[spice-common v1] protocol: add preferred video codec message

[Victor Toso <victortoso@xxxxxxxxxx>]

From: Victor Toso <me@xxxxxxxxxxxxxx>

Client might want to choose a preferred video codec for streaming for
different reasons which having hardware decoder support being the most
interest one.

This message allows the client to send a combination of video codec
type with a ranking value of SpiceVideoCodecRank.

Signed-off-by: Victor Toso <victortoso@xxxxxxxxxx>
---
 common/messages.h | 10 ++++++++++
 spice.proto       | 18 ++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/common/messages.h b/common/messages.h
index 516a345..7bc90fd 100644
--- a/common/messages.h
+++ b/common/messages.h
@@ -648,6 +648,16 @@ typedef struct SpiceMsgcDisplayPreferredCompression {
     uint8_t image_compression;
 } SpiceMsgcDisplayPreferredCompression;
 
+typedef struct SpiceVideoCodecPreferredRank {
+    uint8_t type;
+    uint8_t rank;
+} SpiceVideoCodecPreferredRank;
+
+typedef struct SpiceMsgcDisplayPreferredVideoCodecType {
+    uint32_t num_of_codecs;
+    SpiceVideoCodecPreferredRank codec_ranks[0];
+} SpiceMsgcDisplayPreferredVideoCodecType;
+
 typedef struct SpiceMsgDisplayGlScanoutUnix {
     int drm_dma_buf_fd;
     uint32_t width;
diff --git a/spice.proto b/spice.proto
index 0bfc515..c4f1a62 100644
--- a/spice.proto
+++ b/spice.proto
@@ -706,6 +706,19 @@ flags32 gl_scanout_flags {
     Y0TOP
 };
 
+enum8 video_codec_rank {
+    DISABLED = 0,
+    SOFTWARE_DECODER,
+    HARDWARE_DECODER,
+    BOTH,
+    PREFERRED,
+};
+
+struct VideoCodecPreferredRank {
+    video_codec_type type;
+    video_codec_rank rank;
+};
+
 channel DisplayChannel : BaseChannel {
  server:
     message {
@@ -984,6 +997,11 @@ channel DisplayChannel : BaseChannel {
     } preferred_compression;
 
     message {
+        uint32 num_of_codecs;
+        VideoCodecPreferredRank codec_ranks[num_of_codecs] @end;
+    } preferred_video_codec_type;
+
+    message {
     } gl_draw_done;
 };
 
-- 
2.9.3

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