On Mon, Mar 2, 2009 at 11:58 PM, Clemens Ladisch clemens@ladisch.de 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