Hello ! (A question from an newbie-developer to make it perfect ;-)
I am writing an ALSA-lowleveldriver for the RME HDSP-MADI card. (which have 64Audion in and out and an 128in64(= 8192Fader) Mixer see http://www.rme-audio.de/hdsp/hdspmadi.htm ) Coding is quite complete but I have trouble with the memory management. The Card uses ScatterGather Buffer, each channel 64kB and this has to be asigned (to be safe) before activation, so I want to allocate SGbuffer (64+64)*64*1024=8388608 in 4k-blocks. I do a snd_pcm_lib_preallocate_pci_pages_for_all(hdspm->pci, pcm,8388608l,8388608l) after making the pcm_device. Here the questions: 1) How can I get the sgbuf pointer ? ... since in the streams runtime is not set and therefore (besides the Documentation says is (snd_pcm_sgbuf_t*)substream->dma_private which I couldnt find) sgbuf = (snd_pcm_sgbuf_t*)substream->runtime->dma_private; is not assigned. but when I activate the card (for MIDI for example) there must be memory asigned und I think doing it in hw_params is to late. 2) If it is bound to substream is always the same substream the capture or playback or are the assigned dynamically on calling ? mfg winfried ritsch ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
