/* * device.h: The basic device interface * * See the main source file 'vdr.c' for copyright information and * how to reach the author. * * $Id: device.h 1.8 2002/08/15 11:09:21 kls Exp $ */ #ifndef __DEVICE_H #define __DEVICE_H #include "thread.h" #include "tools.h" #define MAXDEVICES 16 // the maximum number of devices in the system #define MAXCACAPS 16 // the maximum number of different CA values per device #define MAXPIDHANDLES 16 // the maximum number of different PIDs per device #define MAXRECEIVERS 16 // the maximum number of receivers per device #define MAXVOLUME 255 #define VOLUMEDELTA 5 // used to increase/decrease the volume #define TS_SIZE 188 #define TS_SYNC_BYTE 0x47 #define PID_MASK_HI 0x1F enum eSetChannelResult { scrOk, scrNoTransfer, scrFailed }; enum ePlayMode { pmNone, // audio/video from decoder pmAudioVideo, // audio/video from player pmAudioOnly, // audio only from player, video from decoder pmExtern_THIS_SHOULD_BE_AVOIDED // external player (e.g. MPlayer), release the device // WARNING: USE THIS MODE ONLY AS A LAST RESORT, IF YOU // ABSOLUTELY, POSITIVELY CAN'T IMPLEMENT YOUR PLAYER // THE WAY IT IS SUPPOSED TO WORK. FORCING THE DEVICE // TO RELEASE ITS FILES HANDLES (OR WHATEVER RESOURCES // IT MAY USE) TO ALLOW AN EXTERNAL PLAYER TO ACCESS // THEM MEANS THAT SUCH A PLAYER WILL NEED TO HAVE // DETAILED KNOWLEDGE ABOUT THE INTERNALS OF THE DEVICE // IN USE. AS A CONSEQUENCE, YOUR PLAYER MAY NOT WORK // IF A PARTICULAR VDR INSTALLATION USES A DEVICE NOT // KNOWN TO YOUR PLAYER. }; class cChannel; class cPlayer; class cReceiver; class cDevice : cThread { private: static int numDevices; static int useDevice; static cDevice *device[MAXDEVICES]; static cDevice *primaryDevice; public: static int NumDevices(void) { return numDevices; } // Returns the total number of devices. static void SetUseDevice(int n); // Sets the 'useDevice' flag of the given device. // If this function is not called before initializing, all devices // will be used. static bool UseDevice(int n) { return useDevice == 0 || (useDevice & (1 << n)) != 0; } // Tells whether the device with the given card index shall be used in // this instance of VDR. static bool SetPrimaryDevice(int n); // Sets the primary device to 'n' (which must be in the range // 1...numDevices) and returns true if this was possible. static cDevice *PrimaryDevice(void) { return primaryDevice; } // Returns the primary device. static cDevice *GetDevice(int Ca, int Priority, int Frequency = 0, int Vpid = 0, bool *ReUse = NULL); // Selects a free device, avoiding the primaryDevice if possible. // If Ca is not 0, the device with the given number will be returned // in case Ca is <= MAXDEVICES, or the device that provides the given // value in its caCaps. // If there is a device that is already receiving and can be re-used to // receive another data stream, that device will be returned. // If all devices are currently receiving, the one receiving with the // lowest priority (if any) that is lower than the given Priority // will be returned. // If ReUse is given, the caller will be informed whether the device can be re-used // for a new recording. If ReUse returns 'true', the caller must NOT switch the channel // (the device is already properly tuned). Otherwise the caller MUST switch the channel. static void SetCaCaps(int Index = -1); // Sets the CaCaps of the given device according to the Setup data. // By default the CaCaps of all devices are set. static void Shutdown(void); // Closes down all devices. // Must be called at the end of the program. private: static int nextCardIndex; int cardIndex; int caCaps[MAXCACAPS]; protected: cDevice(void); virtual ~cDevice(); static int NextCardIndex(int n = 0); // Each device in a given machine must have a unique card index, which // will be used to identify the device for assigning Ca parameters and // deciding whether to actually use that device in this particular // instance of VDR. Every time a new cDevice is created, it will be // given the current nextCardIndex, and then nextCardIndex will be // automatically incremented by 1. A derived class can determine whether // a given device shall be used by checking UseDevice(NextCardIndex()). // If a device is skipped, or if there are possible device indexes left // after a derived class has set up all its devices, NextCardIndex(n) // must be called, where n is the number of card indexes to skip. virtual void MakePrimaryDevice(bool On); // Informs a device that it will be the primary device. If there is // anything the device needs to set up when it becomes the primary // device (On = true) or to shut down when it no longer is the primary // device (On = false), it should do so in this function. public: bool IsPrimaryDevice(void) const { return this == primaryDevice; } int CardIndex(void) const { return cardIndex; } // Returns the card index of this device (0 ... MAXDEVICES - 1). virtual int ProvidesCa(int Ca); //XXX TODO temporarily made this function virtual - until a general //XXX mechanism has been implemented // Checks whether this device provides the given value in its // caCaps. Returns 0 if the value is not provided, 1 if only this // value is provided, and > 1 if this and other values are provided. // If the given value is equal to the number of this device, // 1 is returned. If it is 0 (FTA), 1 plus the number of other values // in caCaps is returned. virtual bool CanBeReUsed(int Frequency, int Vpid);//XXX TODO make it more abstract // Tells whether this device is already receiving and allows another // receiver with the given settings to be attached to it. virtual bool HasDecoder(void) const; // Tells whether this device has an MPEG decoder. // Channel facilities protected: int currentChannel; public: eSetChannelResult SetChannel(const cChannel *Channel); // Sets the device to the given channel (general setup). virtual bool SetChannelDevice(const cChannel *Channel); // Sets the device to the given channel (actual physical setup). static int CurrentChannel(void) { return primaryDevice ? primaryDevice->currentChannel : 0; } // Returns the number of the current channel on the primary device. int Channel(void) { return currentChannel; } // Returns the number of the current channel on this device. // PID handle facilities private: bool active; virtual void Action(void); protected: enum ePidType { ptVideo, ptAudio, ptTeletext, ptDolby, ptOther }; class cPidHandle { public: int pid; int handle; int used; cPidHandle(void) { pid = used = 0; handle = -1; } }; cPidHandle pidHandles[MAXPIDHANDLES]; bool AddPid(int Pid, ePidType PidType = ptOther); // Adds a PID to the set of PIDs this device shall receive. void DelPid(int Pid); // Deletes a PID from the set of PIDs this device shall receive. virtual bool SetPid(cPidHandle *Handle, int Type, bool On); // Does the actual PID setting on this device. // On indicates whether the PID shall be added or deleted. // Handle->handle can be used by the device to store information it // needs to receive this PID (for instance a file handle). // Handle->used indicated how many receivers are using this PID. // Type indicates some special types of PIDs, which the device may // need to set in a specific way. // Image Grab facilities public: virtual bool GrabImage(const char *FileName, bool Jpeg = true, int Quality = -1, int SizeX = -1, int SizeY = -1); // Grabs the currently visible screen image into the given file, with the // given parameters. // Video format facilities public: virtual void SetVideoFormat(bool VideoFormat16_9); // Sets the output video format to either 16:9 or 4:3 (only useful // if this device has an MPEG decoder). // Volume facilities private: bool mute; int volume; protected: virtual void SetVolumeDevice(int Volume); // Sets the audio volume on this device (Volume = 0...255). public: bool IsMute(void) { return mute; } bool ToggleMute(void); // Turns the volume off or on and returns the new mute state. void SetVolume(int Volume, bool Absolute = false); // Sets the volume to the given value, either absolutely or relative to // the current volume. static int CurrentVolume(void) { return primaryDevice ? primaryDevice->volume : 0; }//XXX??? // Player facilities private: cPlayer *player; protected: virtual bool SetPlayMode(ePlayMode PlayMode); // Sets the device into the given play mode. // Returns true if the operation was successful. public: virtual void TrickSpeed(int Speed); // Sets the device into a mode where replay is done slower. // Every single frame shall then be displayed the given number of // times. virtual void Clear(void); // Clears all video and audio data from the device. virtual void Play(void); // Sets the device into play mode (after a previous trick // mode). virtual void Freeze(void); // Puts the device into "freeze frame" mode. virtual void Mute(void); // Turns off audio while replaying. virtual void StillPicture(const uchar *Data, int Length); // Displays the given I-frame as a still picture. virtual bool NeedsData(int Wait = 0); // Returns true if the device needs further data for replaying. // If Wait is not zero, the device will wait up to the given number // of milleseconds before returning in case there is no immediate // need for data. virtual int PlayVideo(const uchar *Data, int Length); // Actually plays the given data block as video. The data must be // part of a PES (Packetized Elementary Stream) which can contain // one video and one audio strem. virtual int PlayAudio(const uchar *Data, int Length); // Plays additional audio streams, like Dolby Digital. bool Replaying(void); // Returns true if we are currently replaying. void StopReplay(void); // Stops the current replay session (if any). bool AttachPlayer(cPlayer *Player); // Attaches the given player to this device. void Detach(cPlayer *Player); // Detaches the given player from this device. // Receiver facilities private: cReceiver *receiver[MAXRECEIVERS]; int ca; int Priority(void); // Returns the priority of the current receiving session (0..MAXPRIORITY), // or -1 if no receiver is currently active. The primary device will // always return at least Setup.PrimaryLimit-1. int CanShift(int Ca, int Priority, int UsedCards = 0); protected: virtual bool OpenDvr(void); // Opens the DVR of this device and prepares it to deliver a Transport // Stream for use in a cReceiver. virtual void CloseDvr(void); // Shuts down the DVR. virtual int GetTSPacket(uchar *Data); // Gets exactly one TS packet from the DVR of this device and copies it // into the given memory area (which is exactly 188 bytes in size). // Returns the number of bytes copied into Data (which must be 188). // If there is currently no TS packet available, 0 should be returned. // In case of a non recoverable error, returns -1. public: int Ca(void) { return ca; } // Returns the ca of the current receiving session. bool Receiving(void); // Returns true if we are currently receiving. bool AttachReceiver(cReceiver *Receiver); // Attaches the given receiver to this device. void Detach(cReceiver *Receiver); // Detaches the given receiver from this device. }; #endif //__DEVICE_H