linux-kernel - Re: [PATCH 1/3] ALSA: pcm: Add missing formats to formats list

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Date: Thu, 1 Feb 2024 09:54:39 +0100
From: Amadeusz Sławiński
 <amadeuszx.slawinski@...ux.intel.com>
To: Ivan Orlov <ivan.orlov0322@...il.com>, perex@...ex.cz, tiwai@...e.com
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ALSA: pcm: Add missing formats to formats list

On 1/31/2024 6:41 PM, Ivan Orlov wrote:
> On 1/26/24 09:01, Amadeusz Sławiński wrote:
>> On 1/25/2024 11:35 PM, Ivan Orlov wrote:
>>> Add 4 missing formats to 'snd_pcm_format_names' array in order to be
>>> able to get their names with 'snd_pcm_format_name' function.
>>>
>>> Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
>>> ---
>>>   sound/core/pcm.c | 4 ++++
>>>   1 file changed, 4 insertions(+)
>>>
>>> diff --git a/sound/core/pcm.c b/sound/core/pcm.c
>>> index a09f0154e6a7..d0788126cbab 100644
>>> --- a/sound/core/pcm.c
>>> +++ b/sound/core/pcm.c
>>> @@ -211,6 +211,10 @@ static const char * const snd_pcm_format_names[] 
>>> = {
>>>       FORMAT(DSD_U32_LE),
>>>       FORMAT(DSD_U16_BE),
>>>       FORMAT(DSD_U32_BE),
>>> +    FORMAT(S20_LE),
>>> +    FORMAT(S20_BE),
>>> +    FORMAT(U20_LE),
>>> +    FORMAT(U20_BE),
>>>   };
>>>   /**
>>
>> Maybe we can also add some kind of static_assert to check at compile 
>> time that all formats are handled, something like:
>> static_assert(ARRAY_SIZE(snd_pcm_format_names) == 
>> SNDRV_PCM_FORMAT_LAST + 1);
>>
>> Although looking at definitions there is a hole between 
>> SNDRV_PCM_FORMAT_U20_BE & SNDRV_PCM_FORMAT_SPECIAL, which will cause 
>> this idea to fail.
>>
>> Perhaps with comment:
>> static_assert(ARRAY_SIZE(snd_pcm_format_names) == 
>> SNDRV_PCM_FORMAT_LAST + 1 - 2); /* -2 for formats reserved for future 
>> use */
>> ?
> 
> Hi Amadeusz,
> 
> Thank you for the review and sorry for the late answer. Yes, I believe 
> it could be a nice improvement! Could I send a patch and specify you in 
> Suggested-by tag?
> 

Hi,

yes, go for it!

Amadeusz