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199 lines
7.4 KiB
199 lines
7.4 KiB
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef HARDWARE_GOOGLE_CAMERA_HAL_UTILS_RESULT_DISPATCHER_H_
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#define HARDWARE_GOOGLE_CAMERA_HAL_UTILS_RESULT_DISPATCHER_H_
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#include <map>
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#include <thread>
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#include "hal_types.h"
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namespace android {
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namespace google_camera_hal {
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// ResultDispatcher dispatches capture results in the order of frame numbers,
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// including result metadata, shutters, and stream buffers.
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//
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// The client can add results and shutters via AddResult() and AddShutter() in
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// any order. ResultDispatcher will invoke ProcessCaptureResultFunc and
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// NotifyFunc to notify result metadata, shutters, and stream buffers in the
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// in the order of increasing frame numbers.
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class ResultDispatcher {
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public:
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// Create a ResultDispatcher.
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// partial_result_count is the partial result count.
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// process_capture_result is the function to notify capture results.
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// notify is the function to notify shutter messages.
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static std::unique_ptr<ResultDispatcher> Create(
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uint32_t partial_result_count,
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ProcessCaptureResultFunc process_capture_result, NotifyFunc notify);
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virtual ~ResultDispatcher();
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// Add a pending request. This tells ResultDispatcher to watch for
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// the shutter, result metadata, and stream buffers for this request,
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// that will be added later via AddResult() and AddShutter().
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status_t AddPendingRequest(const CaptureRequest& pending_request);
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// Add a ready result. If the result doesn't belong to a pending request that
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// was previously added via AddPendingRequest(), an error will be returned.
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status_t AddResult(std::unique_ptr<CaptureResult> result);
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// Add a shutter for a frame number. If the frame number doesn't belong to a
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// pending request that was previously added via AddPendingRequest(), an error
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// will be returned.
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status_t AddShutter(uint32_t frame_number, int64_t timestamp_ns);
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// Add an error notification for a frame number. When this is called, we no
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// longer wait for a shutter message or result metadata for the given frame.
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status_t AddError(const ErrorMessage& error);
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// Remove a pending request.
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void RemovePendingRequest(uint32_t frame_number);
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protected:
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ResultDispatcher(uint32_t partial_result_count,
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ProcessCaptureResultFunc process_capture_result,
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NotifyFunc notify);
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private:
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static constexpr uint32_t kCallbackThreadTimeoutMs = 500;
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const uint32_t kPartialResultCount;
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// Define a pending shutter that will be ready later when AddShutter() is
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// called.
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struct PendingShutter {
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int64_t timestamp_ns = 0;
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bool ready = false;
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};
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// Define a pending buffer that will be ready later when AddResult() is called.
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struct PendingBuffer {
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StreamBuffer buffer = {};
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bool is_input = false;
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bool ready = false;
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};
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// Define a pending final result metadata that will be ready later when
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// AddResult() is called.
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struct PendingFinalResultMetadata {
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std::unique_ptr<HalCameraMetadata> metadata;
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std::vector<PhysicalCameraMetadata> physical_metadata;
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bool ready = false;
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};
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// Add a pending request for a frame. Must be protected with result_lock_.
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status_t AddPendingRequestLocked(const CaptureRequest& pending_request);
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// Add a pending shutter for a frame. Must be protected with result_lock_.
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status_t AddPendingShutterLocked(uint32_t frame_number);
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// Add a pending final metadata for a frame. Must be protected with
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// result_lock_.
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status_t AddPendingFinalResultMetadataLocked(uint32_t frame_number);
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// Add a pending buffer for a frame. Must be protected with result_lock_.
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status_t AddPendingBufferLocked(uint32_t frame_number,
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const StreamBuffer& buffer, bool is_input);
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// Remove pending shutter, result metadata, and buffers for a frame number.
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void RemovePendingRequestLocked(uint32_t frame_number);
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// Invoke process_capture_result_ to notify metadata.
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void NotifyResultMetadata(uint32_t frame_number,
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std::unique_ptr<HalCameraMetadata> metadata,
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std::vector<PhysicalCameraMetadata> physical_metadata,
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uint32_t partial_result);
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status_t AddFinalResultMetadata(
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uint32_t frame_number, std::unique_ptr<HalCameraMetadata> final_metadata,
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std::vector<PhysicalCameraMetadata> physical_metadata);
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status_t AddResultMetadata(
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uint32_t frame_number, std::unique_ptr<HalCameraMetadata> metadata,
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std::vector<PhysicalCameraMetadata> physical_metadata,
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uint32_t partial_result);
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status_t AddBuffer(uint32_t frame_number, StreamBuffer buffer);
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// Get a shutter message that is ready to be notified via notify_.
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status_t GetReadyShutterMessage(NotifyMessage* message);
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// Get a final metadata that is ready to be notified via
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// process_capture_result_.
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status_t GetReadyFinalMetadata(
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uint32_t* frame_number, std::unique_ptr<HalCameraMetadata>* final_metadata,
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std::vector<PhysicalCameraMetadata>* physical_metadata);
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// Get a result with a buffer that is ready to be notified via
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// process_capture_result_.
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status_t GetReadyBufferResult(std::unique_ptr<CaptureResult>* result);
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// Check all pending shutters and invoke notify_ with shutters that are ready.
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void NotifyShutters();
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// Check all pending final result metadata and invoke process_capture_result_
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// with final result metadata that are ready.
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void NotifyFinalResultMetadata();
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// Check all pending buffers and invoke notify_ with buffers that are ready.
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void NotifyBuffers();
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// Thread loop to check pending shutters, result metadata, and buffers. It
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// notifies the client when one is ready.
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void NotifyCallbackThreadLoop();
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void PrintTimeoutMessages();
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std::mutex result_lock_;
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// Maps from frame numbers to pending shutters.
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// Protected by result_lock_.
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std::map<uint32_t, PendingShutter> pending_shutters_;
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// Maps from a stream ID to "a map from a frame number to a pending buffer."
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// Protected by result_lock_.
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std::map<uint32_t, std::map<uint32_t, PendingBuffer>> stream_pending_buffers_map_;
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// Maps from a stream ID to pending result metadata.
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// Protected by result_lock_.
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std::map<uint32_t, PendingFinalResultMetadata> pending_final_metadata_;
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std::mutex process_capture_result_lock_;
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ProcessCaptureResultFunc process_capture_result_;
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NotifyFunc notify_;
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// A thread to run NotifyCallbackThreadLoop().
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std::thread notify_callback_thread_;
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std::mutex notify_callback_lock;
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// Condition to wake up notify_callback_thread_. Used with notify_callback_lock.
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std::condition_variable notify_callback_condition_;
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// Protected by notify_callback_lock.
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bool notify_callback_thread_exiting = false;
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// State of callback thread is notified or not.
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volatile bool is_result_shutter_updated_ = false;
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};
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} // namespace google_camera_hal
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} // namespace android
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#endif // HARDWARE_GOOGLE_CAMERA_HAL_UTILS_RESULT_DISPATCHER_H_
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