Re: [FFmpeg-devel] [PATCH] avdevice/alldevices: constify some function parameters

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

James Almer:
> Signed-off-by: James Almer <jamrial@gmail.com>
> ---
>  libavdevice/alldevices.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
> index fbbe187a51..3db489b83c 100644
> --- a/libavdevice/alldevices.c
> +++ b/libavdevice/alldevices.c
> @@ -68,7 +68,7 @@ void avdevice_register_all(void)
>      avpriv_register_devices(outdev_list, indev_list);
>  }
>  
> -static const void *next_input(const AVInputFormat *prev, AVClassCategory c2)
> +static const void *next_input(const AVInputFormat *prev, const AVClassCategory c2)
>  {
>      const AVClass *pc;
>      const AVClassCategory c1 = AV_CLASS_CATEGORY_DEVICE_INPUT;
> @@ -94,7 +94,7 @@ static const void *next_input(const AVInputFormat *prev, AVClassCategory c2)
>      return fmt;
>  }
>  
> -static const void *next_output(const AVOutputFormat *prev, AVClassCategory c2)
> +static const void *next_output(const AVOutputFormat *prev, const AVClassCategory c2)
>  {
>      const AVClass *pc;
>      const AVClassCategory c1 = AV_CLASS_CATEGORY_DEVICE_OUTPUT;
> 

AVClassCategory is an ordinary arithmetic type, not a pointer type; due
to call-by-value you can't change the caller's value at all. We
typically don't constify such parameters and doing so is highly unusual.
That being said, I am not against changing this policy.

- Andreas
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