From 80ef8ee890949b860585331e6c73a3a71b3e5912 Mon Sep 17 00:00:00 2001
From: Joakim Ramer <jramer@me.com>
Date: Sun, 29 Jan 2023 23:57:37 +0100
Subject: [PATCH] Fixes m4b chapters only taken from first file.

---
 server/objects/mediaTypes/Book.js | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/server/objects/mediaTypes/Book.js b/server/objects/mediaTypes/Book.js
index 2e536a26..506e6ee7 100644
--- a/server/objects/mediaTypes/Book.js
+++ b/server/objects/mediaTypes/Book.js
@@ -421,9 +421,26 @@ class Book {
     }
 
     // IF first audio file has embedded chapters then use embedded chapters
-    if (includedAudioFiles[0].chapters && includedAudioFiles[0].chapters.length) {
-      Logger.debug(`[Book] setChapters: Using embedded chapters in audio file ${includedAudioFiles[0].metadata.path}`)
-      this.chapters = includedAudioFiles[0].chapters.map(c => ({ ...c }))
+    if (includedAudioFiles[0].chapters?.length) {
+      Logger.debug(`[Book] setChapters: Using embedded chapters in audio file ${includedAudioFiles[0]?.metadata?.path}`)
+      this.chapters = []
+      let currChapterId = 0
+      let currStartTime = 0
+
+      includedAudioFiles.forEach((file) => {
+        if (file.duration) {
+          let chapters = file.chapters?.map((c) => ({
+            ...c,
+            id: c.id + currChapterId,
+            start: c.start + currStartTime,
+            end: c.end + currStartTime,
+          }))
+          this.chapters = this.chapters.concat(chapters)
+
+          currChapterId += file.chapters?.length ?? 0
+          currStartTime += file.duration
+        }
+      })
     } else if (includedAudioFiles.length > 1) {
       // Build chapters from audio files
       this.chapters = []
@@ -461,4 +478,4 @@ class Book {
     return this.metadata.authorName
   }
 }
-module.exports = Book
\ No newline at end of file
+module.exports = Book