'Twas brillig, and ANISH KUMAR at 06/04/10 12:37 did gyre and gimble: > As my question is related to the query what pradeep is asking and mark brown also suggested to me to use PA. > I have some additional questions regarding PA which i would like to clarify before starting: > > 1.Does PA have good resampler code if my hardware doesn't support resampling? Yes. Infact this code will likely be needed in several cases when the h/w does support resampling. If PA has multiple streams playing at once, the h/w will likely only be able to cope with one rate at a time. The resamplers are pluggable and can have optimized implementation for some hardware - e.g. I believe Palm wrote an ARM specific resampler to do this for their Pre platform (I could be mis-remembering tho'). > I have a system where we are using ALSA as the base and on top(application side) of it there is a thread running which > is pumping data and this thread is started by java code.Combination of LINUX+JAVA. > This thread can perform these tasks: > 1.Resampling for some rates. > 2.Talking to PV framework to get the decoded PCM data and pumping audio data to alsa. > 3.Routing support using asound.conf file. > Can i replace this thread with PA by writing some wrapper over PA?? > What extra features PA is going to provide additionally if i start using PA other than what is listed above??As i know > PA is kind of sound deamon which my thread is not. One very interesting feature of PA that is particularly relevant to mobile platforms is the use of a timer-based model to drive the hard ware. This allows for very large latencies to be used (e.g. 10-20s) allowing for very efficient processor usage - only waking up when absolutely necessary, not to service interrupts. More info: http://0pointer.de/blog/projects/pulse-glitch-free.html This approach can bring power savings and thus increased battery life. > Is there any good resampler code which i can use without any licensing problem and which can be > easily integrated??? I pretty sure the included resamplers are OK to use, but it's all clearly documented so just take a look. Like I say it's easy enough to include your own too if needs be. 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/] _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
