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127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/* ====================================================================
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* Copyright (c) 1999-2014 Carnegie Mellon University. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* This work was supported in part by funding from the Defense Advanced
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* Research Projects Agency and the National Science Foundation of the
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* United States of America, and the CMU Sphinx Speech Consortium.
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*
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* THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
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* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
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* NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ====================================================================
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*
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*/
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/** \file ad.h
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* \brief generic live audio interface for recording and playback
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*/
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#ifndef _AD_H_
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#define _AD_H_
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#include <sphinx_config.h>
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#include <sphinxbase/sphinxbase_export.h>
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#include <sphinxbase/prim_type.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if 0
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/* Fool Emacs. */
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}
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#endif
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#define DEFAULT_SAMPLES_PER_SEC 16000
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/* Return codes */
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#define AD_OK 0
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#define AD_EOF -1
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#define AD_ERR_GEN -1
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#define AD_ERR_NOT_OPEN -2
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#define AD_ERR_WAVE -3
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typedef struct ad_rec_s ad_rec_t;
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/**
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* Open a specific audio device for recording.
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*
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* The device is opened in non-blocking mode and placed in idle state.
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*
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* @return pointer to read-only ad_rec_t structure if successful, NULL
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* otherwise. The return value to be used as the first argument to
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* other recording functions.
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*/
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SPHINXBASE_EXPORT
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ad_rec_t *ad_open_dev (
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const char *dev, /**< Device name (platform-specific) */
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int32 samples_per_sec /**< Samples per second */
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);
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/**
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* Open the default audio device with a given sampling rate.
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*/
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SPHINXBASE_EXPORT
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ad_rec_t *ad_open_sps (
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int32 samples_per_sec /**< Samples per second */
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);
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/**
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* Open the default audio device.
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*/
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SPHINXBASE_EXPORT
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ad_rec_t *ad_open ( void );
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/* Start audio recording. Return value: 0 if successful, <0 otherwise */
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SPHINXBASE_EXPORT
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int32 ad_start_rec (ad_rec_t *);
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/* Stop audio recording. Return value: 0 if successful, <0 otherwise */
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SPHINXBASE_EXPORT
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int32 ad_stop_rec (ad_rec_t *);
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/* Close the recording device. Return value: 0 if successful, <0 otherwise */
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SPHINXBASE_EXPORT
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int32 ad_close (ad_rec_t *);
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/*
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* Read next block of audio samples while recording; read upto max samples into buf.
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* Return value: # samples actually read (could be 0 since non-blocking); -1 if not
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* recording and no more samples remaining to be read from most recent recording.
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*/
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SPHINXBASE_EXPORT
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int32 ad_read (ad_rec_t *, int16 *buf, int32 max);
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#ifdef __cplusplus
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}
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#endif
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#endif
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