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Last change
on this file since 98322 was 96468, checked in by vboxsync, 2 years ago |
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libs/libvorbis-1.3.7: Re-exporting, hopefully this time everything is there. bugref:10275
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File size:
2.1 KB
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| 1 | /********************************************************************
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| 2 | * *
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| 3 | * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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| 4 | * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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| 5 | * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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| 6 | * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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| 7 | * *
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| 8 | * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
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| 9 | * by the Xiph.Org Foundation https://xiph.org/ *
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| 10 | * *
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| 11 | ********************************************************************
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| 12 |
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| 13 | function: PCM data envelope analysis and manipulation
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| 14 |
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| 15 | ********************************************************************/
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| 16 |
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| 17 | #ifndef _V_ENVELOPE_
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| 18 | #define _V_ENVELOPE_
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| 19 |
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| 20 | #include "mdct.h"
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| 21 |
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| 22 | #define VE_PRE 16
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| 23 | #define VE_WIN 4
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| 24 | #define VE_POST 2
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| 25 | #define VE_AMP (VE_PRE+VE_POST-1)
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| 26 |
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| 27 | #define VE_BANDS 7
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| 28 | #define VE_NEARDC 15
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| 29 |
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| 30 | #define VE_MINSTRETCH 2 /* a bit less than short block */
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| 31 | #define VE_MAXSTRETCH 12 /* one-third full block */
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| 32 |
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| 33 | typedef struct {
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| 34 | float ampbuf[VE_AMP];
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| 35 | int ampptr;
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| 36 |
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| 37 | float nearDC[VE_NEARDC];
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| 38 | float nearDC_acc;
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| 39 | float nearDC_partialacc;
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| 40 | int nearptr;
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| 41 |
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| 42 | } envelope_filter_state;
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| 43 |
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| 44 | typedef struct {
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| 45 | int begin;
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| 46 | int end;
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| 47 | float *window;
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| 48 | float total;
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| 49 | } envelope_band;
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| 50 |
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| 51 | typedef struct {
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| 52 | int ch;
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| 53 | int winlength;
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| 54 | int searchstep;
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| 55 | float minenergy;
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| 56 |
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| 57 | mdct_lookup mdct;
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| 58 | float *mdct_win;
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| 59 |
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| 60 | envelope_band band[VE_BANDS];
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| 61 | envelope_filter_state *filter;
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| 62 | int stretch;
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| 63 |
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| 64 | int *mark;
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| 65 |
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| 66 | long storage;
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| 67 | long current;
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| 68 | long curmark;
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| 69 | long cursor;
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| 70 | } envelope_lookup;
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| 71 |
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| 72 | extern void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi);
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| 73 | extern void _ve_envelope_clear(envelope_lookup *e);
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| 74 | extern long _ve_envelope_search(vorbis_dsp_state *v);
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| 75 | extern void _ve_envelope_shift(envelope_lookup *e,long shift);
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| 76 | extern int _ve_envelope_mark(vorbis_dsp_state *v);
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| 77 |
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| 78 |
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| 79 | #endif
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