1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright (c) 1993-2001 by Sun Microsystems, Inc. 24*7c478bd9Sstevel@tonic-gate * All rights reserved. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate #ifndef _MULTIMEDIA_AUDIOGAIN_H 28*7c478bd9Sstevel@tonic-gate #define _MULTIMEDIA_AUDIOGAIN_H 29*7c478bd9Sstevel@tonic-gate 30*7c478bd9Sstevel@tonic-gate #include <AudioTypePcm.h> 31*7c478bd9Sstevel@tonic-gate 32*7c478bd9Sstevel@tonic-gate #ifdef __cplusplus 33*7c478bd9Sstevel@tonic-gate extern "C" { 34*7c478bd9Sstevel@tonic-gate #endif 35*7c478bd9Sstevel@tonic-gate 36*7c478bd9Sstevel@tonic-gate // Class to handle gain calculations 37*7c478bd9Sstevel@tonic-gate 38*7c478bd9Sstevel@tonic-gate // Define bits for AudioGain::Process() type argument 39*7c478bd9Sstevel@tonic-gate #define AUDIO_GAIN_INSTANT (1) // Gain for level meter 40*7c478bd9Sstevel@tonic-gate #define AUDIO_GAIN_WEIGHTED (2) // Gain for agc 41*7c478bd9Sstevel@tonic-gate 42*7c478bd9Sstevel@tonic-gate 43*7c478bd9Sstevel@tonic-gate class AudioGain { 44*7c478bd9Sstevel@tonic-gate protected: 45*7c478bd9Sstevel@tonic-gate 46*7c478bd9Sstevel@tonic-gate static const double LoSigInstantRange; // normalization constants 47*7c478bd9Sstevel@tonic-gate static const double HiSigInstantRange; 48*7c478bd9Sstevel@tonic-gate static const double NoSigWeight; 49*7c478bd9Sstevel@tonic-gate static const double LoSigWeightRange; 50*7c478bd9Sstevel@tonic-gate static const double HiSigWeightRange; 51*7c478bd9Sstevel@tonic-gate static const double PeakSig; 52*7c478bd9Sstevel@tonic-gate static const double DCtimeconstant; // DC offset time constant 53*7c478bd9Sstevel@tonic-gate 54*7c478bd9Sstevel@tonic-gate AudioTypePcm float_convert; // used in signal processing 55*7c478bd9Sstevel@tonic-gate unsigned clipcnt; // clip counter 56*7c478bd9Sstevel@tonic-gate Double DCaverage; // weighted DC offset 57*7c478bd9Sstevel@tonic-gate Double instant_gain; // current (instantaneous) gain 58*7c478bd9Sstevel@tonic-gate Double weighted_peaksum; // peak weighted sum 59*7c478bd9Sstevel@tonic-gate Double weighted_sum; // running sum of squares 60*7c478bd9Sstevel@tonic-gate Double weighted_avgsum; // accumulated sums to averages 61*7c478bd9Sstevel@tonic-gate unsigned weighted_cnt; // number of sums to average 62*7c478bd9Sstevel@tonic-gate double *gain_cache; // weighted gains 63*7c478bd9Sstevel@tonic-gate Double gain_cache_size; // number of cached gains 64*7c478bd9Sstevel@tonic-gate 65*7c478bd9Sstevel@tonic-gate protected: 66*7c478bd9Sstevel@tonic-gate // Internal processing methods 67*7c478bd9Sstevel@tonic-gate 68*7c478bd9Sstevel@tonic-gate // filter DC bias 69*7c478bd9Sstevel@tonic-gate virtual void process_dcfilter( 70*7c478bd9Sstevel@tonic-gate AudioBuffer*); 71*7c478bd9Sstevel@tonic-gate // calculate instant gain 72*7c478bd9Sstevel@tonic-gate virtual void process_instant( 73*7c478bd9Sstevel@tonic-gate AudioBuffer*); 74*7c478bd9Sstevel@tonic-gate // calculate weighted gain 75*7c478bd9Sstevel@tonic-gate virtual void process_weighted( 76*7c478bd9Sstevel@tonic-gate AudioBuffer*); 77*7c478bd9Sstevel@tonic-gate 78*7c478bd9Sstevel@tonic-gate public: 79*7c478bd9Sstevel@tonic-gate AudioGain(); // Constructor 80*7c478bd9Sstevel@tonic-gate virtual ~AudioGain(); // Destructor 81*7c478bd9Sstevel@tonic-gate 82*7c478bd9Sstevel@tonic-gate // TRUE if conversion ok 83*7c478bd9Sstevel@tonic-gate virtual Boolean CanConvert( 84*7c478bd9Sstevel@tonic-gate const AudioHdr&) const; // type to check against 85*7c478bd9Sstevel@tonic-gate 86*7c478bd9Sstevel@tonic-gate // Process new audio data 87*7c478bd9Sstevel@tonic-gate virtual AudioError Process( 88*7c478bd9Sstevel@tonic-gate AudioBuffer*, int); // buffer destroyed if not referenced! 89*7c478bd9Sstevel@tonic-gate virtual double InstantGain(); // Get most recent gain 90*7c478bd9Sstevel@tonic-gate virtual double WeightedGain(); // Get current weighted gain 91*7c478bd9Sstevel@tonic-gate virtual double WeightedPeak(); // Get peak weighted gain 92*7c478bd9Sstevel@tonic-gate virtual Boolean Clipped(); // TRUE if peak since last check 93*7c478bd9Sstevel@tonic-gate virtual void Flush(); // Reset state 94*7c478bd9Sstevel@tonic-gate }; 95*7c478bd9Sstevel@tonic-gate 96*7c478bd9Sstevel@tonic-gate #ifdef __cplusplus 97*7c478bd9Sstevel@tonic-gate } 98*7c478bd9Sstevel@tonic-gate #endif 99*7c478bd9Sstevel@tonic-gate 100*7c478bd9Sstevel@tonic-gate #endif /* !_MULTIMEDIA_AUDIOGAIN_H */ 101