On Thu, Jul 16, 2009 at 09:13:28AM +0900, jassi brar wrote: > On Thu, Jul 16, 2009 at 5:22 AM, Daniel Mack <daniel@xxxxxxxx> wrote: > > Are these decoder instruction something you need to do at runtime? Or > > would it suffice to provide them once when the driver is probed? > > The decoder insn, params atleast, depend upon the mp3 file i want the dsp to > decode and play. > So, let us assume, i have to load decoder insns and params into the dsp for > every mp3 file playback. Then the alsa control API seems appropriate. Unless there is any other interface for that specific purpose I'm not aware of. > Also, by what interface name(like I2S/PCM/AC97) shud my driver get encoded > mp3 data from my mp3-player and then decode that mp3 data by dsp and play > the output pcm stream? > I am afraid i must bypass/hack ALSA stack to directly get mp3 data from > user-space. Am i right? Have a look at include/sound/pcm.h - there are more formats defined than just linear PCM, and I think SNDRV_PCM_FMTBIT_MPEG could be something you can use. But I'm not sure and never used something like that before, so maybe anyone else can elaborate more? Daniel _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
