platform_hardware_interfaces/media/omx/1.0/IOmxStore.hal

/*
 * Copyright (C) 2017 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.media.omx@1.0;

import IOmx;

/**
 * Ref: frameworks/av/include/media/IOMX.h: IOMX
 *
 * There will be two instances of IOmxStore: "platform" and "vendor".
 *
 * The IOmxStore service provided by the platform must present "platform" as the
 * interface name.
 *
 * The IOmxStore service provided by the vendor must present "vendor" as the
 * instance name.
 */
interface IOmxStore {

    /**
     * Attribute is a key-value pair of strings. The `value` member is generally
     * a stringified value of the following:
     *   enum<v1,v2,...,vn>:    v1 | v2 | ... | vn
     *   num:                   0 | [1-9][0-9]*
     *   string:                arbitrary string
     *   size:                  <num>x<num>
     *   ratio:                 <num>:<num>
     *   range<type>:           <type> | <type>-<type>
     *   list<type>:            <type> | <type>,<list<type>>
     */
    struct Attribute {
        string key;
        string value;
    };

    /**
     * Service attribute
     *
     * Optional service attributes:
     *   key: 'max-video-encoder-input-buffers', value-type: num
     *   key: 'supports-multiple-secure-codecs', value-type: enum<0,1>
     *   key: 'supports-secure-with-non-secure-codec', value-type: enum<0,1>
     *
     * For keys with prefix 'supports-', the value of 0 means "no" (not
     * supported) while the value of 1 means "yes" (supported).
     */
    typedef Attribute ServiceAttribute;

    /**
     * List attributes that are service-specific (not node-specific).
     *
     * @return attributes The list of `Attribute`s that are specific to this
     *                    service.
     */
    listServiceAttributes(
        ) generates (
            Status status,
            vec<ServiceAttribute> attributes
        );

    /**
     * Node attribute
     *
     * Optional node attributes to describe supported values:
     *   key: 'bitrate-range', value-type: range<num>
     *   key: 'max-concurrent-instances', value-type: num
     *   key: 'max-supported-instances', value-type: num
     *
     * Optional node attributes for audio nodes to describe supported values:
     *   key: 'max-channel-count', value-type: num
     *   key: 'sample-rate-ranges', value-type: list<range<num>>
     *
     * Optional node attributes for video nodes to describe supported values:
     *   key: 'alignment', value-type: size
     *   key: 'block-aspect-ratio-range', value-type: range<ratio>
     *   key: 'block-count-range', value-type: range<num>
     *   key: 'block-size', value-type: size
     *   key: 'blocks-per-second-range', value-type: range<num>
     *   key: 'feature-can-swap-width-height', value-type: enum<0,1>
     *   key: 'frame-rate-range', value-type: range<num>
     *   key: 'pixel-aspect-ratio-range', value-type: range<ratio>
     *   key: 'size-range', value-type: range<size>
     *
     * Required node attributes for video nodes that are required by Android to
     * describe measured values for this device:
     *   key: 'measured-frame-rate-<width>x<height>-range',
     *     value-type: range<num>; where width: num, height: num
     *
     * Optional node attributes for decoders to describe supported values:
     *   key: 'feature-adaptive-playback', value: enum<0,1>
     *   key: 'feature-secure-playback', value: enum<0,1>
     *   key: 'feature-tunneled-playback', value: enum<0,1>
     *
     * Optional node attributes for video decoders to describe supported values:
     *   key: 'feature-partial-frame', value: enum<0,1>
     *
     * Optional node attributes for encoders to describe supported values:
     *   key: 'complexity-default', value-type: num
     *   key: 'complexity-range', value-type: range<num>
     *   key: 'feature-bitrate-modes', value-type: list<enum<VBR,CBR,CQ>>
     *   key: 'feature-intra-refresh', value-type: enum<0,1>
     *   key: 'quality-default', value-type: num
     *   key: 'quality-range', value-type: range<num>
     *   key: 'quality-scale', value-type: string
     *
     * For keys with prefix 'feature-' and value type enum<0,1>, the value of 0
     * means "optional", while the value of 1 means "required".
     */
    typedef Attribute NodeAttribute;

    /**
     * Information for an IOmxNode node.
     */
    struct NodeInfo {
        /**
         * Name of this node.
         *
         * `name` can be supplied to `IOmx::allocateNode` of a
         * corresponding `IOmx` instance to create the node.
         */
        string name;
        /**
         * Name of the `IOmx` instance that can create this node.
         *
         * To obtain the `IOmx` instance, call `getOmx(owner)`.
         */
        string owner;
        /**
         * List of node attributes.
         */
        vec<NodeAttribute> attributes;
    };

    /**
     * Information about nodes provided for a supported node role
     */
    struct RoleInfo {
        /**
         * Standard OMX node role.
         */
        string role;
        /**
         * Corresponding media type (as defined in MediaFormat.MIMETYPE_*
         * constants for types required by Android).
         */
        string type;
        /**
         * Whether this role is for an encoder or a decoder.
         */
        bool isEncoder;
        /**
         * Whether to prefer platform nodes for this role.
         */
        bool preferPlatformNodes;
        /**
         * List of nodes that support this role, ordered by preference.
         */
        vec<NodeInfo> nodes;
    };

    /**
     * Return the prefix of names of supported nodes.
     *
     * @return prefix The prefix of the names of all nodes supported by this
     *                service.
     */
    getNodePrefix(
        ) generates (
            string prefix
        );

    /**
     * List roles of supported nodes.
     *
     * The name of each node inside `NodeInfo` must start with the prefix
     * returned by `getNodePrefix()`.
     *
     * @return roleList The list of `RoleInfo`s.
     *
     * @see RoleInfo
     */
    listRoles(
        ) generates (
            vec<RoleInfo> roleList
        );

    /**
     * Obtain an `IOmx` instance with a specified name.
     *
     * @param name The name of the instance.
     * @return omx The `IOmx` interface associated with `name`. This must be
     * null if the name is not found.
     */
    getOmx(
            string name
        ) generates (
            IOmx omx
        );

};