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510 Part IV . Running Applications Just to make things clear, while the codecs just discussed do not include built-in DRM features, some codecs are specifically designed to integrate with DRM solutions. In other words, all of these codecs can theoretically be used to play encoded content on a Linux system. If the content is protected by a DRM solution, the likelihood that the content is playable on a Linux system is fairly remote. Despite this fact, or perhaps because of it, Linus Torvalds has not excluded the possibility of including support for DRM in Linux. Likewise, several open source projects are working on Linux DRM solutions. Playing Music With an understanding of the challenges and advances in digital media under your belt, let s move on to actually putting digital media to use. This section shows you how to set up your Linux installation for audio playback. It examines the process for getting the hardware up and running and then explores available software options for audio playback. Setting Up Audio Cards To start your quadraphonic wall of sound, you need to have a sound card in your PC. A sound card can be an add-in PCI (or even ISA) card, or it can be integrated on your motherboard. Your card will have a ton of uses from gaming to audio/video playback. Having a multimedia system just isn t the same without sound. Fortunately most modern PCs include a sound card, often of the integrated variety. In the rare case that one isn t included (or the slightly more common case where it isn t supported in Linux), you can add a supported sound card starting for only a few dollars. If you re really pinched, check out eBay, where you probably can get a decent SoundBlaster (still the standard) compatible card for next to nothing. If you try the procedures in this book but still don t have a working sound card, visit the Advanced Linux Sound Architecture at www.alsa-project.org, home of the ALSA sound architecture. ALSA is the preferred sound software for Linux and is built into the Linux kernel itself (beginning with the 2.6 kernel). The ALSA site offers support, information, and help. The following list summarizes the basic features that are included in the popular SoundBlaster family of sound cards: . Sound recording and playback The card can convert analog sound into 8-bit or 16-bit digital numbers. To convert the sound, the board samples the sound in waves from 5 KHz to 48 KHz, or 5,000 to 48,100 times per second. The higher the sampling rate, the better the sound and larger the output files. Note
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