Volume cannot control when hdmi connected in android 4.3

jasonhsu — Wed, 28 Jan 2015 01:30:33 GMT

Hi community,

Our customer found a bug that "Audio volume cannot be adjusted when connected to HDMI tv in android 4.3".

I have confirmed it is really as customer said. our model is based on sabreauto board.

even in Setting menu --> Sound, it cannot also ajust.

Could you give me some advices? thx a lot.

Re: Volume cannot control when hdmi connected in android 4.3

weidong_sun — Thu, 29 Jan 2015 04:47:34 GMT

Hello Jianhua,

We have a modification patch for android4.2.2 BSP, Even you are using android4.3 , you can also try to adjust source code according to the following suggestions:

------------------

Two modifications were needed to adjust hdmi volume:

“myandroid/hardware/libhardware_legacy/audio/AudioPolicyManagerBase.cpp”, function computeVolume()

From

// if volume is not 0 (not muted), force media volume to max on digital output

if (stream == AudioSystem::MUSIC &&

index != mStreams[stream].mIndexMin &&

(((device == AUDIO_DEVICE_OUT_AUX_DIGITAL) && (mDeviceIsHdmidongle == false)) ||

device == AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET ||

device == AUDIO_DEVICE_OUT_USB_ACCESSORY ||

device == AUDIO_DEVICE_OUT_USB_DEVICE)) {

return 1.0;

}

// if volume is not 0 (not muted), force media volume to max on digital output

if (stream == AudioSystem::MUSIC &&

index != mStreams[stream].mIndexMin &&

(device == AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET ||

device == AUDIO_DEVICE_OUT_USB_ACCESSORY ||

device == AUDIO_DEVICE_OUT_USB_DEVICE)) {

return 1.0;

}

“myandroid/frameworks/base/media/java/android/media/AudioService.java

From

if (SystemProperties.get("ro.product.device").contains("hdmidongle"))

mFixedVolumeDevices &= ~AudioSystem.DEVICE_OUT_AUX_DIGITAL;

-----------------------------------------------

Regards,

weidong

Re: Volume cannot control when hdmi connected in android 4.3

jasonhsu — Thu, 29 Jan 2015 08:13:56 GMT

Hi Weidong

Thx for your reply, this issue is fixed with your suggestion.:smileywink:

topic Re: Volume cannot control when hdmi connected in android 4.3 in i.MX Processors

Volume cannot control when hdmi connected in android 4.3

Re: Volume cannot control when hdmi connected in android 4.3

Re: Volume cannot control when hdmi connected in android 4.3