From 74f4b1bc3b627ba4c7e03498234d88cacdfbe97b Mon Sep 17 00:00:00 2001 From: Aki Date: Wed, 29 Sep 2021 22:52:49 +0200 Subject: Squashed 'vorbis/' content from commit d22c3ab5f git-subtree-dir: vorbis git-subtree-split: d22c3ab5f633460abc2532feee60ca0892134cbf --- lib/floor0.c | 223 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 223 insertions(+) create mode 100644 lib/floor0.c (limited to 'lib/floor0.c') diff --git a/lib/floor0.c b/lib/floor0.c new file mode 100644 index 0000000..443c0e5 --- /dev/null +++ b/lib/floor0.c @@ -0,0 +1,223 @@ +/******************************************************************** + * * + * 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 +#include +#include +#include +#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 + +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;jnumbooks;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;jrate/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<ampbits)-1; + float amp=(float)ampraw/maxval*info->ampdB; + int booknum=oggpack_read(&vb->opb,ov_ilog(info->numbooks)); + + if(booknum!=-1 && booknumnumbooks){ /* 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;jm;){ + for(k=0;jm && kdim;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 +}; -- cgit v1.1