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What is the Amplitude Xtra? Amplitude Xtra allows Macromedia Director movies to respond in real time to the amplitude data derived from sound cast members. Amplitude data is an accurate representation of the relative loudness of the sound over time - in other words, it represents the waveform of the sound. The xtra sends a continuous stream of amplitude values to Director while a sound is playing. This means that, amongst other things, you can, |  |
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What is the Amplitude Xtra?
Amplitude Xtra allows Macromedia Director movies to respond in real time to the amplitude data derived from sound cast members. Amplitude data is an accurate representation of the relative loudness of the sound over time - in other words, it represents the waveform of the sound. The xtra sends a continuous stream of amplitude values to Director while a sound is playing. This means that, amongst other things, you can,
- synchronize sprite animations and properties to sounds in Director
- draw sound waveforms using normal Director sprites in real time at any resolution
- achieve lip-sync between animated characters and spoken dialogue
- change inks and blend properties in time with sound and music
- create sound visualizations based on amplitude intensity using Imaging Lingo or Shockwave 3D
The Amplitude xtra,
- works with internal sound cast members (including SWA and MP3)
- works with externally linked WAVE, AIFF, SWA and MP3 files
- works with Director 7, 8, 8.5, MX and MX2004 (including 10.1)
- is cross-platform (Windows, MacOS 8/9, MacOS X)
- is safe for use with Shockwave
- works with streaming Shockwave audio
The xtra has a number of Lingo functions for setting parameters and receiving amplitude data. There are also a number of easily configurable xtra properties, including,
- resolution - determines the number of amplitude data values per second that get sent to Director
- scale - determines the scale used for amplitude values. Can be any value between 1 and 32767
- smooth data - smoothes the data resulting in less rapid fluctuations between amplitude values which means smoother animations, etc.
The Amplitude and AmplitudePro Xtras
There are two editions of the xtra; the Amplitude Xtra and the AmplitudePro Xtra. This page deals with the standard Amplitude Xtra.
The AmplitudePro Xtra incorporates all the functionality of the standard xtra plus spectrum analysis so now you can use frequency power values derived from sound cast members in Director.
The Xtras Compared
Which xtra to use?
Use the Amplitude Xtra if you want to:
- do animations in synch with the loudness (amplitude) of sound or music.
- lip-sync animated characters to spoken dialog
- draw sound waveforms
Use the AmplitudePro Xtra if you want to:
- do anything you can do with the Amplitude Xtra, plus...
- create frequency-based visualizations of sounds using normal Director sprites, imaging Lingo or Shockwave 3D.
- synchronize animations to frequency values.
- create graphical EQ displays.
The following table lists the features available in each xtra.
What's new in version 3
- compatibility with Director 11 and Shockwave 11
- a Universal Binary version of the Macintosh xtra that runs natively on Intel and PPC Macs
- compatibility with Windows Vista
- backwards compatibilty with Director 8 - 10.x on both Windows and Macintosh platforms
- enhanced control of amplitude smoothing
- support for sound members using 48KHz sample rate
- support for MP3 files using Variable Bit Rate (VBR) and Joint-Stereo encoding
Bug fixes include:
- invalid data output and occasional crashing when processing unsupported compressed WAVE files.
- incorrect data to be generated when the sound file has many cuepoints
- amplitude dB scale returning -1 for silence in some sound files
- normalize bug resulting in negative values when processing some linked sound files
- invalid data being generated with the resolution property = 1
This version of the Amplitude Xtra also marks the end of the Macintosh Classic (OS8-9) xtra. A MacOS X Carbon-only version of the xtra is included in the v3.0 package for backwards compatibility with Director/Shockwave 10 and earlier.
Process amplitude data
Yes
Yes
Process spectrum data
No
Yes
Normalize sound data
Yes
Yes
Mono/Stereo sound processing
Yes
Yes
dB scaling of amplitude data
Yes
Yes
Smoothing of amplitude data
Yes
Yes
Streaming audio support
Yes
Yes
Shockwave safe
Yes
Yes