1 /*
2 * Copyright (c) 2022-2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "constants.h"
17 #include "dcamera_low_latency.h"
18 #include "device_type.h"
19 #include "distributed_camera_errno.h"
20 #include "distributed_hardware_log.h"
21 #include "ipublisher_listener.h"
22 #include "cJSON.h"
23
24 namespace OHOS {
25 namespace DistributedHardware {
26 IMPLEMENT_SINGLE_INSTANCE(DCameraLowLatency);
27
EnableLowLatency()28 int32_t DCameraLowLatency::EnableLowLatency()
29 {
30 DHLOGD("Enable low latency start.");
31 if (refCount_ > REF_INITIAL) {
32 refCount_++;
33 DHLOGD("No need to enable low latency, refCount just plus one and now is: %{public}d.", refCount_.load());
34 return DCAMERA_OK;
35 }
36 std::shared_ptr<DistributedHardwareFwkKit> dHFwkKit = GetDHFwkKit();
37 if (dHFwkKit == nullptr) {
38 DHLOGE("Get dHFwkKit is null when enable low latency.");
39 return DCAMERA_BAD_VALUE;
40 }
41 cJSON *rootValue = cJSON_CreateObject();
42 if (rootValue == nullptr) {
43 return DCAMERA_BAD_VALUE;
44 }
45 cJSON_AddItemToObject(rootValue, DH_TYPE.c_str(), cJSON_CreateNumber(static_cast<uint32_t>(DHType::CAMERA)));
46 cJSON_AddItemToObject(rootValue, LOW_LATENCY_ENABLE.c_str(), cJSON_CreateBool(true));
47 char *jsonstr = cJSON_Print(rootValue);
48 if (jsonstr == nullptr) {
49 cJSON_Delete(rootValue);
50 return DCAMERA_BAD_VALUE;
51 }
52 dHFwkKit->PublishMessage(DHTopic::TOPIC_LOW_LATENCY, std::string(jsonstr));
53 refCount_++;
54 DHLOGD("Enable low latency success and now refCount is: %d", refCount_.load());
55 cJSON_Delete(rootValue);
56 cJSON_free(jsonstr);
57 return DCAMERA_OK;
58 }
59
DisableLowLatency()60 int32_t DCameraLowLatency::DisableLowLatency()
61 {
62 DHLOGD("Disable low latency start.");
63 if (refCount_ == REF_INITIAL) {
64 DHLOGD("No need to disable low latency, refCount is zero.");
65 return DCAMERA_OK;
66 }
67 if (refCount_ > REF_NORMAL) {
68 refCount_--;
69 DHLOGD("No need to disable low latency, refCount just minus one and now is: %{public}d.", refCount_.load());
70 return DCAMERA_OK;
71 }
72 std::shared_ptr<DistributedHardwareFwkKit> dHFwkKit = GetDHFwkKit();
73 if (dHFwkKit == nullptr) {
74 DHLOGE("Get dHFwkKit is null when disable low latency.");
75 return DCAMERA_BAD_VALUE;
76 }
77 cJSON *rootValue = cJSON_CreateObject();
78 if (rootValue == nullptr) {
79 return DCAMERA_BAD_VALUE;
80 }
81 cJSON_AddItemToObject(rootValue, DH_TYPE.c_str(), cJSON_CreateNumber(static_cast<uint32_t>(DHType::CAMERA)));
82 cJSON_AddItemToObject(rootValue, LOW_LATENCY_ENABLE.c_str(), cJSON_CreateBool(false));
83 char *jsonstr = cJSON_Print(rootValue);
84 if (jsonstr == nullptr) {
85 cJSON_Delete(rootValue);
86 return DCAMERA_BAD_VALUE;
87 }
88 dHFwkKit->PublishMessage(DHTopic::TOPIC_LOW_LATENCY, std::string(jsonstr));
89 refCount_--;
90 DHLOGD("Disable low latency success.");
91 cJSON_Delete(rootValue);
92 cJSON_free(jsonstr);
93 return DCAMERA_OK;
94 }
95
GetDHFwkKit()96 std::shared_ptr<DistributedHardwareFwkKit> DCameraLowLatency::GetDHFwkKit()
97 {
98 if (dHFwkKit_ == nullptr) {
99 std::lock_guard<std::mutex> lock(dHFwkKitMutex_);
100 if (dHFwkKit_ == nullptr) {
101 dHFwkKit_ = std::make_shared<DistributedHardwareFwkKit>();
102 }
103 }
104 return dHFwkKit_;
105 }
106 } // namespace DistributedHardware
107 } // namespace OHOS