1/* 2 * Copyright (c) 1999-2000, Eric Moon. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions, and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions, and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 27 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 32// IAudioFilterOpFactory.h 33// * PURPOSE 34// An interface to an 'algorithm finder' object. Implementations 35// of IFAudioilterOpFactory are given format and parameter information, 36// and are required to return the best-matching algorithm (IAudioFilterOp 37// implementation) -- or 0 if no algorithm can handle the given 38// formats. 39// 40// One subclass of IAudioFilterOpFactory should exist for each 41// algorithm family, since create() provides no way to select a 42// particular algorithm. The stock create() should produce an 43// operation initialized to acceptible defaults, but you can 44// always overload create() to provide more options. 45// 46// * UP IN THE AIR +++++ 47// - query mechanism -- determine if a format/parameter change 48// will require an algorithm switch? 49// - explicit parameter support? seems a better approach than 50// overloading the create() method with parameters for each 51// type of filter operation... ? 52// 53// * HISTORY 54// e.moon 26aug99 Begun. 55 56#ifndef __IAudioFilterOpFactory_H__ 57#define __IAudioFilterOpFactory_H__ 58 59#include <MediaDefs.h> 60 61class IAudioFilterOp; 62 63class IAudioFilterOpFactory { 64public: // *** INTERFACE 65 // The basic create method. subclasses devoted to producing 66 // more specialized audio-filter operations may want to override 67 // this with further arguments specific to the task at hand. 68 // Return 0 if no algorithm could be found for the given format. 69 70 virtual IAudioFilterOp* create( 71 const media_raw_audio_format& sourceFormat, 72 const media_raw_audio_format& destinationFormat) =0; 73 74public: // *** HOOKS 75 virtual ~IAudioFilterOpFactory() {} 76 77}; 78 79#endif /*__IAudioFilterOpFactory_H__*/ 80