/********************************************************************

* *

* 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 <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);

}

}

static int _v_toupper(int c) {

return (c >= 'a' && c <= 'z') ? (c & ~('a' - 'A')) : c;

}

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(_v_toupper(s1[c]) != _v_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;

int bs;

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);

bs = oggpack_read(opb,4);

if(bs<0)goto err_out;

ci->blocksizes[0]=1<<bs;

bs = oggpack_read(opb,4);

if(bs<0)goto err_out;

ci->blocksizes[1]=1<<bs;

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,

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;

}