mpeg_descriptor.c

DVB MPEG2 system stream 分析, 包含 各個talbe(EIT,PMT,PAT,SDT),以及video,audio. 對於學習數字電視有很大幫助.

	
	d.module_version		 = getBits (b, 0,  0,  8);
	d.module_id			 = getBits (b, 0,  8, 16);
	d.block_size			 = getBits (b, 0, 24, 16);
	d.module_size			 = getBits (b, 0, 40, 32);
	d.CompressionMethod		 = getBits (b, 0, 72,  8);
	d.original_size			 = getBits (b, 0, 80, 32);
	d.timeout 			 = getBits (b, 0,112,  8);
	d.object_key_length		 = getBits (b, 0,120,  8);
	b   += 16;
	len -= 16;

 	out_SB_NL (4,"Module_version: ",d.module_version);		/* $$$$ Tables? */
 	out_SW_NL (4,"Module_id: ",d.module_version);
 	out_SW_NL (4,"Block_size: ",d.block_size);
 	out_SL_NL (4,"Module_size: ",d.module_size);
 	out_SB_NL (4,"Compression_method: ",d.CompressionMethod);
 	out_SL_NL (4,"Original_size: ",d.original_size);
 	out_SB_NL (4,"Timeout: ",d.timeout);
 	out_SB_NL (4,"Object_key_length: ",d.object_key_length);

 	print_databytes (4,"Object_key_data:", b, d.object_key_length);
		b   += d.object_key_length;
		len -= d.object_key_length;
 }
 indent (-1);

 print_private_data (4, b, len);

}





/*
  0x14  association tag  descriptor 
  ISO 13818-6  / TR 102 006
*/

void descriptorMPEG_Association_tag (u_char *b)

{

 typedef struct  _descAssociationTag {
    u_int      descriptor_tag;
    u_int      descriptor_length;		

    u_int      association_tag;
    u_int      use;

    u_int      selector_length;
    // -- optional
    //         selector_length;
    u_long     transaction_id;
    u_long     timeout;

    // -- optional
    //         selector_length;

    // -- optional
    //         selector_length;
    //         selector_bytes;

 } descAssociationTag;


 descAssociationTag  d;
 int                 len;



 d.descriptor_tag		 = b[0];
 d.descriptor_length       	 = b[1];

 d.association_tag		 = getBits (b, 0, 16, 16);
 d.use                           = getBits (b, 0, 32, 16);
 d.selector_length		 = getBits (b, 0, 40,  8); /* normally in the opt branches... */
 b  += 7;
 len = d.descriptor_length - 5;


 out_SW_NL (4,"Association_tag: ",d.association_tag);		/* $$$$ Tables? */
 out_SW_NL (4,"Use: ",d.use);
 out_SB_NL (4,"Selector_length: ",d.selector_length);

 if (d.use == 0x0000) {

 	d.transaction_id 	 = getBits (b, 0,  0, 32);
 	d.timeout		 = getBits (b, 0, 32, 32);
	b   += 8;
	len -= 8;
 	out_SL_NL (4,"Transaction_ID: ",d.transaction_id);
 	out_SL_NL (4,"Timeout: ",d.timeout);

 } else if (d.use == 0x0001) {

	 /* selector length == 0x00; */

 } else {
	print_databytes (4,"Selector bytes:", b, d.selector_length);
 }

 print_private_data (4, b, len);

}







/*
  0x15  deferred association tag  descriptor 
  ISO 13818-6  / TR 102 006
*/

void descriptorMPEG_Deferred_Association_tags (u_char *b)

{

 typedef struct  _descDefAssocTags {
    u_int      descriptor_tag;
    u_int      descriptor_length;		

    u_int      association_tags_loop_length;
    // association tag loop
    u_int	association_tag;

    u_int      transport_stream_id;
    u_int      program_number;
    u_int      org_network_id;

    // private bytes

 } descDefAssocTags;


 descDefAssocTags  d;
 int               len,i;



 d.descriptor_tag		 = b[0];
 d.descriptor_length       	 = b[1];

 d.association_tags_loop_length	 = getBits (b, 0, 16,  8);
 b  += 3;
 len = d.descriptor_length - 1;


 out_SW_NL (4,"Association_tags_loop_length: ",d.association_tags_loop_length);

 /* -- association tags */
 out_nl (4,"Association tag loop:");
 	indent (+1);
	for (i=0; i < d.association_tags_loop_length; ) {
 		d.association_tag	 = getBits (b, 0, i,  16);
 		out_SW_NL (4,"Association_tag: ",d.association_tag);
		i += 2;
	}
	indent (-1);
	b   += d.association_tags_loop_length;
	len -= d.association_tags_loop_length;


 d.transport_stream_id			= getBits (b, 0,  0,  16);
 d.program_number			= getBits (b, 0, 16,  16);
 d.org_network_id			= getBits (b, 0, 32,  16);
 b   += 6;
 len -= 6;

 out_SW_NL  (4,"Transport_stream_ID: ",d.transport_stream_id);
 out_SW_NL  (4,"Program_number: ",d.program_number);
 out_S2W_NL (4,"Original_network_ID: ",d.org_network_id,
	dvbstrOriginalNetwork_ID(d.org_network_id));


 print_private_data (4, b, len);

}




/*
 * ------------------------------------------------------------
 *
 * -- DSM-CC  STREAM Descriptors  ISO 13818-6
 *
 */




/*
  0x17   DSMCC  NPT-reference descriptor 
  ISO 13818-6 
*/

void descriptorMPEG_NPT_reference (u_char *b)
{
   // descriptor_tag		 = b[0];
   // descriptor_length       	 = b[1];

   outBit_S2x_NL(4,"postDiscontinuityIndicator: ",  	b,16, 1,
	   	(char *(*)(u_long)) dsmccStr_postDiscontinuityIndicator);
   outBit_Sx_NL (4,"contentId: ",		  	b,17, 7);
   outBit_Sx_NL (6,"reserved: ",		  	b,24, 7);

   outBit64_Sx  (4,"STC_Reference: ",		  	b,31,33);
   	out_nl  (4,"  [= ref/300 * 90 kHz]");
 
   outBit_Sx_NL (6,"reserved: ",		  	b,64,31);
   outBit64_Sx_NL (4,"NPT_Reference: ",		  	b,75,33);
   outBit_Sx_NL (4,"scaleNumerator: ",		  	b,108,16);
   outBit_Sx_NL (4,"scaleDenominator: ",	  	b,124,16);

}



/*
  0x18   DSMCC  NPT-endpoint descriptor 
  ISO 13818-6 
*/

void descriptorMPEG_NPT_endpoint (u_char *b)
{
   unsigned long long t;

   // descriptor_tag		 = b[0];
   // descriptor_length       	 = b[1];

   outBit_Sx_NL (6,"reserved: ",		  	b,16,15);

   t = outBit64_Sx (4,"startNPT: ",		  	b,31,33);
       out_nl_calc_NPT (4,t); 

   outBit_Sx_NL (6,"reserved: ",		  	b,64,15);

   t = outBit64_Sx (4,"stopNPT: ",			b,79,33);
       out_nl_calc_NPT (4,t); 

}





/*
  0x19   DSMCC  stream_mode descriptor 
  ISO 13818-6 
*/

void descriptorMPEG_stream_mode (u_char *b)
{
   // descriptor_tag		 = b[0];
   // descriptor_length       	 = b[1];

   outBit_S2x_NL(4,"streamMode: ",		  	b,16, 8,
		   	(char *(*)(u_long)) dsmccStr_streamMode);
   outBit_Sx_NL (6,"reserved: ",		  	b,24, 8);
 
}





/*
  0x1A   DSMCC  stream_event descriptor 
  ISO 13818-6 
*/

void descriptorMPEG_stream_event (u_char *b)
{
   unsigned long long t;
   int len;

   // descriptor_tag	 = b[0];
   len		       	 = b[1];

   outBit_Sx_NL (4,"eventId: ",		  		b,16,16);
   outBit_Sx_NL (6,"reserved: ",		  	b,32,31);
   t = outBit64_Sx (4,"eventNPT: ",		  	b,79,33);
       out_nl_calc_NPT (4,t); 
   
   b += 10;
   len -= 8;

   print_private_data (4, b, len);

}








/*
 * ------------------------------------------------------------
 *
 * -- MPEG4 Descriptors  ISO 13818-1
 *
 */



/*
  0x1B  MPEG4 video  descriptor 
  ISO 13818-1  
*/

void descriptorMPEG_MPEG4_video (u_char *b)

{
 // d.descriptor_tag		 = b[0];
 // d.descriptor_length       	 = b[1];
 outBit_Sx_NL (4,"MPEG4 visual profile and level: ",  	b,16,8); /* $$$  Table */
}


 
/*
  0x1C  MPEG4 audio  descriptor 
  ISO 13818-1  
*/

void descriptorMPEG_MPEG4_audio (u_char *b)

{
 // d.descriptor_tag		 = b[0];
 // d.descriptor_length       	 = b[1];

 outBit_Sx_NL (4,"MPEG4 audio profile and level: ",  	b,16,8); /* $$$  Table */
}




/*
  0x1D  IOD - InitialObjectDescriptor
  ISO 13818-1  
*/

void descriptorMPEG_IOD (u_char *b)

{
 // d.descriptor_tag		 = b[0];
 // d.descriptor_length       	 = b[1];

 outBit_Sx_NL (4,"Scope_of_IOD: ",  	b,16,8);
 outBit_Sx_NL (4,"IOD_label: ",  	b,24,8);
 outBit_Sx_NL (4,"InitialObjectDescriptor: ", b,32,8);	// $$$ TODO defined in subclause 8.6.3.1 of ISO/IEC 14496-1
}



/*
  0x1E  SL descriptor
  ISO 13818-1  
*/

void descriptorMPEG_SL (u_char *b)

{ 
 // d.descriptor_tag		 = b[0];
 // d.descriptor_length       	 = b[1];

 outBit_Sx_NL (4,"ES_ID: ",  	b,16,16);
}




/*
  0x1F  FMC descriptor
  ISO 13818-1  
*/

void descriptorMPEG_FMC (u_char *b)

{
  int descriptor_length;

  // d.descriptor_tag		 = b[0];
  descriptor_length       	 = b[1];

  b += 2;
  while (descriptor_length > 0 ) {
 	outBit_Sx_NL (4,"ES_ID: ",  		b, 0,16);
 	outBit_Sx_NL (4,"FlexMuxChannel: ",  	b,16, 8);
	b += 3;
	descriptor_length -= 3;
  }

}



/*
  0x20  External SL descriptor
  ISO 13818-1  
*/

void descriptorMPEG_External_ES_ID (u_char *b)

{ 
 // d.descriptor_tag		 = b[0];
 // d.descriptor_length       	 = b[1];

 outBit_Sx_NL (4,"ES_ID: ",  	b,16,16);
}





/*
  0x21  MuxCode descriptor
  ISO 13818-1  
*/

void descriptorMPEG_MuxCode (u_char *b)

{
  int descriptor_length;

  // d.descriptor_tag		 = b[0];
  descriptor_length       	 = b[1];



 print_databytes (4,"MuxCodeTableEntry", b+2, descriptor_length-2); // $$$ TODO

   // $$$ TODO  defined in subclause 11.2.4.3 of ISO/IEC 14496-1.
   // Muxcode_descriptor () {
   // 	descriptor_tag 8 uimsbf
   // 	descriptor_length 8 uimsbf
   // 	for (i = 0; i < N; i++) {
   // 		MuxCodeTableEntry ()
   // 	}
   // }


}


/*
  0x22  FMX Buffer Size descriptor
  ISO 13818-1  
*/

void descriptorMPEG_FMXBufferSize (u_char *b)

{
  int descriptor_length;

  // d.descriptor_tag		 = b[0];
  descriptor_length       	 = b[1];



  out_nl (4,"($$$TODO):");
  indent (+1);
  printhex_buf (4, b+2, descriptor_length-2);
  indent (-1);


   // $$$ TODO defined in subclause 11.2 of ISO/IEC 14496-1.
   // FmxBufferSize_descriptor () {
   // 	descriptor_tag 8 uimsbf
   // 	descriptor_length 8 uimsbf
   // 	DefaultFlexMuxBufferDescriptor()
   // 	for (i=0; i<descriptor_length; i += 4) {
   // 		FlexMuxBufferDescriptor()
   // 	}
   // }

}


/*
  0x23   Multiplex Buffer descriptor
  ISO 13818-1  
*/

void descriptorMPEG_MultiplexBuffer (u_char *b)

{
  // d.descriptor_tag		 = b[0];
  // d.descriptor_length       	 = b[1];


 outBit_S2Tx_NL (4,"MB_buffer_size: ", 	b,16,24,"bytes");
 outBit_S2Tx_NL (4,"TB_leak_rate: ",  	b,40,24,"(x 400 bit/s)");

}



/*
  0x24   Flex-Mux-Timing descriptor
  ITU-T H.222.0-I-Cor1 
*/

void descriptorMPEG_FlexMuxTiming (u_char *b)

{
  // d.descriptor_tag		 = b[0];
  // d.descriptor_length       	 = b[1];


 outBit_Sx_NL   (4,"FCR_ES_ID: ",  	b,16,16);
 outBit_S2Tx_NL (4,"FCRResolution: ",  	b,32,32,"(cycles/s)");
 outBit_Sx_NL   (4,"FCRLength: ",  	b,64, 8);
 outBit_Sx_NL   (4,"FCRRateLength: ",  	b,72, 8);

}