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# AfpMatchStream

The `AfpMatchStream` task receives audio data as a binary stream, and searches it for sections that match audio indexed in an AFP database. The `AfpMatchStream` task is based on acoustic landmark matching.

## Parameters

Parameter | Description | Required
--- | --- | ---
Type | The task name. Set to `AfpMatchStream`. | Yes
AfpDb | The audio fingerprint database (if it is defined in the configuration file). | *
Delay | The delay in updating results. |
MinDuration | The minimum duration of a section that must match before that match is considered. |
MinHits | The minimum number of hits that a section of audio must generate before HPE IDOL Speech Server returns it as a match for a clip in an audio fingerprinting database. |
MinRate | The minimum hit rate threshold for audio fingerprint identification. |
NBest | The maximum number of matching AFP clips to include in the results for a section. |
Out | The file to write the search results to. | Yes
Pack | The audio fingerprint database (if it is not defined in the configuration file). | *
PackDir | The path to the directory containing the database. | *
Rnd | A window size within which a random offset shift is calculated. |
Sfreq | The sample frequency of the audio file to process. |
SpecSize | The analysis resolution. |
TimeQ | The degree of quantization to perform. |

*If the database is defined in the HPE IDOL Speech Server configuration file, you must set the AfpDb parameter. If the database is not defined, set both the Pack and PackDir parameters instead.

## Example

    http://localhost:13000/action=AddTask&Type=AfpMatchStream&Pack=Adverts&PackDir=C:\resources&Out=Results.ctm

This action uses port `13000` to instruct HPE IDOL Speech Server, which is located on the local machine, to search the audio stream for sections that match audio indexed in the `Adverts` database and to write the search results to the `Results.ctm` file.

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