From 772b317648e206af6b057abd5b1e6e7f10e2dee4 Mon Sep 17 00:00:00 2001
From: Klaas de Waal <klaas@kldo.nl>
Date: Sun, 1 Dec 2024 16:20:39 +0100
Subject: [PATCH] ChannelUtil function GetChannelNumber

Add function GetChannelNumber to retrieve the channel number
for a given video source ID and the channel name.
The channel name is truncated to the first 64 characters because
that is the length of the name field in table channel.
---
 mythtv/libs/libmythtv/channelutil.cpp | 23 +++++++++++++++++++++++
 mythtv/libs/libmythtv/channelutil.h   |  3 +++
 2 files changed, 26 insertions(+)

diff --git a/mythtv/libs/libmythtv/channelutil.cpp b/mythtv/libs/libmythtv/channelutil.cpp
index 06024846b20..d5a6d9aad8c 100644
--- a/mythtv/libs/libmythtv/channelutil.cpp
+++ b/mythtv/libs/libmythtv/channelutil.cpp
@@ -988,6 +988,29 @@ int ChannelUtil::GetChannelValueInt(const QString &channel_field,
     return (retval) ? retval : -1;
 }
 
+QString ChannelUtil::GetChannelNumber(uint sourceid, const QString &channel_name)
+{
+    if (channel_name.isEmpty())
+        return {};
+
+    MSqlQuery query(MSqlQuery::InitCon());
+    query.prepare("SELECT channum FROM channel WHERE sourceid = :SOURCEID "
+                  "AND name = :NAME "
+                  "AND deleted IS NULL;" );
+    query.bindValue(":SOURCEID", sourceid);
+    query.bindValue(":NAME", channel_name.left(64));    // Field channel.name is 64 characters
+    if (!query.exec())
+    {
+        MythDB::DBError("GetChannelNumber", query);
+        return {};
+    }
+
+    if (!query.next())
+        return {};
+
+    return query.value(0).toString();
+}
+
 bool ChannelUtil::IsOnSameMultiplex(uint srcid,
                                     const QString &new_channum,
                                     const QString &old_channum)
diff --git a/mythtv/libs/libmythtv/channelutil.h b/mythtv/libs/libmythtv/channelutil.h
index 95b11725112..066e380eef4 100644
--- a/mythtv/libs/libmythtv/channelutil.h
+++ b/mythtv/libs/libmythtv/channelutil.h
@@ -289,6 +289,9 @@ class MTV_PUBLIC ChannelUtil
                                       uint           sourceid,
                                       const QString &channum);
 
+    static QString GetChannelNumber(uint           sourceid,
+                                    const QString &channel_name);
+
     static bool    IsOnSameMultiplex(uint srcid,
                                      const QString &new_channum,
                                      const QString &old_channum);