liveMedia/JPEGVideoRTPSource.cpp File Reference

#include "JPEGVideoRTPSource.hh"

Include dependency graph for JPEGVideoRTPSource.cpp:

Go to the source code of this file.

Data Structures

class  JPEGBufferedPacket
class  JPEGBufferedPacketFactory

Defines

#define BYTE   unsigned char
#define WORD   unsigned
#define DWORD   unsigned long

Enumerations

enum  {
  MARKER_SOF0 = 0xc0, MARKER_SOI = 0xd8, MARKER_EOI = 0xd9, MARKER_SOS = 0xda,
  MARKER_DRI = 0xdd, MARKER_DQT = 0xdb, MARKER_DHT = 0xc4, MARKER_APP_FIRST = 0xe0,
  MARKER_APP_LAST = 0xef, MARKER_COMMENT = 0xfe
}

Functions

static void createHuffmanHeader (unsigned char *&p, unsigned char const *codelens, int ncodes, unsigned char const *symbols, int nsymbols, int tableNo, int tableClass)
static unsigned computeJPEGHeaderSize (unsigned qtlen, unsigned dri)
static void createJPEGHeader (unsigned char *buf, unsigned type, unsigned w, unsigned h, unsigned char const *qtables, unsigned qtlen, unsigned dri)
static void makeDefaultQtables (unsigned char *resultTables, unsigned Q)

Variables

static unsigned char const lum_dc_codelens []
static unsigned char const lum_dc_symbols []
static unsigned char const lum_ac_codelens []
static unsigned char const lum_ac_symbols []
static unsigned char const chm_dc_codelens []
static unsigned char const chm_dc_symbols []
static unsigned char const chm_ac_codelens []
static unsigned char const chm_ac_symbols []
static unsigned char const defaultQuantizers [128]

Define Documentation

#define BYTE   unsigned char

Definition at line 44 of file JPEGVideoRTPSource.cpp.

Referenced by createJPEGHeader().

#define DWORD   unsigned long

Definition at line 46 of file JPEGVideoRTPSource.cpp.

Referenced by dateHeader(), and JPEGVideoRTPSource::processSpecialHeader().

#define WORD   unsigned

Definition at line 45 of file JPEGVideoRTPSource.cpp.

Referenced by JPEGVideoRTPSource::processSpecialHeader().

Enumeration Type Documentation

anonymous enum

Enumerator:
MARKER_SOF0 
MARKER_SOI 
MARKER_EOI 
MARKER_SOS 
MARKER_DRI 
MARKER_DQT 
MARKER_DHT 
MARKER_APP_FIRST 
MARKER_APP_LAST 
MARKER_COMMENT 

Definition at line 71 of file JPEGVideoRTPSource.cpp.

00071      {
00072         MARKER_SOF0     = 0xc0,         // start-of-frame, baseline scan
00073         MARKER_SOI      = 0xd8,         // start of image
00074         MARKER_EOI      = 0xd9,         // end of image
00075         MARKER_SOS      = 0xda,         // start of scan
00076         MARKER_DRI      = 0xdd,         // restart interval
00077         MARKER_DQT      = 0xdb,         // define quantization tables
00078         MARKER_DHT  = 0xc4,             // huffman tables
00079         MARKER_APP_FIRST        = 0xe0,
00080         MARKER_APP_LAST         = 0xef,
00081         MARKER_COMMENT          = 0xfe,
00082 };

Function Documentation

static unsigned computeJPEGHeaderSize ( unsigned  qtlen,
unsigned  dri 
) [static]

Definition at line 172 of file JPEGVideoRTPSource.cpp.

Referenced by JPEGVideoRTPSource::processSpecialHeader().

00172                                                                     {
00173   unsigned qtlen_half = qtlen/2; // in case qtlen is odd; shouldn't happen
00174   qtlen = qtlen_half*2;
00175 
00176   unsigned numQtables = qtlen > 64 ? 2 : 1;
00177   return 485 + numQtables*5 + qtlen + (dri > 0 ? 6 : 0);
00178 }

static void createHuffmanHeader ( unsigned char *&  p,
unsigned char const *  codelens,
int  ncodes,
unsigned char const *  symbols,
int  nsymbols,
int  tableNo,
int  tableClass 
) [static]

Definition at line 156 of file JPEGVideoRTPSource.cpp.

References MARKER_DHT.

Referenced by createJPEGHeader().

00161                                                              {
00162   *p++ = 0xff; *p++ = MARKER_DHT;
00163   *p++ = 0;               /* length msb */
00164   *p++ = 3 + ncodes + nsymbols; /* length lsb */
00165   *p++ = (tableClass << 4) | tableNo;
00166   memcpy(p, codelens, ncodes);
00167   p += ncodes;
00168   memcpy(p, symbols, nsymbols);
00169   p += nsymbols;
00170 }

static void createJPEGHeader ( unsigned char *  buf,
unsigned  type,
unsigned  w,
unsigned  h,
unsigned char const *  qtables,
unsigned  qtlen,
unsigned  dri 
) [static]

Definition at line 180 of file JPEGVideoRTPSource.cpp.

References BYTE, chm_ac_codelens, chm_ac_symbols, chm_dc_codelens, chm_dc_symbols, createHuffmanHeader(), lum_ac_codelens, lum_ac_symbols, lum_dc_codelens, lum_dc_symbols, MARKER_APP_FIRST, MARKER_DQT, MARKER_DRI, MARKER_SOF0, MARKER_SOI, and MARKER_SOS.

Referenced by JPEGVideoRTPSource::processSpecialHeader().

00183                                            {
00184   unsigned char *ptr = buf;
00185   unsigned numQtables = qtlen > 64 ? 2 : 1;
00186 
00187   // MARKER_SOI:
00188   *ptr++ = 0xFF; *ptr++ = MARKER_SOI;
00189 
00190   // MARKER_APP_FIRST:
00191   *ptr++ = 0xFF; *ptr++ = MARKER_APP_FIRST;
00192   *ptr++ = 0x00; *ptr++ = 0x10; // size of chunk
00193   *ptr++ = 'J'; *ptr++ = 'F'; *ptr++ = 'I'; *ptr++ = 'F'; *ptr++ = 0x00;
00194   *ptr++ = 0x01; *ptr++ = 0x01; // JFIF format version (1.1)
00195   *ptr++ = 0x00; // no units
00196   *ptr++ = 0x00; *ptr++ = 0x01; // Horizontal pixel aspect ratio
00197   *ptr++ = 0x00; *ptr++ = 0x01; // Vertical pixel aspect ratio
00198   *ptr++ = 0x00; *ptr++ = 0x00; // no thumbnail
00199 
00200   // MARKER_DRI:
00201   if (dri > 0) {
00202     *ptr++ = 0xFF; *ptr++ = MARKER_DRI;
00203     *ptr++ = 0x00; *ptr++ = 0x04; // size of chunk
00204     *ptr++ = (BYTE)(dri >> 8); *ptr++ = (BYTE)(dri); // restart interval
00205   }
00206 
00207   // MARKER_DQT (luma):
00208   unsigned tableSize = numQtables == 1 ? qtlen : qtlen/2;
00209   *ptr++ = 0xFF; *ptr++ = MARKER_DQT;
00210   *ptr++ = 0x00; *ptr++ = tableSize + 3; // size of chunk
00211   *ptr++ = 0x00; // precision(0), table id(0)
00212   memcpy(ptr, qtables, tableSize);
00213   qtables += tableSize;
00214   ptr += tableSize;
00215 
00216   if (numQtables > 1) {
00217     unsigned tableSize = qtlen - qtlen/2;
00218     // MARKER_DQT (chroma):
00219     *ptr++ = 0xFF; *ptr++ = MARKER_DQT;
00220     *ptr++ = 0x00; *ptr++ = tableSize + 3; // size of chunk
00221     *ptr++ = 0x01; // precision(0), table id(1)
00222     memcpy(ptr, qtables, tableSize);
00223     qtables += tableSize;
00224     ptr += tableSize;
00225   }
00226 
00227   // MARKER_SOF0:
00228   *ptr++ = 0xFF; *ptr++ = MARKER_SOF0;
00229   *ptr++ = 0x00; *ptr++ = 0x11; // size of chunk
00230   *ptr++ = 0x08; // sample precision
00231   *ptr++ = (BYTE)(h >> 8);
00232   *ptr++ = (BYTE)(h); // number of lines (must be a multiple of 8)
00233   *ptr++ = (BYTE)(w >> 8);
00234   *ptr++ = (BYTE)(w); // number of columns (must be a multiple of 8)
00235   *ptr++ = 0x03; // number of components
00236   *ptr++ = 0x01; // id of component
00237   *ptr++ = type ? 0x22 : 0x21; // sampling ratio (h,v)
00238   *ptr++ = 0x00; // quant table id
00239   *ptr++ = 0x02; // id of component
00240   *ptr++ = 0x11; // sampling ratio (h,v)
00241   *ptr++ = numQtables == 1 ? 0x00 : 0x01; // quant table id
00242   *ptr++ = 0x03; // id of component
00243   *ptr++ = 0x11; // sampling ratio (h,v)
00244   *ptr++ = numQtables == 1 ? 0x00 : 0x01; // quant table id
00245 
00246   createHuffmanHeader(ptr, lum_dc_codelens, sizeof lum_dc_codelens,
00247                       lum_dc_symbols, sizeof lum_dc_symbols, 0, 0);
00248   createHuffmanHeader(ptr, lum_ac_codelens, sizeof lum_ac_codelens,
00249                       lum_ac_symbols, sizeof lum_ac_symbols, 0, 1);
00250   createHuffmanHeader(ptr, chm_dc_codelens, sizeof chm_dc_codelens,
00251                       chm_dc_symbols, sizeof chm_dc_symbols, 1, 0);
00252   createHuffmanHeader(ptr, chm_ac_codelens, sizeof chm_ac_codelens,
00253                       chm_ac_symbols, sizeof chm_ac_symbols, 1, 1);
00254 
00255   // MARKER_SOS:
00256   *ptr++ = 0xFF;  *ptr++ = MARKER_SOS;
00257   *ptr++ = 0x00; *ptr++ = 0x0C; // size of chunk
00258   *ptr++ = 0x03; // number of components
00259   *ptr++ = 0x01; // id of component
00260   *ptr++ = 0x00; // huffman table id (DC, AC)
00261   *ptr++ = 0x02; // id of component
00262   *ptr++ = 0x11; // huffman table id (DC, AC)
00263   *ptr++ = 0x03; // id of component
00264   *ptr++ = 0x11; // huffman table id (DC, AC)
00265   *ptr++ = 0x00; // start of spectral
00266   *ptr++ = 0x3F; // end of spectral
00267   *ptr++ = 0x00; // successive approximation bit position (high, low)
00268 }

static void makeDefaultQtables ( unsigned char *  resultTables,
unsigned  Q 
) [static]

Definition at line 292 of file JPEGVideoRTPSource.cpp.

References defaultQuantizers.

Referenced by JPEGVideoRTPSource::processSpecialHeader().

00292                                                                         {
00293   int factor = Q;
00294   int q;
00295 
00296   if (Q < 1) factor = 1;
00297   else if (Q > 99) factor = 99;
00298 
00299   if (Q < 50) {
00300     q = 5000 / factor;
00301   } else {
00302     q = 200 - factor*2;
00303   }
00304 
00305   for (int i = 0; i < 128; ++i) {
00306     int newVal = (defaultQuantizers[i]*q + 50)/100;
00307     if (newVal < 1) newVal = 1;
00308     else if (newVal > 255) newVal = 255;
00309     resultTables[i] = newVal;
00310   }
00311 }

Variable Documentation

unsigned char const chm_ac_codelens[] [static]

Initial value:

 {
  0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77,
}

Definition at line 128 of file JPEGVideoRTPSource.cpp.

Referenced by createJPEGHeader().

unsigned char const chm_ac_symbols[] [static]

Initial value:

 {
  0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
  0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
  0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
  0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
  0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
  0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
  0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
  0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
  0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
  0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
  0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
  0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
  0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
  0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
  0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
  0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
  0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
  0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
  0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
  0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
  0xf9, 0xfa,
}

Definition at line 132 of file JPEGVideoRTPSource.cpp.

Referenced by createJPEGHeader().

unsigned char const chm_dc_codelens[] [static]

Initial value:

 {
  0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
}

Definition at line 120 of file JPEGVideoRTPSource.cpp.

Referenced by createJPEGHeader().

unsigned char const chm_dc_symbols[] [static]

Initial value:

 {
  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
}

Definition at line 124 of file JPEGVideoRTPSource.cpp.

Referenced by createJPEGHeader().

unsigned char const defaultQuantizers[128] [static]

Initial value:

 {
  
  16, 11, 12, 14, 12, 10, 16, 14,
  13, 14, 18, 17, 16, 19, 24, 40,
  26, 24, 22, 22, 24, 49, 35, 37,
  29, 40, 58, 51, 61, 60, 57, 51,
  56, 55, 64, 72, 92, 78, 64, 68,
  87, 69, 55, 56, 80, 109, 81, 87,
  95, 98, 103, 104, 103, 62, 77, 113,
  121, 112, 100, 120, 92, 101, 103, 99,
  
  17, 18, 18, 24, 21, 24, 47, 26,
  26, 47, 99, 66, 56, 66, 99, 99,
  99, 99, 99, 99, 99, 99, 99, 99,
  99, 99, 99, 99, 99, 99, 99, 99,
  99, 99, 99, 99, 99, 99, 99, 99,
  99, 99, 99, 99, 99, 99, 99, 99,
  99, 99, 99, 99, 99, 99, 99, 99,
  99, 99, 99, 99, 99, 99, 99, 99
}

Definition at line 271 of file JPEGVideoRTPSource.cpp.

Referenced by makeDefaultQtables().

unsigned char const lum_ac_codelens[] [static]

Initial value:

 {
  0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d,
}

Definition at line 92 of file JPEGVideoRTPSource.cpp.

Referenced by createJPEGHeader().

unsigned char const lum_ac_symbols[] [static]

Initial value:

 {
  0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
  0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
  0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
  0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
  0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
  0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
  0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
  0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
  0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
  0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
  0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
  0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
  0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
  0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
  0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
  0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
  0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
  0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
  0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
  0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
  0xf9, 0xfa,
}

Definition at line 96 of file JPEGVideoRTPSource.cpp.

Referenced by createJPEGHeader().

unsigned char const lum_dc_codelens[] [static]

Initial value:

 {
  0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
}

Definition at line 84 of file JPEGVideoRTPSource.cpp.

Referenced by createJPEGHeader().

unsigned char const lum_dc_symbols[] [static]

Initial value:

 {
  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
}

Definition at line 88 of file JPEGVideoRTPSource.cpp.

Referenced by createJPEGHeader().

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