[maemo-developers] [maemo-developers] dspmpeg4sink

[From: Pierre TARDY]

jeff zhu wrote:
> I'm interesting in this problem too ,  How to use dspmpeg4sink  .
It seems that nokia guys are not very verbose about their proprietary 
software.
Anyway, it seems that Koos Vriezen has done the reverse engineering job 
for its kmplayer port ( http://www.xs4all.nl/~jjvrieze/ )

He should have used dbus-monitor to catch the API between GUI and 
oss_media_player.

osso_media_server is providing some dbus API that we should call to play 
the video. It seems that gst-launch is not the good way to launch the video.

interresting lines are in kmplayerprocess.cpp:

    296             DBusMessage *message = dbus_message_new_method_call 
(NULL, "/com/nokia/osso_media_server", 
"com.nokia.osso_media_server.video", "set_vide        o_window");
    297             
dbus_message_set_destination(message,"com.nokia.osso_media_server");
    298             dbus_message_append_args (message, DBUS_TYPE_INT32, 
m_rect.x(), DBUS_TYPE_INT32, m_rect.y(), DBUS_TYPE_INT32, 
m_rect.width(), DBUS_TYPE_I        NT32, m_rect.height(), 
DBUS_TYPE_INVALID);
    299             dbus_connection_send (connection, message, NULL);

    315     const char * service = !mrl->audio_only ? 
"com.nokia.osso_media_server.video" : "com.nokia.osso_media_server.music";
    316     DBusMessage *message = dbus_message_new_method_call (NULL, 
"/com/nokia/osso_media_server", service, "play_media");
    317     printf ("OssoMediaServer::play %s %s\n", service, (const 
char *) node->mrl ()->src);
    318     dbus_message_set_destination (message, 
"com.nokia.osso_media_server");
    319     dbus_message_append_args (message, DBUS_TYPE_STRING, (const 
char *) node->mrl ()->src, DBUS_TYPE_INVALID);

The problem is that ossomediaplayer seams to not allow building our own 
gstreamer pipeline, though, the udp streaming. may be difficult.
Maybe the ossomediaplayer accept sdp mrl or udp:// mrl, this has to be 
checked.
The other thing is that gstreamer 0.8 is not very good at networking. 
Maybe we should wait for OS 2006 to have gstreamer 0.10 and its h263 
over RTP support.


>  
>
>
>  
> 2006/6/3, M M <mikel_m01 at yahoo.com <mailto:mikel_m01 at yahoo.com>>:
>
>     Hi Bob,
>     Thanks for your response!, It is not a typo, it is correct as
>     represented.
>     Thanks once again!
>      
>     Regards,
>     Michael
>      
>     // -
>      
>     Hi Michael
>
>     I hope your line below is a typo:)
>
>     gst-launch-0.8 udpsrc ! video/x-h263 ! dspmpeg4sink
>     I think should be
>
>     gst-launch-0.8 udpsrc | video/x-h263 | dspmpeg4sink
>
>     ! should be | ??
>
>     Regards
>
>     Bob
>      
>
>
>
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-- 
Pierre Tardy