mirror of https://github.com/VDR4Arch/vdr.git
65 lines
3.1 KiB
C++
65 lines
3.1 KiB
C++
/*
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* receiver.h: The basic receiver interface
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*
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* See the main source file 'vdr.c' for copyright information and
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* how to reach the author.
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*
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* $Id: receiver.h 1.5 2007/01/07 14:40:36 kls Exp $
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*/
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#ifndef __RECEIVER_H
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#define __RECEIVER_H
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#include "device.h"
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#define MAXRECEIVEPIDS 64 // the maximum number of PIDs per receiver
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class cReceiver {
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friend class cDevice;
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private:
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cDevice *device;
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tChannelID channelID;
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int priority;
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int pids[MAXRECEIVEPIDS];
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int numPids;
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bool WantsPid(int Pid);
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protected:
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void Detach(void);
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virtual void Activate(bool On) {}
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///< This function is called just before the cReceiver gets attached to
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///< (On == true) or detached from (On == false) a cDevice. It can be used
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///< to do things like starting/stopping a thread.
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///< It is guaranteed that Receive() will not be called before Activate(true).
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virtual void Receive(uchar *Data, int Length) = 0;
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///< This function is called from the cDevice we are attached to, and
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///< delivers one TS packet from the set of PIDs the cReceiver has requested.
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///< The data packet must be accepted immediately, and the call must return
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///< as soon as possible, without any unnecessary delay. Each TS packet
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///< will be delivered only ONCE, so the cReceiver must make sure that
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///< it will be able to buffer the data if necessary.
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public:
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cReceiver(tChannelID ChannelID, int Priority, int Pid, const int *Pids1 = NULL, const int *Pids2 = NULL, const int *Pids3 = NULL);
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///< Creates a new receiver for the channel with the given ChannelID with
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///< the given Priority. Pid is a single PID (typically the video PID), while
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///< Pids1...Pids3 are pointers to zero terminated lists of PIDs.
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///< If any of these PIDs are 0, they will be silently ignored.
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///< The total number of non-zero PIDs must not exceed MAXRECEIVEPIDS.
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///< Priority may be any value in the range -99..99. Negative values indicate
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///< that this cReceiver may be detached at any time (without blocking the
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///< cDevice it is attached to).
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///< The ChannelID is necessary to allow the device that will be used for this
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///< receiver to detect and store whether the channel can be decrypted in case
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///< this is an encrypted channel. If the channel is not encrypted or this
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///< detection is not wanted, an invalid tChannelID may be given.
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virtual ~cReceiver();
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tChannelID ChannelID(void) { return channelID; }
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bool IsAttached(void) { return device != NULL; }
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///< Returns true if this receiver is (still) attached to a device.
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///< A receiver may be automatically detached from its device in
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///< case the device is needed otherwise, so code that uses a cReceiver
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///< should repeatedly check whether it is still attached, and if
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///< it isn't, delete it (or take any other appropriate measures).
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};
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#endif //__RECEIVER_H
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