ref: d4bc9052beb3305d64a353a16641740380eb87af
dir: /sys/src/cmd/audio/libvorbis/analysis.c/
/******************************************************************** * * * 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 1994-2007 * * by the Xiph.Org Foundation http://www.xiph.org/ * * * ******************************************************************** function: single-block PCM analysis mode dispatch last mod: $Id: analysis.c 16226 2009-07-08 06:43:49Z xiphmont $ ********************************************************************/ #include <stdio.h> #include <string.h> #include <math.h> #include <ogg/ogg.h> #include "vorbis/codec.h" #include "codec_internal.h" #include "registry.h" #include "scales.h" #include "os.h" #include "misc.h" /* decides between modes, dispatches to the appropriate mapping. */ int vorbis_analysis(vorbis_block *vb, ogg_packet *op){ int ret,i; vorbis_block_internal *vbi=vb->internal; vb->glue_bits=0; vb->time_bits=0; vb->floor_bits=0; vb->res_bits=0; /* first things first. Make sure encode is ready */ for(i=0;i<PACKETBLOBS;i++) oggpack_reset(vbi->packetblob[i]); /* we only have one mapping type (0), and we let the mapping code itself figure out what soft mode to use. This allows easier bitrate management */ if((ret=_mapping_P[0]->forward(vb))) return(ret); if(op){ if(vorbis_bitrate_managed(vb)) /* The app is using a bitmanaged mode... but not using the bitrate management interface. */ return(OV_EINVAL); op->packet=oggpack_get_buffer(&vb->opb); op->bytes=oggpack_bytes(&vb->opb); op->b_o_s=0; op->e_o_s=vb->eofflag; op->granulepos=vb->granulepos; op->packetno=vb->sequence; /* for sake of completeness */ } return(0); } #ifdef ANALYSIS int analysis_noisy=1; /* there was no great place to put this.... */ void _analysis_output_always(char *base,int i,float *v,int n,int bark,int dB,ogg_int64_t off){ int j; FILE *of; char buffer[80]; sprintf(buffer,"%s_%d.m",base,i); of=fopen(buffer,"w"); if(!of)perror("failed to open data dump file"); for(j=0;j<n;j++){ if(bark){ float b=toBARK((4000.f*j/n)+.25); fprintf(of,"%f ",b); }else if(off!=0) fprintf(of,"%f ",(double)(j+off)/8000.); else fprintf(of,"%f ",(double)j); if(dB){ float val; if(v[j]==0.) val=-140.; else val=todB(v+j); fprintf(of,"%f\n",val); }else{ fprintf(of,"%f\n",v[j]); } } fclose(of); } void _analysis_output(char *base,int i,float *v,int n,int bark,int dB, ogg_int64_t off){ if(analysis_noisy)_analysis_output_always(base,i,v,n,bark,dB,off); } #endif