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comparison: media/libvorbis/lib/envelope.h
media/libvorbis/lib/envelope.h
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| 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 1994-2009 * | |
| 9 * by the Xiph.Org Foundation http://www.xiph.org/ * | |
| 10 * * | |
| 11 ******************************************************************** | |
| 12 | |
| 13 function: PCM data envelope analysis and manipulation | |
| 14 last mod: $Id: envelope.h 16227 2009-07-08 06:58:46Z xiphmont $ | |
| 15 | |
| 16 ********************************************************************/ | |
| 17 | |
| 18 #ifndef _V_ENVELOPE_ | |
| 19 #define _V_ENVELOPE_ | |
| 20 | |
| 21 #include "mdct.h" | |
| 22 | |
| 23 #define VE_PRE 16 | |
| 24 #define VE_WIN 4 | |
| 25 #define VE_POST 2 | |
| 26 #define VE_AMP (VE_PRE+VE_POST-1) | |
| 27 | |
| 28 #define VE_BANDS 7 | |
| 29 #define VE_NEARDC 15 | |
| 30 | |
| 31 #define VE_MINSTRETCH 2 /* a bit less than short block */ | |
| 32 #define VE_MAXSTRETCH 12 /* one-third full block */ | |
| 33 | |
| 34 typedef struct { | |
| 35 float ampbuf[VE_AMP]; | |
| 36 int ampptr; | |
| 37 | |
| 38 float nearDC[VE_NEARDC]; | |
| 39 float nearDC_acc; | |
| 40 float nearDC_partialacc; | |
| 41 int nearptr; | |
| 42 | |
| 43 } envelope_filter_state; | |
| 44 | |
| 45 typedef struct { | |
| 46 int begin; | |
| 47 int end; | |
| 48 float *window; | |
| 49 float total; | |
| 50 } envelope_band; | |
| 51 | |
| 52 typedef struct { | |
| 53 int ch; | |
| 54 int winlength; | |
| 55 int searchstep; | |
| 56 float minenergy; | |
| 57 | |
| 58 mdct_lookup mdct; | |
| 59 float *mdct_win; | |
| 60 | |
| 61 envelope_band band[VE_BANDS]; | |
| 62 envelope_filter_state *filter; | |
| 63 int stretch; | |
| 64 | |
| 65 int *mark; | |
| 66 | |
| 67 long storage; | |
| 68 long current; | |
| 69 long curmark; | |
| 70 long cursor; | |
| 71 } envelope_lookup; | |
| 72 | |
| 73 extern void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi); | |
| 74 extern void _ve_envelope_clear(envelope_lookup *e); | |
| 75 extern long _ve_envelope_search(vorbis_dsp_state *v); | |
| 76 extern void _ve_envelope_shift(envelope_lookup *e,long shift); | |
| 77 extern int _ve_envelope_mark(vorbis_dsp_state *v); | |
| 78 | |
| 79 | |
| 80 #endif |
