diff options
Diffstat (limited to 'lib/info.c')
| -rw-r--r-- | lib/info.c | 679 |
1 files changed, 679 insertions, 0 deletions
diff --git a/lib/info.c b/lib/info.c new file mode 100644 index 0000000..3fbb7c7 --- /dev/null +++ b/lib/info.c @@ -0,0 +1,679 @@ +/******************************************************************** + * * + * 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 1994-2015 * + * by the Xiph.Org Foundation http://www.xiph.org/ * + * * + ******************************************************************** + + function: maintain the info structure, info <-> header packets + + ********************************************************************/ + +/* general handling of the header and the vorbis_info structure (and + substructures) */ + +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include <ogg/ogg.h> +#include "vorbis/codec.h" +#include "codec_internal.h" +#include "codebook.h" +#include "registry.h" +#include "window.h" +#include "psy.h" +#include "misc.h" +#include "os.h" + +#define GENERAL_VENDOR_STRING "Xiph.Org libVorbis 1.3.6" +#define ENCODE_VENDOR_STRING "Xiph.Org libVorbis I 20180316 (Now 100% fewer shells)" + +/* helpers */ +static void _v_writestring(oggpack_buffer *o,const char *s, int bytes){ + + while(bytes--){ + oggpack_write(o,*s++,8); + } +} + +static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){ + while(bytes--){ + *buf++=oggpack_read(o,8); + } +} + +void vorbis_comment_init(vorbis_comment *vc){ + memset(vc,0,sizeof(*vc)); +} + +void vorbis_comment_add(vorbis_comment *vc,const char *comment){ + vc->user_comments=_ogg_realloc(vc->user_comments, + (vc->comments+2)*sizeof(*vc->user_comments)); + vc->comment_lengths=_ogg_realloc(vc->comment_lengths, + (vc->comments+2)*sizeof(*vc->comment_lengths)); + vc->comment_lengths[vc->comments]=strlen(comment); + vc->user_comments[vc->comments]=_ogg_malloc(vc->comment_lengths[vc->comments]+1); + strcpy(vc->user_comments[vc->comments], comment); + vc->comments++; + vc->user_comments[vc->comments]=NULL; +} + +void vorbis_comment_add_tag(vorbis_comment *vc, const char *tag, const char *contents){ + /* Length for key and value +2 for = and \0 */ + char *comment=_ogg_malloc(strlen(tag)+strlen(contents)+2); + strcpy(comment, tag); + strcat(comment, "="); + strcat(comment, contents); + vorbis_comment_add(vc, comment); + _ogg_free(comment); +} + +/* This is more or less the same as strncasecmp - but that doesn't exist + * everywhere, and this is a fairly trivial function, so we include it */ +static int tagcompare(const char *s1, const char *s2, int n){ + int c=0; + while(c < n){ + if(toupper(s1[c]) != toupper(s2[c])) + return !0; + c++; + } + return 0; +} + +char *vorbis_comment_query(vorbis_comment *vc, const char *tag, int count){ + long i; + int found = 0; + int taglen = strlen(tag)+1; /* +1 for the = we append */ + char *fulltag = _ogg_malloc(taglen+1); + + strcpy(fulltag, tag); + strcat(fulltag, "="); + + for(i=0;i<vc->comments;i++){ + if(!tagcompare(vc->user_comments[i], fulltag, taglen)){ + if(count == found) { + /* We return a pointer to the data, not a copy */ + _ogg_free(fulltag); + return vc->user_comments[i] + taglen; + } else { + found++; + } + } + } + _ogg_free(fulltag); + return NULL; /* didn't find anything */ +} + +int vorbis_comment_query_count(vorbis_comment *vc, const char *tag){ + int i,count=0; + int taglen = strlen(tag)+1; /* +1 for the = we append */ + char *fulltag = _ogg_malloc(taglen+1); + strcpy(fulltag,tag); + strcat(fulltag, "="); + + for(i=0;i<vc->comments;i++){ + if(!tagcompare(vc->user_comments[i], fulltag, taglen)) + count++; + } + + _ogg_free(fulltag); + return count; +} + +void vorbis_comment_clear(vorbis_comment *vc){ + if(vc){ + long i; + if(vc->user_comments){ + for(i=0;i<vc->comments;i++) + if(vc->user_comments[i])_ogg_free(vc->user_comments[i]); + _ogg_free(vc->user_comments); + } + if(vc->comment_lengths)_ogg_free(vc->comment_lengths); + if(vc->vendor)_ogg_free(vc->vendor); + memset(vc,0,sizeof(*vc)); + } +} + +/* blocksize 0 is guaranteed to be short, 1 is guaranteed to be long. + They may be equal, but short will never ge greater than long */ +int vorbis_info_blocksize(vorbis_info *vi,int zo){ + codec_setup_info *ci = vi->codec_setup; + return ci ? ci->blocksizes[zo] : -1; +} + +/* used by synthesis, which has a full, alloced vi */ +void vorbis_info_init(vorbis_info *vi){ + memset(vi,0,sizeof(*vi)); + vi->codec_setup=_ogg_calloc(1,sizeof(codec_setup_info)); +} + +void vorbis_info_clear(vorbis_info *vi){ + codec_setup_info *ci=vi->codec_setup; + int i; + + if(ci){ + + for(i=0;i<ci->modes;i++) + if(ci->mode_param[i])_ogg_free(ci->mode_param[i]); + + for(i=0;i<ci->maps;i++) /* unpack does the range checking */ + if(ci->map_param[i]) /* this may be cleaning up an aborted + unpack, in which case the below type + cannot be trusted */ + _mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]); + + for(i=0;i<ci->floors;i++) /* unpack does the range checking */ + if(ci->floor_param[i]) /* this may be cleaning up an aborted + unpack, in which case the below type + cannot be trusted */ + _floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]); + + for(i=0;i<ci->residues;i++) /* unpack does the range checking */ + if(ci->residue_param[i]) /* this may be cleaning up an aborted + unpack, in which case the below type + cannot be trusted */ + _residue_P[ci->residue_type[i]]->free_info(ci->residue_param[i]); + + for(i=0;i<ci->books;i++){ + if(ci->book_param[i]){ + /* knows if the book was not alloced */ + vorbis_staticbook_destroy(ci->book_param[i]); + } + if(ci->fullbooks) + vorbis_book_clear(ci->fullbooks+i); + } + if(ci->fullbooks) + _ogg_free(ci->fullbooks); + + for(i=0;i<ci->psys;i++) + _vi_psy_free(ci->psy_param[i]); + + _ogg_free(ci); + } + + memset(vi,0,sizeof(*vi)); +} + +/* Header packing/unpacking ********************************************/ + +static int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb){ + codec_setup_info *ci=vi->codec_setup; + if(!ci)return(OV_EFAULT); + + vi->version=oggpack_read(opb,32); + if(vi->version!=0)return(OV_EVERSION); + + vi->channels=oggpack_read(opb,8); + vi->rate=oggpack_read(opb,32); + + vi->bitrate_upper=(ogg_int32_t)oggpack_read(opb,32); + vi->bitrate_nominal=(ogg_int32_t)oggpack_read(opb,32); + vi->bitrate_lower=(ogg_int32_t)oggpack_read(opb,32); + + ci->blocksizes[0]=1<<oggpack_read(opb,4); + ci->blocksizes[1]=1<<oggpack_read(opb,4); + + if(vi->rate<1)goto err_out; + if(vi->channels<1)goto err_out; + if(ci->blocksizes[0]<64)goto err_out; + if(ci->blocksizes[1]<ci->blocksizes[0])goto err_out; + if(ci->blocksizes[1]>8192)goto err_out; + + if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */ + + return(0); + err_out: + vorbis_info_clear(vi); + return(OV_EBADHEADER); +} + +static int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb){ + int i; + int vendorlen=oggpack_read(opb,32); + if(vendorlen<0)goto err_out; + if(vendorlen>opb->storage-8)goto err_out; + vc->vendor=_ogg_calloc(vendorlen+1,1); + _v_readstring(opb,vc->vendor,vendorlen); + i=oggpack_read(opb,32); + if(i<0)goto err_out; + if(i>((opb->storage-oggpack_bytes(opb))>>2))goto err_out; + vc->comments=i; + vc->user_comments=_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments)); + vc->comment_lengths=_ogg_calloc(vc->comments+1, sizeof(*vc->comment_lengths)); + + for(i=0;i<vc->comments;i++){ + int len=oggpack_read(opb,32); + if(len<0)goto err_out; + if(len>opb->storage-oggpack_bytes(opb))goto err_out; + vc->comment_lengths[i]=len; + vc->user_comments[i]=_ogg_calloc(len+1,1); + _v_readstring(opb,vc->user_comments[i],len); + } + if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */ + + return(0); + err_out: + vorbis_comment_clear(vc); + return(OV_EBADHEADER); +} + +/* all of the real encoding details are here. The modes, books, + everything */ +static int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb){ + codec_setup_info *ci=vi->codec_setup; + int i; + + /* codebooks */ + ci->books=oggpack_read(opb,8)+1; + if(ci->books<=0)goto err_out; + for(i=0;i<ci->books;i++){ + ci->book_param[i]=vorbis_staticbook_unpack(opb); + if(!ci->book_param[i])goto err_out; + } + + /* time backend settings; hooks are unused */ + { + int times=oggpack_read(opb,6)+1; + if(times<=0)goto err_out; + for(i=0;i<times;i++){ + int test=oggpack_read(opb,16); + if(test<0 || test>=VI_TIMEB)goto err_out; + } + } + + /* floor backend settings */ + ci->floors=oggpack_read(opb,6)+1; + if(ci->floors<=0)goto err_out; + for(i=0;i<ci->floors;i++){ + ci->floor_type[i]=oggpack_read(opb,16); + if(ci->floor_type[i]<0 || ci->floor_type[i]>=VI_FLOORB)goto err_out; + ci->floor_param[i]=_floor_P[ci->floor_type[i]]->unpack(vi,opb); + if(!ci->floor_param[i])goto err_out; + } + + /* residue backend settings */ + ci->residues=oggpack_read(opb,6)+1; + if(ci->residues<=0)goto err_out; + for(i=0;i<ci->residues;i++){ + ci->residue_type[i]=oggpack_read(opb,16); + if(ci->residue_type[i]<0 || ci->residue_type[i]>=VI_RESB)goto err_out; + ci->residue_param[i]=_residue_P[ci->residue_type[i]]->unpack(vi,opb); + if(!ci->residue_param[i])goto err_out; + } + + /* map backend settings */ + ci->maps=oggpack_read(opb,6)+1; + if(ci->maps<=0)goto err_out; + for(i=0;i<ci->maps;i++){ + ci->map_type[i]=oggpack_read(opb,16); + if(ci->map_type[i]<0 || ci->map_type[i]>=VI_MAPB)goto err_out; + ci->map_param[i]=_mapping_P[ci->map_type[i]]->unpack(vi,opb); + if(!ci->map_param[i])goto err_out; + } + + /* mode settings */ + ci->modes=oggpack_read(opb,6)+1; + if(ci->modes<=0)goto err_out; + for(i=0;i<ci->modes;i++){ + ci->mode_param[i]=_ogg_calloc(1,sizeof(*ci->mode_param[i])); + ci->mode_param[i]->blockflag=oggpack_read(opb,1); + ci->mode_param[i]->windowtype=oggpack_read(opb,16); + ci->mode_param[i]->transformtype=oggpack_read(opb,16); + ci->mode_param[i]->mapping=oggpack_read(opb,8); + + if(ci->mode_param[i]->windowtype>=VI_WINDOWB)goto err_out; + if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out; + if(ci->mode_param[i]->mapping>=ci->maps)goto err_out; + if(ci->mode_param[i]->mapping<0)goto err_out; + } + + if(oggpack_read(opb,1)!=1)goto err_out; /* top level EOP check */ + + return(0); + err_out: + vorbis_info_clear(vi); + return(OV_EBADHEADER); +} + +/* Is this packet a vorbis ID header? */ +int vorbis_synthesis_idheader(ogg_packet *op){ + oggpack_buffer opb; + char buffer[6]; + + if(op){ + oggpack_readinit(&opb,op->packet,op->bytes); + + if(!op->b_o_s) + return(0); /* Not the initial packet */ + + if(oggpack_read(&opb,8) != 1) + return 0; /* not an ID header */ + + memset(buffer,0,6); + _v_readstring(&opb,buffer,6); + if(memcmp(buffer,"vorbis",6)) + return 0; /* not vorbis */ + + return 1; + } + + return 0; +} + +/* The Vorbis header is in three packets; the initial small packet in + the first page that identifies basic parameters, a second packet + with bitstream comments and a third packet that holds the + codebook. */ + +int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){ + oggpack_buffer opb; + + if(op){ + oggpack_readinit(&opb,op->packet,op->bytes); + + /* Which of the three types of header is this? */ + /* Also verify header-ness, vorbis */ + { + char buffer[6]; + int packtype=oggpack_read(&opb,8); + memset(buffer,0,6); + _v_readstring(&opb,buffer,6); + if(memcmp(buffer,"vorbis",6)){ + /* not a vorbis header */ + return(OV_ENOTVORBIS); + } + switch(packtype){ + case 0x01: /* least significant *bit* is read first */ + if(!op->b_o_s){ + /* Not the initial packet */ + return(OV_EBADHEADER); + } + if(vi->rate!=0){ + /* previously initialized info header */ + return(OV_EBADHEADER); + } + + return(_vorbis_unpack_info(vi,&opb)); + + case 0x03: /* least significant *bit* is read first */ + if(vi->rate==0){ + /* um... we didn't get the initial header */ + return(OV_EBADHEADER); + } + if(vc->vendor!=NULL){ + /* previously initialized comment header */ + return(OV_EBADHEADER); + } + + return(_vorbis_unpack_comment(vc,&opb)); + + case 0x05: /* least significant *bit* is read first */ + if(vi->rate==0 || vc->vendor==NULL){ + /* um... we didn;t get the initial header or comments yet */ + return(OV_EBADHEADER); + } + if(vi->codec_setup==NULL){ + /* improperly initialized vorbis_info */ + return(OV_EFAULT); + } + if(((codec_setup_info *)vi->codec_setup)->books>0){ + /* previously initialized setup header */ + return(OV_EBADHEADER); + } + + return(_vorbis_unpack_books(vi,&opb)); + + default: + /* Not a valid vorbis header type */ + return(OV_EBADHEADER); + break; + } + } + } + return(OV_EBADHEADER); +} + +/* pack side **********************************************************/ + +static int _vorbis_pack_info(oggpack_buffer *opb,vorbis_info *vi){ + codec_setup_info *ci=vi->codec_setup; + if(!ci|| + ci->blocksizes[0]<64|| + ci->blocksizes[1]<ci->blocksizes[0]){ + return(OV_EFAULT); + } + + /* preamble */ + oggpack_write(opb,0x01,8); + _v_writestring(opb,"vorbis", 6); + + /* basic information about the stream */ + oggpack_write(opb,0x00,32); + oggpack_write(opb,vi->channels,8); + oggpack_write(opb,vi->rate,32); + + oggpack_write(opb,vi->bitrate_upper,32); + oggpack_write(opb,vi->bitrate_nominal,32); + oggpack_write(opb,vi->bitrate_lower,32); + + oggpack_write(opb,ov_ilog(ci->blocksizes[0]-1),4); + oggpack_write(opb,ov_ilog(ci->blocksizes[1]-1),4); + oggpack_write(opb,1,1); + + return(0); +} + +static int _vorbis_pack_comment(oggpack_buffer *opb,vorbis_comment *vc){ + int bytes = strlen(ENCODE_VENDOR_STRING); + + /* preamble */ + oggpack_write(opb,0x03,8); + _v_writestring(opb,"vorbis", 6); + + /* vendor */ + oggpack_write(opb,bytes,32); + _v_writestring(opb,ENCODE_VENDOR_STRING, bytes); + + /* comments */ + + oggpack_write(opb,vc->comments,32); + if(vc->comments){ + int i; + for(i=0;i<vc->comments;i++){ + if(vc->user_comments[i]){ + oggpack_write(opb,vc->comment_lengths[i],32); + _v_writestring(opb,vc->user_comments[i], vc->comment_lengths[i]); + }else{ + oggpack_write(opb,0,32); + } + } + } + oggpack_write(opb,1,1); + + return(0); +} + +static int _vorbis_pack_books(oggpack_buffer *opb,vorbis_info *vi){ + codec_setup_info *ci=vi->codec_setup; + int i; + if(!ci)return(OV_EFAULT); + + oggpack_write(opb,0x05,8); + _v_writestring(opb,"vorbis", 6); + + /* books */ + oggpack_write(opb,ci->books-1,8); + for(i=0;i<ci->books;i++) + if(vorbis_staticbook_pack(ci->book_param[i],opb))goto err_out; + + /* times; hook placeholders */ + oggpack_write(opb,0,6); + oggpack_write(opb,0,16); + + /* floors */ + oggpack_write(opb,ci->floors-1,6); + for(i=0;i<ci->floors;i++){ + oggpack_write(opb,ci->floor_type[i],16); + if(_floor_P[ci->floor_type[i]]->pack) + _floor_P[ci->floor_type[i]]->pack(ci->floor_param[i],opb); + else + goto err_out; + } + + /* residues */ + oggpack_write(opb,ci->residues-1,6); + for(i=0;i<ci->residues;i++){ + oggpack_write(opb,ci->residue_type[i],16); + _residue_P[ci->residue_type[i]]->pack(ci->residue_param[i],opb); + } + + /* maps */ + oggpack_write(opb,ci->maps-1,6); + for(i=0;i<ci->maps;i++){ + oggpack_write(opb,ci->map_type[i],16); + _mapping_P[ci->map_type[i]]->pack(vi,ci->map_param[i],opb); + } + + /* modes */ + oggpack_write(opb,ci->modes-1,6); + for(i=0;i<ci->modes;i++){ + oggpack_write(opb,ci->mode_param[i]->blockflag,1); + oggpack_write(opb,ci->mode_param[i]->windowtype,16); + oggpack_write(opb,ci->mode_param[i]->transformtype,16); + oggpack_write(opb,ci->mode_param[i]->mapping,8); + } + oggpack_write(opb,1,1); + + return(0); +err_out: + return(-1); +} + +int vorbis_commentheader_out(vorbis_comment *vc, + ogg_packet *op){ + + oggpack_buffer opb; + + oggpack_writeinit(&opb); + if(_vorbis_pack_comment(&opb,vc)){ + oggpack_writeclear(&opb); + return OV_EIMPL; + } + + op->packet = _ogg_malloc(oggpack_bytes(&opb)); + memcpy(op->packet, opb.buffer, oggpack_bytes(&opb)); + + op->bytes=oggpack_bytes(&opb); + op->b_o_s=0; + op->e_o_s=0; + op->granulepos=0; + op->packetno=1; + + oggpack_writeclear(&opb); + return 0; +} + +int vorbis_analysis_headerout(vorbis_dsp_state *v, + vorbis_comment *vc, + ogg_packet *op, + ogg_packet *op_comm, + ogg_packet *op_code){ + int ret=OV_EIMPL; + vorbis_info *vi=v->vi; + oggpack_buffer opb; + private_state *b=v->backend_state; + + if(!b||vi->channels<=0||vi->channels>256){ + b = NULL; + ret=OV_EFAULT; + goto err_out; + } + + /* first header packet **********************************************/ + + oggpack_writeinit(&opb); + if(_vorbis_pack_info(&opb,vi))goto err_out; + + /* build the packet */ + if(b->header)_ogg_free(b->header); + b->header=_ogg_malloc(oggpack_bytes(&opb)); + memcpy(b->header,opb.buffer,oggpack_bytes(&opb)); + op->packet=b->header; + op->bytes=oggpack_bytes(&opb); + op->b_o_s=1; + op->e_o_s=0; + op->granulepos=0; + op->packetno=0; + + /* second header packet (comments) **********************************/ + + oggpack_reset(&opb); + if(_vorbis_pack_comment(&opb,vc))goto err_out; + + if(b->header1)_ogg_free(b->header1); + b->header1=_ogg_malloc(oggpack_bytes(&opb)); + memcpy(b->header1,opb.buffer,oggpack_bytes(&opb)); + op_comm->packet=b->header1; + op_comm->bytes=oggpack_bytes(&opb); + op_comm->b_o_s=0; + op_comm->e_o_s=0; + op_comm->granulepos=0; + op_comm->packetno=1; + + /* third header packet (modes/codebooks) ****************************/ + + oggpack_reset(&opb); + if(_vorbis_pack_books(&opb,vi))goto err_out; + + if(b->header2)_ogg_free(b->header2); + b->header2=_ogg_malloc(oggpack_bytes(&opb)); + memcpy(b->header2,opb.buffer,oggpack_bytes(&opb)); + op_code->packet=b->header2; + op_code->bytes=oggpack_bytes(&opb); + op_code->b_o_s=0; + op_code->e_o_s=0; + op_code->granulepos=0; + op_code->packetno=2; + + oggpack_writeclear(&opb); + return(0); + err_out: + memset(op,0,sizeof(*op)); + memset(op_comm,0,sizeof(*op_comm)); + memset(op_code,0,sizeof(*op_code)); + + if(b){ + if(vi->channels>0)oggpack_writeclear(&opb); + if(b->header)_ogg_free(b->header); + if(b->header1)_ogg_free(b->header1); + if(b->header2)_ogg_free(b->header2); + b->header=NULL; + b->header1=NULL; + b->header2=NULL; + } + return(ret); +} + +double vorbis_granule_time(vorbis_dsp_state *v,ogg_int64_t granulepos){ + if(granulepos == -1) return -1; + + /* We're not guaranteed a 64 bit unsigned type everywhere, so we + have to put the unsigned granpo in a signed type. */ + if(granulepos>=0){ + return((double)granulepos/v->vi->rate); + }else{ + ogg_int64_t granuleoff=0xffffffff; + granuleoff<<=31; + granuleoff|=0x7ffffffff; + return(((double)granulepos+2+granuleoff+granuleoff)/v->vi->rate); + } +} + +const char *vorbis_version_string(void){ + return GENERAL_VENDOR_STRING; +} |