Line data    Source code

       1             : /*
       2             :  *  Copyright (C) 2004-2024 Savoir-faire Linux Inc.
       3             :  *  Copyright (C) 2012 VLC authors and VideoLAN
       4             :  *
       5             :  *  Author: Tristan Matthews <tristan.matthews@savoirfairelinux.com>
       6             :  *
       7             :  *  This program is free software; you can redistribute it and/or modify
       8             :  *  it under the terms of the GNU General Public License as published by
       9             :  *  the Free Software Foundation; either version 3 of the License, or
      10             :  *  (at your option) any later version.
      11             :  *
      12             :  *  This program is distributed in the hope that it will be useful,
      13             :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :  *  GNU General Public License for more details.
      16             :  *
      17             :  *  You should have received a copy of the GNU General Public License
      18             :  *  along with this program; if not, write to the Free Software
      19             :  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
      20             :  */
      21             : 
      22             : #pragma once
      23             : 
      24             : #ifdef HAVE_CONFIG_H
      25             : #include <config.h>
      26             : #endif
      27             : 
      28             : #include "media_io_handle.h"
      29             : 
      30             : #ifndef _WIN32
      31             : #include <sys/socket.h>
      32             : #include <netdb.h>
      33             : #include <poll.h>
      34             : #else
      35             : #include <winsock2.h>
      36             : #include <ws2tcpip.h>
      37             : using socklen_t = int;
      38             : #endif
      39             : 
      40             : #include <dhtnet/ip_utils.h>
      41             : #include <dhtnet/ice_socket.h>
      42             : 
      43             : #include <cstdint>
      44             : #include <mutex>
      45             : #include <memory>
      46             : #include <atomic>
      47             : #include <list>
      48             : #include <vector>
      49             : #include <condition_variable>
      50             : #include <functional>
      51             : 
      52             : namespace jami {
      53             : 
      54             : class SRTPProtoContext;
      55             : 
      56             : typedef struct
      57             : {
      58             : #ifdef WORDS_BIGENDIAN
      59             :     uint32_t version : 2; /* protocol version */
      60             :     uint32_t p : 1;       /* padding flag */
      61             :     uint32_t rc : 5;      /* reception report count must be 201 for report */
      62             : 
      63             : #else
      64             :     uint32_t rc : 5;      /* reception report count must be 201 for report */
      65             :     uint32_t p : 1;       /* padding flag */
      66             :     uint32_t version : 2; /* protocol version */
      67             : #endif
      68             :     uint32_t pt : 8;               /* payload type */
      69             :     uint32_t len : 16;             /* length of RTCP packet */
      70             :     uint32_t ssrc;                 /* synchronization source identifier of packet send */
      71             :     uint32_t id;                   /* synchronization source identifier of first source */
      72             :     uint32_t fraction_lost : 8;    /* 8 bits of fraction, 24 bits of total packets lost */
      73             :     uint32_t cum_lost_packet : 24; /* cumulative number packet lost */
      74             :     uint32_t ext_high;             /* Extended highest sequence number received */
      75             :     uint32_t jitter;               /* jitter */
      76             :     uint32_t lsr;                  /* last SR timestamp */
      77             :     uint32_t dlsr;                 /* Delay since last SR timestamp */
      78             : } rtcpRRHeader;
      79             : 
      80             : typedef struct
      81             : {
      82             : #ifdef WORDS_BIGENDIAN
      83             :     uint32_t version : 2; /* protocol version */
      84             :     uint32_t p : 1;       /* padding flag */
      85             :     uint32_t rc : 5;      /* reception report count must be 201 for report */
      86             : 
      87             : #else
      88             :     uint32_t rc : 5;      /* reception report count must be 201 for report */
      89             :     uint32_t p : 1;       /* padding flag */
      90             :     uint32_t version : 2; /* protocol version */
      91             : #endif
      92             :     uint32_t pt : 8;       /* payload type */
      93             :     uint32_t len : 16;     /* length of RTCP packet */
      94             :     uint32_t ssrc;         /* synchronization source identifier of packet send */
      95             :     uint32_t timestampMSB; /* timestamp MSB */
      96             :     uint32_t timestampLSB; /* timestamp LSB */
      97             :     uint32_t timestampRTP; /* RTP timestamp */
      98             :     uint32_t spc;          /* Sender's packet count */
      99             :     uint32_t soc;          /* Sender's octet count */
     100             : } rtcpSRHeader;
     101             : 
     102             : typedef struct
     103             : {
     104             : #ifdef WORDS_BIGENDIAN
     105             :     uint32_t version : 2; /* protocol version */
     106             :     uint32_t p : 1;       /* padding flag always 0 */
     107             :     uint32_t fmt : 5;     /* Feedback message type always 15 */
     108             : 
     109             : #else
     110             :     uint32_t fmt : 5;     /* Feedback message type always 15 */
     111             :     uint32_t p : 1;       /* padding flag always 0 */
     112             :     uint32_t version : 2; /* protocol version */
     113             : #endif
     114             :     uint32_t pt : 8;      /* payload type */
     115             :     uint32_t len : 16;    /* length of RTCP packet */
     116             :     uint32_t ssrc;        /* synchronization source identifier of packet sender */
     117             :     uint32_t ssrc_source; /* synchronization source identifier of first source alway 0*/
     118             :     uint32_t uid; /* Unique identifier Always ‘R’ ‘E’ ‘M’ ‘B’ (4 ASCII characters). */
     119             :     uint32_t n_ssrc : 8;     /* Number of SSRCs in this message. */
     120             :     uint32_t br_exp : 6;     /* BR Exp */
     121             :     uint32_t br_mantis : 18; /* BR Mantissa */
     122             :     uint32_t f_ssrc;         /* SSRC feedback */
     123             : } rtcpREMBHeader;
     124             : 
     125             : typedef struct
     126             : {
     127             :     uint64_t last_send_ts;
     128             :     std::chrono::steady_clock::time_point last_receive_ts;
     129             :     uint64_t send_ts;
     130             :     std::chrono::steady_clock::time_point receive_ts;
     131             : } TS_Frame;
     132             : 
     133             : class SocketPair
     134             : {
     135             : public:
     136             :     SocketPair(const char* uri, int localPort);
     137             :     SocketPair(std::unique_ptr<dhtnet::IceSocket> rtp_sock, std::unique_ptr<dhtnet::IceSocket> rtcp_sock);
     138             :     ~SocketPair();
     139             : 
     140             :     void interrupt();
     141             : 
     142             :     // Set the read blocking mode.
     143             :     // By default, the read operation will block until data is available
     144             :     // on the socket. This method allows to switch to unblocking mode
     145             :     // if to stop the receiver thread to exit and there is no more data
     146             :     // to read (if the peer mutes/stops the media/RTP stream).
     147             :     void setReadBlockingMode(bool blocking);
     148             : 
     149             :     MediaIOHandle* createIOContext(const uint16_t mtu);
     150             : 
     151             :     void openSockets(const char* uri, int localPort);
     152             :     void closeSockets();
     153             : 
     154             :     /*
     155             :        Supported suites are:
     156             : 
     157             :        AES_CM_128_HMAC_SHA1_80
     158             :        SRTP_AES128_CM_HMAC_SHA1_80
     159             :        AES_CM_128_HMAC_SHA1_32
     160             :        SRTP_AES128_CM_HMAC_SHA1_3
     161             : 
     162             :        Example (unsecure) usage:
     163             :        createSRTP("AES_CM_128_HMAC_SHA1_80",
     164             :                   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn",
     165             :                   "AES_CM_128_HMAC_SHA1_80",
     166             :                   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn");
     167             : 
     168             :        Will throw an std::runtime_error on failure, should be handled at a higher level
     169             :     */
     170             :     void createSRTP(const char* out_suite,
     171             :                     const char* out_params,
     172             :                     const char* in_suite,
     173             :                     const char* in_params);
     174             : 
     175             :     void stopSendOp(bool state = true);
     176             :     std::list<rtcpRRHeader> getRtcpRR();
     177             :     std::list<rtcpREMBHeader> getRtcpREMB();
     178             : 
     179             :     bool waitForRTCP(std::chrono::seconds interval);
     180             :     double getLastLatency();
     181             : 
     182         151 :     void setPacketLossCallback(std::function<void(void)> cb)
     183             :     {
     184         151 :         packetLossCallback_ = std::move(cb);
     185         151 :     }
     186             :     void setRtpDelayCallback(std::function<void(int, int)> cb);
     187             : 
     188             :     int writeData(uint8_t* buf, int buf_size);
     189             : 
     190             :     uint16_t lastSeqValOut();
     191             : 
     192             : private:
     193             :     NON_COPYABLE(SocketPair);
     194             :     using clock = std::chrono::steady_clock;
     195             :     using time_point = clock::time_point;
     196             : 
     197             :     int readCallback(uint8_t* buf, int buf_size);
     198             :     int writeCallback(uint8_t* buf, int buf_size);
     199             : 
     200             :     int waitForData();
     201             :     int readRtpData(void* buf, int buf_size);
     202             :     int readRtcpData(void* buf, int buf_size);
     203             :     void saveRtcpRRPacket(uint8_t* buf, size_t len);
     204             :     void saveRtcpREMBPacket(uint8_t* buf, size_t len);
     205             : 
     206             :     std::mutex dataBuffMutex_;
     207             :     std::condition_variable cv_;
     208             :     std::list<std::vector<uint8_t>> rtpDataBuff_;
     209             :     std::list<std::vector<uint8_t>> rtcpDataBuff_;
     210             : 
     211             :     std::unique_ptr<dhtnet::IceSocket> rtp_sock_;
     212             :     std::unique_ptr<dhtnet::IceSocket> rtcp_sock_;
     213             : 
     214             :     int rtpHandle_ {-1};
     215             :     int rtcpHandle_ {-1};
     216             :     dhtnet::IpAddr rtpDestAddr_;
     217             :     dhtnet::IpAddr rtcpDestAddr_;
     218             :     std::atomic_bool interrupted_ {false};
     219             :     // Read operations are blocking. This will allow unblocking the
     220             :     // receiver thread if the peer stops/mutes the media (RTP)
     221             :     std::atomic_bool readBlockingMode_ {false};
     222             :     std::atomic_bool noWrite_ {false};
     223             :     std::unique_ptr<SRTPProtoContext> srtpContext_;
     224             :     std::function<void(void)> packetLossCallback_;
     225             :     std::function<void(int, int)> rtpDelayCallback_;
     226             :     bool getOneWayDelayGradient(float sendTS, bool marker, int32_t* gradient, int32_t* deltaR);
     227             :     bool parse_RTP_ext(uint8_t* buf, float* abs);
     228             : 
     229             :     std::list<rtcpRRHeader> listRtcpRRHeader_;
     230             :     std::list<rtcpREMBHeader> listRtcpREMBHeader_;
     231             :     std::mutex rtcpInfo_mutex_;
     232             :     std::condition_variable cvRtcpPacketReadyToRead_;
     233             :     static constexpr unsigned MAX_LIST_SIZE {10};
     234             : 
     235             :     mutable std::atomic_bool rtcpPacketLoss_ {false};
     236             :     double lastSRTS_ {};
     237             :     uint32_t lastDLSR_ {};
     238             : 
     239             :     std::list<double> histoLatency_;
     240             : 
     241             :     time_point lastRR_time;
     242             :     uint16_t lastSeqNumIn_ {0};
     243             :     float lastSendTS_ {0.0f};
     244             :     time_point lastReceiveTS_ {};
     245             :     time_point arrival_TS {};
     246             : 
     247             :     TS_Frame svgTS = {};
     248             : };
     249             : 
     250             : } // namespace jami