From 20d28e80a5c861a9d5f449ea911ab75b4f37ad0d Mon Sep 17 00:00:00 2001
From: Jef <jef@targetspot.com>
Date: Tue, 24 Sep 2024 14:54:57 +0200
Subject: Initial community commit

---
 Src/nsmkv/SeekTable.h | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Src/nsmkv/SeekTable.h

(limited to 'Src/nsmkv/SeekTable.h')

diff --git a/Src/nsmkv/SeekTable.h b/Src/nsmkv/SeekTable.h
new file mode 100644
index 00000000..774ddcf9
--- /dev/null
+++ b/Src/nsmkv/SeekTable.h
@@ -0,0 +1,54 @@
+#pragma once
+#include <map>
+#include <vector>
+#include "mkv_reader.h"
+
+const uint32_t mkv_metaseek_seekhead = 0x14d9b74;
+const uint32_t mkv_metaseek_seek=0xdbb;
+const uint32_t mkv_metaseek_seekid = 0x13ab;
+const uint32_t mkv_metaseek_seekposition=0x13ac;
+
+/* this represents a seek table of other nodes in EBML 
+ be careful, CuePoints (CuePoints.h) is for seeking to a certain time in the song
+the SeekTable (SeekTable.h) is for fast indexing of the mkv file structure 
+*/
+namespace nsmkv
+{
+	class SeekEntry
+	{
+	public:
+		SeekEntry()
+		{
+			id=0;
+			position=0;
+		}
+		SeekEntry(uint64_t id, uint64_t position) : id(id), position(position)
+		{
+		}
+		uint64_t id; // ID of the EBML node
+		uint64_t position;
+	};
+
+	class SeekTable
+	{
+	public:
+		void AddEntry(SeekEntry &entry, int flags=0);
+		void Dump();
+		bool GetEntry(uint64_t id, uint64_t *position);
+		bool EnumEntry(size_t i, uint64_t id, uint64_t *position);
+
+		enum // flags for AddEntry
+		{
+			ADDENTRY_SINGLE = 0x1, // if there can only be one
+			ADDENTRY_FOUND = 0x2, // pass this is you physically found the entry in the file - this takes priority over the SeekHead
+		};
+	private:
+		bool EnumEntry(size_t i, uint64_t id, SeekEntry **seek_entry);
+		typedef std::vector<SeekEntry> SeekEntries;
+		typedef std::map<uint64_t, SeekEntries*> SeekMap;
+		SeekMap seekMap;
+	};
+
+	// returns bytes read.  0 means EOF
+	uint64_t ReadSeekHead(nsmkv::MKVReader *reader, uint64_t size, nsmkv::SeekTable &seekTable);
+}
\ No newline at end of file
-- 
cgit