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-rw-r--r--contrib/vorbis/lib/floor0.c223
1 files changed, 223 insertions, 0 deletions
diff --git a/contrib/vorbis/lib/floor0.c b/contrib/vorbis/lib/floor0.c
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+++ b/contrib/vorbis/lib/floor0.c
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+/********************************************************************
+ * *
+ * 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: floor backend 0 implementation
+
+ ********************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <ogg/ogg.h>
+#include "vorbis/codec.h"
+#include "codec_internal.h"
+#include "registry.h"
+#include "lpc.h"
+#include "lsp.h"
+#include "codebook.h"
+#include "scales.h"
+#include "misc.h"
+#include "os.h"
+
+#include "misc.h"
+#include <stdio.h>
+
+typedef struct {
+ int ln;
+ int m;
+ int **linearmap;
+ int n[2];
+
+ vorbis_info_floor0 *vi;
+
+ long bits;
+ long frames;
+} vorbis_look_floor0;
+
+
+/***********************************************/
+
+static void floor0_free_info(vorbis_info_floor *i){
+ vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
+ if(info){
+ memset(info,0,sizeof(*info));
+ _ogg_free(info);
+ }
+}
+
+static void floor0_free_look(vorbis_look_floor *i){
+ vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
+ if(look){
+
+ if(look->linearmap){
+
+ if(look->linearmap[0])_ogg_free(look->linearmap[0]);
+ if(look->linearmap[1])_ogg_free(look->linearmap[1]);
+
+ _ogg_free(look->linearmap);
+ }
+ memset(look,0,sizeof(*look));
+ _ogg_free(look);
+ }
+}
+
+static vorbis_info_floor *floor0_unpack (vorbis_info *vi,oggpack_buffer *opb){
+ codec_setup_info *ci=vi->codec_setup;
+ int j;
+
+ vorbis_info_floor0 *info=_ogg_malloc(sizeof(*info));
+ info->order=oggpack_read(opb,8);
+ info->rate=oggpack_read(opb,16);
+ info->barkmap=oggpack_read(opb,16);
+ info->ampbits=oggpack_read(opb,6);
+ info->ampdB=oggpack_read(opb,8);
+ info->numbooks=oggpack_read(opb,4)+1;
+
+ if(info->order<1)goto err_out;
+ if(info->rate<1)goto err_out;
+ if(info->barkmap<1)goto err_out;
+ if(info->numbooks<1)goto err_out;
+
+ for(j=0;j<info->numbooks;j++){
+ info->books[j]=oggpack_read(opb,8);
+ if(info->books[j]<0 || info->books[j]>=ci->books)goto err_out;
+ if(ci->book_param[info->books[j]]->maptype==0)goto err_out;
+ if(ci->book_param[info->books[j]]->dim<1)goto err_out;
+ }
+ return(info);
+
+ err_out:
+ floor0_free_info(info);
+ return(NULL);
+}
+
+/* initialize Bark scale and normalization lookups. We could do this
+ with static tables, but Vorbis allows a number of possible
+ combinations, so it's best to do it computationally.
+
+ The below is authoritative in terms of defining scale mapping.
+ Note that the scale depends on the sampling rate as well as the
+ linear block and mapping sizes */
+
+static void floor0_map_lazy_init(vorbis_block *vb,
+ vorbis_info_floor *infoX,
+ vorbis_look_floor0 *look){
+ if(!look->linearmap[vb->W]){
+ vorbis_dsp_state *vd=vb->vd;
+ vorbis_info *vi=vd->vi;
+ codec_setup_info *ci=vi->codec_setup;
+ vorbis_info_floor0 *info=(vorbis_info_floor0 *)infoX;
+ int W=vb->W;
+ int n=ci->blocksizes[W]/2,j;
+
+ /* we choose a scaling constant so that:
+ floor(bark(rate/2-1)*C)=mapped-1
+ floor(bark(rate/2)*C)=mapped */
+ float scale=look->ln/toBARK(info->rate/2.f);
+
+ /* the mapping from a linear scale to a smaller bark scale is
+ straightforward. We do *not* make sure that the linear mapping
+ does not skip bark-scale bins; the decoder simply skips them and
+ the encoder may do what it wishes in filling them. They're
+ necessary in some mapping combinations to keep the scale spacing
+ accurate */
+ look->linearmap[W]=_ogg_malloc((n+1)*sizeof(**look->linearmap));
+ for(j=0;j<n;j++){
+ int val=floor( toBARK((info->rate/2.f)/n*j)
+ *scale); /* bark numbers represent band edges */
+ if(val>=look->ln)val=look->ln-1; /* guard against the approximation */
+ look->linearmap[W][j]=val;
+ }
+ look->linearmap[W][j]=-1;
+ look->n[W]=n;
+ }
+}
+
+static vorbis_look_floor *floor0_look(vorbis_dsp_state *vd,
+ vorbis_info_floor *i){
+ vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
+ vorbis_look_floor0 *look=_ogg_calloc(1,sizeof(*look));
+
+ (void)vd;
+
+ look->m=info->order;
+ look->ln=info->barkmap;
+ look->vi=info;
+
+ look->linearmap=_ogg_calloc(2,sizeof(*look->linearmap));
+
+ return look;
+}
+
+static void *floor0_inverse1(vorbis_block *vb,vorbis_look_floor *i){
+ vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
+ vorbis_info_floor0 *info=look->vi;
+ int j,k;
+
+ int ampraw=oggpack_read(&vb->opb,info->ampbits);
+ if(ampraw>0){ /* also handles the -1 out of data case */
+ long maxval=(1<<info->ampbits)-1;
+ float amp=(float)ampraw/maxval*info->ampdB;
+ int booknum=oggpack_read(&vb->opb,ov_ilog(info->numbooks));
+
+ if(booknum!=-1 && booknum<info->numbooks){ /* be paranoid */
+ codec_setup_info *ci=vb->vd->vi->codec_setup;
+ codebook *b=ci->fullbooks+info->books[booknum];
+ float last=0.f;
+
+ /* the additional b->dim is a guard against any possible stack
+ smash; b->dim is provably more than we can overflow the
+ vector */
+ float *lsp=_vorbis_block_alloc(vb,sizeof(*lsp)*(look->m+b->dim+1));
+
+ if(vorbis_book_decodev_set(b,lsp,&vb->opb,look->m)==-1)goto eop;
+ for(j=0;j<look->m;){
+ for(k=0;j<look->m && k<b->dim;k++,j++)lsp[j]+=last;
+ last=lsp[j-1];
+ }
+
+ lsp[look->m]=amp;
+ return(lsp);
+ }
+ }
+ eop:
+ return(NULL);
+}
+
+static int floor0_inverse2(vorbis_block *vb,vorbis_look_floor *i,
+ void *memo,float *out){
+ vorbis_look_floor0 *look=(vorbis_look_floor0 *)i;
+ vorbis_info_floor0 *info=look->vi;
+
+ floor0_map_lazy_init(vb,info,look);
+
+ if(memo){
+ float *lsp=(float *)memo;
+ float amp=lsp[look->m];
+
+ /* take the coefficients back to a spectral envelope curve */
+ vorbis_lsp_to_curve(out,
+ look->linearmap[vb->W],
+ look->n[vb->W],
+ look->ln,
+ lsp,look->m,amp,(float)info->ampdB);
+ return(1);
+ }
+ memset(out,0,sizeof(*out)*look->n[vb->W]);
+ return(0);
+}
+
+/* export hooks */
+const vorbis_func_floor floor0_exportbundle={
+ NULL,&floor0_unpack,&floor0_look,&floor0_free_info,
+ &floor0_free_look,&floor0_inverse1,&floor0_inverse2
+};
generated by cgit v1.1 at 2024-05-18 19:58:01 +0000