95 lines
4.4 KiB
C
95 lines
4.4 KiB
C
/*************************************************************************/
|
|
/* */
|
|
/* Language Technologies Institute */
|
|
/* Carnegie Mellon University */
|
|
/* Copyright (c) 2008 */
|
|
/* All Rights Reserved. */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to use and distribute */
|
|
/* this software and its documentation without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of this work, and to */
|
|
/* permit persons to whom this work is furnished to do so, subject to */
|
|
/* 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 */
|
|
/* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, */
|
|
/* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF */
|
|
/* 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, void *user)
|
|
{
|
|
/* 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 */
|
|
int n;
|
|
static cst_audiodev *ad = 0;
|
|
|
|
if (start == 0)
|
|
ad = audio_open(w->sample_rate,w->num_channels,CST_AUDIO_LINEAR16);
|
|
|
|
n = 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;
|
|
}
|
|
|