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665 lines
19 KiB
C
665 lines
19 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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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 SOURCE CODE IS (C) COPYRIGHT 1994-2010 *
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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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last mod: $Id: info.c 17584 2010-11-01 19:26:16Z xiphmont $
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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/ogg.h>
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#include "vorbis/codec.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 "psy.h"
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#include "misc.h"
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#include "os.h"
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#define GENERAL_VENDOR_STRING "Xiph.Org libVorbis 1.3.2"
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#define ENCODE_VENDOR_STRING "Xiph.Org libVorbis I 20101101 (Schaufenugget)"
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/* helpers */
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static int ilog2(unsigned int v){
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int ret=0;
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if(v)--v;
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while(v){
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ret++;
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v>>=1;
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}
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return(ret);
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}
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static void _v_writestring(oggpack_buffer *o,const char *s, int bytes){
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while(bytes--){
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oggpack_write(o,*s++,8);
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}
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}
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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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void vorbis_comment_add(vorbis_comment *vc,const char *comment){
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vc->user_comments=_ogg_realloc(vc->user_comments,
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(vc->comments+2)*sizeof(*vc->user_comments));
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vc->comment_lengths=_ogg_realloc(vc->comment_lengths,
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(vc->comments+2)*sizeof(*vc->comment_lengths));
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vc->comment_lengths[vc->comments]=strlen(comment);
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vc->user_comments[vc->comments]=_ogg_malloc(vc->comment_lengths[vc->comments]+1);
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strcpy(vc->user_comments[vc->comments], comment);
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vc->comments++;
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vc->user_comments[vc->comments]=NULL;
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}
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void vorbis_comment_add_tag(vorbis_comment *vc, const char *tag, const char *contents){
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char *comment=alloca(strlen(tag)+strlen(contents)+2); /* +2 for = and \0 */
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strcpy(comment, tag);
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strcat(comment, "=");
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strcat(comment, contents);
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vorbis_comment_add(vc, comment);
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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, const 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 = 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, const 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 = 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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if(vc->user_comments){
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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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_ogg_free(vc->user_comments);
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}
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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 guaranteed 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 = 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=_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=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]) /* this may be cleaning up an aborted
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unpack, in which case the below type
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cannot be trusted */
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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]) /* this may be cleaning up an aborted
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unpack, in which case the below type
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cannot be trusted */
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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]) /* this may be cleaning up an aborted
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unpack, in which case the below type
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cannot be trusted */
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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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for(i=0;i<ci->psys;i++)
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_vi_psy_free(ci->psy_param[i]);
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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=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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if(vendorlen>opb->storage-8)goto err_out;
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vc->vendor=_ogg_calloc(vendorlen+1,1);
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_v_readstring(opb,vc->vendor,vendorlen);
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i=oggpack_read(opb,32);
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if(i<0)goto err_out;
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if(i>((opb->storage-oggpack_bytes(opb))>>2))goto err_out;
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vc->comments=i;
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vc->user_comments=_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments));
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vc->comment_lengths=_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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if(len>opb->storage-oggpack_bytes(opb))goto err_out;
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vc->comment_lengths[i]=len;
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vc->user_comments[i]=_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=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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if(ci->books<=0)goto err_out;
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for(i=0;i<ci->books;i++){
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ci->book_param[i]=vorbis_staticbook_unpack(opb);
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if(!ci->book_param[i])goto err_out;
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}
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/* time backend settings; hooks are unused */
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{
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int times=oggpack_read(opb,6)+1;
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if(times<=0)goto err_out;
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for(i=0;i<times;i++){
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int test=oggpack_read(opb,16);
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if(test<0 || test>=VI_TIMEB)goto err_out;
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}
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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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if(ci->floors<=0)goto err_out;
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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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if(ci->residues<=0)goto err_out;
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for(i=0;i<ci->residues;i++){
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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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if(ci->maps<=0)goto err_out;
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for(i=0;i<ci->maps;i++){
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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);
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if(!ci->map_param[i])goto err_out;
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}
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/* mode settings */
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ci->modes=oggpack_read(opb,6)+1;
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if(ci->modes<=0)goto err_out;
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for(i=0;i<ci->modes;i++){
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ci->mode_param[i]=_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;
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if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out;
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if(ci->mode_param[i]->mapping>=ci->maps)goto err_out;
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if(ci->mode_param[i]->mapping<0)goto err_out;
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}
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if(oggpack_read(opb,1)!=1)goto err_out; /* top level 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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/* Is this packet a vorbis ID header? */
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int vorbis_synthesis_idheader(ogg_packet *op){
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oggpack_buffer opb;
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char buffer[6];
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if(op){
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oggpack_readinit(&opb,op->packet,op->bytes);
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if(!op->b_o_s)
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return(0); /* Not the initial packet */
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if(oggpack_read(&opb,8) != 1)
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return 0; /* not an ID header */
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memset(buffer,0,6);
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_v_readstring(&opb,buffer,6);
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if(memcmp(buffer,"vorbis",6))
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return 0; /* not vorbis */
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return 1;
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}
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return 0;
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}
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/* 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
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with bitstream comments and a third packet that holds the
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codebook. */
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int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){
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oggpack_buffer opb;
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if(op){
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oggpack_readinit(&opb,op->packet,op->bytes);
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/* Which of the three types of header is this? */
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/* Also verify header-ness, vorbis */
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{
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char buffer[6];
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int packtype=oggpack_read(&opb,8);
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memset(buffer,0,6);
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_v_readstring(&opb,buffer,6);
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if(memcmp(buffer,"vorbis",6)){
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/* not a vorbis header */
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return(OV_ENOTVORBIS);
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}
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switch(packtype){
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case 0x01: /* least significant *bit* is read first */
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if(!op->b_o_s){
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/* Not the initial packet */
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return(OV_EBADHEADER);
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}
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if(vi->rate!=0){
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/* previously initialized info header */
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return(OV_EBADHEADER);
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}
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return(_vorbis_unpack_info(vi,&opb));
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case 0x03: /* least significant *bit* is read first */
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if(vi->rate==0){
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/* um... we didn't get the initial header */
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return(OV_EBADHEADER);
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}
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return(_vorbis_unpack_comment(vc,&opb));
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case 0x05: /* least significant *bit* is read first */
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if(vi->rate==0 || vc->vendor==NULL){
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/* um... we didn;t get the initial header or comments yet */
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return(OV_EBADHEADER);
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}
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return(_vorbis_unpack_books(vi,&opb));
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default:
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/* Not a valid vorbis header type */
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return(OV_EBADHEADER);
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break;
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}
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}
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}
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return(OV_EBADHEADER);
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}
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/* pack side **********************************************************/
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static int _vorbis_pack_info(oggpack_buffer *opb,vorbis_info *vi){
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codec_setup_info *ci=vi->codec_setup;
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if(!ci)return(OV_EFAULT);
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/* preamble */
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oggpack_write(opb,0x01,8);
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_v_writestring(opb,"vorbis", 6);
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/* basic information about the stream */
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oggpack_write(opb,0x00,32);
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oggpack_write(opb,vi->channels,8);
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oggpack_write(opb,vi->rate,32);
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oggpack_write(opb,vi->bitrate_upper,32);
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oggpack_write(opb,vi->bitrate_nominal,32);
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oggpack_write(opb,vi->bitrate_lower,32);
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oggpack_write(opb,ilog2(ci->blocksizes[0]),4);
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oggpack_write(opb,ilog2(ci->blocksizes[1]),4);
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oggpack_write(opb,1,1);
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return(0);
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}
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static int _vorbis_pack_comment(oggpack_buffer *opb,vorbis_comment *vc){
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int bytes = strlen(ENCODE_VENDOR_STRING);
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/* preamble */
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oggpack_write(opb,0x03,8);
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_v_writestring(opb,"vorbis", 6);
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/* vendor */
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oggpack_write(opb,bytes,32);
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_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)) 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;
|
|
|
|
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){
|
|
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){
|
|
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;
|
|
}
|