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source: downloads/libvorbis-1.2.0/lib/analysis.c @ 16

Last change on this file since 16 was 16, checked in by landauf, 16 years ago

added libvorbis

File size: 3.1 KB
Line 
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 13293 2007-07-24 00:09:47Z 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
29int analysis_noisy=1;
30
31/* decides between modes, dispatches to the appropriate mapping. */
32int vorbis_analysis(vorbis_block *vb, ogg_packet *op){
33  int ret,i;
34  vorbis_block_internal *vbi=vb->internal;
35
36  vb->glue_bits=0;
37  vb->time_bits=0;
38  vb->floor_bits=0;
39  vb->res_bits=0;
40
41  /* first things first.  Make sure encode is ready */
42  for(i=0;i<PACKETBLOBS;i++)
43    oggpack_reset(vbi->packetblob[i]);
44 
45  /* we only have one mapping type (0), and we let the mapping code
46     itself figure out what soft mode to use.  This allows easier
47     bitrate management */
48
49  if((ret=_mapping_P[0]->forward(vb)))
50    return(ret);
51
52  if(op){
53    if(vorbis_bitrate_managed(vb))
54      /* The app is using a bitmanaged mode... but not using the
55         bitrate management interface. */
56      return(OV_EINVAL);
57   
58    op->packet=oggpack_get_buffer(&vb->opb);
59    op->bytes=oggpack_bytes(&vb->opb);
60    op->b_o_s=0;
61    op->e_o_s=vb->eofflag;
62    op->granulepos=vb->granulepos;
63    op->packetno=vb->sequence; /* for sake of completeness */
64  }
65  return(0);
66}
67
68/* there was no great place to put this.... */
69void _analysis_output_always(char *base,int i,float *v,int n,int bark,int dB,ogg_int64_t off){
70  int j;
71  FILE *of;
72  char buffer[80];
73
74  /*  if(i==5870){*/
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
105void _analysis_output(char *base,int i,float *v,int n,int bark,int dB,
106                      ogg_int64_t off){
107  if(analysis_noisy)_analysis_output_always(base,i,v,n,bark,dB,off);
108}
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