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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,161 @@ | ||
| # ========================================================================== # | ||
| # # | ||
| # KVMD - The main PiKVM daemon. # | ||
| # # | ||
| # Copyright (C) 2018-2022 Maxim Devaev <[email protected]> # | ||
| # # | ||
| # This program is free software: you can redistribute it and/or modify # | ||
| # it under the terms of the GNU General Public License as published by # | ||
| # the Free Software Foundation, either version 3 of the License, or # | ||
| # (at your option) any later version. # | ||
| # # | ||
| # This program is distributed in the hope that it will be useful, # | ||
| # but WITHOUT ANY WARRANTY; without even the implied warranty of # | ||
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | ||
| # GNU General Public License for more details. # | ||
| # # | ||
| # You should have received a copy of the GNU General Public License # | ||
| # along with this program. If not, see <https://www.gnu.org/licenses/>. # | ||
| # # | ||
| # ========================================================================== # | ||
|
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| import io | ||
| import ctypes | ||
| import ctypes.util | ||
| import contextlib | ||
| import warnings | ||
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| from ctypes import POINTER | ||
| from ctypes import Structure | ||
| from ctypes import c_int | ||
| from ctypes import c_bool | ||
| from ctypes import c_char_p | ||
| from ctypes import c_void_p | ||
| from ctypes import c_char | ||
|
|
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| from typing import List | ||
| from typing import Set | ||
| from typing import Generator | ||
| from typing import Optional | ||
|
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| from PIL import Image as PilImage | ||
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| from ...errors import OperationError | ||
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| from ... import libc | ||
| from ... import aiotools | ||
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| # ===== | ||
| class OcrError(OperationError): | ||
| pass | ||
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|
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| # ===== | ||
| class _TessBaseAPI(Structure): | ||
| pass | ||
|
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|
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| def _load_libtesseract() -> Optional[ctypes.CDLL]: | ||
| try: | ||
| path = ctypes.util.find_library("tesseract") | ||
| if not path: | ||
| raise RuntimeError("Can't find libtesseract") | ||
| lib = ctypes.CDLL(path) | ||
| for (name, restype, argtypes) in [ | ||
| ("TessBaseAPICreate", POINTER(_TessBaseAPI), []), | ||
| ("TessBaseAPIInit3", c_int, [POINTER(_TessBaseAPI), c_char_p, c_char_p]), | ||
| ("TessBaseAPISetImage", None, [POINTER(_TessBaseAPI), c_void_p, c_int, c_int, c_int, c_int]), | ||
| ("TessBaseAPIGetUTF8Text", POINTER(c_char), [POINTER(_TessBaseAPI)]), | ||
| ("TessBaseAPISetVariable", c_bool, [POINTER(_TessBaseAPI), c_char_p, c_char_p]), | ||
| ("TessBaseAPIGetAvailableLanguagesAsVector", POINTER(POINTER(c_char)), [POINTER(_TessBaseAPI)]), | ||
| ]: | ||
| func = getattr(lib, name) | ||
| if not func: | ||
| raise RuntimeError(f"Can't find libtesseract.{name}") | ||
| setattr(func, "restype", restype) | ||
| setattr(func, "argtypes", argtypes) | ||
| return lib | ||
| except Exception as err: | ||
| warnings.warn(f"Can't load libtesseract: {err}", RuntimeWarning) | ||
| return None | ||
|
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|
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| _libtess = _load_libtesseract() | ||
|
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| @contextlib.contextmanager | ||
| def _tess_api(langs: List[str]) -> Generator[_TessBaseAPI, None, None]: | ||
| if not _libtess: | ||
| raise OcrError("Tesseract is not available") | ||
| api = _libtess.TessBaseAPICreate() | ||
| try: | ||
| if _libtess.TessBaseAPIInit3(api, None, "+".join(langs).encode()) != 0: | ||
| raise OcrError("Can't initialize Tesseract") | ||
| if not _libtess.TessBaseAPISetVariable(api, b"debug_file", b"/dev/null"): | ||
| raise OcrError("Can't set debug_file=/dev/null") | ||
| yield api | ||
| finally: | ||
| _libtess.TessBaseAPIDelete(api) | ||
|
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|
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| # ===== | ||
| class TesseractOcr: | ||
| def __init__(self, default_langs: List[str]) -> None: | ||
| self.__default_langs = default_langs | ||
|
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| def is_available(self) -> bool: | ||
| return bool(_libtess) | ||
|
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| async def get_default_langs(self) -> List[str]: | ||
| return list(self.__default_langs) | ||
|
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| async def get_available_langs(self) -> List[str]: | ||
| return (await aiotools.run_async(self.__inner_get_available_langs)) | ||
|
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| def __inner_get_available_langs(self) -> List[str]: | ||
| with _tess_api(["osd"]) as api: | ||
| assert _libtess | ||
| langs: Set[str] = set() | ||
| langs_ptr = _libtess.TessBaseAPIGetAvailableLanguagesAsVector(api) | ||
| if langs_ptr is not None: | ||
| index = 0 | ||
| while langs_ptr[index]: | ||
| lang = ctypes.cast(langs_ptr[index], c_char_p).value | ||
| if lang is not None: | ||
| langs.add(lang.decode()) | ||
| libc.free(langs_ptr[index]) | ||
| index += 1 | ||
| libc.free(langs_ptr) | ||
| return sorted(langs) | ||
|
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| async def recognize(self, data: bytes, langs: List[str], left: int, top: int, right: int, bottom: int) -> str: | ||
| if not langs: | ||
| langs = self.__default_langs | ||
| return (await aiotools.run_async(self.__inner_recognize, data, langs, left, top, right, bottom)) | ||
|
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| def __inner_recognize(self, data: bytes, langs: List[str], left: int, top: int, right: int, bottom: int) -> str: | ||
| with _tess_api(langs) as api: | ||
| assert _libtess | ||
| with io.BytesIO(data) as bio: | ||
| with PilImage.open(bio) as image: | ||
| if left >= 0 or top >= 0 or right >= 0 or bottom >= 0: | ||
| left = (0 if left < 0 else min(image.width, left)) | ||
| top = (0 if top < 0 else min(image.height, top)) | ||
| right = (image.width if right < 0 else min(image.width, right)) | ||
| bottom = (image.height if bottom < 0 else min(image.height, bottom)) | ||
| if left < right and top < bottom: | ||
| image.crop((left, top, right, bottom)) | ||
|
|
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| _libtess.TessBaseAPISetImage(api, image.tobytes("raw", "RGB"), image.width, image.height, 3, image.width * 3) | ||
| text_ptr = None | ||
| try: | ||
| text_ptr = _libtess.TessBaseAPIGetUTF8Text(api) | ||
| text = ctypes.cast(text_ptr, c_char_p).value | ||
| if text is None: | ||
| raise OcrError("Can't recognize image") | ||
| return text.decode("utf-8") | ||
| finally: | ||
| if text_ptr is not None: | ||
| libc.free(text_ptr) |
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