301 lines
8.5 KiB
C
301 lines
8.5 KiB
C
/*************************************************************************/
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/* */
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/* Language Technologies Institute */
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/* Carnegie Mellon University */
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/* Copyright (c) 2000 */
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/* All Rights Reserved. */
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/* */
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/* Permission is hereby granted, free of charge, to use and distribute */
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/* this software and its documentation without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of this work, and to */
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/* permit persons to whom this work is furnished to do so, subject to */
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/* the following conditions: */
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/* 1. The code must retain the above copyright notice, this list of */
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/* conditions and the following disclaimer. */
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/* 2. Any modifications must be clearly marked as such. */
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/* 3. Original authors' names are not deleted. */
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/* 4. The authors' names are not used to endorse or promote products */
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/* derived from this software without specific prior written */
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/* permission. */
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/* */
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/* CARNEGIE MELLON UNIVERSITY AND THE CONTRIBUTORS TO THIS WORK */
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/* DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING */
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/* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT */
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/* SHALL CARNEGIE MELLON UNIVERSITY NOR THE CONTRIBUTORS BE LIABLE */
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/* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */
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/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN */
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/* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, */
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/* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF */
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/* THIS SOFTWARE. */
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/* */
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/*************************************************************************/
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/* Author: Alan W Black (awb@cs.cmu.edu) */
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/* Date: October 2000 */
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/*************************************************************************/
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/* */
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/* Access to audio devices , */
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/* */
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/*************************************************************************/
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#include "cst_string.h"
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#include "cst_wave.h"
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#include "cst_audio.h"
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#include "native_audio.h"
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int audio_bps(cst_audiofmt fmt)
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{
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switch (fmt)
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{
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case CST_AUDIO_LINEAR16:
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return 2;
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case CST_AUDIO_LINEAR8:
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case CST_AUDIO_MULAW:
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return 1;
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}
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return 0;
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}
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cst_audiodev *audio_open(int sps, int channels, cst_audiofmt fmt)
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{
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cst_audiodev *ad;
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int up, down;
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ad = AUDIO_OPEN_NATIVE(sps, channels, fmt);
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if (ad == NULL)
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return NULL;
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down = sps / 1000;
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up = ad->real_sps / 1000;
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if (up != down)
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ad->rateconv = new_rateconv(up, down, channels);
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return ad;
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}
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int audio_close(cst_audiodev *ad)
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{
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if (ad->rateconv)
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delete_rateconv(ad->rateconv);
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return AUDIO_CLOSE_NATIVE(ad);
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}
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int audio_write(cst_audiodev *ad,void *buff,int num_bytes)
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{
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void *abuf = buff, *nbuf = NULL;
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int rv, i, real_num_bytes = num_bytes;
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if (ad->rateconv)
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{
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short *in, *out;
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int insize, outsize, n;
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insize = real_num_bytes / 2;
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in = (short *)buff;
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outsize = ad->rateconv->outsize;
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nbuf = out = cst_alloc(short, outsize);
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real_num_bytes = outsize * 2;
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while ((n = cst_rateconv_in(ad->rateconv, in, insize)) > 0)
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{
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in += n;
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insize -= n;
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while ((n = cst_rateconv_out(ad->rateconv, out, outsize)) > 0)
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{
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out += n;
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outsize -= n;
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}
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}
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real_num_bytes -= outsize * 2;
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if (abuf != buff)
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cst_free(abuf);
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abuf = nbuf;
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}
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if (ad->real_channels != ad->channels)
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{
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/* Yeah, we only do mono->stereo for now */
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if (ad->real_channels != 2 || ad->channels != 1)
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{
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cst_errmsg("audio_write: unsupported channel mapping requested (%d => %d).\n",
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ad->channels, ad->real_channels);
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}
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nbuf = cst_alloc(char, real_num_bytes * ad->real_channels / ad->channels);
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if (audio_bps(ad->fmt) == 2)
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{
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for (i = 0; i < real_num_bytes / 2; ++i)
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{
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((short *)nbuf)[i*2] = ((short *)abuf)[i];
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((short *)nbuf)[i*2+1] = ((short *)abuf)[i];
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}
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}
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else if (audio_bps(ad->fmt) == 1)
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{
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for (i = 0; i < real_num_bytes / 2; ++i)
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{
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((unsigned char *)nbuf)[i*2] = ((unsigned char *)abuf)[i];
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((unsigned char *)nbuf)[i*2+1] = ((unsigned char *)abuf)[i];
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}
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}
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else
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{
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cst_errmsg("audio_write: unknown format %d\n", ad->fmt);
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cst_free(nbuf);
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if (abuf != buff)
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cst_free(abuf);
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cst_error();
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}
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if (abuf != buff)
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cst_free(abuf);
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abuf = nbuf;
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real_num_bytes = real_num_bytes * ad->real_channels / ad->channels;
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}
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if (ad->real_fmt != ad->fmt)
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{
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if (ad->real_fmt == CST_AUDIO_LINEAR16
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&& ad->fmt == CST_AUDIO_MULAW)
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{
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nbuf = cst_alloc(char, real_num_bytes * 2);
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for (i = 0; i < real_num_bytes; ++i)
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((short *)nbuf)[i] = cst_ulaw_to_short(((unsigned char *)abuf)[i]);
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real_num_bytes *= 2;
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}
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else if (ad->real_fmt == CST_AUDIO_MULAW
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&& ad->fmt == CST_AUDIO_LINEAR16)
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{
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nbuf = cst_alloc(char, real_num_bytes / 2);
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for (i = 0; i < real_num_bytes / 2; ++i)
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((unsigned char *)nbuf)[i] = cst_short_to_ulaw(((short *)abuf)[i]);
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real_num_bytes /= 2;
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}
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else if (ad->real_fmt == CST_AUDIO_LINEAR8
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&& ad->fmt == CST_AUDIO_LINEAR16)
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{
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nbuf = cst_alloc(char, real_num_bytes / 2);
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for (i = 0; i < real_num_bytes / 2; ++i)
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((unsigned char *)nbuf)[i] = (((short *)abuf)[i] >> 8) + 128;
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real_num_bytes /= 2;
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}
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else
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{
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cst_errmsg("audio_write: unknown format conversion (%d => %d) requested.\n",
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ad->fmt, ad->real_fmt);
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cst_free(nbuf);
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if (abuf != buff)
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cst_free(abuf);
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cst_error();
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}
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if (abuf != buff)
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cst_free(abuf);
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abuf = nbuf;
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}
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if (ad->byteswap && audio_bps(ad->real_fmt) == 2)
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swap_bytes_short((short *)abuf, real_num_bytes/2);
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if (real_num_bytes)
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rv = AUDIO_WRITE_NATIVE(ad,abuf,real_num_bytes);
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else
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rv = 0;
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if (abuf != buff)
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cst_free(abuf);
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/* Callers expect to get the same num_bytes back as they passed
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in. Funny, that ... */
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return (rv == real_num_bytes) ? num_bytes : 0;
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}
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int audio_drain(cst_audiodev *ad)
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{
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return AUDIO_DRAIN_NATIVE(ad);
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}
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int audio_flush(cst_audiodev *ad)
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{
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return AUDIO_FLUSH_NATIVE(ad);
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}
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int play_wave(cst_wave *w)
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{
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cst_audiodev *ad;
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int i,n,r;
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int num_shorts;
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if (!w)
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return CST_ERROR_FORMAT;
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if ((ad = audio_open(w->sample_rate, w->num_channels,
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/* FIXME: should be able to determine this somehow */
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CST_AUDIO_LINEAR16)) == NULL)
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return CST_ERROR_FORMAT;
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num_shorts = w->num_samples*w->num_channels;
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for (i=0; i < num_shorts; i += r/2)
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{
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if (num_shorts > i+CST_AUDIOBUFFSIZE)
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n = CST_AUDIOBUFFSIZE;
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else
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n = num_shorts-i;
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r = audio_write(ad,&w->samples[i],n*2);
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if (r <= 0)
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{
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cst_errmsg("failed to write %d samples\n",n);
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break;
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}
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}
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audio_close(ad);
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return CST_OK_FORMAT;
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}
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int play_wave_sync(cst_wave *w, cst_relation *rel,
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int (*call_back)(cst_item *))
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{
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int q,i,n,r;
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cst_audiodev *ad;
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float r_pos;
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cst_item *item;
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if (!w)
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return CST_ERROR_FORMAT;
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if ((ad = audio_open(w->sample_rate,w->num_channels,
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CST_AUDIO_LINEAR16)) == NULL)
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return CST_ERROR_FORMAT;
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q=0;
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item = relation_head(rel);
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r_pos = w->sample_rate * 0;
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for (i=0; i < w->num_samples; i += r/2)
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{
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if (i >= r_pos)
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{
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audio_flush(ad);
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if ((*call_back)(item) != CST_OK_FORMAT)
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break;
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item = item_next(item);
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if (item)
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r_pos = w->sample_rate * val_float(ffeature(item,"p.end"));
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else
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r_pos = w->num_samples;
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}
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if (w->num_samples > i+CST_AUDIOBUFFSIZE)
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n = CST_AUDIOBUFFSIZE;
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else
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n = w->num_samples-i;
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r = audio_write(ad,&w->samples[i],n*2);
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q +=r;
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if (r <= 0)
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cst_errmsg("failed to write %d samples\n",n);
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}
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audio_close(ad);
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return CST_OK_FORMAT;
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}
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