source/includes/CarlaNativePrograms.hpp

   1 /*
   2  * Carla Native Plugin API (C++)
   3  * Copyright (C) 2012-2022 Filipe Coelho <falktx@falktx.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of
   8  * the License, or any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * For a full copy of the GNU General Public License see the doc/GPL.txt file.
  16  */
  17
  18 #ifndef CARLA_NATIVE_PROGRAMS_HPP_INCLUDED
  19 #define CARLA_NATIVE_PROGRAMS_HPP_INCLUDED
  20
  21 #include "CarlaNative.hpp"
  22
  23 #include "CarlaMathUtils.hpp"
  24 #include "CarlaMutex.hpp"
  25
  26 #include "water/files/File.h"
  27 #include "water/memory/SharedResourcePointer.h"
  28 #include "water/text/StringArray.h"
  29
  30 using water::File;
  31 using water::SharedResourcePointer;
  32 using water::String;
  33 using water::StringArray;
  34
  35 /*!
  36  * @defgroup CarlaNativeAPI Carla Native API
  37  * @{
  38  */
  39
  40 // -----------------------------------------------------------------------
  41 // ...
  42
  43 enum FileType {
  44     FileNone,
  45     FileAudio,
  46     FileMIDI,
  47 };
  48
  49 template <FileType fileType>
  50 struct NativePluginPresetManager {
  51     StringArray filenames;
  52
  53     NativePluginPresetManager(const char* const paths, const char* const wildcard)
  54         : filenames()
  55     {
  56         CARLA_SAFE_ASSERT_RETURN(wildcard != nullptr,);
  57
  58         if (paths == nullptr || paths[0] == '\0' || wildcard[0] == '\0')
  59             return;
  60
  61         const StringArray splitPaths(StringArray::fromTokens(paths, CARLA_OS_SPLIT_STR, ""));
  62
  63         for (String *it = splitPaths.begin(), *end = splitPaths.end(); it != end; ++it)
  64         {
  65             std::vector<File> results;
  66
  67             if (const uint count = File(*it).findChildFiles(results, File::findFiles|File::ignoreHiddenFiles, true, wildcard))
  68             {
  69                 for (uint i=0; i<count; ++i)
  70                     filenames.add(results[i].getFullPathName());
  71             }
  72         }
  73
  74         filenames.sort(true);
  75     }
  76 };
  77
  78 // -----------------------------------------------------------------------
  79 // Native Plugin with MIDI programs class
  80
  81 template <FileType fileType>
  82 class NativePluginWithMidiPrograms : public NativePluginClass
  83 {
  84 public:
  85     typedef NativePluginPresetManager<fileType> NativePluginPresetManagerType;
  86     typedef SharedResourcePointer<NativePluginPresetManagerType> NativeMidiPrograms;
  87
  88     NativePluginWithMidiPrograms(const NativeHostDescriptor* const host,
  89                                  const NativeMidiPrograms& programs,
  90                                  const uint32_t numOutputs)
  91         : NativePluginClass(host),
  92           fRetMidiProgram(),
  93           fRetMidiProgramName(),
  94           fNextFilename(nullptr),
  95           fProgramChangeMutex(),
  96           kPrograms(programs),
  97           kNumOutputs(numOutputs) {}
  98
  99 protected:
 100     // -------------------------------------------------------------------
 101     // New Plugin program calls
 102
 103     virtual void setStateFromFile(const char* filename) = 0;
 104     virtual void process2(const float* const* inBuffer, float** outBuffer, uint32_t frames,
 105                           const NativeMidiEvent* midiEvents, uint32_t midiEventCount) = 0;
 106
 107     void invalidateNextFilename() noexcept
 108     {
 109         const CarlaMutexLocker cml(fProgramChangeMutex);
 110         fNextFilename = nullptr;
 111     }
 112
 113     // -------------------------------------------------------------------
 114     // Plugin midi-program calls
 115
 116     uint32_t getMidiProgramCount() const override
 117     {
 118         const NativePluginPresetManagerType& pm(kPrograms.get());
 119         return static_cast<uint32_t>(pm.filenames.size());
 120     }
 121
 122     const NativeMidiProgram* getMidiProgramInfo(const uint32_t uindex) const override
 123     {
 124         const int index = static_cast<int>(uindex);
 125
 126         const NativePluginPresetManagerType& pm(kPrograms.get());
 127         CARLA_SAFE_ASSERT_RETURN(index < pm.filenames.size(), nullptr);
 128
 129         fRetMidiProgramName = File(pm.filenames.strings.getUnchecked(index)).getFileNameWithoutExtension();
 130
 131         fRetMidiProgram.bank = 0;
 132         fRetMidiProgram.program = uindex;
 133         fRetMidiProgram.name = fRetMidiProgramName.toRawUTF8();
 134
 135         return &fRetMidiProgram;
 136     }
 137
 138     // -------------------------------------------------------------------
 139     // Plugin state calls
 140
 141     void setMidiProgram(const uint8_t, const uint32_t, const uint32_t program) override
 142     {
 143         const int iprogram = static_cast<int>(program);
 144
 145         const NativePluginPresetManagerType& pm(kPrograms.get());
 146         CARLA_SAFE_ASSERT_RETURN(iprogram < pm.filenames.size(),);
 147
 148         const char* const filename(pm.filenames.strings.getUnchecked(iprogram).toRawUTF8());
 149
 150         const CarlaMutexLocker cml(fProgramChangeMutex);
 151
 152         if (isOffline())
 153         {
 154             setStateFromFile(filename);
 155         }
 156         else
 157         {
 158             fNextFilename = filename;
 159             hostRequestIdle();
 160         }
 161     }
 162
 163     // -------------------------------------------------------------------
 164     // Plugin process calls
 165
 166     void process(const float* const* const inBuffer, float** const outBuffer, uint32_t frames,
 167                  const NativeMidiEvent* const midiEvents, const uint32_t midiEventCount) override
 168     {
 169         const CarlaMutexTryLocker cmtl(fProgramChangeMutex, isOffline());
 170
 171         if (cmtl.wasLocked())
 172         {
 173             process2(inBuffer, outBuffer, frames, midiEvents, midiEventCount);
 174         }
 175         else
 176         {
 177             for (uint32_t i=0; i<kNumOutputs; ++i)
 178                 carla_zeroFloats(outBuffer[i], frames);
 179         }
 180     }
 181
 182     // -------------------------------------------------------------------
 183     // Plugin dispatcher calls
 184
 185     void idle() override
 186     {
 187         if (const char* const filename = fNextFilename)
 188         {
 189             const CarlaMutexLocker cml(fProgramChangeMutex);
 190
 191             fNextFilename = nullptr;
 192             setStateFromFile(filename);
 193         }
 194     }
 195
 196 private:
 197     mutable NativeMidiProgram fRetMidiProgram;
 198     mutable String fRetMidiProgramName;
 199     const char* fNextFilename;
 200     CarlaMutex fProgramChangeMutex;
 201     const NativeMidiPrograms& kPrograms;
 202     const uint32_t kNumOutputs;
 203
 204     CARLA_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(NativePluginWithMidiPrograms)
 205 };
 206
 207 /**@}*/
 208
 209 // -----------------------------------------------------------------------
 210
 211 #endif // CARLA_NATIVE_PROGRAMS_HPP_INCLUDED