From 43a97878ce14b72f0981164f87f2e35e14151312 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 11:22:09 +0200 Subject: Adding upstream version 110.0.1. Signed-off-by: Daniel Baumann --- media/libvorbis/lib/envelope.h | 79 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 media/libvorbis/lib/envelope.h (limited to 'media/libvorbis/lib/envelope.h') diff --git a/media/libvorbis/lib/envelope.h b/media/libvorbis/lib/envelope.h new file mode 100644 index 0000000000..2ef60a82ca --- /dev/null +++ b/media/libvorbis/lib/envelope.h @@ -0,0 +1,79 @@ +/******************************************************************** + * * + * 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 and manipulation + + ********************************************************************/ + +#ifndef _V_ENVELOPE_ +#define _V_ENVELOPE_ + +#include "mdct.h" + +#define VE_PRE 16 +#define VE_WIN 4 +#define VE_POST 2 +#define VE_AMP (VE_PRE+VE_POST-1) + +#define VE_BANDS 7 +#define VE_NEARDC 15 + +#define VE_MINSTRETCH 2 /* a bit less than short block */ +#define VE_MAXSTRETCH 12 /* one-third full block */ + +typedef struct { + float ampbuf[VE_AMP]; + int ampptr; + + float nearDC[VE_NEARDC]; + float nearDC_acc; + float nearDC_partialacc; + int nearptr; + +} envelope_filter_state; + +typedef struct { + int begin; + int end; + float *window; + float total; +} envelope_band; + +typedef struct { + int ch; + int winlength; + int searchstep; + float minenergy; + + mdct_lookup mdct; + float *mdct_win; + + envelope_band band[VE_BANDS]; + envelope_filter_state *filter; + int stretch; + + int *mark; + + long storage; + long current; + long curmark; + long cursor; +} envelope_lookup; + +extern void _ve_envelope_init(envelope_lookup *e,vorbis_info *vi); +extern void _ve_envelope_clear(envelope_lookup *e); +extern long _ve_envelope_search(vorbis_dsp_state *v); +extern void _ve_envelope_shift(envelope_lookup *e,long shift); +extern int _ve_envelope_mark(vorbis_dsp_state *v); + + +#endif -- cgit v1.2.3