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

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Message-ID: <f882b666-8a68-4341-a143-cb226ab7d22b@linaro.org>
Date:   Mon, 23 Oct 2023 09:42:27 +0100
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

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


thanks,
--srini

>   	}
>   
>   	rc = q6apm_send_cmd_sync(graph->apm, pkt, 0);
> @@ -869,6 +874,11 @@ static int audioreach_set_compr_media_format(struct media_format *media_fmt_hdr,
>   		} else if (mcfg->num_channels == 2) {
>   			mp3_cfg->channel_mapping[0] =  PCM_CHANNEL_L;
>   			mp3_cfg->channel_mapping[1] =  PCM_CHANNEL_R;
> +		} else if (mcfg->num_channels == 4) {
> +			mp3_cfg->channel_mapping[0] =  PCM_CHANNEL_FL;
> +			mp3_cfg->channel_mapping[1] =  PCM_CHANNEL_FR;
> +			mp3_cfg->channel_mapping[2] =  PCM_CHANNEL_LS;
> +			mp3_cfg->channel_mapping[3] =  PCM_CHANNEL_RS;
>   		}
>   		break;
>   	case SND_AUDIOCODEC_AAC:
> @@ -1057,7 +1067,7 @@ static int audioreach_pcm_set_media_format(struct q6apm_graph *graph,
>   	int rc, payload_size;
>   	struct gpr_pkt *pkt;
>   
> -	if (num_channels > 2) {
> +	if (num_channels > 4) {
>   		dev_err(graph->dev, "Error: Invalid channels (%d)!\n", num_channels);
>   		return -EINVAL;
>   	}
> @@ -1094,7 +1104,11 @@ static int audioreach_pcm_set_media_format(struct q6apm_graph *graph,
>   	} else if (num_channels == 2) {
>   		media_cfg->channel_mapping[0] = PCM_CHANNEL_L;
>   		media_cfg->channel_mapping[1] = PCM_CHANNEL_R;
> -
> +	} else if (num_channels == 4) {
> +		media_cfg->channel_mapping[0] = PCM_CHANNEL_FL;
> +		media_cfg->channel_mapping[1] = PCM_CHANNEL_FR;
> +		media_cfg->channel_mapping[2] = PCM_CHANNEL_LS;
> +		media_cfg->channel_mapping[3] = PCM_CHANNEL_RS;
>   	}
>   
>   	rc = q6apm_send_cmd_sync(graph->apm, pkt, 0);
> @@ -1116,7 +1130,7 @@ static int audioreach_shmem_set_media_format(struct q6apm_graph *graph,
>   	struct gpr_pkt *pkt;
>   	void *p;
>   
> -	if (num_channels > 2) {
> +	if (num_channels > 4) {
>   		dev_err(graph->dev, "Error: Invalid channels (%d)!\n", num_channels);
>   		return -EINVAL;
>   	}
> @@ -1158,6 +1172,11 @@ static int audioreach_shmem_set_media_format(struct q6apm_graph *graph,
>   		else if (num_channels == 2) {
>   			cfg->channel_mapping[0] =  PCM_CHANNEL_L;
>   			cfg->channel_mapping[1] =  PCM_CHANNEL_R;
> +		} else if (num_channels == 4) {
> +			cfg->channel_mapping[0] =  PCM_CHANNEL_FL;
> +			cfg->channel_mapping[1] =  PCM_CHANNEL_FR;
> +			cfg->channel_mapping[2] =  PCM_CHANNEL_LS;
> +			cfg->channel_mapping[3] =  PCM_CHANNEL_RS;
>   		}
>   	} else {
>   		rc = audioreach_set_compr_media_format(header, p, mcfg);