ref: b273a40041a0330bd1545316eed63959a6cc4bdd
dir: /src/audio/audio.c/
/*************************************************************************/
/* */
/* Language Technologies Institute */
/* Carnegie Mellon University */
/* Copyright (c) 2000 */
/* 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: October 2000 */
/*************************************************************************/
/* */
/* Access to audio devices , */
/* */
/*************************************************************************/
#include "cst_string.h"
#include "cst_wave.h"
#include "cst_audio.h"
#include "native_audio.h"
int audio_bps(cst_audiofmt fmt)
{
switch (fmt)
{
case CST_AUDIO_LINEAR16:
return 2;
case CST_AUDIO_LINEAR8:
case CST_AUDIO_MULAW:
return 1;
}
return 0;
}
cst_audiodev *audio_open(int sps, int channels, cst_audiofmt fmt)
{
cst_audiodev *ad;
int up, down;
ad = AUDIO_OPEN_NATIVE(sps, channels, fmt);
if (ad == NULL)
return NULL;
down = sps / 1000;
up = ad->real_sps / 1000;
if (up != down)
ad->rateconv = new_rateconv(up, down, channels);
return ad;
}
int audio_close(cst_audiodev *ad)
{
if (ad->rateconv)
delete_rateconv(ad->rateconv);
return AUDIO_CLOSE_NATIVE(ad);
}
int audio_write(cst_audiodev *ad,void *buff,int num_bytes)
{
void *abuf = buff, *nbuf = NULL;
int rv, i, real_num_bytes = num_bytes;
if (ad->rateconv)
{
short *in, *out;
int insize, outsize, n;
insize = real_num_bytes / 2;
in = (short *)buff;
outsize = ad->rateconv->outsize;
nbuf = out = cst_alloc(short, outsize);
real_num_bytes = outsize * 2;
while ((n = cst_rateconv_in(ad->rateconv, in, insize)) > 0)
{
in += n;
insize -= n;
while ((n = cst_rateconv_out(ad->rateconv, out, outsize)) > 0)
{
out += n;
outsize -= n;
}
}
real_num_bytes -= outsize * 2;
if (abuf != buff)
cst_free(abuf);
abuf = nbuf;
}
if (ad->real_channels != ad->channels)
{
/* Yeah, we only do mono->stereo for now */
if (ad->real_channels != 2 || ad->channels != 1)
{
cst_errmsg("audio_write: unsupported channel mapping requested (%d => %d).\n",
ad->channels, ad->real_channels);
}
nbuf = cst_alloc(char, real_num_bytes * ad->real_channels / ad->channels);
if (audio_bps(ad->fmt) == 2)
{
for (i = 0; i < real_num_bytes / 2; ++i)
{
((short *)nbuf)[i*2] = ((short *)abuf)[i];
((short *)nbuf)[i*2+1] = ((short *)abuf)[i];
}
}
else if (audio_bps(ad->fmt) == 1)
{
for (i = 0; i < real_num_bytes / 2; ++i)
{
((unsigned char *)nbuf)[i*2] = ((unsigned char *)abuf)[i];
((unsigned char *)nbuf)[i*2+1] = ((unsigned char *)abuf)[i];
}
}
else
{
cst_errmsg("audio_write: unknown format %d\n", ad->fmt);
cst_free(nbuf);
if (abuf != buff)
cst_free(abuf);
cst_error();
}
if (abuf != buff)
cst_free(abuf);
abuf = nbuf;
real_num_bytes = real_num_bytes * ad->real_channels / ad->channels;
}
if (ad->real_fmt != ad->fmt)
{
if (ad->real_fmt == CST_AUDIO_LINEAR16
&& ad->fmt == CST_AUDIO_MULAW)
{
nbuf = cst_alloc(char, real_num_bytes * 2);
for (i = 0; i < real_num_bytes; ++i)
((short *)nbuf)[i] = cst_ulaw_to_short(((unsigned char *)abuf)[i]);
real_num_bytes *= 2;
}
else if (ad->real_fmt == CST_AUDIO_MULAW
&& ad->fmt == CST_AUDIO_LINEAR16)
{
nbuf = cst_alloc(char, real_num_bytes / 2);
for (i = 0; i < real_num_bytes / 2; ++i)
((unsigned char *)nbuf)[i] = cst_short_to_ulaw(((short *)abuf)[i]);
real_num_bytes /= 2;
}
else if (ad->real_fmt == CST_AUDIO_LINEAR8
&& ad->fmt == CST_AUDIO_LINEAR16)
{
nbuf = cst_alloc(char, real_num_bytes / 2);
for (i = 0; i < real_num_bytes / 2; ++i)
((unsigned char *)nbuf)[i] = (((short *)abuf)[i] >> 8) + 128;
real_num_bytes /= 2;
}
else
{
cst_errmsg("audio_write: unknown format conversion (%d => %d) requested.\n",
ad->fmt, ad->real_fmt);
cst_free(nbuf);
if (abuf != buff)
cst_free(abuf);
cst_error();
}
if (abuf != buff)
cst_free(abuf);
abuf = nbuf;
}
if (ad->byteswap && audio_bps(ad->real_fmt) == 2)
swap_bytes_short((short *)abuf, real_num_bytes/2);
if (real_num_bytes)
rv = AUDIO_WRITE_NATIVE(ad,abuf,real_num_bytes);
else
rv = 0;
if (abuf != buff)
cst_free(abuf);
/* Callers expect to get the same num_bytes back as they passed
in. Funny, that ... */
return (rv == real_num_bytes) ? num_bytes : 0;
}
int audio_drain(cst_audiodev *ad)
{
return AUDIO_DRAIN_NATIVE(ad);
}
int audio_flush(cst_audiodev *ad)
{
return AUDIO_FLUSH_NATIVE(ad);
}
int play_wave(cst_wave *w)
{
cst_audiodev *ad;
int i,n,r;
int num_shorts;
if (!w)
return CST_ERROR_FORMAT;
if ((ad = audio_open(w->sample_rate, w->num_channels,
/* FIXME: should be able to determine this somehow */
CST_AUDIO_LINEAR16)) == NULL)
return CST_ERROR_FORMAT;
num_shorts = w->num_samples*w->num_channels;
for (i=0; i < num_shorts; i += r/2)
{
if (num_shorts > i+CST_AUDIOBUFFSIZE)
n = CST_AUDIOBUFFSIZE;
else
n = num_shorts-i;
r = audio_write(ad,&w->samples[i],n*2);
if (r <= 0)
{
cst_errmsg("failed to write %d samples\n",n);
break;
}
}
audio_flush(ad);
audio_close(ad);
return CST_OK_FORMAT;
}
int play_wave_sync(cst_wave *w, cst_relation *rel,
int (*call_back)(cst_item *))
{
int q,i,n,r;
cst_audiodev *ad;
float r_pos;
cst_item *item;
if (!w)
return CST_ERROR_FORMAT;
if ((ad = audio_open(w->sample_rate,w->num_channels,
CST_AUDIO_LINEAR16)) == NULL)
return CST_ERROR_FORMAT;
q=0;
item = relation_head(rel);
r_pos = w->sample_rate * 0;
for (i=0; i < w->num_samples; i += r/2)
{
if (i >= r_pos)
{
audio_flush(ad);
if ((*call_back)(item) != CST_OK_FORMAT)
break;
item = item_next(item);
if (item)
r_pos = w->sample_rate * val_float(ffeature(item,"p.end"));
else
r_pos = w->num_samples;
}
if (w->num_samples > i+CST_AUDIOBUFFSIZE)
n = CST_AUDIOBUFFSIZE;
else
n = w->num_samples-i;
r = audio_write(ad,&w->samples[i],n*2);
q +=r;
if (r <= 0)
cst_errmsg("failed to write %d samples\n",n);
}
audio_close(ad);
return CST_OK_FORMAT;
}