Hi Hans, Here is initial version of plugin support for libv4l, based on your RFC. It is provided by functions v4l2_plugin_[open,close,etc]. When open() is called libv4l dlopens files in /usr/lib/libv4l/plugins 1 at a time and call open() callback passing through the applications parameters unmodified. If a plugin is relevant for the specified device node, it can indicate so by returning a value other then -1 (the actual file descriptor). As soon as a plugin returns another value then -1 plugin loading stops and information about it (fd and corresponding library handle) is stored. For each function v4l2_[ioctl,read,close,etc] is called corresponding v4l2_plugin_* function which looks if there is loaded plugin for that file and call it's callbacks. v4l2_plugin_* functions indicate by their first argument if plugin was used, and if it was not then v4l2_* functions proceed with their usual behavior. Yordan Kamenov (1): Add plugin support to libv4l lib/include/libv4l2-plugin.h | 74 ++++++++ lib/include/libv4l2.h | 15 ++ lib/libv4l2/Makefile | 4 +- lib/libv4l2/libv4l2-priv.h | 9 + lib/libv4l2/libv4l2.c | 56 ++++++- lib/libv4l2/v4l2-plugin.c | 399 ++++++++++++++++++++++++++++++++++++++++++ lib/libv4l2/v4l2convert.c | 20 ++- 7 files changed, 568 insertions(+), 9 deletions(-) create mode 100644 lib/include/libv4l2-plugin.h create mode 100644 lib/libv4l2/v4l2-plugin.c -- 1.7.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
