实际内容做智能编排。
Args:
plan_id: 剪辑计划 ID
template_id: 模板 ID
asset_ids: 素材 ID 列表
editing_mode: 剪辑模式
target_duration: 目标时长(秒)
asset_analyses: 可选,{asset_id: 视频理解文本} 映射
"""
client = get_doubao_client()
if not client.is_available:
logger.info("豆包API未配置,使用本地降级生成AI推荐方案")
return _fallback_recommend_clips(plan_id, template_id, asset_ids, editing_mode, target_duration)
# 构建素材描述(含视频理解结果)
asset_analyses = asset_analyses or {}
asset_lines = []
for aid in asset_ids[:30]:
analysis = asset_analyses.get(aid, "")
if analysis:
# 截断过长的分析结果,避免 token 爆炸
analysis_truncated = analysis[:300] + ("..." if len(analysis) > 300 else "")
asset_lines.append(f" - 素材ID: {aid}\n 内容描述: {analysis_truncated}")
else:
asset_lines.append(f" - 素材ID: {aid}")
assets_desc = "\n".join(asset_lines)
has_analysis = any(aid in asset_analyses for aid in asset_ids[:30])
# 构建 prompt
system_prompt = "你是一个专业的视频剪辑导演助手。根据提供的素材列表和目标时长,设计一个完整的视频片段编排方案。\n"
if has_analysis:
system_prompt += (
"每个素材附带了 AI 视频理解的内容描述,请根据素材的实际内容来决策编排:\n"
"- 将内容相关的素材放在一起,保持叙事连贯\n"
"- 根据素材内容合理安排片段顺序(如开场用吸引人的画面、高潮部分紧凑切换等)\n"
"- 为每个片段选择最匹配的素材,并在 text_content 中体现素材主题\n"
)
system_prompt += (
"要求:\n"
"1. 片段类型分为三类:intro(开场)、showcase(展示)、outro(结尾)\n"
"2. 每个片段包含:clip_type、order、text_content(字幕/标题文字)、"
"duration(时长秒)、transition_effect(转场效果:fade/cut/dissolve)、"
"asset_id(使用的素材ID)、start_time(素材起始时间秒)\n"
"3. 总时长接近 target_duration,每个素材至少用一次\n"
"4. 转场效果合理分配,不要全用cut\n"
"5. 返回纯JSON,不要其他文字\n"
'返回格式:{"clips": [...], "title": "视频标题", "confidence": 0.85}'
)
user_prompt = (
f"剪辑计划ID: {plan_id}\n"
f"模板ID: {template_id}\n"
f"剪辑模式: {editing_mode}\n"
f"目标时长: {target_duration}秒\n"
f"素材列表(共{len(asset_ids)}个):\n{assets_desc}\n\n"
f"请设计完整的片段编排方案:"
)
messages = [
{"role": "system", "content": system_prompt},
{"role": "user", "content": user_prompt},
]
result = client.chat_completion(
messages=messages,
temperature=0.7,
max_tokens=2048,
)
if result:
parsed = _parse_recommend_response(result, asset_ids, target_duration)
if parsed and len(parsed["clips"]) >= 2:
logger.info(
"豆包AI推荐生成成功: plan_id=%s clips=%d duration=%.1f confidence=%.2f has_analysis=%s",
plan_id,
len(parsed["clips"]),
parsed["total_duration"],
parsed["confidence"],
has_analysis,
)
return parsed
logger.warning("豆包AI推荐返回解析失败,降级到本地方案: %s", result[:100])
# 降级
return _fallback_recommend_clips(plan_id, template_id, asset_ids, editing_mode, target_duration)
# ── AI 封面生成 ──────────────────────────────────────────────────────────────
def _transfer_cover_frame_to_storage(frame_url: str, plan_id: str) -> str:
"""下载 MediaKit 帧图并上传到 OSS,返回公开可访问的 URL.
Args:
frame_url: MediaKit 返回的帧图 URL(内部/临时 URL)
plan_id: 剪辑计划 ID(用于生成存储路径)
Returns:
公开可访问的 URL;如果下载/上传失败则返回原始 URL
"""
import tempfile
import uuid
from pathlib import Path
try:
import httpx
# 下载帧图
logger.info("下载 MediaKit 帧图: plan_id=%s url=%s", plan_id, frame_url[:80])
resp = httpx.get(frame_url, timeout=30, follow_redirects=True)
resp.raise_for_status()
if not resp.content:
logger.warning("MediaKit 帧图下载为空,返回原始 URL")
return frame_url
# 写入临时文件
with tempfile.NamedTemporaryFile(suffix=".jpg", delete=False) as tmp:
tmp.write(resp.content)
tmp_path = tmp.name
# 上传到 OSS
from packages.shared.storage import get_shared_storage_service
storage = get_shared_storage_service()
cover_key = f"covers/{plan_id}/mediakit_frame_{uuid.uuid4().hex[:8]}.jpg"
storage.upload_file(
file_or_path=tmp_path,
storage_key=cover_key,
content_type="image/jpeg",
)
# 获取公开 URL
public_url = storage.get_url(cover_key)
logger.info("封面帧图已上传到 OSS: plan_id=%s key=%s url=%s", plan_id, cover_key, public_url[:80])
# 清理临时文件
Path(tmp_path).unlink(missing_ok=True)
return public_url
except Exception as e:
logger.warning("封面帧图转存失败,返回原始 URL: %s", str(e))
return frame_url
def _call_ai_cover_service(
plan_id: str,
asset_ids: list[str],
cover_type: str,
frame_time: float | None = None,
primary_video_url: str | None = None,
) -> dict[str, Any]:
"""调用 AI 封面生成服务.
统一封面管道下,封面已由渲染后视频抽帧生成并持久化到 GenerationTask.cover_url。
此函数仅处理 manual/upload 等需要前端交互的类型,
ai_frame/ai_regenerate 类型应由调用方直接从持久化的封面 URL 读取。
失败时抛出 RuntimeError。
Args:
plan_id: 剪辑计划 ID
asset_ids: 素材 ID 列表
cover_type: 封面类型
frame_time: 手动选帧时间点
primary_video_url: 主视频的可访问 URL
"""
if cover_type == "upload":
return {
"type": "upload",
"image_url": "",
"message": "请上传封面图片",
}
if cover_type == "manual" and frame_time is not None:
svg_placeholder = (
"data:image/svg+xml,"
"<svg xmlns='http://www.w3.org/2000/svg' width='1080' height='1920'>"
"<rect width='1080' height='1920' fill='#1a1a2e'/>"
"<text x='540' y='960' text-anchor='middle' fill='#e0e0e0' font-size='48' font-family='sans-serif'>手动选帧</text>"
"</svg>"
)
return {
"type": "manual",
"image_url": svg_placeholder,
"frame_time": frame_time,
}
# ai_frame / ai_regenerate: 封面应由渲染后视频抽帧管道生成
# 如果调用方传入了持久化的封面 URL,直接使用
logger.warning(
"封面生成回退: plan_id=%s cover_type=%s — 统一管道应已生成封面,请检查 GenerationTask.cover_url",
plan_id,
cover_type,
)
raise RuntimeError(f"封面数据不可用 (plan_id={plan_id})。请重新生成预览视频以触发封面自动提取。")
def run_ai_recommend(
plan_id: str,
template_id: str,
asset_ids: list[str],
editing_mode: str = "one_take",
target_duration: float = 30.0,
asset_analyses: Optional[dict[str, str]] = None,
) -> dict[str, Any]:
"""执行 AI 推荐片段方案
Args:
plan_id: 剪辑计划 ID
template_id: 模板 ID
asset_ids: 素材 ID 列表
editing_mode: 剪辑模式 (one_take / pip / voice_over / voice_pip)
target_duration: 目标时长(秒)
asset_analyses: 可选,{asset_id: 视频理解文本} 映射
Returns:
推荐方案 dict,包含 clips / config / total_duration / confidence
"""
logger.info(
"AI 推荐片段方案: plan_id=%s template_id=%s assets=%d mode=%s duration=%.1f has_analysis=%s",
plan_id,
template_id,
len(asset_ids),
editing_mode,
target_duration,
bool(asset_analyses),
)
result = _call_ai_recommend_service(
plan_id=plan_id,
template_id=template_id,
asset_ids=asset_ids,
editing_mode=editing_mode,
target_duration=target_duration,
asset_analyses=asset_analyses,
)
logger.info(
"AI 推荐完成: plan_id=%s clips=%d duration=%.1f confidence=%.2f",
plan_id,
len(result["clips"]),
result["total_duration"],
result["confidence"],
)
return result
def run_generate_cover(
plan_id: str,
asset_ids: list[str],
cover_type: str = "ai_frame",
frame_time: float | None = None,
primary_video_url: str | None = None,
) -> dict[str, Any]:
"""执行 AI 封面生成
Args:
plan_id: 剪辑计划 ID
asset_ids: 素材 ID 列表(用于确定视频来源)
cover_type: 封面类型 (ai_frame / manual / upload / ai_regenerate)
frame_time: 手动选帧时间点(仅 manual 模式使用)
primary_video_url: 主视频的可访问 URL(用于 MediaKit 抽帧)
Returns:
封面数据 dict,包含 type / image_url / frame_time
"""
logger.info(
"AI 封面生成: plan_id=%s type=%s assets=%d has_video_url=%s",
plan_id,
cover_type,
len(asset_ids),
bool(primary_video_url),
)
result = _call_ai_cover_service(
plan_id=plan_id,
asset_ids=asset_ids,
cover_type=cover_type,
frame_time=frame_time,
primary_video_url=primary_video_url,
)
logger.info(
"AI 封面生成完成: plan_id=%s type=%s url=%s",
plan_id,
result.get("type"),
result.get("image_url", "")[:60],
)
return result
# ── 通用 LLM / Vision 调用(#2039 ViralVideoOrchestrator 使用,复用现有豆包客户端)──
def call_llm(
prompt: str,
temperature: float = 0.7,
max_tokens: int = 2048,
model: str | None = None,
system_prompt: str | None = None,
timeout: int | None = None,
) -> object:
"""调用豆包大模型(文本对话),返回解析后的 JSON(dict/list)或原文字符串;失败返回 None。
Args:
prompt: 用户侧提示。
temperature: 采样温度。
max_tokens: 输出上限(结构化任务默认 2048,长文案可按需加大)。
model: 覆盖默认模型(如 fast_model 提速用),None 走配置默认推理模型。
system_prompt: 覆盖默认 system prompt。
"""
client = get_doubao_client()
if not client.is_available:
return None
if system_prompt is None:
system_prompt = "你是专业的短视频内容策划助手。需要结构化输出时请严格使用 JSON。"
messages = [
{"role": "system", "content": system_prompt},
{"role": "user", "content": prompt},
]
raw = client.chat_completion(messages, temperature=temperature, max_tokens=max_tokens, model=model, timeout=timeout)
if raw is None:
return None
try:
return json.loads(raw)
except (json.JSONDecodeError, TypeError):
return raw
def call_vision(
image_url: str,
prompt: str,
*,
model: str | None = None,
max_tokens: int = 1024,
temperature: float = 0.2,
timeout: int = 45,
system_prompt: str | None = None,
) -> object:
"""调用豆包视觉大模型分析图片,返回解析后的 JSON 或原文字符串;失败返回 None。
Args:
image_url: 可公网访问的图片 URL(直接传给豆包视觉模型,无需本地下载)。
prompt: 用户侧文本提示。
model: 覆盖默认视觉模型(如 vision_lite_model 提速用),None 走配置默认。
max_tokens: 输出上限,商品识别用 800~1200 足够,避免长输出拖慢首 token。
temperature: 温度。
timeout: 单次请求超时(秒)。
system_prompt: 覆盖默认 system prompt(viral-video 商品分析会传专门的详细 prompt)。
"""
client = get_doubao_client()
if not client.is_available:
logger.warning("[call_vision] 豆包客户端未配置 (DOUBAO_API_KEY 缺失)")
return None
if not image_url:
logger.warning("[call_vision] 空 image_url,跳过视觉分析")
return None
if system_prompt is None:
system_prompt = (
"你是资深电商视觉分析师。请严格基于用户提供的图片观察回答,"
"图片里没有的信息不要凭空想象或编造;看不清或无法判断时明确说"
"「无法判断」,不要猜测。输出必须是严格 JSON,不要附加 Markdown 或解释文字。"
)
messages = [
{"role": "system", "content": system_prompt},
{"role": "user", "content": prompt},
]
used_model = model or getattr(client, "vision_model", "?")
logger.info(
"[call_vision] 调用豆包视觉模型 model=%s image_url=%s prompt_len=%d max_tokens=%d timeout=%d",
used_model,
image_url[:120],
len(prompt),
max_tokens,
timeout,
)
raw = client.vision_completion(
messages=messages,
images=[image_url],
temperature=temperature,
max_tokens=max_tokens,
timeout=timeout,
model=model,
)
if raw is None:
logger.warning("[call_vision] 视觉模型返回 None (image_url=%s)", image_url[:80])
return None
logger.info("[call_vision] 视觉模型原始返回 (前400字): %s", raw[:400])
# 剥离 ```json ... ``` 包裹
stripped = raw.strip()
if stripped.startswith("```"):
stripped = stripped.strip("`")
if stripped.startswith("json"):
stripped = stripped[4:].lstrip()
try:
return json.loads(stripped)
except (json.JSONDecodeError, TypeError) as e:
logger.warning("[call_vision] JSON 解析失败(%s),返回原始文本: %s", e, raw[:200])
return raw
def preheat_trust_chain(portrait_descriptions: list[str], *, timeout: int = 120) -> list[str] | None:
"""#2174 信任链预热(t2i版):用 VLM 分析出的人物外貌描述,跑 Seedream 文生图,
生成的信任产物 URL 可传给 call_video_generation(pre_trusted_images=...)。
- portrait_descriptions: VLM输出的portrait_prompt列表(中文人物外貌描述)
- 成功返回与输入同序的信任图URL列表;任意一张失败返回None(调用方回退到纯t2v)
- 必须传VLM人物描述,不传reference_images,走纯t2i路径才是方舟信任产物
"""
client = get_doubao_client()
if not client.is_available:
return None
try:
return client.preheat_trust_chain(portrait_descriptions, timeout=timeout)
except Exception as e:
logger.error("[ai_service] preheat_trust_chain 异常: %s", e, exc_info=True)
return None
def call_video_generation(
prompt: str,
*,
image_url: str | None = None,
duration: int = 15,
ratio: str | None = "9:16",
resolution: str = "720p",
output_dir: str | None = None,
model: str | None = None,
generate_audio: bool = True,
reference_images: list[str] | None = None,
reference_audios: list[str] | None = None,
reference_videos: list[str] | None = None,
pre_trusted_images: list[str] | None = None,
) -> dict | None:
"""调用 Seedance / Wan 视频生成(v1.6.2 多模型版 + #2172 信任链预热)。
成功返回 {"video_path": str, "usage": dict | None}(usage 含 completion_tokens),失败返回 None。
失败时错误详情会写入 client.last_video_error,可通过 get_last_video_error() 读取:
{"error_code": str, "user_message": str, "status_code": int, "detail": str, ...}
"""
client = get_doubao_client()
if not client.is_available:
msg = "豆包客户端未配置(DOUBAO_API_KEY 缺失),跳过视频生成"
logger.warning("[ai_service] %s", msg)
# 写入 last_video_error 供上层读取
client.last_video_error = {
"error_code": "auth_error",
"user_message": "视频生成服务未配置,请联系管理员。",
"status_code": 0,
"detail": msg,
}
return None
effective_ratio = ratio or "9:16"
try:
kwargs: dict = dict(
prompt=prompt,
image_url=image_url,
duration=int(duration),
resolution=resolution,
generate_audio=bool(generate_audio),
watermark=False,
output_dir=output_dir,
model=model,
reference_images=reference_images,
reference_audios=reference_audios,
reference_videos=reference_videos,
pre_trusted_images=pre_trusted_images,
)
if effective_ratio:
kwargs["ratio"] = effective_ratio
return client.video_generation(**kwargs)
except Exception as e:
logger.error("[ai_service] call_video_generation 异常: %s", e, exc_info=True)
client.last_video_error = {
"error_code": "unknown",
"user_message": f"视频生成异常:{e!s}"[:200],
"status_code": 0,
"detail": str(e),
}
return None
def get_last_video_error() -> dict:
"""读取最近一次视频生成失败的详细错误(含 error_code/user_message/status_code/detail)。
成功或未调用过返回空 dict。
"""
try:
client = get_doubao_client()
return client.get_last_video_error() if hasattr(client, "get_last_video_error") else {}
except Exception:
return {}