SPEGPacket.h

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#ifndef SPEGPACKET_H
#define SPEGPACKET_H

#include <sys/types.h>

#include "MNRTPDecoderCommon.h"

extern "C" {
#include "dbuf.h"
}

typedef struct {
    u_int16_t len;
    u_int16_t seq;
    u_int32_t flags;
} pack_head;

#define PACK_FAKE_CHUNK 0x80000000
#define PACK_PRIO_MASK 0x78000000
#define PACK_PRIO_SHIFT 27
#define PACK_TEMP_REF_MASK 0x07c00000
#define PACK_TEMP_REF_SHIFT 22
#define PACK_FFV 0x00200000
#define PACK_FFC_MASK 0x001c0000
#define PACK_FFC_SHIFT 18
#define PACK_FBV 0x00020000
#define PACK_BFC_MASK 0x0001c000
#define PACK_BFC_SHIFT 14
#define PACK_EXT_LEV_MASK 0x00003000
#define PACK_EXT_LEV_SHIFT 12

#define PACK_RESERVED 0x00000f00

#define PACK_PIC_HDR 0x00000080
#define PACK_GOP_HDR 0x00000040
#define PACK_SEQ_HDR 0x00000020
#define PACK_CHUNK_CTD 0x00000010
#define PACK_NEW_CHUNK 0x00000008
#define PACK_PIC_TYPE_MASK 0x00000007
#define PACK_PIC_TYPE_SHIFT 0

#define PACK_MOT_VEC_MASK (PACK_FFV | PACK_FFC_MASK | PACK_FBV | PACK_BFC_MASK)
#define PACK_MOT_VEC_SHIFT PACK_BFC_SHIFT

#define PACK(type, x)   (((x) << PACK_##type##_SHIFT) & PACK_##type##_MASK)
#define UNPACK(type, x) (((x) & PACK_##type##_MASK) >> PACK_##type##_SHIFT)

const int P_prio    = 14;
const int B_prio    = 13;
const int x1_I_prio = 12;
const int x1_P_prio = 11;
const int x1_B_prio = 10;
const int x2_I_prio = 9;
const int x2_P_prio = 8;
const int x2_B_prio = 7;
const int x3_I_prio = 6;
const int x3_P_prio = 5;
const int x3_B_prio = 4;

typedef struct {
    size_t pos;
    size_t len;
} fake_ent;

typedef struct {
    dbuf *items;
  //channel_dst *dest;
    u_int32_t flags;
    u_int32_t sav_flags;
    u_int16_t sequence;
    u_int16_t length;
    int type;
    int mtu;
} clumper;

class SPEGPacket {

 public:
  SPEGPacket (int packetsize);
  // creates empty packets
  dbuf *packetize (size_t mtu, MNRope*& indata);
  // fills empty packets
  dbuf *fillpacket (FILE *sourcefile);
  // extracts data from packets
  dbuf *unpacketize (bool& more);
  // indicates if there are more empty packets in the fillpacket-buffer
  bool hasEmptyPackets ();
  // adds data to the empty-packet-buffer
  void addEmptyPackets (dbuf *pack);
  // returns 'true' if there are more filled packets in 
  // the filled-packet-buffer
  bool hasFilledPackets ();
  // adds data to the filled-packet-buffer
  void addFilledPackets (dbuf *pack);

  static int assignPrio( dbuf*& packet );
  static void appendToDbuf( dbuf*& dest, dbuf *src );

 private:
  MNRope *inBufferUnPacket;
  MNRope *inBufferFillPacket;
  MNRope *inBufferPacketize;
  dbuf *retbufUnPacket;
  dbuf *retbufFillPacket;
  dbuf *retbufPacketize;
  dbuf *workbufPacketize;
  dbuf *gather;
  dbuf *emptyPacketBuffer;
  dbuf *filledPacketBuffer;
  clumper clump;
  int pic_type_packetize;
  int packetsize;

  int itemcount;

  // all packets with lower priority are dropped
  int dropPrio;

  //  int assignPrio (dbuf*& packet);
  size_t fillDbuf (dbuf* db, MNRope*& data);
  void send_fake_ents();    
  void add_fake_ent(size_t pos, size_t len);

};

#endif /* SPEGPACKET_H */

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