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# LangIdBndStream

The `LangIdBndStream` task receives audio data as a binary stream, converts it into language identification features, and determines boundaries where the language changes. It returns the language identification results between boundaries.

## Parameters

Parameter | Description | Required
--- | --- | ---
Type | The task name. Set to `LangIdBndStream`. | Yes
Beam | The beam width of the search process. |
ClassList | A list of language classifiers to use. |
ClassPath | The path to the directory containing the language classifiers. |
DnnFile | The Deep Neural Network acoustic modeling file to use. |
Lang | The name of the language pack to use. | Yes
LangList | A subset of languages to use from the classifier list file. |
MinPhoneRate | The minimum phone rate (phones per second). |
Mode | The algorithm mode for the speech-to-text process. |
NBest | The maximum number of language candidates to include in the output file. |
Out | The file to write language identification results to. | Yes
OutB | The file to write boundary point information to. | Yes
SegSize | The maximum results segment size. |
SegSmoothWin | The size of the smoothing window. |
SegStep | The step size in phones of the analysis window. |
SilThresh | The threshold between what the task identifies as silence and non-silence. |
SpeechThresh | The threshold between speech and non-speech (music or noise). |

Note: The `ClassList` parameter is required only if you want to change the audio sample rate, or if you want to use your own custom classifiers. You might also need to specify the `ClassPath` parameter, depending on the location of the classifier files.

## Example

    http://localhost:13000/action=AddTask&Type=LangIdBndStream&ClassList=ListManager/OptClassSet&ClassPath=C:\LangID\&Out=SpeechLang1.ctm&OutB=SpeechBnd.ctm

This action uses port `13000` to instruct Speech Server, which is located on the local machine, to identify languages and language boundaries in the audio stream using the language classifiers specified in the `OptClassSet` list. The action instructs IDOL Speech Server to write the identification results to the `SpeechLang1.ctm` file and the boundary information to the `SpeechBnd.ctm` file.

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