/*-
 * Copyright (c) 1993-1995 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and the Network Research Group at
 *      Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef vat_decoder_h
#define vat_decoder_h

#include "Tcl.h"
#include "source.h"
#include "controller.h"

/*XXX*/
#define PLAYO_FILTER 5
#define VAR_FILTER 5
#define VAR_MULT 2

class Decoder : public PacketHandler {
    protected:
	Decoder();
    public:
	virtual ~Decoder();

	/* statistics */
	void info(char* wrk) const;
	virtual void stats(char* wrk);
	virtual int command(int argc, const char*const* argv);
    protected:
	void consume_samples(const rtphdr* rh, const u_int8_t* p, int cc);
	void count(int statno);
	void setstat(int statno, u_int v);
	int adapt(const rtphdr*, u_int32_t sclock);
	int active() const;
	inline u_int32_t playout() const { return (playout_ >> PLAYO_FILTER); }
/*XXX*/
#define MAXSTAT 16
	struct statcntr {
		const char* name;
		u_int cnt;
	} stat_[MAXSTAT];
	int nstat_;

	Controller* controller_;

	/*
	 * Playback point estimation state.
	 */
	int32_t var_;		// variance in this host's interarrival time
	u_int32_t hostoffset_;	// timestamp offset this host's clock
	u_int32_t predicted_drop_;	// ts of last drop + blocksize
	u_int32_t playout_;	// playout delay (in media units)
	u_int32_t lastrecv_;	// local time (in media time) of last recv
	int lecture_mode_;	/*XXX*/
	int framesize_;		/*XXX*/
	int block_size_;
	int maxdel_;
};

class PCM_Decoder : public Decoder {
    public:
	virtual void recv(const struct rtphdr*, const u_char* data, int len);
};

inline int Decoder::active() const
{
	return (controller_ && controller_->active());
}

/*
 * Decode steps:
 *	1. decode (to get blocksize)
 *	2. adapt (now that we have blocksize)
 *	3. mix (now that we have adapted)
 */
inline void Decoder::consume_samples(const rtphdr* rh, const u_int8_t* p,
			             int cc)
{
	block_size_ = cc;
	int plout = adapt(rh, controller_->media_ts());
	if (plout >= 0)
		controller_->mix_from_net(plout, p, cc);
}

inline void Decoder::count(int statno)
{
	++stat_[statno].cnt;
}

inline void Decoder::setstat(int statno, u_int v)
{
	stat_[statno].cnt = v;
}

#endif