/* * 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_INTERFACE_H #define ANDROID_SERVERS_CAMERA3_STREAM_INTERFACE_H #include #include "Camera3StreamBufferListener.h" struct camera3_stream_buffer; namespace android { namespace camera3 { class StatusTracker; /** * An interface for managing a single stream of input and/or output data from * the camera device. */ class Camera3StreamInterface : public virtual RefBase { public: enum { ALLOCATE_PIPELINE_MAX = 0, // Allocate max buffers used by a given surface }; /** * Get the stream's ID */ virtual int getId() const = 0; /** * Get the stream's dimensions and format */ virtual uint32_t getWidth() const = 0; virtual uint32_t getHeight() const = 0; virtual int getFormat() const = 0; virtual android_dataspace getDataSpace() const = 0; /** * 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. */ virtual camera3_stream* startConfiguration() = 0; /** * Check if the stream is mid-configuration (start has been called, but not * finish). Used for lazy completion of configuration. */ virtual bool isConfiguring() const = 0; /** * 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 */ virtual status_t finishConfiguration(camera3_device *hal3Device) = 0; /** * 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 */ virtual status_t cancelConfiguration() = 0; /** * 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. */ virtual bool isUnpreparable() = 0; /** * 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. * * 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. */ virtual status_t startPrepare(int maxCount) = 0; /** * Check if the stream is mid-preparing. */ virtual bool isPreparing() const = 0; /** * 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. * * 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. */ virtual status_t prepareNextBuffer() = 0; /** * 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 */ virtual status_t cancelPrepare() = 0; /** * 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 */ virtual status_t tearDown() = 0; /** * 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. * */ virtual status_t getBuffer(camera3_stream_buffer *buffer) = 0; /** * 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 */ virtual status_t returnBuffer(const camera3_stream_buffer &buffer, nsecs_t timestamp) = 0; /** * 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. * */ virtual status_t getInputBuffer(camera3_stream_buffer *buffer) = 0; /** * 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 */ virtual status_t returnInputBuffer(const camera3_stream_buffer &buffer) = 0; /** * Get the buffer producer of the input buffer queue. * * This method only applies to input streams. */ virtual status_t getInputBufferProducer(sp *producer) = 0; /** * 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. */ virtual bool hasOutstandingBuffers() const = 0; enum { TIMEOUT_NEVER = -1 }; /** * Set the state tracker to use for signaling idle transitions. */ virtual status_t setStatusTracker(sp statusTracker) = 0; /** * 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. */ virtual status_t disconnect() = 0; /** * Debug dump of the stream's state. */ virtual void dump(int fd, const Vector &args) const = 0; virtual void addBufferListener( wp listener) = 0; virtual void removeBufferListener( const sp& listener) = 0; }; } // namespace camera3 } // namespace android #endif