Merge "MTP: Make MtpDatabase class abstract so we can have multiple implementations" (45d7927d) · Commits · e / os / android_frameworks_base

media/mtp/Android.mk

+2 −10

Original line number	Diff line number	Diff line
		@@ -32,6 +32,7 @@ LOCAL_SRC_FILES:= \
		MtpRequestPacket.cpp \
		MtpResponsePacket.cpp \
		MtpServer.cpp \
		MtpSqliteDatabase.cpp \
		MtpStorageInfo.cpp \
		MtpStringBuffer.cpp \
		MtpStorage.cpp \
		@@ -70,18 +71,9 @@ include $(CLEAR_VARS)
		LOCAL_MODULE := scantest
		LOCAL_SRC_FILES:= \
		scantest.cpp \
		MtpMediaScanner.cpp \
		MtpDatabase.cpp \
		MtpDataPacket.cpp \
		MtpPacket.cpp \
		MtpStringBuffer.cpp \
		MtpUtils.cpp \
		SqliteDatabase.cpp \
		SqliteStatement.cpp \


		#LOCAL_STATIC_LIBRARIES := libusbhost
		#LOCAL_LDLIBS := -lpthread
		LOCAL_STATIC_LIBRARIES := libmtp

		LOCAL_C_INCLUDES := external/sqlite/dist
		LOCAL_SHARED_LIBRARIES := libutils libsqlite libstagefright libmedia

media/mtp/MtpDatabase.cpp

+2 −502

Original line number	Diff line number	Diff line
		@@ -18,196 +18,14 @@

		#include "MtpDebug.h"
		#include "MtpDatabase.h"
		#include "MtpDataPacket.h"
		#include "MtpUtils.h"
		#include "SqliteDatabase.h"
		#include "SqliteStatement.h"

		#include <stdio.h>
		#include <stdlib.h>
		#include <sqlite3.h>
		#include "MtpTypes.h"
		#include "mtp.h"

		namespace android {

		#define FILE_ID_COLUMN 1
		#define FILE_PATH_COLUMN 2
		#define FILE_FORMAT_COLUMN 3
		#define FILE_PARENT_COLUMN 4
		#define FILE_STORAGE_COLUMN 5
		#define FILE_SIZE_COLUMN 6
		#define FILE_MODIFIED_COLUMN 7

		#define AUDIO_ID_COLUMN 1
		#define AUDIO_TITLE_COLUMN 2
		#define AUDIO_ARTIST_COLUMN 3
		#define AUDIO_ALBUM_COLUMN 4
		#define AUDIO_ALBUM_ARTIST_COLUMN 5
		#define AUDIO_GENRE_COLUMN 6
		#define AUDIO_COMPOSER_COLUMN 7
		#define AUDIO_TRACK_NUMBER_COLUMN 8
		#define AUDIO_YEAR_COLUMN 9
		#define AUDIO_DURATION_COLUMN 10
		#define AUDIO_USE_COUNT_COLUMN 11
		#define AUDIO_SAMPLE_RATE_COLUMN 12
		#define AUDIO_NUM_CHANNELS_COLUMN 13
		#define AUDIO_AUDIO_WAVE_CODEC_COLUMN 14
		#define AUDIO_AUDIO_BIT_RATE_COLUMN 15

		#define FILE_TABLE_CREATE "CREATE TABLE IF NOT EXISTS files (" \
		"_id INTEGER PRIMARY KEY," \
		"path TEXT," \
		"format INTEGER," \
		"parent INTEGER," \
		"storage INTEGER," \
		"size INTEGER," \
		"date_modified INTEGER" \
		");"

		#define AUDIO_TABLE_CREATE "CREATE TABLE IF NOT EXISTS audio (" \
		"id INTEGER PRIMARY KEY," \
		"title TEXT," \
		"artist TEXT," \
		"album TEXT," \
		"album_artist TEXT," \
		"genre TEXT," \
		"composer TEXT," \
		"track_number INTEGER," \
		"year INTEGER," \
		"duration INTEGER," \
		"use_count INTEGER," \
		"sample_rate INTEGER," \
		"num_channels INTEGER," \
		"audio_wave_codec TEXT," \
		"audio_bit_rate INTEGER" \
		");"

		#define PATH_INDEX_CREATE "CREATE INDEX IF NOT EXISTS path_index on files(path);"

		#define FILE_ID_QUERY "SELECT _id,format FROM files WHERE path = ?;"
		#define FILE_PATH_QUERY "SELECT path,size FROM files WHERE _id = ?"

		#define GET_OBJECT_INFO_QUERY "SELECT storage,format,parent,path,size,date_modified FROM files WHERE _id = ?;"
		#define FILE_INSERT "INSERT INTO files VALUES(?,?,?,?,?,?,?);"
		#define FILE_DELETE "DELETE FROM files WHERE _id = ?;"

		#define AUDIO_INSERT "INSERT INTO audio VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?);"
		#define AUDIO_DELETE "DELETE FROM audio WHERE id = ?;"

		struct PropertyTableEntry {
		MtpObjectProperty property;
		int type;
		const char* columnName;
		};

		static const PropertyTableEntry kPropertyTable[] = {
		{ MTP_PROPERTY_PARENT_OBJECT, MTP_TYPE_UINT32, "parent" },
		{ MTP_PROPERTY_STORAGE_ID, MTP_TYPE_UINT32, "storage" },
		{ MTP_PROPERTY_OBJECT_FORMAT, MTP_TYPE_UINT32, "format" },
		{ MTP_PROPERTY_OBJECT_FILE_NAME, MTP_TYPE_STR, "path" },
		{ MTP_PROPERTY_OBJECT_SIZE, MTP_TYPE_UINT64, "size" },
		{ MTP_PROPERTY_DATE_MODIFIED, MTP_TYPE_STR, "date_modified" },
		};

		static bool getPropertyInfo(MtpObjectProperty property, int& type, const char*& columnName) {
		int count = sizeof(kPropertyTable) / sizeof(kPropertyTable[0]);
		const PropertyTableEntry* entry = kPropertyTable;
		for (int i = 0; i < count; i++, entry++) {
		if (entry->property == property) {
		type = entry->type;
		columnName = entry->columnName;
		return true;
		}
		}
		return false;
		}



		MtpDatabase::MtpDatabase()
		: mFileIdQuery(NULL),
		mFilePathQuery(NULL),
		mObjectInfoQuery(NULL),
		mFileInserter(NULL),
		mFileDeleter(NULL),
		mAudioInserter(NULL),
		mAudioDeleter(NULL)
		{
		}

		MtpDatabase::~MtpDatabase() {
		}

		bool MtpDatabase::open(const char* path, bool create) {
		if (!SqliteDatabase::open(path, create))
		return false;

		// create tables and indices if necessary
		if (!exec(FILE_TABLE_CREATE)) {
		LOGE("could not create file table");
		return false;
		}
		if (!exec(PATH_INDEX_CREATE)) {
		LOGE("could not path index on file table");
		return false;
		}
		if (!exec(AUDIO_TABLE_CREATE)) {
		LOGE("could not create file table");
		return false;
		}

		if (!mFileIdQuery) {
		mFileIdQuery = new SqliteStatement(this);
		if (!mFileIdQuery->prepare(FILE_ID_QUERY)) {
		LOGE("could not compile FILE_ID_QUERY");
		exit(-1);
		}
		}
		if (!mFilePathQuery) {
		mFilePathQuery = new SqliteStatement(this);
		if (!mFilePathQuery->prepare(FILE_PATH_QUERY)) {
		LOGE("could not compile FILE_PATH_QUERY");
		exit(-1);
		}
		}
		if (!mObjectInfoQuery) {
		mObjectInfoQuery = new SqliteStatement(this);
		if (!mObjectInfoQuery->prepare(GET_OBJECT_INFO_QUERY)) {
		LOGE("could not compile GET_OBJECT_INFO_QUERY");
		exit(-1);
		}
		}
		if (!mFileInserter) {
		mFileInserter = new SqliteStatement(this);
		if (!mFileInserter->prepare(FILE_INSERT)) {
		LOGE("could not compile FILE_INSERT\n");
		exit(-1);
		}
		}
		if (!mFileDeleter) {
		mFileDeleter = new SqliteStatement(this);
		if (!mFileDeleter->prepare(FILE_DELETE)) {
		LOGE("could not compile FILE_DELETE\n");
		exit(-1);
		}
		}
		if (!mAudioInserter) {
		mAudioInserter = new SqliteStatement(this);
		if (!mAudioInserter->prepare(AUDIO_INSERT)) {
		LOGE("could not compile AUDIO_INSERT\n");
		exit(-1);
		}
		}
		if (!mAudioDeleter) {
		mAudioDeleter = new SqliteStatement(this);
		if (!mAudioDeleter->prepare(AUDIO_DELETE)) {
		LOGE("could not compile AUDIO_DELETE\n");
		exit(-1);
		}
		}

		return true;
		}

		uint32_t MtpDatabase::getTableForFile(MtpObjectFormat format) {
		switch (format) {
		case MTP_FORMAT_AIFF:
		@@ -260,322 +78,4 @@ uint32_t MtpDatabase::getTableForFile(MtpObjectFormat format) {
		}
		}

		MtpObjectHandle MtpDatabase::getObjectHandle(const char* path) {
		mFileIdQuery->reset();
		mFileIdQuery->bind(1, path);
		if (mFileIdQuery->step()) {
		int row = mFileIdQuery->getColumnInt(0);
		if (row > 0) {
		MtpObjectFormat format = mFileIdQuery->getColumnInt(1);
		row \|= getTableForFile(format);
		return row;
		}
		}

		return 0;
		}

		MtpObjectHandle MtpDatabase::addFile(const char* path,
		MtpObjectFormat format,
		MtpObjectHandle parent,
		MtpStorageID storage,
		uint64_t size,
		time_t modified) {
		mFileInserter->bind(FILE_PATH_COLUMN, path);
		mFileInserter->bind(FILE_FORMAT_COLUMN, format);
		mFileInserter->bind(FILE_PARENT_COLUMN, parent);
		mFileInserter->bind(FILE_STORAGE_COLUMN, storage);
		mFileInserter->bind(FILE_SIZE_COLUMN, size);
		mFileInserter->bind(FILE_MODIFIED_COLUMN, modified);
		mFileInserter->step();
		mFileInserter->reset();
		int result = lastInsertedRow();
		return (result <= 0 ? kInvalidObjectHandle : result);
		}

		MtpObjectHandle MtpDatabase::addAudioFile(MtpObjectHandle handle) {
		mAudioInserter->bind(AUDIO_ID_COLUMN, handle);
		mAudioInserter->step();
		mAudioInserter->reset();
		int result = lastInsertedRow();
		handle \|= kObjectHandleTableAudio;
		return (result > 0 ? handle : kInvalidObjectHandle);
		}

		MtpObjectHandle MtpDatabase::addAudioFile(MtpObjectHandle handle,
		const char* title,
		const char* artist,
		const char* album,
		const char* albumArtist,
		const char* genre,
		const char* composer,
		const char* mimeType,
		int track,
		int year,
		int duration) {
		mAudioInserter->bind(AUDIO_ID_COLUMN, handle);
		if (title) mAudioInserter->bind(AUDIO_TITLE_COLUMN, title);
		if (artist) mAudioInserter->bind(AUDIO_ARTIST_COLUMN, artist);
		if (album) mAudioInserter->bind(AUDIO_ALBUM_COLUMN, album);
		if (albumArtist) mAudioInserter->bind(AUDIO_ALBUM_ARTIST_COLUMN, albumArtist);
		if (genre) mAudioInserter->bind(AUDIO_GENRE_COLUMN, genre);
		if (composer) mAudioInserter->bind(AUDIO_COMPOSER_COLUMN, composer);
		if (track) mAudioInserter->bind(AUDIO_TRACK_NUMBER_COLUMN, track);
		if (year) mAudioInserter->bind(AUDIO_YEAR_COLUMN, year);
		if (duration) mAudioInserter->bind(AUDIO_DURATION_COLUMN, duration);
		mAudioInserter->step();
		mAudioInserter->reset();
		int result = lastInsertedRow();
		if (result <= 0)
		return kInvalidObjectHandle;
		result \|= kObjectHandleTableAudio;
		return result;
		}

		MtpObjectHandleList* MtpDatabase::getObjectList(MtpStorageID storageID,
		MtpObjectFormat format,
		MtpObjectHandle parent) {
		bool whereStorage = (storageID != 0xFFFFFFFF);
		bool whereFormat = (format != 0);
		bool whereParent = (parent != 0);
		char intBuffer[20];

		MtpString query("SELECT _id,format FROM files");
		if (whereStorage \|\| whereFormat \|\| whereParent)
		query += " WHERE";
		if (whereStorage) {
		snprintf(intBuffer, sizeof(intBuffer), "%d", storageID);
		query += " storage = ";
		query += intBuffer;
		}
		if (whereFormat) {
		snprintf(intBuffer, sizeof(intBuffer), "%d", format);
		if (whereStorage)
		query += " AND";
		query += " format = ";
		query += intBuffer;
		}
		if (whereParent) {
		if (parent != MTP_PARENT_ROOT)
		parent &= kObjectHandleIndexMask;
		snprintf(intBuffer, sizeof(intBuffer), "%d", parent);
		if (whereStorage \|\| whereFormat)
		query += " AND";
		query += " parent = ";
		query += intBuffer;
		}
		query += ";";

		SqliteStatement stmt(this);
		LOGV("%s", (const char *)query);
		stmt.prepare(query);

		MtpObjectHandleList* list = new MtpObjectHandleList();
		while (!stmt.isDone()) {
		if (stmt.step()) {
		int index = stmt.getColumnInt(0);
		LOGV("stmt.getColumnInt returned %d", index);
		if (index > 0) {
		MtpObjectFormat format = stmt.getColumnInt(1);
		index \|= getTableForFile(format);
		list->push(index);
		}
		}
		}
		LOGV("list size: %d", list->size());
		return list;
		}


		MtpResponseCode MtpDatabase::getObjectProperty(MtpObjectHandle handle,
		MtpObjectProperty property,
		MtpDataPacket& packet) {
		int type;
		const char* columnName;
		char intBuffer[20];

		if (handle != MTP_PARENT_ROOT)
		handle &= kObjectHandleIndexMask;

		if (!getPropertyInfo(property, type, columnName))
		return MTP_RESPONSE_INVALID_OBJECT_PROP_CODE;
		snprintf(intBuffer, sizeof(intBuffer), "%d", handle);

		MtpString query("SELECT ");
		query += columnName;
		query += " FROM files WHERE _id = ";
		query += intBuffer;
		query += ";";

		SqliteStatement stmt(this);
		LOGV("%s", (const char *)query);
		stmt.prepare(query);

		if (!stmt.step())
		return MTP_RESPONSE_INVALID_OBJECT_HANDLE;

		switch (type) {
		case MTP_TYPE_INT8:
		packet.putInt8(stmt.getColumnInt(0));
		break;
		case MTP_TYPE_UINT8:
		packet.putUInt8(stmt.getColumnInt(0));
		break;
		case MTP_TYPE_INT16:
		packet.putInt16(stmt.getColumnInt(0));
		break;
		case MTP_TYPE_UINT16:
		packet.putUInt16(stmt.getColumnInt(0));
		break;
		case MTP_TYPE_INT32:
		packet.putInt32(stmt.getColumnInt(0));
		break;
		case MTP_TYPE_UINT32:
		packet.putUInt32(stmt.getColumnInt(0));
		break;
		case MTP_TYPE_INT64:
		packet.putInt64(stmt.getColumnInt64(0));
		break;
		case MTP_TYPE_UINT64:
		packet.putUInt64(stmt.getColumnInt64(0));
		break;
		case MTP_TYPE_STR:
		packet.putString(stmt.getColumnString(0));
		break;
		default:
		LOGE("unsupported object type\n");
		return MTP_RESPONSE_INVALID_OBJECT_HANDLE;
		}
		return MTP_RESPONSE_OK;
		}

		MtpResponseCode MtpDatabase::getObjectInfo(MtpObjectHandle handle,
		MtpDataPacket& packet) {
		char date[20];

		if (handle != MTP_PARENT_ROOT)
		handle &= kObjectHandleIndexMask;

		mObjectInfoQuery->reset();
		mObjectInfoQuery->bind(1, handle);
		if (!mObjectInfoQuery->step())
		return MTP_RESPONSE_INVALID_OBJECT_HANDLE;

		MtpStorageID storageID = mObjectInfoQuery->getColumnInt(0);
		MtpObjectFormat format = mObjectInfoQuery->getColumnInt(1);
		MtpObjectHandle parent = mObjectInfoQuery->getColumnInt(2);
		// extract name from path. do we want a separate database entry for this?
		const char* name = mObjectInfoQuery->getColumnString(3);
		const char* lastSlash = strrchr(name, '/');
		if (lastSlash)
		name = lastSlash + 1;
		int64_t size = mObjectInfoQuery->getColumnInt64(4);
		time_t modified = mObjectInfoQuery->getColumnInt(5);
		int associationType = (format == MTP_FORMAT_ASSOCIATION ?
		MTP_ASSOCIATION_TYPE_GENERIC_FOLDER :
		MTP_ASSOCIATION_TYPE_UNDEFINED);

		LOGV("storageID: %d, format: %d, parent: %d", storageID, format, parent);

		packet.putUInt32(storageID);
		packet.putUInt16(format);
		packet.putUInt16(0); // protection status
		packet.putUInt32((size > 0xFFFFFFFFLL ? 0xFFFFFFFF : size));
		packet.putUInt16(0); // thumb format
		packet.putUInt32(0); // thumb compressed size
		packet.putUInt32(0); // thumb pix width
		packet.putUInt32(0); // thumb pix height
		packet.putUInt32(0); // image pix width
		packet.putUInt32(0); // image pix height
		packet.putUInt32(0); // image bit depth
		packet.putUInt32(parent);
		packet.putUInt16(associationType);
		packet.putUInt32(0); // association desc
		packet.putUInt32(0); // sequence number
		packet.putString(name); // file name
		packet.putEmptyString();
		formatDateTime(modified, date, sizeof(date));
		packet.putString(date); // date modified
		packet.putEmptyString(); // keywords

		return MTP_RESPONSE_OK;
		}

		bool MtpDatabase::getObjectFilePath(MtpObjectHandle handle,
		MtpString& filePath,
		int64_t& fileLength) {
		if (handle != MTP_PARENT_ROOT)
		handle &= kObjectHandleIndexMask;
		mFilePathQuery->reset();
		mFilePathQuery->bind(1, handle);
		if (!mFilePathQuery->step())
		return false;

		const char* path = mFilePathQuery->getColumnString(0);
		if (!path)
		return false;
		filePath = path;
		fileLength = mFilePathQuery->getColumnInt64(1);
		return true;
		}

		bool MtpDatabase::deleteFile(MtpObjectHandle handle) {
		uint32_t table = handle & kObjectHandleTableMask;
		handle &= kObjectHandleIndexMask;
		mFileDeleter->bind(1, handle);
		mFileDeleter->step();
		mFileDeleter->reset();
		if (table == kObjectHandleTableAudio) {
		mAudioDeleter->bind(1, handle);
		mAudioDeleter->step();
		mAudioDeleter->reset();
		}

		return true;
		}

		MtpObjectHandle* MtpDatabase::getFileList(int& outCount) {
		MtpObjectHandle* result = NULL;
		int count = 0;
		SqliteStatement stmt(this);
		stmt.prepare("SELECT count(*) FROM files;");

		MtpObjectHandleList* list = new MtpObjectHandleList();
		if (stmt.step())
		count = stmt.getColumnInt(0);

		if (count > 0) {
		result = new MtpObjectHandle[count];
		memset(result, 0, count * sizeof(*result));
		SqliteStatement stmt2(this);
		stmt2.prepare("SELECT _id,format FROM files;");

		for (int i = 0; i < count; i++) {
		if (!stmt2.step()) {
		LOGW("getFileList ended early");
		count = i;
		break;
		}
		MtpObjectHandle handle = stmt2.getColumnInt(0);
		MtpObjectFormat format = stmt2.getColumnInt(1);
		handle \|= getTableForFile(format);
		result[i] = handle;
		}
		}
		outCount = count;
		return result;
		}

		/*
		for getObjectPropDesc

		packet.putUInt16(property);
		packet.putUInt16(dataType);
		packet.putUInt8(getSet);
		// default value DTS
		packet.putUInt32(groupCode);
		packet.putUInt8(formFlag);
		// form, variable
		*/

		} // namespace android

media/mtp/MtpDatabase.h

+43 −51

Original line number	Diff line number	Diff line
		@@ -23,36 +23,24 @@
		namespace android {

		class MtpDataPacket;
		class SqliteStatement;

		class MtpDatabase : public SqliteDatabase {
		private:
		SqliteStatement* mFileIdQuery;
		SqliteStatement* mFilePathQuery;
		SqliteStatement* mObjectInfoQuery;
		SqliteStatement* mFileInserter;
		SqliteStatement* mFileDeleter;
		SqliteStatement* mAudioInserter;
		SqliteStatement* mAudioDeleter;

		class MtpDatabase {
		public:
		MtpDatabase();
		virtual ~MtpDatabase();

		static uint32_t getTableForFile(MtpObjectFormat format);

		bool open(const char* path, bool create);
		MtpObjectHandle getObjectHandle(const char* path);
		MtpObjectHandle addFile(const char* path,
		virtual MtpObjectHandle getObjectHandle(const char* path) = 0;
		virtual MtpObjectHandle addFile(const char* path,
		MtpObjectFormat format,
		MtpObjectHandle parent,
		MtpStorageID storage,
		uint64_t size,
		time_t modified);
		time_t modified) = 0;

		MtpObjectHandle addAudioFile(MtpObjectHandle id);
		virtual MtpObjectHandle addAudioFile(MtpObjectHandle id) = 0;

		MtpObjectHandle addAudioFile(MtpObjectHandle id,
		virtual MtpObjectHandle addAudioFile(MtpObjectHandle id,
		const char* title,
		const char* artist,
		const char* album,
		@@ -62,26 +50,30 @@ public:
		const char* mimeType,
		int track,
		int year,
		int duration);
		int duration) = 0;

		MtpObjectHandleList* getObjectList(MtpStorageID storageID,
		virtual MtpObjectHandleList* getObjectList(MtpStorageID storageID,
		MtpObjectFormat format,
		MtpObjectHandle parent);
		MtpObjectHandle parent) = 0;

		MtpResponseCode getObjectProperty(MtpObjectHandle handle,
		virtual MtpResponseCode getObjectProperty(MtpObjectHandle handle,
		MtpObjectProperty property,
		MtpDataPacket& packet);
		MtpDataPacket& packet) = 0;

		MtpResponseCode getObjectInfo(MtpObjectHandle handle,
		MtpDataPacket& packet);
		virtual MtpResponseCode getObjectInfo(MtpObjectHandle handle,
		MtpDataPacket& packet) = 0;

		bool getObjectFilePath(MtpObjectHandle handle,
		virtual bool getObjectFilePath(MtpObjectHandle handle,
		MtpString& filePath,
		int64_t& fileLength);
		bool deleteFile(MtpObjectHandle handle);
		int64_t& fileLength) = 0;
		virtual bool deleteFile(MtpObjectHandle handle) = 0;

		// helper for media scanner
		MtpObjectHandle* getFileList(int& outCount);
		virtual MtpObjectHandle* getFileList(int& outCount) = 0;

		virtual void beginTransaction() = 0;
		virtual void commitTransaction() = 0;
		virtual void rollbackTransaction() = 0;
		};

		}; // namespace android

media/mtp/MtpServer.cpp

+2 −2

Original line number	Diff line number	Diff line
		@@ -25,9 +25,9 @@
		#include <cutils/properties.h>

		#include "MtpDebug.h"
		#include "MtpDatabase.h"
		#include "MtpProperty.h"
		#include "MtpServer.h"
		#include "MtpSqliteDatabase.h"
		#include "MtpStorage.h"
		#include "MtpStringBuffer.h"

		@@ -122,7 +122,7 @@ MtpServer::MtpServer(int fd, const char* databasePath)
		mSendObjectHandle(kInvalidObjectHandle),
		mSendObjectFileSize(0)
		{
		mDatabase = new MtpDatabase();
		mDatabase = new MtpSqliteDatabase();
		mDatabase->open(databasePath, true);

		initObjectProperties();

media/mtp/MtpServer.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -27,7 +27,7 @@
		namespace android {

		class MtpStorage;
		class MtpDatabase;
		class MtpSqliteDatabase;
		class MtpProperty;

		class MtpServer {
		@@ -39,7 +39,7 @@ private:
		// path to our sqlite3 database
		const char* mDatabasePath;

		MtpDatabase* mDatabase;
		MtpSqliteDatabase* mDatabase;

		// current session ID
		MtpSessionID mSessionID;