Methods > Recorders > StartSplitFromFile method

Remarks

Starts a new recording session from an input stereo sound file and splits incoming sound in left and right channels.

Accepted stream formats are: MP1, MP2, MP3, MP4 (***), AIFF, AAC, M4A, AC3, FLAC, WavPack, ALAC, WAV, OGG Vorbis, OPUS, WMA (*), ASF (**), WMV (**), AIFF, AU, W64, PAF, SVX, NIST, VOC, IRCAM, PVF and CAF.

Source sound files cannot be in mono and multi-channel WAV, AIFF, OGG Vorbis, OPUS and WMA formats are not supported and will be resampled and converted to stereo during the loading procedure.

Accepted MOD formats are: MOD, MTM, S3M, XM, IT and MO3.

Accepted CD audio tracks format is CDA.

Sound files in various RAW formats can be loaded using the StartSplitFromFileRaw method.

A successful call to this method will fire the RecordingStarted event followed by a number of RecordingPerc events and finally by the RecordingStopped event.

In this case the recording session wouldn't be kept inside the RecordedSound object so the only accepted recording mode, set through the SetRecordingMode method, is REC_MODE_NEW.

If the EncodeFormats.ForRecording property is set to ENCODING_FORMAT_WMA, the only supported encoding mode for the EncodeFormats.WMA.EncodeMode property is WMA_ENCODE_CBR_STD_16 and the WMA.CBR property must be set to a value that can support both stereo and mono, so the only compatible combinations are the following:

•	for sounds at 16000 Hz CBR must be set to 16000 (16 kbps)

•	for sounds at 22050 Hz CBR must be set to 20000 (20 kbps)

•	for sounds at 44100 Hz CBR must be set to 32000 (32 kbps) or 48000 (48 kbps)

If the EncodeFormats.ForRecording property is set to ENCODING_FORMAT_WAV, the splitting will only work if the EncodeFormats.WAV.EncodeMode property is set to a format supporting both mono and stereo formats meaning that, for example, it will not work for mono-only formats like WAV_ENCODE_GSM_610 or WAV_ENCODE_G721_ADPCM_32.

If the EncodeFormats.ForRecording property is set to ENCODING_FORMAT_AIFF, the splitting will only work if the EncodeFormats.AIFF.EncodeMode property is set to a format supporting both mono and stereo formats meaning that, for example, it will not work for mono-only formats like AIFF_ENCODE_GSM_610.

If the EncodeFormats.ForRecording property is set to ENCODING_FORMAT_AU, the splitting will only work if the EncodeFormats.AU.EncodeMode property is set to a format supporting both mono and stereo formats meaning that, for example, it will not work for mono-only formats like AU_ENCODE_G721_ADPCM_32 or AU_ENCODE_G723_ADPCM_24 or AU_ENCODE_G723_ADPCM_40.

If the EncodeFormats.ForRecording property is set to ENCODING_FORMAT_ACM, the splitting will only work if the selected codec supports both mono and stereo formats meaning that, for example, it will not work for mono-only codecs like GSM 6.10 or G721 ADPCM.

The split doesn't work if the EncodeFormats.ForRecording property is set to ENCODING_FORMAT_AAC because this format doesn't support creating mono sounds.

For details about recording from files see the How to record from files, memory or clipboard section.

Syntax

[Visual Basic]

control.StartSplitFromFile (

strOutputPathLeft as string,

strOutputPathRight as string,

strInputPath as string

) as enumErrorCodes

[C++]

short control.StartSplitFromFile (

LPCTSTR strOutputPathLeft,

LPCTSTR strOutputPathRight,

LPCTSTR strInputPath

);

Parameter	Description

strOutputPathLeft	String representing the absolute pathname of the destination file that will contain the left channel of recorded data. If this pathname should contain invalid characters, they would be automatically changed into an underscore '_' character.
strOutputPathRight	String representing the absolute pathname of the destination file that will contain the right channel of recorded data. If this pathname should contain invalid characters, they would be automatically changed into an underscore '_' character.
strInputPath	String representing the absolute pathname of the input sound file.

Return value

Value	Meaning

Negative value	An error occurred, check the LastError property value in order to see the error code meaning
enumErrorCodes.ERR_NOERROR (0)	The method call was successful.

(*) Requires Microsoft Windows Media Format modules already installed on the target PC: you can verify the presence of these modules through a call to the IsWmaAvailable method.

(**) Performs only sound tracks (no video): requires Microsoft Windows Media Format modules already installed on the target PC

(***) Performs only sound frames (no video)

The Windows Media Format modules can be installed using the redistribution setup package (wmfdist.exe) provided by Microsoft. Details about the integration of these modules inside your own setup package can be found on the following link of the official Microsoft web site (note that in the future this link could change due to the Microsoft site maintenance).