Examples of net.fec.openrq.parameters.FECParameters

net.fec.openrq.parameters.FECParameters
This class represents FEC parameters as defined in RFC 6330 as the Encoded FEC Object Transmission Information (OTI), which contains the Encoded Common FEC OTI and the Encoded Scheme-Specific FEC OTI.
The FEC parameters consist of:

Source data length

The length of the source data, in number of bytes. Since encoded data may contain extra padding bytes, this value allows a decoder to infer the real size of the decoded data.

Symbol size

The size of a symbol, in number of bytes. This value represents the size of an encoding symbol (source or repair), except the size of the last source symbol, which may be smaller.

Number of source blocks

The number of source blocks into which the source data is partitioned. Each source block is encoded/decoded independently, and not every one is divided into the same number of source symbols.

Interleaver length

The number of sub-blocks per source block into which the source data is interleaved. This value influences the level of uniform interleaving used before encoding a source block. A value of 1 means no interleaving is used, and a higher value means more interleaving per source block. Interleaving refers to a burst-error correction technique in FEC codes.

Symbol alignment

This value has no relevance to the user of OpenRQ, since it is fixed to a value of 1. This parameter exists here only for compliance to the RFC 6330.

Methods are provided to write instances of this class to arrays of bytes, {@link ByteBuffer} objects, serializableobjects, {@link DataOutput} objects and {@link WritableByteChannel} objects. Additionally, static methods areprovided to parse/read instances of this class from arrays of bytes, {@code ByteBuffer} objects, serializableobjects, {@link DataInput} objects and {@link ReadableByteChannel} objects.

        @Test(expected = IndexOutOfBoundsException.class)
        public void test_IOOBE_largeOffset() {


            final byte[] data = new byte[1];
            final int offset = 1;
            final FECParameters fecParams = PARAMS_WITH_DATA_LENGTH_OF_1;


            OpenRQ.newEncoder(data, offset, fecParams);
        }

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        @Test(expected = IndexOutOfBoundsException.class)
        public void test_IOOBE_dataLength() {


            final byte[] data = new byte[1];
            final int offset = 0;
            final FECParameters fecParams = PARAMS_WITH_DATA_LENGTH_OF_2;


            OpenRQ.newEncoder(data, offset, fecParams);
        }

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    public static final class NewDecoder {


        @Test
        public void testNoExceptions() {


            final FECParameters fecParams = TestingCommon.Minimal.fecParameters();
            final int extraSymbols = 0;


            OpenRQ.newDecoder(fecParams, extraSymbols);
        }

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        }


        @Test(expected = NullPointerException.class)
        public void test_NPE() {


            final FECParameters fecParams = null;
            final int extraSymbols = 0;


            OpenRQ.newDecoder(fecParams, extraSymbols);
        }

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        }


        @Test(expected = IllegalArgumentException.class)
        public void test_IAE_dataLength() {


            final FECParameters fecParams = PARAMS_WITH_DATA_LENGTH_OF_INTMAXPLUS1;
            final int extraSymbols = 0;


            OpenRQ.newDecoder(fecParams, extraSymbols);
        }

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        }


        @Test(expected = IllegalArgumentException.class)
        public void test_IAE_negExtraSymbols() {


            final FECParameters fecParams = TestingCommon.Minimal.fecParameters();
            final int extraSymbols = -1;


            OpenRQ.newDecoder(fecParams, extraSymbols);
        }

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        TestingCommon.checkParamsForSingleSourceBlockData(F, K);
        if (overhead < 0) throw new IllegalArgumentException("symbol overhead must be non-negative");


        // force single source block
        final FECParameters fecParams = FECParameters.newParameters(F, ceilDiv(F, K), 1);
        final Random rand = TestingCommon.newSeededRandom();


        final byte[] data = TestingCommon.randomBytes(F, rand);
        final int numESIs = K + overhead;
        final Set<Integer> esis = randomESIs(rand, K, numESIs);

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    private static ArraySourceBlockEncoder newSBEncoder(int F, int K) {


        TestingCommon.checkParamsForSingleSourceBlockData(F, K);


        // force single source block
        final FECParameters fecParams = FECParameters.newParameters(F, ceilDiv(F, K), 1);
        final Random rand = TestingCommon.newSeededRandom();


        final byte[] data = TestingCommon.randomBytes(F, rand);
        return (ArraySourceBlockEncoder)OpenRQ.newEncoder(data, fecParams).sourceBlock(0);
    }

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Related Classes of net.fec.openrq.parameters.FECParameters

net.fec.openrq.OpenRQClassTest$NewDecoder

net.fec.openrq.OpenRQClassTest$NewEncoder

net.fec.openrq.OpenRQClassTest$NewEncoderOffset

net.fec.openrq.SourceBlockDecodingTest

net.fec.openrq.SourceBlockEncodingTest

java.nio.ByteBuffer

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