On Wed, May 7, 2008 22:04, Stéphane Letz wrote: Please forward to the LAD mailing list, since I am not subscribed there, and unable to post. I will just describe briefly the current API. It would be nice everybody would agree that this is OK, otherwise please can we resolve this quickly - the project is going slowly enough as it is. ---------------------------------------------------------- The videojack patch adds a new port type - video. #define JACK_VIDEO_PORT_TYPE 2 There is no mixing function for video, since there are dozens or maybe hundreds of different ways to mix two or more video frames together; all mixing is done by a host application. Therefore each video buffer can have only one source, but may have multiple sinks. The size of the video buffer is initially set to 0x0, and the colorspace is set to the default (JACK_VIDEO_COLORSPACE_RGBA32). The source client only may set the frame size at any time, and may also change the colorspace. Although only RGBA32 is supported officially, other colorspaces may be used in private networks. The source client sets width and height using: int jack_video_set_width_and_height (jack_client_t *client, jack_port_t *port, uint32_t width, uint32_t height) and may set the colorspace with: int jack_video_set_colorspace(jack_client_t *client, jack_port_t *port, jack_video_colorspace_t cspace) These functions may only be called after the client is activated by the source. The functions also set the buffer size to 4*width*height. Likewise, there are the functions: uint32_t jack_video_get_width(jack_client_t *client, jack_port_t *port) uint32_t jack_video_get_height(jack_client_t *client, jack_port_t *port) jack_video_colorspace_t jack_video_get_colorspace(jack_client_t *client, jack_port_t *port) A client may set callbacks for these: int jack_set_video_colorspace_callback (jack_client_t *client, JackVideoColorspaceCallback video_colorspace_callback, void *arg); int jack_set_video_size_callback (jack_client_t *client, JackVideoSizeCallback video_size_callback, void *arg); Although probably the client would only get a buffer size change message, since jack can only send one message per change (seems to be a limitation in jackd). There is also a convenience function: void* jack_video_get_framebuffer(jack_port_t* video_port) which just does: return jack_port_get_buffer (video_port, 1); And that's it ! This is enough to get video working in jack. There are a couple of changes I plan to make, which are just nice-to- have: - make rate a float (for the video clock) - use an environment variable to define the location of ~/.jackdrc (this will go away if video and audio clocks can be combined in one server) Also I will patch jack_connect, jack_disconnect, and jack_lsp to take a server name. This is necessary right now if running two servers, video and audio. But it seems like a good idea to keep it in anyway. And as suggested, jack_set_video_process_callback() will just call jack_set_process_callback() (for now). Later it could link to a video clock in a combined server. There was a further suggestion that the input client can set a "frame count", which can be read by the output clients. This should also be feasable. -------------------------------------------------------- The current code is at: http://bekstation.bek.no/piksel/pikseldev/jack-vjack5.tar.bz2 The startup parameters I use are: /usr/bin/jackd -p 10 -t 40 -d dummy -r 25 -p 1 -P 0 -C 0 Note the last -p 1 is necessary, otherwise you get a floating point exception. All other parameters can be adjusted as necessary. There are also various clients - jack_video_test_generator and jack_video_output are shipped by default. On the piksel site there is a hacked version of camorama: http://bekstation.bek.no/piksel/pikseldev/camorama-vjack.tar.bz2 and ekiga: http://www.xs4all.nl/~salsaman/ekiga-2.0.12-hacked-for-vjack.tar.bz2 LiVES also supports vjack in an vjack out. You must compile it with --enable-vjack. The vjack output client can be selected in Preferences/Playback. The input client (generator) must be bound to an effect key (VJ/Realtime effect mapping), and then activated. Regards, Salsaman. _______________________________________________ Jack-Devel mailing list Jack-Devel(a)lists.jackaudio.org http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org