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Base class for packet generating which will be used to create magazine, subtitle, packet 830 and databroadcast packet sources.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| #include "packetsource.h" | ||
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| using namespace vbit; | ||
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| PacketSource::PacketSource() | ||
| { | ||
| //ctor | ||
| } | ||
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| PacketSource::~PacketSource() | ||
| { | ||
| //dtor | ||
| } | ||
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| Packet* PacketSource::GetPacket() | ||
| { | ||
| Packet* pkt=new Packet(8,25," "); | ||
| // Do your stuff | ||
| return pkt; | ||
| } | ||
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| bool PacketSource::IsReady() | ||
| { | ||
| return false; // @todo This will probably just return a member bool | ||
| } | ||
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| void PacketSource::SetEvent(Event event) | ||
| { | ||
| //@todo Use event to clear the event flags which may have been set by the packet source being in wait. | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,102 @@ | ||
| /** *************************************************************************** | ||
| * Description : Interface for sources of packets: mag, subtitles etc. | ||
| * Compiler : C++ | ||
| * | ||
| * Copyright (C) 2017, Peter Kwan | ||
| * | ||
| * Permission to use, copy, modify, and distribute this software | ||
| * and its documentation for any purpose and without fee is hereby | ||
| * granted, provided that the above copyright notice appear in all | ||
| * copies and that both that the copyright notice and this | ||
| * permission notice and warranty disclaimer appear in supporting | ||
| * documentation, and that the name of the author not be used in | ||
| * advertising or publicity pertaining to distribution of the | ||
| * software without specific, written prior permission. | ||
| * | ||
| * The author disclaims all warranties with regard to this | ||
| * software, including all implied warranties of merchantability | ||
| * and fitness. In no event shall the author be liable for any | ||
| * special, indirect or consequential damages or any damages | ||
| * whatsoever resulting from loss of use, data or profits, whether | ||
| * in an action of contract, negligence or other tortious action, | ||
| * arising out of or in connection with the use or performance of | ||
| * this software. | ||
| *************************************************************************** | ||
| **/ | ||
| /** | ||
| * Anything that generates teletext packets is derived from this interface. | ||
| * Functions defined by this interface are | ||
| * Constructor - sets up the data required by a particular packet source. | ||
| * GetPacket - Gets the next packet in the stream. | ||
| * Waiting - The stream is waiting for an event to restart it | ||
| * SetEvent - Registers an even with the packet source | ||
| * | ||
| * Teletext packets come in four broad categories | ||
| * 1) Magazines - Rows consisting of headers and body rows. | ||
| * 2) Subtitles - Same as magazines but sent at highest priority. | ||
| * 3) Packets on magazine 8, row 30 - Timing and control that happen on specific fields. | ||
| * 4) Databroadcast - Packets that get sent at low priority and when possible. | ||
| * | ||
| * Events | ||
| * 1) Field | ||
| * 2) 10 fields | ||
| * 3) Subtitle data in buffer | ||
| * 4) All other streams are waiting (so we can now send databroadcast) | ||
| **/ | ||
| #ifndef _PACKETSOURCE_H_ | ||
| #define _PACKETSOURCE_H_ | ||
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| #include "packet.h" | ||
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| namespace vbit{ | ||
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| /** @brief Events are used to trigger packet sources so that they may proceed | ||
| * @description Different packet sources use different timing schemes. | ||
| * Packet sources may put themselves into a waiting state. | ||
| * Events are used to start them up again. | ||
| * Magazines stop after a header and wait for the next field. | ||
| * Subtitles wait until there is data in the subtitle buffer. | ||
| * Packet 830 waits for a multiple of 10 fields. | ||
| * Databroadcast varies according to the importance of the signal. | ||
| * Lowest priority may only jump in only when a filler packet would be sent. | ||
| * Highest priority might steal all the packets except for 830. | ||
| */ | ||
| enum Event | ||
| { | ||
| EVENT_FIELD, | ||
| EVENT_P830_FORMAT_1, | ||
| EVENT_P830_FORMAT_2_LABEL_0, | ||
| EVENT_P830_FORMAT_2_LABEL_1, | ||
| EVENT_P830_FORMAT_2_LABEL_2, | ||
| EVENT_P830_FORMAT_2_LABEL_3, | ||
| EVENT_SUBTITLE, | ||
| EVENT_DATABROADCAST | ||
| } ; | ||
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| class PacketSource | ||
| { | ||
| public: | ||
| /** Default constructor */ | ||
| PacketSource(); | ||
| /** Default destructor */ | ||
| virtual ~PacketSource(); | ||
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| /** Get the next packet | ||
| * @return The next packet OR if IsReady() would return false then a filler packet | ||
| */ | ||
| virtual Packet* GetPacket()=0; | ||
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| /** Is there a packet ready to go? */ | ||
| virtual bool IsReady(); // Don't need to Pure this. Just report a member bool | ||
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| /** Report that an event happened */ | ||
| virtual void SetEvent(Event event); // Don't need to Pure this. All packet sources can use the same code | ||
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| protected: | ||
| private: | ||
| }; | ||
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| } // vbit namespace | ||
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| #endif // _PACKETSOURCE_H_ |