On Mon, Mar 12, 2007 at 12:28:00PM +0100, Takashi Iwai wrote:

At Mon, 12 Mar 2007 00:24:36 +0100, Rask Ingemann Lambertsen wrote:

...

I tried to include u-law support, but it doesn't sound right and playback speed is about one third of what it should be. I could really use some documentation here. I'll remove it before submitting a final patch if I don't get it to work.

OK.

I never got u-law or a-law to work. I tried various ADPCM formats which gave correct playback speed, but much noise. There seems to be a Media Vision ADPCM format, which is probably what the Jazz16 wants, but I have no information about that format. FWIW, the playback_format/capture_format values I've tried are:

#define SB_DSP_ALAW_OUTPUT_AUTO 0x1F #define SB_DSP_ALAW_INPUT_AUTO 0x2F #define SB_DSP_ULAW_OUTPUT_AUTO 0x7f #define SB_DSP_ULAW_INPUT_AUTO 0x8f #define SB_DSP_ADPCM_OUTPUT_AUTO 0x7C+1 #define SB_DSP_ADPCM_INPUT_AUTO 0x8C+1

...

Setting the irq of the MPU-401 port requires the SB part to be active and even worse, DSP commands need to be sent. Would it be better to just use the MPU-401 port without an irq and avoid the complexity?

Isn't SB part already active? It's fine with non-irq version (which uses timer) if the code gets too complicated, of course.

It turned out that I can't disable just the MPU port.