1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "EvsManager"
18
19 #include "HalCamera.h"
20 #include "VirtualCamera.h"
21 #include "Enumerator.h"
22
23 #include <ui/GraphicBufferAllocator.h>
24 #include <ui/GraphicBufferMapper.h>
25
26
27 namespace android {
28 namespace automotive {
29 namespace evs {
30 namespace V1_0 {
31 namespace implementation {
32
33
34 // TODO: We need to hook up death monitoring to detect stream death so we can attempt a reconnect
35
36
makeVirtualCamera()37 sp<VirtualCamera> HalCamera::makeVirtualCamera() {
38
39 // Create the client camera interface object
40 sp<VirtualCamera> client = new VirtualCamera(this);
41 if (client == nullptr) {
42 ALOGE("Failed to create client camera object");
43 return nullptr;
44 }
45
46 // Make sure we have enough buffers available for all our clients
47 if (!changeFramesInFlight(client->getAllowedBuffers())) {
48 // Gah! We couldn't get enough buffers, so we can't support this client
49 // Null the pointer, dropping our reference, thus destroying the client object
50 client = nullptr;
51 return nullptr;
52 }
53
54 // Add this client to our ownership list via weak pointer
55 mClients.push_back(client);
56
57 // Return the strong pointer to the client
58 return client;
59 }
60
61
disownVirtualCamera(sp<VirtualCamera> virtualCamera)62 void HalCamera::disownVirtualCamera(sp<VirtualCamera> virtualCamera) {
63 // Ignore calls with null pointers
64 if (virtualCamera.get() == nullptr) {
65 ALOGW("Ignoring disownVirtualCamera call with null pointer");
66 return;
67 }
68
69 // Make sure the virtual camera's stream is stopped
70 virtualCamera->stopVideoStream();
71
72 // Remove the virtual camera from our client list
73 unsigned clientCount = mClients.size();
74 mClients.remove(virtualCamera);
75 if (clientCount != mClients.size() + 1) {
76 ALOGE("Couldn't find camera in our client list to remove it");
77 }
78 virtualCamera->shutdown();
79
80 // Recompute the number of buffers required with the target camera removed from the list
81 if (!changeFramesInFlight(0)) {
82 ALOGE("Error when trying to reduce the in flight buffer count");
83 }
84 }
85
86
changeFramesInFlight(int delta)87 bool HalCamera::changeFramesInFlight(int delta) {
88 // Walk all our clients and count their currently required frames
89 unsigned bufferCount = 0;
90 for (auto&& client : mClients) {
91 sp<VirtualCamera> virtCam = client.promote();
92 if (virtCam != nullptr) {
93 bufferCount += virtCam->getAllowedBuffers();
94 }
95 }
96
97 // Add the requested delta
98 bufferCount += delta;
99
100 // Never drop below 1 buffer -- even if all client cameras get closed
101 if (bufferCount < 1) {
102 bufferCount = 1;
103 }
104
105 // Ask the hardware for the resulting buffer count
106 Return<EvsResult> result = mHwCamera->setMaxFramesInFlight(bufferCount);
107 bool success = (result.isOk() && result == EvsResult::OK);
108
109 // Update the size of our array of outstanding frame records
110 if (success) {
111 std::vector<FrameRecord> newRecords;
112 newRecords.reserve(bufferCount);
113
114 // Copy and compact the old records that are still active
115 for (const auto& rec : mFrames) {
116 if (rec.refCount > 0) {
117 newRecords.emplace_back(rec);
118 }
119 }
120 if (newRecords.size() > (unsigned)bufferCount) {
121 ALOGW("We found more frames in use than requested.");
122 }
123
124 mFrames.swap(newRecords);
125 }
126
127 return success;
128 }
129
130
clientStreamStarting()131 Return<EvsResult> HalCamera::clientStreamStarting() {
132 Return<EvsResult> result = EvsResult::OK;
133
134 if (mStreamState == STOPPED) {
135 result = mHwCamera->startVideoStream(this);
136 }
137
138 return result;
139 }
140
141
clientStreamEnding()142 void HalCamera::clientStreamEnding() {
143 // Do we still have a running client?
144 bool stillRunning = false;
145 for (auto&& client : mClients) {
146 sp<VirtualCamera> virtCam = client.promote();
147 if (virtCam != nullptr) {
148 stillRunning |= virtCam->isStreaming();
149 }
150 }
151
152 // If not, then stop the hardware stream
153 if (!stillRunning) {
154 mHwCamera->stopVideoStream();
155 }
156 }
157
158
doneWithFrame(const BufferDesc & buffer)159 Return<void> HalCamera::doneWithFrame(const BufferDesc& buffer) {
160 // Find this frame in our list of outstanding frames
161 unsigned i;
162 for (i=0; i<mFrames.size(); i++) {
163 if (mFrames[i].frameId == buffer.bufferId) {
164 break;
165 }
166 }
167 if (i == mFrames.size()) {
168 ALOGE("We got a frame back with an ID we don't recognize!");
169 } else {
170 // Are there still clients using this buffer?
171 mFrames[i].refCount--;
172 if (mFrames[i].refCount <= 0) {
173 // Since all our clients are done with this buffer, return it to the device layer
174 mHwCamera->doneWithFrame(buffer);
175 }
176 }
177
178 return Void();
179 }
180
181
deliverFrame(const BufferDesc & buffer)182 Return<void> HalCamera::deliverFrame(const BufferDesc& buffer) {
183 // Run through all our clients and deliver this frame to any who are eligible
184 unsigned frameDeliveries = 0;
185 for (auto&& client : mClients) {
186 sp<VirtualCamera> virtCam = client.promote();
187 if (virtCam != nullptr) {
188 if (virtCam->deliverFrame(buffer)) {
189 frameDeliveries++;
190 }
191 }
192 }
193
194 if (frameDeliveries < 1) {
195 // If none of our clients could accept the frame, then return it right away
196 ALOGI("Trivially rejecting frame with no acceptances");
197 mHwCamera->doneWithFrame(buffer);
198 } else {
199 // Add an entry for this frame in our tracking list
200 unsigned i;
201 for (i=0; i<mFrames.size(); i++) {
202 if (mFrames[i].refCount == 0) {
203 break;
204 }
205 }
206 if (i == mFrames.size()) {
207 mFrames.emplace_back(buffer.bufferId);
208 } else {
209 mFrames[i].frameId = buffer.bufferId;
210 }
211 mFrames[i].refCount = frameDeliveries;
212 }
213
214 return Void();
215 }
216
217 } // namespace implementation
218 } // namespace V1_0
219 } // namespace evs
220 } // namespace automotive
221 } // namespace android
222