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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): |
1975af3d SM |
69 | status, res = native_bt.self_component_port_input_message_iterator_can_seek_beginning( |
70 | self._ptr | |
71 | ) | |
f2fb1b32 SM |
72 | utils._handle_func_status( |
73 | status, | |
74 | 'cannot check whether or not message iterator can seek its beginning', | |
75 | ) | |
f00b8d40 SM |
76 | return res != 0 |
77 | ||
78 | def seek_beginning(self): | |
b6909b73 | 79 | # Forget about buffered messages, they won't be valid after seeking. |
f00b8d40 SM |
80 | self._current_msgs.clear() |
81 | self._at = 0 | |
82 | ||
1975af3d SM |
83 | status = native_bt.self_component_port_input_message_iterator_seek_beginning( |
84 | self._ptr | |
85 | ) | |
cfbd7cf3 | 86 | utils._handle_func_status(status, 'cannot seek message iterator beginning') |
f00b8d40 | 87 | |
c182d7dd SM |
88 | def can_seek_ns_from_origin(self, ns_from_origin): |
89 | utils._check_int64(ns_from_origin) | |
90 | status, res = native_bt.self_component_port_input_message_iterator_can_seek_ns_from_origin( | |
91 | self._ptr, ns_from_origin | |
92 | ) | |
93 | utils._handle_func_status( | |
94 | status, | |
95 | 'cannot check whether or not message iterator can seek given ns from origin', | |
96 | ) | |
97 | return res != 0 | |
98 | ||
99 | def seek_ns_from_origin(self, ns_from_origin): | |
100 | utils._check_int64(ns_from_origin) | |
101 | ||
102 | # Forget about buffered messages, they won't be valid after seeking. | |
103 | self._current_msgs.clear() | |
104 | self._at = 0 | |
105 | ||
106 | status = native_bt.self_component_port_input_message_iterator_seek_ns_from_origin( | |
107 | self._ptr, ns_from_origin | |
108 | ) | |
109 | utils._handle_func_status( | |
110 | status, 'message iterator cannot seek given ns from origin' | |
111 | ) | |
112 | ||
8d8b141d SM |
113 | @property |
114 | def can_seek_forward(self): | |
115 | return native_bt.self_component_port_input_message_iterator_can_seek_forward( | |
116 | self._ptr | |
117 | ) | |
118 | ||
119 | ||
120 | class _MessageIteratorConfiguration: | |
121 | def __init__(self, ptr): | |
122 | self._ptr = ptr | |
123 | ||
124 | def can_seek_forward(self, value): | |
125 | utils._check_bool(value) | |
126 | native_bt.self_message_iterator_configuration_set_can_seek_forward( | |
127 | self._ptr, value | |
128 | ) | |
129 | ||
130 | can_seek_forward = property(fset=can_seek_forward) | |
131 | ||
811644b8 | 132 | |
c5f330cd SM |
133 | # This is extended by the user to implement component classes in Python. It |
134 | # is created for a given output port when an input port message iterator is | |
135 | # created on the input port on the other side of the connection. It is also | |
136 | # created when an output port message iterator is created on this output port. | |
137 | # | |
138 | # Its purpose is to feed the messages that should go out through this output | |
139 | # port. | |
5602ef81 | 140 | class _UserMessageIterator(_MessageIterator): |
81447b5b | 141 | def __new__(cls, ptr): |
811644b8 | 142 | # User iterator objects are always created by the native side, |
81447b5b PP |
143 | # that is, never instantiated directly by Python code. |
144 | # | |
811644b8 PP |
145 | # The native code calls this, then manually calls |
146 | # self.__init__() without the `ptr` argument. The user has | |
147 | # access to self.component during this call, thanks to this | |
85906b6b | 148 | # self._bt_ptr argument being set. |
81447b5b | 149 | # |
85906b6b | 150 | # self._bt_ptr is NOT owned by this object here, so there's nothing |
81447b5b PP |
151 | # to do in __del__(). |
152 | self = super().__new__(cls) | |
85906b6b | 153 | self._bt_ptr = ptr |
81447b5b PP |
154 | return self |
155 | ||
8d8b141d | 156 | def _bt_init_from_native(self, config_ptr, self_output_port_ptr): |
3fb99a22 | 157 | self_output_port = bt2_port._create_self_from_ptr_and_get_ref( |
cfbd7cf3 FD |
158 | self_output_port_ptr, native_bt.PORT_TYPE_OUTPUT |
159 | ) | |
8d8b141d SM |
160 | config = _MessageIteratorConfiguration(config_ptr) |
161 | self.__init__(config, self_output_port) | |
c5f330cd | 162 | |
8d8b141d | 163 | def __init__(self, config, self_output_port): |
81447b5b PP |
164 | pass |
165 | ||
166 | @property | |
811644b8 | 167 | def _component(self): |
85906b6b | 168 | return native_bt.bt2_get_user_component_from_user_msg_iter(self._bt_ptr) |
81447b5b | 169 | |
14503fb1 SM |
170 | @property |
171 | def _port(self): | |
172 | port_ptr = native_bt.self_message_iterator_borrow_port(self._bt_ptr) | |
173 | assert port_ptr is not None | |
174 | return bt2_port._create_self_from_ptr_and_get_ref( | |
175 | port_ptr, native_bt.PORT_TYPE_OUTPUT | |
176 | ) | |
177 | ||
81447b5b PP |
178 | @property |
179 | def addr(self): | |
85906b6b | 180 | return int(self._bt_ptr) |
81447b5b | 181 | |
9b4f9b42 PP |
182 | @property |
183 | def _is_interrupted(self): | |
184 | return bool(native_bt.self_message_iterator_is_interrupted(self._bt_ptr)) | |
185 | ||
6a91742b | 186 | def _user_finalize(self): |
81447b5b PP |
187 | pass |
188 | ||
811644b8 PP |
189 | def __next__(self): |
190 | raise bt2.Stop | |
191 | ||
85906b6b | 192 | def _bt_next_from_native(self): |
811644b8 PP |
193 | # this can raise anything: it's catched by the native part |
194 | try: | |
5602ef81 | 195 | msg = next(self) |
811644b8 PP |
196 | except StopIteration: |
197 | raise bt2.Stop | |
4c4935bf | 198 | except Exception: |
811644b8 PP |
199 | raise |
200 | ||
f0a42b33 | 201 | utils._check_type(msg, bt2_message._MessageConst) |
81447b5b | 202 | |
d79a8353 SM |
203 | # The reference we return will be given to the message array. |
204 | # However, the `msg` Python object may stay alive, if the user has kept | |
205 | # a reference to it. Acquire a new reference to account for that. | |
206 | msg._get_ref(msg._ptr) | |
207 | return int(msg._ptr) | |
2ae9f48c | 208 | |
85906b6b | 209 | def _bt_can_seek_beginning_from_native(self): |
f00b8d40 SM |
210 | # Here, we mimic the behavior of the C API: |
211 | # | |
14cfc8ce | 212 | # - If the iterator has a _user_can_seek_beginning method, |
6a91742b | 213 | # read it and use that result. |
5a096c63 | 214 | # - Otherwise, the presence or absence of a `_user_seek_beginning` |
f00b8d40 | 215 | # method indicates whether the iterator can seek beginning. |
6a91742b | 216 | if hasattr(self, '_user_can_seek_beginning'): |
14cfc8ce | 217 | can_seek_beginning = self._user_can_seek_beginning() |
f00b8d40 SM |
218 | utils._check_bool(can_seek_beginning) |
219 | return can_seek_beginning | |
220 | else: | |
6a91742b | 221 | return hasattr(self, '_user_seek_beginning') |
f00b8d40 | 222 | |
85906b6b | 223 | def _bt_seek_beginning_from_native(self): |
6a91742b | 224 | self._user_seek_beginning() |
f00b8d40 | 225 | |
c182d7dd | 226 | def _bt_can_seek_ns_from_origin_from_native(self, ns_from_origin): |
c0e46a7c SM |
227 | # Return whether the iterator can seek ns from origin using the |
228 | # user-implemented seek_ns_from_origin method. We mimic the behavior | |
229 | # of the C API: | |
c182d7dd SM |
230 | # |
231 | # - If the iterator has a _user_can_seek_ns_from_origin method, | |
232 | # call it and use its return value. | |
233 | # - Otherwise, if there is a `_user_seek_ns_from_origin` method, | |
234 | # we presume it's possible. | |
c0e46a7c | 235 | |
c182d7dd SM |
236 | if hasattr(self, '_user_can_seek_ns_from_origin'): |
237 | can_seek_ns_from_origin = self._user_can_seek_ns_from_origin(ns_from_origin) | |
238 | utils._check_bool(can_seek_ns_from_origin) | |
239 | return can_seek_ns_from_origin | |
c182d7dd | 240 | else: |
c0e46a7c | 241 | return hasattr(self, '_user_seek_ns_from_origin') |
c182d7dd SM |
242 | |
243 | def _bt_seek_ns_from_origin_from_native(self, ns_from_origin): | |
244 | self._user_seek_ns_from_origin(ns_from_origin) | |
245 | ||
ca02df0a | 246 | def _create_input_port_message_iterator(self, input_port): |
3fb99a22 | 247 | utils._check_type(input_port, bt2_port._UserComponentInputPort) |
ca02df0a | 248 | |
e803df70 | 249 | status, msg_iter_ptr = native_bt.bt2_self_component_port_input_message_iterator_create_from_message_iterator( |
ca02df0a PP |
250 | self._bt_ptr, input_port._ptr |
251 | ) | |
e803df70 SM |
252 | utils._handle_func_status(status, 'cannot create message iterator object') |
253 | assert msg_iter_ptr is not None | |
ca02df0a PP |
254 | |
255 | return _UserComponentInputPortMessageIterator(msg_iter_ptr) | |
256 | ||
36d9460d | 257 | def _create_event_message(self, event_class, parent, default_clock_snapshot=None): |
3fb99a22 | 258 | utils._check_type(event_class, bt2_event_class._EventClass) |
26fc5aed PP |
259 | |
260 | if event_class.stream_class.supports_packets: | |
3fb99a22 | 261 | utils._check_type(parent, bt2_packet._Packet) |
26fc5aed | 262 | else: |
3fb99a22 | 263 | utils._check_type(parent, bt2_stream._Stream) |
2ae9f48c SM |
264 | |
265 | if default_clock_snapshot is not None: | |
c6af194f | 266 | if event_class.stream_class.default_clock_class is None: |
cfbd7cf3 FD |
267 | raise ValueError( |
268 | 'event messages in this stream must not have a default clock snapshot' | |
269 | ) | |
c6af194f | 270 | |
2ae9f48c | 271 | utils._check_uint64(default_clock_snapshot) |
26fc5aed PP |
272 | |
273 | if event_class.stream_class.supports_packets: | |
274 | ptr = native_bt.message_event_create_with_packet_and_default_clock_snapshot( | |
cfbd7cf3 FD |
275 | self._bt_ptr, event_class._ptr, parent._ptr, default_clock_snapshot |
276 | ) | |
26fc5aed PP |
277 | else: |
278 | ptr = native_bt.message_event_create_with_default_clock_snapshot( | |
cfbd7cf3 FD |
279 | self._bt_ptr, event_class._ptr, parent._ptr, default_clock_snapshot |
280 | ) | |
2ae9f48c | 281 | else: |
c6af194f | 282 | if event_class.stream_class.default_clock_class is not None: |
cfbd7cf3 FD |
283 | raise ValueError( |
284 | 'event messages in this stream must have a default clock snapshot' | |
285 | ) | |
c6af194f | 286 | |
26fc5aed PP |
287 | if event_class.stream_class.supports_packets: |
288 | ptr = native_bt.message_event_create_with_packet( | |
cfbd7cf3 FD |
289 | self._bt_ptr, event_class._ptr, parent._ptr |
290 | ) | |
26fc5aed PP |
291 | else: |
292 | ptr = native_bt.message_event_create( | |
cfbd7cf3 FD |
293 | self._bt_ptr, event_class._ptr, parent._ptr |
294 | ) | |
2ae9f48c SM |
295 | |
296 | if ptr is None: | |
694c792b | 297 | raise bt2._MemoryError('cannot create event message object') |
2ae9f48c | 298 | |
3fb99a22 | 299 | return bt2_message._EventMessage(ptr) |
2ae9f48c | 300 | |
9ec609ec | 301 | def _create_message_iterator_inactivity_message(self, clock_class, clock_snapshot): |
3fb99a22 | 302 | utils._check_type(clock_class, bt2_clock_class._ClockClass) |
9ec609ec | 303 | ptr = native_bt.message_message_iterator_inactivity_create( |
cfbd7cf3 FD |
304 | self._bt_ptr, clock_class._ptr, clock_snapshot |
305 | ) | |
9ec609ec SM |
306 | |
307 | if ptr is None: | |
694c792b | 308 | raise bt2._MemoryError('cannot create inactivity message object') |
9ec609ec | 309 | |
3fb99a22 | 310 | return bt2_message._MessageIteratorInactivityMessage(ptr) |
9ec609ec | 311 | |
188edac1 | 312 | def _create_stream_beginning_message(self, stream, default_clock_snapshot=None): |
3fb99a22 | 313 | utils._check_type(stream, bt2_stream._Stream) |
2ae9f48c | 314 | |
85906b6b | 315 | ptr = native_bt.message_stream_beginning_create(self._bt_ptr, stream._ptr) |
2ae9f48c | 316 | if ptr is None: |
694c792b | 317 | raise bt2._MemoryError('cannot create stream beginning message object') |
2ae9f48c | 318 | |
3fb99a22 | 319 | msg = bt2_message._StreamBeginningMessage(ptr) |
9ec609ec | 320 | |
188edac1 SM |
321 | if default_clock_snapshot is not None: |
322 | msg._default_clock_snapshot = default_clock_snapshot | |
9ec609ec | 323 | |
9ec609ec SM |
324 | return msg |
325 | ||
188edac1 | 326 | def _create_stream_end_message(self, stream, default_clock_snapshot=None): |
3fb99a22 | 327 | utils._check_type(stream, bt2_stream._Stream) |
5f25509b | 328 | |
85906b6b | 329 | ptr = native_bt.message_stream_end_create(self._bt_ptr, stream._ptr) |
5f25509b | 330 | if ptr is None: |
694c792b | 331 | raise bt2._MemoryError('cannot create stream end message object') |
5f25509b | 332 | |
3fb99a22 | 333 | msg = bt2_message._StreamEndMessage(ptr) |
188edac1 SM |
334 | |
335 | if default_clock_snapshot is not None: | |
336 | msg._default_clock_snapshot = default_clock_snapshot | |
337 | ||
338 | return msg | |
5f25509b | 339 | |
2ae9f48c | 340 | def _create_packet_beginning_message(self, packet, default_clock_snapshot=None): |
3fb99a22 | 341 | utils._check_type(packet, bt2_packet._Packet) |
2ae9f48c | 342 | |
e8ac1aae | 343 | if packet.stream.cls.packets_have_beginning_default_clock_snapshot: |
2ae9f48c | 344 | if default_clock_snapshot is None: |
cfbd7cf3 FD |
345 | raise ValueError( |
346 | "packet beginning messages in this stream must have a default clock snapshot" | |
347 | ) | |
2ae9f48c SM |
348 | |
349 | utils._check_uint64(default_clock_snapshot) | |
350 | ptr = native_bt.message_packet_beginning_create_with_default_clock_snapshot( | |
cfbd7cf3 FD |
351 | self._bt_ptr, packet._ptr, default_clock_snapshot |
352 | ) | |
2ae9f48c SM |
353 | else: |
354 | if default_clock_snapshot is not None: | |
cfbd7cf3 FD |
355 | raise ValueError( |
356 | "packet beginning messages in this stream must not have a default clock snapshot" | |
357 | ) | |
2ae9f48c | 358 | |
85906b6b | 359 | ptr = native_bt.message_packet_beginning_create(self._bt_ptr, packet._ptr) |
2ae9f48c SM |
360 | |
361 | if ptr is None: | |
694c792b | 362 | raise bt2._MemoryError('cannot create packet beginning message object') |
2ae9f48c | 363 | |
3fb99a22 | 364 | return bt2_message._PacketBeginningMessage(ptr) |
5f25509b SM |
365 | |
366 | def _create_packet_end_message(self, packet, default_clock_snapshot=None): | |
3fb99a22 | 367 | utils._check_type(packet, bt2_packet._Packet) |
5f25509b | 368 | |
e8ac1aae | 369 | if packet.stream.cls.packets_have_end_default_clock_snapshot: |
9ec609ec | 370 | if default_clock_snapshot is None: |
cfbd7cf3 FD |
371 | raise ValueError( |
372 | "packet end messages in this stream must have a default clock snapshot" | |
373 | ) | |
9ec609ec | 374 | |
5f25509b SM |
375 | utils._check_uint64(default_clock_snapshot) |
376 | ptr = native_bt.message_packet_end_create_with_default_clock_snapshot( | |
cfbd7cf3 FD |
377 | self._bt_ptr, packet._ptr, default_clock_snapshot |
378 | ) | |
5f25509b | 379 | else: |
9ec609ec | 380 | if default_clock_snapshot is not None: |
cfbd7cf3 FD |
381 | raise ValueError( |
382 | "packet end messages in this stream must not have a default clock snapshot" | |
383 | ) | |
9ec609ec | 384 | |
85906b6b | 385 | ptr = native_bt.message_packet_end_create(self._bt_ptr, packet._ptr) |
5f25509b SM |
386 | |
387 | if ptr is None: | |
694c792b | 388 | raise bt2._MemoryError('cannot create packet end message object') |
5f25509b | 389 | |
3fb99a22 | 390 | return bt2_message._PacketEndMessage(ptr) |
9ec609ec | 391 | |
cfbd7cf3 FD |
392 | def _create_discarded_events_message( |
393 | self, stream, count=None, beg_clock_snapshot=None, end_clock_snapshot=None | |
394 | ): | |
3fb99a22 | 395 | utils._check_type(stream, bt2_stream._Stream) |
9ec609ec | 396 | |
e8ac1aae | 397 | if not stream.cls.supports_discarded_events: |
2e90378a PP |
398 | raise ValueError('stream class does not support discarded events') |
399 | ||
e8ac1aae | 400 | if stream.cls.discarded_events_have_default_clock_snapshots: |
2e90378a | 401 | if beg_clock_snapshot is None or end_clock_snapshot is None: |
cfbd7cf3 FD |
402 | raise ValueError( |
403 | 'discarded events have default clock snapshots for this stream class' | |
404 | ) | |
2e90378a | 405 | |
9ec609ec SM |
406 | utils._check_uint64(beg_clock_snapshot) |
407 | utils._check_uint64(end_clock_snapshot) | |
408 | ptr = native_bt.message_discarded_events_create_with_default_clock_snapshots( | |
cfbd7cf3 FD |
409 | self._bt_ptr, stream._ptr, beg_clock_snapshot, end_clock_snapshot |
410 | ) | |
9ec609ec | 411 | else: |
2e90378a | 412 | if beg_clock_snapshot is not None or end_clock_snapshot is not None: |
cfbd7cf3 FD |
413 | raise ValueError( |
414 | 'discarded events have no default clock snapshots for this stream class' | |
415 | ) | |
2e90378a | 416 | |
cfbd7cf3 | 417 | ptr = native_bt.message_discarded_events_create(self._bt_ptr, stream._ptr) |
9ec609ec SM |
418 | |
419 | if ptr is None: | |
694c792b | 420 | raise bt2._MemoryError('cannot discarded events message object') |
9ec609ec | 421 | |
3fb99a22 | 422 | msg = bt2_message._DiscardedEventsMessage(ptr) |
9ec609ec SM |
423 | |
424 | if count is not None: | |
425 | msg._count = count | |
426 | ||
427 | return msg | |
428 | ||
cfbd7cf3 FD |
429 | def _create_discarded_packets_message( |
430 | self, stream, count=None, beg_clock_snapshot=None, end_clock_snapshot=None | |
431 | ): | |
3fb99a22 | 432 | utils._check_type(stream, bt2_stream._Stream) |
9ec609ec | 433 | |
e8ac1aae | 434 | if not stream.cls.supports_discarded_packets: |
2e90378a PP |
435 | raise ValueError('stream class does not support discarded packets') |
436 | ||
e8ac1aae | 437 | if stream.cls.discarded_packets_have_default_clock_snapshots: |
2e90378a | 438 | if beg_clock_snapshot is None or end_clock_snapshot is None: |
cfbd7cf3 FD |
439 | raise ValueError( |
440 | 'discarded packets have default clock snapshots for this stream class' | |
441 | ) | |
2e90378a | 442 | |
9ec609ec SM |
443 | utils._check_uint64(beg_clock_snapshot) |
444 | utils._check_uint64(end_clock_snapshot) | |
445 | ptr = native_bt.message_discarded_packets_create_with_default_clock_snapshots( | |
cfbd7cf3 FD |
446 | self._bt_ptr, stream._ptr, beg_clock_snapshot, end_clock_snapshot |
447 | ) | |
9ec609ec | 448 | else: |
2e90378a | 449 | if beg_clock_snapshot is not None or end_clock_snapshot is not None: |
cfbd7cf3 FD |
450 | raise ValueError( |
451 | 'discarded packets have no default clock snapshots for this stream class' | |
452 | ) | |
2e90378a | 453 | |
cfbd7cf3 | 454 | ptr = native_bt.message_discarded_packets_create(self._bt_ptr, stream._ptr) |
9ec609ec SM |
455 | |
456 | if ptr is None: | |
694c792b | 457 | raise bt2._MemoryError('cannot discarded packets message object') |
9ec609ec | 458 | |
3fb99a22 | 459 | msg = bt2_message._DiscardedPacketsMessage(ptr) |
9ec609ec SM |
460 | |
461 | if count is not None: | |
462 | msg._count = count | |
463 | ||
464 | return msg |