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- Committer: Arek Korbik
- Date: 2008-10-03 00:34:01 UTC
- Revision ID: arkadini@gmail.com-20081003003401-9eahru9hcz3o2qht
Remove the Tremor reference files for now.
- files removed:
- reference/tremor
added
removed
reference/tremor/info.c
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/********************************************************************
2
* *
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
4
* *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
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* *
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********************************************************************
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function: maintain the info structure, info <-> header packets
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********************************************************************/
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/* general handling of the header and the vorbis_info structure (and
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substructures) */
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "ogg.h"
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#include "ivorbiscodec.h"
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#include "codec_internal.h"
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#include "codebook.h"
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#include "registry.h"
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#include "window.h"
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#include "misc.h"
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/* helpers */
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static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
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while(bytes--){
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*buf++=oggpack_read(o,8);
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}
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}
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void vorbis_comment_init(vorbis_comment *vc){
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memset(vc,0,sizeof(*vc));
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}
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/* This is more or less the same as strncasecmp - but that doesn't exist
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* everywhere, and this is a fairly trivial function, so we include it */
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static int tagcompare(const char *s1, const char *s2, int n){
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int c=0;
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while(c < n){
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if(toupper(s1[c]) != toupper(s2[c]))
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return !0;
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c++;
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}
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return 0;
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}
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char *vorbis_comment_query(vorbis_comment *vc, char *tag, int count){
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long i;
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int found = 0;
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int taglen = strlen(tag)+1; /* +1 for the = we append */
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char *fulltag = (char *)alloca(taglen+ 1);
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strcpy(fulltag, tag);
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strcat(fulltag, "=");
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for(i=0;i<vc->comments;i++){
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if(!tagcompare(vc->user_comments[i], fulltag, taglen)){
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if(count == found)
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/* We return a pointer to the data, not a copy */
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return vc->user_comments[i] + taglen;
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else
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found++;
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}
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}
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return NULL; /* didn't find anything */
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}
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int vorbis_comment_query_count(vorbis_comment *vc, char *tag){
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int i,count=0;
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int taglen = strlen(tag)+1; /* +1 for the = we append */
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char *fulltag = (char *)alloca(taglen+1);
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strcpy(fulltag,tag);
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strcat(fulltag, "=");
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for(i=0;i<vc->comments;i++){
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if(!tagcompare(vc->user_comments[i], fulltag, taglen))
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count++;
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}
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return count;
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}
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void vorbis_comment_clear(vorbis_comment *vc){
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if(vc){
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long i;
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for(i=0;i<vc->comments;i++)
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if(vc->user_comments[i])_ogg_free(vc->user_comments[i]);
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if(vc->user_comments)_ogg_free(vc->user_comments);
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if(vc->comment_lengths)_ogg_free(vc->comment_lengths);
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if(vc->vendor)_ogg_free(vc->vendor);
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memset(vc,0,sizeof(*vc));
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}
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}
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/* blocksize 0 is guaranteed to be short, 1 is guarantted to be long.
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They may be equal, but short will never ge greater than long */
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int vorbis_info_blocksize(vorbis_info *vi,int zo){
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codec_setup_info *ci = (codec_setup_info *)vi->codec_setup;
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return ci ? ci->blocksizes[zo] : -1;
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}
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/* used by synthesis, which has a full, alloced vi */
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void vorbis_info_init(vorbis_info *vi){
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memset(vi,0,sizeof(*vi));
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vi->codec_setup=(codec_setup_info *)_ogg_calloc(1,sizeof(codec_setup_info));
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}
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void vorbis_info_clear(vorbis_info *vi){
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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int i;
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if(ci){
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for(i=0;i<ci->modes;i++)
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if(ci->mode_param[i])_ogg_free(ci->mode_param[i]);
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for(i=0;i<ci->maps;i++) /* unpack does the range checking */
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if(ci->map_param[i])
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_mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]);
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for(i=0;i<ci->floors;i++) /* unpack does the range checking */
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if(ci->floor_param[i])
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_floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]);
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for(i=0;i<ci->residues;i++) /* unpack does the range checking */
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if(ci->residue_param[i])
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_residue_P[ci->residue_type[i]]->free_info(ci->residue_param[i]);
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for(i=0;i<ci->books;i++){
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if(ci->book_param[i]){
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/* knows if the book was not alloced */
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vorbis_staticbook_destroy(ci->book_param[i]);
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}
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if(ci->fullbooks)
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vorbis_book_clear(ci->fullbooks+i);
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}
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if(ci->fullbooks)
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_ogg_free(ci->fullbooks);
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_ogg_free(ci);
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}
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memset(vi,0,sizeof(*vi));
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}
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/* Header packing/unpacking ********************************************/
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static int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb){
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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if(!ci)return(OV_EFAULT);
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vi->version=oggpack_read(opb,32);
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if(vi->version!=0)return(OV_EVERSION);
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vi->channels=oggpack_read(opb,8);
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vi->rate=oggpack_read(opb,32);
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vi->bitrate_upper=oggpack_read(opb,32);
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vi->bitrate_nominal=oggpack_read(opb,32);
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vi->bitrate_lower=oggpack_read(opb,32);
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ci->blocksizes[0]=1<<oggpack_read(opb,4);
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ci->blocksizes[1]=1<<oggpack_read(opb,4);
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if(vi->rate<1)goto err_out;
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if(vi->channels<1)goto err_out;
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if(ci->blocksizes[0]<64)goto err_out;
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if(ci->blocksizes[1]<ci->blocksizes[0])goto err_out;
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if(ci->blocksizes[1]>8192)goto err_out;
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if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
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return(0);
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err_out:
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vorbis_info_clear(vi);
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return(OV_EBADHEADER);
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}
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static int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb){
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int i;
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int vendorlen=oggpack_read(opb,32);
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if(vendorlen<0)goto err_out;
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vc->vendor=(char *)_ogg_calloc(vendorlen+1,1);
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_v_readstring(opb,vc->vendor,vendorlen);
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vc->comments=oggpack_read(opb,32);
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if(vc->comments<0)goto err_out;
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vc->user_comments=(char **)_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments));
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vc->comment_lengths=(int *)_ogg_calloc(vc->comments+1, sizeof(*vc->comment_lengths));
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for(i=0;i<vc->comments;i++){
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int len=oggpack_read(opb,32);
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if(len<0)goto err_out;
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vc->comment_lengths[i]=len;
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vc->user_comments[i]=(char *)_ogg_calloc(len+1,1);
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_v_readstring(opb,vc->user_comments[i],len);
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}
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if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
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return(0);
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err_out:
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vorbis_comment_clear(vc);
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return(OV_EBADHEADER);
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}
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/* all of the real encoding details are here. The modes, books,
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everything */
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static int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb){
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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int i;
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if(!ci)return(OV_EFAULT);
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/* codebooks */
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ci->books=oggpack_read(opb,8)+1;
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/*ci->book_param=_ogg_calloc(ci->books,sizeof(*ci->book_param));*/
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for(i=0;i<ci->books;i++){
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ci->book_param[i]=(static_codebook *)_ogg_calloc(1,sizeof(*ci->book_param[i]));
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if(vorbis_staticbook_unpack(opb,ci->book_param[i]))goto err_out;
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}
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/* time backend settings */
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ci->times=oggpack_read(opb,6)+1;
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/*ci->time_type=_ogg_malloc(ci->times*sizeof(*ci->time_type));*/
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/*ci->time_param=_ogg_calloc(ci->times,sizeof(void *));*/
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for(i=0;i<ci->times;i++){
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ci->time_type[i]=oggpack_read(opb,16);
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if(ci->time_type[i]<0 || ci->time_type[i]>=VI_TIMEB)goto err_out;
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/* ci->time_param[i]=_time_P[ci->time_type[i]]->unpack(vi,opb);
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Vorbis I has no time backend */
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/*if(!ci->time_param[i])goto err_out;*/
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}
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/* floor backend settings */
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ci->floors=oggpack_read(opb,6)+1;
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/*ci->floor_type=_ogg_malloc(ci->floors*sizeof(*ci->floor_type));*/
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/*ci->floor_param=_ogg_calloc(ci->floors,sizeof(void *));*/
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for(i=0;i<ci->floors;i++){
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ci->floor_type[i]=oggpack_read(opb,16);
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if(ci->floor_type[i]<0 || ci->floor_type[i]>=VI_FLOORB)goto err_out;
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ci->floor_param[i]=_floor_P[ci->floor_type[i]]->unpack(vi,opb);
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if(!ci->floor_param[i])goto err_out;
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}
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/* residue backend settings */
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ci->residues=oggpack_read(opb,6)+1;
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/*ci->residue_type=_ogg_malloc(ci->residues*sizeof(*ci->residue_type));*/
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/*ci->residue_param=_ogg_calloc(ci->residues,sizeof(void *));*/
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for(i=0;i<ci->residues;i++){
256
ci->residue_type[i]=oggpack_read(opb,16);
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if(ci->residue_type[i]<0 || ci->residue_type[i]>=VI_RESB)goto err_out;
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ci->residue_param[i]=_residue_P[ci->residue_type[i]]->unpack(vi,opb);
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if(!ci->residue_param[i])goto err_out;
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}
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/* map backend settings */
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ci->maps=oggpack_read(opb,6)+1;
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/*ci->map_type=_ogg_malloc(ci->maps*sizeof(*ci->map_type));*/
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/*ci->map_param=_ogg_calloc(ci->maps,sizeof(void *));*/
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for(i=0;i<ci->maps;i++){
267
ci->map_type[i]=oggpack_read(opb,16);
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if(ci->map_type[i]<0 || ci->map_type[i]>=VI_MAPB)goto err_out;
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ci->map_param[i]=_mapping_P[ci->map_type[i]]->unpack(vi,opb);
270
if(!ci->map_param[i])goto err_out;
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}
272
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/* mode settings */
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ci->modes=oggpack_read(opb,6)+1;
275
/*vi->mode_param=_ogg_calloc(vi->modes,sizeof(void *));*/
276
for(i=0;i<ci->modes;i++){
277
ci->mode_param[i]=(vorbis_info_mode *)_ogg_calloc(1,sizeof(*ci->mode_param[i]));
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ci->mode_param[i]->blockflag=oggpack_read(opb,1);
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ci->mode_param[i]->windowtype=oggpack_read(opb,16);
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ci->mode_param[i]->transformtype=oggpack_read(opb,16);
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ci->mode_param[i]->mapping=oggpack_read(opb,8);
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if(ci->mode_param[i]->windowtype>=VI_WINDOWB)goto err_out;
284
if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out;
285
if(ci->mode_param[i]->mapping>=ci->maps)goto err_out;
286
}
287
288
if(oggpack_read(opb,1)!=1)goto err_out; /* top level EOP check */
289
290
return(0);
291
err_out:
292
vorbis_info_clear(vi);
293
return(OV_EBADHEADER);
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}
295
296
/* The Vorbis header is in three packets; the initial small packet in
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the first page that identifies basic parameters, a second packet
298
with bitstream comments and a third packet that holds the
299
codebook. */
300
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int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){
302
oggpack_buffer opb;
303
304
if(op){
305
oggpack_readinit(&opb,op->packet);
306
307
/* Which of the three types of header is this? */
308
/* Also verify header-ness, vorbis */
309
{
310
char buffer[6];
311
int packtype=oggpack_read(&opb,8);
312
memset(buffer,0,6);
313
_v_readstring(&opb,buffer,6);
314
if(memcmp(buffer,"vorbis",6)){
315
/* not a vorbis header */
316
return(OV_ENOTVORBIS);
317
}
318
switch(packtype){
319
case 0x01: /* least significant *bit* is read first */
320
if(!op->b_o_s){
321
/* Not the initial packet */
322
return(OV_EBADHEADER);
323
}
324
if(vi->rate!=0){
325
/* previously initialized info header */
326
return(OV_EBADHEADER);
327
}
328
329
return(_vorbis_unpack_info(vi,&opb));
330
331
case 0x03: /* least significant *bit* is read first */
332
if(vi->rate==0){
333
/* um... we didn't get the initial header */
334
return(OV_EBADHEADER);
335
}
336
337
return(_vorbis_unpack_comment(vc,&opb));
338
339
case 0x05: /* least significant *bit* is read first */
340
if(vi->rate==0 || vc->vendor==NULL){
341
/* um... we didn;t get the initial header or comments yet */
342
return(OV_EBADHEADER);
343
}
344
345
return(_vorbis_unpack_books(vi,&opb));
346
347
default:
348
/* Not a valid vorbis header type */
349
return(OV_EBADHEADER);
350
break;
351
}
352
}
353
}
354
return(OV_EBADHEADER);
355
}
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