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 <Catalog.h> 42#include <cstring> 43#include <cstdlib> 44 45#undef B_TRANSLATION_CONTEXT 46#define B_TRANSLATION_CONTEXT "CortexAddOnsNullFilter" 47 48// -------------------------------------------------------- // 49// _NullFilterNode 50// -------------------------------------------------------- // 51 52class _NullFilterNode : 53 public AudioFilterNode { 54 typedef AudioFilterNode _inherited; 55 56public: 57 virtual ~_NullFilterNode() {} 58 _NullFilterNode( 59 const char* name, 60 IAudioOpFactory* opFactory, 61 BMediaAddOn* addOn=0) : 62 BMediaNode(name), 63 AudioFilterNode(name, opFactory, addOn) {} 64 65 // be rather permissive about formats 66 status_t getRequiredFormat( 67 media_format& ioFormat) { 68 69 if(ioFormat.type != B_MEDIA_RAW_AUDIO) 70 return B_MEDIA_BAD_FORMAT; 71 ioFormat.u.raw_audio = media_raw_audio_format::wildcard; 72 ioFormat.u.raw_audio.channel_count = 1; 73 74 return B_OK; 75 } 76 77 status_t getPreferredFormat( 78 media_format& ioFormat) { 79 status_t err = _inherited::getPreferredFormat(ioFormat); 80 if(err < B_OK) 81 return err; 82 83 ioFormat.u.raw_audio.channel_count = 1; 84 return B_OK; 85 } 86}; 87 88 89// -------------------------------------------------------- // 90// instantiation function 91// -------------------------------------------------------- // 92 93extern "C" _EXPORT BMediaAddOn* make_media_addon(image_id image) { 94 return new NullFilterAddOn(image); 95} 96 97// -------------------------------------------------------- // 98// ctor/dtor 99// -------------------------------------------------------- // 100 101//NullFilterAddOn::~NullFilterAddOn() {} 102NullFilterAddOn::NullFilterAddOn(image_id id) : 103 BMediaAddOn(id) {} 104 105// -------------------------------------------------------- // 106// BMediaAddOn impl 107// -------------------------------------------------------- // 108 109status_t NullFilterAddOn::InitCheck( 110 const char** out_failure_text) { 111 return B_OK; 112} 113 114int32 NullFilterAddOn::CountFlavors() { 115 return 1; 116} 117 118status_t NullFilterAddOn::GetFlavorAt( 119 int32 n, 120 const flavor_info** out_info) { 121 if(n) 122 return B_ERROR; 123 124 flavor_info* pInfo = new flavor_info; 125 pInfo->internal_id = n; 126 pInfo->name = B_TRANSLATE("NullFilter"); 127 pInfo->info = 128 B_TRANSLATE("NullFilter (empty test filter).\n" 129 "by Eric Moon (8 September 1999)"); 130 pInfo->kinds = B_BUFFER_CONSUMER | B_BUFFER_PRODUCER | B_CONTROLLABLE; 131 pInfo->flavor_flags = 0; 132 pInfo->possible_count = 0; 133 134 pInfo->in_format_count = 1; 135 media_format* pFormat = new media_format; 136 pFormat->type = B_MEDIA_RAW_AUDIO; 137 pFormat->u.raw_audio = media_raw_audio_format::wildcard; 138 pInfo->in_formats = pFormat; 139 140 pInfo->out_format_count = 1; 141 pFormat = new media_format; 142 pFormat->type = B_MEDIA_RAW_AUDIO; 143 pFormat->u.raw_audio = media_raw_audio_format::wildcard; 144 pInfo->out_formats = pFormat; 145 146 *out_info = pInfo; 147 return B_OK; 148} 149 150BMediaNode* NullFilterAddOn::InstantiateNodeFor( 151 const flavor_info* info, 152 BMessage* config, 153 status_t* out_error) { 154 155 return new _NullFilterNode( 156 "NullFilter", 157 new NullAudioOpFactory(), 158 this); 159} 160 161status_t NullFilterAddOn::GetConfigurationFor( 162 BMediaNode* your_node, 163 BMessage* into_message) { 164 165 // no config yet 166 return B_OK; 167} 168 169 170// END -- NullFilterAddOn.cpp -- 171