Hi, Now, I have this new driver which manages to open/close a pcm channel whenever one attempts to play a file with "play test.au", but complains (Sound protocol it not compatible) with "aplay test.au". Any idea what's wrong? Besides, I have no mixer defined (I would just to allow open/close a playback or capture channel, no more) and wonder if it is a problem? I am just loading the driver manually for now (insmod snd, snd-timer, snd-pcm, ...), is there any special configuration I need? How to tell the driver to unmute?
Thanks, Guilhem. > > > the copy and silence ops are called when write() is called (more > > > exactly on alsa it's ioctl) - the thread writing to the device does > > > actually work like DMA. on mmap mode, there is no such one. so you > > > need an extra thread (or if it's not too heavy then tasklet might be > > > available) anyway. > no, i posted to alsa-devel ML, a month ago or so. > the document you read is for the user library, not for the driver. > in your case, you need to copy the data on the buffer to the hw by > yourself. then what is the merit of mmap? > (well, it would be a bit more efficient than copy_from_user(), but > the advantage of copy_from_user() is that you can use non-contiguous > buffer while alsa's mmap supports, so far, only contiguous region.) > on alsa, when the program runs in the mmap mode, no read/write is > called but the data is read/written on the mmapped buffer, and the > also mmaped status is updated. during the app writes data, DMA > transfers the data from the mmaped buffer. > that is, the thread is free from the kernel mode. __________________________________________________ Do You Yahoo!? Yahoo! Health - your guide to health and wellness http://health.yahoo.com _______________________________________________________________ Have big pipes? SourceForge.net is looking for download mirrors. We supply the hardware. You get the recognition. Email Us: [EMAIL PROTECTED] _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
