1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Raspberry Pi (Trading) Ltd.
*
* rpi_stream.cpp - Raspberry Pi device stream abstraction class.
*/
#include "rpi_stream.h"
#include "libcamera/internal/log.h"
namespace libcamera {
LOG_DEFINE_CATEGORY(RPISTREAM)
namespace RPi {
V4L2VideoDevice *RPiStream::dev() const
{
return dev_.get();
}
std::string RPiStream::name() const
{
return name_;
}
void RPiStream::reset()
{
external_ = false;
clearBuffers();
}
void RPiStream::setExternal(bool external)
{
/* Import streams cannot be external. */
ASSERT(!external || !importOnly_);
external_ = external;
}
bool RPiStream::isExternal() const
{
return external_;
}
void RPiStream::setExportedBuffers(std::vector<std::unique_ptr<FrameBuffer>> *buffers)
{
std::transform(buffers->begin(), buffers->end(), std::back_inserter(bufferList_),
[](std::unique_ptr<FrameBuffer> &b) { return b.get(); });
}
const std::vector<FrameBuffer *> &RPiStream::getBuffers() const
{
return bufferList_;
}
bool RPiStream::findFrameBuffer(FrameBuffer *buffer) const
{
if (importOnly_)
return false;
if (std::find(bufferList_.begin(), bufferList_.end(), buffer) != bufferList_.end())
return true;
return false;
}
int RPiStream::prepareBuffers(unsigned int count)
{
int ret;
if (!importOnly_) {
if (count) {
/* Export some frame buffers for internal use. */
ret = dev_->exportBuffers(count, &internalBuffers_);
if (ret < 0)
return ret;
/* Add these exported buffers to the internal/external buffer list. */
setExportedBuffers(&internalBuffers_);
/* Add these buffers to the queue of internal usable buffers. */
for (auto const &buffer : internalBuffers_)
availableBuffers_.push(buffer.get());
}
/* We must import all internal/external exported buffers. */
count = bufferList_.size();
}
return dev_->importBuffers(count);
}
int RPiStream::queueBuffer(FrameBuffer *buffer)
{
/*
* A nullptr buffer implies an external stream, but no external
* buffer has been supplied. So, pick one from the availableBuffers_
* queue.
*/
if (!buffer) {
if (availableBuffers_.empty()) {
LOG(RPISTREAM, Warning) << "No buffers available for "
<< name_;
return -EINVAL;
}
buffer = availableBuffers_.front();
availableBuffers_.pop();
}
LOG(RPISTREAM, Debug) << "Queuing buffer " << buffer->cookie()
<< " for " << name_;
int ret = dev_->queueBuffer(buffer);
if (ret) {
LOG(RPISTREAM, Error) << "Failed to queue buffer for "
<< name_;
}
return ret;
}
void RPiStream::returnBuffer(FrameBuffer *buffer)
{
/* This can only be called for external streams. */
assert(external_);
availableBuffers_.push(buffer);
}
int RPiStream::queueAllBuffers()
{
int ret;
if (external_)
return 0;
while (!availableBuffers_.empty()) {
ret = queueBuffer(availableBuffers_.front());
if (ret < 0)
return ret;
availableBuffers_.pop();
}
return 0;
}
void RPiStream::releaseBuffers()
{
dev_->releaseBuffers();
clearBuffers();
}
void RPiStream::clearBuffers()
{
availableBuffers_ = std::queue<FrameBuffer *>{};
internalBuffers_.clear();
bufferList_.clear();
}
} /* namespace RPi */
} /* namespace libcamera */
|
