_ak_stream_mgr_module_8h

Wwise SDK 2023.1.9

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 /// \file 
 /// Audiokinetic's implementation-specific definitions and factory of 
 /// overridable Stream Manager module.
 /// Contains the default Stream Manager's implementation-specific interfaces that altogether constitute
 /// the Low-Level I/O submodule. This submodule needs to be implemented by the game. All I/O requests 
 /// generated by the Stream Manager end up to one of the I/O hooks defined herein.
 /// Read \ref streamingmanager_lowlevel to learn more about the Low-Level I/O.
  
 #ifndef _AK_STREAM_MGR_MODULE_H_
 #define _AK_STREAM_MGR_MODULE_H_
  
 #include <AK/SoundEngine/Common/IAkStreamMgr.h>
 #include <AK/Tools/Common/AkPlatformFuncs.h>
  
 /// \name Audiokinetic Stream Manager's implementation-specific definitions.
 //@{
 /// Stream Manager initialization settings.
 /// \sa 
 /// - AK::IAkStreamMgr
 /// - AK::StreamMgr::Create()
 /// - \ref streamingmanager_settings
  
 struct AkStreamMgrSettings
 {
 };
  
 /// High-level IO devices initialization settings.
 /// \sa 
 /// - AK::IAkStreamMgr
 /// - AK::StreamMgr::CreateDevice()
 /// - \ref streamingmanager_settings
 struct AkDeviceSettings
 {
     void *              pIOMemory;                  ///< Pointer for I/O memory allocated by user.
                                                     ///< Pass NULL if you want memory to be allocated via AK::MemoryMgr::Malign().
                                                     ///< If specified, uIOMemorySize, uIOMemoryAlignment and ePoolAttributes are ignored.
     AkUInt32            uIOMemorySize;              ///< Size of memory for I/O (for automatic streams). It is passed directly to AK::MemoryMgr::Malign(), after having been rounded down to a multiple of uGranularity.
     AkUInt32            uIOMemoryAlignment;         ///< I/O memory alignment. It is passed directly to AK::MemoryMgr::Malign().
     AkUInt32            ePoolAttributes;            ///< Attributes for I/O memory. Here, specify the allocation type (AkMemType_Device, and so on). It is passed directly to AK::MemoryMgr::Malign().
     AkUInt32            uGranularity;               ///< I/O requests granularity (typical bytes/request).
     AkThreadProperties  threadProperties;           ///< Scheduler thread properties.
     AkReal32            fTargetAutoStmBufferLength; ///< Targetted automatic stream buffer length (ms). When a stream reaches that buffering, it stops being scheduled for I/O except if the scheduler is idle.
     AkUInt32            uMaxConcurrentIO;           ///< Maximum number of transfers that can be sent simultaneously to the Low-Level I/O.
     bool                bUseStreamCache;            ///< If true, the device attempts to reuse I/O buffers that have already been streamed from disk. This is particularly useful when streaming small looping sounds. However, there is a small increase in CPU usage when allocating memory, and a slightly larger memory footprint in the StreamManager pool.                                                    
     AkUInt32            uMaxCachePinnedBytes;       ///< Maximum number of bytes that can be "pinned" using AK::SoundEngine::PinEventInStreamCache() or AK::IAkStreamMgr::PinFileInCache()
 };
  
 /// File descriptor. File identification for the low-level I/O.
 /// \sa
 /// - AK::StreamMgr::IAkLowLevelIOHook
 /// - AK::StreamMgr::IAkLowLevelIOHook::BatchOpen
 /// - AK::StreamMgr::IAkLowLevelIOHook::Close
 struct AkFileDesc
 {
     AkInt64             iFileSize  = 0;         ///< File size in bytes
     AkUInt64            uSector = 0;            ///< Start sector (the sector size is specified by the low-level I/O)
                                                 ///< \sa
                                                 ///< - AK::StreamMgr::IAkFileLocationResolver::Open()
                                                 ///< - AK::StreamMgr::IAkLowLevelIOHook::GetBlockSize()
     AkFileHandle        hFile = AkFileHandle(); ///< File handle/identifier
     AkDeviceID          deviceID = AK_INVALID_DEVICE_ID;            ///< Device ID, obtained from CreateDevice() \sa AK::IAkStreamMgr::CreateDevice()
 };
  
 /// Structure for synchronous transfers handshaking with the Low-Level I/O. Used with blocking I/O hooks.
 /// \sa AK::StreamMgr::IAkLowLevelIOHook
 struct AkIOTransferInfo
 {
     AkUInt64        uFilePosition;      ///< File offset where transfer should begin.
     AkUInt32        uBufferSize;        ///< Size of the buffer in which the I/O hook can write to.
     AkUInt32        uRequestedSize;     ///< Exact number of requested bytes for this transfer. Always equal to or smaller than uBufferSize.
 };
  
 struct AkAsyncIOTransferInfo;
  
 /// Callback function prototype definition used for asynchronous I/O transfers between the Stream Manager and the Low-Level IO.
 /// Notes:
 /// - If you pass in_eResult of AK_Fail, all streams awaiting for this transfer are marked as invalid and will stop. An "IO error" notification is posted to the capture log.
 /// - If the transfer was cancelled by the Stream Manager while it was in the Low-Level IO, you must return AK_Success, whether
 /// you performed the operation or not. The Stream Manager knows that it was cancelled, so it will not try to use it after you call it back.
 /// \sa 
 /// - AkAsyncIOTransferInfo
 /// - AK::StreamMgr::IAkLowLevelIOHook
 AK_CALLBACK( void, AkIOCallback )( 
     AkAsyncIOTransferInfo * in_pTransferInfo,   ///< Pointer to the AkAsyncIOTransferInfo structure that was passed to corresponding Read() or Write() call.
     AKRESULT        in_eResult                  ///< Result of transfer: AK_Success or AK_Fail (streams waiting for this transfer become invalid).
     );
  
 /// Structure for asynchronous transfers handshaking with the Low-Level I/O. Extends AkIOTransferInfo.
 /// \sa 
 /// - AK::StreamMgr::IAkLowLevelIOHook
 /// - AkIOTransferInfo
 /// - AkAIOCallback
 struct AkAsyncIOTransferInfo : public AkIOTransferInfo
 {
     void *          pBuffer;            ///< Buffer for data transfer.
     AkIOCallback    pCallback;          ///< Callback function used to notify the high-level device when the transfer is complete.
     void *          pCookie;            ///< Reserved. The I/O device uses this cookie to retrieve the owner of the transfer.
     void *          pUserData;          ///< Custom user data.  
 };
  
 struct AkAsyncFileOpenData;
  
 /// Callback signature for the notification of completion of the asynchronous Open operation.
 /// \sa 
 /// - AkAsyncFileOpenData
 /// - AK::StreamMgr::IAkLowLevelIOHook::BatchOpen
 AK_CALLBACK(void, AkFileOpenCallback)(
     AkAsyncFileOpenData * in_pOpenInfo, ///< Pointer to the AkAsyncFileOpenData structure that was passed to corresponding Open().
     AKRESULT            in_eResult          ///< Result of transfer: AK_Success or AK_Fail (streams waiting for this transfer become invalid).
     );
  
 /// Structure used by Low Level IO Hooks (IAkLowLevelIOHook) to pass and retreive information on files to be opened by the IO hook.
 /// Please refer to AK::StreamMgr::IAkLowLevelIOHook::BatchOpen for more information about the sementics of the Open operation.
 /// \sa 
 /// - AkFileOpenData
 /// - AK::StreamMgr::IAkLowLevelIOHook::BatchOpen
 struct AkAsyncFileOpenData : public AkFileOpenData
 {
     ~AkAsyncFileOpenData();
  
     AkAsyncFileOpenData(const AkFileOpenData& in_copy)
         : pCallback(NULL)
         , pCookie(NULL)
         , pFileDesc(NULL)
         , pCustomData(NULL)
         , pszStreamName(NULL)
     {
         *(AkFileOpenData*)this = in_copy;
     }
  
     AkAsyncFileOpenData(const AkAsyncFileOpenData& in_copy)
         : pCallback(in_copy.pCallback)
         , pCookie(in_copy.pCookie)
         , pFileDesc(in_copy.pFileDesc)
         , pCustomData(NULL)
         , pszStreamName(NULL)
     {
         *(AkFileOpenData*)this = in_copy;
     }
  
     AkAsyncFileOpenData() 
         : AkFileOpenData()
         , pCallback(NULL)
         , pCookie(NULL)
         , pFileDesc(NULL)
         , pCustomData(NULL)
         , pszStreamName(NULL)
     {}
         
     AkAsyncFileOpenData(const AkOSChar* in_pszFileName, AkOpenMode in_eOpenMode = AK_OpenModeRead, AkFileSystemFlags* in_pFlags = NULL)
         :AkFileOpenData(in_pszFileName, in_eOpenMode, in_pFlags)
         , pCallback(NULL)
         , pCookie(NULL)
         , pFileDesc(NULL)
         , pCustomData(NULL)
         , pszStreamName(NULL)
     {}
  
     AkAsyncFileOpenData(AkFileID in_idFile, AkOpenMode in_eOpenMode = AK_OpenModeRead, AkFileSystemFlags* in_pFlags = NULL)
         :AkFileOpenData(in_idFile, in_eOpenMode, in_pFlags)
         , pCallback(NULL)
         , pCookie(NULL)
         , pFileDesc(NULL)
         , pCustomData(NULL)
         , pszStreamName(NULL)
     {}
  
     ///< Functions used to manage optional stream name. The name will be used when sending stream information to the Wwise profiler.
     AKRESULT SetStreamName(const AkOSChar* in_pszStreamName);
     const AkOSChar* GetStreamName() const { return pszStreamName; }
  
     AkFileOpenCallback  pCallback;          ///< Callback function used to notify the high-level device when Open is done
     void*               pCookie;            ///< Reserved. Pass this unchanged to the callback function. The I/O device uses this cookie to retrieve the owner of the transfer.
     AkFileDesc*         pFileDesc;          ///< File Descriptor to fill once the Open operation is complete. 
     void*               pCustomData;        ///< Convienience pointer for the IO hook implementer. Useful for additional data used in asynchronous implementations, for example.
  
 private:
     AkOSChar*       pszStreamName;      ///< Display name. If provided, this will be used to set the stream name, which is used for the profiler. This struct is not responsible for the memory.
 };
  
 /// Low-Level I/O requests heuristics.
 /// Used for asynchronous read requests. 
 /// \sa 
 /// - AK::StreamMgr::IAkLowLevelIOHook::BatchRead()
 /// - AK::StreamMgr::IAkLowLevelIOHook::BatchWrite()
 struct AkIoHeuristics
 {
     AkReal32        fDeadline;          ///< Operation deadline (ms). 
     AkPriority      priority;           ///< Operation priority (at the time it was scheduled and sent to the Low-Level I/O). Range is [AK_MIN_PRIORITY,AK_MAX_PRIORITY], inclusively.
 };
  
  
 //@}
  
 namespace AK
 {
     /// Audiokinetic Stream Manager's implementation-specific interfaces of the Low-Level IO submodule.
     namespace StreamMgr
     {
         /// Interface for batched deferred low-level I/O transfers.
         /// This I/O transfer handshaking method is preferred when you want to hook I/O to your own
         /// I/O streaming technology, and you want to submit multiple I/O requests in one call, so as
         /// to allow for better opportunities for CPU and I/O performance.
         /// All operations in this interface will be happening in the device's own thread, separate
         /// from the main audio thread. Also, it is assumed that all operations are asynchronous although
         /// immediate resolution is also supported.
         /// You may queue them into your own system, and even use the heuristics passed down to this
         /// level for your convenience. Note that the requests are always sent in the order that the
         /// Stream Manager considers to be the most appropriate. You may receive less than
         /// AkDeviceSettings::uMaxConcurrentIO at any given time. The number of concurrent transfers
         /// depends on the number of streams running in the high-level streaming device, and on its
         /// target buffering length and granularity. Your advantage at this level is to be aware of
         /// file placement, so you may try to re-order requests in order to minimize seeking on disk. 
         /// Calls to BatchRead()/BatchWrite() should return as soon as possible. You need to call 
         /// AkAsyncIOTransferInfo::pCallback for all individual items in a transfer batch.
         /// Cancel() is provided in order to inform you that the streaming device will flush this transfer
         /// upon completion. You may implement it or not. In all cases, you must call the callback.
         class IAkLowLevelIOHook
         {
         protected:
             /// Virtual destructor on interface to avoid warnings.
             virtual ~IAkLowLevelIOHook(){}
  
         public:
  
             /// Closes a file. 
             /// The file descriptor should be deleted during this call. 
             /// No other module should have a reference to it at this point.
             /// \return AK_Success if the file was properly cleaned-up.
             virtual AKRESULT Close(
                 AkFileDesc *            in_pFileDesc            ///< File descriptor.
                 ) = 0;
  
             /// Returns the block size for the file or its storage device. 
             /// The block size is a constraint for clients
             /// of the Stream Manager: All reads, writes and position changes need to be a multiple of
             /// that size.
             /// \return 
             /// The block size for a specific file or storage device.
             /// \remarks 
             /// - Some files might be opened with flags that require I/O transfers to be a multiple 
             /// of this size. The stream manager will query this function to resolve calls 
             /// to IAk(Auto)Stream::GetBlockSize( ).
             /// - Also, AkFileDesc::uSector specifies a number of sectors in multiples of this value.
             /// - Files/IO devices that do not require byte alignment should return 1.
             /// - Whether file opening was deferred or not, GetBlockSize() is always called right 
             /// after the first call to Open(), in the client's thread, and is never called again.
             /// \warning 
             /// Returning 0 is not allowed and will likely make the Stream Manager crash.
             /// \sa 
             /// - AK::StreamMgr::IAkLowLevelIOHook::BatchOpen()
             /// - AK::StreamMgr::IAkLowLevelIOHook::BatchRead()
             /// - AK::StreamMgr::IAkLowLevelIOHook::BatchWrite()
             virtual AkUInt32 GetBlockSize(
                 AkFileDesc &            in_fileDesc         ///< File descriptor.
                 ) = 0;
  
             /// Returns a description for the streaming device above this low-level hook.
             /// \remarks For profiling purposes only. The Release configuration of the 
             /// Stream Manager never calls it.
             virtual void GetDeviceDesc(
                 AkDeviceDesc &          out_deviceDesc      ///< Device description.
                 ) = 0;
  
             /// Returns custom profiling data for the streaming device above this low-level hook.
             /// As opposed to GetDeviceDesc(), this is called at every monitoring frame.
             /// You may implement this function in order to display any value you find useful 
             /// in the "Streaming Devices" tab of the Wwise profiler ("Custom Param" column).
             /// \remarks For profiling purposes only. The Release configuration of the 
             /// Stream Manager never calls it.
             /// \return A 32-bit unsigned value to display in the Wwise profiler.
             virtual AkUInt32 GetDeviceData() = 0;
  
             struct BatchIoTransferItem
             {
                 AkFileDesc* pFileDesc;
                 AkIoHeuristics ioHeuristics;
                 AkAsyncIOTransferInfo* pTransferInfo;
             };
  
  
             /// Request to open multiple files (asynchronous). 
             /// \remarks 
             /// - The pCallback within each AkAsyncFileOpenData must be called when completed. 
             /// - It is possible to mix synchronous and asynchronous file opens, as long as all pCallbacks are eventually called.
             /// - When implementing this function, make sure to process all items even if one fails to be dispatched or to open.
             /// - Pointers in in_ppItems will stay valid until pCallback is called to signal the operation result.
             virtual void BatchOpen(
                 AkUInt32                        in_uNumFiles,           ///< Number of transfers to process
                 AkAsyncFileOpenData**           in_ppItems              ///< List of files to open. See remarks above.
             ) = 0;
  
             /// Reads multiple data from multiple files (asynchronous).
             /// \remarks 
             /// - Queue up multiple read requests at once, using the provided array of in_pTransferItems. There will
             /// be in_uNumTransfers number of items in the array.
             /// - The pCallback within each BatchIoTransferItem::pTransferInfo must be called when completed.
             /// - The pointer to each BatchIoTransferItem::pTransferInfo will be valid until the high-level
             /// device is notified through the callback. However, the array of in_pTransferItems will not be valid.
             /// - File position passed in each BatchIoTransferItem::pTransferInfo takes the offset of this file relative 
             /// to AkFileDesc::hFile (described with AkFileDesc::uSector). It is computed by the high-level 
             /// device as "pFileDesc->uSector * Block_Size + Stream_Position", where Block_Size is obtained 
             /// via AK::StreamMgr::IAkLowLevelIOHook::GetBlockSize(). 
             virtual void BatchRead(
                 AkUInt32                        in_uNumTransfers,       ///< Number of transfers to process
                 BatchIoTransferItem*            in_pTransferItems       ///< List of transfer items to process
             ) = 0;
  
             /// Write multiple data to multiple files (asynchronous).
             /// \remarks 
             /// - Queue up multiple write requests at once, using the provided array of in_pTransferItems. There will
             /// be in_uNumTransfers number of items in the array.
             /// - The pCallback within each BatchIoTransferItem::pTransferInfo must be called when completed.
             /// - The pointer to each BatchIoTransferItem::pTransferInfo will be valid until the high-level
             /// device is notified through the callback. However, the array of in_pTransferItems will not be valid.
             /// - File position passed in each BatchIoTransferItem::pTransferInfo takes the offset of this file relative 
             /// to AkFileDesc::hFile (described with AkFileDesc::uSector). It is computed by the high-level 
             /// device as "pFileDesc->uSector * Block_Size + Stream_Position", where Block_Size is obtained 
             /// via AK::StreamMgr::IAkLowLevelIOHook::GetBlockSize().
             virtual void BatchWrite(
                 AkUInt32                        in_uNumTransfers,       ///< Number of transfers to process
                 BatchIoTransferItem*            in_pTransferItems       ///< List of transfer items to process
             ) = 0;
  
             /// Notifies that a transfer request is cancelled. It will be flushed by the streaming device when completed.
             /// Cancellation is normal and happens regularly; for example, whenever a sound stops before the end
             /// or stops looping. It happens even more frequently when buffering (AkDeviceSettings::fTargetAutoStmBufferLength 
             /// and AkDeviceSettings::uGranularity) is large and when you low-level IO hook accepts many concurrent requests
             /// at the same time.
             /// \remarks
             /// - BatchCancel() is an optional functionality that can be implemented as a no-op.
             /// - BatchCancel() simply informs the Low-Level I/O that a specific transfer will be flushed upon reception. 
             /// The Low-Level I/O may use this information to stop this transfer right away, or not (it is internally tagged
             /// by the high-level device as cancelled). Nevertheless, the callback function MUST be called for cancelled 
             /// transfers to be resolved.
             /// - When calling the callback function of a cancelled transfer, pass it *AK_Success*. Passing AK_Fail 
             /// to AkAsyncIOTransfer::pCallback has the effect of killing the stream once and for all. This is not
             /// what you want.
             /// - If io_bCancelAllTransfersForThisFile is set, you may cancel all transfers for this file at once.
             /// Leave io_bCancelAllTransfersForThisFile to true if you don't want to be called again. For example, if
             /// you don't do anything special in BatchCancel(), leave it to true. This will reduce the amount of useless calls.
             /// If you set it to false, BatchCancel() will be called again for each remaining pending transfer that need to be cancelled. 
             /// - If io_bCancelAllTransfersForThisFile is not set, BatchCancel() is only called for a subset of pending 
             /// transfers for this file. You must not set it to true, as BatchCancel() needs to be called explicitly for each transfer that 
             /// should be cancelled.
             /// \warning
             /// - The calling thread holds the stream's lock. You may call the callback function directly from here
             /// (if you can guarantee that the I/O buffer will not be accessed in the meantime), but you must not wait here 
             /// for another thread to call the callback function.
             /// - Likewise, if you resolve transfers with your own thread and use a lock to protect your transfers queue, 
             /// be careful not to run into a deadlock. BatchCancel() can be executed by any thread. Thus, if you need to lock your queue 
             /// in BatchCancel(), you must never hold this lock when calling back transfers, either from within BatchCancel() or from your 
             /// worker thread's routine. Lock your list, dequeue the transfer if you can, unlock, and call pCallback if and only if 
             /// the transfer was found and dequeued. On the other hand, if you choose not to do anything in BatchCancel(), the lock only protects 
             /// your list between Read()/Write() and your worker thread's routine, and since the device I/O thread does not hold the 
             /// stream's lock while calling Read()/Write(), your worker thread may therefore hold it while calling back transfers.
             /// - A race condition exists when cancelling all transfers (io_bCancelAllTransfersForThisFile is true) directly from within this hook. 
             /// If you handle the io_bCancelAllTransfersForThisFile == true case, you need to defer calling the completion callback to later 
             /// (from your usual I/O completion thread, for example). This will be fixed in a future version of Wwise.
             virtual void BatchCancel(
                 AkUInt32                        in_uNumTransfers,                       ///< Number of transfers to process
                 BatchIoTransferItem*            in_pTransferItems,                      ///< List of transfer items to process
                 bool**                          io_ppbCancelAllTransfersForThisFile     ///< Flag for each transfer indicating whether all transfers should be cancelled for this file (see notes in function description).
             ) = 0;
  
             /// This function is called to provide information when file related errors occur. The base paths known by this IO hook should be returned in out_searchedPath.
             virtual AKRESULT OutputSearchedPaths(
                 AKRESULT in_result,                     ///< Result of the open call
                 const AkFileOpenData& in_FileOpen,      ///< File name and flags passed to the Open call.
                 AkOSChar* out_searchedPath,             ///< Pre-allocated string buffer to be filled with all searched paths searched for the file.
                 AkInt32 in_pathSize                     ///< The maximum size of the string
             ) { 
                 AK_UNUSEDVAR(in_result);
                 AK_UNUSEDVAR(in_FileOpen);
                 AK_UNUSEDVAR(out_searchedPath);
                 AK_UNUSEDVAR(in_pathSize);
                 return AK_NotImplemented; };
         };
  
         /// File location resolver interface. There is one and only one File Location Resolver that is
         /// registered to the Stream Manager (using AK::StreamMgr::SetFileLocationResolver()). Its purpose
         /// is to resolve a file name or ID to a streaming device (I/O hook) that can handle the file.
         /// When your Low-Level I/O submodule uses a single device, you should create a standalone I/O
         /// hook which implements one of the I/O hooks defined above, as well 
         /// as the File Location Resolver. You then register this object to the Stream Manager as the 
         /// File Location Resolver.
         /// If you wish to create multiple devices, then you should have a separate object that implements
         /// AK::StreamMgr::IAkFileLocationResolver and registers to the Stream Manager as such. This object
         /// will be used to dispatch the file open request to the appropriate device. The strategy you will 
         /// use to select the correct device is up to you to implement.
         /// There is a built-in mechanism of chaining devices through GetNextPreferredDevice(). 
         /// If a device can't open a file GetNextPreferredDevice will be called again to get the next 
         /// device to check.
         class IAkFileLocationResolver
         {
         protected:
             /// Virtual destructor on interface to avoid warnings.
             virtual ~IAkFileLocationResolver(){}
  
         public:
  
             /// Determines which device to use to open a file. 
             /// If your File Resolver only handles one device, return AK_NotImplemented and the StreamMgr will use the only device configured.
             /// If it handles multiple devices, you can base the decision on where to get the file on any kind of heuristic: 
             /// file extension, file name, access rights, CodecID, etc.
             /// The order in which devices are searched is left to the implementer.
             /// This function will always be called first with io_idDevice = AK_INVALID_DEVICE_ID. 
             /// \return
             ///     - AK_Success if there is a device to delegate the Open() call to. io_idDevice should be set to the proper AkDeviceID (as returned by AK::StreamMgr::CreateDevice).
             ///     - AK_FileNotFound if all devices have been exhausted. 
             ///     - AK_NotImplemented if there is only one device in the system and file resolution is trivial.
             /// \remark
             /// This can be called from multiple threads.
             virtual AKRESULT GetNextPreferredDevice(
                 AkAsyncFileOpenData& in_FileOpen,   ///< File name and flags passed to the Open call.
                 AkDeviceID& io_idDevice             ///< In: last device used. Out: next device to use to open the file
                 ) 
             { 
                 AK_UNUSEDVAR(in_FileOpen);
                 AK_UNUSEDVAR(io_idDevice);
                 return AK_NotImplemented;
             };
         };
  
         /// \name Audiokinetic implementation-specific Stream Manager factory.
         //@{
         /// Stream Manager factory.
         /// \remarks 
         /// - In order for the Stream Manager to work properly, you also need to create 
         /// at least one streaming device (and implement its I/O hook), and register the 
         /// File Location Resolver with AK::StreamMgr::SetFileLocationResolver().
         /// - Use AK::StreamMgr::GetDefaultSettings(), then modify the settings you want,
         /// then feed this function with them.
         /// \sa 
         /// - AK::IAkStreamMgr
         /// - AK::StreamMgr::SetFileLocationResolver()
         /// - AK::StreamMgr::GetDefaultSettings()
         AK_EXTERNAPIFUNC( IAkStreamMgr *, Create )( 
             const AkStreamMgrSettings & in_settings     ///< Stream manager initialization settings.
             );
  
         /// Get the default values for the Stream Manager's settings.
         /// \sa 
         /// - AK::StreamMgr::Create()
         /// - AkStreamMgrSettings
         /// - \ref streamingmanager_settings
         AK_EXTERNAPIFUNC( void, GetDefaultSettings )(
             AkStreamMgrSettings &       out_settings    ///< Returned AkStreamMgrSettings structure with default values.
             );
  
         /// Get the one and only File Location Resolver registered to the Stream Manager.
         /// \sa
         /// - AK::StreamMgr::IAkFileLocationResolver
         /// - AK::StreamMgr::SetFileLocationResolver()
         AK_EXTERNAPIFUNC( IAkFileLocationResolver *, GetFileLocationResolver )();
  
         /// Register the one and only File Location Resolver to the Stream Manager.
         /// \sa 
         /// - AK::StreamMgr::IAkFileLocationResolver
         AK_EXTERNAPIFUNC( void, SetFileLocationResolver )(
             IAkFileLocationResolver *   in_pFileLocationResolver ///< Interface to your File Location Resolver
             );
  
         //@}
  
         /// \name Stream Manager: High-level I/O devices management.
         //@{
         /// Streaming device creation.
         /// Creates a high-level device, with specific settings. 
         /// You need to provide the associated low-level I/O hook, implemented on your side.
         /// \return The device ID. AK_INVALID_DEVICE_ID if there was an error and it could not be created.
         /// \warning 
         /// - This function is not thread-safe.
         /// \remarks 
         /// - You may use AK::StreamMgr::GetDefaultDeviceSettings() first to get default values for the 
         /// settings, change those you want, then feed the structure to this function.
         /// - The returned device ID should be kept by the Low-Level IO, to assign it to file descriptors
         /// in AK::StreamMgr::IAkLowLevelIOHook::BatchOpen().
         /// \return
         /// - AK_Success: Device was added to the system properly
         /// - AK_InsufficientMemory: Not enough memory to complete the operation
         /// - AK_InvalidParameter: One of the settings in AkDeviceSettings is out of range. Check asserts or debug console.
         /// \sa
         /// - AK::StreamMgr::IAkLowLevelIOHook
         /// - AK::StreamMgr::GetDefaultDeviceSettings()
         /// - \ref streamingmanager_settings
         AK_EXTERNAPIFUNC( AKRESULT, CreateDevice )(
             const AkDeviceSettings &    in_settings,        ///< Device settings.
             IAkLowLevelIOHook *         in_pLowLevelHook,   ///< Associated low-level I/O hook. Pass either a IAkLowLevelIOHook interface, consistent with the type of the scheduler.
             AkDeviceID&                 out_idDevice        ///< Assigned unique device id to use in all other functions of this interface.
             );
         /// Streaming device destruction.
         /// \return AK_Success if the device was successfully destroyed.
         /// \warning This function is not thread-safe. No stream should exist for that device when it is destroyed.
         AK_EXTERNAPIFUNC( AKRESULT, DestroyDevice )(
             AkDeviceID                  in_deviceID         ///< Device ID of the device to destroy.
             );
         
         /// Execute pending I/O operations on all created I/O devices.
         /// This should only be called in single-threaded environments where an I/O device cannot spawn a thread.
         /// \return AK_Success when called from an appropriate environment, AK_NotCompatible otherwise.
         /// \sa 
         /// - AK::StreamMgr::CreateDevice()
         AK_EXTERNAPIFUNC( AKRESULT, PerformIO )();
  
         /// Get the default values for the streaming device's settings. Recommended usage
         /// is to call this function first, then pass the settings to AK::StreamMgr::CreateDevice().
         /// \sa 
         /// - AK::StreamMgr::CreateDevice()
         /// - AkDeviceSettings
         /// - \ref streamingmanager_settings
         AK_EXTERNAPIFUNC( void, GetDefaultDeviceSettings )(
             AkDeviceSettings &          out_settings        ///< Returned AkDeviceSettings structure with default values.
             );
         //@}
  
         /// \name Language management.
         //@{
         /// Set the current language once and only once, here. The language name is stored in a static buffer 
         /// inside the Stream Manager. In order to resolve localized (language-specific) file location,
         /// AK::StreamMgr::IAkFileLocationResolver implementations query this string. They may use it to 
         /// construct a file path (for e.g. SDK/samples/SoundEngine/Common/AkFileLocationBase.cpp), or to
         /// find a language-specific file within a look-up table (for e.g. SDK/samples/SoundEngine/Common/AkFilePackageLUT.cpp).
         /// Pass a valid null-terminated string, without a trailing slash or backslash. Empty strings are accepted.
         /// You may register for language changes (see RegisterToLanguageChangeNotification()). 
         /// After changing the current language, all observers are notified.
         /// \return AK_Success if successful (if language string has less than AK_MAX_LANGUAGE_NAME_SIZE characters). AK_Fail otherwise.
         /// \warning Not multithread safe.
         /// \sa 
         /// - AK::StreamMgr::GetCurrentLanguage()
         /// - AK::StreamMgr::AddLanguageChangeObserver()
         AK_EXTERNAPIFUNC( AKRESULT, SetCurrentLanguage )(
             const AkOSChar *    in_pszLanguageName          ///< Language name.
             );
  
         /// Get the current language. The language name is stored in a static buffer inside the Stream Manager, 
         /// with AK::StreamMgr::SetCurrentLanguage(). In order to resolve localized (language-specific) file location,
         /// AK::StreamMgr::IAkFileLocationResolver implementations query this string. They may use it to 
         /// construct a file path (for e.g. SDK/samples/SoundEngine/Common/AkFileLocationBase.cpp), or to
         /// find a language-specific file within a look-up table (for e.g. SDK/samples/SoundEngine/Common/AkFilePackageLUT.cpp).
         /// \return Current language.
         /// \sa AK::StreamMgr::SetCurrentLanguage()
         AK_EXTERNAPIFUNC( const AkOSChar *, GetCurrentLanguage )();
  
         /// Definition of handlers for language change notifications.
         /// Called after SetCurrentLanguage() is called.
         /// \warning Do not call AddLanguageChangeObserver or SetCurrentLanguage from within your handler.
         /// \warning Not multithread safe.
         /// \sa 
         /// - AK::StreamMgr::SetCurrentLanguage()
         /// - AK::StreamMgr::AddLanguageChangeObserver()
         AK_CALLBACK( void, AkLanguageChangeHandler )( 
             const AkOSChar * const in_pLanguageName,///< New language name.
             void * in_pCookie                       ///< Cookie that was passed to AddLanguageChangeObserver().
             );
  
         /// Register to language change notifications.
         /// \return AK_Success if successful, AK_Fail otherwise (no memory or no cookie).
         /// \warning Not multithread safe.
         /// \sa 
         /// - AK::StreamMgr::SetCurrentLanguage()
         /// - AK::StreamMgr::RemoveLanguageChangeObserver()
         AK_EXTERNAPIFUNC( AKRESULT, AddLanguageChangeObserver )(
             AkLanguageChangeHandler in_handler, ///< Callback function.
             void * in_pCookie                   ///< Cookie, passed back to AkLanguageChangeHandler. Must set.
             );
  
         /// Unregister to language change notifications. Use the cookie you have passed to 
         /// AddLanguageChangeObserver() to identify the observer.
         /// \warning Not multithread safe.
         /// \sa 
         /// - AK::StreamMgr::SetCurrentLanguage()
         /// - AK::StreamMgr::AddLanguageChangeObserver()
         AK_EXTERNAPIFUNC( void, RemoveLanguageChangeObserver )(
             void * in_pCookie                   ///< Cookie that was passed to AddLanguageChangeObserver().
             );
  
         /// \name Stream Manager: Cache management.
         //@{
         /// Flush cache of all devices. This function has no effect for devices where
         /// AkDeviceSettings::bUseStreamCache was set to false (no caching).
         /// \sa
         /// - \ref streamingmanager_settings
         AK_EXTERNAPIFUNC( void, FlushAllCaches )();
         
         //@}
     }
 }
  
 #endif //_AK_STREAM_MGR_MODULE_H_

AkAsyncIOTransferInfo::pCookie

void * pCookie

Reserved. The I/O device uses this cookie to retrieve the owner of the transfer.

Definition: AkStreamMgrModule.h:123

AkDeviceSettings::uIOMemoryAlignment

AkUInt32 uIOMemoryAlignment

I/O memory alignment. It is passed directly to AK::MemoryMgr::Malign().

Definition: AkStreamMgrModule.h:64

AK::StreamMgr::IAkLowLevelIOHook

Definition: AkStreamMgrModule.h:245

AkIoHeuristics::fDeadline

AkReal32 fDeadline

Operation deadline (ms).

Definition: AkStreamMgrModule.h:214

Audiokinetic namespace

Definition: AkWwiseSDKVersion.cs:31

AkAsyncIOTransferInfo

Definition: AkStreamMgrModule.h:120

AkThreadProperties

Definition: AkPlatformFuncs.h:47

AkFileDesc

Definition: AkStreamMgrModule.h:80

AK::StreamMgr::IAkLowLevelIOHook::BatchRead

virtual void BatchRead(AkUInt32 in_uNumTransfers, BatchIoTransferItem *in_pTransferItems)=0

AK::StreamMgr::IAkLowLevelIOHook::BatchIoTransferItem::pFileDesc

AkFileDesc * pFileDesc

Definition: AkStreamMgrModule.h:302

AK::StreamMgr::DestroyDevice

AKSOUNDENGINE_API AKRESULT DestroyDevice(AkDeviceID in_deviceID)

AkFileOpenData

Definition: IAkStreamMgr.h:226

AK::StreamMgr::SetCurrentLanguage

AKSOUNDENGINE_API AKRESULT SetCurrentLanguage(const AkOSChar *in_pszLanguageName)

AK::StreamMgr::IAkLowLevelIOHook::GetDeviceData

virtual AkUInt32 GetDeviceData()=0

AkAsyncFileOpenData::AkAsyncFileOpenData

AkAsyncFileOpenData(AkFileID in_idFile, AkOpenMode in_eOpenMode=AK_OpenModeRead, AkFileSystemFlags *in_pFlags=NULL)

Functions used to manage optional stream name. The name will be used when sending stream information ...

Definition: AkStreamMgrModule.h:185

AK::StreamMgr::AkLanguageChangeHandler

void(* AkLanguageChangeHandler)(const AkOSChar *const in_pLanguageName, void *in_pCookie)

Definition: AkStreamMgrModule.h:578

AkDeviceSettings::uMaxCachePinnedBytes

AkUInt32 uMaxCachePinnedBytes

Maximum number of bytes that can be "pinned" using AK::SoundEngine::PinEventInStreamCache() or AK::IA...

Definition: AkStreamMgrModule.h:71

AkAsyncIOTransferInfo::pUserData

void * pUserData

Custom user data.

Definition: AkStreamMgrModule.h:124

AkIOTransferInfo::uRequestedSize

AkUInt32 uRequestedSize

Exact number of requested bytes for this transfer. Always equal to or smaller than uBufferSize.

Definition: AkStreamMgrModule.h:96

AK::IAkStreamMgr

Definition: IAkStreamMgr.h:725

AkAsyncFileOpenData::AkAsyncFileOpenData

AkAsyncFileOpenData(const AkFileOpenData &in_copy)

Definition: AkStreamMgrModule.h:147

AK_EXTERNAPIFUNC

#define AK_EXTERNAPIFUNC(_type, _name)

Definition: AkSoundEngineExport.h:81

AkDeviceSettings::uMaxConcurrentIO

AkUInt32 uMaxConcurrentIO

Maximum number of transfers that can be sent simultaneously to the Low-Level I/O.

Definition: AkStreamMgrModule.h:69

AkDeviceSettings::fTargetAutoStmBufferLength

AkReal32 fTargetAutoStmBufferLength

Targetted automatic stream buffer length (ms). When a stream reaches that buffering,...

Definition: AkStreamMgrModule.h:68

AkDeviceSettings::bUseStreamCache

bool bUseStreamCache

If true, the device attempts to reuse I/O buffers that have already been streamed from disk....

Definition: AkStreamMgrModule.h:70

AK::StreamMgr::GetDefaultSettings

AKSOUNDENGINE_API void GetDefaultSettings(AkStreamMgrSettings &out_settings)

AKRESULT

Standard function call result.

Definition: AkTypes.h:131

AK_INVALID_DEVICE_ID

static const AkDeviceID AK_INVALID_DEVICE_ID

Invalid streaming device ID

Definition: AkTypes.h:103

AK::StreamMgr::IAkLowLevelIOHook::~IAkLowLevelIOHook

virtual ~IAkLowLevelIOHook()

Virtual destructor on interface to avoid warnings.

Definition: AkStreamMgrModule.h:248

AkAsyncFileOpenData::AkAsyncFileOpenData

AkAsyncFileOpenData(const AkOSChar *in_pszFileName, AkOpenMode in_eOpenMode=AK_OpenModeRead, AkFileSystemFlags *in_pFlags=NULL)

Definition: AkStreamMgrModule.h:176

AkDeviceID

AkUInt32 AkDeviceID

I/O device ID

Definition: AkTypes.h:78

AkFileDesc::deviceID

AkDeviceID deviceID

Device ID, obtained from CreateDevice()

Definition: AkStreamMgrModule.h:87

AK_OpenModeRead

@ AK_OpenModeRead

Read-only access

Definition: IAkStreamMgr.h:73

AkIoHeuristics::priority

AkPriority priority

Operation priority (at the time it was scheduled and sent to the Low-Level I/O). Range is [AK_MIN_PRI...

Definition: AkStreamMgrModule.h:215

AkIOCallback

void(* AkIOCallback)(AkAsyncIOTransferInfo *in_pTransferInfo, AKRESULT in_eResult)

Definition: AkStreamMgrModule.h:109

AkOSChar

char AkOSChar

Generic character string

Definition: AkTypes.h:60

AkDeviceSettings::ePoolAttributes

AkUInt32 ePoolAttributes

Attributes for I/O memory. Here, specify the allocation type (AkMemType_Device, and so on)....

Definition: AkStreamMgrModule.h:65

AkDeviceSettings

Definition: AkStreamMgrModule.h:59

NULL

#define NULL

Definition: AkTypes.h:46

AkIOTransferInfo::uBufferSize

AkUInt32 uBufferSize

Size of the buffer in which the I/O hook can write to.

Definition: AkStreamMgrModule.h:95

AkReal32

float AkReal32

32-bit floating point

Definition: AkNumeralTypes.h:46

AkFileHandle

FILE * AkFileHandle

File handle

Definition: AkTypes.h:77

AkInt32

int32_t AkInt32

Signed 32-bit integer

Definition: AkNumeralTypes.h:43

AkAsyncIOTransferInfo::pBuffer

void * pBuffer

Buffer for data transfer.

Definition: AkStreamMgrModule.h:121

AkFileOpenCallback

void(* AkFileOpenCallback)(AkAsyncFileOpenData *in_pOpenInfo, AKRESULT in_eResult)

Definition: AkStreamMgrModule.h:133

AkAsyncFileOpenData::pCookie

void * pCookie

Reserved. Pass this unchanged to the callback function. The I/O device uses this cookie to retrieve t...

Definition: AkStreamMgrModule.h:199

AkAsyncFileOpenData::pCustomData

void * pCustomData

Convienience pointer for the IO hook implementer. Useful for additional data used in asynchronous imp...

Definition: AkStreamMgrModule.h:201

AkAsyncFileOpenData::AkAsyncFileOpenData

AkAsyncFileOpenData(const AkAsyncFileOpenData &in_copy)

Definition: AkStreamMgrModule.h:157

AkFileID

AkUInt32 AkFileID

Integer-type file identifier

Definition: AkTypes.h:77

IAkStreamMgr.h

AkDeviceSettings::uGranularity

AkUInt32 uGranularity

I/O requests granularity (typical bytes/request).

Definition: AkStreamMgrModule.h:66

AkIoHeuristics

Definition: AkStreamMgrModule.h:213

AK::StreamMgr::IAkLowLevelIOHook::BatchIoTransferItem

Definition: AkStreamMgrModule.h:301

AK::StreamMgr::IAkLowLevelIOHook::GetDeviceDesc

virtual void GetDeviceDesc(AkDeviceDesc &out_deviceDesc)=0

AK::StreamMgr::PerformIO

AKSOUNDENGINE_API AKRESULT PerformIO()

AkAsyncFileOpenData::pCallback

AkFileOpenCallback pCallback

Callback function used to notify the high-level device when Open is done

Definition: AkStreamMgrModule.h:198

AkAsyncFileOpenData::SetStreamName

AKRESULT SetStreamName(const AkOSChar *in_pszStreamName)

AK::StreamMgr::IAkLowLevelIOHook::BatchCancel

virtual void BatchCancel(AkUInt32 in_uNumTransfers, BatchIoTransferItem *in_pTransferItems, bool **io_ppbCancelAllTransfersForThisFile)=0

AkPriority

AkInt8 AkPriority

Priority

Definition: AkTypes.h:67

AK::StreamMgr::IAkFileLocationResolver::GetNextPreferredDevice

virtual AKRESULT GetNextPreferredDevice(AkAsyncFileOpenData &in_FileOpen, AkDeviceID &io_idDevice)

Definition: AkStreamMgrModule.h:440

AK::StreamMgr::CreateDevice

AKSOUNDENGINE_API AKRESULT CreateDevice(const AkDeviceSettings &in_settings, IAkLowLevelIOHook *in_pLowLevelHook, AkDeviceID &out_idDevice)

AkPlatformFuncs.h

AkAsyncFileOpenData::AkAsyncFileOpenData

AkAsyncFileOpenData()

Definition: AkStreamMgrModule.h:167

AK_CALLBACK

#define AK_CALLBACK(_type, _name)

Definition: AkSoundEngineExport.h:87

AK::StreamMgr::IAkLowLevelIOHook::Close

virtual AKRESULT Close(AkFileDesc *in_pFileDesc)=0

AkAsyncFileOpenData::~AkAsyncFileOpenData

~AkAsyncFileOpenData()

AK_NotImplemented

@ AK_NotImplemented

This feature is not implemented.

Definition: AkTypes.h:132

AkFileDesc::uSector

AkUInt64 uSector

Definition: AkStreamMgrModule.h:82

AkFileSystemFlags

File system flags for file descriptors mapping.

Definition: IAkStreamMgr.h:81

AK::StreamMgr::IAkLowLevelIOHook::GetBlockSize

virtual AkUInt32 GetBlockSize(AkFileDesc &in_fileDesc)=0

AkIOTransferInfo

Definition: AkStreamMgrModule.h:93

AkInt64

int64_t AkInt64

Signed 64-bit integer

Definition: AkNumeralTypes.h:44

AkAsyncFileOpenData::GetStreamName

const AkOSChar * GetStreamName() const

Definition: AkStreamMgrModule.h:196

AkAsyncFileOpenData

Definition: AkStreamMgrModule.h:144

AkAsyncIOTransferInfo::pCallback

AkIOCallback pCallback

Callback function used to notify the high-level device when the transfer is complete.

Definition: AkStreamMgrModule.h:122

AkUInt64

uint64_t AkUInt64

Unsigned 64-bit integer

Definition: AkNumeralTypes.h:39

AK::StreamMgr::GetFileLocationResolver

AKSOUNDENGINE_API IAkFileLocationResolver * GetFileLocationResolver()

AK::StreamMgr::IAkLowLevelIOHook::BatchWrite

virtual void BatchWrite(AkUInt32 in_uNumTransfers, BatchIoTransferItem *in_pTransferItems)=0

AK::StreamMgr::Create

AKSOUNDENGINE_API IAkStreamMgr * Create(const AkStreamMgrSettings &in_settings)

AK::StreamMgr::FlushAllCaches

AKSOUNDENGINE_API void FlushAllCaches()

AkOpenMode

File open mode.

Definition: IAkStreamMgr.h:72

AkDeviceDesc

Device descriptor.

Definition: IAkStreamMgr.h:162

AK::StreamMgr::IAkLowLevelIOHook::BatchIoTransferItem::ioHeuristics

AkIoHeuristics ioHeuristics

Definition: AkStreamMgrModule.h:303

AK::StreamMgr::GetDefaultDeviceSettings

AKSOUNDENGINE_API void GetDefaultDeviceSettings(AkDeviceSettings &out_settings)

AK::StreamMgr::SetFileLocationResolver

AKSOUNDENGINE_API void SetFileLocationResolver(IAkFileLocationResolver *in_pFileLocationResolver)

AkUInt32

uint32_t AkUInt32

Unsigned 32-bit integer

Definition: AkNumeralTypes.h:38

AK_UNUSEDVAR

#define AK_UNUSEDVAR(x)

Definition: AkPlatforms.h:166

AkAsyncFileOpenData::pFileDesc

AkFileDesc * pFileDesc

File Descriptor to fill once the Open operation is complete.

Definition: AkStreamMgrModule.h:200

AK::StreamMgr::IAkLowLevelIOHook::BatchOpen

virtual void BatchOpen(AkUInt32 in_uNumFiles, AkAsyncFileOpenData **in_ppItems)=0

AK::StreamMgr::RemoveLanguageChangeObserver

AKSOUNDENGINE_API void RemoveLanguageChangeObserver(void *in_pCookie)

AK::StreamMgr::AddLanguageChangeObserver

AKSOUNDENGINE_API AKRESULT AddLanguageChangeObserver(AkLanguageChangeHandler in_handler, void *in_pCookie)

AkIOTransferInfo::uFilePosition

AkUInt64 uFilePosition

File offset where transfer should begin.

Definition: AkStreamMgrModule.h:94

AK::StreamMgr::IAkFileLocationResolver::~IAkFileLocationResolver

virtual ~IAkFileLocationResolver()

Virtual destructor on interface to avoid warnings.

Definition: AkStreamMgrModule.h:424

AkDeviceSettings::uIOMemorySize

AkUInt32 uIOMemorySize

Size of memory for I/O (for automatic streams). It is passed directly to AK::MemoryMgr::Malign(),...

Definition: AkStreamMgrModule.h:63

AkFileDesc::hFile

AkFileHandle hFile

File handle/identifier

Definition: AkStreamMgrModule.h:86

AkStreamMgrSettings

Definition: AkStreamMgrModule.h:50

AK::StreamMgr::IAkLowLevelIOHook::OutputSearchedPaths

virtual AKRESULT OutputSearchedPaths(AKRESULT in_result, const AkFileOpenData &in_FileOpen, AkOSChar *out_searchedPath, AkInt32 in_pathSize)

This function is called to provide information when file related errors occur. The base paths known b...

Definition: AkStreamMgrModule.h:393

AkFileDesc::iFileSize

AkInt64 iFileSize

File size in bytes

Definition: AkStreamMgrModule.h:81

AK::StreamMgr::IAkLowLevelIOHook::BatchIoTransferItem::pTransferInfo

AkAsyncIOTransferInfo * pTransferInfo

Definition: AkStreamMgrModule.h:304

AK::StreamMgr::GetCurrentLanguage

AKSOUNDENGINE_API const AkOSChar * GetCurrentLanguage()

AkDeviceSettings::threadProperties

AkThreadProperties threadProperties

Scheduler thread properties.

Definition: AkStreamMgrModule.h:67

AkDeviceSettings::pIOMemory

void * pIOMemory

Definition: AkStreamMgrModule.h:60

AK::StreamMgr::IAkFileLocationResolver

Definition: AkStreamMgrModule.h:421

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