itpp::SND_Out_File Class Reference

A class to write SND-files (the .au format) More...

#include <itpp/srccode/audiofile.h>

Public Member Functions
	SND_Out_File ()
	Default constructor - creates uninitialized stream.
	SND_Out_File (const char *fname, const Audio_Stream_Description &d)
	Constructor from file name fname and stream description d.
	~SND_Out_File ()
	Stream destructor.
bool	open (const char *fname, const Audio_Stream_Description &d)
	Open the file fname with stream description d.
void	close ()
	Close the file.
Audio_Stream_Description	get_description () const
	Get stream description.
bool	seek_write (std::streamoff pos)
	Set current position to write to pos (samples).
std::streamoff	tell_write ()
	Get current position in samples.
std::streamoff	num_samples () const
	Get number of samples in stream.
bool	write_sample (const double &s, int ch=0)
	Write single sample s at current position to channel ch.
bool	write_channel (const vec &v, int ch=0)
	Write the vector v to channel ch starting at current position.
bool	write (const mat &m)
	Write audio channels from columns of the matrix m starting at current position.

Detailed Description

A class to write SND-files (the .au format)

Output stream uses underlying binary stream to write audio data to the audio file in au format. Audio can be written sample-by sample, channel-wise or taken column-wise from the input matrix

Following example illustrates write operations with SND_Out_File:

#include <itpp/srccode/audiofile.h>
using namespace itpp;

int main() {
  //create stream description to store 8kHz 16-bit PCM stereo audio data
  d = Audio_Stream_Description(enc_linear16, 8000,2);
  //create audio stream
  SND_Out_File f_out("inptut.au",d);
  //fill input with 10004 Hz test tone
  mat in(100,2);
  for(int i = 0; i < 100; ++i){
    in(i,0) = sin(2*pi*i*1004/8000);
    in(i,1) = cos(2*pi*i*1004/8000);
  }
  //write audio samples
  f_out.write(in);
  //zero sample 5 in channel 0
  f_out.seek_write(5); f_out.write_sample(0,0);
  //zero samples 5..7 in channel 1
  vec z(3); z(0) = 0.0; z(1) = 0.0; z(2) = 0.0;
  f_out.seek_write(5); f_out.write_channel(z,1);

  return 0;
}

Definition at line 282 of file audiofile.h.

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The documentation for this class was generated from the following file:

• itpp/srccode/audiofile.h