Kontron KTAM3874-pITX - Manual (Page 113)

KTD-S0057-I Page 109 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
The following sourcecode introduces a simple program for recording (capturing) and stores the data in a
WAV-file.
/***************************************************************
* Capture demo program
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
****************************************************************/
#include <stdio.h>
#include <stdint.h>
#include <alsa/asoundlib.h>
#define FILENAME "test.wav"
#define FRAMES 0x8000
#define MONO 1
#define STEREO 2
#define BUFSIZE FRAMES * MONO
#define FMT_PCM 1
#define RATE_44kHz 44100
#define RATE_48kHz 48000
#define SAMPLEBITS 16
static char *device = "plughw:0,0";
static short buf[BUFSIZE];
typedef struct {
char
chunkId[4];
uint32_t chunkSize;
char format[4];
char subChunkId[4];
uint32_t subChunkSize;
uint16_t audioFormat;
uint16_t numChannels;
uint32_t sampleRate;
uint32_t byteRate;
uint16_t blockAlign;
uint16_t bitsPerSample;
char subChunkId2[4];
uint32_t subChunkSize2;
} wav_header;