Operator RtpDecode

The RtpDecode Operator converts an input blob with 8-bit μ-law encoded PCM samples into uncompressed 16-bit samples. The output stream attribute with the 16-bit samples must be of type blob and the 16-bit samples are stored in little endian signed integer format.

Example


use com.teracloud.streams.network.rtp::RtpDecode;
composite Main {
  param
    expression<rstring> $filename: getSubmissionTimeValue("filename", "data/sample_rtp_decode_basic_ulaw.gsm" );
  graph
    stream<rstring filename, blob mulawspeech> MuLawSamplesStream = FileSource() {
      param
        file: $filename;
        format: block;
        blockSize: 128u;
      output MuLawSamplesStream:
        filename = $filename;
    }
    
    stream<rstring filename, blob mulawspeech, blob decoded, uint64 noSamples, rstring conversationId> OutStream  = RtpDecode(MuLawSamplesStream) {
      param
        payload: mulawspeech;
      output OutStream:
        conversationId = filename,
        decoded = getPcmPayload(),
        noSamples = getNumberOfSamples();
    }
}

Summary

Ports: This operator has 1 input port and 1 output port.
Windowing: This operator does not accept any windowing configurations.
Parameters: This operator supports 1 parameter.
Required: payload
Metrics: This operator does not report any metrics.

Properties

Implementation: C++
Threading: Always - Operator always provides a single threaded execution context.

Input Ports

Ports (0)

The input port with an blob attribute containing the PCM samples.

Properties

Optional: false

Output Ports

Assignments: This operator allows any SPL expression of the correct type to be assigned to output attributes.

Output Functions

DefaultFunctions

<any T> T AsIs(T)

The default function for output attributes. By default, this function assigns the output attribute to the value of the input attribute with the same name.

uint64 getNumberOfSamples()

Return the number of converted PCM samples in the current tuple.

blob getPcmPayload()

Return the converted PCM payload (uncompressed 16-bit little endian integer samples).

Ports (0)

The output port with an blob attribute containing the converted PCM samples. The other attributes are auto assigned from input port to output port.

Properties

Optional: false

TupleMutationAllowed: true
WindowPunctuationOutputMode: Preserving

Parameters

This operator supports 1 parameter.

Required: payload

payload

The input stream attribute with the 8 bit mulaw encoded PCM samples to convert.

Properties

Type: blob
Cardinality: 1
Optional: false
ExpressionMode: Attribute

Code Templates

RtpDecode


stream<${outputSchema}> ${outputStream} = com.teracloud.streams.network.rtp::RtpDecode(${inputStream}) {
  param
      payload: ${inputStream-blob-attribute};
  output
      ${outputStream}: ${attributeAssignments}
}