Add h264 and opus streaming support to libdatachannel

include/rtc/opusrtppacketizer.hpp

@@ -0,0 +1,51 @@
+/*
+ * libdatachannel streamer example
+ * Copyright (c) 2020 Filip Klembara (in2core)
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef OpusRTPPacketizer_hpp
+#define OpusRTPPacketizer_hpp
+
+#include "rtppacketizer.hpp"
+
+#if RTC_ENABLE_MEDIA
+
+namespace rtc {
+
+/// RTP packetizer for opus
+class OpusRTPPacketizer: public rtc::RTPPacketizer {
+
+public:
+    /// default clock rate used in opus RTP communication
+    static const uint32_t defaultClockRate = 48 * 1000;
+
+    /// Constructs opus packetizer with given RTP configuration.
+    /// @note RTP configuration is used in packetization process which may change some configuration properties such as sequence number.
+    /// @param rtpConfig  RTP configuration
+    OpusRTPPacketizer(std::shared_ptr<rtc::RTPPacketizationConfig> rtpConfig);
+
+    /// Creates RTP packet for given payload based on `rtpConfig`.
+    /// @note This function increase sequence number after packetization.
+    /// @param payload RTP payload
+    /// @param setMark This needs to be `false` for all RTP packets with opus payload
+    rtc::message_ptr packetize(rtc::binary payload, bool setMark) override;
+};
+
+} // namespace
+
+#endif /* RTC_ENABLE_MEDIA */
+
+#endif /* OpusRTPPacketizer_hpp */