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vi...@google.com
We have shared this with our product and engineering team and will update this issue with more information as it becomes available.
Description
Raising this issue to understand the logic in AvrcpVolumeManager.java.
When volume is changed on local device, audio module will set the volume to Bluetooth, in AvrcpVolumeManager.java, the volume will be sent to BT device, and also need to store it in SharedPreferences of Bluetooth. While, Bluetooth get the volume using mAudioManager.getLastAudibleStreamVolume(STREAM_MUSIC) for storing, other than use the "deviceVolume" provided by audio. Could you please help to understand the necessity of doing so?
/**
* Informs remote device of a system volume change and stores it.
*
* <p>See {@link #systemToAvrcpVolume}.
*
* @param deviceVolume in range (0 - {@code mDeviceMaxVolume}) received from system.
*/
void sendVolumeChanged(@NonNull BluetoothDevice device, int deviceVolume) {
if (deviceVolume == getVolume(device, -1)) {
d("sendVolumeChanged: Skipping update volume to same as current.");
return;
}
int avrcpVolume = systemToAvrcpVolume(deviceVolume);
mVolumeEventLogger.logd(
TAG,
"sendVolumeChanged:"
+ " device="
+ device
+ " avrcpVolume="
+ avrcpVolume
+ " deviceVolume="
+ deviceVolume
+ " mDeviceMaxVolume="
+ mDeviceMaxVolume);
mNativeInterface.sendVolumeChanged(device, avrcpVolume);
storeVolumeForDevice(device);
}
/**
* Retrieves system volume (0 - {@code mDeviceMaxVolume}) and calls {@link
* #storeVolumeForDevice(BluetoothDevice, int)} with {@code device}.
*/
synchronized void storeVolumeForDevice(@NonNull BluetoothDevice device) {
int storeVolume = mAudioManager.getLastAudibleStreamVolume(STREAM_MUSIC);
storeVolumeForDevice(device, storeVolume);
}
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