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recorderFrame.cxx
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file recorderFrame.cxx
10 * @author drose
11 * @date 2004-01-28
12 */
13
14#include "recorderFrame.h"
15#include "recorderTable.h"
16#include "bamReader.h"
17#include "bamWriter.h"
18#include "config_recorder.h"
19
20 TypeHandle RecorderFrame::_type_handle;
21
22/**
23 * Once the raw data has been read in from the session file, and the table has
24 * been decoded, decode the raw data and call play_frame on each recorder.
25 */
26 void RecorderFrame::
27 play_frame(BamReader *manager) {
28 DatagramIterator scan(_data, _data_pos);
29 _table->play_frame(scan, manager);
30
31 // We expect to use up all of the data in the datagram.
32 nassertv(scan.get_remaining_size() == 0);
33}
34
35/**
36 * Tells the BamReader how to create objects of type Lens.
37 */
38 void RecorderFrame::
39 register_with_read_factory() {
40 BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
41}
42
43/**
44 * Writes the contents of this object to the datagram for shipping out to a
45 * Bam file.
46 */
47 void RecorderFrame::
48 write_datagram(BamWriter *manager, Datagram &dg) {
49 TypedWritable::write_datagram(manager, dg);
50 dg.add_float64(_timestamp);
51 dg.add_uint32(_frame);
52
53 // Write the table out if it has changed.
54 dg.add_bool(_table_changed);
55 if (_table_changed) {
56 // As a kludge, we create a new table pointer to write out. Otherwise,
57 // the pointer won't change and it may not write out the changes. Later,
58 // we need to add a facility to the bam writer to detect when a
59 // TypedWritable has changed and should be rewritten.
60 _local_table = *_table;
61 manager->write_pointer(dg, &_local_table);
62 }
63
64 _table->record_frame(manager, dg);
65}
66
67/**
68 * Receives an array of pointers, one for each time manager->read_pointer()
69 * was called in fillin(). Returns the number of pointers processed.
70 *
71 * This is the callback function that is made by the BamReader at some later
72 * point, after all of the required pointers have been filled in. It is
73 * necessary because there might be forward references in a bam file; when we
74 * call read_pointer() in fillin(), the object may not have been read from the
75 * file yet, so we do not have a pointer available at that time. Thus,
76 * instead of returning a pointer, read_pointer() simply reserves a later
77 * callback. This function provides that callback. The calling object is
78 * responsible for keeping track of the number of times it called
79 * read_pointer() and extracting the same number of pointers out of the
80 * supplied vector, and storing them appropriately within the object.
81 */
82 int RecorderFrame::
83 complete_pointers(TypedWritable **p_list, BamReader *manager) {
84 int pi = TypedWritable::complete_pointers(p_list, manager);
85
86 if (_table_changed) {
87 _table = DCAST(RecorderTable, p_list[pi++]);
88 }
89
90 return pi;
91}
92
93/**
94 * This function is called by the BamReader's factory when a new object of
95 * type Lens is encountered in the Bam file. It should create the Lens and
96 * extract its information from the file.
97 */
98 TypedWritable *RecorderFrame::
99make_from_bam(const FactoryParams &params) {
100 RecorderFrame *frame = new RecorderFrame;
101 DatagramIterator scan;
102 BamReader *manager;
103
104 parse_params(params, scan, manager);
105 frame->fillin(scan, manager);
106
107 return frame;
108}
109
110/**
111 * This internal function is called by make_from_bam to read in all of the
112 * relevant data from the BamFile for the new RecorderFrame.
113 */
114 void RecorderFrame::
115fillin(DatagramIterator &scan, BamReader *manager) {
116 TypedWritable::fillin(scan, manager);
117
118 _timestamp = scan.get_float64();
119 _frame = scan.get_uint32();
120 _table_changed = scan.get_bool();
121 _table = nullptr;
122 if (_table_changed) {
123 manager->read_pointer(scan);
124 }
125
126 // We can't decode the data in the frame until we have (a) gotten back the
127 // table pointer, or (b) been told who our owning RecorderController is. So
128 // we'll just save the raw data for now and come back to it.
129 _data = scan.get_datagram();
130 _data_pos = scan.get_current_index();
131}
bamReader.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
parse_params
void parse_params(const FactoryParams &params, DatagramIterator &scan, BamReader *&manager)
Takes in a FactoryParams, passed from a WritableFactory into any TypedWritable's make function,...
Definition bamReader.I:275
bamWriter.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
BamReader
This is the fundamental interface for extracting binary objects from a Bam file, as generated by a Ba...
Definition bamReader.h:110
BamReader::read_pointer
bool read_pointer(DatagramIterator &scan)
The interface for reading a pointer to another object from a Bam file.
Definition bamReader.cxx:610
BamReader::get_factory
static WritableFactory * get_factory()
Returns the global WritableFactory for generating TypedWritable objects.
Definition bamReader.I:177
BamWriter::write_pointer
void write_pointer(Datagram &packet, const TypedWritable *dest)
The interface for writing a pointer to another object to a Bam file.
Definition bamWriter.cxx:317
DatagramIterator
A class to retrieve the individual data elements previously stored in a Datagram.
Definition datagramIterator.h:30
DatagramIterator::get_uint32
uint32_t get_uint32()
Extracts an unsigned 32-bit integer.
Definition datagramIterator.I:164
DatagramIterator::get_float64
PN_float64 get_float64()
Extracts a 64-bit floating-point number.
Definition datagramIterator.I:221
DatagramIterator::get_bool
bool get_bool()
Extracts a boolean value.
Definition datagramIterator.I:48
DatagramIterator::get_datagram
const Datagram & get_datagram() const
Return the datagram of this iterator.
Definition datagramIterator.I:462
DatagramIterator::get_current_index
size_t get_current_index() const
Returns the current position within the datagram of the next piece of data to extract.
Definition datagramIterator.I:471
DatagramIterator::get_remaining_size
size_t get_remaining_size() const
Return the bytes left in the datagram.
Definition datagramIterator.I:454
Datagram
An ordered list of data elements, formatted in memory for transmission over a socket or writing to a ...
Definition datagram.h:38
Datagram::add_uint32
void add_uint32(uint32_t value)
Adds an unsigned 32-bit integer to the datagram.
Definition datagram.I:94
Datagram::add_bool
void add_bool(bool value)
Adds a boolean value to the datagram.
Definition datagram.I:34
Datagram::add_float64
void add_float64(PN_float64 value)
Adds a 64-bit floating-point number to the datagram.
Definition datagram.I:123
FactoryParams
An instance of this class is passed to the Factory when requesting it to do its business and construc...
Definition factoryParams.h:36
Factory::register_factory
void register_factory(TypeHandle handle, CreateFunc *func, void *user_data=nullptr)
Registers a new kind of thing the Factory will be able to create.
Definition factory.I:73
RecorderFrame
This object represents one frame of data in the recorded session file.
Definition recorderFrame.h:32
RecorderFrame::play_frame
void play_frame(BamReader *manager)
Once the raw data has been read in from the session file, and the table has been decoded,...
Definition recorderFrame.cxx:27
RecorderFrame::write_datagram
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
Definition recorderFrame.cxx:48
RecorderFrame::complete_pointers
virtual int complete_pointers(TypedWritable **plist, BamReader *manager)
Receives an array of pointers, one for each time manager->read_pointer() was called in fillin().
Definition recorderFrame.cxx:83
RecorderFrame::register_with_read_factory
static void register_with_read_factory()
Tells the BamReader how to create objects of type Lens.
Definition recorderFrame.cxx:39
RecorderTable
This object is used by the RecorderController to write (and read) a record of the set of recorders in...
Definition recorderTable.h:32
TypeHandle
TypeHandle is the identifier used to differentiate C++ class types.
Definition typeHandle.h:81
TypedWritable
Base class for objects that can be written to and read from Bam files.
Definition typedWritable.h:35
TypedWritable::fillin
virtual void fillin(DatagramIterator &scan, BamReader *manager)
This internal function is intended to be called by each class's make_from_bam() method to read in all...
Definition typedWritable.cxx:103
TypedWritable::write_datagram
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
Definition typedWritable.cxx:54
TypedWritable::complete_pointers
virtual int complete_pointers(TypedWritable **p_list, BamReader *manager)
Receives an array of pointers, one for each time manager->read_pointer() was called in fillin().
Definition typedWritable.cxx:81
config_recorder.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
recorderFrame.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
recorderTable.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.