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<pre class="sourcecodebox">/*
File: FrequencyLevelsLayer.m
Abstract: Container that creates and handles the frequency levels
Version: 1.0
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following terms, and your use, installation, modification or
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Neither the name, trademarks, service marks or logos of Apple Inc.
may be used to endorse or promote products derived from the Apple
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as expressly stated in this notice, no other rights or licenses, express
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2007 Apple Inc. All Rights Reserved.
*/
#import "FrequencyLevels.h"
#define LEVEL_OFFSET 8
#define LEVEL_WIDTH 30
#define LEVEL_HEIGHT 240
static UInt32 numberOfBandLevels = 8; // increase this number for more frequency bands
static UInt32 numberOfChannels = 2; // for StereoMix - If using DeviceMix, you need to get the channel count of the device.
@interface FrequencyLevels (internal)
- (void)levelTimerMethod:(NSTimer*)theTimer;
@end
@implementation FrequencyLevels
//--------------------------------------------------------------------------------------------------
+ (FrequencyLevels*)levelsWithMovie:(QTMovie *)movie
{
FrequencyLevels *levels;
levels = [[FrequencyLevels alloc] init];
[levels setMovie:movie];
return [levels autorelease];
}
//--------------------------------------------------------------------------------------------------
- (id)init
{
CGImageRef freqLevelImage = nil;
self = [super init];
// allocate memory for the QTAudioFrequencyLevels struct and set it up
// depending on the number of channels and frequency bands you want
mFreqResults = malloc(offsetof(QTAudioFrequencyLevels, level[numberOfBandLevels * numberOfChannels]));
mFreqResults->numChannels = numberOfChannels;
mFreqResults->numFrequencyBands = numberOfBandLevels;
// create an array and load up the UI elements, each NSLevelIndicator has
// the appropriate tag added in IB
mFrequencyLayers = [NSMutableArray array];
[mFrequencyLayers retain];
// load image for the level indicator layers
NSURL *imageURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"penguin" ofType:@"png"]];
CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)imageURL, nil);
freqLevelImage = CGImageSourceCreateImageAtIndex(source, 0, nil);
CFRelease (source);
// create the layers
mContainer = [[CALayer layer] retain];
[mContainer setBounds:CGRectMake (0, 0, ((numberOfBandLevels * numberOfChannels) * (LEVEL_WIDTH + LEVEL_OFFSET)) + LEVEL_OFFSET, LEVEL_HEIGHT)];
int i, j;
// setup the center of the first layer
CGFloat x = LEVEL_OFFSET + (LEVEL_WIDTH * 0.5);
for(j = 0; j < numberOfChannels; j++)
{
for(i = 0; i < numberOfBandLevels; i++)
{
CALayer *levelLayer = [CALayer layer];
[levelLayer setBounds:CGRectMake (0, 0, LEVEL_WIDTH, LEVEL_HEIGHT)];
// add some shadow
levelLayer.shadowOpacity = 0.75;
// save the layer in our frequency layer's array
[mFrequencyLayers addObject:levelLayer];
// append the layer to the container's sublayers array
[mContainer addSublayer:levelLayer];
// position the layer
levelLayer.position = CGPointMake(x, 0);
// set image as the default content
levelLayer.contents = (id)freqLevelImage;
if(j > 0) // flip the right channel horizontally so the images are facing each other
levelLayer.transform = CATransform3DMakeScale(-1.0, 1.0, 1.0);
x += LEVEL_OFFSET + LEVEL_WIDTH;
}
}
return self;
}
//--------------------------------------------------------------------------------------------------
- (void)dealloc
{
// cleanup
[mContainer release];
[mFrequencyLayers release];
free(mFreqResults);
[super dealloc];
}
//--------------------------------------------------------------------------------------------------
//--------------------------------------------------------------------------------------------------
- (void)invalidate
{
if ([[mMovie attributeForKey:QTMovieHasAudioAttribute] boolValue])
{
// do this once per movie to establish metering
(void)SetMovieAudioFrequencyMeteringNumBands([mMovie quickTimeMovie], kQTAudioMeter_StereoMix, &numberOfBandLevels);
}
}
//--------------------------------------------------------------------------------------------------
- (void)setMovie:(QTMovie *)inMovie
{
mMovie = inMovie;
if (mMovie)
{
[self invalidate];
[mContainer setNeedsDisplay];
}
}
//--------------------------------------------------------------------------------------------------
- (CALayer*)layer
{
return mContainer;
}
//--------------------------------------------------------------------------------------------------
// called when the button is pressed - turns the level meters on/off by setting up a timer
- (void)toggleFreqLevels:(NSCellStateValue)state
{
if (NSOnState == state)
{
// turning it on, set up a timer and add it to the run loop
mTimer = [NSTimer timerWithTimeInterval:1.0/15 target:self selector:@selector(levelTimerMethod:) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:mTimer forMode:(NSString *)kCFRunLoopCommonModes];
mContainer.hidden = NO;
}
else
{
// turning it off, stop the timer and hide the level layers
[mTimer invalidate];
mContainer.hidden = YES;
}
}
//--------------------------------------------------------------------------------------------------
- (void)levelTimerMethod:(NSTimer*)theTimer
{
UInt8 i, j;
NSEnumerator *enumerator = [mFrequencyLayers objectEnumerator]; // get a enumerator for the array of NSLevelIndicator objects
// get the levels from the movie
OSStatus err = GetMovieAudioFrequencyLevels([mMovie quickTimeMovie], kQTAudioMeter_StereoMix, mFreqResults);
if (!err)
{
// iterate though the frequency level array and though the UI elements getting
// and setting the levels appropriately
for (i = 0; i < mFreqResults->numChannels; i++)
{
for (j = 0; j < mFreqResults->numFrequencyBands; j++)
{
// the frequency levels are Float32 values between 0. and 1.
Float32 value = (mFreqResults->level[(i * mFreqResults->numFrequencyBands) + j]) * LEVEL_HEIGHT;
CALayer *layer = [enumerator nextObject];
layer.bounds = CGRectMake(0, 0, LEVEL_WIDTH, value);
}
}
}
}
@end
</pre>
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