Methods > Recorders > StartSplitFromFileRaw method

Remarks

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

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.StartSplitFromFileRaw (

strOutputPathLeft as string,

strOutputPathRight as string,

strInputPath as string,

nEncodeMode as enumRAWEncodeModes,

bIsBigEndian as enumBoolean,

nFrequency as Long,

nChannels as Long

) as enumErrorCodes

[C++]

short control.StartSplitFromFileRaw (

LPCTSTR strOutputPathLeft,

LPCTSTR strOutputPathRight,

short nEncodeMode,

short bIsBigEndian,

long nFrequency,

long nChannels

);

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 file.

nEncodeMode

Encode mode used to encode the RAW file.

Supported values are the following:

Mnemonic constant	Value	Meaning
RAW_ENCODE_PCM_U8	0	RAW PCM 8 bits Unsigned
RAW_ENCODE_PCM_S8	1	RAW PCM 8 bits Signed
RAW_ENCODE_PCM_S16	2	RAW PCM 16 bits Signed
RAW_ENCODE_PCM_S24	3	RAW PCM 24 bits Signed
RAW_ENCODE_PCM_S32	4	RAW PCM 32 bits Signed
RAW_ENCODE_FLOAT32	5	RAW 32 bits floating point
RAW_ENCODE_G711_ULAW	6	RAW G711 U-LAW
RAW_ENCODE_G711_ALAW	7	RAW G711 A-LAW
RAW_ENCODE_GSM_610	8	RAW GSM 6.10
RAW_ENCODE_DIALOGIC_VOX	9	RAW Dialogic ADPCM VOX

bIsBigEndian

Boolean flag that specifies if bits order inside the RAW file are little-endian or big-endian

Supported values are the following:

Mnemonic Value	Meaning
BOOL_FALSE	The RAW file is encoded using little-endian
BOOL_TRUE	The RAW file is encoded using big-endian

nFrequency

Sample rate of the RAW file (e.g. 44100)

nChannels

Number of channels of the RAW file: must be set to 2 for stereo because splitting of mono files is not supported.

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.