小鱼开发
150 lines
6.2 KiB
Python
150 lines
6.2 KiB
Python
"""
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Subtitle 任务处理器
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==================
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管理火山引擎字幕生成与自动打轴的提交与轮询。
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支持两种模式：
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- caption: 字幕识别（从音频/视频提取带时间轴的字幕）
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- auto_align: 自动打轴（为已有字幕文本配上时间轴）
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"""
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import logging
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from typing import Any
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from app.scheduler.handlers.base import AsyncHandler
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from app.scheduler.models import StateChange
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from app.scheduler.registry import TaskRegistry
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from app.scheduler.slot_manager import SlotManager
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from app.services.volcengine_caption_service import VolcengineCaptionService
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logger = logging.getLogger(__name__)
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SLOT_KEY = "volc:subtitle_slots"
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MAX_SLOTS = 5
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class SubtitleHandler(AsyncHandler):
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name = "subtitle"
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slot_key = SLOT_KEY
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max_slots = MAX_SLOTS
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def __init__(self, service: VolcengineCaptionService | None = None):
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self.service = service
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def _get_service(self) -> VolcengineCaptionService:
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if self.service is None:
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self.service = VolcengineCaptionService()
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return self.service
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async def tick(
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self, jobs: list[Any], registry: TaskRegistry, slots: SlotManager
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) -> list[StateChange]:
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changes: list[StateChange] = []
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for task in jobs:
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params = task.params or {}
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mode = params.get("mode", "caption")
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volc_task_id = params.get("volc_task_id")
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project_id = params.get("project_id", "")
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video_path = params.get("video", params.get("video_path", ""))
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language = params.get("language", "zh")
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audio_text = params.get("audio_text", "")
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if volc_task_id:
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# 轮询
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try:
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service = self._get_service()
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if mode == "auto_align":
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result = await service.query_auto_align_task(volc_task_id, blocking=False)
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else:
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result = await service.query_caption_task(volc_task_id, blocking=False)
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if result.code == 0:
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utterances = result.utterances or []
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result_data = {
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"project_id": project_id,
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"video_path": video_path,
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"language": language,
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"mode": mode,
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"duration": result.duration,
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"utterances": [
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{
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"text": u.text,
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"start_time": u.start_time,
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"end_time": u.end_time,
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}
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for u in utterances
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],
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}
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await slots.release(SLOT_KEY, task.task_id)
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changes.append(
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StateChange(task_id=task.task_id, field_path="status", value="completed")
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)
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changes.append(
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StateChange(
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task_id=task.task_id, field_path="message", value="字幕生成完成"
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)
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)
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changes.append(
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StateChange(task_id=task.task_id, field_path="completed", value=1)
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)
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changes.append(StateChange(task_id=task.task_id, field_path="total", value=1))
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changes.append(
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StateChange(task_id=task.task_id, field_path="result", value=result_data)
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)
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elif result.code != 2000:
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await slots.release(SLOT_KEY, task.task_id)
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changes.append(
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StateChange(task_id=task.task_id, field_path="status", value="failed")
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)
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changes.append(
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StateChange(
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task_id=task.task_id,
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field_path="message",
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value=f"字幕识别失败: {result.message}",
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)
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)
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changes.append(
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StateChange(task_id=task.task_id, field_path="error", value=result.message)
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)
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except Exception as e:
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logger.error(f"[Subtitle {task.task_id}] poll error: {e}")
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continue
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# 提交
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acquired = await slots.acquire(SLOT_KEY, task.task_id, MAX_SLOTS)
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if not acquired:
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continue
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try:
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service = VolcengineCaptionService()
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if mode == "auto_align":
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if not audio_text:
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raise ValueError("auto_align 模式需要提供 audio_text")
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volc_task_id = await service.submit_auto_align_task(
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audio_url=video_path,
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audio_text=audio_text,
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)
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else:
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volc_task_id = await service.submit_caption_task(
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audio_url=video_path, language=language
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)
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if not volc_task_id:
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raise ValueError("未返回任务ID")
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params["volc_task_id"] = volc_task_id
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changes.append(StateChange(task_id=task.task_id, field_path="params", value=params))
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changes.append(
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StateChange(task_id=task.task_id, field_path="message", value="字幕任务已提交")
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)
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except Exception as e:
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await slots.release(SLOT_KEY, task.task_id)
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changes.append(StateChange(task_id=task.task_id, field_path="status", value="failed"))
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changes.append(
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StateChange(task_id=task.task_id, field_path="message", value=str(e)[:200])
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)
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changes.append(
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StateChange(task_id=task.task_id, field_path="error", value=str(e)[:500])
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)
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return changes
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