godot/thirdparty/libvorbis/envelope.c

/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
 *                                                                  *
 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
 * by the Xiph.Org Foundation https://xiph.org/                     *
 *                                                                  *
 ********************************************************************

 function: PCM data envelope analysis

 ********************************************************************/

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <ogg/ogg.h>
#include "vorbis/codec.h"
#include "codec_internal.h"

#include "os.h"
#include "scales.h"
#include "envelope.h"
#include "mdct.h"
#include "misc.h"

void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi){ … }

void _ve_envelope_clear(envelope_lookup *e){ … }

/* fairly straight threshhold-by-band based until we find something
   that works better and isn't patented. */

static int _ve_amp(envelope_lookup *ve,
                   vorbis_info_psy_global *gi,
                   float *data,
                   envelope_band *bands,
                   envelope_filter_state *filters){ … }

#if 0
static int seq=0;
static ogg_int64_t totalshift=-1024;
#endif

long _ve_envelope_search(vorbis_dsp_state *v){ … }

int _ve_envelope_mark(vorbis_dsp_state *v){ … }

void _ve_envelope_shift(envelope_lookup *e,long shift){ … }