Add h264 and opus streaming support to libdatachannel

include/rtc/h264packetizationhandler.hpp

@@ -0,0 +1,72 @@
+/*
+ * libdatachannel client 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 H264PacketizationHandler_hpp
+#define H264PacketizationHandler_hpp
+
+#include "rtcp.hpp"
+#include "h264rtppacketizer.hpp"
+#include "rtcpsenderreportable.hpp"
+#include "nalunit.hpp"
+
+#if RTC_ENABLE_MEDIA
+
+namespace rtc {
+
+/// Handler for H264 packetization
+class H264PacketizationHandler: public RtcpHandler, public RTCPSenderReportable {
+    /// RTP packetizer for H264
+    const std::shared_ptr<H264RTPPacketizer> packetizer;
+
+    const uint16_t maximumFragmentSize;
+
+    std::shared_ptr<NalUnits> splitMessage(message_ptr message);
+public:
+    /// Nalunit separator
+    enum class Separator {
+        LongStartSequence,  // 0x00, 0x00, 0x00, 0x01
+        ShortStartSequence, // 0x00, 0x00, 0x01
+        StartSequence,      // LongStartSequence or ShortStartSequence
+        Length              // first 4 bytes is nal unit length
+    };
+
+    /// Construct handler for H264 packetization.
+    /// @param separator Nal units separator
+    /// @param packetizer RTP packetizer for h264
+    H264PacketizationHandler(Separator separator, std::shared_ptr<H264RTPPacketizer> packetizer, uint16_t maximumFragmentSize = NalUnits::defaultMaximumFragmentSize);
+
+    /// Returns message unchanged
+    /// @param ptr message
+    message_ptr incoming(message_ptr ptr) override;
+
+    /// Returns packetized message if message type is binary
+    /// @note NAL units in `ptr` message must be separated by `separator` given in constructor
+    /// @note If message generates multiple rtp packets, all but last are send using `outgoingCallback`. It is your responsibility to send last packet.
+    /// @param ptr message containing all NAL units for current timestamp (one sample)
+    /// @return last packet
+    message_ptr outgoing(message_ptr ptr) override;
+private:
+    /// Separator
+    const Separator separator;
+};
+
+} // namespace
+
+#endif /* RTC_ENABLE_MEDIA */
+
+#endif /* H264PacketizationHandler_hpp */