[Guide] How to Make Viper4Android work on Lollipop - G2 General

Some people can't make viper4android work on the new Lollipop update so I'm doing a simple guide:
Requirements:
-Root
-Busybox
-Custom recovery
Installation:
1.- Deactivate NuPlayer in developer options.
2.- Deactivate any other equalizer.
3.- Set selinux to permissive with an app like this one https://play.google.com/store/apps/details?id=com.mrbimc.selinux&hl=en
4- Install through recovery the zip located below then reboot.
5.- Open viper4android and install the driver you want and then reboot.
6.- Done, enjoy high quality sound.

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these are the only versions of audio_effects and audio_policy i found that work with streaming apps. can you elaborate a bit more about them where did you find them or maybe you have an idea what was modified in them in order for streaming audio to work? thanks!

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Good job! But how can I increase the power of the speaker, like in KitKat using Mixer app, but in Lollipop?

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mannequin said:
these are the only versions of audio_effects and audio_policy i found that work with streaming apps. can you elaborate a bit more about them where did you find them or maybe you have an idea what was modified in them in order for streaming audio to work? thanks!
Click to expand...
Click to collapse
+1
I use those 2 files from the zip file to make v4a works for poweramp
My previous v4a installation only works on stock music & video player, now works for poweramp and mx player too.
Another note, disabling NUplayer not necessary for me...
Thanks again for this awesome guide :good:
Edit: I found using stock audio_policy.conf is possible to by remove this part:
Deep buffer
deep_buffer {
sampling_rates 44100|48000
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_SPEAKER|AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_WIRED_HEADSET|AUDIO_DEVICE_OUT_WIRED_HEADPHONE|AUDIO_DEVICE_OUT_ALL_SCO|AUDIO_DEVICE_OUT_AUX_DIGITAL|AUDIO_DEVICE_OUT_PROXY|AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET|AUDIO_DEVICE_OUT_FM|AUDIO_DEVICE_OUT_FM_TX
flags AUDIO_OUTPUT_FLAG_DEEP_BUFFER
}
Note: removing compress offload not necessary, as stated in dorimanx lp kernel thread. So removing deep buffer part only is enough.

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didhiy said:
Edit: I found using stock audio_policy.conf is possible to by removing this 2 sections:
Click to expand...
Click to collapse
do you mean just by removing these 2 sections stock audio_policy and audio_effects can be used instead?
btw, these two .conf files from OP zip break screen casting functionality of chromecast so i'm wondering if your solution will work.
edit: i think it does!

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Thanks so much, it really helped

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didhiy said:
+1
I use those 2 files from the zip file to make v4a works for poweramp
My previous v4a installation only works on stock music & video player, now works for poweramp and mx player too.
Another note, disabling NUplayer not necessary for me...
Thanks again for this awesome guide :good:
Edit: I found using stock audio_policy.conf is possible to by removing this 2 sections:
1. Compress offload
compress_offload {
sampling_rates 8000|11025|12000|16000|22050|24000|32000|44100|48000|64000|88200|96000|176400|192000
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_MP3|AUDIO_FORMAT_AAC|AUDIO_FORMAT_PCM_24_BIT_OFFLOAD
devices AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_SPEAKER|AUDIO_DEVICE_OUT_WIRED_HEADSET|AUDIO_DEVICE_OUT_WIRED_HEADPHONE
flags AUDIO_OUTPUT_FLAG_DIRECT|AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD|AUDIO_OUTPUT_FLAG_NON_BLOCKING
}
2. Deep buffer
deep_buffer {
sampling_rates 44100|48000
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_SPEAKER|AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_WIRED_HEADSET|AUDIO_DEVICE_OUT_WIRED_HEADPHONE|AUDIO_DEVICE_OUT_ALL_SCO|AUDIO_DEVICE_OUT_AUX_DIGITAL|AUDIO_DEVICE_OUT_PROXY|AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET|AUDIO_DEVICE_OUT_FM|AUDIO_DEVICE_OUT_FM_TX
flags AUDIO_OUTPUT_FLAG_DEEP_BUFFER
}
Click to expand...
Click to collapse
So, i've been having this huge problem on Nexus 7 2013 w\power amp and 5.1.1 cm12.1 and getting convolver and irs files to work properly.
two questions,
are your irs files working?
also, is the audio policy config on this thread flashable or pushable?

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masri1987 said:
So, i've been having this huge problem on Nexus 7 2013 w\power amp and 5.1.1 cm12.1 and getting convolver and irs files to work properly.
two questions,
are your irs files working?
also, is the audio policy config on this thread flashable or pushable?
Click to expand...
Click to collapse
No problem with irs & convolver on my D802, both working normally. I don't know for other devices.
The file from op is flashable from recovery. You can try that.
Just for comparison, I use other methods, I installing v4a manually then install the drivers from the app. Imho audio effect config will change when v4a installing driver. Most useful part from this thread for me only the audio policy config that solve my problem make other apps like poweramp work with v4a. Then I found that audio policy config from D802 stock rom can be use too by removing 2 parts. I believe this solution is better because I only lost 2 features from stock rom, not as much as the policy config from op.

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didhiy said:
No problem with irs & convolver on my D802, both working normally. I don't know for other devices.
The file from op is flashable from recovery. You can try that.
Just for comparison, I use other methods, I installing v4a manually then install the drivers from the app. Imho audio effect config will change when v4a installing driver. Most useful part from this thread for me only the audio policy config that solve my problem make other apps like poweramp work with v4a. Then I found that audio policy config from D802 stock rom can be use too by removing 2 parts. I believe this solution is better because I only lost 2 features from stock rom, not as much as the policy config from op.
Click to expand...
Click to collapse
Yeah, i flashed the file above and did everything properly, but IRS convolver files aren't exactly being 'used', not all irs files are working properly.
Should i be doing anything to the audio policy config file ? I use power amp too (although it did tell me it was processing under power amp),
IRS is crucial to me because i use my N7 2013 in my car as my in-dash.

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masri1987 said:
Yeah, i flashed the file above and did everything properly, but IRS convolver files aren't exactly being 'used', not all irs files are working properly.
Should i be doing anything to the audio policy config file ? I use power amp too (although it did tell me it was processing under power amp),
IRS is crucial to me because i use my N7 2013 in my car as my in-dash.
Click to expand...
Click to collapse
I think that's unrelated to the audio policy config thing, this thread already prove the way v4a working for D802. Solved the major problem why v4a only works for stock music & video player.
I suggest you to ask in the v4a main thread or maybe ask the dev that creates your favorite irs that didn't work. I only use 2 irs files & both working normally.

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this is kind of off topic but perhaps somebody is experiencing the same. i'm having a weird audio issue on LP which wasn't present on KK in any way and not V4A related.
no matter what the audio source is (playing mp3s or lossless, tons of EQ on or off, YouTube video, game, video, etc) there's a totally random, short sound corruption that sounds like garbled, sped up noise. it's impossible to trace any pattern when and why does it appear and perhaps it's related to radio since it tends to appear more when the signal is switching from Wi-Fi to cellular or cellular signal comes online, etc but not necessarily. i tried to look at the logs and don't see anything suspicious regarding sound there at all.
there's also a theory on other devices forums that Qualcomm's mpdecision is the cause since it always leaves only one core for the sound online and on LP apparently you need more. that doesn't seem right, however, since it does happen when the phone is doing a lot too and not just with the screen off.
any ideas are welcomed.

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mannequin said:
this is kind of off topic but perhaps somebody is experiencing the same. i'm having a weird audio issue on LP which wasn't present on KK in any way and not V4A related.
no matter what the audio source is (playing mp3s or lossless, tons of EQ on or off, YouTube video, game, video, etc) there's a totally random, short sound corruption that sounds like garbled, sped up noise. it's impossible to trace any pattern when and why does it appear and perhaps it's related to radio since it tends to appear more when the signal is switching from Wi-Fi to cellular or cellular signal comes online, etc but not necessarily. i tried to look at the logs and don't see anything suspicious regarding sound there at all.
there's also a theory on other devices forums that Qualcomm's mpdecision is the cause since it always leaves only one core for the sound online and on LP apparently you need more. that doesn't seem right, however, since it does happen when the phone is doing a lot too and not just with the screen off.
any ideas are welcomed.
Click to expand...
Click to collapse
You can try if the theory was right or wrong by temporary disabling mpdecision. I think the setting is in /mpt/enable file. Change the value from 1 to 0, than compared the results. Don't forget to enable it again by changing the value on that file back to 1. If still no different, I guess the theory was invalid.

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doesnt work for me I flashed the zip and then got "viper 4 Android stopped working" on Start, now I cannot install it in the normal way. Every Reboot that "viper 4 Android stopped working" thing comes and idk what to do

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didhiy said:
+1
I use those 2 files from the zip file to make v4a works for poweramp
My previous v4a installation only works on stock music & video player, now works for poweramp and mx player too.
Another note, disabling NUplayer not necessary for me...
Thanks again for this awesome guide :good:
Edit: I found using stock audio_policy.conf is possible to by removing this 2 sections:
1. Compress offload
compress_offload {
sampling_rates 8000|11025|12000|16000|22050|24000|32000|44100|48000|64000|88200|96000|176400|192000
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_MP3|AUDIO_FORMAT_AAC|AUDIO_FORMAT_PCM_24_BIT_OFFLOAD
devices AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_SPEAKER|AUDIO_DEVICE_OUT_WIRED_HEADSET|AUDIO_DEVICE_OUT_WIRED_HEADPHONE
flags AUDIO_OUTPUT_FLAG_DIRECT|AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD|AUDIO_OUTPUT_FLAG_NON_BLOCKING
}
2. Deep buffer
deep_buffer {
sampling_rates 44100|48000
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_SPEAKER|AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_WIRED_HEADSET|AUDIO_DEVICE_OUT_WIRED_HEADPHONE|AUDIO_DEVICE_OUT_ALL_SCO|AUDIO_DEVICE_OUT_AUX_DIGITAL|AUDIO_DEVICE_OUT_PROXY|AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET|AUDIO_DEVICE_OUT_FM|AUDIO_DEVICE_OUT_FM_TX
flags AUDIO_OUTPUT_FLAG_DEEP_BUFFER
}
Click to expand...
Click to collapse
OMG! thanks.

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mannequin said:
this is kind of off topic but perhaps somebody is experiencing the same. i'm having a weird audio issue on LP which wasn't present on KK in any way and not V4A related.
no matter what the audio source is (playing mp3s or lossless, tons of EQ on or off, YouTube video, game, video, etc) there's a totally random, short sound corruption that sounds like garbled, sped up noise. it's impossible to trace any pattern when and why does it appear and perhaps it's related to radio since it tends to appear more when the signal is switching from Wi-Fi to cellular or cellular signal comes online, etc but not necessarily. i tried to look at the logs and don't see anything suspicious regarding sound there at all.
there's also a theory on other devices forums that Qualcomm's mpdecision is the cause since it always leaves only one core for the sound online and on LP apparently you need more. that doesn't seem right, however, since it does happen when the phone is doing a lot too and not just with the screen off.
any ideas are welcomed.
Click to expand...
Click to collapse
Iam having the exact same issue also convolver are not working.

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gozzaa said:
Iam having the exact same issue also convolver are not working.
Click to expand...
Click to collapse
after much experimenting i can confirm that the only way to fix that issue is to always keep 2 or more CPU cores online, nothing else solves it at all.
with stock kernel the only option is to disable mpdecision and enable "multicore power saving" and "soc temperature throttle" for further heat control because without mpdecision you'll be keeping all 4 cores online.

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mannequin said:
after much experimenting i can confirm that the only way to fix that issue is to always keep 2 or more CPU cores online, nothing else solves it at all.
with stock kernel the only option is to disable mpdecision and enable "multicore power saving" and "soc temperature throttle" for further heat control because without mpdecision you'll be keeping all 4 cores online.
Click to expand...
Click to collapse
Ah i will try that, Iam using dorimanx.
Did you get convolvers to work? They dont have any effect for me. Also the effect of viper4android is very small on lollipop. I can hear a difference but its nothing compared to kitkat

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gozzaa said:
Ah i will try that, Iam using dorimanx.
Did you get convolvers to work? They dont have any effect for me. Also the effect of viper4android is very small on lollipop. I can hear a difference but its nothing compared to kitkat
Click to expand...
Click to collapse
I had someone trouble getting convolvers to work as well. Converting viper to a user app with titanium uninstalling the driver then reconverting it to a system app worked for me.

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Manbot27 said:
I had someone trouble getting convolvers to work as well. Converting viper to a user app with titanium uninstalling the driver then reconverting it to a system app worked for me.
Click to expand...
Click to collapse
after converting back to system app you install the drivers again or when its user app?
Edit: it worked! Iam using it as user app and its working flawless! Kudos to you

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gozzaa said:
Ah i will try that, Iam using dorimanx.
Did you get convolvers to work? They dont have any effect for me. Also the effect of viper4android is very small on lollipop. I can hear a difference but its nothing compared to kitkat
Click to expand...
Click to collapse
obviously using a custom kernel gives way more options to keep those 2 cores online in less destructive manner.
no problems with V4A here, everything works exactly like on KK. like mentioned above the key is to use it as a system app, modify selinux mode and edit audio policies files.