[RFC/POC PATCH spice-streaming-agent 04/16] Send a StreamInfo message when starting to stream

[Lukáš Hrázký <lhrazky@xxxxxxxxxx>]

The StreamInfo message contanis information about the new stream, e.g.
the guest (xrandr) output ID of the monitor that is being streamed.
---
 configure.ac                  |  2 +-
 src/spice-streaming-agent.cpp | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index d8af9a1..c78e54a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,7 +30,7 @@ PKG_PROG_PKG_CONFIG
 dnl =========================================================================
 dnl Check deps
 
-SPICE_PROTOCOL_MIN_VER=0.12.14
+SPICE_PROTOCOL_MIN_VER=0.12.15
 PKG_CHECK_MODULES([SPICE_PROTOCOL], [spice-protocol >= $SPICE_PROTOCOL_MIN_VER])
 AC_SUBST([SPICE_PROTOCOL_MIN_VER])
 
diff --git a/src/spice-streaming-agent.cpp b/src/spice-streaming-agent.cpp
index 1121f35..667f2d6 100644
--- a/src/spice-streaming-agent.cpp
+++ b/src/spice-streaming-agent.cpp
@@ -55,6 +55,12 @@ struct SpiceStreamDataMessage
     StreamMsgData msg;
 };
 
+struct SpiceStreamInfoMessage
+{
+    StreamDevHeader hdr;
+    StreamMsgInfo msg;
+};
+
 static bool streaming_requested = false;
 static bool quit_requested = false;
 static bool log_binary = false;
@@ -204,6 +210,20 @@ static void spice_stream_send_format(StreamPort &stream_port, unsigned w, unsign
     stream_port.write(&msg, msgsize);
 }
 
+static void spice_stream_send_info(StreamPort &stream_port, uint32_t output_id)
+{
+    SpiceStreamInfoMessage msg;
+    const size_t msgsize = sizeof(msg);
+    const size_t hdrsize  = sizeof(msg.hdr);
+    memset(&msg, 0, msgsize);
+    msg.hdr.protocol_version = STREAM_DEVICE_PROTOCOL;
+    msg.hdr.type = STREAM_TYPE_INFO;
+    msg.hdr.size = msgsize - hdrsize;
+    msg.msg.output_id = output_id;
+    syslog(LOG_DEBUG, "writing stream info\n");
+    stream_port.write(&msg, msgsize);
+}
+
 static void spice_stream_send_frame(StreamPort &stream_port, const void *buf, const unsigned size)
 {
     SpiceStreamDataMessage msg;
@@ -387,6 +407,8 @@ do_capture(StreamPort &stream_port, FILE *f_log)
                 syslog(LOG_DEBUG, "wXh %uX%u  codec=%u\n", width, height, codec);
                 STAT_LOG("Started new stream wXh %uX%u  codec=%u", width, height, codec);
 
+                // TODO use xrandr to get the output id, hard-coded 1 is ok until multimonitor support
+                spice_stream_send_info(stream_port, 1);
                 spice_stream_send_format(stream_port, width, height, codec);
             }
             STAT_LOG("Frame of %zu bytes:", frame.buffer_size);
-- 
2.17.1

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