I have a sound card Focusrite Scarlett 2i2 USB with a DAC supporting many sample rates : 44100, 48000, 88200, 96000, 176400, 192000 Hz However, pulseaudio can only switch at runtime between 2 sample rates, defined by default-sample-rate and alternate-sample-rate in the daemon config file. I don't understand this limitation. - It's very painful when you want to play successively audio files of different sample rates. You have to kill pulseaudio daemon, change its conf, then restart it. - It's not efficient quality wise to resample 192000Hz audio to 48kHz. It's rejecting above average audio uses. - It's not efficient performance wise to do resampling if this can be avoided because hardware doesn't need it. - Pulseaudio can know all the supported sample rates of my sound card (ie: $cat /proc/asound/card2/stream0) so pulseaudio could dynamically switch to the proper sample rate. I tried a little hack in src/pulsecore/sink.c and source.c to let pulseaudio ask the desired sample rate rather than to be limited to default-sample-rate and alternate-sample-rate and it seems to work. Now, if I play audio files successively with a single application, the sample rate of the hardware is changed dynamically for each audio file for each audio file. Of course if an audio stream is already playing, the sample rate cannot change (there is a safeguard in the pulseaudio code). But this is already a limitation already in the actual behavior. So in the end, it's working the same as now, except that the first audio stream can use a higher sample rate than the default/alternate sample rates. Did I miss something?
