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81447b5b PP |
1 | # The MIT License (MIT) |
2 | # | |
3 | # Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com> | |
4 | # | |
5 | # Permission is hereby granted, free of charge, to any person obtaining a copy | |
6 | # of this software and associated documentation files (the "Software"), to deal | |
7 | # in the Software without restriction, including without limitation the rights | |
8 | # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
9 | # copies of the Software, and to permit persons to whom the Software is | |
10 | # furnished to do so, subject to the following conditions: | |
11 | # | |
12 | # The above copyright notice and this permission notice shall be included in | |
13 | # all copies or substantial portions of the Software. | |
14 | # | |
15 | # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
18 | # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
20 | # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
21 | # THE SOFTWARE. | |
22 | ||
23 | from bt2 import native_bt, object, utils | |
3fb99a22 | 24 | from bt2 import message as bt2_message |
81447b5b | 25 | import collections.abc |
3fb99a22 PP |
26 | from bt2 import stream as bt2_stream |
27 | from bt2 import event_class as bt2_event_class | |
28 | from bt2 import packet as bt2_packet | |
29 | from bt2 import port as bt2_port | |
30 | from bt2 import clock_class as bt2_clock_class | |
81447b5b PP |
31 | import bt2 |
32 | ||
33 | ||
5602ef81 | 34 | class _MessageIterator(collections.abc.Iterator): |
81447b5b | 35 | def __next__(self): |
811644b8 | 36 | raise NotImplementedError |
81447b5b PP |
37 | |
38 | ||
1975af3d SM |
39 | class _UserComponentInputPortMessageIterator(object._SharedObject, _MessageIterator): |
40 | _get_ref = staticmethod( | |
41 | native_bt.self_component_port_input_message_iterator_get_ref | |
42 | ) | |
43 | _put_ref = staticmethod( | |
44 | native_bt.self_component_port_input_message_iterator_put_ref | |
45 | ) | |
46 | ||
2ae9f48c | 47 | def __init__(self, ptr): |
cfbd7cf3 FD |
48 | self._current_msgs = [] |
49 | self._at = 0 | |
50 | super().__init__(ptr) | |
811644b8 PP |
51 | |
52 | def __next__(self): | |
2ae9f48c | 53 | if len(self._current_msgs) == self._at: |
1975af3d SM |
54 | status, msgs = native_bt.bt2_self_component_port_input_get_msg_range( |
55 | self._ptr | |
56 | ) | |
cfbd7cf3 FD |
57 | utils._handle_func_status( |
58 | status, 'unexpected error: cannot advance the message iterator' | |
59 | ) | |
2ae9f48c SM |
60 | self._current_msgs = msgs |
61 | self._at = 0 | |
62 | ||
63 | msg_ptr = self._current_msgs[self._at] | |
64 | self._at += 1 | |
65 | ||
3fb99a22 | 66 | return bt2_message._create_from_ptr(msg_ptr) |
81447b5b | 67 | |
f00b8d40 | 68 | def can_seek_beginning(self): |
75882e97 FD |
69 | ( |
70 | status, | |
71 | res, | |
72 | ) = native_bt.self_component_port_input_message_iterator_can_seek_beginning( | |
1975af3d SM |
73 | self._ptr |
74 | ) | |
f2fb1b32 SM |
75 | utils._handle_func_status( |
76 | status, | |
77 | 'cannot check whether or not message iterator can seek its beginning', | |
78 | ) | |
f00b8d40 SM |
79 | return res != 0 |
80 | ||
81 | def seek_beginning(self): | |
b6909b73 | 82 | # Forget about buffered messages, they won't be valid after seeking. |
f00b8d40 SM |
83 | self._current_msgs.clear() |
84 | self._at = 0 | |
85 | ||
1975af3d SM |
86 | status = native_bt.self_component_port_input_message_iterator_seek_beginning( |
87 | self._ptr | |
88 | ) | |
cfbd7cf3 | 89 | utils._handle_func_status(status, 'cannot seek message iterator beginning') |
f00b8d40 | 90 | |
c182d7dd SM |
91 | def can_seek_ns_from_origin(self, ns_from_origin): |
92 | utils._check_int64(ns_from_origin) | |
75882e97 FD |
93 | ( |
94 | status, | |
95 | res, | |
96 | ) = native_bt.self_component_port_input_message_iterator_can_seek_ns_from_origin( | |
c182d7dd SM |
97 | self._ptr, ns_from_origin |
98 | ) | |
99 | utils._handle_func_status( | |
100 | status, | |
101 | 'cannot check whether or not message iterator can seek given ns from origin', | |
102 | ) | |
103 | return res != 0 | |
104 | ||
105 | def seek_ns_from_origin(self, ns_from_origin): | |
106 | utils._check_int64(ns_from_origin) | |
107 | ||
108 | # Forget about buffered messages, they won't be valid after seeking. | |
109 | self._current_msgs.clear() | |
110 | self._at = 0 | |
111 | ||
112 | status = native_bt.self_component_port_input_message_iterator_seek_ns_from_origin( | |
113 | self._ptr, ns_from_origin | |
114 | ) | |
115 | utils._handle_func_status( | |
116 | status, 'message iterator cannot seek given ns from origin' | |
117 | ) | |
118 | ||
8d8b141d SM |
119 | @property |
120 | def can_seek_forward(self): | |
121 | return native_bt.self_component_port_input_message_iterator_can_seek_forward( | |
122 | self._ptr | |
123 | ) | |
124 | ||
125 | ||
126 | class _MessageIteratorConfiguration: | |
127 | def __init__(self, ptr): | |
128 | self._ptr = ptr | |
129 | ||
130 | def can_seek_forward(self, value): | |
131 | utils._check_bool(value) | |
132 | native_bt.self_message_iterator_configuration_set_can_seek_forward( | |
133 | self._ptr, value | |
134 | ) | |
135 | ||
136 | can_seek_forward = property(fset=can_seek_forward) | |
137 | ||
811644b8 | 138 | |
c5f330cd SM |
139 | # This is extended by the user to implement component classes in Python. It |
140 | # is created for a given output port when an input port message iterator is | |
141 | # created on the input port on the other side of the connection. It is also | |
142 | # created when an output port message iterator is created on this output port. | |
143 | # | |
144 | # Its purpose is to feed the messages that should go out through this output | |
145 | # port. | |
5602ef81 | 146 | class _UserMessageIterator(_MessageIterator): |
81447b5b | 147 | def __new__(cls, ptr): |
811644b8 | 148 | # User iterator objects are always created by the native side, |
81447b5b PP |
149 | # that is, never instantiated directly by Python code. |
150 | # | |
811644b8 PP |
151 | # The native code calls this, then manually calls |
152 | # self.__init__() without the `ptr` argument. The user has | |
153 | # access to self.component during this call, thanks to this | |
85906b6b | 154 | # self._bt_ptr argument being set. |
81447b5b | 155 | # |
85906b6b | 156 | # self._bt_ptr is NOT owned by this object here, so there's nothing |
81447b5b PP |
157 | # to do in __del__(). |
158 | self = super().__new__(cls) | |
85906b6b | 159 | self._bt_ptr = ptr |
81447b5b PP |
160 | return self |
161 | ||
8d8b141d | 162 | def _bt_init_from_native(self, config_ptr, self_output_port_ptr): |
3fb99a22 | 163 | self_output_port = bt2_port._create_self_from_ptr_and_get_ref( |
cfbd7cf3 FD |
164 | self_output_port_ptr, native_bt.PORT_TYPE_OUTPUT |
165 | ) | |
8d8b141d SM |
166 | config = _MessageIteratorConfiguration(config_ptr) |
167 | self.__init__(config, self_output_port) | |
c5f330cd | 168 | |
8d8b141d | 169 | def __init__(self, config, self_output_port): |
81447b5b PP |
170 | pass |
171 | ||
172 | @property | |
811644b8 | 173 | def _component(self): |
85906b6b | 174 | return native_bt.bt2_get_user_component_from_user_msg_iter(self._bt_ptr) |
81447b5b | 175 | |
14503fb1 SM |
176 | @property |
177 | def _port(self): | |
178 | port_ptr = native_bt.self_message_iterator_borrow_port(self._bt_ptr) | |
179 | assert port_ptr is not None | |
180 | return bt2_port._create_self_from_ptr_and_get_ref( | |
181 | port_ptr, native_bt.PORT_TYPE_OUTPUT | |
182 | ) | |
183 | ||
81447b5b PP |
184 | @property |
185 | def addr(self): | |
85906b6b | 186 | return int(self._bt_ptr) |
81447b5b | 187 | |
9b4f9b42 PP |
188 | @property |
189 | def _is_interrupted(self): | |
190 | return bool(native_bt.self_message_iterator_is_interrupted(self._bt_ptr)) | |
191 | ||
6a91742b | 192 | def _user_finalize(self): |
81447b5b PP |
193 | pass |
194 | ||
811644b8 PP |
195 | def __next__(self): |
196 | raise bt2.Stop | |
197 | ||
85906b6b | 198 | def _bt_next_from_native(self): |
811644b8 PP |
199 | # this can raise anything: it's catched by the native part |
200 | try: | |
5602ef81 | 201 | msg = next(self) |
811644b8 PP |
202 | except StopIteration: |
203 | raise bt2.Stop | |
4c4935bf | 204 | except Exception: |
811644b8 PP |
205 | raise |
206 | ||
f0a42b33 | 207 | utils._check_type(msg, bt2_message._MessageConst) |
81447b5b | 208 | |
d79a8353 SM |
209 | # The reference we return will be given to the message array. |
210 | # However, the `msg` Python object may stay alive, if the user has kept | |
211 | # a reference to it. Acquire a new reference to account for that. | |
212 | msg._get_ref(msg._ptr) | |
213 | return int(msg._ptr) | |
2ae9f48c | 214 | |
85906b6b | 215 | def _bt_can_seek_beginning_from_native(self): |
f00b8d40 SM |
216 | # Here, we mimic the behavior of the C API: |
217 | # | |
14cfc8ce | 218 | # - If the iterator has a _user_can_seek_beginning method, |
6a91742b | 219 | # read it and use that result. |
5a096c63 | 220 | # - Otherwise, the presence or absence of a `_user_seek_beginning` |
f00b8d40 | 221 | # method indicates whether the iterator can seek beginning. |
6a91742b | 222 | if hasattr(self, '_user_can_seek_beginning'): |
14cfc8ce | 223 | can_seek_beginning = self._user_can_seek_beginning() |
f00b8d40 SM |
224 | utils._check_bool(can_seek_beginning) |
225 | return can_seek_beginning | |
226 | else: | |
6a91742b | 227 | return hasattr(self, '_user_seek_beginning') |
f00b8d40 | 228 | |
85906b6b | 229 | def _bt_seek_beginning_from_native(self): |
6a91742b | 230 | self._user_seek_beginning() |
f00b8d40 | 231 | |
c182d7dd | 232 | def _bt_can_seek_ns_from_origin_from_native(self, ns_from_origin): |
c0e46a7c SM |
233 | # Return whether the iterator can seek ns from origin using the |
234 | # user-implemented seek_ns_from_origin method. We mimic the behavior | |
235 | # of the C API: | |
c182d7dd SM |
236 | # |
237 | # - If the iterator has a _user_can_seek_ns_from_origin method, | |
238 | # call it and use its return value. | |
239 | # - Otherwise, if there is a `_user_seek_ns_from_origin` method, | |
240 | # we presume it's possible. | |
c0e46a7c | 241 | |
c182d7dd SM |
242 | if hasattr(self, '_user_can_seek_ns_from_origin'): |
243 | can_seek_ns_from_origin = self._user_can_seek_ns_from_origin(ns_from_origin) | |
244 | utils._check_bool(can_seek_ns_from_origin) | |
245 | return can_seek_ns_from_origin | |
c182d7dd | 246 | else: |
c0e46a7c | 247 | return hasattr(self, '_user_seek_ns_from_origin') |
c182d7dd SM |
248 | |
249 | def _bt_seek_ns_from_origin_from_native(self, ns_from_origin): | |
250 | self._user_seek_ns_from_origin(ns_from_origin) | |
251 | ||
ca02df0a | 252 | def _create_input_port_message_iterator(self, input_port): |
3fb99a22 | 253 | utils._check_type(input_port, bt2_port._UserComponentInputPort) |
ca02df0a | 254 | |
75882e97 FD |
255 | ( |
256 | status, | |
257 | msg_iter_ptr, | |
258 | ) = native_bt.bt2_self_component_port_input_message_iterator_create_from_message_iterator( | |
ca02df0a PP |
259 | self._bt_ptr, input_port._ptr |
260 | ) | |
e803df70 SM |
261 | utils._handle_func_status(status, 'cannot create message iterator object') |
262 | assert msg_iter_ptr is not None | |
ca02df0a PP |
263 | |
264 | return _UserComponentInputPortMessageIterator(msg_iter_ptr) | |
265 | ||
36d9460d | 266 | def _create_event_message(self, event_class, parent, default_clock_snapshot=None): |
3fb99a22 | 267 | utils._check_type(event_class, bt2_event_class._EventClass) |
26fc5aed PP |
268 | |
269 | if event_class.stream_class.supports_packets: | |
3fb99a22 | 270 | utils._check_type(parent, bt2_packet._Packet) |
26fc5aed | 271 | else: |
3fb99a22 | 272 | utils._check_type(parent, bt2_stream._Stream) |
2ae9f48c SM |
273 | |
274 | if default_clock_snapshot is not None: | |
c6af194f | 275 | if event_class.stream_class.default_clock_class is None: |
cfbd7cf3 FD |
276 | raise ValueError( |
277 | 'event messages in this stream must not have a default clock snapshot' | |
278 | ) | |
c6af194f | 279 | |
2ae9f48c | 280 | utils._check_uint64(default_clock_snapshot) |
26fc5aed PP |
281 | |
282 | if event_class.stream_class.supports_packets: | |
283 | ptr = native_bt.message_event_create_with_packet_and_default_clock_snapshot( | |
cfbd7cf3 FD |
284 | self._bt_ptr, event_class._ptr, parent._ptr, default_clock_snapshot |
285 | ) | |
26fc5aed PP |
286 | else: |
287 | ptr = native_bt.message_event_create_with_default_clock_snapshot( | |
cfbd7cf3 FD |
288 | self._bt_ptr, event_class._ptr, parent._ptr, default_clock_snapshot |
289 | ) | |
2ae9f48c | 290 | else: |
c6af194f | 291 | if event_class.stream_class.default_clock_class is not None: |
cfbd7cf3 FD |
292 | raise ValueError( |
293 | 'event messages in this stream must have a default clock snapshot' | |
294 | ) | |
c6af194f | 295 | |
26fc5aed PP |
296 | if event_class.stream_class.supports_packets: |
297 | ptr = native_bt.message_event_create_with_packet( | |
cfbd7cf3 FD |
298 | self._bt_ptr, event_class._ptr, parent._ptr |
299 | ) | |
26fc5aed PP |
300 | else: |
301 | ptr = native_bt.message_event_create( | |
cfbd7cf3 FD |
302 | self._bt_ptr, event_class._ptr, parent._ptr |
303 | ) | |
2ae9f48c SM |
304 | |
305 | if ptr is None: | |
694c792b | 306 | raise bt2._MemoryError('cannot create event message object') |
2ae9f48c | 307 | |
3fb99a22 | 308 | return bt2_message._EventMessage(ptr) |
2ae9f48c | 309 | |
9ec609ec | 310 | def _create_message_iterator_inactivity_message(self, clock_class, clock_snapshot): |
3fb99a22 | 311 | utils._check_type(clock_class, bt2_clock_class._ClockClass) |
9ec609ec | 312 | ptr = native_bt.message_message_iterator_inactivity_create( |
cfbd7cf3 FD |
313 | self._bt_ptr, clock_class._ptr, clock_snapshot |
314 | ) | |
9ec609ec SM |
315 | |
316 | if ptr is None: | |
694c792b | 317 | raise bt2._MemoryError('cannot create inactivity message object') |
9ec609ec | 318 | |
3fb99a22 | 319 | return bt2_message._MessageIteratorInactivityMessage(ptr) |
9ec609ec | 320 | |
188edac1 | 321 | def _create_stream_beginning_message(self, stream, default_clock_snapshot=None): |
3fb99a22 | 322 | utils._check_type(stream, bt2_stream._Stream) |
2ae9f48c | 323 | |
85906b6b | 324 | ptr = native_bt.message_stream_beginning_create(self._bt_ptr, stream._ptr) |
2ae9f48c | 325 | if ptr is None: |
694c792b | 326 | raise bt2._MemoryError('cannot create stream beginning message object') |
2ae9f48c | 327 | |
3fb99a22 | 328 | msg = bt2_message._StreamBeginningMessage(ptr) |
9ec609ec | 329 | |
188edac1 SM |
330 | if default_clock_snapshot is not None: |
331 | msg._default_clock_snapshot = default_clock_snapshot | |
9ec609ec | 332 | |
9ec609ec SM |
333 | return msg |
334 | ||
188edac1 | 335 | def _create_stream_end_message(self, stream, default_clock_snapshot=None): |
3fb99a22 | 336 | utils._check_type(stream, bt2_stream._Stream) |
5f25509b | 337 | |
85906b6b | 338 | ptr = native_bt.message_stream_end_create(self._bt_ptr, stream._ptr) |
5f25509b | 339 | if ptr is None: |
694c792b | 340 | raise bt2._MemoryError('cannot create stream end message object') |
5f25509b | 341 | |
3fb99a22 | 342 | msg = bt2_message._StreamEndMessage(ptr) |
188edac1 SM |
343 | |
344 | if default_clock_snapshot is not None: | |
345 | msg._default_clock_snapshot = default_clock_snapshot | |
346 | ||
347 | return msg | |
5f25509b | 348 | |
2ae9f48c | 349 | def _create_packet_beginning_message(self, packet, default_clock_snapshot=None): |
3fb99a22 | 350 | utils._check_type(packet, bt2_packet._Packet) |
2ae9f48c | 351 | |
e8ac1aae | 352 | if packet.stream.cls.packets_have_beginning_default_clock_snapshot: |
2ae9f48c | 353 | if default_clock_snapshot is None: |
cfbd7cf3 FD |
354 | raise ValueError( |
355 | "packet beginning messages in this stream must have a default clock snapshot" | |
356 | ) | |
2ae9f48c SM |
357 | |
358 | utils._check_uint64(default_clock_snapshot) | |
359 | ptr = native_bt.message_packet_beginning_create_with_default_clock_snapshot( | |
cfbd7cf3 FD |
360 | self._bt_ptr, packet._ptr, default_clock_snapshot |
361 | ) | |
2ae9f48c SM |
362 | else: |
363 | if default_clock_snapshot is not None: | |
cfbd7cf3 FD |
364 | raise ValueError( |
365 | "packet beginning messages in this stream must not have a default clock snapshot" | |
366 | ) | |
2ae9f48c | 367 | |
85906b6b | 368 | ptr = native_bt.message_packet_beginning_create(self._bt_ptr, packet._ptr) |
2ae9f48c SM |
369 | |
370 | if ptr is None: | |
694c792b | 371 | raise bt2._MemoryError('cannot create packet beginning message object') |
2ae9f48c | 372 | |
3fb99a22 | 373 | return bt2_message._PacketBeginningMessage(ptr) |
5f25509b SM |
374 | |
375 | def _create_packet_end_message(self, packet, default_clock_snapshot=None): | |
3fb99a22 | 376 | utils._check_type(packet, bt2_packet._Packet) |
5f25509b | 377 | |
e8ac1aae | 378 | if packet.stream.cls.packets_have_end_default_clock_snapshot: |
9ec609ec | 379 | if default_clock_snapshot is None: |
cfbd7cf3 FD |
380 | raise ValueError( |
381 | "packet end messages in this stream must have a default clock snapshot" | |
382 | ) | |
9ec609ec | 383 | |
5f25509b SM |
384 | utils._check_uint64(default_clock_snapshot) |
385 | ptr = native_bt.message_packet_end_create_with_default_clock_snapshot( | |
cfbd7cf3 FD |
386 | self._bt_ptr, packet._ptr, default_clock_snapshot |
387 | ) | |
5f25509b | 388 | else: |
9ec609ec | 389 | if default_clock_snapshot is not None: |
cfbd7cf3 FD |
390 | raise ValueError( |
391 | "packet end messages in this stream must not have a default clock snapshot" | |
392 | ) | |
9ec609ec | 393 | |
85906b6b | 394 | ptr = native_bt.message_packet_end_create(self._bt_ptr, packet._ptr) |
5f25509b SM |
395 | |
396 | if ptr is None: | |
694c792b | 397 | raise bt2._MemoryError('cannot create packet end message object') |
5f25509b | 398 | |
3fb99a22 | 399 | return bt2_message._PacketEndMessage(ptr) |
9ec609ec | 400 | |
cfbd7cf3 FD |
401 | def _create_discarded_events_message( |
402 | self, stream, count=None, beg_clock_snapshot=None, end_clock_snapshot=None | |
403 | ): | |
3fb99a22 | 404 | utils._check_type(stream, bt2_stream._Stream) |
9ec609ec | 405 | |
e8ac1aae | 406 | if not stream.cls.supports_discarded_events: |
2e90378a PP |
407 | raise ValueError('stream class does not support discarded events') |
408 | ||
e8ac1aae | 409 | if stream.cls.discarded_events_have_default_clock_snapshots: |
2e90378a | 410 | if beg_clock_snapshot is None or end_clock_snapshot is None: |
cfbd7cf3 FD |
411 | raise ValueError( |
412 | 'discarded events have default clock snapshots for this stream class' | |
413 | ) | |
2e90378a | 414 | |
9ec609ec SM |
415 | utils._check_uint64(beg_clock_snapshot) |
416 | utils._check_uint64(end_clock_snapshot) | |
417 | ptr = native_bt.message_discarded_events_create_with_default_clock_snapshots( | |
cfbd7cf3 FD |
418 | self._bt_ptr, stream._ptr, beg_clock_snapshot, end_clock_snapshot |
419 | ) | |
9ec609ec | 420 | else: |
2e90378a | 421 | if beg_clock_snapshot is not None or end_clock_snapshot is not None: |
cfbd7cf3 FD |
422 | raise ValueError( |
423 | 'discarded events have no default clock snapshots for this stream class' | |
424 | ) | |
2e90378a | 425 | |
cfbd7cf3 | 426 | ptr = native_bt.message_discarded_events_create(self._bt_ptr, stream._ptr) |
9ec609ec SM |
427 | |
428 | if ptr is None: | |
694c792b | 429 | raise bt2._MemoryError('cannot discarded events message object') |
9ec609ec | 430 | |
3fb99a22 | 431 | msg = bt2_message._DiscardedEventsMessage(ptr) |
9ec609ec SM |
432 | |
433 | if count is not None: | |
434 | msg._count = count | |
435 | ||
436 | return msg | |
437 | ||
cfbd7cf3 FD |
438 | def _create_discarded_packets_message( |
439 | self, stream, count=None, beg_clock_snapshot=None, end_clock_snapshot=None | |
440 | ): | |
3fb99a22 | 441 | utils._check_type(stream, bt2_stream._Stream) |
9ec609ec | 442 | |
e8ac1aae | 443 | if not stream.cls.supports_discarded_packets: |
2e90378a PP |
444 | raise ValueError('stream class does not support discarded packets') |
445 | ||
e8ac1aae | 446 | if stream.cls.discarded_packets_have_default_clock_snapshots: |
2e90378a | 447 | if beg_clock_snapshot is None or end_clock_snapshot is None: |
cfbd7cf3 FD |
448 | raise ValueError( |
449 | 'discarded packets have default clock snapshots for this stream class' | |
450 | ) | |
2e90378a | 451 | |
9ec609ec SM |
452 | utils._check_uint64(beg_clock_snapshot) |
453 | utils._check_uint64(end_clock_snapshot) | |
454 | ptr = native_bt.message_discarded_packets_create_with_default_clock_snapshots( | |
cfbd7cf3 FD |
455 | self._bt_ptr, stream._ptr, beg_clock_snapshot, end_clock_snapshot |
456 | ) | |
9ec609ec | 457 | else: |
2e90378a | 458 | if beg_clock_snapshot is not None or end_clock_snapshot is not None: |
cfbd7cf3 FD |
459 | raise ValueError( |
460 | 'discarded packets have no default clock snapshots for this stream class' | |
461 | ) | |
2e90378a | 462 | |
cfbd7cf3 | 463 | ptr = native_bt.message_discarded_packets_create(self._bt_ptr, stream._ptr) |
9ec609ec SM |
464 | |
465 | if ptr is None: | |
694c792b | 466 | raise bt2._MemoryError('cannot discarded packets message object') |
9ec609ec | 467 | |
3fb99a22 | 468 | msg = bt2_message._DiscardedPacketsMessage(ptr) |
9ec609ec SM |
469 | |
470 | if count is not None: | |
471 | msg._count = count | |
472 | ||
473 | return msg |