Tremolo (an ARM optimised version of the Tremor library for doing Ogg Vorbis decompression)
diff --git a/Tremolo/treminfo.c b/Tremolo/treminfo.c
new file mode 100644
index 0000000..5373885
--- /dev/null
+++ b/Tremolo/treminfo.c
@@ -0,0 +1,348 @@
+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
+ * 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.h"
+#include "ivorbiscodec.h"
+#include "codec_internal.h"
+#include "codebook.h"
+#include "misc.h"
+#include "os.h"
+
+/* helpers */
+static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
+ while(bytes--){
+ *buf++=(char)oggpack_read(o,8);
+ }
+}
+
+void vorbis_comment_init(vorbis_comment *vc){
+ memset(vc,0,sizeof(*vc));
+}
+
+/* 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, char *tag, int count){
+ long i;
+ int found = 0;
+ int taglen = strlen(tag)+1; /* +1 for the = we append */
+ char *fulltag = (char *)alloca(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 */
+ return vc->user_comments[i] + taglen;
+ else
+ found++;
+ }
+ }
+ return NULL; /* didn't find anything */
+}
+
+int vorbis_comment_query_count(vorbis_comment *vc, char *tag){
+ int i,count=0;
+ int taglen = strlen(tag)+1; /* +1 for the = we append */
+ char *fulltag = (char *)alloca(taglen+1);
+ strcpy(fulltag,tag);
+ strcat(fulltag, "=");
+
+ for(i=0;i<vc->comments;i++){
+ if(!tagcompare(vc->user_comments[i], fulltag, taglen))
+ count++;
+ }
+
+ return count;
+}
+
+void vorbis_comment_clear(vorbis_comment *vc){
+ if(vc){
+ long i;
+ for(i=0;i<vc->comments;i++)
+ if(vc->user_comments[i])_ogg_free(vc->user_comments[i]);
+ if(vc->user_comments)_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 guarantted 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 = (codec_setup_info *)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=(codec_setup_info *)_ogg_calloc(1,sizeof(codec_setup_info));
+}
+
+void vorbis_info_clear(vorbis_info *vi){
+ codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
+ int i;
+
+ if(ci){
+
+ if(ci->mode_param)_ogg_free(ci->mode_param);
+
+ if(ci->map_param){
+ for(i=0;i<ci->maps;i++) /* unpack does the range checking */
+ mapping_clear_info(ci->map_param+i);
+ _ogg_free(ci->map_param);
+ }
+
+ if(ci->floor_param){
+ for(i=0;i<ci->floors;i++) /* unpack does the range checking */
+ if(ci->floor_type[i])
+ floor1_free_info(ci->floor_param[i]);
+ else
+ floor0_free_info(ci->floor_param[i]);
+ _ogg_free(ci->floor_param);
+ _ogg_free(ci->floor_type);
+ }
+
+ if(ci->residue_param){
+ for(i=0;i<ci->residues;i++) /* unpack does the range checking */
+ res_clear_info(ci->residue_param+i);
+ _ogg_free(ci->residue_param);
+ }
+
+ if(ci->book_param){
+ for(i=0;i<ci->books;i++)
+ vorbis_book_clear(ci->book_param+i);
+ _ogg_free(ci->book_param);
+ }
+
+ _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=(codec_setup_info *)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=oggpack_read(opb,32);
+ vi->bitrate_nominal=oggpack_read(opb,32);
+ vi->bitrate_lower=oggpack_read(opb,32);
+
+ ci->blocksizes[0]=1<<oggpack_read(opb,4);
+ ci->blocksizes[1]=1<<oggpack_read(opb,4);
+
+#ifdef LIMIT_TO_64kHz
+ if(vi->rate>=64000 || ci->blocksizes[1]>4096)goto err_out;
+#else
+ if(vi->rate<64000 && ci->blocksizes[1]>4096)goto err_out;
+#endif
+
+ 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;
+ vc->vendor=(char *)_ogg_calloc(vendorlen+1,1);
+ _v_readstring(opb,vc->vendor,vendorlen);
+ vc->comments=oggpack_read(opb,32);
+ if(vc->comments<0)goto err_out;
+ vc->user_comments=(char **)_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments));
+ vc->comment_lengths=(int *)_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;
+ vc->comment_lengths[i]=len;
+ vc->user_comments[i]=(char *)_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=(codec_setup_info *)vi->codec_setup;
+ int i;
+ if(!ci)return(OV_EFAULT);
+
+ /* codebooks */
+ ci->books=oggpack_read(opb,8)+1;
+ ci->book_param=(codebook *)_ogg_calloc(ci->books,sizeof(*ci->book_param));
+ for(i=0;i<ci->books;i++)
+ if(vorbis_book_unpack(opb,ci->book_param+i))goto err_out;
+
+ /* time backend settings, not actually used */
+ i=oggpack_read(opb,6);
+ for(;i>=0;i--)
+ if(oggpack_read(opb,16)!=0)goto err_out;
+
+ /* floor backend settings */
+ ci->floors=oggpack_read(opb,6)+1;
+ ci->floor_param=_ogg_malloc(sizeof(*ci->floor_param)*ci->floors);
+ ci->floor_type=_ogg_malloc(sizeof(*ci->floor_type)*ci->floors);
+ for(i=0;i<ci->floors;i++){
+ ci->floor_type[i]=(char)oggpack_read(opb,16);
+ if(ci->floor_type[i]<0 || ci->floor_type[i]>=VI_FLOORB)goto err_out;
+ if(ci->floor_type[i])
+ ci->floor_param[i]=floor1_info_unpack(vi,opb);
+ else
+ ci->floor_param[i]=floor0_info_unpack(vi,opb);
+ if(!ci->floor_param[i])goto err_out;
+ }
+
+ /* residue backend settings */
+ ci->residues=oggpack_read(opb,6)+1;
+ ci->residue_param=_ogg_malloc(sizeof(*ci->residue_param)*ci->residues);
+ for(i=0;i<ci->residues;i++)
+ if(res_unpack(ci->residue_param+i,vi,opb))goto err_out;
+
+ /* map backend settings */
+ ci->maps=oggpack_read(opb,6)+1;
+ ci->map_param=_ogg_malloc(sizeof(*ci->map_param)*ci->maps);
+ for(i=0;i<ci->maps;i++){
+ if(oggpack_read(opb,16)!=0)goto err_out;
+ if(mapping_info_unpack(ci->map_param+i,vi,opb))goto err_out;
+ }
+
+ /* mode settings */
+ ci->modes=oggpack_read(opb,6)+1;
+ ci->mode_param=
+ (vorbis_info_mode *)_ogg_malloc(ci->modes*sizeof(*ci->mode_param));
+ for(i=0;i<ci->modes;i++){
+ ci->mode_param[i].blockflag=(unsigned char)oggpack_read(opb,1);
+ if(oggpack_read(opb,16))goto err_out;
+ if(oggpack_read(opb,16))goto err_out;
+ ci->mode_param[i].mapping=(unsigned char)oggpack_read(opb,8);
+ if(ci->mode_param[i].mapping>=ci->maps)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);
+}
+
+/* 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_dsp_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){
+ oggpack_buffer opb;
+
+ if(op){
+ oggpack_readinit(&opb,op->packet);
+
+ /* 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);
+ }
+
+ 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);
+ }
+
+ return(_vorbis_unpack_books(vi,&opb));
+
+ default:
+ /* Not a valid vorbis header type */
+ return(OV_EBADHEADER);
+ break;
+ }
+ }
+ }
+ return(OV_EBADHEADER);
+}
+