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Fix #2415, refine dtls fragment and rtp payload size (#2652)

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ChenGH 2021-10-07 21:05:30 +08:00 • committed by GitHub
parent 0093a54b34
commit 7a4de9ffe7
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2 changed files with 11 additions and 3 deletions
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8
trunk/src/app/srs_app_rtc_dtls.cpp
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@ -25,6 +25,10 @@ using namespace std;
#include <openssl/ssl.h>
#include <openssl/err.h>
// to avoid dtls negotiate failed, set max fragment size 1200.
// @see https://github.com/ossrs/srs/issues/2415
const int DTLS_FRAGMENT_MAX_SIZE = 1200;
// Defined in HTTP/HTTPS client.
extern int srs_verify_callback(int preverify_ok, X509_STORE_CTX *ctx);
@ -439,7 +443,7 @@ srs_error_t SrsDtlsImpl::initialize(std::string version, std::string role)
// set dtls fragment
// @see https://stackoverflow.com/questions/62413602/openssl-server-packets-get-fragmented-into-270-bytes-per-packet
SSL_set_options(dtls, SSL_OP_NO_QUERY_MTU);
SSL_set_mtu(dtls, kRtpPacketSize);
SSL_set_mtu(dtls, DTLS_FRAGMENT_MAX_SIZE);
// @see https://linux.die.net/man/3/openssl_version_number
// MM NN FF PP S
@ -699,7 +703,7 @@ srs_error_t SrsDtlsClientImpl::initialize(std::string version, std::string role)
// Dtls setup active, as client role.
SSL_set_connect_state(dtls);
SSL_set_max_send_fragment(dtls, kRtpPacketSize);
SSL_set_max_send_fragment(dtls, DTLS_FRAGMENT_MAX_SIZE);
return err;
}

6
trunk/src/app/srs_app_rtc_source.cpp
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@ -64,7 +64,11 @@ const int kVideoSamplerate = 90000;
// kRtpPacketSize = kRtpMaxPayloadSize + paddings
// For example, if kRtpPacketSize is 1500, recommend to set kRtpMaxPayloadSize to 1400,
// which reserves 100 bytes for SRTP or paddings.
const int kRtpMaxPayloadSize = kRtpPacketSize - 200;
// otherwise, the kRtpPacketSize must less than MTU, in webrtc source code,
// the rtp max size is assigned by kVideoMtu = 1200.
// so we set kRtpMaxPayloadSize = 1200.
// see @doc https://groups.google.com/g/discuss-webrtc/c/gH5ysR3SoZI
const int kRtpMaxPayloadSize = kRtpPacketSize - 300;
using namespace std;