mirror of
https://github.com/brl/mutter.git
synced 2024-11-21 15:40:41 -05:00
screen-cast-stream-src: Support DMA buffer sharing
Implement PipeWire's add_buffer and remove buffer, try and export a DMA buffer first and, on failure, fallback to memfd. When DMA buffers are successfully created and shared, blit the framebuffer contents when drawing instead of downloading the pixels. https://gitlab.gnome.org/GNOME/mutter/merge_requests/1086
This commit is contained in:
Georges Basile Stavracas Neto
parent
d366fb335d
commit
548073ec27
@ -25,6 +25,7 @@
|
||||
#include "backends/meta-screen-cast-stream-src.h"
|
||||
|
||||
#include <errno.h>
|
||||
#include <fcntl.h>
|
||||
#include <pipewire/pipewire.h>
|
||||
#include <spa/param/props.h>
|
||||
#include <spa/param/format-utils.h>
|
||||
@ -90,6 +91,8 @@ typedef struct _MetaScreenCastStreamSrcPrivate
|
||||
|
||||
uint64_t last_frame_timestamp_us;
|
||||
|
||||
GHashTable *dmabuf_handles;
|
||||
|
||||
int stream_width;
|
||||
int stream_height;
|
||||
} MetaScreenCastStreamSrcPrivate;
|
||||
@ -139,6 +142,19 @@ meta_screen_cast_stream_src_record_frame (MetaScreenCastStreamSrc *src,
|
||||
return klass->record_frame (src, data);
|
||||
}
|
||||
|
||||
static gboolean
|
||||
meta_screen_cast_stream_src_blit_to_framebuffer (MetaScreenCastStreamSrc *src,
|
||||
CoglFramebuffer *framebuffer)
|
||||
{
|
||||
MetaScreenCastStreamSrcClass *klass =
|
||||
META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src);
|
||||
|
||||
if (klass->blit_to_framebuffer)
|
||||
return klass->blit_to_framebuffer (src, framebuffer);
|
||||
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
static void
|
||||
meta_screen_cast_stream_src_set_cursor_metadata (MetaScreenCastStreamSrc *src,
|
||||
struct spa_meta_cursor *spa_meta_cursor)
|
||||
@ -394,6 +410,33 @@ maybe_record_cursor (MetaScreenCastStreamSrc *src,
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
|
||||
static gboolean
|
||||
do_record_frame (MetaScreenCastStreamSrc *src,
|
||||
struct spa_buffer *spa_buffer,
|
||||
uint8_t *data)
|
||||
{
|
||||
MetaScreenCastStreamSrcPrivate *priv =
|
||||
meta_screen_cast_stream_src_get_instance_private (src);
|
||||
|
||||
if (spa_buffer->datas[0].data ||
|
||||
spa_buffer->datas[0].type == SPA_DATA_MemFd)
|
||||
{
|
||||
return meta_screen_cast_stream_src_record_frame (src, data);
|
||||
}
|
||||
else if (spa_buffer->datas[0].type == SPA_DATA_DmaBuf)
|
||||
{
|
||||
CoglDmaBufHandle *dmabuf_handle =
|
||||
g_hash_table_lookup (priv->dmabuf_handles,
|
||||
GINT_TO_POINTER (spa_buffer->datas[0].fd));
|
||||
CoglFramebuffer *dmabuf_fbo =
|
||||
cogl_dma_buf_handle_get_framebuffer (dmabuf_handle);
|
||||
|
||||
return meta_screen_cast_stream_src_blit_to_framebuffer (src, dmabuf_fbo);
|
||||
}
|
||||
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
void
|
||||
meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
|
||||
{
|
||||
@ -402,8 +445,7 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
|
||||
MetaRectangle crop_rect;
|
||||
struct pw_buffer *buffer;
|
||||
struct spa_buffer *spa_buffer;
|
||||
uint8_t *map = NULL;
|
||||
uint8_t *data;
|
||||
uint8_t *data = NULL;
|
||||
uint64_t now_us;
|
||||
|
||||
now_us = g_get_monotonic_time ();
|
||||
@ -424,32 +466,15 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
|
||||
}
|
||||
|
||||
spa_buffer = buffer->buffer;
|
||||
data = spa_buffer->datas[0].data;
|
||||
|
||||
if (spa_buffer->datas[0].data)
|
||||
if (spa_buffer->datas[0].type != SPA_DATA_DmaBuf && !data)
|
||||
{
|
||||
data = spa_buffer->datas[0].data;
|
||||
}
|
||||
else if (spa_buffer->datas[0].type == SPA_DATA_MemFd)
|
||||
{
|
||||
map = mmap (NULL, spa_buffer->datas[0].maxsize + spa_buffer->datas[0].mapoffset,
|
||||
PROT_READ | PROT_WRITE, MAP_SHARED,
|
||||
spa_buffer->datas[0].fd, 0);
|
||||
if (map == MAP_FAILED)
|
||||
{
|
||||
g_warning ("Failed to mmap pipewire stream buffer: %s",
|
||||
strerror (errno));
|
||||
return;
|
||||
}
|
||||
|
||||
data = SPA_MEMBER (map, spa_buffer->datas[0].mapoffset, uint8_t);
|
||||
}
|
||||
else
|
||||
{
|
||||
g_warning ("Unhandled spa buffer type: %d", spa_buffer->datas[0].type);
|
||||
g_critical ("Invalid buffer data");
|
||||
return;
|
||||
}
|
||||
|
||||
if (meta_screen_cast_stream_src_record_frame (src, data))
|
||||
if (do_record_frame (src, spa_buffer, data))
|
||||
{
|
||||
struct spa_meta_region *spa_meta_video_crop;
|
||||
|
||||
@ -487,9 +512,6 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src)
|
||||
|
||||
priv->last_frame_timestamp_us = now_us;
|
||||
|
||||
if (map)
|
||||
munmap (map, spa_buffer->datas[0].maxsize + spa_buffer->datas[0].mapoffset);
|
||||
|
||||
pw_stream_queue_buffer (priv->pipewire_stream, buffer);
|
||||
}
|
||||
|
||||
@ -618,10 +640,116 @@ on_stream_param_changed (void *data,
|
||||
pw_stream_update_params (priv->pipewire_stream, params, G_N_ELEMENTS (params));
|
||||
}
|
||||
|
||||
static void
|
||||
on_stream_add_buffer (void *data,
|
||||
struct pw_buffer *buffer)
|
||||
{
|
||||
MetaScreenCastStreamSrc *src = data;
|
||||
MetaScreenCastStreamSrcPrivate *priv =
|
||||
meta_screen_cast_stream_src_get_instance_private (src);
|
||||
CoglContext *context =
|
||||
clutter_backend_get_cogl_context (clutter_get_default_backend ());
|
||||
CoglRenderer *renderer = cogl_context_get_renderer (context);
|
||||
g_autoptr (GError) error = NULL;
|
||||
CoglDmaBufHandle *dmabuf_handle;
|
||||
struct spa_buffer *spa_buffer = buffer->buffer;
|
||||
struct spa_data *spa_data = spa_buffer->datas;
|
||||
const int bpp = 4;
|
||||
int stride;
|
||||
|
||||
stride = SPA_ROUND_UP_N (priv->video_format.size.width * bpp, 4);
|
||||
|
||||
spa_data[0].mapoffset = 0;
|
||||
spa_data[0].maxsize = stride * priv->video_format.size.height;
|
||||
|
||||
dmabuf_handle = cogl_renderer_create_dma_buf (renderer,
|
||||
priv->stream_width,
|
||||
priv->stream_height,
|
||||
&error);
|
||||
|
||||
if (error)
|
||||
g_debug ("Error exporting DMA buffer handle: %s", error->message);
|
||||
|
||||
if (dmabuf_handle)
|
||||
{
|
||||
spa_data[0].type = SPA_DATA_DmaBuf;
|
||||
spa_data[0].flags = SPA_DATA_FLAG_READWRITE;
|
||||
spa_data[0].fd = cogl_dma_buf_handle_get_fd (dmabuf_handle);
|
||||
spa_data[0].data = NULL;
|
||||
|
||||
g_hash_table_insert (priv->dmabuf_handles,
|
||||
GINT_TO_POINTER (spa_data[0].fd),
|
||||
dmabuf_handle);
|
||||
}
|
||||
else
|
||||
{
|
||||
unsigned int seals;
|
||||
|
||||
/* Fallback to a memfd buffer */
|
||||
spa_data[0].type = SPA_DATA_MemFd;
|
||||
spa_data[0].flags = SPA_DATA_FLAG_READWRITE;
|
||||
spa_data[0].fd = memfd_create ("mutter-screen-cast-memfd",
|
||||
MFD_CLOEXEC | MFD_ALLOW_SEALING);
|
||||
if (spa_data[0].fd == -1)
|
||||
{
|
||||
g_critical ("Can't create memfd: %m");
|
||||
return;
|
||||
}
|
||||
spa_data[0].mapoffset = 0;
|
||||
spa_data[0].maxsize = stride * priv->video_format.size.height;
|
||||
|
||||
if (ftruncate (spa_data[0].fd, spa_data[0].maxsize) < 0)
|
||||
{
|
||||
g_critical ("Can't truncate to %d: %m", spa_data[0].maxsize);
|
||||
return;
|
||||
}
|
||||
|
||||
seals = F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL;
|
||||
if (fcntl (spa_data[0].fd, F_ADD_SEALS, seals) == -1)
|
||||
g_warning ("Failed to add seals: %m");
|
||||
|
||||
spa_data[0].data = mmap (NULL,
|
||||
spa_data[0].maxsize,
|
||||
PROT_READ | PROT_WRITE,
|
||||
MAP_SHARED,
|
||||
spa_data[0].fd,
|
||||
spa_data[0].mapoffset);
|
||||
if (spa_data[0].data == MAP_FAILED)
|
||||
{
|
||||
g_critical ("Failed to mmap memory: %m");
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
on_stream_remove_buffer (void *data,
|
||||
struct pw_buffer *buffer)
|
||||
{
|
||||
MetaScreenCastStreamSrc *src = data;
|
||||
MetaScreenCastStreamSrcPrivate *priv =
|
||||
meta_screen_cast_stream_src_get_instance_private (src);
|
||||
struct spa_buffer *spa_buffer = buffer->buffer;
|
||||
struct spa_data *spa_data = spa_buffer->datas;
|
||||
|
||||
if (spa_data[0].type == SPA_DATA_DmaBuf)
|
||||
{
|
||||
if (!g_hash_table_remove (priv->dmabuf_handles, GINT_TO_POINTER (spa_data[0].fd)))
|
||||
g_critical ("Failed to remove non-exported DMA buffer");
|
||||
}
|
||||
else if (spa_data[0].type == SPA_DATA_MemFd)
|
||||
{
|
||||
munmap (spa_data[0].data, spa_data[0].maxsize);
|
||||
close (spa_data[0].fd);
|
||||
}
|
||||
}
|
||||
|
||||
static const struct pw_stream_events stream_events = {
|
||||
PW_VERSION_STREAM_EVENTS,
|
||||
.state_changed = on_stream_state_changed,
|
||||
.param_changed = on_stream_param_changed,
|
||||
.add_buffer = on_stream_add_buffer,
|
||||
.remove_buffer = on_stream_remove_buffer,
|
||||
};
|
||||
|
||||
static struct pw_stream *
|
||||
@ -686,7 +814,7 @@ create_pipewire_stream (MetaScreenCastStreamSrc *src,
|
||||
PW_DIRECTION_OUTPUT,
|
||||
SPA_ID_INVALID,
|
||||
(PW_STREAM_FLAG_DRIVER |
|
||||
PW_STREAM_FLAG_MAP_BUFFERS),
|
||||
PW_STREAM_FLAG_ALLOC_BUFFERS),
|
||||
params, G_N_ELEMENTS (params));
|
||||
if (result != 0)
|
||||
{
|
||||
@ -854,6 +982,7 @@ meta_screen_cast_stream_src_finalize (GObject *object)
|
||||
if (meta_screen_cast_stream_src_is_enabled (src))
|
||||
meta_screen_cast_stream_src_disable (src);
|
||||
|
||||
g_clear_pointer (&priv->dmabuf_handles, g_hash_table_destroy);
|
||||
g_clear_pointer (&priv->pipewire_stream, pw_stream_destroy);
|
||||
g_clear_pointer (&priv->pipewire_core, pw_core_disconnect);
|
||||
g_clear_pointer (&priv->pipewire_context, pw_context_destroy);
|
||||
@ -905,6 +1034,12 @@ meta_screen_cast_stream_src_get_property (GObject *object,
|
||||
static void
|
||||
meta_screen_cast_stream_src_init (MetaScreenCastStreamSrc *src)
|
||||
{
|
||||
MetaScreenCastStreamSrcPrivate *priv =
|
||||
meta_screen_cast_stream_src_get_instance_private (src);
|
||||
|
||||
priv->dmabuf_handles =
|
||||
g_hash_table_new_full (NULL, NULL, NULL,
|
||||
(GDestroyNotify) cogl_dma_buf_handle_free);
|
||||
}
|
||||
|
||||
static void
|
||||
|
||||
@ -55,6 +55,8 @@ struct _MetaScreenCastStreamSrcClass
|
||||
void (* disable) (MetaScreenCastStreamSrc *src);
|
||||
gboolean (* record_frame) (MetaScreenCastStreamSrc *src,
|
||||
uint8_t *data);
|
||||
gboolean (* blit_to_framebuffer) (MetaScreenCastStreamSrc *src,
|
||||
CoglFramebuffer *framebuffer);
|
||||
gboolean (* get_videocrop) (MetaScreenCastStreamSrc *src,
|
||||
MetaRectangle *crop_rect);
|
||||
void (* set_cursor_metadata) (MetaScreenCastStreamSrc *src,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user