author | Mikael Laine <mikael.laine@ixonos.com> |
Fri, 29 Jan 2010 14:08:33 +0200 | |
changeset 0 | 951a5db380a0 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010 Ixonos Plc. |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - Initial contribution |
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* |
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* Contributors: |
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* Ixonos Plc |
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* |
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* Description: |
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* |
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*/ |
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#ifndef __AUDCLIPINFO_H__ |
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#define __AUDCLIPINFO_H__ |
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#include <e32base.h> |
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#include <MdaAudioSamplePlayer.h> |
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#include "AudCommon.h" |
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#include "AudObservers.h" |
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/* |
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* Forward declarations. |
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*/ |
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class CAudClipInfoOperation; |
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class CAudProcessor; |
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/** |
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* Utility class for getting information about audio clip files. |
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*/ |
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class CAudClipInfo : public CBase |
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|
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{ |
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|
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public: |
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|
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/* Constructors & destructor. */ |
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|
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/** |
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* Constructs a new CAudClipInfo object to get information |
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* about the specified audio clip file. The specified observer |
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* is notified when info is ready for reading. This method |
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* may leave if no resources are available to construct |
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* a new object. |
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* |
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* Possible leave codes: |
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* - <code>KErrNoMemory</code> if memory allocation fails |
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* - <code>KErrNotSupported</code> if the given file format is not supported |
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* or is invalid |
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* |
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* @param aFileName name of audio clip file |
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* @param aObserver observer to notify when info is ready for reading |
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* |
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* @return pointer to a new CAudClipInfo instance |
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*/ |
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IMPORT_C static CAudClipInfo* NewL(const TDesC& aFileName, MAudClipInfoObserver& aObserver); |
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|
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/** |
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* Constructs a new CAudClipInfo object to get information |
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* about the specified audio clip file. The constructed object |
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* is left in the cleanup stack. The specified observer |
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* is notified when info is ready for reading. This method |
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* may leave if no resources are available to construct a new |
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* object. |
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* |
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* Possible leave codes: |
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* - <code>KErrNoMemory</code> if memory allocation fails |
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* - <code>KErrNotSupported</code> if the given file format is not supported |
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* or is invalid |
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* |
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* @param aFileName name of video clip file |
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* @param aObserver observer to notify when info is ready for reading |
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* |
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* @return pointer to a new CAudClipInfo instance |
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*/ |
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IMPORT_C static CAudClipInfo* NewLC(const TDesC& aFileName, MAudClipInfoObserver& aObserver); |
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/** |
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* Returns the properties of this audio file |
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* |
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* @return properties |
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*/ |
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IMPORT_C TAudFileProperties Properties() const; |
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/** |
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* Generates a visualization of the current clip. |
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* |
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* Asynchronous operation; MAudVisualizationObserver::NotifyClipVisualizationCompleted |
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* is called as soon as the visualization process has completed. This method leads to |
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* memory reservation, so once NotifyClipVisualizationCompleted has occurred, |
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* the caller is responsible for memory releasing. |
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* |
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* Possible leave codes: |
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* - <code>KErrNoMemory</code> if memory allocation fails |
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* |
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* @param aObserver observer to be notified when visualization is completed |
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* @param aSize the size of aVisualization array (time resolution). |
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* @param aPriority priority |
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* |
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*/ |
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IMPORT_C void GetVisualizationL(MAudVisualizationObserver& aObserver, |
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TInt aSize, TInt aPriority) const; |
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/** |
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* Cancels visualization generation. If no visualization is currently being |
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* generated, the function does nothing. |
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*/ |
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IMPORT_C void CancelVisualization(); |
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/** |
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* Returns the file name of the clip. Panics if info |
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* is not yet ready for reading. |
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* |
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* @return file name |
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*/ |
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IMPORT_C TPtrC FileName() const; |
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/** |
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* Destroys the object and releases all resources. |
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*/ |
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IMPORT_C ~CAudClipInfo(); |
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/** |
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* Constructs a new CAudClipInfo object to get information |
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* about the specified audio clip file. The specified observer |
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* is notified when info is ready for reading. This method |
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* may leave if no resources are available to construct |
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* a new object. |
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* |
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* Possible leave codes: |
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* - <code>KErrNoMemory</code> if memory allocation fails |
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* - <code>KErrNotSupported</code> if the given file format is not supported |
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* or is invalid |
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* |
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* @param aFileHandle file handle of audio clip file |
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* @param aObserver observer to notify when info is ready for reading |
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* |
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* @return pointer to a new CAudClipInfo instance |
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*/ |
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IMPORT_C static CAudClipInfo* NewL(RFile* aFileHandle, MAudClipInfoObserver& aObserver); |
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|
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/** |
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* Constructs a new CAudClipInfo object to get information |
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* about the specified audio clip file. The constructed object |
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* is left in the cleanup stack. The specified observer |
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* is notified when info is ready for reading. This method |
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* may leave if no resources are available to construct a new |
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* object. |
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* |
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* Possible leave codes: |
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* - <code>KErrNoMemory</code> if memory allocation fails |
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* - <code>KErrNotSupported</code> if the given file format is not supported |
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* or is invalid |
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* |
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* @param aFileHandle file handle of audio clip file |
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* @param aObserver observer to notify when info is ready for reading |
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* |
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* @return pointer to a new CAudClipInfo instance |
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*/ |
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IMPORT_C static CAudClipInfo* NewLC(RFile* aFileHandle, MAudClipInfoObserver& aObserver); |
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/** |
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* Returns the file handle of the clip. Panics if info |
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* is not yet ready for reading. |
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* |
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* @return file name |
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*/ |
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IMPORT_C RFile* FileHandle() const; |
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private: |
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// C++ constructor |
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CAudClipInfo(); |
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// ConstructL |
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// parameters: see NewL() |
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void ConstructL(const TDesC& aFileName, MAudClipInfoObserver& aObserver); |
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void ConstructL(RFile* aFileHandle, MAudClipInfoObserver& aObserver); |
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private: |
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// properties of this clip |
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TAudFileProperties* iProperties; |
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// file name of this clip |
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HBufC* iFileName; |
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// file handle of this clip |
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RFile* iFileHandle; |
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// flag to indicate whether info class is ready |
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TBool iInfoReady; |
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// operation class |
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CAudClipInfoOperation* iOperation; |
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// friends |
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friend class CAudClipInfoOperation; |
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friend class CAudClip; |
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}; |
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/** |
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* Observer for notifying that audio clip info |
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* is ready for reading. |
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* |
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*/ |
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class MProcClipInfoObserver |
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{ |
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public: |
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/** |
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* Called to notify that audio clip info is ready |
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* for reading. |
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* |
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* Possible error codes: |
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* - <code>KErrNotFound</code> if there is no file with the specified name |
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* in the specified directory (but the directory exists) |
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* - <code>KErrPathNotFound</code> if the specified directory |
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* does not exist |
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* - <code>KErrUnknown</code> if the specified file is of unknown type |
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* |
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* @param aError <code>KErrNone</code> if info is ready |
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* for reading; one of the system wide |
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* error codes if reading file failed |
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*/ |
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virtual void NotifyClipInfoReady(TInt aError) = 0; |
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}; |
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/** |
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* Internal class for reading information from the audio clip file. |
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* Implements a simple object |
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* to report to the audio clip info observer certain common error conditions |
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* that would otherwise leave. |
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*/ |
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class CAudClipInfoOperation : public CBase, |
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public MProcClipInfoObserver, |
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public MAudVisualizationObserver |
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{ |
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public: |
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/* |
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* Constructor |
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* |
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* |
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* @param aInfo CAudClipInfo class that owns this object |
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* @param aObserver observer for callbacks |
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*/ |
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static CAudClipInfoOperation* NewL(CAudClipInfo* aInfo, |
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MAudClipInfoObserver& aObserver); |
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/* |
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* Destructor |
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*/ |
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~CAudClipInfoOperation(); |
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// from base class MProcClipInfoObserver |
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void NotifyClipInfoReady(TInt aError); |
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// from base class MAudVisualizationObserver |
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void NotifySongVisualizationCompleted(const CAudSong& aSong, |
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TInt aError, |
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TInt8* aVisualization, |
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TInt aSize); |
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void NotifyClipInfoVisualizationCompleted(const CAudClipInfo& aClipInfo, |
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TInt aError, |
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TInt8* aVisualization, |
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TInt aSize); |
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void NotifySongVisualizationStarted(const CAudSong& aSong, |
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TInt aError); |
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void NotifyClipInfoVisualizationStarted(const CAudClipInfo& aClipInfo, |
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TInt aError); |
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void NotifySongVisualizationProgressed(const CAudSong& aSong, |
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TInt aPercentage); |
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void NotifyClipInfoVisualizationProgressed(const CAudClipInfo& aClipInfo, |
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TInt aPercentage); |
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/** |
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* Generates a visualization of the current clip. |
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* |
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* Asynchronous operation; MAudVisualizationObserver::NotifyClipVisualizationCompleted |
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* is called as soon as the visualization process has completed. This method leads to |
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* memory reservation, so once NotifyClipVisualizationCompleted has occurred, |
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* the caller is responsible for memory releasing. |
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* |
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* Possible leave codes: |
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* - <code>KErrNoMemory</code> if memory allocation fails |
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* |
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* @param aObserver observer to be notified when visualization is completed |
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* @param aSize the size of aVisualization array (time resolution). |
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* @param aPriority priority |
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* |
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*/ |
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void StartVisualizationL(MAudVisualizationObserver& aObserver, TInt aSize, TInt aPriority); |
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/** |
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* Cancels visualization generation. If no visualization is currently being |
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* generated, the function does nothing. |
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*/ |
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void CancelVisualization(); |
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/** |
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* Called to start getting file properties |
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* |
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* NotifyClipInfoReady is called as soon as the operation completes |
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*/ |
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void StartGetPropertiesL(); |
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private: |
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CAudClipInfoOperation(CAudClipInfo* aInfo, |
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MAudClipInfoObserver& aObserver); |
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void ConstructL(); |
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private: |
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// info class that owns this object |
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CAudClipInfo* iInfo; |
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// observer for clip info callbacks |
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MAudClipInfoObserver* iObserver; |
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// observer for visualization callbacks |
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MAudVisualizationObserver* iVisualizationObserver; |
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// processor class owned by this object |
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CAudProcessor* iProcessor; |
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friend class CAudClipInfo; |
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friend class CAudClip; |
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}; |
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#endif |