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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 2.9 2012/09/02 09:27:20 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) and right after it gets 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(const cChannel *Channel = NULL, int Priority = MINPRIORITY);
///< Creates a new receiver for the given Channel with the given Priority.
///< If Channel is not NULL, its pids are set by a call to SetPids().
///< Otherwise pids can be added to the receiver by separate calls to the AddPid[s]
///< functions.
///< The total number of PIDs added to a receiver must not exceed MAXRECEIVEPIDS.
///< Priority may be any value in the range MINPRIORITY...MAXPRIORITY. Negative values indicate
///< that this cReceiver may be detached at any time in favor of a timer recording
///< or live viewing (without blocking the cDevice it is attached to).
virtual ~cReceiver();
bool AddPid(int Pid);
///< Adds the given Pid to the list of PIDs of this receiver.
bool AddPids(const int *Pids);
///< Adds the given zero terminated list of Pids to the list of PIDs of this
///< receiver.
bool AddPids(int Pid1, int Pid2, int Pid3 = 0, int Pid4 = 0, int Pid5 = 0, int Pid6 = 0, int Pid7 = 0, int Pid8 = 0, int Pid9 = 0);
///< Adds the given Pids to the list of PIDs of this receiver.
bool SetPids(const cChannel *Channel);
///< Sets the PIDs of this receiver to those of the given Channel,
///< replacing any previously stored PIDs. If Channel is NULL, all
///< PIDs will be cleared. Parameters in the Setup may control whether
///< certain types of PIDs (like Dolby Digital, for instance) are
///< actually set. The Channel's ID is stored and can later be retrieved
///< through ChannelID(). 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.
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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