Enable audio latency dump android auto

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Although a seasoned developer, I'm new to Android, and am wanting to develop an app to loop between user defineable sections of audio recorded via Android's mic in.

I'm wanting as low latency as possible when the loop point is hit i. As for sound file types I've never noticed much of a difference between any of them. I tend to stick with. Edit: Ahh I see, If you are wanting to play the whole audio file over and over you just need to call setLooping true like this:. If you are trying to play the full audio file once, then loop some small section of it over and over you can use the.

enable audio latency dump android auto

Learn more. Android audio looping Ask Question. Asked 9 years ago. Active 9 years ago. Viewed 6k times. I'm after some general recommendations such as: audio file format which classes should I be considering for playback e.

David David 21 1 1 silver badge 2 2 bronze badges. Active Oldest Votes. FoamyGuy FoamyGuy If I'm understanding this correctly, what this describes is a situation where the completion of R. I'd like to be able to instruct the playback object to resume playback from a specific point loop start in the file when a certain point loop end is reached- within the one soundfile.Many of us rely on our smartphones for all our media needs.

Now more than ever, we're using Bluetooth connections to play audio over speakers, headphones, car sound systems — the list goes on. If you own a Samsung smartphone like the Galaxy S9there are a number of Bluetooth tweaks and hidden tricks that can maximize your audio experience.

Most of these Bluetooth enhancements aren't enabled by default, so you'll have to get into your phone's settings to enable the features. Fortunately, the settings are relatively easy to access for the most part. We'll highlight the best ones below to help you get the most out of your Galaxy's Bluetooth feature.

Thanks to the revamped Quick Settings menu that arrived with Android Nougat, accessing Bluetooth settings on your Galaxy has never been easier. You're probably aware that tapping the Bluetooth icon here will quickly enable or disable the feature, but there are two other ways to interact with this toggle.

If you tap the word "Bluetooth" underneath the icon, the Quick Settings page will turn into a mini-menu where you can easily connect to Bluetooth devices. If you long-press the Bluetooth icon, on the other hand, you'll quickly jump to the full Bluetooth menu in your phone's settings, where you can perform a range of actions from pairing to adjusting existing Bluetooth connections. Though the Bluetooth Quick Settings tile is featured front and center within the menu itself, you have the added option of moving it to a more ideal location more tailored to your needs.

To move the Quick Settings tile, swipe down twice from the top edge of your screen to fully reveal Quick Settings, then tap on the menu button next to the settings cog and select "Button Order" from the popup. From there, simply drag and drop the Bluetooth Quick Settings tile to your preferred location within the menu, then tap on "Done" to confirm and exit. Media Volume Sync is an ingenious little setting found within your Galaxy device that lets you control the volume for your Bluetooth speaker or headphones straight from your phone, and vice versa.

This not only ensures that your paired devices stay on the same page as far as audio output goes, it also gives you the added ability to use one device to control volume whenever one is out of reach. Without this setting enabled, the volume buttons on your headphones will turn your headphones up or down, but the volume level of your phone's Bluetooth output will remain the same. This is particularly annoying when your phone is set to a low volume, because the headphone volume will never go high enough unless you raise the volume on your phone as well.

To enable this feature, pull up the Quick Settings menu on your Galaxy phone and long press on the Bluetooth icon to go to its settings page.

Measuring Audio Latency

Now, tap on the three-dot menu button and select "Media Volume Sync" from the popup. From there, simply hit the toggle close to the top of the page to turn the feature on. Note that your Bluetooth speaker or headphones must also support Media Volume Sync in order for the feature to work.

It's very simple to check for this — tap on the toggle as highlighted above, and if your headphones are incompatible, the toggle will automatically switch back off and inform you via prompt. One of the biggest hassles you'll encounter while enjoying media on your Bluetooth headphones or speakers is the audio interruptions from other apps.

Every time you get a notification, the music becomes almost inaudible for a few seconds. Thankfully, your Galaxy phone has you covered — it lets you isolate an app from all the others and play its audio exclusively over your Bluetooth speakers.

It's really an ingenious setting. The gist is that, while you're connected to Bluetooth speakers or headphones, only sound from one particular app will play over Bluetooth. The rest of your phone's audio will keep coming out of the built-in speakers as usual. To try it out, head to your phone's settings and tap on "Sounds and Vibration. Select this option, then tap on the toggle once you're in that page to turn the feature on. Tap on "Select" from the prompt that appears to finalize your selection.

It's now time to select which app you wish to play over your Bluetooth device, so either tap on the target app, or "Add application" to manually add it on, then select "Bluetooth device" to designate the app to your speaker or headphones. This is a great workaround for those notification interruptions I mentioned. All you have to do is select your favorite music app, then any sounds that your other apps make will come out of your device's speaker instead of interrupting the Bluetooth stream.

If you have two speakers that you'd like to pair to your Galaxy device and further boost the audio output within your home, you'll want to enable the Dual Audio setting within your phone to connect to another speaker or headphones. Note that Dual Audio requires a Galaxy model that supports Bluetooth 5 or higher, so that means you'll need a Galaxy S8, Galaxy Note 8, or newer model.

To try it out, head to the Bluetooth menu in Settings, then tap on the three-dot menu button and select "Dual audio. If you have Media volume sync enabled, a prompt will notify you that the feature must be disabled for dual pairing to work, so tap "Turn Off" to disable it.Audio Codecs play the most important role in the wireless audio experience as well as latency. If you are using expensive wireless earphones like Bose QC 35it is extremely important that they run at the best Audio Codec possible.

No way to customize or view the codecs available. So with the remaining macOS, Android, and Ubuntu, there is a workaround to change Bluetooth audio codec. A codec is a short form of Co ding and Dec oding. In case of wireless earphones, the audio signal is coded and then send to the earphones where it is decoded.

It has a healthy lossy sound compression, less-power consumption, and noticeable latency. However, there are ways to force the OS to use better Bluetooth codecs and get the best audio quality all the time. The most straight forward method is in Android.

Audio Debugging

Android devices are aptX and AAC compatible and will run at highest codec if your headphones are compatible. To force or change the Bluetooth codec first, you have to connect the headphones to your Android device. Next, start playing a song on your phone because this is the time the codec gets active. After that, head over to the Settings menu and move to Developer Options. Here, you will have different audio codecs to choose from.

The thing with Bluetooth audio codecs is that both the devices need to support the codec else no audio will be played. By default, the best audio codec will be selected. Android also provides other customizations for audio like Bluetooth audio sample rate or Bluetooth Audio Bits Per Sample. You can modify these settings but make sure that your headphones support the particular sample rate and bit streaming.

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If any other codec aside from SBC is available, Android will automatically show an available toggle for that particular codec. The approach in macOS is not as straight-forward as Android. Once you have the XCode tools downloaded, double-click on it and open the folder. Drag and drop this to the Applications folder. Once you place the Bluetooth Explorer app in the Applications folder, you can now access additional audio options.

Play an audio file because that only activates the Bluetooth Codec. To verify aptX is been used, hold down the Option key and click on the Bluetooth icon on the menu bar at the top-left. Under the Bluetooth menu, navigate to your wireless audio device connected and you will have a tray slide out.The "tee sink" is an AudioFlinger debugging feature, available in custom builds only, for retaining a short fragment of recent audio for later analysis.

This permits comparison between what was actually played or recorded vs.

ANDROID AUTO AUDIO VIDEO PLAYER

For privacy the tee sink is disabled by default, at both compile-time and run-time. To use the tee sink, you will need to enable it by re-compiling, and also by setting a property.

Be sure to disable this feature after you are done debugging; the tee sink should not be left enabled in production builds. The instructions in this section are for Android 7. For Android 5. Additionally, you must use a userdebug or eng build. If you use a userdebug build, then disable verity with:. The value of af. As noted above, the tee sink feature should not be left enabled. Restore your build and device as follows:.

enable audio latency dump android auto

All of these APIs are easy-to-use and well-understood, so they are pervasive throughout the Android platform. Nevertheless, there are some limitations to ALOGx and friends:. We will loosely use the term "media. A media. By convention, each thread should use it's own timeline. The diagram below shows the relationship of the mediaserver process and the init process, before media.

The diagram below shows the new relationship of the components, after media. As of Android 4. We encourage you to learn the new logging system for those occasions when it is indispensable. In particular, it is recommended for AudioFlinger threads that must run frequently, periodically, and without blocking such as the FastMixer and FastCapture threads.

In FastMixer and FastCapture threads, use code such as this:. For threads other than FastMixer and FastCapturethe thread's NBLog timeline can be used by both the thread itself, and by binder operations. NBLog::Writer does not provide any implicit mutual exclusion per timeline, so be sure that all logs occur within a context where the thread's mutex mLock is held. Caution: A separate NBLog::Writer timeline is required per thread, to ensure thread safety, since timelines omit mutexes by design.

If you want more than one thread to use the same timeline, you can protect with an existing mutex as described above for mLock. However, this negates a prime benefit of this API: its non-blocking behavior. It is active only when property ro.

You can enable it by:. You can manually request a log dump at any time. This command shows logs from all the active and recent timelines, and then clears them:. Now try killing mediaserver process: kill -9where is the process ID you noted earlier. You should see a dump from media. Content and code samples on this page are subject to the licenses described in the Content License. Overview Terminology Implementation. This article describes some tips and tricks for debugging Android audio.

Tee Sink The "tee sink" is an AudioFlinger debugging feature, available in custom builds only, for retaining a short fragment of recent audio for later analysis. Re-build libaudioflinger.Google serves cookies to analyze traffic to this site.

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Information about your use of our site is shared with Google for that purpose. See details. Over models supported. Even more coming soon.

Android Auto is compatible with the following vehicles. Android Auto is compatible with the following aftermarket stereos. Alfa Romeo. Aston Martin. Rapide Vanquish Vantage Aston Martin official site. Android Auto is coming soon in Bentley vehicles. Bentley official site. Android Auto is coming soon in BMW vehicles. BMW official site. Android Auto is coming soon in Dacia vehicles.

Dacia official site. Challenger Charger Durango Dodge official site. G70 G80 G90 Genesis official site. Daily Iveco official site. Revero Karma official site.Recording device activity over a short period of time is known as system tracing. System tracing produces a trace file that can be used to generate a system report. This report helps you identify how best to improve your app or game's performance. You can also inspect the details in recorded method traces, function traces, and system traces.

The System Tracing app is an Android tool that saves device activity to a trace file. On a device running an earlier version of Android, trace files are saved in the Systrace format. Systrace is a legacy platform-provided command-line tool that records device activity over a short period of time in a compressed text file.

The tool produces a report that combines data from the Android kernel, such as the CPU scheduler, disk activity, and app threads. It is a more general and sophisticated open-source tracing project for Android, Linux, and Chrome. It offers a superset of data sources compared to Systrace and allows you to record arbitrarily long traces in a protobuf-encoded binary stream. You can open these traces in the Perfetto UI. Figure 1.

enable audio latency dump android auto

A sample Perfetto trace view, which shows about 20 seconds of interaction with an app. Figure 2. Both reports provide an overall picture of an Android device's system processes for a given period of time. The report also inspects the captured tracing information to highlight problems that it observes, such as UI jank or high power consumption. Content and code samples on this page are subject to the licenses described in the Content License. App Basics. Build your first app. App resources.

Resource types. App manifest file. App permissions. Device compatibility.Also I hate manually editing HTML for long article with proper code tags and uploading images is a chore so I choose to put it here instead. It is quite critical in some kind of games.

enable audio latency dump android auto

Native Audio - Lower audio latency via OS's native audio library. Native Audio is a plugin that helps you easily loads and plays an audio using each platform's fastest native method… exceed7. You will learn about "native source" later how to get the fast one and various experiments like, what happen if we request too many.

They are not directly related to audio, but with these helper classes, you are able to use Java stuff from C without writing a single Java code. Which you will get to know them next.

The definition of SoundPool is so that you don't have to worry about underlying "native source" but rather a pool of sounds you want to use. One from many native sources will be selected and maintained automatically, instantiated more if not enough. Those native source are sometimes referrred as "stream". For example you play 3 different sounds quickly while having 2 sources, it will allocate you a new one. If you wait a bit and play the 4th sound and some earlier sound ended, SoundPool knows which one to reuse.

You can fine tune this by giving " priority " weight to each native source stream as well. It is ideal for example entering a level and you load all the possible sounds in that level to one pool. With Java AudioTrack if you want to do the same you will have to command the push and pull of audio data manually to change sounds.

That means a plethora of functions that Native Audio cannot do like setting play rate. Should you need to hack it to add or access other methods on SoundPoolyou won't have to write any native code or go compile a new. AAR package in Android Studio or something. It is not suitable for music. On the reason why Native Audio OpenSL ES is much more limited, setting sampling rate in terms of OpenSL ES means destroying the source and create a new ones with different rate which we absolutely cannot do for latency critical audio playing, while for SoundPool it is already there for you and it just works.

Moreover for OpenSL ES, just by having the set rate feature enabled and even not using it yet disqualify you from obtaining the fast audio mixer. So if you also want utility plus still less latency, try it. Design For Reduced Latency Android Open Source Project The fast mixer runs periodically, with a recommended period of two to three milliseconds msor a slightly higher… source. The following diagram shows the life… developer.

A very multimedia-ish player class for audio and video available in Java with sophisticated state machine. Just from this definition it is not for minimizing latency.


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