From 9aaf3ce2ff2ca8c234eb7177afbc3a551b97a856 Mon Sep 17 00:00:00 2001
From: Xiaofeng Wang <1237906+wasphin@users.noreply.github.com>
Date: Wed, 10 Nov 2021 14:45:37 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=85=88=E4=BD=BF=E7=94=A8=E9=9D=99?=
 =?UTF-8?q?=E6=80=81=20payload=20type=20=E5=80=BC=20(#1206)?=
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---
 src/Extension/G711.cpp | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/Extension/G711.cpp b/src/Extension/G711.cpp
index eab141ce..c883a973 100644
--- a/src/Extension/G711.cpp
+++ b/src/Extension/G711.cpp
@@ -58,7 +58,18 @@ Sdp::Ptr G711Track::getSdp() {
         WarnL << getCodecName() << " Track未准备好";
         return nullptr;
     }
-    return std::make_shared<G711Sdp>(getCodecId(), getAudioSampleRate(), getAudioChannel(), getBitRate() / 1024);
+
+    const auto codec = getCodecId();
+    const auto sample_rate = getAudioSampleRate();
+    const auto audio_channel = getAudioChannel();
+    const auto bitrate = getBitRate() >> 10;
+    auto payload_type = 98;
+    if (sample_rate == 8000 && audio_channel == 1) {
+        // https://datatracker.ietf.org/doc/html/rfc3551#section-6
+        payload_type = (codec == CodecG711U) ? Rtsp::PT_PCMU : Rtsp::PT_PCMA;
+    }
+
+    return std::make_shared<G711Sdp>(codec, sample_rate, audio_channel, bitrate, payload_type);
 }
 
 }//namespace mediakit