Digital Signal Processing Library

Voice Lab

Program name: read_window

Language: C

In file: window_lib.c

Objective: Read a window of data.

Usage: int read_window(int **window, int window_size, int data_length, int sample_rate, FILE *input_file) ;

Parameters:

• window - Pointer to the window
• window_size - The size of the window
• data_length - The size of the data (typically 2 bytes)
• sample_rate - The number of data samples per second (typically 25K)
• input_file - The input file pointer.

• zero if read OK, -1 if error

Mathematical Description:

Comments: Routine used to read a window of data from the data file

User Comments

Code:

int read_window(int **window, int window_size, int data_length, int sample_rate, FILE *input_file)
{
        int file_pos;
        int i, data;

        /* Read the next window */
        for(i = 0; i < window_size; i++) {
                /* The read_25 routine takes into account the data width (in our case 2 bytes per INT) */
                if(read_25(input_file, data_length, sample_rate, &data) < data_length) {
                        return(-1);
                }
                /* fill window array */
                (*window)[i] = data;
        }
        return(0);
}