Linux-audio-dev January 2015

linux-audio-dev@lists.linuxaudio.org

13 participants
14 discussions

by Aurélien Leblond

Hi all, I'm porting the FFT Vocoder from AMS to ams.lv2. The FFT Vocoder is using fftw_complex, and I can compile my code if I use -std=c99 but not if I use -std=c++11 I get error like: error: incompatible types in assignment of ‘float’ to ‘fftw_complex {aka double [2]}’ modinforward[l2] = modbuf[l2] * window[l2]; error: cannot convert ‘double*’ to ‘__complex__ double’ for argument ‘1’ to ‘double creal(__complex__ double)’ p(p_modulatorfft)[l2] = logf(fabs (creal (modoutforward[l2])) + 1.0); error: invalid array assignment modinbackward[ lclfrq ] = modoutforward [l2]; carrinforward, carroutforward, carrinbackward, carroutbackward, modinforward, modoutforward, modinbackward, modoutbackward are pointers to fftw_complex. Would you guys have any idea why it doesn't compile in the c++11 standard? >From my research I saw there were some changes between c99 and c11 with complex numbers, but I can't figure out how to bring the code to C++11. Thanks in advance for the help, Aurélien

9 years, 11 months

Re: [LAD] [LAA] CLAP, new virtual instrument and effect plugin interface proposal

by Florian Paul Schmidt

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 03.01.2015 12:48, Alexandre Bique wrote: >> 3] It would make plugin development easier if it was required to >> call deactivate() on a plugin before clap_destroy'ing it. The >> additional burden on the host would be small. Is there a good >> reason for it to be this way? > > I did it this way for robustness reasons. Because even if the host > has a bug in his destroy code path and forgets to deactivate, the > plugin must handle this case correctly. OK, let me put it this way. It really is a number's game. Let's take a successfull plugin standard like VST. There's thousands, maybe tens of thousands of plugins, but maybe tens to hundreds of hosts. So there's an order of magnitude or two difference. Every plugin has to have this extra check. What are the chances that a few plugin authors forget to do this check? What are the chances that a few hosts get this wrong? What are the chances that plugins get fixed? What are the chances that hosts get fixed? Also it's just boilerplate code. If every plugin has to do it, then it shouldn't have to do it at all since it clearly can be automated. And the automation in this case is just the host calling deactivate before destroy. Give the plugin authors as much guarantees as possible. With the proposed way around plugins might work in some hosts that honour the standard, but not in others (I.e. ones that do call deactivate() before destroy() vs. those that do not). If you make calling deactivate() before destroy() a requirement this whole problem just goes away. It makes life easier for the plugin developer while not making life _much_ harder for the host dev. Also it's trivial to implement a test plugin for host devs to use that checks things like this - one that does basically just copy input to output but checks that lifecycle requirements are met by the host: - - abort() on calling process() before activate - - abort() on calling destroy before deactivate() - - etc.. Have fun, Flo -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJUp/nYAAoJEA5f4Coltk8Zk+AH/0mnqvtw09iw2Mccyj4UTzBY xgm7n0i9N664e2qk2a0JrmRs/gOxAy1ddMGiNbXzgfI+mMqdh1XRlIgm0APcu+mK xAyxsYQuNVM88wq1kVVETAve/dvdAqMVYFkwViR5a7HlPPZVzj0vAsbAJT8HNWE3 O9oayGVDkzvY30ax13ktrFGSiMgiY1qEZq9DhapxTSwr929LnIGHzCWNSEXTepxi iSF/5k4j61V/zEFCNjL1/gHOdvANwKTbSQTXcNUY8RrbiR6vU18H/7wEypIbNI9a 4s4lHdzw4paAcIuj/Xvjqc8NUGi67z6BGRKqDU9y6jPg99T7vqX4lFCIScFV2go= =0gbu -----END PGP SIGNATURE-----

9 years, 11 months

Re: [LAD] [LAA] CLAP, new virtual instrument and effect plugin interface proposal

by Florian Paul Schmidt

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Sending this to LAD (additionally to replying to the author directly) as I cannot post answers to LAA and maybe it's interesting to keep this discussion on LAD.. On 29.12.2014 16:48, Alexandre Bique wrote: > Hi, > > I worked on a new plugin interface, it is not yet finished and set > in stone, but ready enough to gather initial feedback and advice. > > The specification is hosted on github: > https://github.com/free-audio/clap and is available under the MIT > license. There is a generated specification document at: > http://free-audio.github.io/clap/ > > I hope that you'll find it interesting and give it a chance. > Thanks. > > Regards, > Hi, I'm just skimming over the generated docs. Generally it's a laudable effort but maybe a few years too late. I guess many people in the linux audio community would agree that there is no lack of plugin standards :) Some remarks: 1] The generated docs display rather badly in my browser as I cannot move the separator between the two "lanes" which results in the left one not being readable at least partly. http://i.imgur.com/4MhRWvf.jpg (yes, this is a two monitor setup with an upright 4:3 monitor on the left :)) 2] It would be cool if clicking on a function name in the left panel would take you to the function declaration in the right panel. E.g. clap_create. 3] It would make plugin development easier if it was required to call deactivate() on a plugin before clap_destroy'ing it. The additional burden on the host would be small. Is there a good reason for it to be this way? 4] The plugins collection query mechanism (with index 0) seems a little "hackish". Why not have extra functions for it? 5] tunning -> tuning (spelling) 6] Adding to 3]: Change some of the "should not" to "must not" as it would make the API semantics clearer. Example: "Also deactivate() should not be called if the plugin is not activated. Yet the plugin should handle a call to deactivate() even if it is not activated." How should it handle it? It would be simpler to just make this a "must not". Little additional burden on the host while making every single plugin easier to implement and less error prone.. That's it for now (it's how far I got into reading the spec). Have fun, Flo -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJUp8xtAAoJEA5f4Coltk8ZCogIALDFJMjfOrg3jeGrp6IB6dk/ 3LvICyE53XrdjZsBqbETAPY6LAIf5HOwuoyU8JbBPECirILKM0T5diK/+G9CMTJL gx93UTWkdWVFivVI79y5Rys+Fj3fRBpknBXttplATBohIeMWvam8ey2F5/6UN82H y3IVPp+y9CXsEZ6Ekv/Z25S5FWlBQ7X2mdojafWnxk8euJedPSAUFF3248LHvAaX oeNZkMX7KANlw+3r/8R0mOhez/Z1p016Q5/Ckc1U/t6kHoAeSHNSDmL1ONS/0hzL VEcVHjLoxSDpW3D2NksKtkTK6w98xHS7BQtG9Rm8c2h0ReA6JWXunE2MClbltVI= =jS92 -----END PGP SIGNATURE-----

9 years, 11 months

minos-one_v1.1

by Joël Krähemann

Hello everybody, please take a look at http://sourceforge.net/p/ags/files/minos-one_v1.1.iso It targets mainly users interested in gobject and gtk+ based applications. minos-one starts as default within openbox and proper systemd usage. It should be entirely based on Free Software, please report inappropriate content. Since threads aren't really reliable in `ags` me has some difficulties to get a screencast because system freezes and no input possible, but take a look at my google+ page of Advanced Gtk+ Sequencer - Linux 3.14.25-rt22 - Advanced Gtk+ Sequencer 0.4.2-21 - Swami - fluidsynth - LADSPA - ffmpeg - mplayer - wine-64 - dssi-vst - bristol - jackd - ...

9 years, 11 months

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Linux-audio-dev January 2015