[alsa-devel] amixer: convert percentage into db wrongly

[Alan Horstmann]

On Friday 09 March 2012 11:33, Takashi Iwai wrote:
> The implementation isn't too hard.  I wrote a quick patch now as below.
> It became bigger than I thought since it contains many clean-ups that
> are needed to adapt the mapped volume.
>
> With the patch, amixer shows and reads the percent value with -M
> option just like in alsamixer.
>

<snip>

> --- a/amixer/amixer.c
> +++ b/amixer/amixer.c
> @@ -29,7 +29,9 @@
>  #include <assert.h>
>  #include <alsa/asoundlib.h>
>  #include <sys/poll.h>
> +#include <stdint.h>
>  #include "amixer.h"
> +#include "../alsamixer/volume_mapping.h"
>
>  #define LEVEL_BASIC		(1<<0)
>  #define LEVEL_INACTIVE		(1<<1)
> @@ -68,6 +70,8 @@ static int help(void)
>  	printf("  -i,--inactive   show also inactive controls\n");
>  	printf("  -a,--abstract L select abstraction level (none or basic)\n");
>  	printf("  -s,--stdin      Read and execute commands from stdin
> sequentially\n");
> +	printf("  -R,--raw-volume Use the raw value 
> (default)\n");
> +	printf("  -M,--mapped-volume Use the mapped volume\n");

A small comment...
What if both -R and -M are used?  Isn't -R equivalent to the absence of -M?  
Are both options necessary?

Regards

Alan