Add edi time and utco as ZMQ metadata

Since ODR-DabMod doesn't check the zmq message length, it will accept
additional metadata at the end of the ETI data

1 files changed, 79 insertions, 0 deletions

diff --git a/src/dabOutput/metadata.h b/src/dabOutput/metadata.h
new file mode 100644
index 0000000..e250938
--- /dev/null
+++ b/src/dabOutput/metadata.h
@@ -0,0 +1,79 @@
+/*
+   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Her Majesty the Queen in
+   Right of Canada (Communications Research Center Canada)
+
+   Copyright (C) 2017
+   Matthias P. Braendli, matthias.braendli@mpb.li
+
+    http://www.opendigitalradio.org
+
+   The metadata support for the outputs.
+*/
+/*
+   This file is part of ODR-DabMux.
+
+   ODR-DabMux 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.
+
+   ODR-DabMux 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 ODR-DabMux.  If not, see <http://www.gnu.org/licenses/>.
+   */
+
+#pragma once
+#include "Log.h"
+
+/* Some outputs support additional metadata to be carried
+ * next to the main ETI stream. This metadata always has the
+ * following format:
+ *   Field:  | id | len      | value               |
+ *   Length:   1    2          depending on id
+ *
+ * Multi-byte values are transmitted in network byte order.
+ */
+
+enum class output_metadata_id_e {
+    // TAI-UTC offset, value is int16_t.
+    utc_offset = 1,
+
+    /* EDI Time is the number of SI seconds since 2000-01-01 T 00:00:00 UTC.
+     * value is an uint32_t */
+    edi_time = 2,
+};
+
+struct OutputMetadata {
+    virtual output_metadata_id_e getId(void) const = 0;
+    virtual size_t getLength(void) const = 0;
+
+    /* Write the value in the metadata format to the buffer.
+     * Returns number of bytes written. The buffer buf needs
+     * to be large enough to contain the value;
+     */
+    virtual size_t write(uint8_t *buf) = 0;
+};
+
+struct OutputMetadataUTCO : public OutputMetadata {
+    explicit OutputMetadataUTCO(int16_t utco) : utco(utco) {}
+    output_metadata_id_e getId(void) const { return output_metadata_id_e::utc_offset; }
+    virtual size_t getLength(void) const { return 5; }
+    virtual size_t write(uint8_t *buf);
+
+    int16_t utco;
+};
+
+struct OutputMetadataEDITime : public OutputMetadata {
+    explicit OutputMetadataEDITime(uint32_t seconds) : seconds(seconds) {}
+    output_metadata_id_e getId(void) const { return output_metadata_id_e::edi_time; }
+    virtual size_t getLength(void) const { return 7; }
+    virtual size_t write(uint8_t *buf);
+
+    uint32_t seconds;
+
+};
+