ref: 7c1994bd809aea4c535997c09f6703675986f98e
dir: /src/audio/au_streaming.c/
/*************************************************************************/
/* */
/* Language Technologies Institute */
/* Carnegie Mellon University */
/* Copyright (c) 2008 */
/* All Rights Reserved. */
/* */
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/* this software and its documentation without restriction, including */
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/* the following conditions: */
/* 1. The code must retain the above copyright notice, this list of */
/* conditions and the following disclaimer. */
/* 2. Any modifications must be clearly marked as such. */
/* 3. Original authors' names are not deleted. */
/* 4. The authors' names are not used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* CARNEGIE MELLON UNIVERSITY AND THE CONTRIBUTORS TO THIS WORK */
/* DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING */
/* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT */
/* SHALL CARNEGIE MELLON UNIVERSITY NOR THE CONTRIBUTORS BE LIABLE */
/* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */
/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN */
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/* THIS SOFTWARE. */
/* */
/*************************************************************************/
/* Author: Alan W Black (awb@cs.cmu.edu) */
/* Date: November 2008 */
/*************************************************************************/
/* */
/* Support for audio streaming. */
/* */
/* When switched on you get called with cst_wave with a start and size */
/* at least as big as the requested buffer size (except for last chunk */
/* */
/*************************************************************************/
#include "cst_string.h"
#include "cst_wave.h"
#include "cst_audio.h"
CST_VAL_REGISTER_TYPE(audio_streaming_info,cst_audio_streaming_info)
cst_audio_streaming_info *new_audio_streaming_info(void)
{
cst_audio_streaming_info *asi =
cst_alloc(struct cst_audio_streaming_info_struct,1);
asi->min_buffsize = 256;
asi->asc = NULL;
asi->userdata = NULL;
return asi;
}
void delete_audio_streaming_info(cst_audio_streaming_info *asi)
{
if (asi)
cst_free(asi);
return;
}
int audio_stream_chunk(const cst_wave *w, int start, int size,
int last, cst_audio_streaming_info *asi)
{
/* Called with new samples from start for size samples */
/* last is true if this is the last segment. */
/* This is really just and example that you can copy for you streaming */
/* function */
/* This particular example is *not* thread safe */
static cst_audiodev *ad = 0;
if (start == 0)
ad = audio_open(w->sample_rate,w->num_channels,CST_AUDIO_LINEAR16);
audio_write(ad,&w->samples[start],size*sizeof(short));
if (last == 1)
{
audio_close(ad);
ad = NULL;
}
/* if you want to stop return CST_AUDIO_STREAM_STOP */
return CST_AUDIO_STREAM_CONT;
}