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 // NullAudioOp.cpp 33 34 #include "NullAudioOp.h" 35 #include "IAudioOp.h" 36 #include "IParameterSet.h" 37 38 #include <Debug.h> 39 #include <ParameterWeb.h> 40 41 // -------------------------------------------------------- // 42 // _NullAudioOp 43 // -------------------------------------------------------- // 44 45 class _NullAudioOp : 46 public IAudioOp { 47 public: 48 _NullAudioOp( 49 IAudioOpHost* _host) : 50 IAudioOp(_host) {} 51 52 uint32 process( 53 const AudioBuffer& source, 54 AudioBuffer& destination, 55 double& sourceOffset, 56 uint32& destinationOffset, 57 uint32 framesRequired, 58 bigtime_t performanceTime) { 59 60 return framesRequired; 61 } 62 63 void replace( 64 IAudioOp* oldOp) { 65 delete oldOp; 66 } 67 }; 68 69 // -------------------------------------------------------- // 70 // _NullParameterSet 71 // -------------------------------------------------------- // 72 73 class _NullParameterSet : 74 public IParameterSet { 75 public: 76 status_t store( 77 int32 parameterID, 78 void* data, 79 size_t size) { return B_ERROR; } 80 81 status_t retrieve( 82 int32 parameterID, 83 void* data, 84 size_t* ioSize) { return B_ERROR; } 85 86 // implement this hook to return a BParameterGroup representing 87 // the parameters represented by this set 88 89 void populateGroup( 90 BParameterGroup* group) { 91 // 92 // group->MakeNullParameter( 93 // 0, 94 // B_MEDIA_NO_TYPE, 95 // "NullFilter has no parameters", 96 // B_GENERIC); 97 } 98 }; 99 100 // -------------------------------------------------------- // 101 // NullAudioOpFactory impl. 102 // -------------------------------------------------------- // 103 104 IAudioOp* NullAudioOpFactory::createOp( 105 IAudioOpHost* host, 106 const media_raw_audio_format& inputFormat, 107 const media_raw_audio_format& outputFormat) { 108 109 return new _NullAudioOp(host); 110 } 111 112 IParameterSet* NullAudioOpFactory::createParameterSet() { 113 return new _NullParameterSet(); 114 } 115 116 117 // END -- NullAudioOp.cpp --