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// NullFilterAddOn.cpp 33 34#include "NullFilterAddOn.h" 35 36#include "AudioFilterNode.h" 37#include "NullAudioOp.h" 38 39#include <Entry.h> 40#include <Debug.h> 41#include <cstring> 42#include <cstdlib> 43 44// -------------------------------------------------------- // 45// _NullFilterNode 46// -------------------------------------------------------- // 47 48class _NullFilterNode : 49 public AudioFilterNode { 50 typedef AudioFilterNode _inherited; 51 52public: 53 virtual ~_NullFilterNode() {} 54 _NullFilterNode( 55 const char* name, 56 IAudioOpFactory* opFactory, 57 BMediaAddOn* addOn=0) : 58 BMediaNode(name), 59 AudioFilterNode(name, opFactory, addOn) {} 60 61 // be rather permissive about formats 62 status_t getRequiredFormat( 63 media_format& ioFormat) { 64 65 if(ioFormat.type != B_MEDIA_RAW_AUDIO) 66 return B_MEDIA_BAD_FORMAT; 67 ioFormat.u.raw_audio = media_raw_audio_format::wildcard; 68 ioFormat.u.raw_audio.channel_count = 1; 69 70 return B_OK; 71 } 72 73 status_t getPreferredFormat( 74 media_format& ioFormat) { 75 status_t err = _inherited::getPreferredFormat(ioFormat); 76 if(err < B_OK) 77 return err; 78 79 ioFormat.u.raw_audio.channel_count = 1; 80 return B_OK; 81 } 82}; 83 84 85// -------------------------------------------------------- // 86// instantiation function 87// -------------------------------------------------------- // 88 89extern "C" _EXPORT BMediaAddOn* make_media_addon(image_id image) { 90 return new NullFilterAddOn(image); 91} 92 93// -------------------------------------------------------- // 94// ctor/dtor 95// -------------------------------------------------------- // 96 97//NullFilterAddOn::~NullFilterAddOn() {} 98NullFilterAddOn::NullFilterAddOn(image_id id) : 99 BMediaAddOn(id) {} 100 101// -------------------------------------------------------- // 102// BMediaAddOn impl 103// -------------------------------------------------------- // 104 105status_t NullFilterAddOn::InitCheck( 106 const char** out_failure_text) { 107 return B_OK; 108} 109 110int32 NullFilterAddOn::CountFlavors() { 111 return 1; 112} 113 114status_t NullFilterAddOn::GetFlavorAt( 115 int32 n, 116 const flavor_info** out_info) { 117 if(n) 118 return B_ERROR; 119 120 flavor_info* pInfo = new flavor_info; 121 pInfo->internal_id = n; 122 pInfo->name = "NullFilter"; 123 pInfo->info = 124 "NullFilter (empty test filter).\n" 125 "by Eric Moon (8 September 1999)"; 126 pInfo->kinds = B_BUFFER_CONSUMER | B_BUFFER_PRODUCER | B_CONTROLLABLE; 127 pInfo->flavor_flags = 0; 128 pInfo->possible_count = 0; 129 130 pInfo->in_format_count = 1; 131 media_format* pFormat = new media_format; 132 pFormat->type = B_MEDIA_RAW_AUDIO; 133 pFormat->u.raw_audio = media_raw_audio_format::wildcard; 134 pInfo->in_formats = pFormat; 135 136 pInfo->out_format_count = 1; 137 pFormat = new media_format; 138 pFormat->type = B_MEDIA_RAW_AUDIO; 139 pFormat->u.raw_audio = media_raw_audio_format::wildcard; 140 pInfo->out_formats = pFormat; 141 142 *out_info = pInfo; 143 return B_OK; 144} 145 146BMediaNode* NullFilterAddOn::InstantiateNodeFor( 147 const flavor_info* info, 148 BMessage* config, 149 status_t* out_error) { 150 151 return new _NullFilterNode( 152 "NullFilter", 153 new NullAudioOpFactory(), 154 this); 155} 156 157status_t NullFilterAddOn::GetConfigurationFor( 158 BMediaNode* your_node, 159 BMessage* into_message) { 160 161 // no config yet 162 return B_OK; 163} 164 165 166// END -- NullFilterAddOn.cpp --