[Buildroot] [PATCH v6 09/16] package/opencv: add a choice for selecting gstreamer support

[Yann E. MORIN <yann.morin.1998@free.fr>]

Samuel, All,

On 2015-06-25 21:59 +0200, Samuel Martin spake thusly:
> OpenCV 3.0 support both gstreamer-0.10 and gstreamer-1.x, but only one
> is used at the time.
> 
> This patch turns the gstreamer support into a choice, in order to prepare
> adding the support for gstreamer-1 in a following patch.
> 
> Signed-off-by: Samuel Martin <s.martin49@gmail.com>
> 
> ---
> changes v5->v6:
> - new patch
> ---
>  package/opencv/Config.in | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/package/opencv/Config.in b/package/opencv/Config.in
> index 8ed505e..4b571e0 100644
> --- a/package/opencv/Config.in
> +++ b/package/opencv/Config.in
> @@ -177,18 +177,27 @@ config BR2_PACKAGE_OPENCV_WITH_FFMPEG
>  	help
>  	  Use ffmpeg from the target system.
>  
> +comment "gstreamer support needs a toolchain w/ wchar, threads"
> +	depends on BR2_USE_MMU
> +	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS

Although I don't like it much, we usually have the comment in the choice
itself, see for example the external toolchain choice.

> +choice
> +	prompt "gstreamer support"
> +	depends on BR2_USE_MMU # libglib2
> +	depends on BR2_USE_WCHAR # libglib2
> +	depends on BR2_TOOLCHAIN_HAS_THREADS # libglib2

So, this means the choice will not be visible when gstreamer is missing
its dependencies.

Instead, I'd do something like is done (in a later patch) for the GUI
toolkits, that is always show the choice, but hide whatever entries are
not available:

    choice
        bool "gstreamer support"

    config BR2_PKG_OCV_GST_NONE
        bool "none"

    config BR2_PKG_OCV_GST_0_10
        bool "gstreamer 0.10"
        depends on BR2_USE_MMU # gst-0.10
        depends on BR2_USE_WCHAR # gst-0.10
        depends on BR2_TOOLCHAIN_HAS_THREADS # gst-0.10

    comment "gst-0.10 support needs a toolchain w/ wxhar, threads"
        depends on BR2_USE_MMU
        depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS

    endchoice

Regards,
Yann E. MORIN.

> +config BR2_PACKAGE_OPENCV_WITHOUT_GSTREAMER
> +	bool "none"
> +
>  config BR2_PACKAGE_OPENCV_WITH_GSTREAMER
> -	bool "gstreamer support"
> -	depends on BR2_USE_MMU # gstreamer -> libglib2
> -	depends on BR2_USE_WCHAR # gstreamer -> libglib2
> -	depends on BR2_TOOLCHAIN_HAS_THREADS # gstreamer -> libglib2
> +	bool "gstreamer-0.10"
>  	select BR2_PACKAGE_GSTREAMER
>  	select BR2_PACKAGE_GST_PLUGINS_BASE
>  	select BR2_PACKAGE_GST_PLUGINS_BASE_PLUGIN_APP
>  
> -comment "gstreamer support needs a toolchain w/ wchar, threads"
> -	depends on BR2_USE_MMU
> -	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
> +
> +endchoice
>  
>  config BR2_PACKAGE_OPENCV_WITH_GTK
>  	bool "gtk support"
> -- 
> 2.4.4
> 
> _______________________________________________
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