src/android/mm/cros_camera_buffer.cpp


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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2021, Google Inc.
 *
 * Chromium OS buffer backend using CameraBufferManager
 */

#include "../camera_buffer.h"

#include <libcamera/base/log.h>

#include "cros-camera/camera_buffer_manager.h"

using namespace libcamera;

LOG_DECLARE_CATEGORY(HAL)

class CameraBuffer::Private : public Extensible::Private
{
	LIBCAMERA_DECLARE_PUBLIC(CameraBuffer)

public:
	Private(CameraBuffer *cameraBuffer, buffer_handle_t camera3Buffer,
		PixelFormat pixelFormat, const Size &size,
		int flags);
	~Private();

	bool isValid() const { return registered_; }

	unsigned int numPlanes() const;

	Span<uint8_t> plane(unsigned int plane);

	unsigned int stride(unsigned int plane) const;
	unsigned int offset(unsigned int plane) const;
	unsigned int size(unsigned int plane) const;

	size_t jpegBufferSize(size_t maxJpegBufferSize) const;

private:
	void map();

	cros::CameraBufferManager *bufferManager_;
	buffer_handle_t handle_;
	unsigned int numPlanes_;
	bool mapped_;
	bool registered_;
	union {
		void *addr;
		android_ycbcr ycbcr;
	} mem;
};

CameraBuffer::Private::Private([[maybe_unused]] CameraBuffer *cameraBuffer,
			       buffer_handle_t camera3Buffer,
			       [[maybe_unused]] PixelFormat pixelFormat,
			       [[maybe_unused]] const Size &size,
			       [[maybe_unused]] int flags)
	: handle_(camera3Buffer), numPlanes_(0), mapped_(false),
	  registered_(false)
{
	bufferManager_ = cros::CameraBufferManager::GetInstance();
	if (!bufferManager_) {
		LOG(HAL, Fatal)
			<< "Failed to get cros CameraBufferManager instance";
		return;
	}

	int ret = bufferManager_->Register(camera3Buffer);
	if (ret) {
		LOG(HAL, Error) << "Failed registering a buffer: " << ret;
		return;
	}

	registered_ = true;
	numPlanes_ = bufferManager_->GetNumPlanes(camera3Buffer);
}

CameraBuffer::Private::~Private()
{
	int ret;
	if (mapped_) {
		ret = bufferManager_->Unlock(handle_);
		if (ret != 0)
			LOG(HAL, Error) << "Failed to unlock buffer: "
					<< strerror(-ret);
	}

	if (registered_) {
		ret = bufferManager_->Deregister(handle_);
		if (ret != 0)
			LOG(HAL, Error) << "Failed to deregister buffer: "
					<< strerror(-ret);
	}
}

unsigned int CameraBuffer::Private::numPlanes() const
{
	return bufferManager_->GetNumPlanes(handle_);
}

Span<uint8_t> CameraBuffer::Private::plane(unsigned int plane)
{
	if (!mapped_)
		map();
	if (!mapped_)
		return {};

	void *addr;

	switch (numPlanes()) {
	case 1:
		addr = mem.addr;
		break;
	default:
		switch (plane) {
		case 0:
			addr = mem.ycbcr.y;
			break;
		case 1:
			addr = mem.ycbcr.cb;
			break;
		case 2:
			addr = mem.ycbcr.cr;
			break;
		}
	}

	return { static_cast<uint8_t *>(addr),
		 bufferManager_->GetPlaneSize(handle_, plane) };
}

unsigned int CameraBuffer::Private::stride(unsigned int plane) const
{
	return cros::CameraBufferManager::GetPlaneStride(handle_, plane);
}

unsigned int CameraBuffer::Private::offset(unsigned int plane) const
{
	return cros::CameraBufferManager::GetPlaneOffset(handle_, plane);
}

unsigned int CameraBuffer::Private::size(unsigned int plane) const
{
	return cros::CameraBufferManager::GetPlaneSize(handle_, plane);
}

size_t CameraBuffer::Private::jpegBufferSize([[maybe_unused]] size_t maxJpegBufferSize) const
{
	return bufferManager_->GetPlaneSize(handle_, 0);
}

void CameraBuffer::Private::map()
{
	int ret;
	switch (numPlanes_) {
	case 1: {
		ret = bufferManager_->Lock(handle_, 0, 0, 0, 0, 0, &mem.addr);
		if (ret) {
			LOG(HAL, Error) << "Single plane buffer mapping failed";
			return;
		}
		break;
	}
	case 2:
	case 3: {
		ret = bufferManager_->LockYCbCr(handle_, 0, 0, 0, 0, 0,
						&mem.ycbcr);
		if (ret) {
			LOG(HAL, Error) << "YCbCr buffer mapping failed";
			return;
		}
		break;
	}
	default:
		LOG(HAL, Error) << "Invalid number of planes: " << numPlanes_;
		return;
	}

	mapped_ = true;
	return;
}

PUBLIC_CAMERA_BUFFER_IMPLEMENTATION