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Android Reference

UlawEncoderInputStream


android.speech.srec

Class UlawEncoderInputStream

  • All Implemented Interfaces:
    Closeable, AutoCloseable


    public final class UlawEncoderInputStream
    extends InputStream
    InputStream which transforms 16 bit pcm data to ulaw data. Not yet ready to be supported, so
    • Constructor Summary

      Constructors
      Constructor and Description
      UlawEncoderInputStream(InputStream in, int max)
      Create an InputStream which takes 16 bit pcm data and produces ulaw data.
    • Method Summary

      Methods
      Modifier and Type Method and Description
      int available()
      Returns an estimated number of bytes that can be read or skipped without blocking for more input.
      void close()
      Closes this stream.
      static void encode(byte[] pcmBuf, int pcmOffset, byte[] ulawBuf, int ulawOffset, int length, int max)
      static int maxAbsPcm(byte[] pcmBuf, int offset, int length)
      Compute the maximum of the absolute value of the pcm samples.
      int read()
      Reads a single byte from this stream and returns it as an integer in the range from 0 to 255.
      int read(byte[] buf)
      Equivalent to read(buffer, 0, buffer.length).
      int read(byte[] buf, int offset, int length)
      Reads at most length bytes from this stream and stores them in the byte array b starting at offset.
    • Constructor Detail

      • UlawEncoderInputStream

        public UlawEncoderInputStream(InputStream in,
                              int max)
        Create an InputStream which takes 16 bit pcm data and produces ulaw data.
        Parameters:
        in - InputStream containing 16 bit pcm data.
        max - pcm value corresponding to maximum ulaw value.
    • Method Detail

      • encode

        public static void encode(byte[] pcmBuf,
                  int pcmOffset,
                  byte[] ulawBuf,
                  int ulawOffset,
                  int length,
                  int max)
      • maxAbsPcm

        public static int maxAbsPcm(byte[] pcmBuf,
                    int offset,
                    int length)
        Compute the maximum of the absolute value of the pcm samples. The return value can be used to set ulaw encoder scaling.
        Parameters:
        pcmBuf - array containing 16 bit pcm data.
        offset - offset of start of 16 bit pcm data.
        length - number of pcm samples (not number of input bytes)
        Returns:
        maximum abs of pcm data values
      • read

        public int read(byte[] buf,
               int offset,
               int length)
                 throws IOException
        Description copied from class: InputStream
        Reads at most length bytes from this stream and stores them in the byte array b starting at offset.
        Overrides:
        read in class InputStream
        Parameters:
        buf - the byte array in which to store the bytes read.
        offset - the initial position in buffer to store the bytes read from this stream.
        length - the maximum number of bytes to store in b.
        Returns:
        the number of bytes actually read or -1 if the end of the stream has been reached.
        Throws:
        IOException - if the stream is closed or another IOException occurs.
      • read

        public int read()
                 throws IOException
        Description copied from class: InputStream
        Reads a single byte from this stream and returns it as an integer in the range from 0 to 255. Returns -1 if the end of the stream has been reached. Blocks until one byte has been read, the end of the source stream is detected or an exception is thrown.
        Specified by:
        read in class InputStream
        Returns:
        the byte read or -1 if the end of stream has been reached.
        Throws:
        IOException - if the stream is closed or another IOException occurs.
      • close

        public void close()
                   throws IOException
        Description copied from class: InputStream
        Closes this stream. Concrete implementations of this class should free any resources during close. This implementation does nothing.
        Specified by:
        close in interface Closeable
        Specified by:
        close in interface AutoCloseable
        Overrides:
        close in class InputStream
        Throws:
        IOException - if an error occurs while closing this stream.
      • available

        public int available()
                      throws IOException
        Description copied from class: InputStream
        Returns an estimated number of bytes that can be read or skipped without blocking for more input.

        Note that this method provides such a weak guarantee that it is not very useful in practice.

        Firstly, the guarantee is "without blocking for more input" rather than "without blocking": a read may still block waiting for I/O to complete — the guarantee is merely that it won't have to wait indefinitely for data to be written. The result of this method should not be used as a license to do I/O on a thread that shouldn't be blocked.

        Secondly, the result is a conservative estimate and may be significantly smaller than the actual number of bytes available. In particular, an implementation that always returns 0 would be correct. In general, callers should only use this method if they'd be satisfied with treating the result as a boolean yes or no answer to the question "is there definitely data ready?".

        Thirdly, the fact that a given number of bytes is "available" does not guarantee that a read or skip will actually read or skip that many bytes: they may read or skip fewer.

        It is particularly important to realize that you must not use this method to size a container and assume that you can read the entirety of the stream without needing to resize the container. Such callers should probably write everything they read to a ByteArrayOutputStream and convert that to a byte array. Alternatively, if you're reading from a file, File.length() returns the current length of the file (though assuming the file's length can't change may be incorrect, reading a file is inherently racy).

        The default implementation of this method in InputStream always returns 0. Subclasses should override this method if they are able to indicate the number of bytes available.

        Overrides:
        available in class InputStream
        Returns:
        the estimated number of bytes available
        Throws:
        IOException - if this stream is closed or an error occurs


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