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@@ -8,8 +8,9 @@ from PIL import Image
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from mineru.data.data_reader_writer import FileBasedDataWriter
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from mineru.utils.pdf_reader import image_to_b64str, image_to_bytes, page_to_image
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-from .enum_class import ImageType
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-from .hash_utils import str_sha256
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+from mineru.utils.enum_class import ImageType
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+from mineru.utils.hash_utils import str_sha256
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+from mineru.utils.pdf_page_id import get_end_page_id
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from concurrent.futures import ProcessPoolExecutor, TimeoutError as FuturesTimeoutError
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@@ -36,7 +37,7 @@ def pdf_page_to_image(page: pdfium.PdfPage, dpi=200, image_type=ImageType.PIL) -
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return image_dict
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-#@todo 通过多进程渲染pdf提速
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+
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def _load_images_from_pdf_worker(pdf_bytes, dpi, start_page_id, end_page_id, image_type):
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"""用于进程池的包装函数"""
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return load_images_from_pdf_core(pdf_bytes, dpi, start_page_id, end_page_id, image_type)
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@@ -49,30 +50,74 @@ def load_images_from_pdf(
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end_page_id=None,
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image_type=ImageType.PIL,
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timeout=300,
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+ threads=4,
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):
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- """带超时控制的 PDF 转图片函数
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+ """带超时控制的 PDF 转图片函数,支持多进程加速
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Args:
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timeout (int): 超时时间(秒),默认 300 秒
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+ threads (int): 进程数,默认 4
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Raises:
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TimeoutError: 当转换超时时抛出
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"""
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- with ProcessPoolExecutor(max_workers=1) as executor:
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- future = executor.submit(
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- _load_images_from_pdf_worker,
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- pdf_bytes,
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- dpi,
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- start_page_id,
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- end_page_id,
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- image_type
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- )
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+ # 根据进程数调整超时时间
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+ timeout = timeout // threads
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+
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+ pdf_doc = pdfium.PdfDocument(pdf_bytes)
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+ end_page_id = get_end_page_id(end_page_id, len(pdf_doc))
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+
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+ # 计算总页数
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+ total_pages = end_page_id - start_page_id + 1
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+
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+ # 实际使用的进程数不超过总页数
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+ actual_threads = min(threads, total_pages)
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+
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+ # 根据实际进程数分组页面范围
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+ pages_per_thread = max(1, total_pages // actual_threads)
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+ page_ranges = []
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+
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+ for i in range(actual_threads):
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+ range_start = start_page_id + i * pages_per_thread
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+ if i == actual_threads - 1:
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+ # 最后一个线程处理剩余所有页面
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+ range_end = end_page_id
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+ else:
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+ range_end = min(start_page_id + (i + 1) * pages_per_thread - 1, end_page_id)
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+
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+ page_ranges.append((range_start, range_end))
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+
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+ with ProcessPoolExecutor(max_workers=actual_threads) as executor:
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+ # 提交所有任务
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+ futures = []
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+ for range_start, range_end in page_ranges:
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+ future = executor.submit(
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+ _load_images_from_pdf_worker,
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+ pdf_bytes,
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+ dpi,
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+ range_start,
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+ range_end,
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+ image_type
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+ )
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+ futures.append((range_start, future))
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+
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try:
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- images_list = future.result(timeout=timeout)
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- pdf_doc = pdfium.PdfDocument(pdf_bytes)
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+ # 收集结果并按页码排序
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+ all_results = []
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+ for range_start, future in futures:
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+ images_list = future.result(timeout=timeout)
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+ all_results.append((range_start, images_list))
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+
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+ # 按起始页码排序并合并结果
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+ all_results.sort(key=lambda x: x[0])
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+ images_list = []
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+ for _, imgs in all_results:
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+ images_list.extend(imgs)
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+
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return images_list, pdf_doc
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except FuturesTimeoutError:
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logger.error(f"PDF conversion timeout after {timeout}s")
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+ pdf_doc.close()
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executor.shutdown(wait=False, cancel_futures=True)
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raise TimeoutError(f"PDF to images conversion timeout after {timeout}s")
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@@ -87,10 +132,7 @@ def load_images_from_pdf_core(
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images_list = []
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pdf_doc = pdfium.PdfDocument(pdf_bytes)
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pdf_page_num = len(pdf_doc)
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- end_page_id = end_page_id if end_page_id is not None and end_page_id >= 0 else pdf_page_num - 1
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- if end_page_id > pdf_page_num - 1:
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- logger.warning("end_page_id is out of range, use images length")
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- end_page_id = pdf_page_num - 1
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+ end_page_id = get_end_page_id(end_page_id, pdf_page_num)
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for index in range(0, pdf_page_num):
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if start_page_id <= index <= end_page_id:
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@@ -98,6 +140,8 @@ def load_images_from_pdf_core(
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image_dict = pdf_page_to_image(page, dpi=dpi, image_type=image_type)
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images_list.append(image_dict)
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+ pdf_doc.close()
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+
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return images_list
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