camera/device/3.4/ICameraDeviceSession.hal

/*
 * Copyright (C) 2017-2018 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.
 */

package android.hardware.camera.device@3.4;

import android.hardware.camera.common@1.0::Status;
import @3.2::CameraMetadata;
import @3.3::ICameraDeviceSession;
import @3.3::HalStreamConfiguration;
import @3.2::BufferCache;

/**
 * Camera device active session interface.
 *
 * Obtained via ICameraDevice::open(), this interface contains the methods to
 * configure and request captures from an active camera device.
 */
interface ICameraDeviceSession extends @3.3::ICameraDeviceSession {

    /**
     * constructDefaultRequestSettings_3_4:
     *
     * Create capture settings for standard camera use cases. Supports the
     * new template enums added in @3.4.
     *
     * The device must return a settings buffer that is configured to meet the
     * requested use case, which must be one of the CAMERA3_TEMPLATE_*
     * enums. All request control fields must be included.
     *
     * Performance requirements:
     *
     * This must be a non-blocking call. The HAL should return from this call
     * in 1ms, and must return from this call in 5ms.
     *
     * Return values:
     * @return status Status code for the operation, one of:
     *     OK:
     *         On a successful construction of default settings.
     *     INTERNAL_ERROR:
     *         An unexpected internal error occurred, and the default settings
     *         are not available.
     *     ILLEGAL_ARGUMENT:
     *         The camera HAL does not support the input template type
     *     CAMERA_DISCONNECTED:
     *         An external camera device has been disconnected, and is no longer
     *         available. This camera device interface is now stale, and a new
     *         instance must be acquired if the device is reconnected. All
     *         subsequent calls on this interface must return
     *         CAMERA_DISCONNECTED.
     * @return requestTemplate The default capture request settings for the requested
     *     use case, or an empty metadata structure if status is not OK.
     *
     */
    constructDefaultRequestSettings_3_4(RequestTemplate type) generates
            (Status status, @3.2::CameraMetadata requestTemplate);

    /**
     * configureStreams_3_4:
     *
     * Identical to @3.3::ICameraDeviceSession.configureStreams, except that:
     *
     * - The requested configuration includes session parameters.
     *
     * @return Status Status code for the operation, one of:
     *     OK:
     *          On successful stream configuration.
     *     INTERNAL_ERROR:
     *         If there has been a fatal error and the device is no longer
     *         operational. Only close() can be called successfully by the
     *         framework after this error is returned.
     *     ILLEGAL_ARGUMENT:
     *         If the requested stream configuration is invalid. Some examples
     *         of invalid stream configurations include:
     *           - Including more than 1 INPUT stream
     *           - Not including any OUTPUT streams
     *           - Including streams with unsupported formats, or an unsupported
     *             size for that format.
     *           - Including too many output streams of a certain format.
     *           - Unsupported rotation configuration
     *           - Stream sizes/formats don't satisfy the
     *             camera3_stream_configuration_t->operation_mode requirements
     *             for non-NORMAL mode, or the requested operation_mode is not
     *             supported by the HAL.
     *           - Unsupported usage flag
     *         The camera service cannot filter out all possible illegal stream
     *         configurations, since some devices may support more simultaneous
     *         streams or larger stream resolutions than the minimum required
     *         for a given camera device hardware level. The HAL must return an
     *         ILLEGAL_ARGUMENT for any unsupported stream set, and then be
     *         ready to accept a future valid stream configuration in a later
     *         configureStreams call.
     * @return halConfiguration The stream parameters desired by the HAL for
     *     each stream, including maximum buffers, the usage flags, and the
     *     override format.
     */
    configureStreams_3_4(@3.4::StreamConfiguration requestedConfiguration)
            generates (Status status,
                       @3.4::HalStreamConfiguration halConfiguration);

    /**
     * processCaptureRequest_3_4:
     *
     * Identical to @3.2::ICameraDeviceSession.processCaptureRequest, except that:
     *
     * - The capture request can include individual settings for physical camera devices
     *   backing a logical multi-camera.
     *
     * @return status Status code for the operation, one of:
     *     OK:
     *         On a successful start to processing the capture request
     *     ILLEGAL_ARGUMENT:
     *         If the input is malformed (the settings are empty when not
     *         allowed, the physical camera settings are invalid, there are 0
     *         output buffers, etc) and capture processing
     *         cannot start. Failures during request processing must be
     *         handled by calling ICameraDeviceCallback::notify(). In case of
     *         this error, the framework retains responsibility for the
     *         stream buffers' fences and the buffer handles; the HAL must not
     *         close the fences or return these buffers with
     *         ICameraDeviceCallback::processCaptureResult().
     *     INTERNAL_ERROR:
     *         If the camera device has encountered a serious error. After this
     *         error is returned, only the close() method can be successfully
     *         called by the framework.
     * @return numRequestProcessed Number of requests successfully processed by
     *     camera HAL. When status is OK, this must be equal to the size of
     *     requests. When the call fails, this number is the number of requests
     *     that HAL processed successfully before HAL runs into an error.
     *
     */
    processCaptureRequest_3_4(vec<CaptureRequest> requests, vec<BufferCache> cachesToRemove)
            generates (Status status, uint32_t numRequestProcessed);
};