ad_pulse.c
/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
* Copyright (c) 1999-2011 Carnegie Mellon University. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
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*
* 1. Redistributions of source code must retain the above copyright
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* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
* NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
/* Input for Pulseaudio */
#include <stdio.h>
#include <string.h>
#include <config.h>
#include <pulse/pulseaudio.h>
#include <pulse/simple.h>
#include "prim_type.h"
#include "ad.h"
#define DEFAULT_DEVICE NULL
struct ad_rec_s {
pa_simple* pa;
int32 recording;
int32 sps;
int32 bps;
};
ad_rec_t *
ad_open_dev(const char *dev, int32 samples_per_sec)
{
ad_rec_t *handle;
pa_simple *pa;
pa_sample_spec ss;
int error;
ss.format = PA_SAMPLE_S16LE;
ss.channels = 1;
ss.rate = 16000;
pa = pa_simple_new(NULL, "ASR", PA_STREAM_RECORD, dev, "Speech", &ss, NULL, NULL, &error);
if (pa == NULL) {
fprintf(stderr, "Error opening audio device %s for capture: %s\n", dev, pa_strerror(error));
return NULL;
}
if ((handle = (ad_rec_t *) calloc(1, sizeof(ad_rec_t))) == NULL) {
fprintf(stderr, "Failed to allocate memory for ad device\n");
return NULL;
}
handle->pa = pa;
handle->recording = 0;
handle->sps = samples_per_sec;
handle->bps = sizeof(int16);
return handle;
}
ad_rec_t *
ad_open_sps(int32 samples_per_sec)
{
return ad_open_dev(DEFAULT_DEVICE, 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)
{
if (r->recording)
return AD_ERR_GEN;
r->recording = 1;
return 0;
}
int32
ad_stop_rec(ad_rec_t * r)
{
if (!r->recording)
return AD_ERR_GEN;
r->recording = 0;
return 0;
}
int32
ad_read(ad_rec_t * r, int16 * buf, int32 max)
{
int error;
if (!r->recording)
return AD_EOF;
if (max > 2048) {
max = 2048;
}
if (pa_simple_read(r->pa, (void*)buf, max * 2, &error) < 0) {
fprintf(stderr, "Failed to read speech: %s\n", pa_strerror(error));
}
return max;
}
int32
ad_close(ad_rec_t * r)
{
if (r->pa == NULL)
return AD_ERR_NOT_OPEN;
if (r->recording) {
if (ad_stop_rec(r) < 0)
return AD_ERR_GEN;
}
pa_simple_free(r->pa);
free(r);
return 0;
}
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
prim_type.h
Basic type definitions used in Sphinx.
ad_rec_s
Audio recording structure.
Definition ad_alsa.c:90
ad_rec_s::sps
int32 sps
Samples/sec.
Definition ad_alsa.c:93
ad_rec_s::bps
int32 bps
Bytes/sample.
Definition ad_alsa.c:94
ad_rec_t
Audio recording structure.