1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright (c) 1993-2001 by Sun Microsystems, Inc. 24*0Sstevel@tonic-gate * All rights reserved. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #ifndef _MULTIMEDIA_AUDIOGAIN_H 28*0Sstevel@tonic-gate #define _MULTIMEDIA_AUDIOGAIN_H 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 31*0Sstevel@tonic-gate 32*0Sstevel@tonic-gate #include <AudioTypePcm.h> 33*0Sstevel@tonic-gate 34*0Sstevel@tonic-gate #ifdef __cplusplus 35*0Sstevel@tonic-gate extern "C" { 36*0Sstevel@tonic-gate #endif 37*0Sstevel@tonic-gate 38*0Sstevel@tonic-gate // Class to handle gain calculations 39*0Sstevel@tonic-gate 40*0Sstevel@tonic-gate // Define bits for AudioGain::Process() type argument 41*0Sstevel@tonic-gate #define AUDIO_GAIN_INSTANT (1) // Gain for level meter 42*0Sstevel@tonic-gate #define AUDIO_GAIN_WEIGHTED (2) // Gain for agc 43*0Sstevel@tonic-gate 44*0Sstevel@tonic-gate 45*0Sstevel@tonic-gate class AudioGain { 46*0Sstevel@tonic-gate protected: 47*0Sstevel@tonic-gate 48*0Sstevel@tonic-gate static const double LoSigInstantRange; // normalization constants 49*0Sstevel@tonic-gate static const double HiSigInstantRange; 50*0Sstevel@tonic-gate static const double NoSigWeight; 51*0Sstevel@tonic-gate static const double LoSigWeightRange; 52*0Sstevel@tonic-gate static const double HiSigWeightRange; 53*0Sstevel@tonic-gate static const double PeakSig; 54*0Sstevel@tonic-gate static const double DCtimeconstant; // DC offset time constant 55*0Sstevel@tonic-gate 56*0Sstevel@tonic-gate AudioTypePcm float_convert; // used in signal processing 57*0Sstevel@tonic-gate unsigned clipcnt; // clip counter 58*0Sstevel@tonic-gate Double DCaverage; // weighted DC offset 59*0Sstevel@tonic-gate Double instant_gain; // current (instantaneous) gain 60*0Sstevel@tonic-gate Double weighted_peaksum; // peak weighted sum 61*0Sstevel@tonic-gate Double weighted_sum; // running sum of squares 62*0Sstevel@tonic-gate Double weighted_avgsum; // accumulated sums to averages 63*0Sstevel@tonic-gate unsigned weighted_cnt; // number of sums to average 64*0Sstevel@tonic-gate double *gain_cache; // weighted gains 65*0Sstevel@tonic-gate Double gain_cache_size; // number of cached gains 66*0Sstevel@tonic-gate 67*0Sstevel@tonic-gate protected: 68*0Sstevel@tonic-gate // Internal processing methods 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate // filter DC bias 71*0Sstevel@tonic-gate virtual void process_dcfilter( 72*0Sstevel@tonic-gate AudioBuffer*); 73*0Sstevel@tonic-gate // calculate instant gain 74*0Sstevel@tonic-gate virtual void process_instant( 75*0Sstevel@tonic-gate AudioBuffer*); 76*0Sstevel@tonic-gate // calculate weighted gain 77*0Sstevel@tonic-gate virtual void process_weighted( 78*0Sstevel@tonic-gate AudioBuffer*); 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate public: 81*0Sstevel@tonic-gate AudioGain(); // Constructor 82*0Sstevel@tonic-gate virtual ~AudioGain(); // Destructor 83*0Sstevel@tonic-gate 84*0Sstevel@tonic-gate // TRUE if conversion ok 85*0Sstevel@tonic-gate virtual Boolean CanConvert( 86*0Sstevel@tonic-gate const AudioHdr&) const; // type to check against 87*0Sstevel@tonic-gate 88*0Sstevel@tonic-gate // Process new audio data 89*0Sstevel@tonic-gate virtual AudioError Process( 90*0Sstevel@tonic-gate AudioBuffer*, int); // buffer destroyed if not referenced! 91*0Sstevel@tonic-gate virtual double InstantGain(); // Get most recent gain 92*0Sstevel@tonic-gate virtual double WeightedGain(); // Get current weighted gain 93*0Sstevel@tonic-gate virtual double WeightedPeak(); // Get peak weighted gain 94*0Sstevel@tonic-gate virtual Boolean Clipped(); // TRUE if peak since last check 95*0Sstevel@tonic-gate virtual void Flush(); // Reset state 96*0Sstevel@tonic-gate }; 97*0Sstevel@tonic-gate 98*0Sstevel@tonic-gate #ifdef __cplusplus 99*0Sstevel@tonic-gate } 100*0Sstevel@tonic-gate #endif 101*0Sstevel@tonic-gate 102*0Sstevel@tonic-gate #endif /* !_MULTIMEDIA_AUDIOGAIN_H */ 103