Arve Knudsen <[EMAIL PROTECTED]> writes: >Hi Nick > >Since you're looking into different alternatives, have you considered >PortAudio (www.portaudio.com)?
Had not heard of it before. Looks interesting. >The ALSA implementation of v19 (development >branch) is well developed, and fairly stable from what I can see (being >one of the developers). There hasn't been a lot of feedback, but my own >testing hasn't turned up any bugs in a while. I few clicks but nothing too horrible. >PortAudio also offers two >different interfaces to the programmer, both blocking and callback >interfaces are completed for the ALSA implementation. So you can choose >whichever suits your application the best. patest_write_sine produces a noise but it isn't a sine wave (by ear there are some "sharp edges" in the waveform). patest_sine_formats hangs apparently forever. >At the same time, should you >wish to write cross-platform programs, PortAudio supports different >platforms. I don't know the current state of all the implementations, but >Windows MME and ASIO should be well functional and SGI IRIX seems to be >coming along. > >Hope this helps If nothing else it serves as example code for oss/alsa/jack setup. Will not rule it out. > >Arve Knudsen > >On Fri, 02 Jan 2004 18:15:12 +0000, Nick Ing-Simmons ><[EMAIL PROTECTED]> wrote: > >> >> I have two Audio related projects that need updating. >> >> 1. "rsynth" formant based text-to-speech synthesis >> >> 2. Audio::* Perl modules. >> >> Both have existing /dev/dsp style backends at present, which have been >> working >> fine. But recently (SuSE 9.0 install?) when run under ALSA emulation of >> /dev/dsp they both started producing segfaults - "after program had >> exited", >> (neither valgrind nor gdb can give any info on the fault). >> >> So I decided it was time to do a native ALSA backend(s). >> I have rsynth backend working, and perl Audio:: one almost working. >> But before going forward I would like to solicit opinions on what >> is the "right" API to use. >> >> The Linux audio world seems to be in a state of flux with these options >> (please tell me if I missed any): >> >> 1. Venerable OSS stuff >> - Widely available :-) >> - Some cards have quasi or truely commecial drivers rather than >> free / opensource ones :-( >> - emulation via ALSA (at least as shipped by SuSE) seems broken :-( >> >> 2. ALSA >> - Reasonably widely available :-|, and improving >> - Opensource :-) >> - Documentation is lacking :-( >> Everything hinges on the >> "Configuration Space" concept, but I can't find an explanation of >> how that works. This is the sticking point with perl code - I can't >> find >> how to change the sample rate / channels, so _seems_ I need to >> close and re-open. >> >> 3. JACK >> - Gets lots of excited "this is cool" kind of coverage :-) >> - realtime :-) >> - Callback style not ideal for speech synthesis or play-from-file >> of my simple apps. complex :-( >> >> 4. Enlightenment Sound Demon >> - Seems to be used by KDE etc. >> - haven't looked into it further. >> >> 5. Network Audio System >> - Works on many platforms Linux/Solaris/X Terminals :-) >> - X-like "imake" style rather than configure :-( >> - Linux version still seems to be based on OSS - so recurse ;-) >> >> 6. Presumably there is some kind of telephony API as well, for sending >> sound to incomming phone calls via modem / ISDN >> >> Complexity and callbacks don't scare me - I do perl/Tk after all! >> But this is a 2nd-string project so I don't want to do a lot of >> complex stuff for an API that is vanishing - I would rather either >> use a simple stable interface, or pitch in and help on the "comming" >> complex API. >> >> Suggestions anyone? (I just subscribed to both lists - so reply to your >> favourite list.) >> >> >> >> >> >> >> >> ------------------------------------------------------- >> This SF.net email is sponsored by: IBM Linux Tutorials. >> Become an expert in LINUX or just sharpen your skills. Sign up for IBM's >> Free Linux Tutorials. Learn everything from the bash shell to sys admin. >> Click now! http://ads.osdn.com/?ad_id78&alloc_id371&op=click >> _______________________________________________ >> Alsa-devel mailing list >> [EMAIL PROTECTED] >> https://lists.sourceforge.net/lists/listinfo/alsa-devel > > >------------------------------------------------------- >This SF.net email is sponsored by: IBM Linux Tutorials. >Become an expert in LINUX or just sharpen your skills. Sign up for IBM's >Free Linux Tutorials. Learn everything from the bash shell to sys admin. >Click now! http://ads.osdn.com/?ad_id78&alloc_id371&op=click >_______________________________________________ >Alsa-devel mailing list >[EMAIL PROTECTED] >https://lists.sourceforge.net/lists/listinfo/alsa-devel ------------------------------------------------------- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. 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