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vdr/remux.h
2009-01-06 14:41:11 +01:00

287 lines
8.5 KiB
C++

/*
* remux.h: Tools for detecting frames and handling PAT/PMT
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: remux.h 2.4 2009/01/06 12:40:43 kls Exp $
*/
#ifndef __REMUX_H
#define __REMUX_H
#include "channels.h"
#include "tools.h"
enum ePesHeader {
phNeedMoreData = -1,
phInvalid = 0,
phMPEG1 = 1,
phMPEG2 = 2
};
ePesHeader AnalyzePesHeader(const uchar *Data, int Count, int &PesPayloadOffset, bool *ContinuationHeader = NULL);
class cRemux {
public:
static void SetBrokenLink(uchar *Data, int Length);
};
// Some TS handling tools.
// The following functions all take a pointer to one complete TS packet.
#define TS_SYNC_BYTE 0x47
#define TS_SIZE 188
#define TS_ERROR 0x80
#define TS_PAYLOAD_START 0x40
#define TS_TRANSPORT_PRIORITY 0x20
#define TS_PID_MASK_HI 0x1F
#define TS_SCRAMBLING_CONTROL 0xC0
#define TS_ADAPT_FIELD_EXISTS 0x20
#define TS_PAYLOAD_EXISTS 0x10
#define TS_CONT_CNT_MASK 0x0F
#define TS_ADAPT_DISCONT 0x80
#define TS_ADAPT_RANDOM_ACC 0x40 // would be perfect for detecting independent frames, but unfortunately not used by all broadcasters
#define TS_ADAPT_ELEM_PRIO 0x20
#define TS_ADAPT_PCR 0x10
#define TS_ADAPT_OPCR 0x08
#define TS_ADAPT_SPLICING 0x04
#define TS_ADAPT_TP_PRIVATE 0x02
#define TS_ADAPT_EXTENSION 0x01
inline bool TsHasPayload(const uchar *p)
{
return p[3] & TS_PAYLOAD_EXISTS;
}
inline bool TsHasAdaptationField(const uchar *p)
{
return p[3] & TS_ADAPT_FIELD_EXISTS;
}
inline bool TsPayloadStart(const uchar *p)
{
return p[1] & TS_PAYLOAD_START;
}
inline bool TsError(const uchar *p)
{
return p[1] & TS_ERROR;
}
inline int TsPid(const uchar *p)
{
return (p[1] & TS_PID_MASK_HI) * 256 + p[2];
}
inline bool TsIsScrambled(const uchar *p)
{
return p[3] & TS_SCRAMBLING_CONTROL;
}
inline int TsPayloadOffset(const uchar *p)
{
return (p[3] & TS_ADAPT_FIELD_EXISTS) ? p[4] + 5 : 4;
}
inline int TsGetPayload(const uchar **p)
{
int o = TsPayloadOffset(*p);
*p += o;
return TS_SIZE - o;
}
inline int TsContinuityCounter(const uchar *p)
{
return p[3] & TS_CONT_CNT_MASK;
}
inline int TsGetAdaptationField(const uchar *p)
{
return TsHasAdaptationField(p) ? p[5] : 0x00;
}
// Some PES handling tools:
// The following functions that take a pointer to PES data all assume that
// there is enough data so that PesLongEnough() returns true.
inline bool PesLongEnough(int Length)
{
return Length >= 6;
}
inline bool PesHasLength(const uchar *p)
{
return p[4] | p[5];
}
inline int PesLength(const uchar *p)
{
return 6 + p[4] * 256 + p[5];
}
inline int PesPayloadOffset(const uchar *p)
{
return 9 + p[8];
}
inline bool PesHasPts(const uchar *p)
{
return (p[7] & 0x80) && p[8] >= 5;
}
inline int64_t PesGetPts(const uchar *p)
{
return ((((int64_t)p[ 9]) & 0x0E) << 29) |
(( (int64_t)p[10]) << 22) |
((((int64_t)p[11]) & 0xFE) << 14) |
(( (int64_t)p[12]) << 7) |
((((int64_t)p[13]) & 0xFE) >> 1);
}
// PAT/PMT Generator:
#define MAX_SECTION_SIZE 4096 // maximum size of an SI section
#define MAX_PMT_TS (MAX_SECTION_SIZE / TS_SIZE + 1)
class cPatPmtGenerator {
private:
uchar pat[TS_SIZE]; // the PAT always fits into a single TS packet
uchar pmt[MAX_PMT_TS][TS_SIZE]; // the PMT may well extend over several TS packets
int numPmtPackets;
int patCounter;
int pmtCounter;
int patVersion;
int pmtVersion;
uchar *esInfoLength;
void IncCounter(int &Counter, uchar *TsPacket);
void IncVersion(int &Version);
void IncEsInfoLength(int Length);
protected:
int MakeStream(uchar *Target, uchar Type, int Pid);
int MakeAC3Descriptor(uchar *Target);
int MakeSubtitlingDescriptor(uchar *Target, const char *Language);
int MakeLanguageDescriptor(uchar *Target, const char *Language);
int MakeCRC(uchar *Target, const uchar *Data, int Length);
public:
cPatPmtGenerator(void);
void GeneratePat(void);
///< Generates a PAT section for later use with GetPat().
///< This function is called by default from the constructor.
void GeneratePmt(tChannelID ChannelID);
///< Generates a PMT section for the given ChannelId, for later use
///< with GetPmt().
uchar *GetPat(void);
///< Returns a pointer to the PAT section, which consist of exactly
///< one TS packet.
uchar *GetPmt(int &Index);
///< Returns a pointer to the Index'th TS packet of the PMT section.
///< Index must be initialized to 0 and will be incremented by each
///< call to GetPmt(). Returns NULL is all packets of the PMT section
///< have been fetched..
};
// PAT/PMT Parser:
class cPatPmtParser {
private:
uchar pmt[MAX_SECTION_SIZE];
int pmtSize;
int pmtPid;
int vpid;
int vtype;
protected:
int SectionLength(const uchar *Data, int Length) { return (Length >= 3) ? ((int(Data[1]) & 0x0F) << 8)| Data[2] : 0; }
public:
cPatPmtParser(void);
void ParsePat(const uchar *Data, int Length);
///< Parses the given PAT Data, which is the payload of a single TS packet
///< from the PAT stream. The PAT may consist only of a single TS packet.
void ParsePmt(const uchar *Data, int Length);
///< Parses the given PMT Data, which is the payload of a single TS packet
///< from the PMT stream. The PMT may consist of several TS packets, which
///< are delivered to the parser through several subsequent calls to
///< ParsePmt(). The whole PMT data will be processed once the last packet
///< has been received.
int PmtPid(void) { return pmtPid; }
///< Returns the PMT pid as defined by the current PAT.
///< If no PAT has been received yet, -1 will be returned.
int Vpid(void) { return vpid; }
///< Returns the video pid as defined by the current PMT.
int Vtype(void) { return vtype; }
};
// TS to PES converter:
// Puts together the payload of several TS packets that form one PES
// packet.
class cTsToPes {
private:
uchar *data;
int size;
int length;
int offset;
bool synced;
public:
cTsToPes(void);
~cTsToPes();
void PutTs(const uchar *Data, int Length);
///< Puts the payload data of the single TS packet at Data into the converter.
///< Length is always 188.
///< If the given TS packet starts a new PES payload packet, the converter
///< will be automatically reset. Any packets before the first one that starts
///< a new PES payload packet will be ignored.
const uchar *GetPes(int &Length);
///< Gets a pointer to the complete PES packet, or NULL if the packet
///< is not complete yet. If the packet is complete, Length will contain
///< the total packet length. The returned pointer is only valid until
///< the next call to PutTs() or Reset(), or until this object is destroyed.
void Reset(void);
///< Resets the converter. This needs to be called after a PES packet has
///< been fetched by a call to GetPes(), and before the next call to
///< PutTs().
};
// Some helper functions for debugging:
void BlockDump(const char *Name, const u_char *Data, int Length);
void TsDump(const char *Name, const u_char *Data, int Length);
void PesDump(const char *Name, const u_char *Data, int Length);
// Frame detector:
class cFrameDetector {
private:
int pid;
int type;
bool newFrame;
bool independentFrame;
int64_t lastPts;
bool isVideo;
int frameDuration;
int framesPerPayloadUnit;
bool scanning;
uint32_t scanner;
public:
cFrameDetector(int Pid, int Type);
int Analyze(const uchar *Data, int Length);
///< Analyzes the TS packets pointed to by Data. Length is the number of
///< bytes Data points to, and must be a multiple of 188.
///< Returns the number of bytes that have been analyzed and may be written
///< to the recording file. If the return value is 0, the data was not
///< sufficient for analyzing and Analyze() needs to be called again with
///< more actual data.
bool NewFrame(void) { return newFrame; }
///< Returns true if the data given to the last call to Analyze() started a
///< new frame.
bool IndependentFrame(void) { return independentFrame; }
///< Returns true if a new frame was detected and this is an independent frame
///< (i.e. one that can be displayed by itself, without using data from any
///< other frames).
double FramesPerSecond(void) { return frameDuration ? 90000.0 / frameDuration : 0; }
///< Returns the number of frames per second, or 0 if this information is not
///< available.
};
#endif // __REMUX_H