Codec for drawing shapes on a VLC video

[SunnySingh]

Hi,

I am getting 2 tracks from a stream one of which is video and the other some properitory data.
The propertitory data contains coordinates to fray some shapes like lines and rectangles.
I am able to set the FOURCC code for the tracks being received (say i set it to 'S','U','N','4') and I modified the codec modules\codec\svcdsub.c to identify itself as the decoder for my properitory track.

Now I want to draw the shapes .... from the code in svcdsub.c, I gather that i need to create a "subpicture_t" unit fron the data that I receive in the decoder. If I have the coordinates corresponding to the ends of a line say, x1, y1, x2, y2, would there be an example I can refer to for create a "subpicture_t" unit that represents a line?

Regards,
Sunny

[Jean-Baptiste Kempf]

Look at the OSD code.

[SunnySingh]

Thanks j-b, that did help.

I am trying to write a decoder for the data I am receiving. However, I see a crash in the "static int DecoderDecode( decoder_t *p_dec, block_t *p_block )"function of src/input/decoder.c during the check "if( p_dec->p_owner->p_packetizer )" Not sure what I am doing wrong. Any thoughts?

Would there be a guide that I can refer to write decoders?

Would appreciate your help.

[Jean-Baptiste Kempf]

Thanks j-b, that did help.

I am trying to write a decoder for the data I am receiving. However, I see a crash in the "static int DecoderDecode( decoder_t *p_dec, block_t *p_block )"function of src/input/decoder.c during the check "if( p_dec->p_owner->p_packetizer )" Not sure what I am doing wrong. Any thoughts?

Would there be a guide that I can refer to write decoders?

Would appreciate your help.

Use gdb to backtrace the crash...

There is no much doc on decoders since it changes very often, but take an easy one and leanr from it.