/******************************************************************** *                                                                  * * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   * * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     * * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       * *                                                                  * * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002             * * by the Xiph.Org Foundation http://www.xiph.org/                  * *                                                                  * ******************************************************************** function: code raw [Vorbis] packets into framed OggSquish stream and           decode Ogg streams back into raw packets last mod: $Id: framing.c 9601 2005-07-23 00:19:14Z giles $ note: The CRC code is directly derived from public domain code by Ross Williams (ross@guest.adelaide.edu.au).  See docs/framing.html for details. ********************************************************************/#include <stdlib.h>#include <string.h>#include "libspeex\ogg.h"/* A complete description of Ogg framing exists in docs/framing.html */int ogg_page_version(ogg_page *og){  return((int)(og->header[4]));}int ogg_page_continued(ogg_page *og){  return((int)(og->header[5]&0x01));}int ogg_page_bos(ogg_page *og){  return((int)(og->header[5]&0x02));}int ogg_page_eos(ogg_page *og){  return((int)(og->header[5]&0x04));}ogg_int64_t ogg_page_granulepos(ogg_page *og){  unsigned char *page=og->header;  ogg_int64_t granulepos=page[13]&(0xff);  granulepos= (granulepos<<8)|(page[12]&0xff);  granulepos= (granulepos<<8)|(page[11]&0xff);  granulepos= (granulepos<<8)|(page[10]&0xff);  granulepos= (granulepos<<8)|(page[9]&0xff);  granulepos= (granulepos<<8)|(page[8]&0xff);  granulepos= (granulepos<<8)|(page[7]&0xff);  granulepos= (granulepos<<8)|(page[6]&0xff);  return(granulepos);}int ogg_page_serialno(ogg_page *og){  return(og->header[14] |	 (og->header[15]<<8) |	 (og->header[16]<<16) |	 (og->header[17]<<24));} long ogg_page_pageno(ogg_page *og){  return(og->header[18] |	 (og->header[19]<<8) |	 (og->header[20]<<16) |	 (og->header[21]<<24));}/* returns the number of packets that are completed on this page (if   the leading packet is begun on a previous page, but ends on this   page, it's counted *//* NOTE:If a page consists of a packet begun on a previous page, and a newpacket begun (but not completed) on this page, the return will be:  ogg_page_packets(page)   ==1,   ogg_page_continued(page) !=0If a page happens to be a single packet that was begun on aprevious page, and spans to the next page (in the case of a three ormore page packet), the return will be:   ogg_page_packets(page)   ==0,   ogg_page_continued(page) !=0*/int ogg_page_packets(ogg_page *og){  int i,n=og->header[26],count=0;  for(i=0;i<n;i++)    if(og->header[27+i]<255)count++;  return(count);}#if 0/* helper to initialize lookup for direct-table CRC (illustrative; we   use the static init below) */static ogg_uint32_t _ogg_crc_entry(unsigned long index){  int           i;  unsigned long r;  r = index << 24;  for (i=0; i<8; i++)    if (r & 0x80000000UL)      r = (r << 1) ^ 0x04c11db7; /* The same as the ethernet generator				    polynomial, although we use an				    unreflected alg and an init/final				    of 0, not 0xffffffff */    else       r<<=1; return (r & 0xffffffffUL);}#endifstatic const ogg_uint32_t crc_lookup[256]={  0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9,  0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005,  0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61,  0x350c9b64,0x31cd86d3,0x3c8ea00a,0x384fbdbd,  0x4c11db70,0x48d0c6c7,0x4593e01e,0x4152fda9,  0x5f15adac,0x5bd4b01b,0x569796c2,0x52568b75,  0x6a1936c8,0x6ed82b7f,0x639b0da6,0x675a1011,  0x791d4014,0x7ddc5da3,0x709f7b7a,0x745e66cd,  0x9823b6e0,0x9ce2ab57,0x91a18d8e,0x95609039,  0x8b27c03c,0x8fe6dd8b,0x82a5fb52,0x8664e6e5,  0xbe2b5b58,0xbaea46ef,0xb7a96036,0xb3687d81,  0xad2f2d84,0xa9ee3033,0xa4ad16ea,0xa06c0b5d,  0xd4326d90,0xd0f37027,0xddb056fe,0xd9714b49,  0xc7361b4c,0xc3f706fb,0xceb42022,0xca753d95,  0xf23a8028,0xf6fb9d9f,0xfbb8bb46,0xff79a6f1,  0xe13ef6f4,0xe5ffeb43,0xe8bccd9a,0xec7dd02d,  0x34867077,0x30476dc0,0x3d044b19,0x39c556ae,  0x278206ab,0x23431b1c,0x2e003dc5,0x2ac12072,  0x128e9dcf,0x164f8078,0x1b0ca6a1,0x1fcdbb16,  0x018aeb13,0x054bf6a4,0x0808d07d,0x0cc9cdca,  0x7897ab07,0x7c56b6b0,0x71159069,0x75d48dde,  0x6b93dddb,0x6f52c06c,0x6211e6b5,0x66d0fb02,  0x5e9f46bf,0x5a5e5b08,0x571d7dd1,0x53dc6066,  0x4d9b3063,0x495a2dd4,0x44190b0d,0x40d816ba,  0xaca5c697,0xa864db20,0xa527fdf9,0xa1e6e04e,  0xbfa1b04b,0xbb60adfc,0xb6238b25,0xb2e29692,  0x8aad2b2f,0x8e6c3698,0x832f1041,0x87ee0df6,  0x99a95df3,0x9d684044,0x902b669d,0x94ea7b2a,  0xe0b41de7,0xe4750050,0xe9362689,0xedf73b3e,  0xf3b06b3b,0xf771768c,0xfa325055,0xfef34de2,  0xc6bcf05f,0xc27dede8,0xcf3ecb31,0xcbffd686,  0xd5b88683,0xd1799b34,0xdc3abded,0xd8fba05a,  0x690ce0ee,0x6dcdfd59,0x608edb80,0x644fc637,  0x7a089632,0x7ec98b85,0x738aad5c,0x774bb0eb,  0x4f040d56,0x4bc510e1,0x46863638,0x42472b8f,  0x5c007b8a,0x58c1663d,0x558240e4,0x51435d53,  0x251d3b9e,0x21dc2629,0x2c9f00f0,0x285e1d47,  0x36194d42,0x32d850f5,0x3f9b762c,0x3b5a6b9b,  0x0315d626,0x07d4cb91,0x0a97ed48,0x0e56f0ff,  0x1011a0fa,0x14d0bd4d,0x19939b94,0x1d528623,  0xf12f560e,0xf5ee4bb9,0xf8ad6d60,0xfc6c70d7,  0xe22b20d2,0xe6ea3d65,0xeba91bbc,0xef68060b,  0xd727bbb6,0xd3e6a601,0xdea580d8,0xda649d6f,  0xc423cd6a,0xc0e2d0dd,0xcda1f604,0xc960ebb3,  0xbd3e8d7e,0xb9ff90c9,0xb4bcb610,0xb07daba7,  0xae3afba2,0xaafbe615,0xa7b8c0cc,0xa379dd7b,  0x9b3660c6,0x9ff77d71,0x92b45ba8,0x9675461f,  0x8832161a,0x8cf30bad,0x81b02d74,0x857130c3,  0x5d8a9099,0x594b8d2e,0x5408abf7,0x50c9b640,  0x4e8ee645,0x4a4ffbf2,0x470cdd2b,0x43cdc09c,  0x7b827d21,0x7f436096,0x7200464f,0x76c15bf8,  0x68860bfd,0x6c47164a,0x61043093,0x65c52d24,  0x119b4be9,0x155a565e,0x18197087,0x1cd86d30,  0x029f3d35,0x065e2082,0x0b1d065b,0x0fdc1bec,  0x3793a651,0x3352bbe6,0x3e119d3f,0x3ad08088,  0x2497d08d,0x2056cd3a,0x2d15ebe3,0x29d4f654,  0xc5a92679,0xc1683bce,0xcc2b1d17,0xc8ea00a0,  0xd6ad50a5,0xd26c4d12,0xdf2f6bcb,0xdbee767c,  0xe3a1cbc1,0xe760d676,0xea23f0af,0xeee2ed18,  0xf0a5bd1d,0xf464a0aa,0xf9278673,0xfde69bc4,  0x89b8fd09,0x8d79e0be,0x803ac667,0x84fbdbd0,  0x9abc8bd5,0x9e7d9662,0x933eb0bb,0x97ffad0c,  0xafb010b1,0xab710d06,0xa6322bdf,0xa2f33668,  0xbcb4666d,0xb8757bda,0xb5365d03,0xb1f740b4};/* init the encode/decode logical stream state */int ogg_stream_init(ogg_stream_state *os,int serialno){  if(os){    memset(os,0,sizeof(*os));		//分配內存空間    os->body_storage=16*1024;    os->body_data=_ogg_malloc(os->body_storage*sizeof(*os->body_data));    os->lacing_storage=1024;    os->lacing_vals=_ogg_malloc(os->lacing_storage*sizeof(*os->lacing_vals));    os->granule_vals=_ogg_malloc(os->lacing_storage*sizeof(*os->granule_vals));    os->serialno=serialno;    return(0);  }  return(-1);} /* _clear does not free os, only the non-flat storage within */int ogg_stream_clear(ogg_stream_state *os){  if(os){    if(os->body_data)_ogg_free(os->body_data);    if(os->lacing_vals)_ogg_free(os->lacing_vals);    if(os->granule_vals)_ogg_free(os->granule_vals);    memset(os,0,sizeof(*os));      }  return(0);} int ogg_stream_destroy(ogg_stream_state *os){  if(os){    ogg_stream_clear(os);    _ogg_free(os);  }  return(0);} /* Helpers for ogg_stream_encode; this keeps the structure and   what's happening fairly clear */static void _os_body_expand(ogg_stream_state *os,int needed){  if(os->body_storage<=os->body_fill+needed){    os->body_storage+=(needed+1024);    os->body_data=_ogg_realloc(os->body_data,os->body_storage*sizeof(*os->body_data));  }}static void _os_lacing_expand(ogg_stream_state *os,int needed){  if(os->lacing_storage<=os->lacing_fill+needed){    os->lacing_storage+=(needed+32);    os->lacing_vals=_ogg_realloc(os->lacing_vals,os->lacing_storage*sizeof(*os->lacing_vals));    os->granule_vals=_ogg_realloc(os->granule_vals,os->lacing_storage*sizeof(*os->granule_vals));  }}/* checksum the page *//* Direct table CRC; note that this will be faster in the future if we   perform the checksum silmultaneously with other copies */void ogg_page_checksum_set(ogg_page *og){  if(og){    ogg_uint32_t crc_reg=0;    int i;    /* safety; needed for API behavior, but not framing code */    og->header[22]=0;    og->header[23]=0;    og->header[24]=0;    og->header[25]=0;        for(i=0;i<og->header_len;i++)      crc_reg=(crc_reg<<8)^crc_lookup[((crc_reg >> 24)&0xff)^og->header[i]];    for(i=0;i<og->body_len;i++)      crc_reg=(crc_reg<<8)^crc_lookup[((crc_reg >> 24)&0xff)^og->body[i]];        og->header[22]=(unsigned char)(crc_reg&0xff);    og->header[23]=(unsigned char)((crc_reg>>8)&0xff);    og->header[24]=(unsigned char)((crc_reg>>16)&0xff);    og->header[25]=(unsigned char)((crc_reg>>24)&0xff);  }}/* submit data to the internal buffer of the framing engine */int ogg_stream_packetin(ogg_stream_state *os,ogg_packet *op){  int lacing_vals=op->bytes/255+1,i;  if(os->body_returned){    /* advance packet data according to the body_returned pointer. We       had to keep it around to return a pointer into the buffer last       call */        os->body_fill-=os->body_returned;    if(os->body_fill)      memmove(os->body_data,os->body_data+os->body_returned,	      os->body_fill);    os->body_returned=0;  }   /* make sure we have the buffer storage */  _os_body_expand(os,op->bytes);//判斷是否需要增加緩存區大小,防止數據溢出,  _os_lacing_expand(os,lacing_vals);  /* Copy in the submitted packet.  Yes, the copy is a waste; this is     the liability of overly clean abstraction for the time being.  It     will actually be fairly easy to eliminate the extra copy in the     future */  memcpy(os->body_data+os->body_fill,op->packet,op->bytes);  //將op中的數據復制到os數組中去,os_body_fill 為地址的偏移量  os->body_fill+=op->bytes;  /* Store lacing vals for this packet */  for(i=0;i<lacing_vals-1;i++){    os->lacing_vals[os->lacing_fill+i]=255;    os->granule_vals[os->lacing_fill+i]=os->granulepos;  }  os->lacing_vals[os->lacing_fill+i]=(op->bytes)%255;//將每個body_data數據個數緩存到lacing_vals中去  os->granulepos=os->granule_vals[os->lacing_fill+i]=op->granulepos;  /* flag the first segment as the beginning of the packet */  os->lacing_vals[os->lacing_fill]|= 0x100;  os->lacing_fill+=lacing_vals;  /* for the sake of completeness */  os->packetno++;  if(op->e_o_s)os->e_o_s=1;  return(0);}/* This will flush remaining packets into a page (returning nonzero),   even if there is not enough data to trigger a flush normally   (undersized page). If there are no packets or partial packets to   flush, ogg_stream_flush returns 0.  Note that ogg_stream_flush will   try to flush a normal sized page like ogg_stream_pageout; a call to   ogg_stream_flush does not guarantee that all packets have flushed.   Only a return value of 0 from ogg_stream_flush indicates all packet   data is flushed into pages.   since ogg_stream_flush will flush the last page in a stream even if   it's undersized, you almost certainly want to use ogg_stream_pageout   (and *not* ogg_stream_flush) unless you specifically need to flush    an page regardless of size in the middle of a stream. */int ogg_stream_flush(ogg_stream_state *os,ogg_page *og){  int i;  int vals=0;  int maxvals=(os->lacing_fill>255?255:os->lacing_fill);  int bytes=0;  long acc=0;  ogg_int64_t granule_pos=-1;  if(maxvals==0)return(0);    /* construct a page */  /* decide how many segments to include */    /* If this is the initial header case, the first page must only include     the initial header packet */  if(os->b_o_s==0){  /* 'initial header page' case */    granule_pos=0;    for(vals=0;vals<maxvals;vals++){      if((os->lacing_vals[vals]&0x0ff)<255){	vals++;	break;      }    }  }else{    for(vals=0;vals<maxvals;vals++){      if(acc>4096)break;      acc+=os->lacing_vals[vals]&0x0ff;      if((os->lacing_vals[vals]&0xff)<255)        granule_pos=os->granule_vals[vals];    }  }    /* construct the header in temp storage */  memcpy(os->header,"OggS",4);    /* stream structure version */  os->header[4]=0x00;