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In USB Audio Class 2 (UAC2) setups, pitch control is handled by feedback endpoints. The host adjusts its data rate accordingly. When pitch control is active (pitch_elem), applying the default delay-locked loop (DLL) bandwidth can lead to instability and oscillations around the target rate. This patch adds a new parameter, api.alsa.dll-bandwidth-max, to configure the maximum DLL bandwidth. It introduces a new field in the ALSA state to store this value. By default, it uses SPA_DLL_BW_MAX, but when pitch control is in use, setting it to a lower value (e.g. 0.02) helps ensure better stability, based on empirical testing. |
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| .. | ||
| acp | ||
| mixer | ||
| 90-pipewire-alsa.rules | ||
| acp-tool.c | ||
| alsa-acp-device.c | ||
| alsa-compress-offload-device.c | ||
| alsa-compress-offload-sink.c | ||
| alsa-pcm-device.c | ||
| alsa-pcm-sink.c | ||
| alsa-pcm-source.c | ||
| alsa-pcm.c | ||
| alsa-pcm.h | ||
| alsa-seq-bridge.c | ||
| alsa-seq.c | ||
| alsa-seq.h | ||
| alsa-udev.c | ||
| alsa.c | ||
| alsa.h | ||
| compress-offload-api-util.c | ||
| compress-offload-api-util.h | ||
| compress-offload-api.c | ||
| compress-offload-api.h | ||
| meson.build | ||
| test-hw-params.c | ||
| test-timer.c | ||