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phoenix |
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forte - an OSS/Lite driver for FortéMedia FM801 sound chips
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===========================================================
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This is a driver for cards using the FortéMedia FM801 audio
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controller. The Genius Sound Maker Live card and the onboard audio in
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HP Workstation zx2000 has been tested.
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Both IA-32 and IA-64 architectures are supported, but the driver
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should work on any platform.
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The FM801 controller supports a variety of AC'97 codecs. This driver
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lets the OSS core code figure the codec out, and should thus support
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any codec with support in the Linux kernel.
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The driver supports /dev/mixer and /dev/dsp for generic OSS audio
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support. In general it adheres to the OSS spec to the extent it can
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be done with the way the hardware works. The FM801 controller doesn't
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support scatter-gather, so if the application sets fragment size too
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low, it puts strict requirements on interrupt processing speed. The
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driver tries to compensate by enforcing bigger buffers than requested
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by the application if the fragment size is low.
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The forte driver includes both standard read()/write() and the
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unsupported mmap() interface used by Quake. mmap() is only supported
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in playback mode.
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U8 and S16 audio formats are supported, mono/stereo, as well as most
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all sample rates implemented by the chip. Default is 48 KHz, 16-bit,
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mono.
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MIDI, FM audio, and the gameport controller are not currently
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supported.
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The latest version of this driver can be found at:
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http://mkp.net/forte/
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Martin K. Petersen, July 2002
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