Copyright © 2008-2014 MultiMedia Soft

How to use the control in your projects

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First of all let us say that if this guide should not be clear to you, feel free to contact our support team for any doubt or curiosity you may have: we usually answer all of our customers questions in less than 24 hours. Note that the purpose of this guide is to give a taste of the main features available inside Active Sound Editor.

 

As an integration to this guide some example of use of this component, in Visual Basic 6 and Visual C++ languages, can be found inside the "Samples" folder: if during the setup phase you left the installation directory to its default, you will find them inside "C:\Program Files\Active Sound Editor\Samples".

 

The first needed step is to add the control to your project: see the Adding the control to a project section for details.

 

Before starting sound editing management, the component needs to be initialised: for this purpose it's mandatory a call to the InitEditor method; the best place to call this initialisation method is usually the container form initialisation function: for example, when using Visual Basic 6, it will be the Form_Load subroutine. The main purpose of calling the InitEditor method is to synchronise the component with its container form.

 

After the control's initialization we should decide if the sound under editing will be stored in memory or inside a temporary file: this can be done through the GetStoreMode and SetStoreMode methods; it's important to note that the sound under editing will be always stored in uncompressed WAV PCM format so its total size could become an issue when dealing with low-end systems:

 

when stored in memory, it will be possible getting the pointer to the memory buffer containing WAV PCM data through the GetMemoryPtr64 method and the total size in bytes of the memory buffer through the GetMemorySize method: it's strongly suggested avoiding memory based storage for clips longer than 10 minutes.
when stored inside a temporary file, it will be possible getting its absolute pathname through the GetTempFilePathname method and its total size in bytes through the GetTempFileSize64 method.

 

At this point we can load a sound for editing purposes from different sources:

 

from a disk file through the LoadSound or LoadSoundFromRawFile methods; the most diffused file formats are supported. In case the file to load should be a multi-channel one, like 5.1 or 7.1, you could keep existing channels separated by invoking the MultiChannelLoadingModeSet method with the nMode parameter set to MULTICHAN_DOWNMIX_NONE: without this call the source audio file will be automatically converted to stereo during the loading procedure.
from a file, previously encrypted through our CryptSound™ application, through the LoadSoundEncrypted method.
from a memory buffer through the LoadSoundFromMemory or LoadSoundFromRawMemory methods; the most diffused file formats are supported.
from the system Clipboard through the LoadSoundFromClipboard method: the availability of a sound inside the Clipboard can be detected calling the IsSoundAvailableInClipboard method.
from another instance of Active Sound Editor through the LoadSoundFromEditingSession method.
from a recording session activated by an instance of our Active Sound Recorder ActiveX control through the LoadSoundFromRecordingSession method.
from an entry of a ZIP file through the LoadSoundFromZip method
from an external source which provides raw audio data by invoking the RawAudioFromExternalSourceStart method, followed by a number of calls to the RawAudioFromExternalSourcePush method, which allows storing raw audio data, and finally by invoking the RawAudioFromExternalSourceStop method which allows loading received raw audio data into the editor

 

A loading session can be canceled through the LoadSoundCancel method.

 

By default, each of the mentioned loading methods will create a new editing session discarding the existing one: this behaviour can be modified through the SetLoadingMode method which allows loading a new sound without discarding the existing editing session and to perform one of the following operations:

 

Append the loaded sound to the existing editing session.
Insert the loaded sound at a given position within the existing editing session: the insertion position must be previously set through the SetInsertPos method.
Mix the loaded sound at a given position within the existing editing session: the mixing position must be previously set through the SetMixingPos method; it's important to note that, during the mixing phase, you can separately modify the volume of the loaded sound and the volume of the existing editing session through a previous call to the SetMixingParams method: as a further feature this method allows putting the loaded sound in loop over a given range of the existing editing session.
Overwrite the existing editing session with the loaded sound: the overwrite position must be previously set through the SetOverwritePos method.

 

As a further loading feature, you can limit the range of sound data that will be loaded from the given sound file with a previous call to the SetLoadingRange method, a useful feature if you want to extract a small portion of an existing sound file for editing purposes.

 

Information about the loaded sound file, for example the audio format, can be retrieved through the GetFileType and GetFileInfo methods.

 

Further editing features, applicable to the whole editing session or to a specific range, can be summarized by the following list:

 

Copy to the clipboard through the CopyRangeToClipboard method.
Delete through the DeleteRange method.
Delete of portions outside of a given range through ReduceToRange method.
Silence insertion through the InsertSilence method.
Trim initial and final portions of silence through the TrimSilence method.

 

A certain number of special effects can be applied to the existing editing session through the Effects COM object:

 

Flat volume
Sliding volume
Volume automation
DMO (DirectX Media Object) effects
Internal and External Custom DSP effects
Commercial and freeware VST effects
Reverse sound
Tempo change
Playback rate change
Pitch change
IIR and FIR filters
Vocal removal filter
Normalization
DC Offset removal

 

Basic noise removal is also supported for the following kind of noises:

 

Pops and Clicks removal
Hiss noise removal

 

See the How to perform noise removal tutorial for further details.

 

During the editing session the WaveformAnalyzer COM object allows performing a deep analysis and detailed graphical visualization, with zooming and panning capabilities, of the sound's waveform.

An editing session can be canceled through the EditSoundCancel method.

 

Contents of the editing session can be exported to an output file through the ExportToFile method. The encoding format used for the output file can be set through the EncodeFormats.FormatToUse property and settings specific for each available sound format can be set through the available sub-properties of the EncodeFormats property: if for example you need to export in MP3 format, you will have to deal with properties and methods available inside the EncodeFormats.MP3 property.

 

A basic playback system is also available in order to play the current content of the editing session; available methods are the following:

 

PlaySound and PlaySoundRange
PauseSound
ResumeSound
StopSound
GetPlaybackPosition

 

If you should need more sophisticated playback features, for example displaying visual feedbacks (VU-Meter, Spectrum, etc.) during playback, you should consider using Active Sound Editor in conjunction with our Active DJ Studio ActiveX control which comes with a method, named LoadSoundFromEditingSession, that allows loading and playing back contents of an editing session.

 

Through the SilencePositionsDetect method, the control supports Silence detection, a feature which allows detecting positions of silent portions inside the loaded sound and store them inside a list. The list of detected silent portions can be enumerated at a later time through the SilencePositionsGetNum and SilencePositionsGetRange methods.

Silence detection can be canceled at any time through the SilencePositionsCancelDetect method.

 

Finally, an editing session can be closed and its contents discarded from memory through a call to the CloseSound method.

 

Further capabilities of the control, not directly related to sound editing, are the following:

 

the JoinFilesFromDisk method allows joining two mono sound files into one single stereo output sound file.
the ExtractAudioFromVideoFile method allows extracting the audio track from a video clip and to store it inside an output sound file that may be used later for further editing.
Conversion of sound files from an audio format to another one with the possibility to keep existing tags and to apply normalization and DC Offset removal: see the How to convert the format of sound files tutorial for details.

 

 

An important topic to keep count of is how synchronization between the container application and events generated by this control works: see the How to synchronize the container application with the control tutorial for further details.