mirror of https://github.com/sipwise/sems.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
114 lines
3.1 KiB
114 lines
3.1 KiB
/*
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2007 iptego GmbH
|
|
*
|
|
* This file is part of sems, a free SIP media server.
|
|
*
|
|
* sems is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* For a license to use the sems software under conditions
|
|
* other than those described here, or to purchase support for this
|
|
* software, please contact iptel.org by e-mail at the following addresses:
|
|
* info@iptel.org
|
|
*
|
|
* sems is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "AmAudioMixIn.h"
|
|
#include "SampleArray.h"
|
|
|
|
AmAudioMixIn::AmAudioMixIn(AmAudio* A, AmAudioFile* B,
|
|
unsigned int s, double l,
|
|
bool finish_b_while_mixing)
|
|
: A(A),B(B), s(s), l(l),
|
|
mixing(false), next_start_ts_i(false),
|
|
finish_b_while_mixing(finish_b_while_mixing)
|
|
{
|
|
}
|
|
AmAudioMixIn::~AmAudioMixIn() { }
|
|
|
|
int AmAudioMixIn::get(unsigned int user_ts, unsigned char* buffer,
|
|
unsigned int nb_samples) {
|
|
if (!mixing) {
|
|
if (!next_start_ts_i) {
|
|
next_start_ts_i = true;
|
|
next_start_ts = user_ts + s*DEFAULT_SAMPLE_RATE;
|
|
} else {
|
|
if (ts_less()(next_start_ts, user_ts)) {
|
|
DBG("starting mix-in\n");
|
|
mixing = true;
|
|
next_start_ts = user_ts + s*DEFAULT_SAMPLE_RATE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!mixing) {
|
|
return A->get(user_ts, buffer, nb_samples);
|
|
} else {
|
|
if (l < 0.01) { // epsilon
|
|
// only play back from B
|
|
int res = B->get(user_ts, buffer, nb_samples);
|
|
if (res <= 0) { // B empty
|
|
res = A->get(user_ts, buffer, nb_samples);
|
|
mixing = false;
|
|
B->rewind();
|
|
}
|
|
return res;
|
|
} else { // mix the two
|
|
int res = 0;
|
|
short* pdest = (short*)buffer;
|
|
// get audio from A
|
|
int len = A->get(user_ts, (unsigned char*)mix_buf, nb_samples);
|
|
|
|
if ((len<0) && !finish_b_while_mixing) { // A finished
|
|
return len;
|
|
}
|
|
for (int i=0;i<len;i++) {
|
|
pdest[i]=(short)(((double)mix_buf[i])*(1.0-l));
|
|
}
|
|
|
|
res = len;
|
|
|
|
// clear the rest
|
|
unsigned int len_from_a = 0;
|
|
if (res>0)
|
|
len_from_a=(unsigned int)res;
|
|
|
|
if (nb_samples<<1 != len_from_a)
|
|
memset((void*)&pdest[len_from_a>>1], 0,
|
|
(nb_samples<<1) - len_from_a);
|
|
|
|
// add audio from B
|
|
len = B->get(user_ts, (unsigned char*)mix_buf, nb_samples);
|
|
|
|
if (len<0) { // B finished
|
|
mixing = false;
|
|
B->rewind();
|
|
} else {
|
|
for (int i=0;i<len;i++) {
|
|
pdest[i]+=(short)(((double)mix_buf[i])*l);
|
|
}
|
|
if (len>res) // audio from B is longer than from A
|
|
res = len;
|
|
}
|
|
return res;
|
|
}
|
|
}
|
|
}
|
|
|
|
int AmAudioMixIn::put(unsigned int user_ts, unsigned char* buffer, unsigned int size) {
|
|
ERROR("writing not supported\n");
|
|
return -1;
|
|
}
|