/* * 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 #include #include #include #include #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: * * => STATE_CONSTRUCTED: * When constructed with valid arguments * => 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. * * 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 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 */ 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 *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); /** * 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 &args) const = 0; /** * Add a camera3 buffer listener. Adding the same listener twice has * no effect. */ void addBufferListener( wp 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& listener); protected: const int mId; 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 } 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); /** * 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 *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 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 oldUsage; uint32_t oldMaxBuffers; 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 > mBufferListenerList; status_t cancelPrepareLocked(); // 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 mPreparedBuffers; size_t mPreparedBufferIdx; // Number of buffers allocated on last prepare call. int mLastMaxCount; }; // class Camera3Stream }; // namespace camera3 }; // namespace android #endif