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screen-cast-src: Notify about the stream being closed after dispatch

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We're iterating inside the PipeWire loop when detecting PipeWire errors,
and shouldn't destroy the PipeWire objects mid-iteration. Avoid this by
first disabling the stream src (effectively stopping the recording),
then notifying about it being closed in an idle callback. The
notification eventually makes the rest of the screen cast code clean up
the objects, including the src and the associated PipeWire objects, but
will do so outside the PipeWire loop iteration.

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1251

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1251
This commit is contained in:
Jonas Ådahl 2020-05-12 16:14:00 +02:00 committed by Georges Basile Stavracas Neto
parent 8a541c08fb
commit c8e12ead08
1 changed files with 21 additions and 10 deletions
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31
src/backends/meta-screen-cast-stream-src.c
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@ -68,6 +68,7 @@ typedef struct _MetaPipeWireSource
{
GSource base;
MetaScreenCastStreamSrc *src;
struct pw_loop *pipewire_loop;
} MetaPipeWireSource;
@ -81,6 +82,7 @@ typedef struct _MetaScreenCastStreamSrcPrivate
struct spa_hook pipewire_core_listener;
gboolean is_enabled;
gboolean emit_closed_after_dispatch;
struct pw_stream *pipewire_stream;
struct spa_hook pipewire_stream_listener;
@ -540,12 +542,6 @@ meta_screen_cast_stream_src_disable (MetaScreenCastStreamSrc *src)
priv->is_enabled = FALSE;
}
static void
meta_screen_cast_stream_src_notify_closed (MetaScreenCastStreamSrc *src)
{
g_signal_emit (src, signals[CLOSED], 0);
}
static void
on_stream_state_changed (void *data,
enum pw_stream_state old,
@ -560,7 +556,9 @@ on_stream_state_changed (void *data,
{
case PW_STREAM_STATE_ERROR:
g_warning ("pipewire stream error: %s", error_message);
meta_screen_cast_stream_src_notify_closed (src);
if (meta_screen_cast_stream_src_is_enabled (src))
meta_screen_cast_stream_src_disable (src);
priv->emit_closed_after_dispatch = TRUE;
break;
case PW_STREAM_STATE_PAUSED:
if (priv->node_id == SPA_ID_INVALID && priv->pipewire_stream)
@ -828,11 +826,17 @@ on_core_error (void *data,
const char *message)
{
MetaScreenCastStreamSrc *src = data;
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
g_warning ("pipewire remote error: id:%u %s", id, message);
if (id == PW_ID_CORE && res == -EPIPE)
meta_screen_cast_stream_src_notify_closed (src);
{
if (meta_screen_cast_stream_src_is_enabled (src))
meta_screen_cast_stream_src_disable (src);
priv->emit_closed_after_dispatch = TRUE;
}
}
static gboolean
@ -849,12 +853,18 @@ pipewire_loop_source_dispatch (GSource *source,
gpointer user_data)
{
MetaPipeWireSource *pipewire_source = (MetaPipeWireSource *) source;
MetaScreenCastStreamSrc *src = pipewire_source->src;
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
int result;
result = pw_loop_iterate (pipewire_source->pipewire_loop, 0);
if (result < 0)
g_warning ("pipewire_loop_iterate failed: %s", spa_strerror (result));
if (priv->emit_closed_after_dispatch)
g_signal_emit (src, signals[CLOSED], 0);
return TRUE;
}
@ -876,13 +886,14 @@ static GSourceFuncs pipewire_source_funcs =
};
static MetaPipeWireSource *
create_pipewire_source (void)
create_pipewire_source (MetaScreenCastStreamSrc *src)
{
MetaPipeWireSource *pipewire_source;
pipewire_source =
(MetaPipeWireSource *) g_source_new (&pipewire_source_funcs,
sizeof (MetaPipeWireSource));
pipewire_source->src = src;
pipewire_source->pipewire_loop = pw_loop_new (NULL);
if (!pipewire_source->pipewire_loop)
{
@ -914,7 +925,7 @@ meta_screen_cast_stream_src_initable_init (GInitable *initable,
MetaScreenCastStreamSrcPrivate *priv =
meta_screen_cast_stream_src_get_instance_private (src);
priv->pipewire_source = create_pipewire_source ();
priv->pipewire_source = create_pipewire_source (src);
if (!priv->pipewire_source)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,