From fb859712f36254ca9c34773b82618a09626c8cd9 Mon Sep 17 00:00:00 2001
From: Mikhail Burakov <mburakov@mailbox.org>
Date: Sun, 11 Jun 2023 20:36:29 +0200
Subject: Introduce communication proto for video stream

---
 encode.c |  9 ++++++++-
 proto.h  | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 proto.h

diff --git a/encode.c b/encode.c
index be920d1..1c45e63 100644
--- a/encode.c
+++ b/encode.c
@@ -32,6 +32,7 @@
 #include "bitstream.h"
 #include "gpu.h"
 #include "hevc.h"
+#include "proto.h"
 #include "toolbox/utils.h"
 
 struct EncodeContext {
@@ -922,8 +923,14 @@ bool EncodeContextEncodeFrame(struct EncodeContext* encode_context, int fd) {
     abort();
   }
 
+  struct Proto proto = {
+      .size = segment->size,
+      .type = PROTO_TYPE_VIDEO,
+      .flags = idr ? PROTO_FLAG_KEYFRAME : 0,
+      .latency = 0,
+  };
   struct iovec iovec[] = {
-      {.iov_base = &segment->size, .iov_len = sizeof(segment->size)},
+      {.iov_base = &proto, .iov_len = sizeof(proto)},
       {.iov_base = segment->buf, .iov_len = segment->size},
   };
   if (!DrainBuffers(fd, iovec, LENGTH(iovec))) {
diff --git a/proto.h b/proto.h
new file mode 100644
index 0000000..c8c4d0b
--- /dev/null
+++ b/proto.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2023 Mikhail Burakov. This file is part of streamer.
+ *
+ * streamer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * streamer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with streamer.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef STREAMER_PROTO_H_
+#define STREAMER_PROTO_H_
+
+#include <assert.h>
+#include <stdint.h>
+
+#define PROTO_TYPE_MISC 0
+#define PROTO_TYPE_VIDEO 1
+#define PROTO_TYPE_AUDIO 2
+
+#define PROTO_FLAG_KEYFRAME 1
+
+struct Proto {
+  uint32_t size;
+  uint8_t type;
+  uint8_t flags;
+  uint16_t latency;
+  uint8_t data[];
+};
+
+static_assert(sizeof(struct Proto) == 8 * sizeof(uint8_t),
+              "Suspicious proto struct size");
+
+#endif  // STREAMER_PROTO_H_
-- 
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