Hi, I'm writing an io plugin that should transfer all PCM samples to a UNIX socket. For this reason in my plugin I open the socket and then fill the plugin struct like this: socketdump->io.mmap_rw = 0; socketdump->io.poll_fd = socketdump->sock_fd; socketdump->io.poll_events = POLLOUT; Thus for my understanding (the alsa doc is really bad), every time the socket file descriptor is available for writing the alsa plugin would generally speaking issue a data transfer. However, when playing audio over that plugin for some reason the start callback function is never called. Instead I get output like this: socketdump_hw_constraint:417 26944 _snd_pcm_socketdump_open:585 26944 SND_PCM_PLUGIN_DEFINE_FUNC(): done, err=0 Playing WAVE 'test_8khz_16LE_mono.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono snd_pcm_socketdump_prepare:309 26944 Preparing with io->period_size=164 io->buffer_size=3936 snd_pcm_socketdump_pointer:229 26944 hw_ptr: 0 () snd_pcm_socketdump_write:268 26944 snd_pcm_socketdump_write(): areas->step=16 areas->first=0 areas->addr=0x22f1f60 offset=0, size=164 io->nonblock=0 ...... Do you have any idea why the start callback function is not called at all ? cheers, stefan _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
