1 /* 2 * Copyright (c) 2021-2022 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 OHOS_CAMERA_PREVIEW_OUTPUT_H 17 #define OHOS_CAMERA_PREVIEW_OUTPUT_H 18 19 #include "capture_output.h" 20 #include "istream_repeat.h" 21 #include "istream_repeat_callback.h" 22 23 namespace OHOS { 24 namespace CameraStandard { 25 class PreviewStateCallback { 26 public: 27 PreviewStateCallback() = default; 28 virtual ~PreviewStateCallback() = default; 29 30 /** 31 * @brief Called when preview frame is started rendering. 32 */ 33 virtual void OnFrameStarted() const = 0; 34 35 /** 36 * @brief Called when preview frame is ended. 37 * 38 * @param frameCount Indicates number of frames captured. 39 */ 40 virtual void OnFrameEnded(const int32_t frameCount) const = 0; 41 42 /** 43 * @brief Called when error occured during preview rendering. 44 * 45 * @param errorCode Indicates a {@link ErrorCode} which will give information for preview callback error. 46 */ 47 virtual void OnError(const int32_t errorCode) const = 0; 48 }; 49 50 class PreviewOutput : public CaptureOutput { 51 public: 52 explicit PreviewOutput(sptr<IStreamRepeat> &streamRepeat); 53 virtual ~PreviewOutput(); 54 55 /** 56 * @brief Set the preview callback for the preview output. 57 * 58 * @param PreviewStateCallback to be triggered. 59 */ 60 void SetCallback(std::shared_ptr<PreviewStateCallback> callback); 61 62 /** 63 * @brief Releases a instance of the preview output. 64 */ 65 int32_t Release() override; 66 67 /** 68 * @brief Add delayed preview surface. 69 * 70 * @param surface to add. 71 */ 72 void AddDeferredSurface(sptr<Surface> surface); 73 74 /** 75 * @brief Start preview stream. 76 */ 77 int32_t Start(); 78 79 /** 80 * @brief stop preview stream. 81 */ 82 int32_t Stop(); 83 84 /** 85 * @brief Get the application callback information. 86 * 87 * @return Returns the pointer application callback. 88 */ 89 std::shared_ptr<PreviewStateCallback> GetApplicationCallback(); 90 91 private: 92 std::shared_ptr<PreviewStateCallback> appCallback_; 93 sptr<IStreamRepeatCallback> svcCallback_; 94 }; 95 } // namespace CameraStandard 96 } // namespace OHOS 97 #endif // OHOS_CAMERA_PREVIEW_OUTPUT_H 98 99