From 1cb6212fc6244640e75988829b7b3ab1f82aabc4 Mon Sep 17 00:00:00 2001
From: Koushik Dutta <koushd@gmail.com>
Date: Tue, 15 Apr 2025 07:53:28 -0700
Subject: [PATCH] webrtc: implement default clocks for assigned payload types

---
 common/src/sdp-utils.ts          | 12 +++++++++++-
 plugins/webrtc/package-lock.json |  4 ++--
 plugins/webrtc/package.json      |  2 +-
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/common/src/sdp-utils.ts b/common/src/sdp-utils.ts
index 445740596..e383f302f 100644
--- a/common/src/sdp-utils.ts
+++ b/common/src/sdp-utils.ts
@@ -242,12 +242,22 @@ export function parseRtpMap(mline: ReturnType<typeof parseMLine>, rtpmap: string
         }
     }
 
+    // assigned payload types do not need to provide a clock, there is a default.
+    let clock = parseInt(match?.[3]);
+    if (!clock) {
+        clock = undefined;
+        if (codec === 'pcm_mulaw' || codec === 'pcm_alaw')
+            clock = 8000;
+        else if (codec === 'pcm_s16be')
+            clock = 16000;
+    }
+
     return {
         line: rtpmap,
         codec,
         ffmpegEncoder,
         rawCodec: match?.[2],
-        clock: parseInt(match?.[3]),
+        clock,
         channels: parseInt(match?.[5]) || undefined,
         payloadType: parseInt(match?.[1]),
     }
diff --git a/plugins/webrtc/package-lock.json b/plugins/webrtc/package-lock.json
index 91da81966..d0b624fc2 100644
--- a/plugins/webrtc/package-lock.json
+++ b/plugins/webrtc/package-lock.json
@@ -1,12 +1,12 @@
 {
    "name": "@scrypted/webrtc",
-   "version": "0.2.76",
+   "version": "0.2.77",
    "lockfileVersion": 2,
    "requires": true,
    "packages": {
       "": {
          "name": "@scrypted/webrtc",
-         "version": "0.2.76",
+         "version": "0.2.77",
          "dependencies": {
             "@scrypted/common": "file:../../common",
             "@scrypted/sdk": "file:../../sdk",
diff --git a/plugins/webrtc/package.json b/plugins/webrtc/package.json
index 2a55f3d00..4d857b454 100644
--- a/plugins/webrtc/package.json
+++ b/plugins/webrtc/package.json
@@ -1,6 +1,6 @@
 {
    "name": "@scrypted/webrtc",
-   "version": "0.2.76",
+   "version": "0.2.77",
    "scripts": {
       "scrypted-setup-project": "scrypted-setup-project",
       "prescrypted-setup-project": "scrypted-package-json",