![]() bypass-offload: changes an audio policy configuration file for bypassing USB & Bluetooth hardware offloading (worse in audio quality) and using a non- hardware offloading USB & Bluetooth audio driver (better in audio quality A small jitter USB driver and an AOSP Bluetooth driver without unnecessary resampling) while a 3.5mm jack and an internal speaker use a hardware offloading driver. Please unplug your headphones or earphones before executing a command for propagating this effect. drc: enables DRC (Dynamic Range Control, i.e., compression, typically sticking to all audio outputs on Qcomm devices) for the purpose of comparison to this script's usual DRC-less audio quality (not effective for -usb-only mode). reset(without arguments): resets its previous execution results. Their default values are 44k (sample rate: 44.1 kHz) and 32 (bit depth: 32 bits) except both safe and safest mode internal outputs (default values: 48 kHz, 32 or 16 bits). ![]() The arguments are a sample rate and a bit depth (or 32bit float) to which you want to change, respectively. If you unpack the archive under "/sdcard" (Internal Storage). Usage: sh /sdcard/USB_SampleRate_Changer/USB_SampleRate_Changer.sh ]],. ![]() The output frequency can be the same as the input one), so you need to be careful for resampling parameters even when resampling is not needed (see the description of "extras/change-resampling-quality.sh" below). (Note: some custom ROM's (not stocks and GSI's) intendedly invert or change the DRC mode on context, then this script cannot disable DRC)įinally, the Android OS mixer (AudioFlinger) always apply resampling even to 1:1 ratio pass-through (e.g., 44.1kHz to 44.1kHz resampling with Kaiser windowed digital low-pass filtering a resampler is consiting of an interpolator to the analogue space (limited analogue values needed only for the following sampler are computed) with an anti-aliasing low-pass filter and a digital sampler by a specified output frequency from the anlogue space to the digital one. For example, smart phones and tablets whose SoC's have an SDM? or SM? model number usually enable DRC on all audio outputs, but those whose SoC's have an MT? model number don't enable DRC on any audio output. This script signals the audioserver on the "global" mount name space to try to reload an audio policy configuration file generated by this script with a specified sample rate and bit depth, so the "root name space mount mode" change is needed.Īdditionally, this script disables DRC (Dynamic Range Control, i.e., a kind of compression) if DRC has been enabled on a stock firmware. Under Magisk environment ( "root name space mount mode" must be changed to "global" in the settings of Magisk Manager), this script changes the sample rate of the USB (including hardware offloading) audio class driver on Android devices on the fly like the developer setting of Bluetooth LDAC or the Windows mixer for avoiding annoying SRC (Sample Rate Conversion) distortion ultimately (i.e., not only the distortion of the OS mixer as usual, but also the over-sampling distortion in DAC's). This is not a Magisk module but a collection of root shell scripts using Magisk su or phh's SuperUser (uninstall "termux" and magisk modules replacing "toybox" and "busybox" commands if you've used them because they break the Adnroid standard and make this script work wrongly), and can be installed by just unpacking its ZIP archive on your Internal Storage ("/sdcard") or another. USB (including a 3.5mm jack and an internal speaker) sample rate changer for Android devices on the fly
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