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alsa-util: Perform format and rate detection before setting HW params

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Perform detection of supported sample format and rates just after device is
opened, before `snd_pcm_hw_params()` is called for the first time. This fixes a
problem where device restricts available sample rates after HW params are set
preventing sample rate detection (seen with UAC2 devices and kernel 6.1.9)

Bug: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1414
Bug: https://github.com/alsa-project/alsa-lib/issues/119
Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/782>
This commit is contained in:
Igor V. Kovalenko 2023-02-22 01:19:24 +03:00 • committed by PulseAudio Marge Bot
parent b8e2198d34
commit aed52c507f
6 changed files with 46 additions and 12 deletions
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2
src/modules/alsa/alsa-ucm.c
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@ -2026,7 +2026,7 @@ static snd_pcm_t* mapping_open_pcm(pa_alsa_ucm_config *ucm, pa_alsa_mapping *m,
try_buffer_size = ucm->core->default_n_fragments * try_period_size;
pcm = pa_alsa_open_by_device_string(m->device_strings[0], NULL, &try_ss,
&try_map, mode, &try_period_size, &try_buffer_size, 0, NULL, NULL, exact_channels);
&try_map, mode, &try_period_size, &try_buffer_size, 0, NULL, NULL, NULL, NULL, exact_channels);
if (pcm) {
if (!exact_channels)