Hey all, Garth and I made some progress on this yesterday. We've got the code playing music now, but the audio's still not quite right. It sounds like our audio's 8-bit instead of 16-bit, so we'll have to figure that out.
If anyone's interested in playing with it, bug us and one of us will post an updated patch. :) Thanks, Albert On 7-Sep-08, at 2:54 AM, Garth Dahlstrom wrote: > I continue to plod away at this... > > Amazingly if you are familiar enough with the .m4a song, you can > pick out some familiar bits from the extremely gittery sound. > > I'm missing something, its probably something obvious, but I can't > spot it atm. > > To use the attached code, explode it in your src/ folder, make sure > you have libmp4v2-dev and libfaad-dev installed. Compile, run and > drop a M4A in your library, and load/play it. > > On my eeepc it only seems to correctly load the song 1/4th of the > time (and we always load at least two instances of a song every time > we start it on a deck: 1x waveform, 1x audio data, etc), so you have > to be patient when trying to load/play. > > Cheers, > > -G > > On Mon, Sep 1, 2008 at 11:10 PM, Garth Dahlstrom > <[EMAIL PROTECTED]> wrote: > So I decided to take another look at this work starting with some > digging through Ubuntu using "apt-get rdepends" to see what apps > depend on libmp4v2... I settled on a c application called cmus. > I thought maybe the code for the mp4 plugin could serve as a basis > for our own sound source file. > > I decided to have a go at converting the plugin to c++ and trying to > reduce the number of dependencies on other cmus source files... I'm > not a great pure c dev to begin with ( it took me a while to figure > out that I needed to explicitly cast stuff when moving from c -> c+ > + )... > > The attached code is as condensed as I could get it... I expect > this guts of this plugin will more or less replace the crap I > checked in before (with the exception of the parseHeader function I > wrote previously); i.e. a faad AAC decode is required to actually > get sound out of a m4a... I'm not sure how well the model for > fetching frames lines up with the soundsource format of reading data > cause I'm not too familar with either. > > Attachments: > - mp4-ged.cpp - modified version of cmus mp4.c > (http://repo.or.cz/w/cmus.git?a=blob_plain;f=mp4.chb=ed1b8ff4adff64788da84c51e4c149c824dcd7d6 > > ) > - *.h - header files needed to get it to compile > > g++ $(pkg-config --cflags QtCore) $(pkg-config --libs-only-l QtCore) > -lmp4v2 -lfaad -o mp4-ged mp4-ged.cpp > > The above command is how I tested I satisfied everything, it will > bitch about missing _start because it has no main() method. > > Hopefully this brain dump can serve to inspire others. :D > > -G > > On Sun, Aug 24, 2008 at 2:53 AM, Garth Dahlstrom > <[EMAIL PROTECTED]> wrote: > With r2269, I committed 5 updated files (soundsourcem4a.cpp) to > partially enable M4A support for Mixxx. If the C header for > libmp4v2 is found in your /usr/include directory (from "libmp4v2- > dev"), this will be enabled in the build. > > It's able to parse the header file, and I think the init is okay. > The read and seek functions don't work however... I roughed out > what I thought was needed for these, but they don't work. :( > > So, if anyone wants to take a crack at fixing this, I'd sure > appreciate the help. I've mostly been going off the docs for > mp4.h @ http://linux.die.net/man/3/mp4 > > Cheers, > > -G > > -- > __ > --- == __/ t.O ==-- > http://stacktrace.org/ > > > > -- > __ > --- == __/ t.O ==-- > http://stacktrace.org/ > > > > -- > __ > --- == __/ t.O ==-- > http://stacktrace.org/ > < > soundsourcem4a > -2008 > -09 > -07 > .tar > .bz2 > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win > great prizes > Grand prize is a trip for two to an Open Source event anywhere in > the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/_______________________________________________ > Mixxx-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/mixxx-devel ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Mixxx-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mixxx-devel
