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From: GitHub issues - opened <github@alsa-project.org>
To: alsa-devel@alsa-project.org
Subject: missing sound on kernel-5.15
Date: Mon, 22 Aug 2022 08:45:50 +0200 (CEST)	[thread overview]
Message-ID: <20220822064550.B44A2F8026A@alsa1.perex.cz> (raw)
In-Reply-To: <1661150747490509987-webhooks-bot@alsa-project.org>

alsa-project/alsa-lib issue #264 was opened from chihhao-chen:

I am testing many types of headsets on Android platform with different kernel versions.

On kernel-5.10, calling sequence before playback is
snd_usb_hw_params -> set highest sampling rate, no SAMPLING_FREQ_CONTROL USB request in this stage
snd_pcm_release
snd_usb_hw_params -> set proper sampling rate, still no SAMPLING_FREQ_CONTROL USB request 
snd_usb_pcm_parepare -> in configure_endpoint SAMPLING_FREQ_CONTROL USB request  was sent

With the same calling sequence, a slightly behavior change on kernel-5.15 is
snd_usb_hw_params -> set highest sampling rate, SAMPLING_FREQ_CONTROL USB request  was sent
snd_pcm_release
snd_usb_hw_params -> set proper sampling rate, SAMPLING_FREQ_CONTROL USB request  was sent too
(because configure_endpoint was moved to snd_usb_hw_params function)
snd_usb_pcm_parepare -> no SAMPLING_FREQ_CONTROL USB request  because of USB EP flag check

I checked all USB packets and confirmed audio data output was correct.
But there may be missing sound problem for the first sound with many headsets (for example Samsung headset).
I found this issue is related to two-times sampling rate set request.
(I tried forcibly skip first USB request, everything became okay.)
So do you guys know why configure_endpoint was moved to snd_usb_hw_params?
Or could you provide patch for this problem?

Many thanks
Chihhao

Issue URL     : https://github.com/alsa-project/alsa-lib/issues/264
Repository URL: https://github.com/alsa-project/alsa-lib

       reply	other threads:[~2022-08-22  6:46 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1661150747490509987-webhooks-bot@alsa-project.org>
2022-08-22  6:45 ` GitHub issues - opened [this message]
2022-08-22  8:06 missing sound on kernel-5.15 chihhao chen
2022-08-22 11:57 ` Geraldo Nascimento
2022-08-29  7:56   ` chihhao chen
2022-08-29  8:06     ` Takashi Iwai
2022-08-29  8:50       ` chihhao chen
2022-08-29 12:16         ` Takashi Iwai
2022-08-29 18:15           ` Takashi Iwai
2022-08-30  5:54             ` Takashi Iwai
2022-08-30  6:02               ` Takashi Iwai
2022-08-30  6:13               ` chihhao chen
2022-08-30  7:02                 ` Takashi Iwai
2022-08-30  8:08                   ` chihhao chen
2022-08-30  8:24                     ` Takashi Iwai
2022-08-31  3:39                       ` chihhao chen
2022-08-31  5:18                         ` Takashi Iwai
2022-08-31  7:03                           ` chihhao chen
2022-08-31  8:04                             ` Takashi Iwai
2022-08-31  9:26                               ` chihhao chen
2022-08-31 10:48                                 ` Takashi Iwai
2022-08-31 13:16                                   ` chihhao chen
2022-08-31 13:40                                     ` Takashi Iwai
2022-09-01  5:50                                       ` chihhao chen
2022-09-01  7:51                                         ` Takashi Iwai
2022-09-01  8:28                                           ` Takashi Iwai
2022-09-01 10:06                                             ` chihhao chen
2022-09-01 10:25                                               ` Takashi Iwai
2022-11-11  7:58                                                 ` Chihhao Chen (陳志豪)

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