Kontron KTAM3874-pITX - Manual (Page 114)

KTD-S0057-I Page 110 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
static void set_wav_header (wav_header *w)
{
strcpy (w->chunkId, "RIFF");
w->chunkSize = BUFSIZE + sizeof (wav_header) - 8;
strcpy (w->format, "WAVE");
strcpy (w->subChunkId, "fmt ");
w->subChunkSize = 16; /* Length of sub-header - 8 */
w->audioFormat = FMT_PCM; /* PCM, uncompressed */
w->numChannels = MONO;
w->sampleRate = RATE_44kHz;
w->byteRate = RATE_44kHz * (SAMPLEBITS / 8) * w->numChannels; /* only valid for 8, 16 and 24 bits */
w->blockAlign = (SAMPLEBITS / 8) * w->numChannels; /* only valid for 8, 16 and 24 bits */
w->bitsPerSample = SAMPLEBITS;
strcpy (w->subChunkId2, "data");
w->subChunkSize2 = BUFSIZE;
}
static int write_wav_file (wav_header w)
{
FILE
*wavfile;
wavfile = fopen (FILENAME, "w");
if (! wavfile)
return EXIT_FAILURE;
if (fwrite (&w, sizeof (wav_header), 1, wavfile) != 1)
return EXIT_FAILURE;
if (fwrite (&buf, sizeof (short), FRAMES, wavfile) != FRAMES)
return EXIT_FAILURE;
fclose(wavfile);
return
EXIT_SUCCESS;
}
int main (void)
{
int
err;
unsigned int rrate;
wav_header wavhdr;
snd_pcm_t *capture_handle;
snd_pcm_hw_params_t *hw_params;
if ((err = snd_pcm_open (&capture_handle, device, SND_PCM_STREAM_CAPTURE, 0)) < 0)
{
fprintf (stderr, "Cannot open audio device %s (%s)\n", device, snd_strerror (err));
return EXIT_FAILURE;
}
if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0)
{
fprintf (stderr, "Cannot allocate hardware parameter structure (%s)\n", snd_strerror (err));
return EXIT_FAILURE;
}