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