[RFC spice-server 2/2] streaming: Restart guest video streams on video-codec changes

[Kevin Pouget <kpouget@xxxxxxxxxx>]

This patch resets the host and guest video streams when the client
changes the preferred video-codecs or when the host admin updates the
list of video-codecs allowed.

Signed-off-by: Kevin Pouget <kpouget@xxxxxxxxxx>
---
 server/dcc.c             |  4 +++-
 server/display-channel.c |  2 +-
 server/video-stream.c    | 11 +++++++++++
 server/video-stream.h    |  1 +
 4 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/server/dcc.c b/server/dcc.c
index 21e8598e..1631a2b4 100644
--- a/server/dcc.c
+++ b/server/dcc.c
@@ -1193,7 +1193,9 @@ static int dcc_handle_preferred_video_codec_type(DisplayChannelClient *dcc,

     /* New client preference */
     dcc_update_preferred_video_codecs(dcc);
-    video_stream_detach_and_stop(DCC_TO_DC(dcc));
+
+    /* Reset video streams */
+    video_stream_codecs_changed(DCC_TO_DC(dcc));

     return TRUE;
 }
diff --git a/server/display-channel.c b/server/display-channel.c
index 75266598..65bc15ca 100644
--- a/server/display-channel.c
+++ b/server/display-channel.c
@@ -256,7 +256,7 @@ void display_channel_set_video_codecs(DisplayChannel *display, GArray *video_cod
     display->priv->video_codecs = g_array_ref(video_codecs);
     g_object_notify(G_OBJECT(display), "video-codecs");

-    video_stream_detach_and_stop(display);
+    video_stream_codecs_changed(display);
 }

 GArray *display_channel_get_video_codecs(DisplayChannel *display)
diff --git a/server/video-stream.c b/server/video-stream.c
index 6aa859a0..d0f0a401 100644
--- a/server/video-stream.c
+++ b/server/video-stream.c
@@ -20,6 +20,7 @@
 #include "display-channel-private.h"
 #include "main-channel-client.h"
 #include "red-client.h"
+#include "stream-channel.h"

 #define FPS_TEST_INTERVAL 1
 #define FOREACH_STREAMS(display, item)                  \
@@ -950,6 +951,16 @@ void video_stream_timeout(DisplayChannel *display)
     }
 }

+void video_stream_codecs_changed(DisplayChannel *display)
+{
+    /* Reset guest video streams */
+    if (IS_STREAM_CHANNEL(display)) {
+        stream_channel_reset(STREAM_CHANNEL(display));
+    }
+    /* Reset host video streams */
+    video_stream_detach_and_stop(display);
+}
+
 void video_stream_trace_add_drawable(DisplayChannel *display,
                                      Drawable *item)
 {
diff --git a/server/video-stream.h b/server/video-stream.h
index 46b076fd..fe74fc34 100644
--- a/server/video-stream.h
+++ b/server/video-stream.h
@@ -147,6 +147,7 @@ void video_stream_detach_and_stop(DisplayChannel *display);
 void video_stream_trace_add_drawable(DisplayChannel *display, Drawable *item);
 void video_stream_detach_behind(DisplayChannel *display, QRegion *region,
                                 Drawable *drawable);
+void video_stream_codecs_changed(DisplayChannel *display);

 void video_stream_agent_unref(DisplayChannel *display, VideoStreamAgent *agent);
 void video_stream_agent_stop(VideoStreamAgent *agent);
--
2.21.0
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