/*

File: MyController.m

Author: QuickTime DTS

Change History (most recent first): <1> 11/24/05 initial release

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*/

#import "MyController.h"

static UInt32 numberOfBandLevels = 4;       // 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.

static UInt8  maxLevelIndicatorValue = 20;  // NSLevelIndicators are set up to have this max value

@implementation MyController

- (void)awakeFromNib

{

    UInt8 j;

    [mButton setEnabled:FALSE];

    // 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

    mArray = [NSMutableArray array];

    [mArray retain];

    // somewhat cheezoid, but NSLevelIndicator doesn't allow us to create a vertical control

    // so we've created two views containing our controls and we rotate them to vertical

    [mMeterView1 setFrameRotation: 90.0];

    [mMeterView2 setFrameRotation: 90.0];

    // add each set of controls to an array we can later interate through

    // one for each channel

    for (j = 0; j < mFreqResults->numFrequencyBands; j++) {

        id levelIndicator = [mMeterView1 viewWithTag:j];

        [levelIndicator setEnabled:FALSE]; // prevent values being changed by clicking on the indicators

        [mArray addObject:levelIndicator];

    }

    for (j = 0; j < mFreqResults->numFrequencyBands; j++) {

        id levelIndicator = [mMeterView2 viewWithTag:j];

        [levelIndicator setEnabled:FALSE]; // prevent values being changed by clicking on the indicators

        [mArray addObject:levelIndicator];

    }

}

#pragma mark ---- panel callbacks ----

// movie opening panel

- (void)openPanelDidEnd:(NSOpenPanel *)sheet returnCode:(int)returnCode contextInfo:(void *)contextInfo

{

    if (NSOKButton == returnCode) {

        NSString *theFilename = [[sheet filenames] objectAtIndex:0];

        [sheet close];

        [self openMovie:theFilename];

    }

}

#pragma mark ---- timer ----

// timer method to display the frequency levels in the UI

- (void)myTimerFireMethod:(NSTimer*)theTimer

{

    UInt8 i, j;

    NSEnumerator *enumerator = [mArray 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) {

        // something went wrong so turn it off

        [mWindow setTitle:[NSString stringWithFormat:@"Error %d", err]];

        [mButton setEnabled:FALSE];

        [mButton setState:NSOffState];

        [self toggleFreqLevels:self];

        return;

    }

    // 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]) * maxLevelIndicatorValue;

            [[enumerator nextObject] setFloatValue:value];

        }

    }

}

#pragma mark ---- open movie/set up metering ----

// select a file to open

- (IBAction)doOpen:(id)sender

{

    [[NSOpenPanel openPanel] beginSheetForDirectory:nil

                             file:nil

                             types:nil

                             modalForWindow:mWindow

                             modalDelegate:self

                             didEndSelector:@selector(openPanelDidEnd:returnCode:contextInfo:)

                             contextInfo:nil];

}

// called when the button is pressed - turns the level meters on/off by setting up a timer

- (IBAction)toggleFreqLevels:(id)sender

{

    if (NSOnState == [mButton 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(myTimerFireMethod:) userInfo:nil repeats:YES];

        [[NSRunLoop currentRunLoop] addTimer:mTimer forMode:(NSString *)kCFRunLoopCommonModes];

    } else {

        // turning it off invalidate the timer and make sure each level indicator is set to 0

        NSEnumerator *enumerator = [mArray objectEnumerator];

        id levelIndicator;

        [mTimer invalidate];

        while (levelIndicator = [enumerator nextObject]) {

            [levelIndicator setFloatValue:0.0];

        }

    }

}

// open the QTMovie and set it in the view replacing the movie that was there

- (void)openMovie:(NSString *)inFile

{

    NSAlert *alert = nil;

    NSError *error = nil;

    if (mMovie != nil) {

        [mMovieView pause:self];

        [mMovieView setMovie:nil];

    }

    mMovie = [QTMovie movieWithFile:inFile error:&error];

    if (nil == error) {

        [mWindow setTitle:[mMovie attributeForKey:QTMovieDisplayNameAttribute]];

        [mMovieView setMovie:mMovie];

        [mMovieView setNeedsDisplay:TRUE];

        if (TRUE == [[mMovie attributeForKey:QTMovieHasAudioAttribute] boolValue]) {

            // do this once per movie to establish metering

            OSStatus err = SetMovieAudioFrequencyMeteringNumBands([mMovie quickTimeMovie], kQTAudioMeter_StereoMix, &numberOfBandLevels);

            if (err) {

                // if something went wrong turn it off

                [mWindow setTitle:[NSString stringWithFormat:@"Error %d", err]];

                [mButton setEnabled:FALSE];

                [mButton setState:NSOffState];

                [self toggleFreqLevels:self];

            } else {

                [mButton setEnabled:TRUE];

            }

        } else {

            alert = [NSAlert alertWithMessageText:@"No Sound Track!"

                             defaultButton:@"OK"

                             alternateButton:nil

                             otherButton:nil

                             informativeTextWithFormat:@"Open some media that contains audio if you're planing to see some frequency levels."];

            [alert runModal];

        }

    } else {

        [mButton setEnabled:FALSE];

        alert = [NSAlert alertWithError:error];

        [alert runModal];

    }

}

#pragma mark ---- application delegates ----

// split when window is closed

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender

{

    return YES;

}

@end