[JAVA][Beginning Java 8 Games Development]

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Chapter 15 ■ Implementing Game Audio Assets: Using the JavaFX AudioClip Class Audio Sequencing Engine The next thing that we will do is to go back and use the File ➤ Open menu sequence to open the left.wav file that contains only the segment of digital audio data that we wish to optimize. This is seen in the middle of Figure 15-3 (the menu sequence), and on the right side of the screenshot you can see a Select one or more audio files (File Open) dialog. Notice that the left.wav file shows what its raw (original) data footprint is (113 KB). We can use this original data footprint as a baseline to see how many times we reduce the data footprint (it will eventually be 8.8 times smaller, once we are done) during this optimization process we are about to embark on. When you click on the Open button and open a file for the first time in Audacity you’ll get a Warning dialog, which is shown in Figure 15-4. This will advise you that you can make a copy of your original file for use in your editing session, instead of using the original. This is what is called “non-destructive” editing in the multimedia industry, and is always a very good idea, since it essentially provides you with a back-up file (the original), as part of the work process. Figure 15-4. Enable non-destructive audio editing in Audacity Select the “Make a copy of the files before editing (safer)” radio button option, and check the “Don’t warn again, and always use my choice above” checkbox, which will turn Audacity 2 into a non-destructive non-linear digital audio editing software package. Click on the OK button and we’ll be ready to start your digital audio data optimization work process. We will be optimizing our digital audio data, but not compressing it, and I will get into why that is next. Optimization Versus Compression: The Audio Memory Footprint You might be wondering why I am using the uncompressed, pulse code modulated (PCM) Wave (.wav) file format instead of the industry standard .MP3 file format that many of you use for your digital audio music file storage. I will cover the reason for this up front, before we start the optimization process. In digital audio, there are really two stages to data footprint optimization. First you optimize the sample resolution (32-bit original recording, 24-bit HD audio, 16-bit CD Quality audio and 8-bit lower quality audio) and the sample frequency (44.1kHz, 22.05kHz, 11.025kHz are the primary frequency levels that still maintain enough data for a quality result), and then you apply the compression. The compression affects your file size; in this case it is your .JAR (Java Resources) file. So, why are we not compressing our files into MP3 format, to make our .JAR file a few kilobytes smaller? A primary reason for this is because MP3 is a “lossy” format, which throws away original data (and quality) for the audio sample. Since the JavaFX AudioClip class is going to take our digital audio assets and decompress them into memory, if we use MP3, that memory will contain lower quality audio data that if we use WAV format. Given that we are going to get at least an 8X data footprint reduction during the sample optimization work process that we are about to learn in the next section of the chapter, and that all our digital audio assets are going to be optimized to between 4KB and 14K of data footprint, MP3 compression is not going to give us any real JAR file data footprint reduction relative to the reduction in sample quality that it will “cost” us. Game audio is short-burst sound effects and musical loops, so we can use WAV file format and still get a good result, and not have to use any compression. The other advantage is the data size of the WAV file that you see in our file management software is also the amount of memory the sample will use. www.it-ebooks.info 327
Chapter 15 ■ Implementing Game Audio Assets: Using the JavaFX AudioClip Class Audio Sequencing Engine Audio Sample Resolution and Frequency: Optimizing for Your Memory Footprint The first step in the memory data footprint reduction process will be to take the raw 32-bit data sampling rate and reduce that by 100%, from 32-bit floating point data to 16-bit PCM data, as is shown in Figure 15-5 on the bottom left of the screenshot. Find the drop-down arrow in the gray information panel on the left side of the Audacity sample editing area, which I have circled in red in this screenshot as it is kind of difficult to find if you are not used to using it. This will give you a menu that allows you to set the data display (Waveform or Spectrogram) and set your Sample Data Format, which is the submenu that we want to use to select the 16-bit PCM option rather than the 32-bit float option. Do not set your sample rate using this menu, as it will slow down your voice (you can try this if you want to use this as a special effect later on). Next, we will be looking at the correct work process for setting the sample rate. Figure 15-5. Click the drop-down menu arrow at the left and select the Set Sample Format ➤ 16-bit PCM setting option It is important to note that if you save your file out after making this data bit-level change, your file size will not have changed! As you may have noticed, the Export File dialog is saving your file in 16-bit PCM WAVE format, so it is doing this same adjustment that you are doing here in memory, for your file size on disk. I am simply including this step here so that you get a comprehensive overview of the entire process, starting with a sample data rate reduction, and then reducing the sample frequency rate, which we are going to do next, and finally addressing the stereo versus mono sample consideration, which will be our final step later on in this section of the chapter. Each of these “optimization moves” can reduce the file size (and memory footprint) by 100% or more, upon each application of the work process. In fact, when we reduce the sampling frequency next from 44,100 to 11,025 we will be reducing the data footprint by 200% (100% from 44,100 to 22,050, and then 100% from 22,050 to 11,025). 328 www.it-ebooks.info
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Contents at a Glance About the Auth
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Introduction The Java Programming L
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■ Introduction In Chapter 13 you
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Chapter 1 ■ Setting Up a Java 8 G
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Chapter 2 Setting Up Your Java 8 ID
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Chapter 2 ■ Setting Up Your Java
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Profiling Your Java 8 Game Applicat
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Chapter 3 ■ A Java 8 Primer: An I
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Chapter 4 ■ An Introduction to Ja
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Chapter 5 An Introduction to Game D
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Chapter 5 ■ An Introduction to Ga
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Chapter 6 The Foundation of Game De
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Chapter 6 ■ The Foundation of Gam
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Chapter 7 The Foundation of Game Pl
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Chapter 8 Creating Your Actor Engin
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Chapter 8 ■ Creating Your Actor E
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Chapter 9 Controlling Your Action F
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Chapter 9 ■ Controlling Your Acti
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Chapter 10 Directing the Cast of Ac
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Chapter 10 ■ Directing the Cast o
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Chapter 11 ■ Moving Your Action F
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Chapter 12 Setting Boundaries for Y
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Chapter 12 ■ Setting Boundaries f
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Chapter 13 ■ Animating Your Actio
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Chapter 17 Enhancing Game Play: Cre
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Chapter 17 ■ Enhancing Game Play:
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■ index Background image (cont.)
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■ index InvinciBagel animation (c
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■ index Modifier keywords access
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Beginning Java 8 Games Development
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This Java 8 Game Development book i
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■ Contents NetBeans 8.0 Is User I
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■ Contents ■■Chapter 5: An In
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■ Contents Creating a Hero Superc
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■ Contents Organizing the .update
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■ Contents Optimizing the Scene G
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About the Author Wallace Jackson ha
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Acknowledgments I would like to ack
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