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/*
* receiver.h: The basic receiver interface
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: receiver.h 1.5 2007/01/07 14:40:36 kls Exp $
*/
#ifndef __RECEIVER_H
#define __RECEIVER_H
#include "device.h"
#define MAXRECEIVEPIDS 64 // the maximum number of PIDs per receiver
class cReceiver {
friend class cDevice;
private:
cDevice *device;
tChannelID channelID;
int priority;
int pids[MAXRECEIVEPIDS];
int numPids;
bool WantsPid(int Pid);
protected:
void Detach(void);
virtual void Activate(bool On) {}
///< This function is called just before the cReceiver gets attached to
///< (On == true) or detached from (On == false) a cDevice. It can be used
///< to do things like starting/stopping a thread.
///< It is guaranteed that Receive() will not be called before Activate(true).
virtual void Receive(uchar *Data, int Length) = 0;
///< This function is called from the cDevice we are attached to, and
///< delivers one TS packet from the set of PIDs the cReceiver has requested.
///< The data packet must be accepted immediately, and the call must return
///< as soon as possible, without any unnecessary delay. Each TS packet
///< will be delivered only ONCE, so the cReceiver must make sure that
///< it will be able to buffer the data if necessary.
public:
cReceiver(tChannelID ChannelID, int Priority, int Pid, const int *Pids1 = NULL, const int *Pids2 = NULL, const int *Pids3 = NULL);
///< Creates a new receiver for the channel with the given ChannelID with
///< the given Priority. Pid is a single PID (typically the video PID), while
///< Pids1...Pids3 are pointers to zero terminated lists of PIDs.
///< If any of these PIDs are 0, they will be silently ignored.
///< The total number of non-zero PIDs must not exceed MAXRECEIVEPIDS.
///< Priority may be any value in the range -99..99. Negative values indicate
///< that this cReceiver may be detached at any time (without blocking the
///< cDevice it is attached to).
///< The ChannelID is necessary to allow the device that will be used for this
///< receiver to detect and store whether the channel can be decrypted in case
///< this is an encrypted channel. If the channel is not encrypted or this
///< detection is not wanted, an invalid tChannelID may be given.
virtual ~cReceiver();
tChannelID ChannelID(void) { return channelID; }
bool IsAttached(void) { return device != NULL; }
///< Returns true if this receiver is (still) attached to a device.
///< A receiver may be automatically detached from its device in
///< case the device is needed otherwise, so code that uses a cReceiver
///< should repeatedly check whether it is still attached, and if
///< it isn't, delete it (or take any other appropriate measures).
};
#endif //__RECEIVER_H
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