Added IPcmVisualizer, ISpectrumVisualizer and a very simple facade to

access them called Visualizer.

Tweaked Player.cpp to use Visualizer and pump audio data to the selected
plugin if one is available.

src/core/audio/Player.cpp

@@ -36,6 +36,7 @@
 
 #include <core/debug.h>
 #include <core/audio/Player.h>
+#include <core/audio/Visualizer.h>
 #include <core/plugin/PluginFactory.h>
 #include <algorithm>
 
@@ -47,7 +48,6 @@ using std::min;
 using std::max;
 
 static std::string TAG = "Player";
-static float fft[FFT_N];
 
 PlayerPtr Player::Create(const std::string &url, OutputPtr output) {
     return PlayerPtr(new Player(url, output));
@@ -77,6 +77,8 @@ Player::Player(const std::string &url, OutputPtr output)
 , setPosition(-1) {
     musik::debug::info(TAG, "new instance created");
 
+    this->spectrum = new float[FFT_N];
+
     /* we allow callers to specify an output device; but if they don't,
     we will create and manage our own. */
     if (!this->output) {
@@ -96,6 +98,9 @@ Player::~Player() {
     }
 
     this->thread->join();
+
+    delete[] this->spectrum;
+    this->spectrum = nullptr;
 }
 
 void Player::Play() {
@@ -306,7 +311,13 @@ void Player::OnBufferProcessed(IBuffer *buffer) {
     bool started = false;
     bool found = false;
 
-    buffer->Fft(fft, FFT_N);
+    if (vis::SpectrumVisualizer()) {
+        buffer->Fft(this->spectrum, FFT_N);
+        vis::SpectrumVisualizer()->Write(this->spectrum, FFT_N);
+    }
+    else if (vis::PcmVisualizer()) {
+        vis::PcmVisualizer()->Write(buffer);
+    }
 
     {
         boost::mutex::scoped_lock lock(this->queueMutex);

src/core/audio/Player.h

@@ -119,6 +119,7 @@ namespace musik { namespace core { namespace audio {
             double setPosition;
             int state;
             bool notifiedStarted;
+            float* spectrum;
     };
 
 } } }

src/core/audio/Visualizer.cpp

@@ -0,0 +1,97 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2007-2016 musikcube team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright
+//      notice, this list of conditions and the following disclaimer in the
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may
+//      be used to endorse or promote products derived from this software
+//      without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include "pch.hpp"
+#include "Visualizer.h"
+#include <core/plugin/PluginFactory.h>
+
+#include <atomic>
+
+using namespace musik::core::audio;
+
+static std::vector<std::shared_ptr<ISpectrumVisualizer> > spectrumVisualizers;
+static std::vector<std::shared_ptr<IPcmVisualizer> > pcmVisualizers;
+static std::atomic<bool> initialized;
+
+namespace musik {
+    namespace core {
+        namespace audio {
+            namespace vis {
+                static void init() {
+                    {
+                        typedef PluginFactory::DestroyDeleter<ISpectrumVisualizer> Deleter;
+
+                        spectrumVisualizers = PluginFactory::Instance()
+                            .QueryInterface<ISpectrumVisualizer, Deleter>("GetSpectrumVisualizer");
+                    }
+
+                    {
+                        typedef PluginFactory::DestroyDeleter<IPcmVisualizer> Deleter;
+
+                        pcmVisualizers = PluginFactory::Instance()
+                            .QueryInterface<IPcmVisualizer, Deleter>("GetPcmVisualizer");
+                    }
+
+                    initialized = true;
+                }
+
+                ISpectrumVisualizer* SpectrumVisualizer() {
+                    if (!initialized) {
+                        init();
+                    }
+
+                    if (spectrumVisualizers.size()) {
+                        return spectrumVisualizers[0].get();
+                    }
+
+                    return nullptr;
+                }
+
+                IPcmVisualizer* PcmVisualizer() {
+                    if (!initialized) {
+                        init();
+                    }
+
+                    if (pcmVisualizers.size()) {
+                        return pcmVisualizers[0].get();
+                    }
+
+                    return nullptr;
+                }
+            }
+        }
+    }
+}

src/core/audio/Visualizer.h

@@ -0,0 +1,46 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2007-2016 musikcube team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright
+//      notice, this list of conditions and the following disclaimer in the
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may
+//      be used to endorse or promote products derived from this software
+//      without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include <core/config.h>
+#include <sdk/ISpectrumVisualizer.h>
+#include <sdk/IPcmVisualizer.h>
+
+namespace musik { namespace core { namespace audio { namespace vis {
+
+    ISpectrumVisualizer* SpectrumVisualizer();
+    IPcmVisualizer* PcmVisualizer();
+
+} } } }

src/core/core.vcxproj

@@ -85,6 +85,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="audio\GaplessTransport.cpp" />
+    <ClCompile Include="audio\Visualizer.cpp" />
     <ClCompile Include="debug.cpp" />
     <ClCompile Include="io\DataStreamFactory.cpp" />
     <ClCompile Include="io\LocalFileStream.cpp" />
@@ -116,6 +117,7 @@
   <ItemGroup>
     <ClInclude Include="audio\GaplessTransport.h" />
     <ClInclude Include="audio\ITransport.h" />
+    <ClInclude Include="audio\Visualizer.h" />
     <ClInclude Include="debug.h" />
     <ClInclude Include="io\DataStreamFactory.h" />
     <ClInclude Include="io\LocalFileStream.h" />
@@ -145,6 +147,7 @@
     <ClInclude Include="sdk\IMetadataReader.h" />
     <ClInclude Include="sdk\IOutput.h" />
     <ClInclude Include="sdk\IBufferProvider.h" />
+    <ClInclude Include="sdk\IPcmVisualizer.h" />
     <ClInclude Include="sdk\IPlugin.h" />
     <ClInclude Include="sdk\IMetadataWriter.h" />
     <ClInclude Include="db\Connection.h" />
@@ -154,6 +157,7 @@
     <ClInclude Include="audio\Buffer.h" />
     <ClInclude Include="audio\Player.h" />
     <ClInclude Include="audio\Stream.h" />
+    <ClInclude Include="sdk\ISpectrumVisualizer.h" />
     <ClInclude Include="support\Common.h" />
     <ClInclude Include="support\NonLibraryTrackHelper.h" />
     <ClInclude Include="support\PreferenceKeys.h" />

src/core/core.vcxproj.filters

@@ -112,6 +112,9 @@
     <ClCompile Include="support\PreferenceKeys.cpp">
       <Filter>src\support</Filter>
     </ClCompile>
+    <ClCompile Include="audio\Visualizer.cpp">
+      <Filter>src\audio</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="pch.hpp">
@@ -249,5 +252,14 @@
     <ClInclude Include="support\PreferenceKeys.h">
       <Filter>src\support</Filter>
     </ClInclude>
+    <ClInclude Include="sdk\IPcmVisualizer.h">
+      <Filter>src\sdk</Filter>
+    </ClInclude>
+    <ClInclude Include="sdk\ISpectrumVisualizer.h">
+      <Filter>src\sdk</Filter>
+    </ClInclude>
+    <ClInclude Include="audio\Visualizer.h">
+      <Filter>src\audio</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>

src/core/sdk/IPcmVisualizer.h

@@ -0,0 +1,48 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2007-2016 musikcube team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright
+//      notice, this list of conditions and the following disclaimer in the
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may
+//      be used to endorse or promote products derived from this software
+//      without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include "IBuffer.h"
+
+namespace musik { namespace core { namespace audio {
+
+    class IPcmVisualizer {
+        public:
+            virtual void Destroy() = 0;
+            virtual void Write(musik::core::audio::IBuffer *target) = 0;
+    };
+
+} } }
+

src/core/sdk/ISpectrumVisualizer.h

@@ -0,0 +1,50 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2007-2016 musikcube team
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//    * Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+//
+//    * Redistributions in binary form must reproduce the above copyright
+//      notice, this list of conditions and the following disclaimer in the
+//      documentation and/or other materials provided with the distribution.
+//
+//    * Neither the name of the author nor the names of other contributors may
+//      be used to endorse or promote products derived from this software
+//      without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include "config.h"
+#include "IMetadataWriter.h"
+#include "IBuffer.h"
+
+namespace musik { namespace core { namespace audio {
+
+    class ISpectrumVisualizer {
+    public:
+        virtual void Destroy() = 0;
+        virtual bool Write(float *spectrum, int size) = 0;
+    };
+
+} } }
+