Initial community commit

Src/nsavi/seektable.h

@@ -0,0 +1,55 @@
+#pragma once
+#include <map>
+#include "../nsavi/avi_header.h"
+
+//#define SEEK_TABLE_STORE_CHUNK_HEADER
+namespace nsavi
+{
+	struct HeaderList;
+	struct SeekEntry
+	{
+		SeekEntry(int dummy=0) : timestamp(0), absolute(false) {}
+		int timestamp;  // in miliseconds
+		bool absolute;
+		uint64_t file_position = 0;
+#ifdef SEEK_TABLE_STORE_CHUNK_HEADER
+		uint32_t chunk_id; // chunk ID at file_position, used to verify seeking
+		uint32_t chunk_size; // chunk size at file_position, used to verify seeking
+#endif
+		uint64_t stream_time = 0; // actually allocated to header_list->stream_list_size		
+	};
+
+class SeekTable
+{
+public:
+	SeekTable(int stream_number, bool require_keyframes, const nsavi::HeaderList *header_list);
+	~SeekTable();
+	enum
+	{
+		SEEK_WHATEVER=0,
+		SEEK_FORWARD=1,
+		SEEK_BACKWARD=2,
+	};
+	const SeekEntry *GetSeekPoint(int &timestamp_ms, int current_ms=0, int seek_direction=SEEK_WHATEVER);
+	void AddIndex(const IDX1 *index);
+	void AddIndex(const INDX *index, uint64_t start_time);
+
+	// returns a recommend place to go hunting for an idx1, indx or ix## chunk
+	// usually based on indx super chunks already found in header_list
+	bool GetIndexLocation(int timestamp, uint64_t *position, uint64_t *start_time);
+	
+	typedef std::map<int, SeekEntry> SeekEntries; // mapped to timestamp in milliseconds
+	SeekEntries seek_entries; 
+	std::map<const void *, bool> data_processed; // TODO: make nu::Set
+	const nsavi::HeaderList *header_list;
+	int stream_number; // which stream number is this Seek Table associated with
+	bool require_keyframes; // whether or not the master stream requires keyframes
+	const nsavi::STRH *stream;
+	const nsavi::AVISUPERINDEX *super_index;
+	uint32_t indices_processed;
+	uint64_t super_index_duration;
+};
+
+
+
+}