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2
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1 /* rtp.h
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2 *
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3 * Copyright (C) DFS Deutsche Flugsicherung (2004, 2005).
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4 * All Rights Reserved.
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5 * Author: Andre Adrian
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6 *
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7 * subset of Real Time Protocol Version 2 (RFC3550 and RFC3551)
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8 * handling of extension and padding is missing
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9 *
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10 * Version 0.3.5
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11 */
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12
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13 class RTP {
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14 /* Format in Host Byte order. Conversion with htonl() to Network Byte
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15 * order. This data structure is implementation dependent!
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16 * Tested with GCC and x86 */
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17
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18 /* first 32bits */
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19 unsigned long sequence:16;
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20 unsigned long payload_type:7;
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21 unsigned long marker:1;
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22 unsigned long csrc_count:4;
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23 unsigned long extension:1;
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24 unsigned long padding:1;
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25 unsigned long version:2;
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26
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27 /* second 32bits */
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28 unsigned long timestamp;
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29
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30 /* third 32bits */
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31 unsigned long ssrc; /* used as unique identifier */
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32
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33 /* optional - used with telephone conference */
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34 unsigned long csrc[15];
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35
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36 public:
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3
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37 RTP();
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38 void init(int payload_type_, unsigned long ssrc_);
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39 int add_csrc(unsigned long csrc_);
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40 void reset_csrc();
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41 int find_csrc(unsigned long ssrc_);
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42 void next(int frameduration);
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43 int check();
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44 unsigned long getssrc() {
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2
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45 return ssrc;
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46 };
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3
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47 int get_pt() {
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2
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48 return (int) payload_type;
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49 };
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3
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50 int get_cc() {
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2
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51 return (int) csrc_count;
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52 }
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53 };
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54
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55 const unsigned PT_PCMU = 0; // 8000 sample/second, G.711 u-Law
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56 const unsigned PT_GSM = 3; // 8000 sample/second, GSM
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57 const unsigned PT_PCMA = 8; // 8000 sample/second, G.711 A-Law
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58 const unsigned PT_G729 = 18; // 8000 sample/second, G.729
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59 const unsigned PT_EFR = 97; // inofficial type GSM-EFR
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60 const unsigned PT_iLBC = 98; // inofficial type iLBC 20ms
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61 const unsigned PT_G726 = 99; // inofficial type G.726 32kbps
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62 const unsigned PT_SPX = 101; // inofficial type Wideband Speex
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63
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64 // Speex Wideband kbps/Bytes: 16.8/42, 20.6/52, 23.8/60, 27.8/70,
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65 // 34.2/86, 42.2/106
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66 const int SPX_BITRATE = 27800;
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67 const int SPX_COMPLEXITY = 3;
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68 const int SPX_QUALITY = 8;
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69 const int SPX_ENH = 1;
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70
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71 #define SZ_PCMA 160
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72 #define SZ_PCMU 160
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73 #define SZ_G726 80
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74 #define SZ_GSM 33
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75 #define SZ_EFR 31
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76 #define SZ_SPX 70
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77 #define SZ_iLBC 38
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78
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79 char *RTP_network_copy(char *to, RTP * from);
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80 char *RTP_host_copy(RTP * to, char *from);
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81 unsigned long random32(int type);
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