Reinhard Nissl wrote:
Hi,
Christian Gmeiner wrote:
i am currently interested in this topic and wanted to know how VDR does handle this. If you dont know what AFD is: http://www.pjdaniel.org.uk/afd/index.html http://www.dtg.org.uk/publications/books/afd.pdf
I think that VDR needs a menuentry where the user must specify what kind of tv-set he owns (4:3 or 16:9). If we add this we could make use of the AFD header in VDR. Maybe i am wrong and AFD is allready supported by VDR.
Well, I've added extracting AFD information in xine. But so far, I do nothing more than storing this information as stream info.
Thats a good beginning...
As far as I can tell, VDR doesn't extract any AFD information from video streams. But it should not be too complicated to add this to cRemux::ScanVideoPacket(), due to the repacking of cVideoRepacker.
AFD information appears in the video stream after user data startcodes (0x000001B2) and these appear before picture start codes (0x00000100). Typically, there are only a few bytes between those startcodes. And as cVideoRepacker ensures a new PES packet for each picture, AFD information should be in the same 2048 byte block where ScanVideoPacket() finds the picture start code.
The next few lines are from xine-lib/src/libmpeg2/decode.c:
/* check Active Format Description ETSI TS 101 154 V1.5.1 */ else if (buffer[0] == 0x44 && buffer[1] == 0x54 && buffer[2] == 0x47 && buffer[3] == 0x31) { int afd = (buffer[4] & 0x40) ? (buffer[5] & 0x0f) : -1; _x_stream_info_set(mpeg2dec->stream, XINE_STREAM_INFO_VIDEO_AFD, afd); }
And these are from xine-lib/include/xine.h:
/* possible values for XINE_STREAM_INFO_VIDEO_AFD */ #define XINE_VIDEO_AFD_NOT_PRESENT -1 #define XINE_VIDEO_AFD_RESERVED_0 0 #define XINE_VIDEO_AFD_RESERVED_1 1 #define XINE_VIDEO_AFD_BOX_16_9_TOP 2 #define XINE_VIDEO_AFD_BOX_14_9_TOP 3 #define XINE_VIDEO_AFD_BOX_GT_16_9_CENTRE 4 #define XINE_VIDEO_AFD_RESERVED_5 5 #define XINE_VIDEO_AFD_RESERVED_6 6 #define XINE_VIDEO_AFD_RESERVED_7 7 #define XINE_VIDEO_AFD_SAME_AS_FRAME 8 #define XINE_VIDEO_AFD_4_3_CENTRE 9 #define XINE_VIDEO_AFD_16_9_CENTRE 10 #define XINE_VIDEO_AFD_14_9_CENTRE 11 #define XINE_VIDEO_AFD_RESERVED_12 12 #define XINE_VIDEO_AFD_4_3_PROTECT_14_9 13 #define XINE_VIDEO_AFD_16_9_PROTECT_14_9 14 #define XINE_VIDEO_AFD_16_9_PROTECT_4_3 15
But don't expect this feature to be part of VDR-1.4.
I dont expect it, but i think it might be very usefull. I come to this topic, becuase there is an patch for the dxr3 plugin and dxr3 driver, which includes such afd header support, but i dont think its the best way to it this way.
Also i dont know how dvb driver support such stuff. If they support it, we have a fine base to start wokring on this topic.
Greets