From 85c6c916541968f298badb391b718cdf6d81d332 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sat, 19 Jun 2021 13:13:59 +0200
Subject: Support youtube description chapters

---
 src/plugins/Youtube.cpp | 52 ++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

(limited to 'src/plugins/Youtube.cpp')

diff --git a/src/plugins/Youtube.cpp b/src/plugins/Youtube.cpp
index a8c58cb..b45b5fe 100644
--- a/src/plugins/Youtube.cpp
+++ b/src/plugins/Youtube.cpp
@@ -5,6 +5,7 @@
 #include "../../include/StringUtils.hpp"
 #include "../../include/Scale.hpp"
 #include "../../include/Notification.hpp"
+#include "../../include/VideoPlayer.hpp"
 #include "../../include/Utils.hpp"
 #include <json/reader.h>
 extern "C" {
@@ -2019,7 +2020,49 @@ R"END(
         return chosen_audio_format->base.url;
     }
 
-    PluginResult YoutubeVideoPage::load(std::string &title, std::string &channel_url) {
+    // Returns -1 if timestamp is in an invalid format
+    static int youtube_comment_timestamp_to_seconds(const char *str, size_t size) {
+        if(size > 30)
+            return -1;
+
+        char timestamp[32];
+        memcpy(timestamp, str, size);
+        timestamp[size] = '\0';
+
+        int hours = 0;
+        int minutes = 0;
+        int seconds = 0;
+        if(sscanf(timestamp, "%d:%d:%d", &hours, &minutes, &seconds) == 3)
+            return (hours * 60 * 60) + (minutes * 60) + seconds;
+        if(sscanf(timestamp, "%d:%d", &minutes, &seconds) == 2)
+            return (minutes * 60) + seconds;
+        if(sscanf(timestamp, "%d", &seconds) == 1)
+            return seconds;
+        return -1;
+    }
+
+    static std::vector<MediaChapter> youtube_description_extract_chapters(const std::string &description) {
+        std::vector<MediaChapter> result;
+        string_split(description, '\n', [&result](const char *str, size_t size) {
+            const void *first_space_p = memchr(str, ' ', size);
+            if(!first_space_p)
+                return true;
+
+            int timestamp_seconds = youtube_comment_timestamp_to_seconds(str, (const char*)first_space_p - str);
+            if(timestamp_seconds == -1)
+                return true;
+
+            MediaChapter chapter;
+            chapter.start_seconds = timestamp_seconds;
+            chapter.title.assign((const char*)first_space_p, (str + size) - (const char*)first_space_p);
+            chapter.title = strip(chapter.title);
+            result.push_back(std::move(chapter));
+            return true;
+        });
+        return result;
+    }
+
+    PluginResult YoutubeVideoPage::load(std::string &title, std::string &channel_url, std::vector<MediaChapter> &chapters) {
         hls_manifest_url.clear();
         video_formats.clear();
         audio_formats.clear();
@@ -2084,6 +2127,13 @@ R"END(
             const Json::Value &channel_id_json = video_details_json["channelId"];
             if(channel_id_json.isString())
                 channel_url = "https://www.youtube.com/channel/" + channel_id_json.asString();
+
+            const Json::Value &description_json = video_details_json["shortDescription"];
+            if(description_json.isString()) {
+                std::string description = description_json.asString();
+                string_replace_all(description, '+', ' ');
+                chapters = youtube_description_extract_chapters(description);
+            }
         }
 
         const Json::Value &playback_tracing_json = json_root["playbackTracking"];
-- 
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