Le lundi 10 octobre 2011 18:35:02 Pierre-Louis Bossart, vous avez ?crit : > > Whether passing multiple format infos to negotiate digital passthrough, > > or > > setting one of the PA_STREAM_FIX_* flags on a record stream, I'm a bit > > puzzled > > how the buffering attributes are supposed to work. > > > > Most of the values are expressed in bytes. How should the application > > negotiate certain timings then? The mapping of bytes to microseconds > > depends > > on the bitrate, which is not known to the application until after > > PulseAudio > > chooses the exact stream format and returns it. > > Actually there's no variable format. Yeah? I never said there were formats with variable bit rate. I said I don't know the format, hence the bit rate, until after the buffer attributes have already been transmitted. > With the IEC61937 format, the > compressed frames are padded with zeroes to reach the same bitrate as 2ch, > 16-bit PCM. In short if you have AC3 at 48kHz, PulseAudio will handle > 1,536 Mbits/s. You can set the buffering as if it was a PCM stream. I > would recommend you set -1 to all the fields and let PulseAudio select the > best buffering for low-power. This is only an option if there are no latency constraints. -- R?mi Denis-Courmont http://www.remlab.net/ http://fi.linkedin.com/in/remidenis
