And here's the driver for host-mode USB audio accessories (Android Open Accessory). Here's a link to the audio HAL implementation at the CodeAurora Forum, which serves as the sort-of reference implementation for a lot of Qualcomm's platforms. So the information is available if you want to avoid having the audio HAL hardcoding the card/device numbers for USB audio accessories (but I suspect that there are implementations that simply assume card 1 for USB audio accessories). On those platforms, the ALSA card/device number of the USB audio accessory would be picked up by the WiredAccessoryManager (or the UsbDeviceManager in the case of host-mode accessories) (this is in the Java layers of Android). I'm not saying that it's a good idea to hardcode card and device numbers - just that it's usually not going to be a real problem in practice. In the Device Manager page, you will find all type of drivers and peripherals. To open it you can search for it on the Windows search bar. This method works because the problem only occurs if the device-specific driver replaces the default. Windows now selects the device-specific driver instead of the default USB audio 2.0 driver. Make sure to select all the options under the Select Additional Tasks section. Next, download the AudioRelay app on your Windows PC, then run the installer and click Next. Make sure your Android phone and PC are connected to the same Wi-Fi network. Copy the driver to your PC and extract the zip file. If the device isnt yet connected, install the device-specific driver first by using the installer for the device. Follow the steps below to turn your Android phone into a wireless speaker. On the platforms I've worked with, all audio devices except for USB were located on card 0. Download the Asus USB Driver from the links in the download section. does this mean it can not support multi-devicesįurther more, I would really appreciate if you could share me a piece of source code for more information(for instance ,other drivers.) Why it always uses Card 0 and device 0. =>linux-3.5.4/device/samsung/crespo/libaudio/AudioHardware.cpp status_t AudioHardware::AudioStreamInALSA::open_l() How can user application handle these devices correctly. ├── pcmC1D0p //new card,new playback channel ├── pcmC1D0c //new card,new capture channel However, there is a problem.If there is only one audio devices,it is fine /dev/snd/īut ,if there is more than one device(for instance,when I plug in a usb audio device). By writing custom USB audio code, pro audio is now finally possible on millions of Android devices. The driver will identify in device manager as 'USB. The driver is named: usbaudio2.sys and the associated inf file is usbaudio2.inf. The driver is a WaveRT audio port class miniport. Its designed to support the USB Audio 2.0 device class. User space application uses /dev/snd/pcmXXXXX to play/capture audio data. Starting with Windows 10, release 1703, a USB Audio 2.0 driver is shipped with Windows. And I studied audio driver of Samsung Devices. Recently ,I am trying to develop a alsa driver for Linux(actually ,Android TV).I came across a problem about alsa(alsa refers to Advanced Linux Sound Architecture) devices handlingĪctually ,I have studied part of source code of alsa-lib-1.0.27.1, and tinyalsa(for android devices).
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