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    <p>Figured it out. Here's a simple, complete and <em>working</em> white noise generator using AudioQueue created from the Window-based Application project template.</p> <p><strong>StaticAppDelegate.h:</strong></p> <pre><code>// StaticAppDelegate.h #import &lt;UIKit/UIKit.h&gt; // STATIC ADDITIONS // Add &gt; Existing Frameworks... &gt; AudioToolbox.framework to your Target #import &lt;AudioToolbox/AudioToolbox.h&gt; // END STATIC ADDITIONS @interface StaticAppDelegate : NSObject &lt;UIApplicationDelegate&gt; { UIWindow *window; } @property (nonatomic, retain) IBOutlet UIWindow *window; // STATIC ADDITIONS - (void)startStatic; - (void)handleBufferCompleteForQueue:(AudioQueueRef)inAQ buffer:(AudioQueueBufferRef)inBuffer; // END STATIC ADDITIONS @end </code></pre> <p><strong>StaticAppDelegate.m:</strong></p> <pre><code>// StaticAppDelegate.m #import "StaticAppDelegate.h" // STATIC ADDITIONS #define kNumberBuffers 4 #define kBufferSize 2048 // AudioQueue callback void AQOutputCallback( void *inData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer ) { StaticAppDelegate *staticApp = (StaticAppDelegate *)inData; [staticApp handleBufferCompleteForQueue:inAQ buffer:inBuffer]; } // END STATIC ADDITIONS @implementation StaticAppDelegate @synthesize window; - (void)applicationDidFinishLaunching:(UIApplication *)application { // Override point for customization after application launch [window makeKeyAndVisible]; // STATIC ADDITIONS [self startStatic]; // END STATIC ADDITIONS } - (void)dealloc { [window release]; [super dealloc]; } // STATIC ADDITIONS - (void)startStatic { srandom(time(NULL)); // initiate audio session AudioSessionInitialize(NULL, NULL, NULL, NULL); UInt32 category = kAudioSessionCategory_MediaPlayback; // plays through sleep lock and silent switch AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(category), &amp;category); AudioSessionSetActive(true); // following is modified from http://stackoverflow.com/questions/1710133/playing-generated-audio-on-an-iphone // setup queue AudioQueueRef audioQueue; AudioQueueBufferRef buffers[kNumberBuffers]; AudioStreamBasicDescription format; memset(&amp;format, 0, sizeof(format)); format.mSampleRate = 44100; format.mFormatID = kAudioFormatLinearPCM; format.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked; format.mChannelsPerFrame = 1; format.mBitsPerChannel = 16; format.mBytesPerFrame = (format.mBitsPerChannel / 8) * format.mChannelsPerFrame; format.mFramesPerPacket = 1; format.mBytesPerPacket = format.mBytesPerFrame * format.mFramesPerPacket; AudioQueueNewOutput(&amp;format, AQOutputCallback, self, CFRunLoopGetCurrent(), kCFRunLoopCommonModes, 0, &amp;audioQueue); // allocate and fill the buffers for (int i = 0; i &lt; kNumberBuffers; ++i) { AudioQueueAllocateBuffer(audioQueue, kBufferSize, &amp;buffers[i]); AQOutputCallback(self, audioQueue, buffers[i]); } AudioQueueSetParameter(audioQueue, kAudioQueueParam_Volume, 1.0); AudioQueueStart(audioQueue, NULL); } - (void)handleBufferCompleteForQueue:(AudioQueueRef)inAQ buffer:(AudioQueueBufferRef)inBuffer { inBuffer-&gt;mAudioDataByteSize = inBuffer-&gt;mAudioDataBytesCapacity; int *buffer = (int *)inBuffer-&gt;mAudioData; for (int i = 0; i &lt; inBuffer-&gt;mAudioDataByteSize/sizeof(int); ++i) { buffer[i] = (int)rand(); // refill the buffer } AudioQueueEnqueueBuffer(inAQ, inBuffer, 0, NULL); } // END STATIC ADDITIONS @end </code></pre> <p>Once I figured out how to actually refill the buffer (<code>inBuffer-&gt;mAudioData</code> with some type casting) everything else fell into place.</p>
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