1 /*
2 * Copyright (C) 2019 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_NDEBUG 0
18 #define LOG_TAG "GCH_BasicResultProcessor"
19 #define ATRACE_TAG ATRACE_TAG_CAMERA
20 #include <log/log.h>
21 #include <utils/Trace.h>
22
23 #include <inttypes.h>
24
25 #include "basic_result_processor.h"
26 #include "hal_utils.h"
27
28 namespace android {
29 namespace google_camera_hal {
30
~BasicResultProcessor()31 BasicResultProcessor::~BasicResultProcessor() {
32 // Avoid a possible timing issue that could result
33 // in invalid memory access. Once 'process_capture_result_'
34 // in 'ProcessResult' returns on the very last buffer of the
35 // last pending request, camera service will be able to
36 // re-configure the camera streams at any time. Depending
37 // on scheduling the current 'BasicResultProcessor' instance
38 // might be destroyed before 'ProcessResult' is able to
39 // unlock 'callback_lock_' which will result in undefined behavior.
40 // To resolve this block the destructor until the result
41 // callback is able to correctly unlock the mutex.
42 std::lock_guard<std::mutex> lock(callback_lock_);
43 }
44
Create()45 std::unique_ptr<BasicResultProcessor> BasicResultProcessor::Create() {
46 auto result_processor =
47 std::unique_ptr<BasicResultProcessor>(new BasicResultProcessor());
48 if (result_processor == nullptr) {
49 ALOGE("%s: Creating BasicResultProcessor failed.", __FUNCTION__);
50 return nullptr;
51 }
52
53 return result_processor;
54 }
55
SetResultCallback(ProcessCaptureResultFunc process_capture_result,NotifyFunc notify)56 void BasicResultProcessor::SetResultCallback(
57 ProcessCaptureResultFunc process_capture_result, NotifyFunc notify) {
58 ATRACE_CALL();
59 std::lock_guard<std::mutex> lock(callback_lock_);
60 process_capture_result_ = process_capture_result;
61 notify_ = notify;
62 }
63
AddPendingRequests(const std::vector<ProcessBlockRequest> & process_block_requests,const CaptureRequest & remaining_session_request)64 status_t BasicResultProcessor::AddPendingRequests(
65 const std::vector<ProcessBlockRequest>& process_block_requests,
66 const CaptureRequest& remaining_session_request) {
67 ATRACE_CALL();
68 // This is the last result processor. Sanity check if requests contains
69 // all remaining output buffers.
70 if (!hal_utils::AreAllRemainingBuffersRequested(process_block_requests,
71 remaining_session_request)) {
72 ALOGE("%s: Some output buffers will not be completed.", __FUNCTION__);
73 return BAD_VALUE;
74 }
75
76 return OK;
77 }
78
ProcessResult(ProcessBlockResult block_result)79 void BasicResultProcessor::ProcessResult(ProcessBlockResult block_result) {
80 ATRACE_CALL();
81 std::lock_guard<std::mutex> lock(callback_lock_);
82 if (block_result.result == nullptr) {
83 ALOGW("%s: Received a nullptr result.", __FUNCTION__);
84 return;
85 }
86
87 if (process_capture_result_ == nullptr) {
88 ALOGE("%s: process_capture_result_ is nullptr. Dropping a result.",
89 __FUNCTION__);
90 return;
91 }
92
93 process_capture_result_(std::move(block_result.result));
94 }
95
Notify(const ProcessBlockNotifyMessage & block_message)96 void BasicResultProcessor::Notify(const ProcessBlockNotifyMessage& block_message) {
97 ATRACE_CALL();
98 std::lock_guard<std::mutex> lock(callback_lock_);
99 if (notify_ == nullptr) {
100 ALOGE("%s: notify_ is nullptr. Dropping a message.", __FUNCTION__);
101 return;
102 }
103
104 notify_(block_message.message);
105 }
106
FlushPendingRequests()107 status_t BasicResultProcessor::FlushPendingRequests() {
108 ATRACE_CALL();
109 return INVALID_OPERATION;
110 }
111
112 } // namespace google_camera_hal
113 } // namespace android
114