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97 lines
2.8 KiB
97 lines
2.8 KiB
/*
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* Copyright (C) 2006 Sippy Software, Inc.
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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. This program is released under
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* the GPL with the additional exemption that compiling, linking,
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* and/or using OpenSSL is allowed.
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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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/** @file AmJitterBuffer.h */
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#ifndef _AmJitterBuffer_h_
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#define _AmJitterBuffer_h_
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#include "amci/amci.h"
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#include "AmAudio.h"
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#include "AmThread.h"
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#include "SampleArray.h"
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#define INITIAL_JITTER 80 * SYSTEM_SAMPLECLOCK_RATE / 1000 // 80 miliseconds
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#define MAX_JITTER 2 * SYSTEM_SAMPLECLOCK_RATE // 2 seconds
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#define RESYNC_THRESHOLD 5 // resync backward if RESYNC_THRESHOLD packets arrive late
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class Packet {
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ShortSample m_data[AUDIO_BUFFER_SIZE * 2];
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unsigned int m_size;
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unsigned int m_ts;
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public:
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Packet *m_next;
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Packet *m_prev;
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void init(const ShortSample *data, unsigned int size, unsigned int ts);
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unsigned int size() const { return m_size; }
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unsigned int ts() const { return m_ts; }
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ShortSample *data() { return m_data; }
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bool operator < (const Packet&) const;
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};
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class PacketAllocator
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{
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private:
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Packet m_packets[MAX_JITTER / 80];
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Packet *m_free_packets;
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public:
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PacketAllocator();
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Packet *alloc(const ShortSample *data, unsigned int size, unsigned int ts);
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void free(Packet *p);
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};
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class AmJitterBuffer
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{
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private:
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AmMutex m_mutex;
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PacketAllocator m_allocator;
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Packet *m_head;
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Packet *m_tail;
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bool m_tsInited;
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unsigned int m_lastTs;
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unsigned int m_lastResyncTs;
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unsigned int m_lastAudioTs;
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unsigned int m_tsDelta;
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bool m_tsDeltaInited;
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int m_delayCount;
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unsigned int m_jitter;
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// AmRtpStream *m_owner;
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bool m_forceResync;
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#ifdef DEBUG_PLAYOUTBUF
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unsigned int m_tsDeltaStart;
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#endif
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public:
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AmJitterBuffer();
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void put(const ShortSample *data, unsigned int size, unsigned int ts, bool begin_talk);
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bool get(unsigned int ts, unsigned int ms, ShortSample *out, unsigned int *size, unsigned int *out_ts);
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};
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#endif // _AmJitterBuffer_h_
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