From e8052f169b957a502bf86ca65071582692039b9c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jonas=20=C3=85dahl?= Date: Fri, 3 Jul 2020 23:57:31 +0200 Subject: [PATCH] screen-cast/src: Record follow up frame after timeout During animation or other things that cause multiple frames in a row being painted, we might skip recording frames if the max framerate is reached. Doing so means we might end up skipping the last frame in a series, ending with the last frame we sent was not the last one, making things appear to get stuck sometimes. Handle this by creating a timeout if we ever throttle, and at the time the timeout callback is triggered, make sure we eventually send an up to date frame. This is handle differently depending on the source type. A monitor source type reports 1x1 pixel damage on each view its monitor overlaps, while a window source type simply records a frame from the surface directly, except without recording a timestamp, so that timestamps always refer to when damage actually happened. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1351 --- .../meta-screen-cast-monitor-stream-src.c | 43 +++++++++++ src/backends/meta-screen-cast-stream-src.c | 77 +++++++++++++++++-- src/backends/meta-screen-cast-stream-src.h | 4 + .../meta-screen-cast-window-stream-src.c | 11 +++ 4 files changed, 130 insertions(+), 5 deletions(-) diff --git a/src/backends/meta-screen-cast-monitor-stream-src.c b/src/backends/meta-screen-cast-monitor-stream-src.c index 570f16b4e..c902e98e5 100644 --- a/src/backends/meta-screen-cast-monitor-stream-src.c +++ b/src/backends/meta-screen-cast-monitor-stream-src.c @@ -191,6 +191,9 @@ sync_cursor_state (MetaScreenCastMonitorStreamSrc *monitor_src) if (clutter_stage_is_redraw_queued (stage)) return; + if (meta_screen_cast_stream_src_pending_follow_up_frame (src)) + return; + flags = META_SCREEN_CAST_RECORD_FLAG_CURSOR_ONLY; meta_screen_cast_stream_src_maybe_record_frame (src, flags); } @@ -440,6 +443,44 @@ meta_screen_cast_monitor_stream_src_record_to_framebuffer (MetaScreenCastStreamS return TRUE; } +static void +meta_screen_cast_monitor_stream_record_follow_up (MetaScreenCastStreamSrc *src) +{ + MetaScreenCastMonitorStreamSrc *monitor_src = + META_SCREEN_CAST_MONITOR_STREAM_SRC (src); + MetaBackend *backend = get_backend (monitor_src); + MetaRenderer *renderer = meta_backend_get_renderer (backend); + ClutterStage *stage = get_stage (monitor_src); + MetaMonitor *monitor; + MetaLogicalMonitor *logical_monitor; + MetaRectangle logical_monitor_layout; + GList *l; + + monitor = get_monitor (monitor_src); + logical_monitor = meta_monitor_get_logical_monitor (monitor); + logical_monitor_layout = meta_logical_monitor_get_layout (logical_monitor); + + for (l = meta_renderer_get_views (renderer); l; l = l->next) + { + MetaRendererView *view = l->data; + MetaRectangle view_layout; + MetaRectangle damage; + + clutter_stage_view_get_layout (CLUTTER_STAGE_VIEW (view), &view_layout); + + if (!meta_rectangle_overlap (&logical_monitor_layout, &view_layout)) + continue; + + damage = (cairo_rectangle_int_t) { + .x = view_layout.x, + .y = view_layout.y, + .width = 1, + .height = 1, + }; + clutter_actor_queue_redraw_with_clip (CLUTTER_ACTOR (stage), &damage); + } +} + static void meta_screen_cast_monitor_stream_src_set_cursor_metadata (MetaScreenCastStreamSrc *src, struct spa_meta_cursor *spa_meta_cursor) @@ -564,6 +605,8 @@ meta_screen_cast_monitor_stream_src_class_init (MetaScreenCastMonitorStreamSrcCl meta_screen_cast_monitor_stream_src_record_to_buffer; src_class->record_to_framebuffer = meta_screen_cast_monitor_stream_src_record_to_framebuffer; + src_class->record_follow_up = + meta_screen_cast_monitor_stream_record_follow_up; src_class->set_cursor_metadata = meta_screen_cast_monitor_stream_src_set_cursor_metadata; } diff --git a/src/backends/meta-screen-cast-stream-src.c b/src/backends/meta-screen-cast-stream-src.c index 992168107..8412642b9 100644 --- a/src/backends/meta-screen-cast-stream-src.c +++ b/src/backends/meta-screen-cast-stream-src.c @@ -92,6 +92,7 @@ typedef struct _MetaScreenCastStreamSrcPrivate int video_stride; int64_t last_frame_timestamp_us; + guint follow_up_frame_source_id; GHashTable *dmabuf_handles; @@ -109,6 +110,12 @@ G_DEFINE_TYPE_WITH_CODE (MetaScreenCastStreamSrc, meta_screen_cast_stream_src_init_initable_iface) G_ADD_PRIVATE (MetaScreenCastStreamSrc)) +static inline uint32_t +us2ms (uint64_t us) +{ + return (uint32_t) (us / 1000); +} + static void meta_screen_cast_stream_src_get_specs (MetaScreenCastStreamSrc *src, int *width, @@ -156,6 +163,15 @@ meta_screen_cast_stream_src_record_to_framebuffer (MetaScreenCastStreamSrc *src return klass->record_to_framebuffer (src, framebuffer, error); } +static void +meta_screen_cast_stream_src_record_follow_up (MetaScreenCastStreamSrc *src) +{ + MetaScreenCastStreamSrcClass *klass = + META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src); + + klass->record_follow_up (src); +} + static void meta_screen_cast_stream_src_set_cursor_metadata (MetaScreenCastStreamSrc *src, struct spa_meta_cursor *spa_meta_cursor) @@ -442,6 +458,43 @@ do_record_frame (MetaScreenCastStreamSrc *src, return FALSE; } +gboolean +meta_screen_cast_stream_src_pending_follow_up_frame (MetaScreenCastStreamSrc *src) +{ + MetaScreenCastStreamSrcPrivate *priv = + meta_screen_cast_stream_src_get_instance_private (src); + + return priv->follow_up_frame_source_id != 0; +} + +static gboolean +follow_up_frame_cb (gpointer user_data) +{ + MetaScreenCastStreamSrc *src = user_data; + MetaScreenCastStreamSrcPrivate *priv = + meta_screen_cast_stream_src_get_instance_private (src); + + priv->follow_up_frame_source_id = 0; + meta_screen_cast_stream_src_record_follow_up (src); + + return G_SOURCE_REMOVE; +} + +static void +maybe_schedule_follow_up_frame (MetaScreenCastStreamSrc *src, + int64_t timeout_us) +{ + MetaScreenCastStreamSrcPrivate *priv = + meta_screen_cast_stream_src_get_instance_private (src); + + if (priv->follow_up_frame_source_id) + return; + + priv->follow_up_frame_source_id = g_timeout_add (us2ms (timeout_us), + follow_up_frame_cb, + src); +} + void meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src, MetaScreenCastRecordFlag flags) @@ -457,11 +510,24 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src, now_us = g_get_monotonic_time (); if (priv->video_format.max_framerate.num > 0 && - priv->last_frame_timestamp_us != 0 && - (now_us - priv->last_frame_timestamp_us < - ((1000000 * priv->video_format.max_framerate.denom) / - priv->video_format.max_framerate.num))) - return; + priv->last_frame_timestamp_us != 0) + { + int64_t min_interval_us; + int64_t time_since_last_frame_us; + + min_interval_us = ((1000000 * priv->video_format.max_framerate.denom) / + priv->video_format.max_framerate.num); + + time_since_last_frame_us = now_us - priv->last_frame_timestamp_us; + if (time_since_last_frame_us < min_interval_us) + { + int64_t timeout_us; + + timeout_us = min_interval_us - time_since_last_frame_us; + maybe_schedule_follow_up_frame (src, timeout_us); + return; + } + } if (!priv->pipewire_stream) return; @@ -481,6 +547,7 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src, if (!(flags & META_SCREEN_CAST_RECORD_FLAG_CURSOR_ONLY)) { + g_clear_handle_id (&priv->follow_up_frame_source_id, g_source_remove); if (do_record_frame (src, spa_buffer, data, &error)) { struct spa_meta_region *spa_meta_video_crop; diff --git a/src/backends/meta-screen-cast-stream-src.h b/src/backends/meta-screen-cast-stream-src.h index 152790ecf..81ea20b17 100644 --- a/src/backends/meta-screen-cast-stream-src.h +++ b/src/backends/meta-screen-cast-stream-src.h @@ -65,6 +65,8 @@ struct _MetaScreenCastStreamSrcClass gboolean (* record_to_framebuffer) (MetaScreenCastStreamSrc *src, CoglFramebuffer *framebuffer, GError **error); + void (* record_follow_up) (MetaScreenCastStreamSrc *src); + gboolean (* get_videocrop) (MetaScreenCastStreamSrc *src, MetaRectangle *crop_rect); void (* set_cursor_metadata) (MetaScreenCastStreamSrc *src, @@ -74,6 +76,8 @@ struct _MetaScreenCastStreamSrcClass void meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc *src, MetaScreenCastRecordFlag flags); +gboolean meta_screen_cast_stream_src_pending_follow_up_frame (MetaScreenCastStreamSrc *src); + MetaScreenCastStream * meta_screen_cast_stream_src_get_stream (MetaScreenCastStreamSrc *src); gboolean meta_screen_cast_stream_src_draw_cursor_into (MetaScreenCastStreamSrc *src, diff --git a/src/backends/meta-screen-cast-window-stream-src.c b/src/backends/meta-screen-cast-window-stream-src.c index a504bd194..e80cd5e36 100644 --- a/src/backends/meta-screen-cast-window-stream-src.c +++ b/src/backends/meta-screen-cast-window-stream-src.c @@ -509,6 +509,15 @@ meta_screen_cast_window_stream_src_record_to_framebuffer (MetaScreenCastStreamSr return TRUE; } +static void +meta_screen_cast_window_stream_record_follow_up (MetaScreenCastStreamSrc *src) +{ + MetaScreenCastRecordFlag flags; + + flags = META_SCREEN_CAST_RECORD_FLAG_NONE; + meta_screen_cast_stream_src_maybe_record_frame (src, flags); +} + static void meta_screen_cast_window_stream_src_set_cursor_metadata (MetaScreenCastStreamSrc *src, struct spa_meta_cursor *spa_meta_cursor) @@ -596,6 +605,8 @@ meta_screen_cast_window_stream_src_class_init (MetaScreenCastWindowStreamSrcClas meta_screen_cast_window_stream_src_record_to_buffer; src_class->record_to_framebuffer = meta_screen_cast_window_stream_src_record_to_framebuffer; + src_class->record_follow_up = + meta_screen_cast_window_stream_record_follow_up; src_class->get_videocrop = meta_screen_cast_window_stream_src_get_videocrop; src_class->set_cursor_metadata = meta_screen_cast_window_stream_src_set_cursor_metadata; }