| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ANDROID_SERVERS_CAMERA3_STREAM_H |
| #define ANDROID_SERVERS_CAMERA3_STREAM_H |
| |
| #include <gui/Surface.h> |
| #include <utils/RefBase.h> |
| #include <utils/String8.h> |
| #include <utils/String16.h> |
| #include <utils/List.h> |
| |
| #include "hardware/camera3.h" |
| |
| #include "Camera3StreamBufferListener.h" |
| #include "Camera3StreamInterface.h" |
| |
| namespace android { |
| |
| namespace camera3 { |
| |
| /** |
| * A class for managing a single stream of input or output data from the camera |
| * device. |
| * |
| * The stream has an internal state machine to track whether it's |
| * connected/configured/etc. |
| * |
| * States: |
| * |
| * STATE_ERROR: A serious error has occurred, stream is unusable. Outstanding |
| * buffers may still be returned. |
| * |
| * STATE_CONSTRUCTED: The stream is ready for configuration, but buffers cannot |
| * be gotten yet. Not connected to any endpoint, no buffers are registered |
| * with the HAL. |
| * |
| * STATE_IN_CONFIG: Configuration has started, but not yet concluded. During this |
| * time, the usage, max_buffers, and priv fields of camera3_stream returned by |
| * startConfiguration() may be modified. |
| * |
| * STATE_IN_RE_CONFIG: Configuration has started, and the stream has been |
| * configured before. Need to track separately from IN_CONFIG to avoid |
| * re-registering buffers with HAL. |
| * |
| * STATE_CONFIGURED: Stream is configured, and has registered buffers with the |
| * HAL (if necessary). The stream's getBuffer/returnBuffer work. The priv |
| * pointer may still be modified. |
| * |
| * STATE_PREPARING: The stream's buffers are being pre-allocated for use. On |
| * older HALs, this is done as part of configuration, but in newer HALs |
| * buffers may be allocated at time of first use. But some use cases require |
| * buffer allocation upfront, to minmize disruption due to lengthy allocation |
| * duration. In this state, only prepareNextBuffer() and cancelPrepare() |
| * may be called. |
| * |
| * Transition table: |
| * |
| * <none> => STATE_CONSTRUCTED: |
| * When constructed with valid arguments |
| * <none> => STATE_ERROR: |
| * When constructed with invalid arguments |
| * STATE_CONSTRUCTED => STATE_IN_CONFIG: |
| * When startConfiguration() is called |
| * STATE_IN_CONFIG => STATE_CONFIGURED: |
| * When finishConfiguration() is called |
| * STATE_IN_CONFIG => STATE_ERROR: |
| * When finishConfiguration() fails to allocate or register buffers. |
| * STATE_CONFIGURED => STATE_IN_RE_CONFIG: * |
| * When startConfiguration() is called again, after making sure stream is |
| * idle with waitUntilIdle(). |
| * STATE_IN_RE_CONFIG => STATE_CONFIGURED: |
| * When finishConfiguration() is called. |
| * STATE_IN_RE_CONFIG => STATE_ERROR: |
| * When finishConfiguration() fails to allocate or register buffers. |
| * STATE_CONFIGURED => STATE_CONSTRUCTED: |
| * When disconnect() is called after making sure stream is idle with |
| * waitUntilIdle(). |
| * STATE_CONFIGURED => STATE_PREPARING: |
| * When startPrepare is called before the stream has a buffer |
| * queued back into it for the first time. |
| * STATE_PREPARING => STATE_CONFIGURED: |
| * When sufficient prepareNextBuffer calls have been made to allocate |
| * all stream buffers, or cancelPrepare is called. |
| * STATE_CONFIGURED => STATE_ABANDONED: |
| * When the buffer queue of the stream is abandoned. |
| * |
| * Status Tracking: |
| * Each stream is tracked by StatusTracker as a separate component, |
| * depending on the handed out buffer count. The state must be STATE_CONFIGURED |
| * in order for the component to be marked. |
| * |
| * It's marked in one of two ways: |
| * |
| * - ACTIVE: One or more buffers have been handed out (with #getBuffer). |
| * - IDLE: All buffers have been returned (with #returnBuffer), and their |
| * respective release_fence(s) have been signaled. |
| * |
| * A typical use case is output streams. When the HAL has any buffers |
| * dequeued, the stream is marked ACTIVE. When the HAL returns all buffers |
| * (e.g. if no capture requests are active), the stream is marked IDLE. |
| * In this use case, the app consumer does not affect the component status. |
| * |
| */ |
| class Camera3Stream : |
| protected camera3_stream, |
| public virtual Camera3StreamInterface, |
| public virtual RefBase { |
| public: |
| |
| virtual ~Camera3Stream(); |
| |
| static Camera3Stream* cast(camera3_stream *stream); |
| static const Camera3Stream* cast(const camera3_stream *stream); |
| |
| /** |
| * Get the stream's ID |
| */ |
| int getId() const; |
| |
| /** |
| * Get the output stream set id. |
| */ |
| int getStreamSetId() const; |
| |
| /** |
| * Get the stream's dimensions and format |
| */ |
| uint32_t getWidth() const; |
| uint32_t getHeight() const; |
| int getFormat() const; |
| android_dataspace getDataSpace() const; |
| |
| /** |
| * Start the stream configuration process. Returns a handle to the stream's |
| * information to be passed into the HAL device's configure_streams call. |
| * |
| * Until finishConfiguration() is called, no other methods on the stream may be |
| * called. The usage and max_buffers fields of camera3_stream may be modified |
| * between start/finishConfiguration, but may not be changed after that. |
| * The priv field of camera3_stream may be modified at any time after |
| * startConfiguration. |
| * |
| * Returns NULL in case of error starting configuration. |
| */ |
| camera3_stream* startConfiguration(); |
| |
| /** |
| * Check if the stream is mid-configuration (start has been called, but not |
| * finish). Used for lazy completion of configuration. |
| */ |
| bool isConfiguring() const; |
| |
| /** |
| * Completes the stream configuration process. During this call, the stream |
| * may call the device's register_stream_buffers() method. The stream |
| * information structure returned by startConfiguration() may no longer be |
| * modified after this call, but can still be read until the destruction of |
| * the stream. |
| * |
| * Returns: |
| * OK on a successful configuration |
| * NO_INIT in case of a serious error from the HAL device |
| * NO_MEMORY in case of an error registering buffers |
| * INVALID_OPERATION in case connecting to the consumer failed or consumer |
| * doesn't exist yet. |
| */ |
| status_t finishConfiguration(camera3_device *hal3Device); |
| |
| /** |
| * Cancels the stream configuration process. This returns the stream to the |
| * initial state, allowing it to be configured again later. |
| * This is done if the HAL rejects the proposed combined stream configuration |
| */ |
| status_t cancelConfiguration(); |
| |
| /** |
| * Determine whether the stream has already become in-use (has received |
| * a valid filled buffer), which determines if a stream can still have |
| * prepareNextBuffer called on it. |
| */ |
| bool isUnpreparable(); |
| |
| /** |
| * Start stream preparation. May only be called in the CONFIGURED state, |
| * when no valid buffers have yet been returned to this stream. Prepares |
| * up to maxCount buffers, or the maximum number of buffers needed by the |
| * pipeline if maxCount is ALLOCATE_PIPELINE_MAX. |
| * |
| * If no prepartion is necessary, returns OK and does not transition to |
| * PREPARING state. Otherwise, returns NOT_ENOUGH_DATA and transitions |
| * to PREPARING. |
| * |
| * This call performs no allocation, so is quick to call. |
| * |
| * Returns: |
| * OK if no more buffers need to be preallocated |
| * NOT_ENOUGH_DATA if calls to prepareNextBuffer are needed to finish |
| * buffer pre-allocation, and transitions to the PREPARING state. |
| * NO_INIT in case of a serious error from the HAL device |
| * INVALID_OPERATION if called when not in CONFIGURED state, or a |
| * valid buffer has already been returned to this stream. |
| */ |
| status_t startPrepare(int maxCount); |
| |
| /** |
| * Check if the stream is mid-preparing. |
| */ |
| bool isPreparing() const; |
| |
| /** |
| * Continue stream buffer preparation by allocating the next |
| * buffer for this stream. May only be called in the PREPARED state. |
| * |
| * Returns OK and transitions to the CONFIGURED state if all buffers |
| * are allocated after the call concludes. Otherwise returns NOT_ENOUGH_DATA. |
| * |
| * This call allocates one buffer, which may take several milliseconds for |
| * large buffers. |
| * |
| * Returns: |
| * OK if no more buffers need to be preallocated, and transitions |
| * to the CONFIGURED state. |
| * NOT_ENOUGH_DATA if more calls to prepareNextBuffer are needed to finish |
| * buffer pre-allocation. |
| * NO_INIT in case of a serious error from the HAL device |
| * INVALID_OPERATION if called when not in CONFIGURED state, or a |
| * valid buffer has already been returned to this stream. |
| */ |
| status_t prepareNextBuffer(); |
| |
| /** |
| * Cancel stream preparation early. In case allocation needs to be |
| * stopped, this method transitions the stream back to the CONFIGURED state. |
| * Buffers that have been allocated with prepareNextBuffer remain that way, |
| * but a later use of prepareNextBuffer will require just as many |
| * calls as if the earlier prepare attempt had not existed. |
| * |
| * Returns: |
| * OK if cancellation succeeded, and transitions to the CONFIGURED state |
| * INVALID_OPERATION if not in the PREPARING state |
| * NO_INIT in case of a serious error from the HAL device |
| */ |
| status_t cancelPrepare(); |
| |
| /** |
| * Tear down memory for this stream. This frees all unused gralloc buffers |
| * allocated for this stream, but leaves it ready for operation afterward. |
| * |
| * May only be called in the CONFIGURED state, and keeps the stream in |
| * the CONFIGURED state. |
| * |
| * Returns: |
| * OK if teardown succeeded. |
| * INVALID_OPERATION if not in the CONFIGURED state |
| * NO_INIT in case of a serious error from the HAL device |
| */ |
| status_t tearDown(); |
| |
| /** |
| * Fill in the camera3_stream_buffer with the next valid buffer for this |
| * stream, to hand over to the HAL. |
| * |
| * This method may only be called once finishConfiguration has been called. |
| * For bidirectional streams, this method applies to the output-side |
| * buffers. |
| * |
| */ |
| status_t getBuffer(camera3_stream_buffer *buffer); |
| |
| /** |
| * Return a buffer to the stream after use by the HAL. |
| * |
| * This method may only be called for buffers provided by getBuffer(). |
| * For bidirectional streams, this method applies to the output-side buffers |
| */ |
| status_t returnBuffer(const camera3_stream_buffer &buffer, |
| nsecs_t timestamp); |
| |
| /** |
| * Fill in the camera3_stream_buffer with the next valid buffer for this |
| * stream, to hand over to the HAL. |
| * |
| * This method may only be called once finishConfiguration has been called. |
| * For bidirectional streams, this method applies to the input-side |
| * buffers. |
| * |
| */ |
| status_t getInputBuffer(camera3_stream_buffer *buffer); |
| |
| /** |
| * Return a buffer to the stream after use by the HAL. |
| * |
| * This method may only be called for buffers provided by getBuffer(). |
| * For bidirectional streams, this method applies to the input-side buffers |
| */ |
| status_t returnInputBuffer(const camera3_stream_buffer &buffer); |
| |
| // get the buffer producer of the input buffer queue. |
| // only apply to input streams. |
| status_t getInputBufferProducer(sp<IGraphicBufferProducer> *producer); |
| |
| /** |
| * Whether any of the stream's buffers are currently in use by the HAL, |
| * including buffers that have been returned but not yet had their |
| * release fence signaled. |
| */ |
| bool hasOutstandingBuffers() const; |
| |
| enum { |
| TIMEOUT_NEVER = -1 |
| }; |
| |
| /** |
| * Set the status tracker to notify about idle transitions |
| */ |
| virtual status_t setStatusTracker(sp<StatusTracker> statusTracker); |
| |
| /** |
| * Disconnect stream from its non-HAL endpoint. After this, |
| * start/finishConfiguration must be called before the stream can be used |
| * again. This cannot be called if the stream has outstanding dequeued |
| * buffers. |
| */ |
| status_t disconnect(); |
| |
| /** |
| * Debug dump of the stream's state. |
| */ |
| virtual void dump(int fd, const Vector<String16> &args) const = 0; |
| |
| /** |
| * Add a camera3 buffer listener. Adding the same listener twice has |
| * no effect. |
| */ |
| void addBufferListener( |
| wp<Camera3StreamBufferListener> listener); |
| |
| /** |
| * Remove a camera3 buffer listener. Removing the same listener twice |
| * or the listener that was never added has no effect. |
| */ |
| void removeBufferListener( |
| const sp<Camera3StreamBufferListener>& listener); |
| |
| /** |
| * Return if the buffer queue of the stream is abandoned. |
| */ |
| bool isAbandoned() const; |
| |
| protected: |
| const int mId; |
| /** |
| * Stream set id, used to indicate which group of this stream belongs to for buffer sharing |
| * across multiple streams. |
| * |
| * The default value is set to CAMERA3_STREAM_SET_ID_INVALID, which indicates that this stream |
| * doesn't intend to share buffers with any other streams, and this stream will fall back to |
| * the existing BufferQueue mechanism to manage the buffer allocations and buffer circulation. |
| * When a valid stream set id is set, this stream intends to use the Camera3BufferManager to |
| * manage the buffer allocations; the BufferQueue will only handle the buffer transaction |
| * between the producer and consumer. For this case, upon successfully registration, the streams |
| * with the same stream set id will potentially share the buffers allocated by |
| * Camera3BufferManager. |
| */ |
| const int mSetId; |
| |
| const String8 mName; |
| // Zero for formats with fixed buffer size for given dimensions. |
| const size_t mMaxSize; |
| |
| enum { |
| STATE_ERROR, |
| STATE_CONSTRUCTED, |
| STATE_IN_CONFIG, |
| STATE_IN_RECONFIG, |
| STATE_CONFIGURED, |
| STATE_PREPARING, |
| STATE_ABANDONED |
| } mState; |
| |
| mutable Mutex mLock; |
| |
| Camera3Stream(int id, camera3_stream_type type, |
| uint32_t width, uint32_t height, size_t maxSize, int format, |
| android_dataspace dataSpace, camera3_stream_rotation_t rotation, |
| int setId); |
| |
| /** |
| * Interface to be implemented by derived classes |
| */ |
| |
| // getBuffer / returnBuffer implementations |
| |
| // Since camera3_stream_buffer includes a raw pointer to the stream, |
| // cast to camera3_stream*, implementations must increment the |
| // refcount of the stream manually in getBufferLocked, and decrement it in |
| // returnBufferLocked. |
| virtual status_t getBufferLocked(camera3_stream_buffer *buffer); |
| virtual status_t returnBufferLocked(const camera3_stream_buffer &buffer, |
| nsecs_t timestamp); |
| virtual status_t getInputBufferLocked(camera3_stream_buffer *buffer); |
| virtual status_t returnInputBufferLocked( |
| const camera3_stream_buffer &buffer); |
| virtual bool hasOutstandingBuffersLocked() const = 0; |
| // Get the buffer producer of the input buffer queue. Only apply to input streams. |
| virtual status_t getInputBufferProducerLocked(sp<IGraphicBufferProducer> *producer); |
| |
| // Can return -ENOTCONN when we are already disconnected (not an error) |
| virtual status_t disconnectLocked() = 0; |
| |
| // Configure the buffer queue interface to the other end of the stream, |
| // after the HAL has provided usage and max_buffers values. After this call, |
| // the stream must be ready to produce all buffers for registration with |
| // HAL. |
| virtual status_t configureQueueLocked() = 0; |
| |
| // Get the total number of buffers in the queue |
| virtual size_t getBufferCountLocked() = 0; |
| |
| // Get handout output buffer count. |
| virtual size_t getHandoutOutputBufferCountLocked() = 0; |
| |
| // Get handout input buffer count. |
| virtual size_t getHandoutInputBufferCountLocked() = 0; |
| |
| // Get the usage flags for the other endpoint, or return |
| // INVALID_OPERATION if they cannot be obtained. |
| virtual status_t getEndpointUsage(uint32_t *usage) const = 0; |
| |
| // Tracking for idle state |
| wp<StatusTracker> mStatusTracker; |
| // Status tracker component ID |
| int mStatusId; |
| |
| // Tracking for stream prepare - whether this stream can still have |
| // prepareNextBuffer called on it. |
| bool mStreamUnpreparable; |
| |
| private: |
| uint32_t mOldUsage; |
| uint32_t mOldMaxBuffers; |
| Condition mOutputBufferReturnedSignal; |
| Condition mInputBufferReturnedSignal; |
| static const nsecs_t kWaitForBufferDuration = 3000000000LL; // 3000 ms |
| |
| // Gets all buffers from endpoint and registers them with the HAL. |
| status_t registerBuffersLocked(camera3_device *hal3Device); |
| |
| void fireBufferListenersLocked(const camera3_stream_buffer& buffer, |
| bool acquired, bool output); |
| List<wp<Camera3StreamBufferListener> > mBufferListenerList; |
| |
| status_t cancelPrepareLocked(); |
| |
| // Return whether the buffer is in the list of outstanding buffers. |
| bool isOutstandingBuffer(const camera3_stream_buffer& buffer); |
| |
| // Remove the buffer from the list of outstanding buffers. |
| void removeOutstandingBuffer(const camera3_stream_buffer& buffer); |
| |
| // Tracking for PREPARING state |
| |
| // State of buffer preallocation. Only true if either prepareNextBuffer |
| // has been called sufficient number of times, or stream configuration |
| // had to register buffers with the HAL |
| bool mPrepared; |
| |
| Vector<camera3_stream_buffer_t> mPreparedBuffers; |
| size_t mPreparedBufferIdx; |
| |
| // Number of buffers allocated on last prepare call. |
| size_t mLastMaxCount; |
| |
| // Outstanding buffers dequeued from the stream's buffer queue. |
| List<buffer_handle_t> mOutstandingBuffers; |
| |
| }; // class Camera3Stream |
| |
| }; // namespace camera3 |
| |
| }; // namespace android |
| |
| #endif |
