402 lines
14 KiB
Python
402 lines
14 KiB
Python
from __future__ import annotations
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import contextlib
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import hashlib
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import importlib
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import logging
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import os
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any, Iterator, Literal, NamedTuple
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import torch
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from .attention import validate_attention_backend
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from .audiotools_compat import audiotools_import_compatibility
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from .torchcodec_compat import torchcodec_import_compatibility
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from .xformers_compat import xformers_import_compatibility
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LOGGER = logging.getLogger(__name__)
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OFFICIAL_MODELS = (
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"facebook/sam-audio-small",
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"facebook/sam-audio-base",
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"facebook/sam-audio-large",
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"facebook/sam-audio-small-tv",
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"facebook/sam-audio-base-tv",
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"facebook/sam-audio-large-tv",
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)
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MODEL_FOLDER = "sam_audio"
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MODEL_FILES = ("config.json", "checkpoint.pt")
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MIRROR_MARKER = ".verified-mirror-checkpoint"
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@dataclass(frozen=True)
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class MirrorSpec:
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repo_id: str
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revision: str
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checkpoint_size: int
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checkpoint_sha256: str
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# Each mirror revision is immutable, includes Meta's SAM License, and was checked
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# against the corresponding facebook checkpoint.pt LFS SHA-256 on 2026-08-23.
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MIRROR_MODELS = {
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"facebook/sam-audio-small": MirrorSpec(
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"mrfakename/sam-audio-small",
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"682824171fd5cfec47b88687f583a11050c1bf1d",
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5_100_547_943,
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"8c44fda9821fd9f2ec8977304e3c0f55290d9eacb6bbf25b4b8fb1f69c2a8c06",
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),
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"facebook/sam-audio-base": MirrorSpec(
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"mrfakename/sam-audio-base",
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"351f6666d46357edea2149a338a680fcd0d7afdd",
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7_725_405_659,
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"b5f3e29ea7a9e80e90a00da495a8aafe890571f371c4bfb88c052c65a5636839",
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),
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"facebook/sam-audio-large": MirrorSpec(
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"mrfakename/sam-audio-large",
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"497809f191dd4f673a2c93557176387cf2a06cf2",
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14_861_356_211,
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"ca55418b1d23e8c8a4dcc55f259d9801c8f79da0131a66e525d862c1289e3c4f",
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),
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"facebook/sam-audio-small-tv": MirrorSpec(
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"mrfakename/sam-audio-small-tv",
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"2fee00b2836ede05fce503726ac9f908b1fc4aa9",
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5_100_547_943,
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"1a9693b235efc3176986664dac349eb64022c7468cf8d4195954490a2457e6a9",
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),
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"facebook/sam-audio-base-tv": MirrorSpec(
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"mrfakename/sam-audio-base-tv",
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"ed6a64b2d3c6151276d81783becb8881d75efe4f",
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7_725_405_659,
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"569e3fecdefe267047b02d117acb5a67c03d2f73c4943d3d8bd43df9e9b9148d",
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),
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"facebook/sam-audio-large-tv": MirrorSpec(
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"mrfakename/sam-audio-large-tv",
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"30eea7c915f43349f3b3f5c7e33e8658a01d7253",
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14_861_356_211,
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"90e047269238c498c5abe0da6e6ba40859d152111d4a09f582a209027a33b72f",
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),
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}
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class SpanPrompt(NamedTuple):
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token: Literal["+", "-"]
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start: float
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end: float
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@dataclass
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class SAMAudioPipeline:
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model: torch.nn.Module
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processor: Any
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patcher: Any
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device: torch.device
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source: str
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attention_backend: str = "pytorch"
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def get_models(self) -> list[Any]:
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"""Let ComfyUI track this model for the lifetime of the prompt."""
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return [self.patcher]
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def load(self, model_management: Any) -> None:
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model_management.load_models_gpu([self.patcher], force_full_load=True)
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self.model.eval()
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def register_model_folder(folder_paths: Any) -> Path:
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model_dir = Path(folder_paths.models_dir) / MODEL_FOLDER
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try:
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folder_paths.add_model_folder_path(
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MODEL_FOLDER, str(model_dir), is_default=True
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)
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except TypeError:
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# ComfyUI versions before is_default support still accept the two-argument form.
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folder_paths.add_model_folder_path(MODEL_FOLDER, str(model_dir))
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return model_dir
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def _is_model_directory(path: Path) -> bool:
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return path.is_dir() and all((path / name).is_file() for name in MODEL_FILES)
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def discover_local_models(folder_paths: Any) -> dict[str, Path]:
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"""Return stable UI labels for valid model directories in every configured root."""
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discovered: list[tuple[str, Path]] = []
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official_directory_names = {name.rsplit("/", 1)[-1] for name in OFFICIAL_MODELS}
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for raw_root in folder_paths.get_folder_paths(MODEL_FOLDER):
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root = Path(raw_root)
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if not root.is_dir():
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continue
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for current, directories, files in os.walk(root):
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current_path = Path(current)
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if all(name in files for name in MODEL_FILES):
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if current_path.parent == root and current_path.name in official_directory_names:
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directories[:] = []
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continue
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relative = current_path.relative_to(root).as_posix()
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label = relative if relative != "." else current_path.name
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discovered.append((f"local/{label}", current_path))
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directories[:] = []
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continue
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directories[:] = [
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name
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for name in directories
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if not name.startswith(".") and name != "__pycache__"
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]
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counts: dict[str, int] = {}
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result: dict[str, Path] = {}
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for label, path in sorted(discovered, key=lambda item: (item[0].lower(), str(item[1]))):
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counts[label] = counts.get(label, 0) + 1
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unique_label = label if counts[label] == 1 else f"{label} [{counts[label]}]"
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result[unique_label] = path
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return result
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def model_choices(folder_paths: Any) -> list[str]:
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return [*OFFICIAL_MODELS, *discover_local_models(folder_paths).keys()]
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def _is_gate_error(error: Exception) -> bool:
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"""Recognize Hugging Face gated/authorization failures across hub versions."""
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current: BaseException | None = error
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visited: set[int] = set()
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while current is not None and id(current) not in visited:
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visited.add(id(current))
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if type(current).__name__ == "GatedRepoError":
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return True
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response = getattr(current, "response", None)
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if getattr(response, "status_code", None) in (401, 403):
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return True
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current = current.__cause__ or current.__context__
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return False
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def _checkpoint_sha256(path: Path) -> str:
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digest = hashlib.sha256()
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with path.open("rb") as checkpoint:
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for chunk in iter(lambda: checkpoint.read(8 * 1024 * 1024), b""):
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digest.update(chunk)
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return digest.hexdigest()
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def _verify_mirror_checkpoint(destination: Path, spec: MirrorSpec) -> None:
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checkpoint = destination / "checkpoint.pt"
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marker = destination / MIRROR_MARKER
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expected_marker = f"{spec.checkpoint_size} {spec.checkpoint_sha256}\n"
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if (
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marker.is_file()
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and marker.read_text(encoding="utf-8") == expected_marker
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and checkpoint.stat().st_size == spec.checkpoint_size
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):
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return
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actual_size = checkpoint.stat().st_size
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if actual_size != spec.checkpoint_size:
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raise RuntimeError(
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f"Mirror checkpoint size mismatch for {spec.repo_id}: expected "
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f"{spec.checkpoint_size} bytes, received {actual_size}"
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)
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actual_hash = _checkpoint_sha256(checkpoint)
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if actual_hash != spec.checkpoint_sha256:
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raise RuntimeError(
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f"Mirror checkpoint checksum mismatch for {spec.repo_id}; refusing to load it"
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)
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marker.write_text(expected_marker, encoding="utf-8")
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def _download_mirror_model(
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huggingface_hub: Any,
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destination: Path,
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spec: MirrorSpec,
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) -> Path:
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marker = destination / MIRROR_MARKER
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marker.write_text(f"pending {spec.checkpoint_sha256}\n", encoding="utf-8")
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snapshot = huggingface_hub.snapshot_download(
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repo_id=spec.repo_id,
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revision=spec.revision,
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local_dir=str(destination),
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allow_patterns=[*MODEL_FILES, "LICENSE"],
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)
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path = Path(snapshot)
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if not _is_model_directory(path) or not (path / "LICENSE").is_file():
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raise RuntimeError(
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f"The mirror snapshot for {spec.repo_id} is incomplete; expected "
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"config.json, checkpoint.pt, and LICENSE"
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)
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_verify_mirror_checkpoint(path, spec)
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return path
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def _download_official_model(repo_id: str, model_root: Path) -> Path:
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destination = model_root / repo_id.rsplit("/", 1)[-1]
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if _is_model_directory(destination):
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marker = destination / MIRROR_MARKER
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if marker.exists() and (destination / "LICENSE").is_file():
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_verify_mirror_checkpoint(destination, MIRROR_MODELS[repo_id])
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return destination
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if not marker.exists():
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return destination
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destination.mkdir(parents=True, exist_ok=True)
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try:
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huggingface_hub = importlib.import_module("huggingface_hub")
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except Exception as error:
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raise RuntimeError(
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"huggingface-hub is required to download SAM-Audio checkpoints; "
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"run this node's install.py and restart ComfyUI"
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) from error
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try:
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snapshot = huggingface_hub.snapshot_download(
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repo_id=repo_id,
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local_dir=str(destination),
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allow_patterns=list(MODEL_FILES),
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)
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except Exception as error:
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if _is_gate_error(error):
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spec = MIRROR_MODELS[repo_id]
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LOGGER.warning(
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"Access to %s was gated; downloading checksum-verified mirror %s",
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repo_id,
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spec.repo_id,
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)
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try:
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return _download_mirror_model(huggingface_hub, destination, spec)
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except Exception as mirror_error:
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raise RuntimeError(
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f"Access to {repo_id} was denied and its verified public mirror "
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f"{spec.repo_id} could not be downloaded"
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) from mirror_error
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raise RuntimeError(
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f"Could not download {repo_id}. Accept the model license at "
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f"https://huggingface.co/{repo_id}, run `hf auth login` in ComfyUI's "
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"Python environment, and retry."
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) from error
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path = Path(snapshot)
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if not _is_model_directory(path):
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raise RuntimeError(
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f"The downloaded snapshot for {repo_id} is incomplete; expected "
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f"{', '.join(MODEL_FILES)} in {path}"
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)
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(path / MIRROR_MARKER).unlink(missing_ok=True)
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return path
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def resolve_model(model_name: str, folder_paths: Any) -> Path:
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local_models = discover_local_models(folder_paths)
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if model_name in local_models:
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return local_models[model_name]
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if model_name not in OFFICIAL_MODELS:
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raise ValueError(
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f"Unknown SAM-Audio model {model_name!r}. Refresh the browser after adding local models."
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)
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model_root = register_model_folder(folder_paths)
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return _download_official_model(model_name, model_root)
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def import_sam_audio() -> tuple[Any, Any]:
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try:
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LOGGER.info(
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"Loading SAM-Audio through isolated inference-only compatibility layers"
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)
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with (
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xformers_import_compatibility(),
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audiotools_import_compatibility(),
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torchcodec_import_compatibility(),
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):
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module = importlib.import_module("sam_audio")
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return module.SAMAudio, module.SAMAudioProcessor
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except Exception as error:
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raise RuntimeError(
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"SAM-Audio could not be imported. Install this node's requirements with "
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"ComfyUI's Python interpreter, then restart ComfyUI."
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) from error
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def load_pipeline(
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model_name: str,
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folder_paths: Any,
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model_management: Any,
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model_patcher: Any,
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attention_backend: str = "pytorch",
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) -> SAMAudioPipeline:
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load_device = model_management.get_torch_device()
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validate_attention_backend(attention_backend, load_device)
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model_path = resolve_model(model_name, folder_paths)
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SAMAudio, SAMAudioProcessor = import_sam_audio()
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LOGGER.info("Loading SAM-Audio model from %s", model_path)
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try:
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model = SAMAudio.from_pretrained(
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str(model_path),
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map_location="cpu",
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strict=False,
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text_ranker=None,
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visual_ranker=None,
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)
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processor = SAMAudioProcessor.from_pretrained(str(model_path))
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except Exception as error:
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raise RuntimeError(
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f"Failed to load SAM-Audio from {model_path}. Upstream may also need its "
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"T5, Perception Encoder, and ranker assets available through Hugging Face."
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) from error
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model = model.eval()
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# BaseModel exposes device() as a method, while ComfyUI's ModelPatcher tracks
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# residency through a mutable model.device attribute. Upstream does not call
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# that helper internally, so adopting ComfyUI's convention is safe here.
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model.device = torch.device("cpu")
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offload_device = model_management.unet_offload_device()
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patcher = model_patcher.ModelPatcher(
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model, load_device=load_device, offload_device=offload_device
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)
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return SAMAudioPipeline(
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model=model,
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processor=processor,
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patcher=patcher,
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device=load_device,
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source=model_name,
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attention_backend=attention_backend,
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)
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def ode_options(inference_steps: int) -> dict[str, Any]:
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if inference_steps < 2 or inference_steps % 2:
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raise ValueError("inference_steps must be an even integer of at least 2")
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return {"method": "midpoint", "options": {"step_size": 2.0 / inference_steps}}
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@contextlib.contextmanager
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def seeded_inference(seed: int, device: torch.device) -> Iterator[None]:
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cuda_devices: list[int] = []
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if device.type == "cuda" and torch.cuda.is_available():
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cuda_devices = [device.index if device.index is not None else torch.cuda.current_device()]
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with torch.random.fork_rng(devices=cuda_devices):
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torch.manual_seed(seed)
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if device.type == "cuda" and torch.cuda.is_available():
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torch.cuda.manual_seed_all(seed)
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yield
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def validate_spans(spans: tuple[SpanPrompt, ...], duration: float) -> None:
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if not spans:
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raise ValueError("At least one span prompt is required")
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if not any(span.token == "+" for span in spans):
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raise ValueError("At least one positive span is required")
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for span in spans:
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if span.start < 0 or span.end <= span.start:
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raise ValueError(
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f"Invalid span {span.start:g}-{span.end:g}: end must be after start"
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)
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if span.end > duration + 1e-6:
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raise ValueError(
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f"Span ends at {span.end:g}s but the input audio is only {duration:.3f}s"
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)
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