Hi Ross
Many of the IP camera to transfer the resolution of the frame use the
attributes of the "x-dimension" or "cliprect". As the implementation of
a "x-dimension" is already present in Live555. Can I suggest
implementing a parser for the "cliprect" attribute?
Best Regards,
Andrey Shadrin, Sarapul Systems, Ltd..
--- live-2012.09.13.orig/liveMedia/include/MediaSession.hh 2012-09-14 03:29:26.000000000 +0400
+++ live-2012.09.13/liveMedia/include/MediaSession.hh 2012-09-18 10:39:20.795538104 +0400
@@ -289,6 +289,7 @@
Boolean parseSDPAttribute_range(char const* sdpLine);
Boolean parseSDPAttribute_fmtp(char const* sdpLine);
Boolean parseSDPAttribute_source_filter(char const* sdpLine);
+ Boolean parseSDPAttribute_cliprect(char const* sdpLine);
Boolean parseSDPAttribute_x_dimensions(char const* sdpLine);
Boolean parseSDPAttribute_framerate(char const* sdpLine);
--- live-2012.09.13.orig/liveMedia/MediaSession.cpp 2012-09-14 03:29:26.000000000 +0400
+++ live-2012.09.13/liveMedia/MediaSession.cpp 2012-09-17 16:49:07.359377373 +0400
@@ -213,6 +213,7 @@
if (subsession->parseSDPAttribute_fmtp(sdpLine)) continue;
if (subsession->parseSDPAttribute_source_filter(sdpLine)) continue;
if (subsession->parseSDPAttribute_x_dimensions(sdpLine)) continue;
+ if (subsession->parseSDPAttribute_cliprect(sdpLine)) continue;
if (subsession->parseSDPAttribute_framerate(sdpLine)) continue;
// (Later, check for malformed lines, and other valid SDP lines#####)
@@ -1114,6 +1115,22 @@
return parseSourceFilterAttribute(sdpLine, fSourceFilterAddr);
}
+Boolean MediaSubsession::parseSDPAttribute_cliprect(char const* sdpLine) {
+ // Check for a "a=cliprect:<x1>,<y1>,<x2>,<y2>" line:
+ // x1,y1 - top left corner rect
+ // x2,y2 - bottom right corner rect
+ Boolean parseSuccess = False;
+
+ int x1, x2, y1, y2;
+ if (sscanf(sdpLine, "a=cliprect:%d,%d,%d,%d", &x1, &y1, &x2, &y2) == 4) {
+ parseSuccess = True;
+ fVideoWidth = (unsigned short)(x2 - x1);
+ fVideoHeight = (unsigned short)(y2 - y1);
+ }
+
+ return parseSuccess;
+}
+
Boolean MediaSubsession::parseSDPAttribute_x_dimensions(char const* sdpLine) {
// Check for a "a=x-dimensions:<width>,<height>" line:
Boolean parseSuccess = False;
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