[1/1] v4l2loopback: new package

This package provides a kernel module and utilities in order to use
v4l2loopback virtual devices.
This module allows you to create "virtual video devices" normal (v4l2)
applications will read these devices as if they were ordinary video
devices, but the video will not be read from e.g. a capture card but
instead it is generated by another application.

Signed-off-by: Alexandre Esse <alexandre.esse.dev@gmail.com>
---
 DEVELOPERS                             |  1 +
 package/Config.in                      |  1 +
 package/v4l2loopback/Config.in         | 23 +++++++++++++++++++++++
 package/v4l2loopback/v4l2loopback.hash |  2 ++
 package/v4l2loopback/v4l2loopback.mk   | 19 +++++++++++++++++++
 5 files changed, 46 insertions(+)
 create mode 100644 package/v4l2loopback/Config.in
 create mode 100644 package/v4l2loopback/v4l2loopback.hash
 create mode 100644 package/v4l2loopback/v4l2loopback.mk

Alexandre, All,

On 2017-06-19 22:51 +0200, Alexandre Esse spake thusly:
> This package provides a kernel module and utilities in order to use
> v4l2loopback virtual devices.
> This module allows you to create "virtual video devices" normal (v4l2)
> applications will read these devices as if they were ordinary video
> devices, but the video will not be read from e.g. a capture card but
> instead it is generated by another application.

Thank you for this contribution, it is very much interesting! :-)

See some comments below...

> Signed-off-by: Alexandre Esse <alexandre.esse.dev@gmail.com>
> ---
>  DEVELOPERS                             |  1 +
>  package/Config.in                      |  1 +
>  package/v4l2loopback/Config.in         | 23 +++++++++++++++++++++++
>  package/v4l2loopback/v4l2loopback.hash |  2 ++
>  package/v4l2loopback/v4l2loopback.mk   | 19 +++++++++++++++++++
>  5 files changed, 46 insertions(+)
>  create mode 100644 package/v4l2loopback/Config.in
>  create mode 100644 package/v4l2loopback/v4l2loopback.hash
>  create mode 100644 package/v4l2loopback/v4l2loopback.mk
> 
> diff --git a/DEVELOPERS b/DEVELOPERS
> index afc4596..c9f3559 100644
> --- a/DEVELOPERS
> +++ b/DEVELOPERS
> @@ -66,6 +66,7 @@ F:	package/tz/
>  
>  N:	Alexandre Esse <alexandre.esse.dev@gmail.com>
>  F:	package/kvazaar/
> +F:	package/v4l2loopback/
>  
>  N:	Alistair Francis <alistair.francis@xilinx.com>
>  F:	package/xen/
> diff --git a/package/Config.in b/package/Config.in
> index 9df0b42..db6c197 100644
> --- a/package/Config.in
> +++ b/package/Config.in
> @@ -49,6 +49,7 @@ menu "Audio and video applications"
>  	source "package/udpxy/Config.in"
>  	source "package/upmpdcli/Config.in"
>  	source "package/v4l2grab/Config.in"
> +	source "package/v4l2loopback/Config.in"
>  	source "package/vlc/Config.in"
>  	source "package/vorbis-tools/Config.in"
>  	source "package/wavpack/Config.in"
> diff --git a/package/v4l2loopback/Config.in b/package/v4l2loopback/Config.in
> new file mode 100644
> index 0000000..157bd20
> --- /dev/null
> +++ b/package/v4l2loopback/Config.in
> @@ -0,0 +1,23 @@
> +config BR2_PACKAGE_V4L2LOOPBACK
> +	bool "v4l2loopback"
> +	help
> +	  This module allows you to create "virtual video devices".
> +	  Normal (v4l2) applications will read these devices as if they
> +	  were ordinary video devices, but the video will not be read
> +	  from e.g. a capture card but instead it is generated by
> +	  another application.

So if I understand correctly, this is a kernel module, so you need to
depend on a kernel being built:

    depends on BR2_LINUX_KERNEL

> +if BR2_PACKAGE_V4L2LOOPBACK
> +
> +config BR2_PACKAGE_V4L2LOOPBACK_UTILS
> +	bool "v4l2loopback-utils"
> +	  select BR2_PACKAGE_BASH #runtine dependency
> +	  select BR2_PACKAGE_SUDO #runtime dependency

Spurious two-space after tab.

Besides, you can not select bash like that, because bash has
dependencies, so you need to propagate those dependencies:

    depends on BR2_USE_MMU # bash
    select BR2_PACKAGE_BUSYBOX_SHOW_OTHERS # bash
    select BR2_PACKAGE_BASH

See e.g. package/tovid/Config.in.

So, because it has requirements, you need to add a comment stating why
it may not be available:

    config BR2_PACKAGE_V4L2LOOPBACK
        bool "v4l2loopback"
        depends on BR2_LINUX_KERNEL
        help
          blablabla

    if BR2_PACKAGE_V4L2LOOPBACK

    config BR2_PACKAGE_V4L2LOOPBACK_UTILS
        bool "v4l2loopback-utils"
        depends on BR2_USE_MMU # bash
        select BR2_PACKAGE_BUSYBOX_SHOW_OTHERS # bash
        select BR2_PACKAGE_BASH

    endif

    comment "v4l2loopback needs a Linux kernel to be built"
        depends on !BR2_LINUX_KERNEL

> +	help
> +	  This package contains applications to interact with
> +	  v4l2-loopback devices ("virtual video devices").
> +	  Currently there is only a single command line utility:
> +	  v4l2loopback-ctl: tool to set framerate, format and timeout
> +	  image.
> +
> +endif
> diff --git a/package/v4l2loopback/v4l2loopback.hash b/package/v4l2loopback/v4l2loopback.hash
> new file mode 100644
> index 0000000..2b69fd7
> --- /dev/null
> +++ b/package/v4l2loopback/v4l2loopback.hash
> @@ -0,0 +1,2 @@
> +# Locally calculated
> +sha256 9bb1e8d544019bead20813877415ae974fbc22f87c69772984a4abac433f36dd  v4l2loopback-v0.10.0.tar.gz
> diff --git a/package/v4l2loopback/v4l2loopback.mk b/package/v4l2loopback/v4l2loopback.mk
> new file mode 100644
> index 0000000..2dec9c4
> --- /dev/null
> +++ b/package/v4l2loopback/v4l2loopback.mk
> @@ -0,0 +1,19 @@
> +################################################################################
> +#
> +# v4l2loopback
> +#
> +################################################################################
> +
> +V4L2LOOPBACK_VERSION = v0.10.0
> +V4L2LOOPBACK_SITE = $(call github,umlaeute,v4l2loopback,$(V4L2LOOPBACK_VERSION))
> +V4L2LOOPBACK_LICENSE = GPL-2.0

It is "version 2 of the License, or (at your option) any later version",
so: GPL-2.0+

Regards,
Yann E. MORIN.

> +V4L2LOOPBACK_LICENSE_FILES = COPYING
> +
> +ifeq ($(BR2_PACKAGE_V4L2LOOPBACK_UTILS),y)
> +define V4L2LOOPBACK_INSTALL_TARGET_CMDS
> +	$(INSTALL) -D -m 0755 $(@D)/utils/v4l2loopback-ctl $(TARGET_DIR)/usr/bin/v4l2loopback-ctl
> +endef
> +endif
> +
> +$(eval $(kernel-module))
> +$(eval $(generic-package))
> -- 
> 2.7.4
> 
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