203 lines
9.0 KiB
XML
203 lines
9.0 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<protocol name="wlr_export_dmabuf_unstable_v1">
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<copyright>
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Copyright © 2018 Rostislav Pehlivanov
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice (including the next
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paragraph) shall be included in all copies or substantial portions of the
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Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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</copyright>
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<description summary="a protocol for low overhead screen content capturing">
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An interface to capture surfaces in an efficient way by exporting DMA-BUFs.
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Warning! The protocol described in this file is experimental and
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backward incompatible changes may be made. Backward compatible changes
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may be added together with the corresponding interface version bump.
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Backward incompatible changes are done by bumping the version number in
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the protocol and interface names and resetting the interface version.
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Once the protocol is to be declared stable, the 'z' prefix and the
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version number in the protocol and interface names are removed and the
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interface version number is reset.
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</description>
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<interface name="zwlr_export_dmabuf_manager_v1" version="1">
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<description summary="manager to inform clients and begin capturing">
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This object is a manager with which to start capturing from sources.
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</description>
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<request name="capture_output">
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<description summary="capture a frame from an output">
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Capture the next frame of a an entire output.
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</description>
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<arg name="frame" type="new_id" interface="zwlr_export_dmabuf_frame_v1"/>
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<arg name="overlay_cursor" type="int"
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summary="include custom client hardware cursor on top of the frame"/>
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<arg name="output" type="object" interface="wl_output"/>
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</request>
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<request name="destroy" type="destructor">
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<description summary="destroy the manager">
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All objects created by the manager will still remain valid, until their
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appropriate destroy request has been called.
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</description>
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</request>
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</interface>
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<interface name="zwlr_export_dmabuf_frame_v1" version="1">
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<description summary="a DMA-BUF frame">
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This object represents a single DMA-BUF frame.
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If the capture is successful, the compositor will first send a "frame"
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event, followed by one or several "object". When the frame is available
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for readout, the "ready" event is sent.
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If the capture failed, the "cancel" event is sent. This can happen anytime
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before the "ready" event.
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Once either a "ready" or a "cancel" event is received, the client should
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destroy the frame. Once an "object" event is received, the client is
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responsible for closing the associated file descriptor.
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All frames are read-only and may not be written into or altered.
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</description>
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<enum name="flags">
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<description summary="frame flags">
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Special flags that should be respected by the client.
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</description>
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<entry name="transient" value="0x1"
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summary="clients should copy frame before processing"/>
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</enum>
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<event name="frame">
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<description summary="a frame description">
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Main event supplying the client with information about the frame. If the
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capture didn't fail, this event is always emitted first before any other
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events.
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This event is followed by a number of "object" as specified by the
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"num_objects" argument.
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</description>
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<arg name="width" type="uint"
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summary="frame width in pixels"/>
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<arg name="height" type="uint"
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summary="frame height in pixels"/>
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<arg name="offset_x" type="uint"
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summary="crop offset for the x axis"/>
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<arg name="offset_y" type="uint"
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summary="crop offset for the y axis"/>
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<arg name="buffer_flags" type="uint"
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summary="flags which indicate properties (invert, interlacing),
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has the same values as zwp_linux_buffer_params_v1:flags"/>
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<arg name="flags" type="uint" enum="flags"
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summary="indicates special frame features"/>
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<arg name="format" type="uint"
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summary="format of the frame (DRM_FORMAT_*)"/>
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<arg name="mod_high" type="uint"
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summary="drm format modifier, high"/>
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<arg name="mod_low" type="uint"
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summary="drm format modifier, low"/>
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<arg name="num_objects" type="uint"
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summary="indicates how many objects (FDs) the frame has (max 4)"/>
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</event>
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<event name="object">
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<description summary="an object description">
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Event which serves to supply the client with the file descriptors
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containing the data for each object.
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After receiving this event, the client must always close the file
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descriptor as soon as they're done with it and even if the frame fails.
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</description>
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<arg name="index" type="uint"
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summary="index of the current object"/>
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<arg name="fd" type="fd"
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summary="fd of the current object"/>
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<arg name="size" type="uint"
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summary="size in bytes for the current object"/>
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<arg name="offset" type="uint"
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summary="starting point for the data in the object's fd"/>
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<arg name="stride" type="uint"
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summary="line size in bytes"/>
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<arg name="plane_index" type="uint"
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summary="index of the the plane the data in the object applies to"/>
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</event>
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<event name="ready">
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<description summary="indicates frame is available for reading">
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This event is sent as soon as the frame is presented, indicating it is
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available for reading. This event includes the time at which
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presentation happened at.
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The timestamp is expressed as tv_sec_hi, tv_sec_lo, tv_nsec triples,
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each component being an unsigned 32-bit value. Whole seconds are in
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tv_sec which is a 64-bit value combined from tv_sec_hi and tv_sec_lo,
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and the additional fractional part in tv_nsec as nanoseconds. Hence,
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for valid timestamps tv_nsec must be in [0, 999999999]. The seconds part
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may have an arbitrary offset at start.
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After receiving this event, the client should destroy this object.
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</description>
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<arg name="tv_sec_hi" type="uint"
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summary="high 32 bits of the seconds part of the timestamp"/>
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<arg name="tv_sec_lo" type="uint"
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summary="low 32 bits of the seconds part of the timestamp"/>
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<arg name="tv_nsec" type="uint"
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summary="nanoseconds part of the timestamp"/>
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</event>
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<enum name="cancel_reason">
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<description summary="cancel reason">
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Indicates reason for cancelling the frame.
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</description>
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<entry name="temporary" value="0"
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summary="temporary error, source will produce more frames"/>
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<entry name="permanent" value="1"
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summary="fatal error, source will not produce frames"/>
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<entry name="resizing" value="2"
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summary="temporary error, source will produce more frames"/>
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</enum>
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<event name="cancel">
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<description summary="indicates the frame is no longer valid">
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If the capture failed or if the frame is no longer valid after the
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"frame" event has been emitted, this event will be used to inform the
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client to scrap the frame.
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If the failure is temporary, the client may capture again the same
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source. If the failure is permanent, any further attempts to capture the
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same source will fail again.
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After receiving this event, the client should destroy this object.
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</description>
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<arg name="reason" type="uint" enum="cancel_reason"
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summary="indicates a reason for cancelling this frame capture"/>
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</event>
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<request name="destroy" type="destructor">
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<description summary="delete this object, used or not">
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Unreferences the frame. This request must be called as soon as its no
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longer used.
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It can be called at any time by the client. The client will still have
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to close any FDs it has been given.
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</description>
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</request>
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</interface>
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</protocol>
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