1 /* 2 * Copyright (C) 2018 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 package android.hardware.camera.device@3.5; 18 19 import @3.2::StreamBuffer; 20 import @3.4::ICameraDeviceCallback; 21 22 /** 23 * Callback methods for the HAL to call into the framework. 24 */ 25 interface ICameraDeviceCallback extends @3.4::ICameraDeviceCallback { 26 27 /** 28 * requestStreamBuffers: 29 * 30 * Synchronous callback for HAL to ask for output buffers from camera service. 31 * 32 * This call may be serialized in camera service so it is strongly 33 * recommended to only call this method from one thread. 34 * 35 * When camera device advertises 36 * (CameraMetadataEnumAndroidInfoSupportedBufferManagementVersion == 37 * ANDROID_INFO_SUPPORTED_BUFFER_MANAGEMENT_VERSION_HIDL_DEVICE_3_5), HAL 38 * can use this method to request buffers from camera service. 39 * 40 * @return status Status code for the operation, one of: 41 * OK: all requested buffers are returned 42 * FAILED_PARTIAL: some streams failed while some succeeds. Check 43 * individual StreamBufferRet for details. 44 * FAILED_CONFIGURING: the request failed because camera servicve is 45 * performing configureStreams and no buffers are returned. 46 * FAILED_UNKNOWN: the request failed for unknown reason and no buffers 47 * are returned. 48 * 49 * Performance requirements: 50 * This is a blocking call that takes more time with more buffers requested. 51 * HAL must not request large amount of buffers on a latency critical code 52 * path. It is highly recommended to use a dedicated thread to perform 53 * all requestStreamBuffers calls, and adjust the thread priority and/or 54 * timing of making the call in order for buffers to arrive before HAL is 55 * ready to fill the buffer. 56 */ 57 requestStreamBuffers(vec<BufferRequest> bufReqs) 58 generates (BufferRequestStatus st, vec<StreamBufferRet> buffers); 59 60 /** 61 * returnStreamBuffers: 62 * 63 * Synchronous callback for HAL to return output buffers to camera service. 64 * 65 * If this method is called during a configureStreams call, it must be blocked 66 * until camera service finishes the ongoing configureStreams call. 67 */ 68 returnStreamBuffers(vec<StreamBuffer> buffers); 69 70 }; 71
