From b6071e227819f54943933ed7a4ec0eaa4934ba4e Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Wed, 26 Mar 2014 18:22:37 +0100
Subject: Change ZMQ input message format

---
 src/InputReader.h         |  4 +--
 src/InputZeroMQReader.cpp | 82 ++++++++++++++++++++++++++++++++++++-----------
 2 files changed, 65 insertions(+), 21 deletions(-)

(limited to 'src')

diff --git a/src/InputReader.h b/src/InputReader.h
index 6a7d7c3..164c5ac 100644
--- a/src/InputReader.h
+++ b/src/InputReader.h
@@ -135,7 +135,7 @@ class InputFileReader : public InputReader
 
 struct InputZeroMQThreadData
 {
-    ThreadsafeQueue<zmq::message_t*> *in_messages;
+    ThreadsafeQueue<uint8_t*> *in_messages;
     std::string uri;
 };
 
@@ -191,7 +191,7 @@ class InputZeroMQReader : public InputReader
         std::string uri_;
 
         InputZeroMQWorker worker_;
-        ThreadsafeQueue<zmq::message_t*> in_messages_;
+        ThreadsafeQueue<uint8_t*> in_messages_;
         struct InputZeroMQThreadData workerdata_;
 };
 
diff --git a/src/InputZeroMQReader.cpp b/src/InputZeroMQReader.cpp
index 52f651b..cf3f7aa 100644
--- a/src/InputZeroMQReader.cpp
+++ b/src/InputZeroMQReader.cpp
@@ -41,6 +41,27 @@
 
 #define MAX_QUEUE_SIZE 50
 
+#define NUM_FRAMES_PER_ZMQ_MESSAGE 4
+/* A concatenation of four ETI frames,
+ * whose maximal size is 6144.
+ *
+ * Four frames in one zmq message are sent, so that
+ * we do not risk breaking ETI vs. transmission frame
+ * phase.
+ *
+ * The frames are concatenated in buf, and
+ * their sizes is given in the buflen array.
+ *
+ * Most of the time, the buf will not be completely
+ * filled
+ */
+struct zmq_dab_message_t
+{
+    uint32_t version;
+    uint16_t buflen[NUM_FRAMES_PER_ZMQ_MESSAGE];
+    uint8_t  buf[NUM_FRAMES_PER_ZMQ_MESSAGE*6144];
+};
+
 int InputZeroMQReader::Open(std::string uri)
 {
     uri_ = uri;
@@ -53,27 +74,16 @@ int InputZeroMQReader::Open(std::string uri)
 
 int InputZeroMQReader::GetNextFrame(void* buffer)
 {
-    zmq::message_t* incoming;
-    in_messages_.wait_and_pop(incoming);
-
-    size_t framesize = incoming->size();
+    const size_t framesize = 6144;
 
-    // guarantee that we never will write more than 6144 bytes
-    if (framesize > 6144) {
-        fprintf(stderr, "ZeroMQ message too large: %zu!\n", framesize);
-        logger_.level(error) << "ZeroMQ message too large" << framesize;
-        return -1;
-    }
+    uint8_t* incoming;
+    in_messages_.wait_and_pop(incoming);
 
-    memcpy(buffer, incoming->data(), framesize);
+    memcpy(buffer, incoming, framesize);
 
     delete incoming;
 
-    // pad to 6144 bytes
-    memset(&((uint8_t*)buffer)[framesize], 0x55, 6144 - framesize);
-
-
-    return 6144;
+    return framesize;
 }
 
 void InputZeroMQReader::PrintInfo()
@@ -118,9 +128,43 @@ void InputZeroMQWorker::RecvProcess(struct InputZeroMQThreadData* workerdata)
                     buffer_full = false;
                 }
 
-                zmq::message_t* holder = new zmq::message_t();
-                holder->move(&incoming); // move the message into the holder
-                queue_size = workerdata->in_messages->push(holder);
+                zmq_dab_message_t* dab_msg = (zmq_dab_message_t*)incoming.data();
+
+                if (dab_msg->version != 1) {
+                    fprintf(stderr, "ZeroMQ input: wrong packet version %d\n",
+                            dab_msg->version);
+                }
+
+                int offset = sizeof(dab_msg->version) +
+                    NUM_FRAMES_PER_ZMQ_MESSAGE * sizeof(*dab_msg->buflen);
+
+                for (int i = 0; i < NUM_FRAMES_PER_ZMQ_MESSAGE; i++)
+                {
+                    if (dab_msg->buflen[i] <= 0 ||
+                        dab_msg->buflen[i] > 6144)
+                    {
+                        fprintf(stderr, "ZeroMQ buffer %d: invalid length %d\n",
+                                i, dab_msg->buflen[i]);
+                        // TODO error handling
+                    }
+                    else {
+                        uint8_t* buf = new uint8_t[6144];
+
+                        const int framesize = dab_msg->buflen[i];
+
+                        memcpy(buf,
+                                ((uint8_t*)incoming.data()) + offset,
+                                framesize);
+
+                        // pad to 6144 bytes
+                        memset(&((uint8_t*)buf)[framesize],
+                                0x55, 6144 - framesize);
+
+                        offset += framesize;
+
+                        queue_size = workerdata->in_messages->push(buf);
+                    }
+                }
             }
             else {
                 workerdata->in_messages->notify();
-- 
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