release/src/router/libvorbis/lib/analysis.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   7  *                                                                  *
   8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: single-block PCM analysis mode dispatch
  14  last mod: $Id: analysis.c 16226 2009-07-08 06:43:49Z xiphmont $
  15
  16  ********************************************************************/
  17
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include <math.h>
  21 #include <ogg/ogg.h>
  22 #include "vorbis/codec.h"
  23 #include "codec_internal.h"
  24 #include "registry.h"
  25 #include "scales.h"
  26 #include "os.h"
  27 #include "misc.h"
  28
  29 /* decides between modes, dispatches to the appropriate mapping. */
  30 int vorbis_analysis(vorbis_block *vb, ogg_packet *op){
  31   int ret,i;
  32   vorbis_block_internal *vbi=vb->internal;
  33
  34   vb->glue_bits=0;
  35   vb->time_bits=0;
  36   vb->floor_bits=0;
  37   vb->res_bits=0;
  38
  39   /* first things first.  Make sure encode is ready */
  40   for(i=0;i<PACKETBLOBS;i++)
  41     oggpack_reset(vbi->packetblob[i]);
  42
  43   /* we only have one mapping type (0), and we let the mapping code
  44      itself figure out what soft mode to use.  This allows easier
  45      bitrate management */
  46
  47   if((ret=_mapping_P[0]->forward(vb)))
  48     return(ret);
  49
  50   if(op){
  51     if(vorbis_bitrate_managed(vb))
  52       /* The app is using a bitmanaged mode... but not using the
  53          bitrate management interface. */
  54       return(OV_EINVAL);
  55
  56     op->packet=oggpack_get_buffer(&vb->opb);
  57     op->bytes=oggpack_bytes(&vb->opb);
  58     op->b_o_s=0;
  59     op->e_o_s=vb->eofflag;
  60     op->granulepos=vb->granulepos;
  61     op->packetno=vb->sequence; /* for sake of completeness */
  62   }
  63   return(0);
  64 }
  65
  66 #ifdef ANALYSIS
  67 int analysis_noisy=1;
  68
  69 /* there was no great place to put this.... */
  70 void _analysis_output_always(char *base,int i,float *v,int n,int bark,int dB,ogg_int64_t off){
  71   int j;
  72   FILE *of;
  73   char buffer[80];
  74
  75   sprintf(buffer,"%s_%d.m",base,i);
  76   of=fopen(buffer,"w");
  77
  78   if(!of)perror("failed to open data dump file");
  79
  80   for(j=0;j<n;j++){
  81     if(bark){
  82       float b=toBARK((4000.f*j/n)+.25);
  83       fprintf(of,"%f ",b);
  84     }else
  85       if(off!=0)
  86         fprintf(of,"%f ",(double)(j+off)/8000.);
  87       else
  88         fprintf(of,"%f ",(double)j);
  89
  90     if(dB){
  91       float val;
  92       if(v[j]==0.)
  93         val=-140.;
  94       else
  95         val=todB(v+j);
  96       fprintf(of,"%f\n",val);
  97     }else{
  98       fprintf(of,"%f\n",v[j]);
  99     }
 100   }
 101   fclose(of);
 102 }
 103
 104 void _analysis_output(char *base,int i,float *v,int n,int bark,int dB,
 105                       ogg_int64_t off){
 106   if(analysis_noisy)_analysis_output_always(base,i,v,n,bark,dB,off);
 107 }
 108
 109 #endif
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