At Thu, 12 Feb 2009 18:50:45 +0100, Tim Blechmann wrote: > > hi all, > > one question about the pointer callback. > > the docs say: > > This callback is called when the PCM middle layer inquires the current > > hardware position on the buffer. The position must be returned in > frames, > > ranging from 0 to buffer_size - 1. > > i am using a ringbuffer to communicate with my audio device. but when > the position is reset to 0, alsa requests to stop the stream > (SNDRV_PCM_TRIGGER_STOP). > > the brief log is (4 periods of 64 frames): > stream_pointer at 64 > stream_pointer at 128 > stream_pointer at 192 > stream_pointer at 256 This is invalid. The pointer callback must return 0 in this case. The value the pointer callback returns is between 0 and buffer_size-1. Takashi > stream_pointer at 0 > > after returning 0, a stop is requested. > > am i missing something? > thanks, tim > > -- > tim@xxxxxxxxxx > http://tim.klingt.org > > Contrary to general belief, an artist is never ahead of his time but > most people are far behind theirs. > Edgar Varèse > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
