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

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Date:   Thu, 30 Nov 2023 13:17:18 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...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 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.

Best regards,
Krzysztof