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114 lines
3.2 KiB
114 lines
3.2 KiB
/*
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* $Id: AmAudioMixIn.cpp 322 2007-05-02 18:49:26Z sayer $
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*
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* Copyright (C) 2007 iptego GmbH
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*
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* This file is part of sems, a free SIP media server.
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*
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* sems is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* For a license to use the sems software under conditions
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* other than those described here, or to purchase support for this
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* software, please contact iptel.org by e-mail at the following addresses:
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* info@iptel.org
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*
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* sems is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "AmAudioMixIn.h"
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#include "SampleArray.h"
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AmAudioMixIn::AmAudioMixIn(AmAudio* A, AmAudioFile* B,
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unsigned int s, double l,
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bool finish_b_while_mixing)
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: A(A),B(B), s(s), l(l),
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mixing(false), next_start_ts_i(false),
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finish_b_while_mixing(finish_b_while_mixing)
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{
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}
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AmAudioMixIn::~AmAudioMixIn() { }
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int AmAudioMixIn::get(unsigned int user_ts, unsigned char* buffer,
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unsigned int nb_samples) {
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if (!mixing) {
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if (!next_start_ts_i) {
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next_start_ts_i = true;
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next_start_ts = user_ts + s*DEFAULT_SAMPLE_RATE;
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} else {
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if (ts_less()(next_start_ts, user_ts)) {
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DBG("starting mix-in\n");
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mixing = true;
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next_start_ts = user_ts + s*DEFAULT_SAMPLE_RATE;
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}
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}
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}
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if (!mixing) {
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return A->get(user_ts, buffer, nb_samples);
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} else {
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if (l < 0.01) { // epsilon
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// only play back from B
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int res = B->get(user_ts, buffer, nb_samples);
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if (res <= 0) { // B empty
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res = A->get(user_ts, buffer, nb_samples);
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mixing = false;
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B->rewind();
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}
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return res;
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} else { // mix the two
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int res = 0;
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short* pdest = (short*)buffer;
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// get audio from A
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int len = A->get(user_ts, (unsigned char*)mix_buf, nb_samples);
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if ((len<0) && !finish_b_while_mixing) { // A finished
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return len;
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}
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for (int i=0;i<len;i++) {
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pdest[i]=(short)(((double)mix_buf[i])*(1.0-l));
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}
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res = len;
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// clear the rest
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unsigned int len_from_a = 0;
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if (res>0)
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len_from_a=(unsigned int)res;
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if (nb_samples<<1 != len_from_a)
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memset((void*)&pdest[len_from_a>>1], 0,
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nb_samples<<1 - len_from_a);
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// add audio from B
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len = B->get(user_ts, (unsigned char*)mix_buf, nb_samples);
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if (len<0) { // B finished
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mixing = false;
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B->rewind();
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} else {
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for (int i=0;i<len;i++) {
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pdest[i]+=(short)(((double)mix_buf[i])*l);
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}
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if (len>res) // audio from B is longer than from A
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res = len;
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}
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return res;
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}
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}
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}
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int AmAudioMixIn::put(unsigned int user_ts, unsigned char* buffer, unsigned int size) {
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ERROR("writing not supported\n");
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return -1;
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}
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