Farnell PDF VisualAudio Designer User's Guide - Analog Devices - Analog Devices

VisualAudio Designer User's Guide - Analog Devices - Analog Devices - Revenir à l'accueil

 

 

Branding Farnell element14 (France)

 

Farnell Element 14 :

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Everything You Need To Know About Arduino

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Tutorial 01 for Arduino: Getting Acquainted with Arduino

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The Cube® 3D Printer

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What's easier- DIY Dentistry or our new our website features?

 

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Ben Heck's Getting Started with the BeagleBone Black Trailer

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Ben Heck's Home-Brew Solder Reflow Oven 2.0 Trailer

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Get Started with Pi Episode 3 - Online with Raspberry Pi

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Discover Simulink Promo -- Exclusive element14 Webinar

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Ben Heck's TV Proximity Sensor Trailer

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Ben Heck's PlayStation 4 Teardown Trailer

See the trailer for the next exciting episode of The Ben Heck show. Check back on Friday to be among the first to see the exclusive full show on element…

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Get Started with Pi Episode 4 - Your First Raspberry Pi Project

Connect your Raspberry Pi to a breadboard, download some code and create a push-button audio play project.

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Ben Heck Anti-Pickpocket Wallet Trailer

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Molex Earphones - The 14 Holiday Products of Newark element14 Promotion

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Tripp Lite Surge Protector - The 14 Holiday Products of Newark element14 Promotion

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Microchip ChipKIT Pi - The 14 Holiday Products of Newark element14 Promotion

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Beagle Bone Black - The 14 Holiday Products of Newark element14 Promotion

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3M E26, LED Lamps - The 14 Holiday Products of Newark element14 Promotion

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3M Colored Duct Tape - The 14 Holiday Products of Newark element14 Promotion

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Tenma Soldering Station - The 14 Holiday Products of Newark element14 Promotion

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Duratool Screwdriver Kit - The 14 Holiday Products of Newark element14 Promotion

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Cubify 3D Cube - The 14 Holiday Products of Newark element14 Promotion

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Bud Boardganizer - The 14 Holiday Products of Newark element14 Promotion

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Raspberry Pi Starter Kit - The 14 Holiday Products of Newark element14 Promotion

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Fluke 323 True-rms Clamp Meter - The 14 Holiday Products of Newark element14 Promotion

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Dymo RHINO 6000 Label Printer - The 14 Holiday Products of Newark element14 Promotion

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3M LED Advanced Lights A-19 - The 14 Holiday Products of Newark element14 Promotion

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Innovative LPS Resistor Features Very High Power Dissipation

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Charge Injection Evaluation Board for DG508B Multiplexer Demo

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Ben Heck The Great Glue Gun Trailer Part 2

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Introducing element14 TV

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Ben Heck Time to Meet Your Maker Trailer

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Détecteur de composants

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Recherche intégrée

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Ben Builds an Accessibility Guitar Trailer Part 1

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Ben Builds an Accessibility Guitar - Part 2 Trailer

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PiFace Control and Display Introduction

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Flashmob Farnell

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Express Yourself in 3D with Cube 3D Printers from Newark element14

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Farnell YouTube Channel Move

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Farnell: Design with the best

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French Farnell Quest

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Altera - 3 Ways to Quickly Adapt to Changing Ethernet Protocols

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Cy-Net3 Network Module

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MC AT - Professional and Precision Series Thin Film Chip Resistors

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Solderless LED Connector

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PSA-T Series Spectrum Analyser: PSA1301T/ PSA2701T

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3-axis Universal Motion Controller For Stepper Motor Drivers: TMC429

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Voltage Level Translation

Puce électronique / Microchip :

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Microchip - 8-bit Wireless Development Kit

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Microchip - Introduction to mTouch Capacitive Touch Sensing Part 2 of 3

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Microchip - Introduction to mTouch Capacitive Touch Sensing Part 3 of 3

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Microchip - Introduction to mTouch Capacitive Touch Sensing Part 1 of 3

Sans fil - Wireless :

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Microchip - 8-bit Wireless Development Kit

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Wireless Power Solutions - Wurth Electronics, Texas Instruments, CadSoft and element14

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Analog Devices - Remote Water Quality Monitoring via a Low Power, Wireless Network

Texas instrument :

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Texas Instruments - Automotive LED Headlights

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Texas Instruments - Digital Power Solutions

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Texas Instruments - Industrial Sensor Solutions

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Texas Instruments - Wireless Pen Input Demo (Mobile World Congress)

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Texas Instruments - Industrial Automation System Components

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Texas Instruments - TMS320C66x - Industry's first 10-GHz fixed/floating point DSP

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Texas Instruments - TMS320C66x KeyStone Multicore Architecture

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Texas Instruments - Industrial Interfaces

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Texas Instruments - Concerto™ MCUs - Connectivity without compromise

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Texas Instruments - Stellaris Robot Chronos

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Texas Instruments - DRV8412-C2-KIT, Brushed DC and Stepper Motor Control Kit

Ordinateurs :

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Ask Ben Heck - Connect Raspberry Pi to Car Computer

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Ben's Portable Raspberry Pi Computer Trailer

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Ben's Raspberry Pi Portable Computer Trailer 2

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Ben Heck's Pocket Computer Trailer

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Ask Ben Heck - Atari Computer

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Ask Ben Heck - Using Computer Monitors for External Displays

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Raspberry Pi Partnership with BBC Computer Literacy Project - Answers from co-founder Eben Upton

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Installing RaspBMC on your Raspberry Pi with the Farnell element14 Accessory kit

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Raspberry Pi Served - Joey Hudy

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Happy Birthday Raspberry Pi

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Raspberry Pi board B product overview

Logiciels :

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Ask Ben Heck - Best Opensource or Free CAD Software

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Tektronix FPGAView™ software makes debugging of FPGAs faster than ever!

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Ask Ben Heck - Best Open-Source Schematic Capture and PCB Layout Software

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Introduction to Cadsoft EAGLE PCB Design Software in Chinese

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Altera - Developing Software for Embedded Systems on FPGAs

Tutoriels :

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Ben Heck The Great Glue Gun Trailer Part 1

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the knode tutorial - element14

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Ben's Autodesk 123D Tutorial Trailer

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Ben's CadSoft EAGLE Tutorial Trailer

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Ben Heck's Soldering Tutorial Trailer

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Ben Heck's AVR Dev Board tutorial

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Ben Heck's Pinball Tutorial Trailer

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Ben Heck's Interface Tutorial Trailer

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First Stage with Python and PiFace Digital

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Cypress - Getting Started with PSoC® 3 - Part 2

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Energy Harvesting Challenge

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New Features of CadSoft EAGLE v6

Autres documentations :

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www.analog.com Developing VisualAudio Modules Copyright Information © 2006 Analog Devices, Inc., ALL RIGHTS RESERVED. This document may not be reproduced in any form without prior, express written consent from Analog Devices, Inc. Printed in the USA. Disclaimer Analog Devices, Inc. reserves the right to change this product without prior notice. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use; nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under the patent rights of Analog Devices, Inc. Trademark and Service Mark Notice The Analog Devices logo, VisualDSP++, VisualAudio, SHARC, Blackfin, and EZ-KIT Lite are registered trademarks of Analog Devices, Inc. All other brand and product names are trademarks or service marks of their respective owners. 2 of 51 Contents Contents..............................................................................................................................................................................................................3 Preface.................................................................................................................................................................................................................4 Purpose of This Manual................................................................................................................................................................................4 Custom Audio Modules....................................................................................................................................................................................5 Overview.........................................................................................................................................................................................................5 Numerics on the Blackfin and SHARC.......................................................................................................................................................9 Example 1A – Mono Parametric Scaling....................................................................................................................................................9 Example 1B – Render Function in ASM.................................................................................................................................................19 Scratch Buffers............................................................................................................................................................................................22 Auxiliary Memory for Module Instances................................................................................................................................................22 Pointer Aliasing Rules................................................................................................................................................................................25 Meta-Variables and Expressions...............................................................................................................................................................26 Modifying Module Parameters.................................................................................................................................................................27 Expression Language Details.....................................................................................................................................................................28 Modules With Data of Varying Size.........................................................................................................................................................33 Modules With a Variable Number of Pins...............................................................................................................................................34 Frequency Domain Processing.................................................................................................................................................................36 Other Features of the XML File................................................................................................................................................................36 Custom Bypass Functions..........................................................................................................................................................................38 SHARC SIMD Considerations..................................................................................................................................................................38 Adjusting Modules from Other Modules................................................................................................................................................39 Dynamically Changing a Module’s Render Function............................................................................................................................39 Compatibility between Blackfin and SHARC Modules.........................................................................................................................39 Reference Section............................................................................................................................................................................................41 AudioProcessing.h Structures...................................................................................................................................................................41 Module Memory Sections.........................................................................................................................................................................44 Summary of Naming Conventions...........................................................................................................................................................45 Inspector Control Types............................................................................................................................................................................47 XML Format................................................................................................................................................................................................50 Index.................................................................................................................................................................................................................51 3 of 51 Preface PURPOSE OF THIS MANUAL The VisualAudio Designer Users’ Guide explains how to use VisualAudio to develop audio processing software for a wide variety of products. The guide describes the graphical interface, provides step-by-step procedures for completing tasks, and contains detailed technical information on how to integrate the generated code into your final product. Intended Audience The primary audience for this manual is a programmer who is familiar with Analog Devices, Inc. processors. This manual assumes that the audience can use the VisualDSP++ development environment to develop, build, and debug Digital Signal Processing (DSP) applications for the SHARC or Blackfin processor. 4 of 51 Custom Audio Modules This document explains how to write an audio processing module for VisualAudio for SHARC processors in the 26x and 36x families, as well as for Blackfin processors in the 53x and 56x families. Audio modules allow audio processing (sometimes called “post-processing”) to be implemented by making use of a number of smaller, self-contained processing blocks. The topics are organized as follows. • “Overview” • “Numerics on SHARC and Blackfin” • “Example 1A – Mono parameter scaling” • “Example 1B – Render function in ASM” • “Scratch Buffers” • “Auxiliary Memory for Module Instances” • “Pointer Aliasing Rules” • “Meta-variables and Expressions” • “Modifying Module Parameters” • “Expression Language Details” • “Modules with Data of Varying Size” • “Modules with Variable Numbers of Pins” • “Other Features of the XML File” • Custom Bypass Functions” • “SHARC SIMD Considerations” • “Adjusting Modules from Other Modules” • “Dynamically Changing a Module’s Render Function” • “Compatibility between Blackfin and SHARC Modules” OVERVIEW This section includes a brief philosophical review of what motivated certain design decisions, a discussion about the quasi-object orientation inherent in the module concept, a description of usage scenarios and a high-level description of the parts of a module. Design Philosophy The module format was designed with the following goals in mind. • Minimal run-time processor footprint • CPU efficiency • Straightforward to write and use Several key features help accomplish these goals. • VisualAudio does as much work as possible at compile and assembly time to enable the production DSP code to be lean, while still providing a flexible environment for creating and deploying modules. • Modules process a block of samples at a time to ensure that the cost of loading and storing state and parameters is incurred only once per block instead of once per sample. • VisualAudio supports interleaved stereo connections between modules to enable a common use of Single-Instruction, Multiple-Data (SIMD) on the SHARC DSP. This signal type is also supported on the Blackfin, primarily for compatibility with system designs originating on SHARCs. 5 of 51 • VisualAudio supports signals at both the audio sampling rate and a lower “control rate.” This allows slowly-changing control signals to use less memory and MIPS. • VisualAudio supports a variety of frequency domain signal types, as well as a user-settable FFT size and hop factor for “overlap-add” and “overlap-save” style processing. • Some of the spirit of object-oriented programming is borrowed, while a lean approach is maintained. Note that C++ is not used. • To keep the CPU usage (MIPS) of a module relatively constant, a module instance should perform roughly the same operations every time it runs. Assume the module’s worst case CPU usage. The exception is when there are clear modes. In this case, the user can plan in advance the combination of module modes that will be in use at a particular time. • In keeping with the goals of near-constant CPU usage and minimal memory usage, parameter calculation (such as filter design) is normally pushed forward to design time, and implemented outside the DSP runtime (for example within VisualAudio Designer). Therefore, modules usually do not contain design or initialization code on the DSP. Instead, module instances are normally initialized and designed via static initialization of their state structures (in code generated by VisualAudio Designer or by the user).1 Module Terminology Each type of processing module is represented by its own module class. These are instantiable; multiple instances of each class may exist at the same time. We use the term module when the distinction between the class and the instance is clear from context. Examples of modules include “Scaler N Smoothed” and “Delay).” The behavior of modules is adjusted via render variables. These are variables that exist on the DSP as part of the module instance structure. In addition, VisualAudio Designer presents high-level interface variables for each module. Interface variables are those exposed via module inspectors within VisualAudio Designer. An interface variable may correspond directly to a render variable. Alternatively, an interface variable may be mapped to a render variable through some function; for example, translating a delay time in milliseconds to a sample delay. Other possibilities include more complicated dependencies, where one or more interface variables touch one or more render variables. Render variables are defined in associated .h files detailing the instance structure of each module; interface variables are defined in associated .xml files. Interface variables are sometimes referred to as high-level variables, while render variables are sometimes referred to as low-level variables. There are three kinds of render variables, differing in restrictions on when they are set: • Constants are typically set only at design time (i.e. their value doesn’t usually change at run time.) • Parameters are typically set at design or tuning time from VisualAudio Designer, or by DSP control code • States can be set by the module’s render function itself, as well as by VisualAudio Designer in tuning mode or by DSP control code. Within VisualAudio Designer, these restrictions are enforced. On the DSP itself, it is up to the user to abide by these guidelines as appropriate. The term render variable is used to distinguish it from a meta-variable, which exists only in VisualAudio Designer’s representation of the module, not on the DSP. Thus, the set of interface variables contains some render variables and some meta-variables. Modules are interconnected via pins. Pins may be designated as either input or output. Either may be of type stereo_pcm, mono_pcm or control. The stereo_pcm and mono_pcm pins are collectively referred to as “audio rate pins,” or simply “audio 1 In stand-alone usage (without VisualAudio Designer) or when modules are implemented in terms of other modules, allocation can be either dynamic or static and initialization DSP code is often included. 6 of 51 pins.” Control rate pins are referred to as “control pins” and are of type control. Frequency domain pins may be of the following types: spectrum_real, spectrum_complex, spectrum_half_real and spectrum_half_complex. These are explained in more detail later. There are two kinds of modules: those that have a fixed number of pins, and those in which the number of input and/or output pins varies from instance to instance. A module class may have outputs, but no inputs, in which case it can be thought of as a signal generator (such as a sine wave generator). Or, it can have inputs, but no outputs, and report its results in a state variable (such as a VU meter). Finally, a module can have neither outputs nor inputs, and can do its work entirely in terms of side effects to itself (modifying its own state) or to other modules (modifying the render variables of other modules). Such a module could be used, for example, in testing other modules, when strictly-repeatable sample-synchronous updates are needed. Render functions must never write to their inputs. To see why this is true, consider a module whose output fans out to several other modules. If the first module wrote to its input, it would corrupt the input to the second module. However, the VisualAudio Designer routing algorithm knows the overall connection between audio modules and may reuse the same patch buffer for the input and output of a module, when it is safe. For more details, see Pointer Aliasing Rules below. Module Usage Scenarios There are two ways that VisualAudio modules can be used: • In a drag-and-drop fashion from VisualAudio Designer - Memory allocation, parameter setting and calling of the render function are handled automatically. • As C-callable functions in a stand-alone library - Memory allocation, parameter setting and calling of the render function are all handled by the user’s C or assembly code. Even if a module is used in drag-and-drop fashion, its render variables may be modified in the DSP program’s control code (sometimes referred to as “user control code.”) Similarly, a module used in a drag-and-drop fashion may include, in its implementation, a render function that calls other render functions using the stand-alone style. This document contains information on developing modules that may be used in either style of usage. For more information on usage, see the document VisualAudio Module Library Usage Guide. For more information on the particular modules supplied by VisualAudio, see VisualAudio Module Library Reference for Blackfin and VisualAudio Module Library Reference for SHARC. Module Modes When used within a layout generated by VisualAudio Designer1, a module may be in one of four modes. These can be set at runtime with the following function: AMFSetModuleStatus(AMF_Module *module, AMF_ModuleStatus status) The possible status values and their meanings are given below. • AMFModuleStatus_ACTIVE. The module processes its inputs and writes its outputs via its render function each time it is run. This is the default mode. Note that a module may have several alternative render functions, but one must be specified as the default. • AMFModuleStatus_INACTIVE. The module is not run. This implies that its outputs are not written, leaving their contents undefined. • AMFModuleStatus_MUTED. The module's outputs are zeroed each time it is run. This behavior is provided automatically. You need not write any code to implement this mode. 1 More specifically, when used with the VisualAudio Layout Support library. 7 of 51 • AMFModuleStatus_BYPASSED. The module performs the bypass function, which means that its input(s) are copied to its output(s) each time it is run. The default algorithm copies audio inputs to audio outputs, copies signal inputs to signal outputs, and mutes unused outputs. Where there is a mono/stereo mismatch, stereo is converted to mono by adding the channels and dividing by two; mono is converted to stereo by duplicating the channel. Alternatively, the module designer may provide a custom bypass function. For more information, see How to Write a Custom Bypass Function below. The default bypass algorithm copies the Nth input pin of a given type to the Nth output pin of the same type. For example, the 3rd control pin input is copied to the 3rd control pin output. If there are more output pins than input pins, the remainder are muted. Note that for the purposes of bypass, stereo and mono pins are considered the same type. If a mono input matches a stereo output, the mono input is duplicated on both channels. If a stereo input matches a mono output, the stereo channels are added and divided by 2. Parts of a Module A module consists of these parts: • A header (.h) file that defines the run-time interface to the module, including the instance structure typedef. The name of this file must be the same as the module name with .h (for example, AMF_Scaler.h). • The module’s run-time DSP code, in source or binary form (e.g., to protect any intellectual property). The VisualAudio Module Library is delivered in binary form as a VisualDSP++ .dlb file, and the source is also included. If delivered in source form, the module must contain the following two parts: • The module’s render function, which implements the module’s primary function • The module’s class object, which describes the module to the run-time system • A .xml file that describes the module to VisualAudio Designer in detail. This file is not required if the module is never used with VisualAudio Designer. The name of this file must be the same as the module name, with .xml appended (for example, AMF_Scaler.xml where “AMF” stands for Audio Module Format). The .xml file includes information about what files constitute the module’s run-time and header files, as well as information about the module’s parameters, and may also include simple design formulas. How to Add a Module to VisualAudio Designer To make a custom SHARC module available to VisualAudio Designer, create a directory (we’ll call it xxx) and put the XML, include, source files and object files1 in sub-directories. For the SHARC, the subdirectories should be: • XML files in xxx\SHARC\XML\ • Header files in xxx\SHARC\Include\ • Source files in xxx\SHARC\Source\ • Object files in xxx\SHARC\Lib For the Blackfin, they should be: • XML files in xxx\Blackfin\XML\ • Header files in xxx\Blackfin\Include\ • Source files in xxx\Blackfin\Source\ • Object files in xxx\Blackfin\Lib Where xxx is your Modules directory. You must then add your Modules directory to the list of directories searched by VisualAudio Designer. See the VisualAudio Designer User's Guide for details. 1 Third parties can protect their IP by delivering it as a library (a .dlb). Alternatively, they can deliver it is as a pre-compiled or pre-assembled object file (a .doj). 8 of 51 You must add your custom module source files to the VisualDSP++ project (.dpj) file for your platform. In contrast, when a module is included in object form (.dlb or .doj), it is automatically added to the linker list via the VALinkerCmds.txt file. NUMERICS ON THE BLACKFIN AND SHARC The primary difference between Blackfin and SHARC modules is the use of floating point on the SHARC. On the Blackfin, floating point is not available in hardware; hence Blackfin modules typically operate in fixed point. The basic VisualAudio signal type on the Blackfin is fract32, a 32-bit 1.31 format fraction. The basic VisualAudio signal type on the SHARC is a float, a 32-bit floating point number. To ease the task of moving between SHARC and Blackfin, VisualAudio defines a type AMF_Signal, which is fract32 for Blackfin and float for SHARC. Most SHARC modules use floating point internally. However, extended precision SHARC modules may use fixed point internally. Most Blackfin modules use fixed point internally. A number of conventions have been established for fixed-point processing on the Blackfin. We recommend that custom modules obey these conventions for maximum compatibility: The default format for fixed point coefficients is 1.31. Coefficients which perform a “volume scaling” can be 16 bits (typically 1.15 format), so that faster 16x32 multiplication can be used (as opposed to 32x32), since a volume-like scale tends not to need to be represented with an extremely high precision. Smoothing of 16-bit coefficients may need to be performed at 32 bits (to allow the smoothing to move at very slow smoothing rates), but the top 16 bits can still be used for doing the volume scaling cheaply. Headroom in signals is assumed to be managed by the layout creator, not by the module or by VisualAudio. Therefore, except where noted, a Blackfin module assumes 1.31 input and output signals, and for compatibility a SHARC module assumes signals where 1.0f corresponds to maximum amplitude (though clipping to +/- 1.0 is only implemented at the output). Saturating arithmetic is used in fixed point modules. In fixed point modules, multiplications implemented to “31-bit” precision (i.e. discarding the low order product as a speed optimization) may be used as a satisfactory substitute for full 32x32 multiplications. 16 bit types (fract16 and int16 ) as module variables are not supported on the SHARC in VisualAudio. The module implementer is responsible for creating correct alignment in the module state structure, if necessary (via padding and/or ordering). This is an issue only with Blackfin modules. The structures allocated by VisualAudio Designer can be assumed to be aligned to 32-bit boundaries. EXAMPLE 1A – MONO PARAMETRIC SCALING The following example shows a parametric scaling of a mono signal, for both SHARC and Blackfin versions of VisualAudio Example 1A Header File: AMF_Scaler.h The example module’s header file is shown below, for the SHARC or Blackfin version of VisualAudio: /***** Begin AMF_Scaler.h *******/ // Include header file with base class definitions: #include "AudioProcessing.h" // Instance structure typedef 9 of 51 typedef struct { AMF_Module b; // Parameters AMF_Signal amplitude; } AMF_Scaler; // Class object declaration extern const AMF_ModuleClass AMFClassScaler; /**** End AMF_Scaler.h *****/ Notice that the instance structure begins with an embedded struct of type AMF_Module. All module instance structures must begin in this manner (this allows any module’s struct to be interpreted as an AMF_Module, hence implementing a form of inheritance). This struct is followed by a single render variable, amplitude. The structure for the Blackfin and SHARC versions of the module are identical, except for the definition of AMF_Signal as fract32 instead of float in AudioProcessing.h. Example 1A Code File: AMF_Scaler.c The example module’s C code file is AMF_Scaler.c. The first half of the C file for the SHARC version of the module is listed below and analyzed in detail, with comparisons to the Blackfin version as necessary. /****** Begin AMF_Scaler.c *********/ #include "AMF_Scaler.h" // The module's header file #pragma optimize_for_speed // VisualDSP++ directive SEG_MOD_FAST_CODE void AMF_Scaler_Render( AMF_Scaler *restrict instance, AMF_Signal * restrict * buffers, int tickSize) { int i; AMF_Signal *in = buffers[0]; AMF_Signal *out = buffers[1]; AMF_Signal amplitude = instance->amplitude; #pragma SIMD_for for (i=0; iamplitude; #pragma SIMD_for for (i=0; iamplitude; for (i=0; i tag with value 2. To make it easy to supply values for the type vector, the following macros are supplied: #define AMF_StereoPin(whichPin) \ (AMFPinType_STEREO<<(whichPin*4)) #define AMF_ControlPin(whichPin) \ (AMFPinType_CONTROL<<(whichPin*4)) #define AMF_MonoPin(whichPin) (0) #define AMF_SpectrumRealPin(whichPin) \ (AMFPinType_SPECTRUM_REAL<<(whichPin*4)) #define AMF_SpectrumComplexPin(whichPin) \ (AMFPinType_SPECTRUM_COMPLEX<<(whichPin*4)) #define AMF_SpectrumHalfRealPin(whichPin) \ (AMFPinType_SPECTRUM_HALF_REAL<<(whichPin*4)) #define AMF_SpectrumHalfComplexPin(whichPin) \ (AMFPinType_SPECTRUM_HALF_COMPLEX<<(whichPin*4)) Type descriptors can then be assembled by bitwise OR’ing of these macros. Note that the whichPin argument is zero-based. For example, if a module has one mono input followed by one stereo input, its input type designator could be written as: (AMF_MonoPin(0) | AMF_StereoPin(1)) Alternatively, it could be written directly as 0x10. If there are more than eight pins, then the high order nibble is assumed to be sticky and applies to all pins beyond eight. However, there are situations where this convention is inadequate, such as when a pin greater than the 8th has a type differing from the 8th. For these situations, an indirect form is available as follows: 13 of 51 If the AMF_ModuleClass flags field includes the bit AMFModuleClassFlag_INDIRECT_INPUT_PIN_TYPE, then the input type descriptor is actually a pointer to an array of sufficient length to support bit vectors for all input pins. Similarly, if the flags include the bit AMFModuleClassFlag_INDIRECT_OUTPUT_PIN_TYPE, then the output type descriptor is actually a pointer to an array of sufficient length to support bit vectors for all input pins. In modules with variable number of pins (described in a later section of this document), the input and output type descriptors are in the instance, rather than the class. Example 1A XML File: AMF_Scaler.xml The .xml file describes the module to VisualAudio Designer. In this discussion, we assume a minimal familiarity with XML. Please note that all module xml element type attributes (i.e. type = “string”, type = “float” etc.) are optional as of VisualAudio 1.6 and therefore, are not shown in the examples below. When creating a custom module, we recommend copying the XML file from an existing module, renaming the XML file, and modifying it. At the outermost level, the XML file looks like this: . . . It begins by telling the XML parser where to find the VisualAudio Designer schema, which is used to validate the file.1 Validating the file ensures that it has all the information needed by VisualAudio Designer, that it is structured correctly, that the fields are listed in the proper order, and that it contains legal values for the required fields. The actual module definition is inside the body of the tag, which includes the information detailed below. Module Fields A module has several different self-description tags • The