1 /*
2  * Copyright (C) 2023 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 #ifndef MEDIA_DATA_SOURCE_CALLBACK_H
17 #define MEDIA_DATA_SOURCE_CALLBACK_H
18 
19 #include <mutex>
20 #include <uv.h>
21 #include "media_data_source.h"
22 #include "common_napi.h"
23 #include "napi/native_api.h"
24 #include "napi/native_node_api.h"
25 #include "nocopyable.h"
26 
27 namespace OHOS {
28 namespace Media {
29 const std::string READAT_CALLBACK_NAME = "readAt";
30 
31 struct MediaDataSourceJsCallback {
MediaDataSourceJsCallbackMediaDataSourceJsCallback32     MediaDataSourceJsCallback(const std::string &callbackName, const std::shared_ptr<AVSharedMemory> &mem,
33         uint32_t length, int64_t pos)
34         :callbackName_(callbackName), memory_(mem), length_(length), pos_(pos) {
35     }
36     ~MediaDataSourceJsCallback();
37     void WaitResult();
38     std::weak_ptr<AutoRef> callback_;
39     std::string callbackName_;
40     std::shared_ptr<AVSharedMemory> memory_;
41     uint32_t length_;
42     int64_t pos_;
43     int32_t readSize_ = 0;
44     std::mutex mutexCond_;
45     std::condition_variable cond_;
46     bool setResult_ = false;
47     bool isExit_ = false;
48 };
49 
50 struct MediaDataSourceJsCallbackWraper {
51     std::weak_ptr<MediaDataSourceJsCallback> cb_;
52 };
53 
54 class MediaDataSourceCallback : public IMediaDataSource, public NoCopyable {
55 public:
56     MediaDataSourceCallback(napi_env env, int64_t fileSize);
57     virtual ~MediaDataSourceCallback();
58     int32_t ReadAt(const std::shared_ptr<AVSharedMemory> &mem, uint32_t length, int64_t pos = -1) override;
59     int32_t GetSize(int64_t &size) override;
60     void SaveCallbackReference(const std::string &name, std::shared_ptr<AutoRef> ref);
61     int32_t GetCallback(const std::string &name, napi_value *callback);
62     void ClearCallbackReference();
63     static bool AddNapiValueProp(napi_env env, napi_value obj, const std::string &key, napi_value value);
64 
65     // This interface has been deprecated
66     int32_t ReadAt(int64_t pos, uint32_t length, const std::shared_ptr<AVSharedMemory> &mem) override;
67     // This interface has been deprecated
68     int32_t ReadAt(uint32_t length, const std::shared_ptr<AVSharedMemory> &mem) override;
69 private:
70     int32_t UvWork(uv_loop_s *loop, uv_work_t *work);
71     std::mutex mutex_;
72     napi_env env_ = nullptr;
73     std::map<std::string, std::shared_ptr<AutoRef>> refMap_;
74     int64_t size_ = -1;
75     std::shared_ptr<MediaDataSourceJsCallback> cb_ = nullptr;
76 };
77 } // namespace Media
78 } // namespace OHOS
79 #endif // MEDIA_DATA_SOURCE_CALLBACK_H
80