文件名称:
Programming directshow
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上传时间: 2008-11-04
详细说明： This book has been written for the complete DirectShow novice; you don’t need to know anything about DirectShow—or even audio or video—to get started. If you’re already familiar with DirectShow, chances are you’ll be able to race through the first three chapters of this book very quickly. However, it’s always a good idea to review the pages, just to see if there’s anything covered that you might not be familiar with. The basics covered in Part I of this book include a firm understanding of the DirectShow filter, which is the co re component of all DirectShow applications. Filters come in three flavors, as mentioned earlier—capture filters, transform filters, and render filters—and they’re connected together to process a media stream from source to renderer. To demonstrate this, we’ll open up the DirectShow prototyping application, GraphEdit, which allows you to visually explore DirectShow filters, creating your own DirectShow applications with nothing more than a few clicks of the mouse. Next we’ll dive headlong into some C++ programming with the Microsoft Component Object Model (COM), the interface “wrapper” for DirectShow filters, and create some very simple C++ programs (only a few tens of lines of code each) illustrating how DirectShow can be used to play a range of media files. If you’re planning to use DirectShow only to add some media playback to your application, this basic information might be all you’ll ever need to read. With the basics behind us, we’ll dive headlong into DirectShow. The organization of Part II of the book echoes the three basic types of DirectShow filters: capture, transform and renders. We’ll explore how to capture audio and video from a broad range of sources, including camcorders, broadcast TV capture cards, and webcams. Each of these devices has its own peculiar properties, so each chapter explores a different capture device. An example application is included with each chapter, which could be used in a “cookbook” formula for your own applications. (Go ahead; reuse this code.) Next, we’ll explore the DirectShow editing services, which allow you to slice-and-dice video and audio streams and then “paste” them back together along a timeline. Finally, we’ll focus on the Video Mixing Renderer (VMR), a powerful new addition to DirectShow that allows you to mix multiple video streams into a single stream. By the end of Chapter 9, you’ll have a thorough understanding of media capture, editing, and rendering within DirectShow. In Part III you’ll learn how to write your own DirectShow transform filters; when you’re done with this section, you’ll be able to extend DirectShow in any way you’d like, either with a custom DirectShow filter or by creating a DirectX Media Object (DMO), which is similar to a DirectShow filter but can also be used in other DirectX applications. Starting with a DirectShow filter that converts color video to black and white, we’ll explore a framework that could form the basis of almost any transform filter of your own design. Using another DirectShow filter known as Sample Grabber, which grabs media samples as they pass through the filter, you’ll see how to add your own application-level processing to DirectShow. That’ll be followed by coverage of source filters, and you’ll learn how to write your own source filters, producing media streams for DirectShow to process. Finally, we’ll explore the world of DMOs, creating an audio delay effect that can be used within DirectShow or in DirectSound, the audio library for DirectX applications. The two concluding chapters cover advanced topics that will interest dedicated DirectShow programmers: the AVI format and the Windows Media Format. We’ll get down and dirty into the bits and bytes of the AVI format, which will come in handy if you’re ever creating the kind of code that manipulates or creates media streams—inside or outside of DirectShow. Windows Media Format is a brand-new architecture that provides unprecedented flexibility in the creation and management of a wide range of media formats, and we’ll learn how to compose our own Windows Media streams programmatically. A comprehensive reference for DirectShow could easily run to 1000 pages. The DirectX SDK has a complete set of documentation on DirectShow, and those pages are the final authority. This book is a complement to the SDK documentation to help you get your feet wet with DirectShow. Before you finish this book, you’ll find that DirectShow is one of the hidden jewels of the Microsoft operating systems—a powerful platform for multimedia that’s easy to use and performs well on a wide range of hardware. You’ll have no trouble dreaming up your own DirectShow applications, and after you’ve read this book, you’ll understand how to bring them to life. Although this book has been reviewed and fact-checked, I alone am responsible for any factual errors you might find in the text. Please e-mail me at mark@playfulworld.com if you find one so that it can be corrected in subsequent editions. ...展开收缩
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