linux-kernel - Re: [PATCH] ASoC: qcom: audioreach: Add 4 channel support

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Message-ID: <0cf0b5f0-165d-401a-a2ec-2fada4fdcebf@linaro.org>
Date:   Thu, 30 Nov 2023 12:24:30 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: qcom: audioreach: Add 4 channel support



On 30/11/2023 12:17, Krzysztof Kozlowski wrote:
> On 23/10/2023 10:42, Srinivas Kandagatla wrote:
>> Thanks for the patch,
>>
>> On 20/10/2023 09:49, Krzysztof Kozlowski wrote:
>>> Add support four channel streams.  Map channel 3 and 4 to left/right
>>> surround ("quad(side)" from ffmpeg standard channel list) to match what
>>> is in qdsp6/q6dsp-common.c driver.
>>>
>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>>
>>
>>> ---
>>>
>>> quad(side):
>>> https://trac.ffmpeg.org/wiki/AudioChannelManipulation#Listchannelnamesandstandardchannellayouts
>>> ---
>>>    sound/soc/qcom/qdsp6/audioreach.c | 25 ++++++++++++++++++++++---
>>>    1 file changed, 22 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/sound/soc/qcom/qdsp6/audioreach.c b/sound/soc/qcom/qdsp6/audioreach.c
>>> index 5974c7929dd3..4dd2a2e261c9 100644
>>> --- a/sound/soc/qcom/qdsp6/audioreach.c
>>> +++ b/sound/soc/qcom/qdsp6/audioreach.c
>>> @@ -833,6 +833,11 @@ static int audioreach_mfc_set_media_format(struct q6apm_graph *graph,
>>>    	} else if (num_channels == 2) {
>>>    		media_format->channel_mapping[0] = PCM_CHANNEL_L;
>>>    		media_format->channel_mapping[1] = PCM_CHANNEL_R;
>>> +	} else if (num_channels == 4) {
>>> +		media_format->channel_mapping[0] = PCM_CHANNEL_FL;
>>> +		media_format->channel_mapping[1] = PCM_CHANNEL_FR;
>>> +		media_format->channel_mapping[2] = PCM_CHANNEL_LS;
>>> +		media_format->channel_mapping[3] = PCM_CHANNEL_RS;
>>
>>
>> These are fine, but duplicated from q6dsp_map_channels(), Please
>> consider using q6dsp_map_channels().
>>
>> Also when you do that pl get rid of PCM_CHANNEL_L and PCM_CHANNEL_R
>> defines in audioreach.h
> 
> The code is not exactly equivalent, e.g. for one channel L (=1) -> FC
> (=3). I assume that's okay for you.
> 
Yep, that is okay for me.

--srini
> Best regards,
> Krzysztof
>