[pulseaudio-discuss] porting pulse audio to Android
I am working towards modying the android audio the stack so that it allows multiple outputs, e.g. routing media player audio to a headset while playing radio and nav instructions on the speakers. We are working towards using Pulse Audio for to achieve this. I need some help in understanding the amount of effort required to port Pulse Audio to Android. Any help in this regard would be of great use to us. best regards Priyanka Sharma ___ pulseaudio-discuss mailing list pulseaudio-discuss@mail.0pointer.de https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] porting pulse audio to Android
'Twas brillig, and priyanka sharma at 22/07/10 12:18 did gyre and gimble: I need some help in understanding the amount of effort required to port Pulse Audio to Android. Any help in this regard would be of great use to us. As far as the compilation etc. it shouldn't be too hard, but from what I understand the current reason PA is not on Android is purely from a licensing perspective. I believe the only GPL'ish code that is permitted as part of the official android stack is the kernel itself. I believe even libasound is tricky (I think the original rationale was to avoid confusion for 3rd party developers as to what code they had to release into the open and what bits they can keep private - the clear line of kernel patches need to be open, userspace does not). But I presume license issues are not a concern for you in this context. I guess then the problems would be with how android apps interact with audio? I'm not sure how they actually do their output or input? I believe there is a separate lib on andoird for this (I don't know the details but others on this list do so can maybe advise better) but perhaps it can be adapted to work with PA rather than plain alsa? Hopefully someone can chip in with more details of how hard the porting would be from a wider picture perspective. Col -- Colin Guthrie gmane(at)colin.guthr.ie http://colin.guthr.ie/ Day Job: Tribalogic Limited [http://www.tribalogic.net/] Open Source: Mandriva Linux Contributor [http://www.mandriva.com/] PulseAudio Hacker [http://www.pulseaudio.org/] Trac Hacker [http://trac.edgewall.org/] ___ pulseaudio-discuss mailing list pulseaudio-discuss@mail.0pointer.de https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] porting pulse audio to Android
On Thu, Jul 22, 2010 at 12:33:01PM +0100, Colin Guthrie wrote: 'Twas brillig, and priyanka sharma at 22/07/10 12:18 did gyre and gimble: I need some help in understanding the amount of effort required to port Pulse Audio to Android. Any help in this regard would be of great use to us. As far as the compilation etc. it shouldn't be too hard, but from what I understand the current reason PA is not on Android is purely from a licensing perspective. I believe the only GPL'ish code that is permitted as part of the official android stack is the kernel itself. Just to clarify, there's no problem with handset vendors including GPLed code if they want to (barring any licensing conflcits with other software on the device) - the concerns purely surround what is included by default as part of the Android platform release. I guess then the problems would be with how android apps interact with audio? I'm not sure how they actually do their output or input? I believe there is a separate lib on andoird for this (I don't know the details but others on this list do so can maybe advise better) but perhaps it can be adapted to work with PA rather than plain alsa? The high level architecture is this: http://source.android.com/porting/audio.html You'd end up tweaking an off the shelf ALSA libaudio to bounce via Pulse, possibly bypassing the ALSA abstractions and talking directly to Pulse for the data injection as well as using Pulse to configure any soft routing it does. Hopefully someone can chip in with more details of how hard the porting would be from a wider picture perspective. Should be fairly straightforward to get it working. ___ pulseaudio-discuss mailing list pulseaudio-discuss@mail.0pointer.de https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] Assert error in pulsecore/resampler.c:trivial_resample
2010/7/20 Tanu Kaskinen ta...@iki.fi: On Fri, 2010-07-16 at 23:22 +0200, Maarten Bosmans wrote: Hi, PulseAudio from git master crashes when I play a sound to a combined sink of two 96000 Hz sinks. It does not happen if the slave sinks are set to 48kHz. Playing directly two one of the slaves also works. [snip] Now, is it somehow possible that the rate difference is actually that huge? I don't think so, unless there's a bug in module-combine. Could you check with gdb what are the values of r-i_ss.rate and r-o_ss.rate when the crash happens? No, that's not it, they're both the same, 96000. (Attached is a snippet of gdb output, in which the structure r is printed) The source file (input stream for combined sink) is 44100 Hz, the slave sinks are at 96000 Hz. I tried specifying the samplerate for the combined sink. The lower the rate of the combined sink, the smaller the chance of the crash happening. For a rate 4 it seems to never crash. For about 42000-43000 it sometimes crashes, mostly after more than 30 seconds of audio. For 44000-45000 it usually crashes after 1-2 seconds and for higher samplerates it crashes every time after just a fraction of a second. What I further noticed is that the resampler for the stream from the combined sinks to the slave alsa sinks is always PA_RESAMPLER_TRIVIAL. Is that correct, even for a stream from, say, 41000 to 96000? I would think that for such a case something like PA_RESAMPLER_SPEEX_FLOAT would be necessary. -- Tanu Kaskinen Thanks for thinking along in debugging this, Maarten gdb.log Description: Binary data ___ pulseaudio-discuss mailing list pulseaudio-discuss@mail.0pointer.de https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss
[pulseaudio-discuss] pulseaudio debug mode
What is the best way to start PA for debugging and still have all the usual clients running? -- Chris KeyID 0xE372A7DA98E6705C signature.asc Description: This is a digitally signed message part ___ pulseaudio-discuss mailing list pulseaudio-discuss@mail.0pointer.de https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss
