Methods > Recorders > StartSplitFromURL method

Remarks

Starts a new recording session from a sound stream pointed by an Internet URL and splits incoming sound in left and right channels. The source stream can be either a shoutcast/icecast stream or simply a sound file stored on a web site.

When calling this method the container application is notified about the status of the connection to the given Internet URL through the CallbackForRecordersEvents delegate, invoked with the nEvent parameter set to EV_REC_CONNECTION_STARTED and EV_REC_CONNECTION_DONE.

Once connected successfully, the container application is notified through the CallbackForRecordersEvents delegate invoked with the nEvent parameter set to EV_REC_START.

The recording session can be stopped at any time through a call to the RecorderStop method.

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.

Limitations to encoding capabilities when splitting the recording session

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.

When the stereo recording session is encoded in MP3, Ogg Vorbis or Opus audio formats, respective external encoders (Lame, OggEnc and OpusEnc) must be available on the target system because internal encoders cannot manage the "downmix" to mono of the split channels.

For details about recording from the Internet see the How to perform an Internet-based recording session section.

Syntax

[Visual Basic]

Public Function StartSplitFromURL (

strOutputPathLeft as string,

strOutputPathRight as string,

strURL as string

) as enumErrorCodes

[C#]

public enumErrorCodes StartSplitFromURL (

string strOutputPathLeft,

string strOutputPathRight,

string strURL

);

[C++]

public: enumErrorCodes StartSplitFromURL (

string strOutputPathLeft,

string strOutputPathRight,

string strURL

);

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.
strURL	String representing the Internet URL (HTTP, FTP or MMS) pointing to the sound stream or file. Accepted formats are WMA, MP3, OGG Vorbis, AAC and AC3.

Return value

Value	Meaning

Negative value	An error occurred. Check the LastError property value in order to see the last error.
enumErrorCodes.ERR_NOERROR (0)	The method call was successful.