Remove redundant/unused lines

Author: caffeinism

av/video/frame.py

@@ -15,7 +15,7 @@
     PyCapsule_IsValid,
     PyCapsule_SetName,
 )
-from cython.cimports.cpython.ref import Py_DECREF, Py_INCREF, PyObject
+from cython.cimports.cpython.ref import Py_DECREF, Py_INCREF
 from cython.cimports.dlpack import DLManagedTensor, kDLCPU, kDLCUDA, kDLUInt
 from cython.cimports.libc.stdint import int64_t, uint8_t
 
@@ -1412,8 +1412,6 @@ def from_dlpack(
             if dev0 != dev1:
                 raise ValueError("plane tensors must be on the same CUDA device")
             if dev_type0 == kDLCUDA:
-                if dev0 != dev1:
-                    raise ValueError("plane tensors must be on the same CUDA device")
                 if device_id is None:
                     device_id = dev0
                 elif device_id != dev0:
@@ -1509,8 +1507,6 @@ def from_dlpack(
             frame.ptr.width = width
             frame.ptr.height = height
             if dev_type0 == kDLCUDA:
-                if primary_ctx is None:
-                    primary_ctx = True
                 if not isinstance(primary_ctx, (bool, int)):
                     raise TypeError("primary_ctx must be a bool")
                 primary_ctx = bool(primary_ctx)

av/video/plane.py

@@ -2,7 +2,6 @@
 
 import cython
 import cython.cimports.libav as lib
-from cython.cimports.av.buffer import Buffer
 from cython.cimports.av.error import err_check
 from cython.cimports.av.video.format import get_pix_fmt, get_video_format
 from cython.cimports.av.video.frame import VideoFrame
@@ -13,7 +12,6 @@
     PyCapsule_IsValid,
     PyCapsule_New,
 )
-from cython.cimports.cpython.ref import PyObject
 from cython.cimports.dlpack import DLManagedTensor, kDLCPU, kDLCUDA, kDLUInt
 from cython.cimports.libc.stdint import int64_t
 from cython.cimports.libc.stdlib import free, malloc
@@ -120,6 +118,11 @@ def __dlpack__(self, stream: int | Any | None = None):
                     "DLPack export is only implemented for CUDA hw frames"
                 )
 
+            if stream is not None:
+                raise NotImplementedError(
+                    "DLPack export with stream is not implemented for CUDA hw frames"
+                )
+
             frames_ctx: cython.pointer[lib.AVHWFramesContext] = cython.cast(
                 cython.pointer[lib.AVHWFramesContext], self.frame.ptr.hw_frames_ctx.data
             )