New class: AudioThumbnailBase, which is an abstract base class for thumbnails.

extras/JuceDemo/Builds/MacOSX/Juce Demo.xcodeproj/project.pbxproj

@@ -777,6 +777,7 @@
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@@ -848,7 +849,7 @@
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extras/JuceDemo/Builds/VisualStudio2005/Juce Demo.vcproj

@@ -1054,6 +1054,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.cpp">
             <FileConfiguration Name="Debug|Win32"
                                ExcludedFromBuild="true">

extras/JuceDemo/Builds/VisualStudio2008/Juce Demo.vcproj

@@ -1054,6 +1054,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.cpp">
             <FileConfiguration Name="Debug|Win32"
                                ExcludedFromBuild="true">

extras/JuceDemo/Builds/VisualStudio2010/Juce Demo.vcxproj

@@ -1279,6 +1279,7 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_processors\juce_audio_processors.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioDeviceSelectorComponent.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h"/>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_MidiKeyboardComponent.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\players\juce_AudioProcessorPlayer.h"/>

extras/JuceDemo/Builds/VisualStudio2010/Juce Demo.vcxproj.filters

@@ -1830,6 +1830,9 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h">
       <Filter>Juce Modules\juce_audio_utils\gui</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h">
+      <Filter>Juce Modules\juce_audio_utils\gui</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.h">
       <Filter>Juce Modules\juce_audio_utils\gui</Filter>
     </ClInclude>

extras/JuceDemo/Builds/iOS/Juce Demo.xcodeproj/project.pbxproj

@@ -769,6 +769,7 @@
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extras/audio plugin demo/Builds/MacOSX/JuceDemoPlugin.xcodeproj/project.pbxproj

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@@ -535,7 +536,6 @@
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-		B2B54E113A80EC53D5D71A38 = { isa = PBXFileReference; lastKnownFileType = file; name = "juce_module_info"; path = "../../../../modules/juce_gui_basics/juce_module_info"; sourceTree = "SOURCE_ROOT"; };
+		B1426528BB892D5736D80404 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_RelativeParallelogram.h"; path = "../../../../modules/juce_gui_basics/positioning/juce_RelativeParallelogram.h"; sourceTree = "SOURCE_ROOT"; };
+		B2067C8614967BECF8B198D1 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; name = "juce_gui_extra.mm"; path = "../../../../modules/juce_gui_extra/juce_gui_extra.mm"; sourceTree = "SOURCE_ROOT"; };
 		B318D50696B303889BDCF072 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = AUMIDIEffectBase.h; path = Extras/CoreAudio/AudioUnits/AUPublic/OtherBases/AUMIDIEffectBase.h; sourceTree = "DEVELOPER_DIR"; };
-		B532D9954FB106B6095AE0C8 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_FilenameComponent.h"; path = "../../../../modules/juce_gui_basics/filebrowser/juce_FilenameComponent.h"; sourceTree = "SOURCE_ROOT"; };
-		B5406E636D4CF8285721DCF3 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_win32_ActiveXComponent.cpp"; path = "../../../../modules/juce_gui_extra/native/juce_win32_ActiveXComponent.cpp"; sourceTree = "SOURCE_ROOT"; };
+		B34E109560D77640B7648C4D = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_ScopedWriteLock.h"; path = "../../../../modules/juce_core/threads/juce_ScopedWriteLock.h"; sourceTree = "SOURCE_ROOT"; };
+		B57C430D154C1C86350F246A = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_CustomTypeface.cpp"; path = "../../../../modules/juce_graphics/fonts/juce_CustomTypeface.cpp"; sourceTree = "SOURCE_ROOT"; };
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+		B829B4BAE71C6F09169542B8 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; name = "juce_core.mm"; path = "../../../../modules/juce_core/juce_core.mm"; sourceTree = "SOURCE_ROOT"; };
+		B8B25605AB1A04A8AE545227 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_ImageCache.h"; path = "../../../../modules/juce_graphics/images/juce_ImageCache.h"; sourceTree = "SOURCE_ROOT"; };
+		B9BDF0A1E699EA2D3549664E = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_ThreadLocalValue.h"; path = "../../../../modules/juce_core/threads/juce_ThreadLocalValue.h"; sourceTree = "SOURCE_ROOT"; };
+		B9BE6469604B9D3252EFA7E7 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_AttributedString.h"; path = "../../../../modules/juce_graphics/fonts/juce_AttributedString.h"; sourceTree = "SOURCE_ROOT"; };
+		BAF34E1248A8D20DDA992AFD = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_ComponentDragger.cpp"; path = "../../../../modules/juce_gui_basics/mouse/juce_ComponentDragger.cpp"; sourceTree = "SOURCE_ROOT"; };
 		BB84A0B296CFBF17FAF145B0 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_TemporaryFile.h"; path = "../../../../modules/juce_core/files/juce_TemporaryFile.h"; sourceTree = "SOURCE_ROOT"; };
 		BBBE74C4A9FA85B5F29FF346 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_ButtonPropertyComponent.cpp"; path = "../../../../modules/juce_gui_basics/properties/juce_ButtonPropertyComponent.cpp"; sourceTree = "SOURCE_ROOT"; };
 		BBECA9EB9DD3C9B6CB04B10A = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_Uuid.h"; path = "../../../../modules/juce_core/misc/juce_Uuid.h"; sourceTree = "SOURCE_ROOT"; };
 		BBF88983012D33EFEF11EA81 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_win32_Network.cpp"; path = "../../../../modules/juce_core/native/juce_win32_Network.cpp"; sourceTree = "SOURCE_ROOT"; };
+		BC369095BAEED8707D12F63B = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = CAStreamBasicDescription.cpp; path = Extras/CoreAudio/PublicUtility/CAStreamBasicDescription.cpp; sourceTree = "DEVELOPER_DIR"; };
 		BCB54D2E4C0C3357DACFD29B = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_NSViewComponent.h"; path = "../../../../modules/juce_gui_extra/embedding/juce_NSViewComponent.h"; sourceTree = "SOURCE_ROOT"; };
 		BD1EC91E61ECEAB657C78D5C = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_Toolbar.cpp"; path = "../../../../modules/juce_gui_basics/widgets/juce_Toolbar.cpp"; sourceTree = "SOURCE_ROOT"; };
-		BDB897B2503C29D7ABDDB656 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_AudioThumbnailCache.cpp"; path = "../../../../modules/juce_audio_utils/gui/juce_AudioThumbnailCache.cpp"; sourceTree = "SOURCE_ROOT"; };
 		BE840C441E0B5AA5C8B2AB1E = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; name = "juce_mac_Strings.mm"; path = "../../../../modules/juce_core/native/juce_mac_Strings.mm"; sourceTree = "SOURCE_ROOT"; };
 		BF0AB490EC0556BE60CDA25A = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_android_JNIHelpers.h"; path = "../../../../modules/juce_core/native/juce_android_JNIHelpers.h"; sourceTree = "SOURCE_ROOT"; };
 		BF7B980A66A9E256863EEF9D = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_ListBox.h"; path = "../../../../modules/juce_gui_basics/widgets/juce_ListBox.h"; sourceTree = "SOURCE_ROOT"; };
@@ -1122,6 +1123,7 @@
 				AB87317D90A518C8A886EE9D,
 				0B23FB9FC547A7877DC3E23E,
 				AC5452F5122E3A4B670B5185,
+				2A073A793701BE742D5D8CA9,
 				BDB897B2503C29D7ABDDB656,
 				2EA6226412D63CF270F97C8F,
 				04555664F9106966CC7A7C16,

extras/audio plugin demo/Builds/VisualStudio2005/JuceDemoPlugin.vcproj

@@ -1003,6 +1003,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.cpp">
             <FileConfiguration Name="Debug|Win32"
                                ExcludedFromBuild="true">

extras/audio plugin demo/Builds/VisualStudio2008/JuceDemoPlugin.vcproj

@@ -1003,6 +1003,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.cpp">
             <FileConfiguration Name="Debug|Win32"
                                ExcludedFromBuild="true">

extras/audio plugin host/Builds/MacOSX/Plugin Host.xcodeproj/project.pbxproj

@@ -622,6 +622,7 @@
 		B275A29B2147F6A8ADF16084 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_PropertySet.h"; path = "../../../../modules/juce_core/containers/juce_PropertySet.h"; sourceTree = "SOURCE_ROOT"; };
 		B27CEFF5B55B38F2BEB141D1 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_Atomic.h"; path = "../../../../modules/juce_core/memory/juce_Atomic.h"; sourceTree = "SOURCE_ROOT"; };
 		B2976F6A6BFA0C881FDF4B79 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_RelativePoint.cpp"; path = "../../../../modules/juce_gui_basics/positioning/juce_RelativePoint.cpp"; sourceTree = "SOURCE_ROOT"; };
+		B2F4B4B90BCD9157597A66CC = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_AudioThumbnailBase.h"; path = "../../../../modules/juce_audio_utils/gui/juce_AudioThumbnailBase.h"; sourceTree = "SOURCE_ROOT"; };
 		B3B91E79E9BE863EFB7B2B70 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_ComboBox.cpp"; path = "../../../../modules/juce_gui_basics/widgets/juce_ComboBox.cpp"; sourceTree = "SOURCE_ROOT"; };
 		B3E0F684EFAAB3722FC50D6F = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_MissingGLDefinitions.h"; path = "../../../../modules/juce_opengl/native/juce_MissingGLDefinitions.h"; sourceTree = "SOURCE_ROOT"; };
 		B454943748D0748AAF53A06F = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_Expression.cpp"; path = "../../../../modules/juce_core/maths/juce_Expression.cpp"; sourceTree = "SOURCE_ROOT"; };
@@ -1074,6 +1075,7 @@
 				0511AF7660ABC3E031579CCC,
 				6467FD9F05820570B157B623,
 				8EF26866DA3017EA400C752C,
+				B2F4B4B90BCD9157597A66CC,
 				31AC0781EAF09276F92E0DA1,
 				F2D4C223196F414CB2F93163,
 				CAEA69EBB9B2A4C60A991E80,

extras/audio plugin host/Builds/VisualStudio2005/Plugin Host.vcproj

@@ -977,6 +977,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.cpp">
             <FileConfiguration Name="Debug|Win32"
                                ExcludedFromBuild="true">

extras/audio plugin host/Builds/VisualStudio2008/Plugin Host.vcproj

@@ -977,6 +977,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.cpp">
             <FileConfiguration Name="Debug|Win32"
                                ExcludedFromBuild="true">

extras/static library/Builds/VisualStudio2008/juce.vcproj

@@ -939,6 +939,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.cpp">
             <FileConfiguration Name="Debug|Win32"
                                ExcludedFromBuild="true">

extras/static library/Builds/VisualStudio2010/juce.vcxproj

@@ -1247,6 +1247,7 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_processors\juce_audio_processors.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioDeviceSelectorComponent.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h"/>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_MidiKeyboardComponent.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\players\juce_AudioProcessorPlayer.h"/>

extras/static library/Builds/VisualStudio2010/juce.vcxproj.filters

@@ -1713,6 +1713,9 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnail.h">
       <Filter>Juce Modules\juce_audio_utils\gui</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailBase.h">
+      <Filter>Juce Modules\juce_audio_utils\gui</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\modules\juce_audio_utils\gui\juce_AudioThumbnailCache.h">
       <Filter>Juce Modules\juce_audio_utils\gui</Filter>
     </ClInclude>

modules/juce_audio_utils/gui/juce_AudioThumbnail.h

@@ -46,10 +46,9 @@ class AudioThumbnailCache;
     The thumbnail stores an internal low-res version of the wave data, and this can
     be loaded and saved to avoid having to scan the file again.
 
-    @see AudioThumbnailCache
+    @see AudioThumbnailCache, AudioThumbnailBase
 */
-class JUCE_API  AudioThumbnail    : public ChangeBroadcaster,
-                                    public AudioFormatWriter::ThreadedWriter::IncomingDataReceiver
+class JUCE_API  AudioThumbnail    : public AudioThumbnailBase
 {
 public:
     //==============================================================================

modules/juce_audio_utils/gui/juce_AudioThumbnailBase.h

@@ -0,0 +1,156 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library - "Jules' Utility Class Extensions"
+   Copyright 2004-11 by Raw Material Software Ltd.
+
+  ------------------------------------------------------------------------------
+
+   JUCE can be redistributed and/or modified under the terms of the GNU General
+   Public License (Version 2), as published by the Free Software Foundation.
+   A copy of the license is included in the JUCE distribution, or can be found
+   online at www.gnu.org/licenses.
+
+   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  ------------------------------------------------------------------------------
+
+   To release a closed-source product which uses JUCE, commercial licenses are
+   available: visit www.rawmaterialsoftware.com/juce for more information.
+
+  ==============================================================================
+*/
+
+#ifndef __JUCE_AUDIOTHUMBNAILBASE_JUCEHEADER__
+#define __JUCE_AUDIOTHUMBNAILBASE_JUCEHEADER__
+
+class AudioThumbnailCache;
+
+//==============================================================================
+/**
+    Provides a base for classes that can store and draw scaled views of an
+    audio waveform.
+
+    Typically, you'll want to use the derived class AudioThumbnail, which provides
+    a concrete implementation.
+
+    @see AudioThumbnail, AudioThumbnailCache
+*/
+class JUCE_API  AudioThumbnailBase    : public ChangeBroadcaster,
+                                        public AudioFormatWriter::ThreadedWriter::IncomingDataReceiver
+{
+public:
+    //==============================================================================
+    AudioThumbnailBase() {}
+    virtual ~AudioThumbnailBase() {}
+
+    //==============================================================================
+    /** Clears and resets the thumbnail. */
+    virtual void clear() = 0;
+
+    /** Specifies the file or stream that contains the audio file.
+
+        For a file, just call
+        @code
+        setSource (new FileInputSource (file))
+        @endcode
+
+        You can pass a zero in here to clear the thumbnail.
+        The source that is passed in will be deleted by this object when it is no longer needed.
+        @returns true if the source could be opened as a valid audio file, false if this failed for
+        some reason.
+    */
+    virtual bool setSource (InputSource* newSource) = 0;
+
+    /** Gives the thumbnail an AudioFormatReader to use directly.
+        This will start parsing the audio in a background thread (unless the hash code
+        can be looked-up successfully in the thumbnail cache). Note that the reader
+        object will be held by the thumbnail and deleted later when no longer needed.
+        The thumbnail will actually keep hold of this reader until you clear the thumbnail
+        or change the input source, so the file will be held open for all this time. If
+        you don't want the thumbnail to keep a file handle open continuously, you
+        should use the setSource() method instead, which will only open the file when
+        it needs to.
+    */
+    virtual void setReader (AudioFormatReader* newReader, int64 hashCode) = 0;
+
+    //==============================================================================
+    /** Reloads the low res thumbnail data from an input stream.
+
+        This is not an audio file stream! It takes a stream of thumbnail data that would
+        previously have been created by the saveTo() method.
+        @see saveTo
+    */
+    virtual void loadFrom (InputStream& input) = 0;
+
+    /** Saves the low res thumbnail data to an output stream.
+
+        The data that is written can later be reloaded using loadFrom().
+        @see loadFrom
+    */
+    virtual void saveTo (OutputStream& output) const = 0;
+
+    //==============================================================================
+    /** Returns the number of channels in the file. */
+    virtual int getNumChannels() const noexcept = 0;
+
+    /** Returns the length of the audio file, in seconds. */
+    virtual double getTotalLength() const noexcept = 0;
+
+    /** Draws the waveform for a channel.
+
+        The waveform will be drawn within  the specified rectangle, where startTime
+        and endTime specify the times within the audio file that should be positioned
+        at the left and right edges of the rectangle.
+
+        The waveform will be scaled vertically so that a full-volume sample will fill
+        the rectangle vertically, but you can also specify an extra vertical scale factor
+        with the verticalZoomFactor parameter.
+    */
+    virtual void drawChannel (Graphics& g,
+                              const Rectangle<int>& area,
+                              double startTimeSeconds,
+                              double endTimeSeconds,
+                              int channelNum,
+                              float verticalZoomFactor) = 0;
+
+    /** Draws the waveforms for all channels in the thumbnail.
+
+        This will call drawChannel() to render each of the thumbnail's channels, stacked
+        above each other within the specified area.
+
+        @see drawChannel
+    */
+    virtual void drawChannels (Graphics& g,
+                               const Rectangle<int>& area,
+                               double startTimeSeconds,
+                               double endTimeSeconds,
+                               float verticalZoomFactor) = 0;
+
+    /** Returns true if the low res preview is fully generated. */
+    virtual bool isFullyLoaded() const noexcept = 0;
+
+    /** Returns the number of samples that have been set in the thumbnail. */
+    virtual int64 getNumSamplesFinished() const noexcept = 0;
+
+    /** Returns the highest level in the thumbnail.
+        Note that because the thumb only stores low-resolution data, this isn't
+        an accurate representation of the highest value, it's only a rough approximation.
+    */
+    virtual float getApproximatePeak() const = 0;
+
+    /** Reads the approximate min and max levels from a section of the thumbnail.
+        The lowest and highest samples are returned in minValue and maxValue, but obviously
+        because the thumb only stores low-resolution data, these numbers will only be a rough
+        approximation of the true values.
+    */
+    virtual void getApproximateMinMax (double startTime, double endTime, int channelIndex,
+                                       float& minValue, float& maxValue) const noexcept = 0;
+
+    /** Returns the hash code that was set by setSource() or setReader(). */
+    virtual int64 getHashCode() const = 0;
+};
+
+#endif

modules/juce_audio_utils/gui/juce_AudioThumbnailCache.cpp

@@ -96,7 +96,7 @@ int AudioThumbnailCache::findOldestThumb() const
     return oldest;
 }
 
-bool AudioThumbnailCache::loadThumb (AudioThumbnail& thumb, const int64 hashCode)
+bool AudioThumbnailCache::loadThumb (AudioThumbnailBase& thumb, const int64 hashCode)
 {
     const ScopedLock sl (lock);
     ThumbnailCacheEntry* te = findThumbFor (hashCode);
@@ -113,7 +113,7 @@ bool AudioThumbnailCache::loadThumb (AudioThumbnail& thumb, const int64 hashCode
     return false;
 }
 
-void AudioThumbnailCache::storeThumb (const AudioThumbnail& thumb,
+void AudioThumbnailCache::storeThumb (const AudioThumbnailBase& thumb,
                                       const int64 hashCode)
 {
     const ScopedLock sl (lock);

modules/juce_audio_utils/gui/juce_AudioThumbnailCache.h

@@ -26,7 +26,7 @@
 #ifndef __JUCE_AUDIOTHUMBNAILCACHE_JUCEHEADER__
 #define __JUCE_AUDIOTHUMBNAILCACHE_JUCEHEADER__
 
-#include "juce_AudioThumbnail.h"
+#include "juce_AudioThumbnailBase.h"
 
 
 //==============================================================================
@@ -64,14 +64,14 @@ public:
         This is called automatically by the AudioThumbnail class, so you shouldn't
         normally need to call it directly.
     */
-    bool loadThumb (AudioThumbnail& thumb, int64 hashCode);
+    bool loadThumb (AudioThumbnailBase& thumb, int64 hashCode);
 
     /** Stores the cachable data from the specified thumb in this cache.
 
         This is called automatically by the AudioThumbnail class, so you shouldn't
         normally need to call it directly.
     */
-    void storeThumb (const AudioThumbnail& thumb, int64 hashCode);
+    void storeThumb (const AudioThumbnailBase& thumb, int64 hashCode);
 
     //==============================================================================
     /** Attempts to re-load a saved cache of thumbnails from a stream.

modules/juce_audio_utils/juce_audio_utils.h

@@ -35,10 +35,12 @@
 namespace juce
 {
 
-// START_AUTOINCLUDE gui, players
 #ifndef __JUCE_AUDIODEVICESELECTORCOMPONENT_JUCEHEADER__
  #include "gui/juce_AudioDeviceSelectorComponent.h"
 #endif
+#ifndef __JUCE_AUDIOTHUMBNAILBASE_JUCEHEADER__
+ #include "gui/juce_AudioThumbnailBase.h"
+#endif
 #ifndef __JUCE_AUDIOTHUMBNAIL_JUCEHEADER__
  #include "gui/juce_AudioThumbnail.h"
 #endif
@@ -51,7 +53,6 @@ namespace juce
 #ifndef __JUCE_AUDIOPROCESSORPLAYER_JUCEHEADER__
  #include "players/juce_AudioProcessorPlayer.h"
 #endif
-// END_AUTOINCLUDE
 
 }