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Update example and protocol

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This commit is contained in:
Rostislav Pehlivanov 2018-06-17 14:06:52 +01:00
parent 21928cbe61
commit 9eddcbc376
2 changed files with 100 additions and 104 deletions
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28
examples/dmabuf-capture.c
View file

@ -163,8 +163,7 @@ static void frame_free(void *opaque, uint8_t *data) {
static void frame_start(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
uint32_t width, uint32_t height, uint32_t offset_x, uint32_t offset_y,
uint32_t buffer_flags, uint32_t flags, uint32_t format,
uint32_t mod_high, uint32_t mod_low, uint32_t num_objects,
uint32_t num_planes) {
uint32_t mod_high, uint32_t mod_low, uint32_t num_objects) {
struct capture_context *ctx = data;
int err = 0;
@ -180,7 +179,6 @@ static void frame_start(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
desc->nb_layers = 1;
desc->layers[0].format = format;
desc->layers[0].nb_planes = num_planes;
/* Allocate a frame */
AVFrame *f = av_frame_alloc();
@ -213,25 +211,18 @@ fail:
}
static void frame_object(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
uint32_t index, int32_t fd, uint32_t size) {
uint32_t index, int32_t fd, uint32_t size, uint32_t offset,
uint32_t stride, uint32_t plane_index) {
struct capture_context *ctx = data;
AVFrame *f = ctx->current_frame;
AVDRMFrameDescriptor *desc = (AVDRMFrameDescriptor *)f->data[0];
desc->objects[index].fd = fd;
desc->objects[index].size = size;
}
static void frame_plane(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
uint32_t index, uint32_t object_index,
uint32_t offset, uint32_t stride) {
struct capture_context *ctx = data;
AVFrame *f = ctx->current_frame;
AVDRMFrameDescriptor *desc = (AVDRMFrameDescriptor *)f->data[0];
desc->layers[0].planes[index].object_index = object_index;
desc->layers[0].planes[index].offset = offset;
desc->layers[0].planes[index].pitch = stride;
desc->layers[0].planes[plane_index].object_index = index;
desc->layers[0].planes[plane_index].offset = offset;
desc->layers[0].planes[plane_index].pitch = stride;
}
static const uint32_t pixfmt_to_drm_map[] = {
@ -311,14 +302,18 @@ static void frame_ready(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
struct capture_context *ctx = data;
AVFrame *f = ctx->current_frame;
AVDRMFrameDescriptor *desc = (AVDRMFrameDescriptor *)f->data[0];
enum AVPixelFormat pix_fmt = drm_fmt_to_pixfmt(desc->layers[0].format);
int err = 0;
/* Attach the hardware frame context to the frame */
err = attach_drm_frames_ref(ctx, f, drm_fmt_to_pixfmt(desc->layers[0].format));
err = attach_drm_frames_ref(ctx, f, pix_fmt);
if (err) {
goto end;
}
/* TODO: support multiplane stuff */
desc->layers[0].nb_planes = av_pix_fmt_count_planes(pix_fmt);
AVFrame *mapped_frame = av_frame_alloc();
if (!mapped_frame) {
err = AVERROR(ENOMEM);
@ -431,7 +426,6 @@ static void frame_cancel(void *data, struct zwlr_export_dmabuf_frame_v1 *frame,
static const struct zwlr_export_dmabuf_frame_v1_listener frame_listener = {
.frame = frame_start,
.object = frame_object,
.plane = frame_plane,
.ready = frame_ready,
.cancel = frame_cancel,
};

176
protocol/wlr-export-dmabuf-unstable-v1.xml
View file

@ -1,6 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<protocol name="wlr_export_dmabuf_unstable_v1">
<copyright>
Copyright © 2018 Rostislav Pehlivanov
@ -25,29 +24,56 @@
</copyright>
<description summary="a protocol for low overhead screen content capturing">
An interface to capture surfaces in an efficient way.
Overall usage:
An interface to capture surfaces in an efficient way by exporting DMA-BUFs.
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.)
Warning! The protocol described in this file is experimental and
backward incompatible changes may be made. Backward compatible changes
may be added together with the corresponding interface version bump.
Backward incompatible changes are done by bumping the version number in
the protocol and interface names and resetting the interface version.
Once the protocol is to be declared stable, the 'z' prefix and the
version number in the protocol and interface names are removed and the
interface version number is reset.
</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.
<interface name="zwlr_export_dmabuf_manager_v1" version="1">
<description summary="manager to inform clients and begin capturing">
This object is a manager with which to start capturing from sources.
</description>
<request name="capture_output">
<description summary="capture a frame from an output">
Capture the next frame of a an entire output.
</description>
<arg name="frame" type="new_id" interface="zwlr_export_dmabuf_frame_v1"/>
<arg name="overlay_cursor" type="int"
summary="include custom client hardware cursor on top of the frame"/>
<arg name="output" type="object" interface="wl_output"/>
</request>
<request name="destroy" type="destructor">
<description summary="destroy the manager">
All objects created by the manager will still remain valid, until their
appropriate destroy request has been called.
</description>
</request>
</interface>
<interface name="zwlr_export_dmabuf_frame_v1" version="1">
<description summary="a DMA-BUF frame">
This object represents a single DMA-BUF frame.
If the capture is successful, the compositor will first send a "frame"
event, followed by one or several "object". When the frame is available
for readout, the "ready" event is sent.
If the capture failed, the "cancel" event is sent. This can happen anytime
before the "ready" event.
Once either a "ready" or a "cancel" event is received, the client should
destroy the frame. Once an "object" event is received, the client is
responsible for closing the associated file descriptor.
The receive callback shall be called first, followed by the "object"
callback once per dmabuf object or the "plane" callback, once per dmabuf
plane. The "ready" event is called last 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 and
by calling close() on the file descriptors received.
All frames are read-only and may not be written into or altered.
</description>
@ -55,25 +81,23 @@
<description summary="frame flags">
Special flags that should be respected by the client.
</description>
<entry name="transient" value="0x1" since="1"
<entry name="transient" value="0x1"
summary="clients should copy frame before processing"/>
</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.
<description summary="a frame description">
Main event supplying the client with information about the frame. If the
capture didn't fail, this event is always emitted 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.
This event is followed by a number of "object" as specified by the
"num_objects" argument.
</description>
<arg name="width" type="uint"
summary="frame width, scaling factor included"/>
summary="frame width in pixels"/>
<arg name="height" type="uint"
summary="frame height, scaling factor included"/>
summary="frame height in pixels"/>
<arg name="offset_x" type="uint"
summary="crop offset for the x axis"/>
<arg name="offset_y" type="uint"
@ -91,13 +115,15 @@
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_planes" type="uint"
summary="indicates how many planes the frame has (max 4)"/>
</event>
<event name="object">
<description summary="object receiving callback">
Callback which serves to supply the client with the file descriptors
<description summary="an object description">
Event which serves to supply the client with the file descriptors
containing the data for each object.
After receiving this event, the client must always close the file
descriptor as soon as they're done with it and even if the frame fails.
</description>
<arg name="index" type="uint"
summary="index of the current object"/>
@ -105,31 +131,28 @@
summary="fd of the current object"/>
<arg name="size" type="uint"
summary="size in bytes for the current object"/>
</event>
<event name="plane">
<description summary="plane info receiving callback">
Callback which supplies the client with plane information for each
plane.
</description>
<arg name="index" type="uint"
summary="index of the current plane"/>
<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"/>
<arg name="plane_index" type="uint"
summary="index of the the plane the data in the object applies to"/>
</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.
This event is sent as soon as the frame is presented, indicating it is
available for reading. This event includes the time at which
presentation happened at.
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.
for valid timestamps tv_nsec must be in [0, 999999999]. The seconds part
may have an arbitrary offset at start.
After receiving this event, the client should destroy this object.
</description>
<arg name="tv_sec_hi" type="uint"
summary="high 32 bits of the seconds part of the timestamp"/>
@ -143,22 +166,25 @@
<description summary="cancel reason">
Indicates reason for cancelling the frame.
</description>
<entry name="temporary" value="0" since="1"
<entry name="temporary" value="0"
summary="temporary error, source will produce more frames"/>
<entry name="pernament" value="1" since="1"
<entry name="permanent" value="1"
summary="fatal error, source will not produce frames"/>
<entry name="resizing" value="2" since="1"
summary="temporary error, source will produce frames"/>
<entry name="resizing" value="2"
summary="temporary error, source will produce more frames"/>
</enum>
<event name="cancel">
<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.
If the capture failed or if the frame is no longer valid after the
"frame" event has been emitted, this event will be used to inform the
client to scrap the frame.
If the failure is temporary, the client may capture again the same
source. If the failure is permanent, any further attempts to capture the
same source will fail again.
After receiving this event, the client should destroy this object.
</description>
<arg name="reason" type="uint" enum="cancel_reason"
summary="indicates a reason for cancelling this frame capture"/>
@ -166,35 +192,11 @@
<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.
Can be called at any time by the client after the "frame" event, after
which the compositor will not call any other events unless the client
resubscribes to capture more. The client will still have to close any
FDs it has been given.
</description>
</request>
</interface>
Unreferences the frame. This request must be called as soon as its no
longer used.
<interface name="zwlr_export_dmabuf_manager_v1" version="1">
<description summary="manager to inform clients and begin capturing">
This object is a manager with which to start capturing from sources.
</description>
<request name="capture_output">
<description summary="subscribe to start capturing">
Request to start capturing from an entire wl_output.
</description>
<arg name="frame" type="new_id"
interface="zwlr_export_dmabuf_frame_v1"/>
<arg name="overlay_cursor" type="int"
summary="include custom client hardware cursor on top of the frame"/>
<arg name="output" type="object" interface="wl_output"/>
</request>
<request name="destroy" type="destructor">
<description summary="destroy the manager">
All objects created by the manager will still remain valid, until their
appropriate destroy request has been called.
It can be called at any time by the client. The client will still have
to close any FDs it has been given.
</description>
</request>
</interface>