TheM14
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294 lines
11 KiB
Python
294 lines
11 KiB
Python
"""ctypes bridge for the dependency-free MSVC C++ JOC DSP core.
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Metadata parsing intentionally stays in Python. One C call consumes a complete
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1536-sample frame, so Python is not involved in the hot 24-timeslot x 15-object
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DSP loops.
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"""
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from __future__ import annotations
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import ctypes
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import os
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from pathlib import Path
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import sys
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import numpy as np
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from evo_unpack import unpack_evolution
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from joc_decode import DC_FILTER_DMX_CONFIGS, dequantize, diff_decode, parse_joc
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FRAME_SAMPLES = 1536
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MAX_OBJECTS = 15
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MAX_DPOINTS = 2
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CORE_CHANNELS = 5
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MAX_BANDS = 23
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ABI_VERSION = 1
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class NativeBackendUnavailable(RuntimeError):
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pass
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def native_library_filename():
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if sys.platform == "win32":
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return "eac3joc_core.dll"
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if sys.platform == "darwin":
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return "libeac3joc_core.dylib"
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if sys.platform.startswith("linux"):
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return "libeac3joc_core.so"
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raise NativeBackendUnavailable(f"unsupported native platform: {sys.platform}")
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def _candidate_libraries():
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override = os.environ.get("EAC3JOC_NATIVE_LIBRARY")
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if override:
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yield Path(override).expanduser()
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root = Path(__file__).resolve().parent.parent
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yield root / "lib" / native_library_filename()
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def find_native_library(explicit=None):
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if explicit is not None:
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path = Path(explicit).expanduser().resolve()
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if not path.is_file():
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raise NativeBackendUnavailable(f"native library not found: {path}")
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return path
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checked = []
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for item in _candidate_libraries():
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path = item.resolve()
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checked.append(str(path))
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if path.is_file():
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return path
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raise NativeBackendUnavailable("native library not found; checked: " + "; ".join(checked))
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def default_native_threads():
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override = os.environ.get("EAC3JOC_NATIVE_THREADS")
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if override is not None:
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value = int(override)
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if value < 1:
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raise ValueError("EAC3JOC_NATIVE_THREADS must be at least 1")
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return min(value, MAX_OBJECTS)
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return 2 if (os.cpu_count() or 1) >= 4 else 1
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def _load_library(path):
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lib = ctypes.CDLL(str(path))
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float_p = ctypes.POINTER(ctypes.c_float)
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u8_p = ctypes.POINTER(ctypes.c_uint8)
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double_p = ctypes.POINTER(ctypes.c_double)
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lib.ejoc_abi_version.argtypes = []
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lib.ejoc_abi_version.restype = ctypes.c_uint32
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lib.ejoc_build_info.argtypes = []
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lib.ejoc_build_info.restype = ctypes.c_char_p
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lib.ejoc_renderer_create.argtypes = []
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lib.ejoc_renderer_create.restype = ctypes.c_void_p
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lib.ejoc_renderer_destroy.argtypes = [ctypes.c_void_p]
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lib.ejoc_renderer_destroy.restype = None
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lib.ejoc_renderer_reset.argtypes = [ctypes.c_void_p]
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lib.ejoc_renderer_reset.restype = ctypes.c_int
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lib.ejoc_renderer_set_threads.argtypes = [ctypes.c_void_p, ctypes.c_uint32]
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lib.ejoc_renderer_set_threads.restype = ctypes.c_int
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if hasattr(lib, "ejoc_renderer_set_dc_filter"):
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lib.ejoc_renderer_set_dc_filter.argtypes = [ctypes.c_void_p, ctypes.c_uint32]
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lib.ejoc_renderer_set_dc_filter.restype = ctypes.c_int
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lib.ejoc_renderer_thread_count.argtypes = [ctypes.c_void_p]
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lib.ejoc_renderer_thread_count.restype = ctypes.c_uint32
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lib.ejoc_renderer_last_error.argtypes = [ctypes.c_void_p]
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lib.ejoc_renderer_last_error.restype = ctypes.c_char_p
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lib.ejoc_renderer_process.argtypes = [
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ctypes.c_void_p,
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float_p,
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float_p,
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ctypes.c_uint32,
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u8_p,
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u8_p,
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u8_p,
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u8_p,
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double_p,
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ctypes.c_double,
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ctypes.c_float,
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ctypes.c_float,
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float_p,
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]
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lib.ejoc_renderer_process.restype = ctypes.c_int
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abi = int(lib.ejoc_abi_version())
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if abi != ABI_VERSION:
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raise NativeBackendUnavailable(f"native ABI mismatch: library={abi}, Python={ABI_VERSION}")
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return lib
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class NativeJocRenderer:
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"""Stateful whole-frame native DSP renderer with the Python renderer API shape."""
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def __init__(self, output_scale=1.0, library_path=None, threads=None):
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self.output_scale = np.float32(output_scale)
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if not np.isfinite(self.output_scale):
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raise ValueError("output_scale must be finite")
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self.library_path = find_native_library(library_path)
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self._lib = _load_library(self.library_path)
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self._handle = self._lib.ejoc_renderer_create()
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if not self._handle:
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raise MemoryError("ejoc_renderer_create failed")
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requested_threads = default_native_threads() if threads is None else int(threads)
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if requested_threads < 1:
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raise ValueError("threads must be at least 1")
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result = self._lib.ejoc_renderer_set_threads(self._handle, requested_threads)
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if result:
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self._raise_native("set_threads", result)
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self.threads = int(self._lib.ejoc_renderer_thread_count(self._handle))
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self._n_bands = np.zeros(MAX_OBJECTS, dtype=np.uint8)
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self._n_dpoints = np.zeros(MAX_OBJECTS, dtype=np.uint8)
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self._slope_idx = np.zeros(MAX_OBJECTS, dtype=np.uint8)
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self._offset_ts = np.zeros((MAX_OBJECTS, MAX_DPOINTS), dtype=np.uint8)
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self._dq = np.zeros(
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(MAX_OBJECTS, MAX_DPOINTS, CORE_CHANNELS, MAX_BANDS),
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dtype=np.float64,
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)
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self._output = np.zeros((16, FRAME_SAMPLES), dtype=np.float32)
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@property
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def build_info(self):
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value = self._lib.ejoc_build_info()
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return value.decode("utf-8", "replace") if value else ""
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@staticmethod
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def decode_payload(payload_bytes):
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subs, _ = unpack_evolution(payload_bytes, loose=True)
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return NativeJocRenderer.decode_subpayloads(subs)
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@staticmethod
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def decode_subpayloads(subs):
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if 14 not in subs:
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raise ValueError("EMDF missing ID14/JOC")
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out = parse_joc(subs[14])
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mix_q = diff_decode(out)
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mix_dq = dequantize(out, mix_q)
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return out, mix_q, mix_dq
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def reset(self):
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self._require_open()
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result = self._lib.ejoc_renderer_reset(self._handle)
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if result:
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self._raise_native("reset", result)
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def close(self):
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handle = getattr(self, "_handle", None)
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if handle:
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self._lib.ejoc_renderer_destroy(handle)
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self._handle = None
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc, tb):
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self.close()
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def __del__(self):
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try:
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self.close()
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except Exception:
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pass
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def _require_open(self):
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if not self._handle:
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raise RuntimeError("native renderer is closed")
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def _raise_native(self, operation, code):
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raw = self._lib.ejoc_renderer_last_error(self._handle)
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detail = raw.decode("utf-8", "replace") if raw else "unknown native error"
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raise RuntimeError(f"native {operation} failed ({code}): {detail}")
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def _pack_frame(self, out, mix_dq):
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if out["n_channels"] != CORE_CHANNELS:
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raise ValueError(f"native core requires 5 JOC channels, got {out['n_channels']}")
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if out["n_objects"] > MAX_OBJECTS:
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raise ValueError(f"native core supports at most 15 objects, got {out['n_objects']}")
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self._n_bands.fill(0)
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self._n_dpoints.fill(0)
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self._slope_idx.fill(0)
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self._offset_ts.fill(0)
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mask = 0
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for object_index, info in enumerate(out["objs"]):
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if not info["present"]:
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continue
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bands = int(info["n_bands"])
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points = int(info["n_dpoints"])
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if bands > MAX_BANDS or points > MAX_DPOINTS:
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raise ValueError(f"native descriptor out of range: bands={bands}, points={points}")
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values = np.asarray(mix_dq[object_index], dtype=np.float64)
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expected = (points, CORE_CHANNELS, bands)
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if values.shape != expected:
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raise ValueError(f"object {object_index} dq shape {values.shape}, expected {expected}")
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mask |= 1 << object_index
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self._n_bands[object_index] = bands
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self._n_dpoints[object_index] = points
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self._slope_idx[object_index] = int(info["slope_idx"])
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offsets = info.get("offset_ts", ())
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self._offset_ts[object_index, :len(offsets)] = offsets
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self._dq[object_index, :points, :, :bands] = values
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return mask
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def _set_dc_filter(self, dmx_config_idx):
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"""band-0 的 21-tap DC 补偿只在 downmix 配置 3/4 下启用。"""
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enabled = dmx_config_idx in DC_FILTER_DMX_CONFIGS
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setter = getattr(self._lib, "ejoc_renderer_set_dc_filter", None)
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if setter is None:
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if not enabled:
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raise RuntimeError(
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"native library has no ejoc_renderer_set_dc_filter; rebuild "
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"eac3joc_core to disable the band-0 DC filter for "
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f"dmx_config_idx={dmx_config_idx}")
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return
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result = setter(self._handle, 1 if enabled else 0)
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if result != 0:
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self._raise_native("set_dc_filter", result)
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def render_frame(self, payload_bytes, bed5_pcm, lfe_pcm=None):
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subs, _ = unpack_evolution(payload_bytes, loose=True)
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return self.render_subpayloads(subs, bed5_pcm, lfe_pcm)
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def render_subpayloads(self, subs, bed5_pcm, lfe_pcm=None):
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self._require_open()
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out, _, mix_dq = self.decode_subpayloads(subs)
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object_mask = self._pack_frame(out, mix_dq)
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self._set_dc_filter(out["dmx_config_idx"])
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bed5 = np.ascontiguousarray(bed5_pcm, dtype=np.float32)
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if bed5.shape != (CORE_CHANNELS, FRAME_SAMPLES):
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raise ValueError(f"core PCM shape must be (5,1536), got {bed5.shape}")
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if lfe_pcm is None:
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lfe = None
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lfe_ptr = ctypes.POINTER(ctypes.c_float)()
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else:
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lfe = np.ascontiguousarray(lfe_pcm, dtype=np.float32)
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if lfe.shape != (FRAME_SAMPLES,):
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raise ValueError(f"LFE shape must be (1536,), got {lfe.shape}")
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lfe_ptr = lfe.ctypes.data_as(ctypes.POINTER(ctypes.c_float))
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result = self._lib.ejoc_renderer_process(
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self._handle,
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bed5.ctypes.data_as(ctypes.POINTER(ctypes.c_float)),
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lfe_ptr,
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object_mask,
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self._n_bands.ctypes.data_as(ctypes.POINTER(ctypes.c_uint8)),
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self._n_dpoints.ctypes.data_as(ctypes.POINTER(ctypes.c_uint8)),
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self._slope_idx.ctypes.data_as(ctypes.POINTER(ctypes.c_uint8)),
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self._offset_ts.ctypes.data_as(ctypes.POINTER(ctypes.c_uint8)),
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self._dq.ctypes.data_as(ctypes.POINTER(ctypes.c_double)),
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float(out["clipgain"]),
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ctypes.c_float(0.0625),
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ctypes.c_float(self.output_scale),
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self._output.ctypes.data_as(ctypes.POINTER(ctypes.c_float)),
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)
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if result:
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self._raise_native("process", result)
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return self._output, None
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def native_available(library_path=None):
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try:
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path = find_native_library(library_path)
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lib = _load_library(path)
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return True, str(path), (lib.ejoc_build_info() or b"").decode("utf-8", "replace")
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except Exception as exc:
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return False, None, str(exc)
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