Line data    Source code

       1             : /*
       2             :  *  Copyright (C) 2004-2024 Savoir-faire Linux Inc.
       3             :  *  Copyright (C) 2012 VLC authors and VideoLAN
       4             :  *
       5             :  *  This program is free software: you can redistribute it and/or modify
       6             :  *  it under the terms of the GNU General Public License as published by
       7             :  *  the Free Software Foundation, either version 3 of the License, or
       8             :  *  (at your option) any later version.
       9             :  *
      10             :  *  This program is distributed in the hope that it will be useful,
      11             :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      12             :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
      13             :  *  GNU General Public License for more details.
      14             :  *
      15             :  *  You should have received a copy of the GNU General Public License
      16             :  *  along with this program. If not, see <https://www.gnu.org/licenses/>.
      17             :  */
      18             : #pragma once
      19             : 
      20             : #ifdef HAVE_CONFIG_H
      21             : #include <config.h>
      22             : #endif
      23             : 
      24             : #include "media_io_handle.h"
      25             : 
      26             : #ifndef _WIN32
      27             : #include <sys/socket.h>
      28             : #include <netdb.h>
      29             : #include <poll.h>
      30             : #else
      31             : #include <winsock2.h>
      32             : #include <ws2tcpip.h>
      33             : using socklen_t = int;
      34             : #endif
      35             : 
      36             : #include <dhtnet/ip_utils.h>
      37             : #include <dhtnet/ice_socket.h>
      38             : 
      39             : #include <cstdint>
      40             : #include <mutex>
      41             : #include <memory>
      42             : #include <atomic>
      43             : #include <list>
      44             : #include <vector>
      45             : #include <condition_variable>
      46             : #include <functional>
      47             : 
      48             : namespace jami {
      49             : 
      50             : class SRTPProtoContext;
      51             : 
      52             : typedef struct
      53             : {
      54             : #ifdef WORDS_BIGENDIAN
      55             :     uint32_t version : 2; /* protocol version */
      56             :     uint32_t p : 1;       /* padding flag */
      57             :     uint32_t rc : 5;      /* reception report count must be 201 for report */
      58             : 
      59             : #else
      60             :     uint32_t rc : 5;      /* reception report count must be 201 for report */
      61             :     uint32_t p : 1;       /* padding flag */
      62             :     uint32_t version : 2; /* protocol version */
      63             : #endif
      64             :     uint32_t pt : 8;               /* payload type */
      65             :     uint32_t len : 16;             /* length of RTCP packet */
      66             :     uint32_t ssrc;                 /* synchronization source identifier of packet send */
      67             :     uint32_t id;                   /* synchronization source identifier of first source */
      68             :     uint32_t fraction_lost : 8;    /* 8 bits of fraction, 24 bits of total packets lost */
      69             :     uint32_t cum_lost_packet : 24; /* cumulative number packet lost */
      70             :     uint32_t ext_high;             /* Extended highest sequence number received */
      71             :     uint32_t jitter;               /* jitter */
      72             :     uint32_t lsr;                  /* last SR timestamp */
      73             :     uint32_t dlsr;                 /* Delay since last SR timestamp */
      74             : } rtcpRRHeader;
      75             : 
      76             : typedef struct
      77             : {
      78             : #ifdef WORDS_BIGENDIAN
      79             :     uint32_t version : 2; /* protocol version */
      80             :     uint32_t p : 1;       /* padding flag */
      81             :     uint32_t rc : 5;      /* reception report count must be 201 for report */
      82             : 
      83             : #else
      84             :     uint32_t rc : 5;      /* reception report count must be 201 for report */
      85             :     uint32_t p : 1;       /* padding flag */
      86             :     uint32_t version : 2; /* protocol version */
      87             : #endif
      88             :     uint32_t pt : 8;       /* payload type */
      89             :     uint32_t len : 16;     /* length of RTCP packet */
      90             :     uint32_t ssrc;         /* synchronization source identifier of packet send */
      91             :     uint32_t timestampMSB; /* timestamp MSB */
      92             :     uint32_t timestampLSB; /* timestamp LSB */
      93             :     uint32_t timestampRTP; /* RTP timestamp */
      94             :     uint32_t spc;          /* Sender's packet count */
      95             :     uint32_t soc;          /* Sender's octet count */
      96             : } rtcpSRHeader;
      97             : 
      98             : typedef struct
      99             : {
     100             : #ifdef WORDS_BIGENDIAN
     101             :     uint32_t version : 2; /* protocol version */
     102             :     uint32_t p : 1;       /* padding flag always 0 */
     103             :     uint32_t fmt : 5;     /* Feedback message type always 15 */
     104             : 
     105             : #else
     106             :     uint32_t fmt : 5;     /* Feedback message type always 15 */
     107             :     uint32_t p : 1;       /* padding flag always 0 */
     108             :     uint32_t version : 2; /* protocol version */
     109             : #endif
     110             :     uint32_t pt : 8;      /* payload type */
     111             :     uint32_t len : 16;    /* length of RTCP packet */
     112             :     uint32_t ssrc;        /* synchronization source identifier of packet sender */
     113             :     uint32_t ssrc_source; /* synchronization source identifier of first source alway 0*/
     114             :     uint32_t uid; /* Unique identifier Always ‘R’ ‘E’ ‘M’ ‘B’ (4 ASCII characters). */
     115             :     uint32_t n_ssrc : 8;     /* Number of SSRCs in this message. */
     116             :     uint32_t br_exp : 6;     /* BR Exp */
     117             :     uint32_t br_mantis : 18; /* BR Mantissa */
     118             :     uint32_t f_ssrc;         /* SSRC feedback */
     119             : } rtcpREMBHeader;
     120             : 
     121             : typedef struct
     122             : {
     123             :     uint64_t last_send_ts;
     124             :     std::chrono::steady_clock::time_point last_receive_ts;
     125             :     uint64_t send_ts;
     126             :     std::chrono::steady_clock::time_point receive_ts;
     127             : } TS_Frame;
     128             : 
     129             : class SocketPair
     130             : {
     131             : public:
     132             :     SocketPair(const char* uri, int localPort);
     133             :     SocketPair(std::unique_ptr<dhtnet::IceSocket> rtp_sock, std::unique_ptr<dhtnet::IceSocket> rtcp_sock);
     134             :     ~SocketPair();
     135             : 
     136             :     void interrupt();
     137             : 
     138             :     // Set the read blocking mode.
     139             :     // By default, the read operation will block until data is available
     140             :     // on the socket. This method allows to switch to unblocking mode
     141             :     // if to stop the receiver thread to exit and there is no more data
     142             :     // to read (if the peer mutes/stops the media/RTP stream).
     143             :     void setReadBlockingMode(bool blocking);
     144             : 
     145             :     MediaIOHandle* createIOContext(const uint16_t mtu);
     146             : 
     147             :     void openSockets(const char* uri, int localPort);
     148             :     void closeSockets();
     149             : 
     150             :     /*
     151             :        Supported suites are:
     152             : 
     153             :        AES_CM_128_HMAC_SHA1_80
     154             :        SRTP_AES128_CM_HMAC_SHA1_80
     155             :        AES_CM_128_HMAC_SHA1_32
     156             :        SRTP_AES128_CM_HMAC_SHA1_3
     157             : 
     158             :        Example (unsecure) usage:
     159             :        createSRTP("AES_CM_128_HMAC_SHA1_80",
     160             :                   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn",
     161             :                   "AES_CM_128_HMAC_SHA1_80",
     162             :                   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn");
     163             : 
     164             :        Will throw an std::runtime_error on failure, should be handled at a higher level
     165             :     */
     166             :     void createSRTP(const char* out_suite,
     167             :                     const char* out_params,
     168             :                     const char* in_suite,
     169             :                     const char* in_params);
     170             : 
     171             :     void stopSendOp(bool state = true);
     172             :     std::list<rtcpRRHeader> getRtcpRR();
     173             :     std::list<rtcpREMBHeader> getRtcpREMB();
     174             : 
     175             :     bool waitForRTCP(std::chrono::seconds interval);
     176             :     double getLastLatency();
     177             : 
     178         152 :     void setPacketLossCallback(std::function<void(void)> cb)
     179             :     {
     180         152 :         packetLossCallback_ = std::move(cb);
     181         152 :     }
     182             :     void setRtpDelayCallback(std::function<void(int, int)> cb);
     183             : 
     184             :     int writeData(uint8_t* buf, int buf_size);
     185             : 
     186             :     uint16_t lastSeqValOut();
     187             : 
     188             : private:
     189             :     NON_COPYABLE(SocketPair);
     190             :     using clock = std::chrono::steady_clock;
     191             :     using time_point = clock::time_point;
     192             : 
     193             :     int readCallback(uint8_t* buf, int buf_size);
     194             :     int writeCallback(uint8_t* buf, int buf_size);
     195             : 
     196             :     int waitForData();
     197             :     int readRtpData(void* buf, int buf_size);
     198             :     int readRtcpData(void* buf, int buf_size);
     199             :     void saveRtcpRRPacket(uint8_t* buf, size_t len);
     200             :     void saveRtcpREMBPacket(uint8_t* buf, size_t len);
     201             : 
     202             :     std::mutex dataBuffMutex_;
     203             :     std::condition_variable cv_;
     204             :     std::list<std::vector<uint8_t>> rtpDataBuff_;
     205             :     std::list<std::vector<uint8_t>> rtcpDataBuff_;
     206             : 
     207             :     std::unique_ptr<dhtnet::IceSocket> rtp_sock_;
     208             :     std::unique_ptr<dhtnet::IceSocket> rtcp_sock_;
     209             : 
     210             :     int rtpHandle_ {-1};
     211             :     int rtcpHandle_ {-1};
     212             :     dhtnet::IpAddr rtpDestAddr_;
     213             :     dhtnet::IpAddr rtcpDestAddr_;
     214             :     std::atomic_bool interrupted_ {false};
     215             :     // Read operations are blocking. This will allow unblocking the
     216             :     // receiver thread if the peer stops/mutes the media (RTP)
     217             :     std::atomic_bool readBlockingMode_ {false};
     218             :     std::atomic_bool noWrite_ {false};
     219             :     std::unique_ptr<SRTPProtoContext> srtpContext_;
     220             :     std::function<void(void)> packetLossCallback_;
     221             :     std::function<void(int, int)> rtpDelayCallback_;
     222             :     bool getOneWayDelayGradient(float sendTS, bool marker, int32_t* gradient, int32_t* deltaR);
     223             :     bool parse_RTP_ext(uint8_t* buf, float* abs);
     224             : 
     225             :     std::list<rtcpRRHeader> listRtcpRRHeader_;
     226             :     std::list<rtcpREMBHeader> listRtcpREMBHeader_;
     227             :     std::mutex rtcpInfo_mutex_;
     228             :     std::condition_variable cvRtcpPacketReadyToRead_;
     229             :     static constexpr unsigned MAX_LIST_SIZE {10};
     230             : 
     231             :     mutable std::atomic_bool rtcpPacketLoss_ {false};
     232             :     double lastSRTS_ {};
     233             :     uint32_t lastDLSR_ {};
     234             : 
     235             :     std::list<double> histoLatency_;
     236             : 
     237             :     time_point lastRR_time;
     238             :     uint16_t lastSeqNumIn_ {0};
     239             :     float lastSendTS_ {0.0f};
     240             :     time_point lastReceiveTS_ {};
     241             :     time_point arrival_TS {};
     242             : 
     243             :     TS_Frame svgTS = {};
     244             : };
     245             : 
     246             : } // namespace jami