Added pitch shifting to play example

mark2b · May 5, 2014 · ddadfc5 · ddadfc5
1 parent afcfa79
commit ddadfc5
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Showing 3 changed files with 38 additions and 5 deletions.
diff --git a/EZAudioExamples/OSX/EZAudioPlayFileExample/EZAudioPlayFileExample/PlayFileViewController.h b/EZAudioExamples/OSX/EZAudioPlayFileExample/EZAudioPlayFileExample/PlayFileViewController.h
@@ -60,12 +60,22 @@
  */
 @property (nonatomic,weak) IBOutlet NSSlider *framePositionSlider;
 
+/**
+ A slider to adjust the sample rate.
+ */
+@property (nonatomic,weak) IBOutlet NSSlider *sampleRateSlider;
+
 /**
  A BOOL indicating whether or not we've reached the end of the file
  */
 @property (nonatomic,assign) BOOL eof;
 
 #pragma mark - Actions
+/**
+ Changes the sampling frequency on the output unit
+ */
+-(IBAction)changeOutputSamplingFrequency:(id)sender;
+
 /**
  Switches the plot drawing type between a buffer plot (visualizes the current stream of audio data from the update function) or a rolling plot (visualizes the audio data over time, this is the classic waveform look)
  */

diff --git a/EZAudioExamples/OSX/EZAudioPlayFileExample/EZAudioPlayFileExample/PlayFileViewController.m b/EZAudioExamples/OSX/EZAudioPlayFileExample/EZAudioPlayFileExample/PlayFileViewController.m
@@ -72,7 +72,7 @@ -(void)awakeFromNib {
    Customizing the audio plot's look
    */
   // Background color
-  self.audioPlot.backgroundColor = [NSColor colorWithCalibratedRed: 0.816 green: 0.349 blue: 0.255 alpha: 1];
+  self.audioPlot.backgroundColor = [NSColor colorWithCalibratedRed: 0.175 green: 0.151 blue: 0.137 alpha: 1];
   // Waveform color
   self.audioPlot.color           = [NSColor colorWithCalibratedRed: 1.000 green: 1.000 blue: 1.000 alpha: 1];
   // Plot type
@@ -104,6 +104,14 @@ -(void)changePlotType:(id)sender {
   }
 }
 
+-(void)changeOutputSamplingFrequency:(id)sender
+{
+  AudioStreamBasicDescription asbd = [EZOutput sharedOutput].audioStreamBasicDescription;
+  float samplingFrequency = ((NSSlider *)sender).floatValue;
+  asbd.mSampleRate = samplingFrequency;
+  [[EZOutput sharedOutput] setAudioStreamBasicDescription:asbd];
+}
+
 -(void)openFile:(id)sender {
   NSOpenPanel* openDlg = [NSOpenPanel openPanel];
   openDlg.canChooseFiles = YES;
@@ -176,7 +184,13 @@ -(void)openFileWithFilePathURL:(NSURL*)filePathURL {
   self.plotSegmentControl.selectedSegment = 1;
 
   // Set the client format from the EZAudioFile on the output
-  [[EZOutput sharedOutput] setAudioStreamBasicDescription:self.audioFile.clientFormat];
+
+#pragma mark Mess Around With Audio Stream Basic Description Here!
+  self.sampleRateSlider.floatValue = self.audioFile.clientFormat.mSampleRate;
+  AudioStreamBasicDescription outputASBD = self.audioFile.clientFormat;
+
+  [[EZOutput sharedOutput] setAudioStreamBasicDescription:outputASBD];
+
 
   // Plot the whole waveform
   self.audioPlot.plotType        = EZPlotTypeBuffer;

diff --git a/EZAudioExamples/OSX/EZAudioPlayFileExample/EZAudioPlayFileExample/PlayFileViewController.xib b/EZAudioExamples/OSX/EZAudioPlayFileExample/EZAudioPlayFileExample/PlayFileViewController.xib
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="4514" systemVersion="13A603" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="4514" systemVersion="13B42" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
         <deployment version="1070" identifier="macosx"/>
         <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="4514"/>
@@ -12,6 +12,7 @@
                 <outlet property="framePositionSlider" destination="CFP-v0-TzQ" id="3oy-Xn-4JK"/>
                 <outlet property="playButton" destination="OQp-Lr-dlS" id="K5R-Qg-7DY"/>
                 <outlet property="plotSegmentControl" destination="bZW-tA-C61" id="4ic-Ou-qh2"/>
+                <outlet property="sampleRateSlider" destination="rRH-oS-VV3" id="8ij-Ff-CZK"/>
                 <outlet property="view" destination="Xpo-HP-Ost" id="zlj-bW-4iz"/>
             </connections>
         </customObject>
@@ -40,8 +41,8 @@
                         <action selector="openFile:" target="-2" id="3QB-hU-LDl"/>
                     </connections>
                 </button>
-                <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" misplaced="YES" translatesAutoresizingMaskIntoConstraints="NO" id="0eT-7c-7fJ">
-                    <rect key="frame" x="141" y="235" width="321" height="17"/>
+                <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="0eT-7c-7fJ">
+                    <rect key="frame" x="141" y="235" width="38" height="17"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <textFieldCell key="cell" lineBreakMode="truncatingMiddle" sendsActionOnEndEditing="YES" title="Label" id="vXQ-HF-vLX">
                         <font key="font" metaFont="system"/>
@@ -86,6 +87,14 @@
                         <action selector="seekToFrame:" target="-2" id="iVY-so-6X2"/>
                     </connections>
                 </slider>
+                <slider verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="rRH-oS-VV3">
+                    <rect key="frame" x="141" y="199" width="96" height="21"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                    <sliderCell key="cell" state="on" alignment="left" minValue="8000" maxValue="88200" doubleValue="44100" tickMarkPosition="above" sliderType="linear" id="xbX-Ce-da5"/>
+                    <connections>
+                        <action selector="changeOutputSamplingFrequency:" target="-2" id="yWM-Ei-ztA"/>
+                    </connections>
+                </slider>
             </subviews>
             <constraints>
                 <constraint firstItem="CFP-v0-TzQ" firstAttribute="top" secondItem="OQp-Lr-dlS" secondAttribute="bottom" constant="20" id="6uf-rh-zEf"/>