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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1990-2001 by Sun Microsystems, Inc.
* All rights reserved.
*/
#ifndef _MULTIMEDIA_AUDIODETECT_H
#define _MULTIMEDIA_AUDIODETECT_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <Audio.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Audio sound/silence detection structures and routines */
/*
* An array of AudioDetectPts is returned by the detection algorithms.
* 'Pos' gives the start time of a region. 'Type' give the type of data
* detected in that particular region. The end time of the region is equal
* to the start time of the next region.
* The last entry in the array has type DETECT_EOF.
*/
enum AudioDetectType {
DETECT_EOF, /* end of file marker */
DETECT_SILENCE, /* region of silence */
DETECT_SOUND /* region of detected sound */
/* XXX - may be extended to include */
/* touch-tone and speech detection. */
};
struct AudioDetectPts {
double pos; /* start time of audio region */
enum AudioDetectType type; /* type of audio region */
};
/* Audio detection algorithm tuning parameters */
enum AudioDetectConfig {
DETECT_MINIMUM_SILENCE, /* (double) minimum pause time */
DETECT_MINIMUM_SOUND, /* (double) minimum sound time */
DETECT_THRESHOLD_SCALE, /* (double) 0.(low) - 4.(hi) */
DETECT_NOISE_RATIO /* (double) 0.(low) - 1.(hi) */
};
// Array of detection points
class AudioDetectArray {
private:
unsigned int count; // number of valid points in array
unsigned int size; // number of entries in array
void operator=(AudioDetectArray); // Assignment is illegal
public:
AudioDetectPts* pts; // array ptr
AudioDetectArray(unsigned int cnt = 0); // Constructor
~AudioDetectArray(); // Destructor
// Append points
AudioError appendpts(
AudioDetectPts* newpts, // array to append
unsigned int cnt = -1); // number of points to append
void reduce(); // Eliminate redundancy
AudioError duparray(AudioDetectPts*& cp); // Copy array
};
// Audio detection state structure
class AudioDetect {
private:
void* state; // detection algorithm state
Double min_silence; // length of minimum silence segment
Double min_sound; // length of minimum sound segment
Double thresh_scale; // silence threshold scale
Double noise_ratio; // silence threshold noise ratio
void operator=(AudioDetect); // Assignment is illegal
// Analyze main loop
AudioError analyzeappend(
AudioDetectArray*& aptr, // value array to modify
Audio* obj, // AudioList, or whatever
Double from, // starting offset
Double to, // ending offset
Double mintime); // minimum analysis buffer size
public:
AudioDetect(); // Constructor
~AudioDetect(); // Destructor
// Get detection params
AudioError GetParam(
AudioDetectConfig type, // type flag
Double& val); // return value
// Set detection params
AudioError SetParam(
AudioDetectConfig type, // type flag
Double val); // value
// Analyze silence
AudioError SetNoiseFloor(
Audio* obj); // AudioExtent, or whatever
// Analyze gain level
AudioError AnalyzeGain(
Audio* obj, // AudioExtent, or whatever
Double& val); // return value
// Process data
AudioError Analyze(
AudioDetectPts*& pts, // value array to modify
Audio* obj); // AudioList, or whatever
// Process data
AudioError Analyze(
AudioDetectPts*& pts, // value array to modify
Audio* obj, // AudioList, or whatever
Double from); // starting offset
// Process data
AudioError Analyze(
AudioDetectPts*& pts, // value array to modify
Audio* obj, // AudioList, or whatever
Double from, // starting offset
Double to); // ending offset
};
#ifdef __cplusplus
}
#endif
#endif /* !_MULTIMEDIA_AUDIODETECT_H */
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