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export-dmabuf: add basic and incomplete implementation

This commit is contained in:
emersion 2018-05-22 17:38:05 +01:00
parent 9e26808c28
commit 36bd4795d4
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5 changed files with 451 additions and 1 deletions
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33
include/wlr/types/wlr_export_dmabuf_v1.h Normal file
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@ -0,0 +1,33 @@
#ifndef WLR_TYPES_WLR_EXPORT_DMABUF_V1_H
#define WLR_TYPES_WLR_EXPORT_DMABUF_V1_H
#include <wayland-server.h>
struct wlr_export_dmabuf_manager_v1;
struct wlr_export_dmabuf_frame_v1 {
struct wl_resource *resource;
struct wlr_export_dmabuf_manager_v1 *manager;
struct wl_list link;
struct wlr_output *output;
};
struct wlr_export_dmabuf_manager_v1 {
struct wl_global *global;
struct wl_list resources;
struct wl_list frames;
struct wl_listener display_destroy;
struct {
struct wl_signal destroy;
} events;
};
struct wlr_export_dmabuf_manager_v1 *wlr_export_dmabuf_manager_v1_create(
struct wl_display *display);
void wlr_export_dmabuf_manager_v1_destroy(
struct wlr_export_dmabuf_manager_v1 *manager);
#endif

3
protocol/meson.build
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@ -39,8 +39,9 @@ protocols = [
'screenshooter.xml',
'server-decoration.xml',
'virtual-keyboard-unstable-v1.xml',
'wlr-layer-shell-unstable-v1.xml',
'wlr-export-dmabuf-unstable-v1.xml',
'wlr-input-inhibitor-unstable-v1.xml',
'wlr-layer-shell-unstable-v1.xml',
]
client_protocols = [

230
protocol/wlr-export-dmabuf-unstable-v1.xml Normal file
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@ -0,0 +1,230 @@
<?xml version="1.0" encoding="UTF-8"?>
<protocol name="wlr_export_dmabuf_unstable_v1">
<copyright>
Copyright © 2018 Rostislav Pehlivanov
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice (including the next
paragraph) shall be included in all copies or substantial portions of the
Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
</copyright>
<description summary="a frame ready for readout">
An interface to capture surfaces in an efficient way.
Overall usage:
1.) client registers with zwlr_screencontent_manager_v1
2.) server sends client info about surfaces via "receive_surface_info"
3.) client subscribes to capture a surface via the "capture" requests
4.) server sends client events via the "zwlr_screencontent_frame" interface
5.) client finishes and informs server via the "frame_destroy" event
6.) client optionally resubscribes via repeating steps 3.) through 5.)
</description>
<interface name="zwlr_export_dmabuf_frame_v1" version="1">
<description summary="a frame ready for readout">
This object represents a frame which is ready to have its resources
fetched and used.
The receive callback shall be called first, followed by either the
"dma_object" callback once per object or the "dma_layer" callback,
once per layer. The "dma_plane" callback shall only be called after
the "dma_layer" callback corresponding to the layer the plane belongs
to has been called. Finally, the "ready" event is called to indicate that
all the data has been made available for readout, as well as the time
at which presentation happened at.
The ownership of the frame is passed to the client, who's responsible for
destroying it via the "destroy" event once finished.
The data the API describes has been based off of what
VASurfaceAttribExternalBuffers contains.
All frames are read-only and may not be written into or altered.
</description>
<enum name="frame_flags">
<description summary="frame flags">
Special flags that must be respected by the client.
Transient frames indicate short lifetime frames (such as swapchain
images from external clients). Clients are advised to copy them and do
all processing outside of the "ready" event.
</description>
<entry name="transient" value="1" since="1"/>
</enum>
<event name="frame">
<description summary="main callback">
Main callback supplying the client with information about the frame,
as well as an object to serve as context for destruction. Always called
first before any other events.
The "transform" argument describes the orientation needed to be applied
to correctly orient the buffer. For example, a buffer rotated by 90
degrees will have a value of "3" here, corresponding to the need to
apply a 270 degree transpose to correctly present the buffer.
</description>
<arg name="width" type="uint"
summary="frame width, scaling factor included"/>
<arg name="height" type="uint"
summary="frame height, scaling factor included"/>
<arg name="scale" type="uint"
summary="current scaling factor of the client"/>
<arg name="transform" type="uint"
summary="transform needed to correct the orientation, has the same
values as wl_output::transform"/>
<arg name="flags" type="uint"
summary="flags which indicate properties (invert, interlacing),
has the same values as zwp_linux_buffer_params_v1:flags"/>
<arg name="frame_flags" type="uint" enum="frame_flags"
summary="indicates special frame features"/>
<arg name="mod_high" type="uint"
summary="drm format modifier, high"/>
<arg name="mod_low" type="uint"
summary="drm format modifier, low"/>
<arg name="num_objects" type="uint"
summary="indicates how many objects (FDs) the frame has (max 4)"/>
<arg name="num_layers" type="uint"
summary="indicates how many layers the frame has (max 4)"/>
</event>
<event name="dma_object">
<description summary="object receiving callback">
Callback which serves to supply the client with the file descriptors
containing the data for each object.
</description>
<arg name="index" type="uint"
summary="index of the current object"/>
<arg name="fd" type="fd"
summary="fd of the current object"/>
<arg name="size" type="uint"
summary="size in bytes for the current object"/>
</event>
<event name="dma_layer">
<description summary="layer receiving callback">
Callback which serves to supply the client with information on what's
contained in each file descriptor and how its laid out.
Will be called after the main receive event, once per layer.
</description>
<arg name="index" type="uint"
summary="index of the current plane"/>
<arg name="format" type="uint"
summary="format of the layer (DRM_FORMAT_*)"/>
<arg name="num_planes" type="uint"
summary="number of planes in the current layer (max 4)"/>
</event>
<event name="dma_plane">
<description summary="plane info receiving callback">
Callback which supplies the client with plane information for each
layer.
</description>
<arg name="index" type="uint"
summary="index of the current plane"/>
<arg name="layer_index" type="uint"
summary="index of the current layer"/>
<arg name="object_index" type="uint"
summary="index of the object the plane applies to"/>
<arg name="offset" type="uint"
summary="starting point for the data in the object's fd"/>
<arg name="stride" type="uint"
summary="line size in bytes"/>
</event>
<event name="ready">
<description summary="indicates frame is available for reading">
Called as soon as the frame is presented, indicating it is available
for reading.
The timestamp is expressed as tv_sec_hi, tv_sec_lo, tv_nsec triples,
each component being an unsigned 32-bit value. Whole seconds are in
tv_sec which is a 64-bit value combined from tv_sec_hi and tv_sec_lo,
and the additional fractional part in tv_nsec as nanoseconds. Hence,
for valid timestamps tv_nsec must be in [0, 999999999].
The seconds part may have an arbitrary offset at start.
</description>
<arg name="tv_sec_hi" type="uint"
summary="high 32 bits of the seconds part of the timestamp"/>
<arg name="tv_sec_lo" type="uint"
summary="low 32 bits of the seconds part of the timestamp"/>
<arg name="tv_nsec" type="uint"
summary="nanoseconds part of the timestamp"/>
</event>
<event name="abort">
<description summary="indicates the frame is no longer valid">
If the frame is no longer valid after the "frame" event has been called,
this callback will be used to inform the client to scrap the frame.
Source is still valid for as long as the subscription function does not
return NULL.
This may get called if for instance the surface is in the process of
resizing.
</description>
</event>
<request name="destroy" type="destructor">
<description summary="delete this object, used or not">
Unreferences the frame, allowing it to be reused. Must be called as soon
as its no longer used.
</description>
</request>
</interface>
<interface name="zwlr_export_dmabuf_manager_v1" version="1">
<description summary="manager to inform clients and begin capturing">
This object is a manager which informs clients about capturable windows
and is able to create callbacks from which to begin to receive content
from. The "title" argument in the "surface_info" event shall be used
to provide a user-readable identifier such as a window title or
program name.
</description>
<event name="surface_info">
<description summary="get valid surfaces for capture">
This will be called whenever a surface that's able to be captured
appears.
</description>
<arg name="title" type="string"
summary="window title or an identifier"/>
<arg name="id" type="uint"
summary="an identifier to create a context with"/>
</event>
<event name="surface_unavailable">
<description summary="notifies of a surface being unavailable to capture">
Called if a surface becomes unavailable to capture, for example if has
been closed.
</description>
<arg name="id" type="uint"
summary="an identifier of the surface"/>
</event>
<request name="capture_client">
<description summary="subscribe to start capturing">
Request to start capturing from a surface with a given id.
If an ID becomes unavailable, a NULL will be returned.
</description>
<arg name="frame" type="new_id"
interface="zwlr_export_dmabuf_frame_v1"/>
<arg name="id" type="uint"
summary="an identifier to start capturing from"/>
<arg name="overlay_cursor" type="int"
summary="overlay custom client hardware cursor on top of the frame"/>
</request>
<request name="capture_output">
<description summary="subscribe to start capturing">
Request to start capturing from an entire wl_output.
If an output becomes unavailable, a NULL will be returned.
</description>
<arg name="frame" type="new_id"
interface="zwlr_export_dmabuf_frame_v1"/>
<arg name="out" type="object" interface="wl_output" allow-null="false"/>
</request>
</interface>
</protocol>

1
types/meson.build
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@ -22,6 +22,7 @@ lib_wlr_types = static_library(
'wlr_box.c',
'wlr_compositor.c',
'wlr_cursor.c',
'wlr_export_dmabuf_v1.c',
'wlr_gamma_control.c',
'wlr_idle_inhibit_v1.c',
'wlr_idle.c',

185
types/wlr_export_dmabuf_v1.c Normal file
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@ -0,0 +1,185 @@
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <wlr/types/wlr_export_dmabuf_v1.h>
#include <wlr/types/wlr_linux_dmabuf.h>
#include <wlr/types/wlr_output.h>
#include "wlr-export-dmabuf-unstable-v1-protocol.h"
#define EXPORT_DMABUF_MANAGER_VERSION 1
static const struct zwlr_export_dmabuf_frame_v1_interface frame_impl;
static struct wlr_export_dmabuf_frame_v1 *frame_from_resource(
struct wl_resource *resource) {
assert(wl_resource_instance_of(resource,
&zwlr_export_dmabuf_frame_v1_interface, &frame_impl));
return wl_resource_get_user_data(resource);
}
static void frame_handle_destroy(struct wl_client *client,
struct wl_resource *resource) {
wl_resource_destroy(resource);
}
static const struct zwlr_export_dmabuf_frame_v1_interface frame_impl = {
.destroy = frame_handle_destroy,
};
static void frame_handle_resource_destroy(struct wl_resource *resource) {
struct wlr_export_dmabuf_frame_v1 *frame = frame_from_resource(resource);
wl_list_remove(&frame->link);
free(frame);
}
static const struct zwlr_export_dmabuf_manager_v1_interface manager_impl;
static struct wlr_export_dmabuf_manager_v1 *manager_from_resource(
struct wl_resource *resource) {
assert(wl_resource_instance_of(resource,
&zwlr_export_dmabuf_manager_v1_interface, &manager_impl));
return wl_resource_get_user_data(resource);
}
static void manager_handle_capture_client(struct wl_client *client,
struct wl_resource *manager_resource, uint32_t id,
uint32_t client_id, int32_t overlay_cursor) {
// TODO
}
static void manager_handle_capture_output(struct wl_client *client,
struct wl_resource *manager_resource, uint32_t id,
struct wl_resource *output_resource) {
struct wlr_export_dmabuf_manager_v1 *manager =
manager_from_resource(manager_resource);
struct wlr_output *output = wlr_output_from_resource(output_resource);
struct wlr_export_dmabuf_frame_v1 *frame =
calloc(1, sizeof(struct wlr_export_dmabuf_frame_v1));
if (frame == NULL) {
wl_resource_post_no_memory(manager_resource);
return;
}
frame->manager = manager;
frame->output = output;
uint32_t version = wl_resource_get_version(manager_resource);
frame->resource = wl_resource_create(client,
&zwlr_export_dmabuf_frame_v1_interface, version, id);
if (frame->resource == NULL) {
wl_client_post_no_memory(client);
return;
}
wl_resource_set_implementation(frame->resource, &frame_impl, frame,
frame_handle_resource_destroy);
wl_list_insert(&manager->frames, &frame->link);
struct wlr_dmabuf_buffer_attribs attribs;
if (!wlr_output_export_dmabuf(output, &attribs)) {
zwlr_export_dmabuf_frame_v1_send_abort(frame->resource);
return;
}
// TODO: multiple layers support
uint32_t frame_flags = 0;
uint32_t mod_high = attribs.modifier[0] >> 32;
uint32_t mod_low = attribs.modifier[0];
zwlr_export_dmabuf_frame_v1_send_frame(frame->resource,
output->width, output->height, output->scale, output->transform,
attribs.flags, frame_flags, mod_high, mod_low, attribs.n_planes, 1);
zwlr_export_dmabuf_frame_v1_send_dma_layer(frame->resource, 0,
attribs.format, 1);
for (int i = 0; i < attribs.n_planes; ++i) {
// TODO: what to do if the kernel doesn't support seek on buffer
off_t size = lseek(attribs.fd[i], 0, SEEK_END);
zwlr_export_dmabuf_frame_v1_send_dma_object(frame->resource, i,
attribs.fd[i], size);
zwlr_export_dmabuf_frame_v1_send_dma_plane(frame->resource, i, 0, i,
attribs.offset[i], attribs.stride[i]);
}
// TODO: wait for the frame to be ready
// TODO: timestamps
zwlr_export_dmabuf_frame_v1_send_ready(frame->resource, 0, 0, 0);
}
static const struct zwlr_export_dmabuf_manager_v1_interface manager_impl = {
.capture_client = manager_handle_capture_client,
.capture_output = manager_handle_capture_output,
};
static void manager_handle_resource_destroy(struct wl_resource *resource) {
wl_list_remove(wl_resource_get_link(resource));
}
static void manager_bind(struct wl_client *client, void *data, uint32_t version,
uint32_t id) {
struct wlr_export_dmabuf_manager_v1 *manager = data;
struct wl_resource *resource = wl_resource_create(client,
&zwlr_export_dmabuf_manager_v1_interface, version, id);
if (resource == NULL) {
wl_client_post_no_memory(client);
return;
}
wl_resource_set_implementation(resource, &manager_impl, manager,
manager_handle_resource_destroy);
wl_list_insert(&manager->resources, wl_resource_get_link(resource));
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_export_dmabuf_manager_v1 *manager =
wl_container_of(listener, manager, display_destroy);
wlr_export_dmabuf_manager_v1_destroy(manager);
}
struct wlr_export_dmabuf_manager_v1 *wlr_export_dmabuf_manager_v1_create(
struct wl_display *display) {
struct wlr_export_dmabuf_manager_v1 *manager =
calloc(1, sizeof(struct wlr_export_dmabuf_manager_v1));
if (manager == NULL) {
return NULL;
}
wl_list_init(&manager->resources);
wl_list_init(&manager->frames);
manager->global = wl_global_create(display,
&zwlr_export_dmabuf_manager_v1_interface, EXPORT_DMABUF_MANAGER_VERSION,
manager, manager_bind);
if (manager->global == NULL) {
free(manager);
return NULL;
}
manager->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &manager->display_destroy);
return manager;
}
void wlr_export_dmabuf_manager_v1_destroy(
struct wlr_export_dmabuf_manager_v1 *manager) {
if (manager == NULL) {
return;
}
wl_list_remove(&manager->display_destroy.link);
wl_global_destroy(manager->global);
struct wl_resource *resource, *resource_tmp;
wl_resource_for_each_safe(resource, resource_tmp, &manager->resources) {
wl_resource_destroy(resource);
}
struct wlr_export_dmabuf_frame_v1 *frame, *frame_tmp;
wl_list_for_each_safe(frame, frame_tmp, &manager->frames, link) {
wl_resource_destroy(frame->resource);
}
free(manager);
}