feat(design): 添加360视频和3D模型生成功能支持
- 在Design模型中新增video_url字段用于存储360度展示视频URL - 在DesignImage模型中新增model_3d_url字段用于存储3D模型URL - 设计路由新增生成视频接口，调用火山引擎即梦3.0 Pro API生成展示视频 - 设计路由新增生成3D模型接口，调用腾讯混元3D服务生成.glb格式3D模型 - 新增本地文件删除工具，支持强制重新生成时清理旧文件 - 设计响应Schema中添加video_url和model_3d_url字段支持前后端数据传递 - 前端设计详情页新增360度旋转3D模型展示区，支持生成、重新生成和下载3D模型 - 实现录制3D模型展示视频功能，支持捕获model-viewer旋转画面逐帧合成WebM文件下载 - 引入@google/model-viewer库作为3D模型Web组件展示支持 - 管理后台新增即梦视频生成和腾讯混元3D模型生成配置界面，方便服务密钥管理 - 前端API增加生成视频和生成3D模型接口请求方法，超时设置为10分钟以支持长时间处理 - 优化UI交互提示，新增生成中状态显示和错误提示，提升用户体验和操作反馈
This commit is contained in:
392
backend/app/services/ai_video_generator.py
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392
backend/app/services/ai_video_generator.py
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"""
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AI 视频生成服务
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使用火山引擎 即梦3.0 Pro (Jimeng Video 3.0 Pro) 将设计图生成 360 度旋转展示视频
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API 文档: https://www.volcengine.com/docs/85621/1777001
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认证方式: Volcengine V4 签名 (Access Key + Secret Key)
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API 端点: https://visual.volcengineapi.com
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"""
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import asyncio
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import base64
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import hashlib
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import hmac
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import io
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import json
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import logging
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import math
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import os
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import uuid
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from datetime import datetime, timezone
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from pathlib import Path
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from typing import Optional, List
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from urllib.parse import quote
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import httpx
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from PIL import Image
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from .config_service import get_config_value
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# 视频本地存储目录
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VIDEO_UPLOAD_DIR = Path(__file__).resolve().parent.parent.parent / "uploads" / "videos"
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VIDEO_UPLOAD_DIR.mkdir(parents=True, exist_ok=True)
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logger = logging.getLogger(__name__)
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# 火山引擎视觉 API 配置
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VISUAL_API_HOST = "visual.volcengineapi.com"
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VISUAL_API_URL = f"https://{VISUAL_API_HOST}"
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REGION = "cn-north-1"
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SERVICE = "cv"
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API_VERSION = "2022-08-31"
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# 即梦3.0 Pro req_key
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REQ_KEY_I2V = "jimeng_ti2v_v30_pro" # 支持传 image_urls 做图生视频
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# 超时与轮询配置
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SUBMIT_TIMEOUT = 30
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POLL_TIMEOUT = 15
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MAX_POLL_ATTEMPTS = 120 # 约 10 分钟
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POLL_INTERVAL = 5
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# ============================================================
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# Volcengine V4 签名实现
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# ============================================================
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def _sign(key: bytes, msg: str) -> bytes:
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return hmac.new(key, msg.encode("utf-8"), hashlib.sha256).digest()
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def _get_signature_key(secret_key: str, date_stamp: str, region: str, service: str) -> bytes:
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k_date = _sign(secret_key.encode("utf-8"), date_stamp)
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k_region = _sign(k_date, region)
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k_service = _sign(k_region, service)
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k_signing = _sign(k_service, "request")
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return k_signing
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def _build_signed_headers(
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access_key: str,
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secret_key: str,
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action: str,
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body: str,
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) -> dict:
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"""
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构建带 V4 签名的请求头
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参考: https://www.volcengine.com/docs/6369/67269
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"""
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now = datetime.now(timezone.utc)
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date_stamp = now.strftime("%Y%m%d")
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amz_date = now.strftime("%Y%m%dT%H%M%SZ")
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# 请求参数
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canonical_querystring = f"Action={quote(action, safe='')}&Version={quote(API_VERSION, safe='')}"
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# 规范请求头
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content_type = "application/json"
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canonical_headers = (
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f"content-type:{content_type}\n"
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f"host:{VISUAL_API_HOST}\n"
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f"x-date:{amz_date}\n"
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)
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signed_headers = "content-type;host;x-date"
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# Payload hash
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payload_hash = hashlib.sha256(body.encode("utf-8")).hexdigest()
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# 规范请求
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canonical_request = (
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f"POST\n"
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f"/\n"
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f"{canonical_querystring}\n"
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f"{canonical_headers}\n"
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f"{signed_headers}\n"
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f"{payload_hash}"
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)
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# 待签字符串
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credential_scope = f"{date_stamp}/{REGION}/{SERVICE}/request"
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string_to_sign = (
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f"HMAC-SHA256\n"
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f"{amz_date}\n"
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f"{credential_scope}\n"
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f"{hashlib.sha256(canonical_request.encode('utf-8')).hexdigest()}"
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)
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# 签名
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signing_key = _get_signature_key(secret_key, date_stamp, REGION, SERVICE)
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signature = hmac.new(signing_key, string_to_sign.encode("utf-8"), hashlib.sha256).hexdigest()
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# Authorization 头
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authorization = (
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f"HMAC-SHA256 "
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f"Credential={access_key}/{credential_scope}, "
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f"SignedHeaders={signed_headers}, "
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f"Signature={signature}"
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)
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return {
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"Content-Type": content_type,
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"Host": VISUAL_API_HOST,
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"X-Date": amz_date,
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"Authorization": authorization,
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}
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# ============================================================
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# 视频生成核心逻辑
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# ============================================================
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def _get_volc_keys() -> tuple:
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"""获取火山引擎 Access Key 和 Secret Key"""
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access_key = get_config_value("VOLC_ACCESS_KEY", "")
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secret_key = get_config_value("VOLC_SECRET_KEY", "")
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if not access_key or not secret_key:
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raise RuntimeError(
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"未配置 VOLC_ACCESS_KEY 或 VOLC_SECRET_KEY，无法使用即梦视频生成。"
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"请在管理后台 系统配置 中添加火山引擎 Access Key 和 Secret Key。"
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)
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return access_key, secret_key
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async def _merge_images_to_base64(image_urls: List[str]) -> str:
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"""
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下载多张图片并拼接为一张网格图，返回 base64 编码
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拼接策略:
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- 1张: 直接使用
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- 2张: 1×2 横向拼接
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- 3~4张: 2×2 网格拼接
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"""
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# 下载所有图片
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images = []
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async with httpx.AsyncClient(timeout=30, follow_redirects=True) as client:
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for url in image_urls:
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try:
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resp = await client.get(url)
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resp.raise_for_status()
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img = Image.open(io.BytesIO(resp.content)).convert("RGB")
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images.append(img)
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logger.info(f"下载图片成功: {url[:60]}... 尺寸={img.size}")
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except Exception as e:
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logger.warning(f"下载图片失败: {url[:60]}... {e}")
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if not images:
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raise RuntimeError("没有成功下载任何图片")
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# 只有1张时直接使用
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if len(images) == 1:
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merged = images[0]
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else:
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# 统一尺寸到最大尺寸
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max_w = max(img.width for img in images)
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max_h = max(img.height for img in images)
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# 计算网格布局
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n = len(images)
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if n == 2:
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cols, rows = 2, 1
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else:
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cols = 2
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rows = math.ceil(n / cols)
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# 创建拼接画布（白色背景）
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canvas_w = cols * max_w
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canvas_h = rows * max_h
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merged = Image.new("RGB", (canvas_w, canvas_h), (255, 255, 255))
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for idx, img in enumerate(images):
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r = idx // cols
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c = idx % cols
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# 居中放置
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x = c * max_w + (max_w - img.width) // 2
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y = r * max_h + (max_h - img.height) // 2
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merged.paste(img, (x, y))
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logger.info(f"图片拼接完成: {n}张 -> {cols}x{rows}网格, 尺寸={merged.size}")
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# 转 base64
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buf = io.BytesIO()
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merged.save(buf, format="JPEG", quality=90)
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b64 = base64.b64encode(buf.getvalue()).decode("utf-8")
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logger.info(f"拼接图 base64 长度: {len(b64)}")
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return b64
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async def generate_video(
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image_urls: List[str],
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prompt: str = "",
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duration_seconds: int = 5,
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) -> str:
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"""
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调用即梦3.0 Pro 生成 360 度旋转展示视频
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Args:
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image_urls: 多视角图片 URL 列表（取第一张作为首帧）
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prompt: 视频生成提示词
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duration_seconds: 预留参数（即梦目前固定帧数）
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Returns:
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生成的视频远程 URL
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Raises:
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RuntimeError: 视频生成失败
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"""
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access_key, secret_key = _get_volc_keys()
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logger.info(f"传入视频生成的图片数量: {len(image_urls)}")
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# 即梦API只支持单张图片输入，取第一张（正面效果图）作为基准
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first_url = image_urls[0]
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logger.info(f"使用第一张图片生成视频: {first_url[:80]}...")
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# 从配置读取默认 prompt
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if not prompt:
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prompt = get_config_value("VIDEO_PROMPT", "")
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if not prompt:
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prompt = (
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"玉雕作品在摄影棚内缓慢旋转360度展示全貌，"
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"专业珠宝摄影灯光，纯白色背景，平稳旋转，"
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"展示正面、侧面、背面各个角度，电影级画质"
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)
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# Step 1: 提交任务（只传第一张图片URL）
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task_id = await _submit_video_task(access_key, secret_key, first_url, prompt)
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logger.info(f"即梦视频生成任务已提交: task_id={task_id}")
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# Step 2: 轮询等待结果
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remote_video_url = await _poll_video_result(access_key, secret_key, task_id)
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logger.info(f"即梦视频生成完成: {remote_video_url[:80]}...")
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# Step 3: 下载视频到本地存储（即梦URL有效期约 1 小时，必须保存到本地）
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local_path = await _download_video_to_local(remote_video_url)
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logger.info(f"视频已保存到本地: {local_path}")
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return local_path
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async def _submit_video_task(
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access_key: str,
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secret_key: str,
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image_url: str,
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prompt: str,
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) -> str:
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"""提交图生视频任务到即梦3.0 Pro，使用单张图片URL"""
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action = "CVSync2AsyncSubmitTask"
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logger.info(f"提交即梦视频任务，图片URL: {image_url[:80]}...")
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payload = {
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"req_key": REQ_KEY_I2V,
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"prompt": prompt,
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"image_urls": [image_url],
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"seed": -1,
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"frames": int(get_config_value("VIDEO_FRAMES", "121")),
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"aspect_ratio": "1:1", # 玉雕展示用正方形
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}
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body = json.dumps(payload, ensure_ascii=False)
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headers = _build_signed_headers(access_key, secret_key, action, body)
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url = f"{VISUAL_API_URL}?Action={action}&Version={API_VERSION}"
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async with httpx.AsyncClient(timeout=SUBMIT_TIMEOUT) as client:
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resp = await client.post(url, content=body, headers=headers)
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if resp.status_code != 200:
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logger.error(f"即梦视频任务提交失败: status={resp.status_code}, body={resp.text[:500]}")
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resp.raise_for_status()
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data = resp.json()
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# 检查响应
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code = data.get("code", 0)
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if code != 10000:
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msg = data.get("message", "未知错误")
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raise RuntimeError(f"即梦视频任务提交失败 (code={code}): {msg}")
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task_id = data.get("data", {}).get("task_id")
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if not task_id:
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raise RuntimeError(f"即梦响应中未找到 task_id: {data}")
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return task_id
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async def _poll_video_result(
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access_key: str,
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secret_key: str,
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task_id: str,
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) -> str:
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"""轮询视频生成结果"""
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action = "CVSync2AsyncGetResult"
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payload = {
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"req_key": REQ_KEY_I2V,
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"task_id": task_id,
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}
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body = json.dumps(payload, ensure_ascii=False)
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for attempt in range(1, MAX_POLL_ATTEMPTS + 1):
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await asyncio.sleep(POLL_INTERVAL)
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# 每次轮询需要重新签名（时间戳不同）
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headers = _build_signed_headers(access_key, secret_key, action, body)
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url = f"{VISUAL_API_URL}?Action={action}&Version={API_VERSION}"
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try:
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async with httpx.AsyncClient(timeout=POLL_TIMEOUT) as client:
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resp = await client.post(url, content=body, headers=headers)
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if resp.status_code != 200:
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logger.warning(f"轮询即梦视频结果失败 (attempt={attempt}): status={resp.status_code}, body={resp.text[:300]}")
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continue
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data = resp.json()
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except Exception as e:
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logger.warning(f"轮询即梦视频异常 (attempt={attempt}): {e}")
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continue
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code = data.get("code", 0)
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task_data = data.get("data", {})
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status = task_data.get("status", "")
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if status == "done" and code == 10000:
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video_url = task_data.get("video_url", "")
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if video_url:
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return video_url
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raise RuntimeError(f"即梦视频生成完成但未找到 video_url: {data}")
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elif status == "done" and code != 10000:
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msg = data.get("message", "未知错误")
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raise RuntimeError(f"即梦视频生成失败 (code={code}): {msg}")
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elif status in ("not_found", "expired"):
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raise RuntimeError(f"即梦视频任务状态异常: {status}")
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else:
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# in_queue / generating
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if attempt % 6 == 0:
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logger.info(f"即梦视频生成中... (attempt={attempt}, status={status})")
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raise RuntimeError(f"即梦视频生成超时: 轮询 {MAX_POLL_ATTEMPTS} 次后仍未完成")
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async def _download_video_to_local(remote_url: str) -> str:
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"""
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下载远程视频到本地 uploads/videos/ 目录
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Returns:
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本地视频的 URL 路径，如 /uploads/videos/xxx.mp4
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"""
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filename = f"{uuid.uuid4().hex}.mp4"
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local_file = VIDEO_UPLOAD_DIR / filename
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try:
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async with httpx.AsyncClient(timeout=120, follow_redirects=True) as client:
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resp = await client.get(remote_url)
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resp.raise_for_status()
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local_file.write_bytes(resp.content)
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logger.info(f"视频下载完成: {len(resp.content)} 字节 -> {local_file}")
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except Exception as e:
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logger.error(f"视频下载失败: {e}")
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raise RuntimeError(f"视频下载失败: {e}")
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# 返回相对 URL 路径（和图片一样通过 /uploads/ 静态服务访问）
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return f"/uploads/videos/{filename}"
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