ad_openal.c
/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
* Copyright (c) 1999-2014 Carnegie Mellon University. All rights
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* This work was supported in part by funding from the Defense Advanced
* Research Projects Agency and the National Science Foundation of the
* United States of America, and the CMU Sphinx Speech Consortium.
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#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include "ad.h"
#include <al.h>
#include <alc.h>
struct ad_rec_s {
ALCdevice * device;
};
ad_rec_t *
ad_open_dev(const char * dev, int32 samples_per_sec)
{
ad_rec_t * handle = malloc(sizeof(ad_rec_t));
if (handle == NULL) {
fprintf(stderr, "%s\n", "failed to allocate memory");
abort();
}
handle -> device = alcCaptureOpenDevice(dev, samples_per_sec, AL_FORMAT_MONO16, samples_per_sec * 10);
if (handle -> device == NULL) {
free(handle);
fprintf(stderr, "%s\n", "failed to open capture device");
abort();
}
return handle;
}
ad_rec_t *
ad_open_sps(int32 samples_per_sec)
{
return ad_open_dev(NULL, samples_per_sec);
}
ad_rec_t *
ad_open(void)
{
return ad_open_sps(DEFAULT_SAMPLES_PER_SEC);
}
int32
ad_start_rec(ad_rec_t * r)
{
alcCaptureStart(r -> device);
return 0;
}
int32
ad_stop_rec(ad_rec_t * r)
{
alcCaptureStop(r -> device);
return 0;
}
int32
ad_read(ad_rec_t * r, int16 * buf, int32 max)
{
ALCint number;
alcGetIntegerv(r -> device, ALC_CAPTURE_SAMPLES, sizeof(number), &number);
if (number >= 0) {
number = (number < max ? number : max);
alcCaptureSamples(r -> device, buf, number);
}
return number;
}
int32
ad_close(ad_rec_t * r)
{
ALCboolean isClosed;
isClosed = alcCaptureCloseDevice(r -> device);
if (isClosed) {
return 0;
} else {
return -1;
}
}
ad.h
generic live audio interface for recording and playback
ad_open_dev
SPHINXBASE_EXPORT ad_rec_t * ad_open_dev(const char *dev, int32 samples_per_sec)
Open a specific audio device for recording.
Definition ad_alsa.c:187
ad_open
SPHINXBASE_EXPORT ad_rec_t * ad_open(void)
Open the default audio device.
Definition ad_alsa.c:228
ad_open_sps
SPHINXBASE_EXPORT ad_rec_t * ad_open_sps(int32 samples_per_sec)
Open the default audio device with a given sampling rate.
Definition ad_alsa.c:222
ad_rec_s
Audio recording structure.
Definition ad_alsa.c:90
ad_rec_t
Audio recording structure.