On Mon, Mar 2, 2009 at 11:58 PM, Clemens Ladisch <clemens@xxxxxxxxxx> wrote: > Richard Zhao wrote: >> runtime->hw.rates and runtime->hw.formats indicate the rate and >> formats hardware can support, so the user level plugins can >> auto-convert the audio data. But hardware may not support a certain >> combin of sample rate and format, > > Did you install your own constraint rules, as described in section > "Constraints" of "Writing an ALSA Driver"? > > > Best regards, > Clemens > Sure I can add rules. but the rules will be checked as hw_param. If hw_param failed, does alsalib convert fmt or sample rate automatically? For example: One codec, support: 44.1k : s8 s16 s24 s32 96k: s24 s32 When user try to play s8/s16 96k audio file, hw_param will fail. I don't know, how to let alsalib convert s8/s16 to s32 or convert 96k to 44.1k automatically? Thanks Richard _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
