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ALSA: usb-audio: Eliminate noise at the start of DSD playback. #340

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Merged
merged 1 commit into from
Feb 25, 2018
Merged

ALSA: usb-audio: Eliminate noise at the start of DSD playback. #340

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16 changes: 15 additions & 1 deletion sound/usb/endpoint.c
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Original file line number Diff line number Diff line change
Expand Up @@ -592,7 +592,21 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,

ep->datainterval = fmt->datainterval;
ep->stride = frame_bits >> 3;
ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0;

switch (pcm_format) {
case SNDRV_PCM_FORMAT_U8:
ep->silence_value = 0x80;
break;
case SNDRV_PCM_FORMAT_DSD_U8:
case SNDRV_PCM_FORMAT_DSD_U16_LE:
case SNDRV_PCM_FORMAT_DSD_U32_LE:
case SNDRV_PCM_FORMAT_DSD_U16_BE:
case SNDRV_PCM_FORMAT_DSD_U32_BE:
ep->silence_value = 0x69;
break;
default:
ep->silence_value = 0;
}

/* assume max. frequency is 25% higher than nominal */
ep->freqmax = ep->freqn + (ep->freqn >> 2);
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