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 __VEDAUDIOCLIPINFO_H__ |
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#define __VEDAUDIOCLIPINFO_H__ |
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|
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#include <f32file.h> |
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#include "VedCommon.h" |
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|
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/* |
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* Forward declarations. |
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*/ |
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class CVedAudioClipInfo; |
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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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* @see CVedAudioClipInfo |
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*/ |
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class MVedAudioClipInfoObserver |
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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 aInfo audio clip info |
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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 NotifyAudioClipInfoReady(CVedAudioClipInfo& aInfo, |
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TInt aError) = 0; |
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}; |
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/** |
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* Observer for audio clip visualization. |
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* |
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* @see CVedAudioClipInfo |
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*/ |
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class MVedAudioClipVisualizationObserver |
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{ |
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public: |
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/** |
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* Called to notify that audio clip visualization has been started. |
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* |
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* @param aInfo audio clip info |
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*/ |
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virtual void NotifyAudioClipVisualizationStarted(const CVedAudioClipInfo& aInfo) = 0; |
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|
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/** |
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* Called to inform about the current progress of the audio clip visualization. |
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* |
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* @param aInfo audio clip info |
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* @param aPercentage percentage of the operation completed, must be |
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* in range 0..100 |
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*/ |
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virtual void NotifyAudioClipVisualizationProgressed(const CVedAudioClipInfo& aInfo, |
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TInt aPercentage) = 0; |
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/** |
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* Called to notify that audio clip visualization has been completed. |
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* Note that if the visualization was successfully completed, the ownership |
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* of the visualization array is passed to the observer and the observer is |
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* responsible for freeing the array). |
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* |
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* @param aInfo audio clip info |
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* @param aError <code>KErrNone</code> if visualization was |
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* completed successfully; one of the system wide |
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* error codes if generating visualization failed |
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* @param aVisualization pointer to the array containing the visualization values; |
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* note that the ownership of the array is passed to the |
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* observer (i.e., the observer is responsible for freeing |
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* the array); or 0, if generating the visualization failed |
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* @param aResolution resolution of the visualization (i.e., the number of values |
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* in the visualization array); or 0, if generating the |
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* visualization failed |
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*/ |
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virtual void NotifyAudioClipVisualizationCompleted(const CVedAudioClipInfo& aInfo, |
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TInt aError, TInt8* aVisualization, |
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TInt aResolution) = 0; |
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}; |
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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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*/ |
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class CVedAudioClipInfo : public CBase |
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{ |
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public: |
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/* Constructors & destructor. */ |
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/** |
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* Constructs a new CVedAudioClipInfo 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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* |
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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 CVedAudioClipInfo instance |
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*/ |
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IMPORT_C static CVedAudioClipInfo* NewL(const TDesC& aFileName, |
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MVedAudioClipInfoObserver& aObserver); |
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/** |
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* Constructs a new CVedAudioClipInfo 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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* |
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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 CVedAudioClipInfo instance |
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*/ |
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IMPORT_C static CVedAudioClipInfo* NewLC(const TDesC& aFileName, |
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MVedAudioClipInfoObserver& aObserver); |
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/* Property methods. */ |
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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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virtual TPtrC FileName() const = 0; |
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/** |
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* Returns the audio type 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 audio type |
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*/ |
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virtual TVedAudioType Type() const = 0; |
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/** |
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* Returns the duration 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 duration in microseconds |
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*/ |
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virtual TTimeIntervalMicroSeconds Duration() const = 0; |
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/** |
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* Returns the channel mode of the audio if applicable. |
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* |
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* @return channel mode |
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*/ |
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virtual TVedAudioChannelMode ChannelMode() const = 0; |
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/** |
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* Returns the audio format 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 audio format of the clip |
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*/ |
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virtual TVedAudioFormat Format() const = 0; |
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/** |
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* Returns the sampling rate in hertz. |
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* |
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* @return sampling rate |
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*/ |
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virtual TInt SamplingRate() const = 0; |
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/** |
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* Returns the bitrate mode. |
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* |
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* @return bitrate mode |
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*/ |
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virtual TVedBitrateMode BitrateMode() const = 0; |
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/** |
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* Returns the bitrate. |
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* |
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* @return bitrate in bits per second |
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*/ |
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virtual TInt Bitrate() const = 0; |
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/* Visualization methods. */ |
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/** |
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* Generates a visualization of the audio clip. The visualization consists |
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* of an array of values with the specified resolution. This method is |
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* asynchronous. The visualization is generated in background and the observer |
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* is notified when the visualization is complete. This method panics if info |
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* is not yet ready for reading or the resolution is illegal. |
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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 the visualization is completed |
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* @param aResolution resolution of the visualization (i.e., the number of values |
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* in the visualization array) |
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* @param aPriority priority of the visualization |
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*/ |
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virtual void GetVisualizationL(MVedAudioClipVisualizationObserver& aObserver, |
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TInt aResolution, TInt aPriority) = 0; |
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|
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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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virtual void CancelVisualizationL() = 0; |
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|
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/** |
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* Constructs a new CVedAudioClipInfo 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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* |
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* @param aFileHandle 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 CVedAudioClipInfo instance |
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*/ |
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IMPORT_C static CVedAudioClipInfo* NewL(RFile* aFileHandle, |
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MVedAudioClipInfoObserver& aObserver); |
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/** |
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* Constructs a new CVedAudioClipInfo 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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* |
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* @param aFileHandle 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 CVedAudioClipInfo instance |
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*/ |
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IMPORT_C static CVedAudioClipInfo* NewLC(RFile* aFileHandle, |
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MVedAudioClipInfoObserver& aObserver); |
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/** |
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* Returns the file handle of the clip. Panics if there is no file |
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* associated with this clip or info is not yet ready for reading. |
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* |
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* @return file name of the clip |
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*/ |
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virtual RFile* FileHandle() const = 0; |
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|
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}; |
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#endif // __VEDAUDIOCLIPINFO_H__ |