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| 1 | Recording | ||
| 2 | --------- | ||
| 3 | |||
| 4 | Recording does not work on the author's card, but there | ||
| 5 | is at least one report of it working on later silicon. | ||
| 6 | The chip behaves differently than described in the data sheet, | ||
| 7 | likely due to a chip bug. Working around this would require | ||
| 8 | the help of ESS (for example by publishing an errata sheet), | ||
| 9 | but ESS has not done so far. | ||
| 10 | |||
| 11 | Also, the chip only supports 24 bit addresses for recording, | ||
| 12 | which means it cannot work on some Alpha mainboards. | ||
| 13 | |||
| 14 | |||
| 15 | /proc/sound, /dev/sndstat | ||
| 16 | ------------------------- | ||
| 17 | |||
| 18 | /proc/sound and /dev/sndstat is not supported by the | ||
| 19 | driver. To find out whether the driver succeeded loading, | ||
| 20 | check the kernel log (dmesg). | ||
| 21 | |||
| 22 | |||
| 23 | ALaw/uLaw sample formats | ||
| 24 | ------------------------ | ||
| 25 | |||
| 26 | This driver does not support the ALaw/uLaw sample formats. | ||
| 27 | ALaw is the default mode when opening a sound device | ||
| 28 | using OSS/Free. The reason for the lack of support is | ||
| 29 | that the hardware does not support these formats, and adding | ||
| 30 | conversion routines to the kernel would lead to very ugly | ||
| 31 | code in the presence of the mmap interface to the driver. | ||
| 32 | And since xquake uses mmap, mmap is considered important :-) | ||
| 33 | and no sane application uses ALaw/uLaw these days anyway. | ||
| 34 | In short, playing a Sun .au file as follows: | ||
| 35 | |||
| 36 | cat my_file.au > /dev/dsp | ||
| 37 | |||
| 38 | does not work. Instead, you may use the play script from | ||
| 39 | Chris Bagwell's sox-12.14 package (or later, available from the URL | ||
| 40 | below) to play many different audio file formats. | ||
| 41 | The script automatically determines the audio format | ||
| 42 | and does do audio conversions if necessary. | ||
| 43 | http://home.sprynet.com/sprynet/cbagwell/projects.html | ||
| 44 | |||
| 45 | |||
| 46 | Blocking vs. nonblocking IO | ||
| 47 | --------------------------- | ||
| 48 | |||
| 49 | Unlike OSS/Free this driver honours the O_NONBLOCK file flag | ||
| 50 | not only during open, but also during read and write. | ||
| 51 | This is an effort to make the sound driver interface more | ||
| 52 | regular. Timidity has problems with this; a patch | ||
| 53 | is available from http://www.ife.ee.ethz.ch/~sailer/linux/pciaudio.html. | ||
| 54 | (Timidity patched will also run on OSS/Free). | ||
| 55 | |||
| 56 | |||
| 57 | MIDI UART | ||
| 58 | --------- | ||
| 59 | |||
| 60 | The driver supports a simple MIDI UART interface, with | ||
| 61 | no ioctl's supported. | ||
| 62 | |||
| 63 | |||
| 64 | MIDI synthesizer | ||
| 65 | ---------------- | ||
| 66 | |||
| 67 | The card has an OPL compatible FM synthesizer. | ||
| 68 | |||
| 69 | Thomas Sailer | ||
| 70 | t.sailer@alumni.ethz.ch | ||