On Fri, 2015-03-20 at 08:04 +1100, Brendon Costa wrote: > Hi all, > > I am developing a pulse audio sink module for a custom networked audio > device I have. > > This device only supports a very specific format: 3 channel > PA_SAMPLE_S16NE @ 32000Hz and uses a custom TCP protocol. > > I am using the esound-sink module as a basis to develop my one and > have setup my pa_sample_spec accordingly. The module starts up, > pushing silence through to the device fine. > > However when I try and connect a music player source to it I get the > following assertion: > > sink-input.c: Assertion 'pa_frame_aligned(nbytes, > &i->sink->sample_spec)' failed at pulsecore/sink-input.c:1168, > function pa_sink_input_update_max_request(). Aborting. > > I couldn't make much sense of this assertion. Is someone able to help > me out with its meaning/cause? The assertion means that the nbytes parameter of pa_sink_input_update_max_request() was not a multiple of the size of one frame. If the sink in question is the sink that you're developing, i.e. the audio format is 3 channels with 16-bit samples, the size of one frame is 6 bytes. Check who called the function and why it gave a number that is not a multiple of 6. > My original guess is that it is related to this specific sample spec > not matching the music players source spec (though weird that such an > error would be an assertion so I am probably wrong). > > Is pulse audio supposed to auto "match" sample specs between sinks and > sources? You probably mean "sink inputs" instead of "sources". A music player application is represented by a "sink input". A "source" would be a capture device. But to answer your question: yes, when the audio format of a sink input doesn't match the format of the sink, the audio is automatically converted to the right format. -- Tanu
