You can use the default-sample-rate/alternate-sample-rate config values as minimal sample rates. So if you input a 8kHz audio stream, you resample it to 48kHz or 44.1kHz rather than let it to go 8Khz. I attached my patches. They just remove the limitation that the desired sample rate should be either default-sample-rate or alternate-sample-rate when the sink is opened. This was just a quick hack as I don't know pulseaudio source code at all. Feel free to discuss or modify them :) The resulting behavior is the following: New audio stream 88200Hz -> sink & source at 88200Hz Adding a stream at 441000Hz -> sink & source don't change their sample rate (still 88200Hz so). The additionnal stream is thus resampled to 88200Hz Shutdown sink, New audio stream at 441000Hz -> sink & source at 44100Hz Shutdown sink, New audio stream at 8000Hz -> sink & source at 44100Hz because there seems to be a lower limit (maybe 8Khz is not in the supported rates of the sound card :D ). I can add to the patch a software limitation so the desired sample rate can't be below default-sample-rate value for example. Best regards, Le dimanche 27 novembre 2016 à 17:16 +0200, Tanu Kaskinen a écrit : > The dynamic rate switching was added to deal specifically with the most > common case: switching between 44100 Hz and 48000 Hz. It's not that > supporting a more flexible policy is necessarily undesirable, it's just > that nobody has been interested enough to provide patches. > > One reason why we don't simply try to switch to whatever rate streams > happen to have is that we don't want to end up in a situation where one > stream causes the sink to run at 8000 Hz and then an overlapping higher > quality stream appears and suffers from the very low sink rate. > > So, if we relax the rate restrictions, we need to add at least a limit > for how low rates we accept. I don't remember if there were any other > considerations when this feature was discussed. If you provide patches > for improving the rate switching policy, at this point I don't see any > reason why such feature would be rejected. > -------------- next part -------------- A non-text attachment was scrubbed... Name: sink.patch Type: text/x-patch Size: 2141 bytes Desc: not available URL: <https://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20161127/41939bb1/attachment.bin> -------------- next part -------------- A non-text attachment was scrubbed... Name: source.patch Type: text/x-patch Size: 2123 bytes Desc: not available URL: <https://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20161127/41939bb1/attachment-0001.bin>
