Direct audio playback through ALSA - Xiaomi Redmi Note 3 Themes, Apps, and Mods

I'M NOT RESPONSIBLE FOR YOUR DEVICE! USE AT YOUR OWN RISK!
There is an app called AlsaPlayer which can play loseless FLAC/APE audio without using android's APIs.
You can read about the player and it's benefits in original thread: https://forum.xda-developers.com/general/general/hi-fi-playback-android-developers-t3011925
Source code with my changes: https://github.com/cerg2010cerg2010/alsaplayer
So I made it to work on our device, all you need is attached apk and a kernel that allows writing to "RX1 Mix Digital Volume" and "RX2 Mix Digital Volume" controls. For example, AGNi 12.9 doesn't allow us to do this, but the stock kernel from LokManSiu's repo works fine. I didn't tried the others.
_Currently_ playback works only with headphones. Also if you want to play mp3/aac/others with this player (without android of course), go to Settings -> Device name and choose (Compress1). This will utilze your codec instead of software decoding and reduce CPU usage and power consumption. Full list of formats supported by our device: https://github.com/rn3-los15/androi...oc/msm/qdsp6v2/msm-compress-q6-v2.c#L656-L667
And if you want to see or change your codec settings then find an app called "AlsaMixer" and use a patched kernel that workarounds errors when reading ALSA controls. You can find my "ALSA-friendly" kernel in attachment, it is based on LineageOS from LokManSiu. I'm also attached a patch with my changes.
If you are a random guy who wants this on your own device, there is a short info on cards.xml configuration:
First of all, you need your card name. You can get it from /proc/asound/cards. For example:
Code:
0 [msm8976tashalit]: msm8976-tashali - msm8976-tashalite-snd-card
msm8976-tashalite-snd-card
card name will be "msm8976-tashalite-snd-card".
Next thing is paths. You need to figure out how codec needs to be prepared. This info lies in mixer_paths.xml in /system/etc or /vendor/etc. Search for paths called "deep-buffer-playback", "low-latency-playback", "compress-offload-playback", etc. Put values from there to "device" section.
And a device number. See /proc/asound/pcm. Example:
Code:
00-09: (Compress1) : : playback 1
Device number is 9.
Volume is hard one because android changes it with software, so you can't see any difference when dumping control vars (at least in my case). Use AlsaMixer and guess...
This blog post can help you: https://arunraghavan.net/2016/01/audio-devices-and-configuration/

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Cool. Will try and report
---------- Post added at 12:56 AM ---------- Previous post was at 12:41 AM ----------
Couldn't play any format except for MP3.
What's the use of having a hi-res player if you can't play a hires file? I read from the original thread that flac and ape are supported but donno why mine doesn't.
Plus, the UI is nothing to write home about. I wouldn't use it even if it worked correctly. I hope you can design a better UI.
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Lol, this is a config issue... Maybe you need to change mixer_path in /sdcard/.alsaplayer/cards.xml. Can you please attach logcat & dmesg output? Which rom you are using?
And player design really looks bad, I'm not a professional designer but I can try to do something with that. Thanks for the report!

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cerg2010cerg2010 said:
Lol, this is a config issue... Maybe you need to change mixer_path in /sdcard/.alsaplayer/cards.xml. Can you please attach logcat & dmesg output? Which rom you are using?
And player design really looks bad, I'm not a professional designer but I can try to do something with that. Thanks for the report!
Click to expand...
Click to collapse
I took a logcat during using the app and trying to play a flac file (which leads go the error message). Then I rebooted the device so the dmesg would be smaller and easier to read. I hope the logs help

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mehrshad.shafaghi said:
I took a logcat during using the app and trying to play a flac file (which leads go the error message). Then I rebooted the device so the dmesg would be smaller and easier to read. I hope the logs help
Click to expand...
Click to collapse
Ok, I can't find something useful in logcat, except that you're playing a file from external sdcard, try to put it in internal storage. And I didn't mentioned that I don't need the boot dmesg, I need it after the initialization error happens. Thanks!

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Damn. **** got a bit complicated.
So this is what's happened: I played a 24/192 flac file from the SDcard, didn't play (no sound, to be percise. No error pop-up). Then I copied that file to the root of internal storage. It's working now.
Then I went back to it's original folder in SDcard, all of the files from that folder are also working now. But the other folders' flac files still don't work.
Btw, the player sometimes makes a cracking sound after you resume the song
P.S: I used the application after reboot and before taking the dmesg. However I can still take new ones without rebooting if you want
Update: It's crashing again. I've attached the logs

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mehrshad.shafaghi said:
Damn. **** got a bit complicated.
So this is what's happened: I played a 24/192 flac file from the SDcard, didn't play (no sound, to be percise. No error pop-up). Then I copied that file to the root of internal storage. It's working now.
Then I went back to it's original folder in SDcard, all of the files from that folder are also working now. But the other folders' flac files still don't work.
Btw, the player sometimes makes a cracking sound after you resume the song
P.S: I used the application after reboot and before taking the dmesg. However I can still take new ones without rebooting if you want
Update: It's crashing again. I've attached the logs
Click to expand...
Click to collapse
Hmm, that's strange... I though that was a permission issue (and maybe it is), but in dmesg I see a similar errors when I got headphone output not configured because of wrong path to mixer_paths.xml file, but in previous logcat it is read correctly (can't see anything related to it in new logcat because it's loaded when you start the player). Maybe Android is in conflict with the player? Try to select other device in settings, and choosing (Compress1) should fix the crackling sounds also.