hawkeye camera support(not tested)

framework/Inspectron.HawkEye/RTSP/G711Payload.cs

@@ -0,0 +1,64 @@
+using System.Collections.Generic;
+
+namespace Inspectron.HawkEye.RTSP
+{
+    // This class handles the G711 Payload
+    // It has methods to process the RTP Payload
+
+    public class G711Payload
+    {
+        // Constructor
+        public G711Payload()
+        {
+        }
+
+        public List<byte[]> Process_G711_RTP_Packet(byte[] rtp_payload, int rtp_marker) {
+            
+            List<byte[]> audio_data = new List<byte[]>();
+            audio_data.Add(rtp_payload);
+
+            return audio_data;
+        }
+
+        /* Untested - used with G711.1 and PCMA-WB and PCMU-WB Codec Names */
+        public List<byte[]> Process_G711_1_RTP_Packet(byte[] rtp_payload, int rtp_marker) {
+
+            // Look at the Header. This tells us the G711 mode being used
+
+            // Mode Index (MI) is
+            // 1 - R1 40 octets containg Layer 0 data
+            // 2 - R2a 50 octets containing Layer 0 plus Layer 1 data
+            // 3 - R2b 50 octets containing Layer 0 plus Layer 2 data
+            // 4 - R3 60 octets containing Layer 0 plus Layer 1 plus Layer 2 data
+
+            byte mode_index = (byte)(rtp_payload[0] & 0x07);
+
+            int size_of_one_frame = 0; // will be in bytes
+            switch (mode_index) {
+                case 1: size_of_one_frame = 40; break;
+                case 2: size_of_one_frame = 50; break;
+                case 3: size_of_one_frame = 50; break;
+                case 4: size_of_one_frame = 60; break;
+                default: return null; // invalid Mode Index
+            }
+
+            int number_frames = (rtp_payload.Length - 1) / size_of_one_frame;
+
+
+            // Return just the basic u-Law or A-Law audio (the Layer 0 audio)
+
+            List<byte[]> audio_data = new List<byte[]>();
+
+            // Extract each audio frame and place in the audio_data List
+            int frame_start = 1; // starts just after the MI header
+            while (frame_start + size_of_one_frame < rtp_payload.Length) {
+                byte[] layer_0_audio = new byte[40];
+                System.Array.Copy(rtp_payload,frame_start,layer_0_audio,0,40); // 40 octets in Layer 0 data
+                audio_data.Add(layer_0_audio);
+
+                frame_start += size_of_one_frame;
+            }
+            return audio_data;
+        }
+    }
+}