This protocol allows a guest to send a video stream to the server.
Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
spice/Makefile.am | 1 +
spice/stream-device.h | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 129 insertions(+)
create mode 100644 spice/stream-device.h
diff --git a/spice/Makefile.am b/spice/Makefile.am
index a54ae89..4f9a607 100644
--- a/spice/Makefile.am
+++ b/spice/Makefile.am
@@ -19,6 +19,7 @@ spice_protocol_include_HEADERS = \
types.h \
vd_agent.h \
vdi_dev.h \
+ stream-device.h \
$(NULL)
-include $(top_srcdir)/git.mk
diff --git a/spice/stream-device.h b/spice/stream-device.h
new file mode 100644
index 0000000..427095b
--- /dev/null
+++ b/spice/stream-device.h
@@ -0,0 +1,128 @@
+/*
+ Copyright (C) 2017 Red Hat, Inc.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of the copyright holder nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS
+ IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*
+ * This header contains definition for the device that
+ * allows to send streamed data to the server.
+ *
+ * The device is currently implemented as a VirtIO port inside the
+ * guest. The guest should open that device to use this protocol to
+ * communicate with the host.
+ * The name of the port is "com.redhat.stream.0".
+ */
+
+#ifndef SPICE_STREAM_DEVICE_H_
+#define SPICE_STREAM_DEVICE_H_
+
+#include <spice/types.h>
+
+/*
+ * Structures are all "naturally aligned"
+ * containing integers up to 64 bit.
+ * All numbers are in little endian format.
+ *
+ * The protocol can be defined by these states:
+ * - Initial. Device just opened. Guest should wait
+ * for a message from the host;
+ * - Idle. No streaming allowed;
+ * - Ready. Server sent list of possible codecs;
+ * - Streaming. Stream active, enabled by the guest.
+ */
+
+/* version of the protocol */
+#define STREAM_DEVICE_PROTOCOL 1
+
+typedef struct StreamDevHeader {
+ /* should be STREAM_DEVICE_PROTOCOL */
+ uint8_t protocol_version;
+ /* reserved, should be set to 0 */
+ uint8_t padding;
+ /* as defined in StreamMsgType enumeration */
+ uint16_t type;
+ /* size of the following message.
+ * A message of type STREAM_TYPE_XXX_YYY is represented with a
+ * corresponding StreamMsgXxxYyy structure. */
+ uint32_t size;
+} StreamDevHeader;
+
+typedef enum StreamMsgType {
+ /* invalid, do not use */
+ STREAM_TYPE_INVALID = 0,
+ /* allows to send version information */
+ STREAM_TYPE_CAPABILITIES,
+ /* send screen resolution */
+ STREAM_TYPE_FORMAT,
+ /* stream data */
+ STREAM_TYPE_DATA,
+} StreamMsgType;
+
+/* Generic extension capabilities.
+ * This is a set of bits to specify which capabilities host and guest support.
+ * This message is sent by the host to the guest or by the guest to the host.
+ * Should be sent as first message.
+ * If it is not sent, it means that guest/host doesn't support any extension.
+ * Guest should send this as a reply from same type of message
+ * from the host.
+ * This message should be limited to 1024 bytes. This allows
+ * plenty of negotiations.
+ *
+ * States allowed: Initial(host), Idle(guest)
+ * state will change to Idle.
+ */
+typedef struct StreamMsgCapabilities {
+ uint8_t capabilities[0];
+} StreamMsgCapabilities;
+
+/* Define the format of the stream, start a new stream.
+ * This message is sent by the guest to the host to
+ * tell the host the new stream format.
+ *
+ * States allowed: Ready
+ * state will change to Streaming.
+ */
+typedef struct StreamMsgFormat {
+ /* screen resolution/stream size */
+ uint32_t width;
+ uint32_t height;
+ /* as defined in SpiceVideoCodecType enumeration */
+ uint8_t codec;
+ uint8_t padding1[3];
+} StreamMsgFormat;
+
+/* This message contains just raw data stream.
+ * This message is sent by the guest to the host.
+ *
+ * States allowed: Streaming
+ */
+typedef struct StreamMsgData {
+ uint8_t data[0];
+} StreamMsgData;
+
+#endif /* SPICE_STREAM_DEVICE_H_ */
--
2.13.5
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