[RFC v2 1/2] spice: Add an option for users to provide a preferred codec

[Vivek Kasireddy <vivek.kasireddy@intel.com>]

Giving users an option to choose a particular codec will enable
them to make an appropriate decision based on their hardware and
use-case.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Dongwon Kim <dongwon.kim@intel.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
---
 qemu-options.hx |  5 +++++
 ui/spice-core.c | 14 ++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/qemu-options.hx b/qemu-options.hx
index 3aa3a2f5a3..aab8df0922 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2142,6 +2142,7 @@ DEF("spice", HAS_ARG, QEMU_OPTION_spice,
     "       [,streaming-video=[off|all|filter]][,disable-copy-paste=on|off]\n"
     "       [,disable-agent-file-xfer=on|off][,agent-mouse=[on|off]]\n"
     "       [,playback-compression=[on|off]][,seamless-migration=[on|off]]\n"
+    "       [,preferred-codec=<encoder>:<codec>\n"
     "       [,gl=[on|off]][,rendernode=<file>]\n"
     "   enable spice\n"
     "   at least one of {port, tls-port} is mandatory\n",
@@ -2237,6 +2238,10 @@ SRST
     ``seamless-migration=[on|off]``
         Enable/disable spice seamless migration. Default is off.
 
+    ``preferred-codec=<encoder>:<codec>``
+        Provide the preferred codec the Spice server should use.
+        Default would be spice:mjpeg.
+
     ``gl=[on|off]``
         Enable/disable OpenGL context. Default is off.
 
diff --git a/ui/spice-core.c b/ui/spice-core.c
index 72f8f1681c..6e00211e3a 100644
--- a/ui/spice-core.c
+++ b/ui/spice-core.c
@@ -469,6 +469,9 @@ static QemuOptsList qemu_spice_opts = {
         },{
             .name = "streaming-video",
             .type = QEMU_OPT_STRING,
+        },{
+            .name = "preferred-codec",
+            .type = QEMU_OPT_STRING,
         },{
             .name = "agent-mouse",
             .type = QEMU_OPT_BOOL,
@@ -644,6 +647,7 @@ static void qemu_spice_init(void)
     char *x509_key_file = NULL,
         *x509_cert_file = NULL,
         *x509_cacert_file = NULL;
+    const char *preferred_codec = NULL;
     int port, tls_port, addr_flags;
     spice_image_compression_t compression;
     spice_wan_compression_t wan_compr;
@@ -795,6 +799,16 @@ static void qemu_spice_init(void)
         spice_server_set_streaming_video(spice_server, SPICE_STREAM_VIDEO_OFF);
     }
 
+    preferred_codec = qemu_opt_get(opts, "preferred-codec");
+    if (preferred_codec) {
+        if (spice_server_set_video_codecs(spice_server, preferred_codec)) {
+            error_report("Preferred codec name is not valid");
+            exit(1);
+        }
+    } else {
+        spice_server_set_video_codecs(spice_server, "spice:mjpeg");
+    }
+
     spice_server_set_agent_mouse
         (spice_server, qemu_opt_get_bool(opts, "agent-mouse", 1));
     spice_server_set_playback_compression
-- 
2.37.2