Background
Android supports various audio files encoding and decoding.
I record audio into an audio file using android.media.MediaRecorder class, but I also wish to show information about the files I've recorded (not standard data, but still just text, maybe even configurable by user), and I think it's best to store this information within the files.
examples of possible data to store: when it was recorded, where it was recorded, notes by the user...
The problem
The MediaRecorder class doesn't have any function that I can find, to add or even read metadata of the recorded audio file.
I also can't find a similar class that does it.
What I've tried
I tried searching how to do it for specific files types, and also tried to find a library that does it.
I haven't find even a clue about this information.
The only thing I've found for MediaRecorder class, is a function called "setLocation" , which is used to indicate where the recording has started (geographically), and looking at its code, I can see it sets parameters:
public void setLocation(float latitude, float longitude) {
int latitudex10000 = (int) (latitude * 10000 + 0.5);
int longitudex10000 = (int) (longitude * 10000 + 0.5);
if (latitudex10000 > 900000 || latitudex10000 < -900000) {
String msg = "Latitude: " + latitude + " out of range.";
throw new IllegalArgumentException(msg);
}
if (longitudex10000 > 1800000 || longitudex10000 < -1800000) {
String msg = "Longitude: " + longitude + " out of range";
throw new IllegalArgumentException(msg);
}
setParameter("param-geotag-latitude=" + latitudex10000);
setParameter("param-geotag-longitude=" + longitudex10000);
}
But setParameter is private, and I'm not sure if it's ok to put anything I want into it, even if I had a way to access it (reflection, for example) :
private native void setParameter(String nameValuePair);
I also don't get, given an audio/video file, how to get/modify this kind of information. It's not available for SimpleExoPlayer, for example.
The questions
How can I read,write, and modify metadata inside supported audio files of Android?
Are there any limitations/restrictions for those actions?
Which file formats are available for this?
Is it possible to add the metadata while I record the audio?
Is it possible perhaps via MediaStore ? But then how do I do those operations? And which files are supported? And does the metadata stay within the file?
EDIT: ok I've looked at the solution offered to me (here, repo here, based on here) , and it seems to work well. However, it doesn't work on latest version of the library that it uses (org.mp4parser.isoparser:1.9.37 dependency of mp4parser) , so I leave this question to be answered : Why doesn't it work on latest version of this library?
Code:
object MediaMetaDataUtil {
interface PrepareBoxListener {
fun prepareBox(existingBox: Box?): Box
}
#WorkerThread
fun <T : Box> readMetadata(mediaFilePath: String, boxType: String): T? {
return try {
val isoFile = IsoFile(FileDataSourceImpl(FileInputStream(mediaFilePath).channel))
val nam = Path.getPath<T>(isoFile, "/moov[0]/udta[0]/meta[0]/ilst/$boxType")
isoFile.close()
nam
} catch (e: Exception) {
null
}
}
/**
* #param boxType the type of the box. Example is "©nam" (AppleNameBox.TYPE). More available here: https://kdenlive.org/en/project/adding-meta-data-to-mp4-video/
* #param listener used to prepare the existing or new box
* */
#WorkerThread
#Throws(IOException::class)
fun writeMetadata(mediaFilePath: String, boxType: String, listener: PrepareBoxListener) {
val videoFile = File(mediaFilePath)
if (!videoFile.exists()) {
throw FileNotFoundException("File $mediaFilePath not exists")
}
if (!videoFile.canWrite()) {
throw IllegalStateException("No write permissions to file $mediaFilePath")
}
val isoFile = IsoFile(mediaFilePath)
val moov = isoFile.getBoxes<MovieBox>(MovieBox::class.java)[0]
var freeBox = findFreeBox(moov)
val correctOffset = needsOffsetCorrection(isoFile)
val sizeBefore = moov.size
var offset: Long = 0
for (box in isoFile.boxes) {
if ("moov" == box.type) {
break
}
offset += box.size
}
// Create structure or just navigate to Apple List Box.
var userDataBox: UserDataBox? = Path.getPath(moov, "udta")
if (userDataBox == null) {
userDataBox = UserDataBox()
moov.addBox(userDataBox)
}
var metaBox: MetaBox? = Path.getPath(userDataBox, "meta")
if (metaBox == null) {
metaBox = MetaBox()
val hdlr = HandlerBox()
hdlr.handlerType = "mdir"
metaBox.addBox(hdlr)
userDataBox.addBox(metaBox)
}
var ilst: AppleItemListBox? = Path.getPath(metaBox, "ilst")
if (ilst == null) {
ilst = AppleItemListBox()
metaBox.addBox(ilst)
}
if (freeBox == null) {
freeBox = FreeBox(128 * 1024)
metaBox.addBox(freeBox)
}
// Got Apple List Box
var nam: Box? = Path.getPath(ilst, boxType)
nam = listener.prepareBox(nam)
ilst.addBox(nam)
var sizeAfter = moov.size
var diff = sizeAfter - sizeBefore
// This is the difference of before/after
// can we compensate by resizing a Free Box we have found?
if (freeBox.data.limit() > diff) {
// either shrink or grow!
freeBox.data = ByteBuffer.allocate((freeBox.data.limit() - diff).toInt())
sizeAfter = moov.size
diff = sizeAfter - sizeBefore
}
if (correctOffset && diff != 0L) {
correctChunkOffsets(moov, diff)
}
val baos = BetterByteArrayOutputStream()
moov.getBox(Channels.newChannel(baos))
isoFile.close()
val fc: FileChannel = if (diff != 0L) {
// this is not good: We have to insert bytes in the middle of the file
// and this costs time as it requires re-writing most of the file's data
splitFileAndInsert(videoFile, offset, sizeAfter - sizeBefore)
} else {
// simple overwrite of something with the file
RandomAccessFile(videoFile, "rw").channel
}
fc.position(offset)
fc.write(ByteBuffer.wrap(baos.buffer, 0, baos.size()))
fc.close()
}
#WorkerThread
#Throws(IOException::class)
fun splitFileAndInsert(f: File, pos: Long, length: Long): FileChannel {
val read = RandomAccessFile(f, "r").channel
val tmp = File.createTempFile("ChangeMetaData", "splitFileAndInsert")
val tmpWrite = RandomAccessFile(tmp, "rw").channel
read.position(pos)
tmpWrite.transferFrom(read, 0, read.size() - pos)
read.close()
val write = RandomAccessFile(f, "rw").channel
write.position(pos + length)
tmpWrite.position(0)
var transferred: Long = 0
while (true) {
transferred += tmpWrite.transferTo(0, tmpWrite.size() - transferred, write)
if (transferred == tmpWrite.size())
break
//System.out.println(transferred);
}
//System.out.println(transferred);
tmpWrite.close()
tmp.delete()
return write
}
#WorkerThread
private fun needsOffsetCorrection(isoFile: IsoFile): Boolean {
if (Path.getPath<Box>(isoFile, "moov[0]/mvex[0]") != null) {
// Fragmented files don't need a correction
return false
} else {
// no correction needed if mdat is before moov as insert into moov want change the offsets of mdat
for (box in isoFile.boxes) {
if ("moov" == box.type) {
return true
}
if ("mdat" == box.type) {
return false
}
}
throw RuntimeException("I need moov or mdat. Otherwise all this doesn't make sense")
}
}
#WorkerThread
private fun findFreeBox(c: Container): FreeBox? {
for (box in c.boxes) {
// System.err.println(box.type)
if (box is FreeBox)
return box
if (box is Container) {
val freeBox = findFreeBox(box as Container)
if (freeBox != null) {
return freeBox
}
}
}
return null
}
#WorkerThread
private fun correctChunkOffsets(movieBox: MovieBox, correction: Long) {
var chunkOffsetBoxes = Path.getPaths<ChunkOffsetBox>(movieBox as Box, "trak/mdia[0]/minf[0]/stbl[0]/stco[0]")
if (chunkOffsetBoxes.isEmpty())
chunkOffsetBoxes = Path.getPaths(movieBox as Box, "trak/mdia[0]/minf[0]/stbl[0]/st64[0]")
for (chunkOffsetBox in chunkOffsetBoxes) {
val cOffsets = chunkOffsetBox.chunkOffsets
for (i in cOffsets.indices)
cOffsets[i] += correction
}
}
private class BetterByteArrayOutputStream : ByteArrayOutputStream() {
val buffer: ByteArray
get() = buf
}
}
Sample usage for writing&reading title:
object MediaMetaData {
#JvmStatic
#Throws(IOException::class)
fun writeTitle(mediaFilePath: String, title: String) {
MediaMetaDataUtil.writeMetadata(mediaFilePath, AppleNameBox.TYPE, object : MediaMetaDataUtil.PrepareBoxListener {
override fun prepareBox(existingBox: Box?): Box {
var nam: AppleNameBox? = existingBox as AppleNameBox?
if (nam == null)
nam = AppleNameBox()
nam.dataCountry = 0
nam.dataLanguage = 0
nam.value = title
return nam
}
})
}
#JvmStatic
fun readTitle(mediaFilePath: String): String? {
return MediaMetaDataUtil.readMetadata<AppleNameBox>(mediaFilePath, AppleNameBox.TYPE)?.value
}
}
It seems there's no way to do it uniformly for all supported audio formats in Android. There are some limited options for particular formats though, so I suggest to stick with one format.
MP3 is the most popular one and there should be a lot of options like this one.
If you don't want to deal with encoding/decoding, there are some options for a WAV format.
There's also a way to add a metadata track to a MP4 container using MediaMuxer (you can have an audio-only MP4 file) or like this.
Regarding MediaStore: here's an example (at the end of page 318) on how to add metadata to it just after using MediaRecorder. Though as far as I know the data won't be recorded inside the file.
Update
I compiled an example app using this MP4 parser library and MediaRecorder example from SDK docs. It records an audio, puts it in MP4 container and adds String metadata like this:
MetaDataInsert cmd = new MetaDataInsert();
cmd.writeRandomMetadata(fileName, "lore ipsum tralalala");
Then on the next app launch this metadata is read and displayed:
MetaDataRead cmd = new MetaDataRead();
String text = cmd.read(fileName);
tv.setText(text);
Update #2
Regarding m4a file extension: m4a is just an alias for an mp4 file with AAC audio and has the same file format. So you can use my above example app and just change the file name from audiorecordtest.mp4 to audiorecordtest.m4a and change audio encoder from MediaRecorder.AudioEncoder.AMR_NB to MediaRecorder.AudioEncoder.AAC.
Related
I am building a photo vault where users can hide their photos.
I write the following code which traverses through all the directories (except the hidden one) and creates a report mentioning the number of images with directory name and file(images) path.
It works fine and does its job but the problem here is the amount of time it takes to execute.
I run it on my OnePlus 7T with 128 GB Storage and 52% used it takes almost 30-40 seconds to get all the images. That is an insane amount of time for a user to wait every time they want to add an image to the vault.
I want to know what optimization could be made here so that its speed gets optimized. I have tested other similar applications and they are doing it in a snap.
Please let me know if you can help.
#OptIn(ExperimentalTime::class)
private fun getFiles(): List<MyFileModel> {
val list = mutableListOf<MyFileModel>()
val time = measureTime {
Environment.getExternalStorageDirectory().listFiles()?.forEach {file->
if (file.isDirectory) {
openDirectory(file)
} else if (file.isImage) {
addImage(file)
Log.i(
TAG,
"getFiles: image: ${file.name}\nParent File: ${file.parentFile}\nParent: ${file.parent}"
)
}
}
}
Log.i(
TAG,
"getFiles: took ${time.inWholeHours}h : ${time.inWholeMinutes}m : ${time.inWholeSeconds}s"
)
map.keys.forEach {
Log.i(TAG, "getFiles: There are ${map[it]?.size} images in $it directory")
}
return listOf()
}
private fun addImage(file: File) {
val parentPath = file.parent ?: throw Exception("Could not add file as image. File: $file")
var folderName: String? = null
if (parentPath == FileUtils.ROOT_ADDRESS.path) {
folderName = "STORAGE"
//File is in the home directory
} else {
folderName = parentPath.substring(parentPath.lastIndexOf("/") + 1)
}
val files: MutableList<File>? = map[folderName]
if (files.isNullOrEmpty()) {
map[folderName] = mutableListOf(file)
} else {
files.addIfNotAlreadyAdded(file)
}
// Log.i(TAG, "addImage: map: $map")
}
//
private fun openDirectory(file: File) {
Log.i(TAG, "getFiles: FILE: ${file.absolutePath}")
if (file.isHidden) return
if (file.isImage) {
addImage(file)
return
}
if (file.isDirectory) {
file.listFiles()?.forEach {
Log.i(TAG, "openDirectory: file.listFiles().forEach : file: $it")
if (it.isImage) {
addImage(it)
}
if (it.isDirectory) {
openDirectory(it)
}
}
}
}
Here is the extensions function that checks if the file is an image or not.
val File.isImage: Boolean
get() {
val fileName = this.name
val lasIndexOfDot = fileName.lastIndexOf(".")
if (lasIndexOfDot == -1) {
//This means that the file got no extension
return false
}
val extension = fileName.substring(fileName.lastIndexOf(".") + 1).lowercase()
return extension.equals("png") ||
extension.equals("jpeg") ||
extension.equals("jpg") ||
extension.equals("gif")
}
Thank you :)
Finally, I was able to do that by implementing the Content Provider.
Going through all files and folders in the storage and then checking each file if it is an image or not and that too by looking at the file extension. It was a set of terrible ideas.
But in the end, this is how we learn. :)
I am a newbie to android coroutines my requirements
Need to upload 20 images
Keep track of upload(at least when it gets finished I need to hide progressBar of each image)
After uploading all the images need to enable a "next" button also
Here is my try:
private fun startUploading(){
// Get AWS data
val accessKey = sharedPreferences.getString(getString(R.string.aws_access_key), "").toString()
val secretKey = sharedPreferences.getString(getString(R.string.aws_secret_key), "").toString()
val bucketName = sharedPreferences.getString(getString(R.string.aws_bucket_name), "").toString()
val region = sharedPreferences.getString(getString(R.string.aws_region), "").toString()
val distributionUrl = sharedPreferences.getString(getString(R.string.aws_distribution_url), "").toString()
var totalImagesNeedToUpload = 0
var totalImagesUploaded = 0
CoroutineScope(Dispatchers.IO).launch {
for (i in allCapturedImages.indices) {
val allImageFiles = allCapturedImages[i].viewItem.ImageFiles
totalImagesNeedToUpload += allImageFiles.size
for (j in allImageFiles.indices) {
CoroutineScope(Dispatchers.IO).launch {
while (true) {
val internetActive = utilsClassInstance.hasInternetConnected()
if (internetActive){
try {
val file = allImageFiles[j]
if (!file.uploaded) {
// Upload the file
val cfUrl = utilsClassInstance.uploadFile(file.imageFile, accessKey, secretKey, bucketName, region, distributionUrl)
// Set the uploaded status to true
file.uploaded = true
file.uploadedUrl = cfUrl
// Increment the count of total uploaded images
totalImagesUploaded += 1
// Upload is done for that particular set image
CoroutineScope(Dispatchers.Main).launch {
mainRecyclerAdapter?.uploadCompleteForViewItemImage(i, j, cfUrl)
// Set the next button enabled
if (totalImagesUploaded == totalImagesNeedToUpload){
binding.btnNext.isEnabled = true
}
}
break
}else{
totalImagesUploaded += 1
break
}
} catch (e: Exception) {
println(e.printStackTrace())
}
}
}
CoroutineScope(Dispatchers.Main).launch {
if (totalImagesUploaded == totalImagesNeedToUpload){
updateProgressForAllImages()
binding.btnNext.isEnabled = true
}
}
}
}
}
}
}
fun uploadFile(file: File, accessKey:String, secretKey:String, bucketName: String, region:String, distributionUrl: String): String{
// Create a S3 client
val s3Client = AmazonS3Client(BasicAWSCredentials(accessKey, secretKey))
s3Client.setRegion(Region.getRegion(region))
// Create a put object
val por = PutObjectRequest(bucketName, file.name, file)
s3Client.putObject(por)
// Override the response headers
val override = ResponseHeaderOverrides()
override.contentType = "image/jpeg"
// Generate the url request
val urlRequest = GeneratePresignedUrlRequest(bucketName, file.name)
urlRequest.responseHeaders = override
// Get the generated url
val url = s3Client.generatePresignedUrl(urlRequest)
return url.toString().replace("https://${bucketName}.s3.amazonaws.com/", distributionUrl)
}
There are total "n" images that I need to upload
every image is getting uploaded in different Coroutine because I need to do the parallel upload
The whole question is how to know that all the images are uploaded and enable a next button?
Your code seems very unstructured. You have an infinite loop checking for network availability. You have a nested loop here to upload images (Why?). You are creating a lot of coroutine scopes and have no control over them
Based on the 3 requirements that you mentioned in the question, you can do something like this:
val imagesToUpload: List<File> = /* ... */
var filesUploaded = 0
lifecycleScope.launchWhenStarted {
coroutineScope { // This will return only when all child coroutines have finished
imagesToUpload.forEach { imageFile ->
launch { // Run every upload in parallel
val url = utilsClassInstance.uploadFile(file.imageFile, ...) // Assuming this is a non-blocking suspend function.
filesUploaded++
// Pass the `url` to your adapter to display the image
binding.progressBar.progress = (filesUploaded * 100) / imagesToUpload.size // Update progress bar
}
}
}
// All images have been uploaded at this point.
binding.btnNext.enabled = true
}
Ideally you should have used a viewModelScope and the upload code should be in a repository, but since you don't seem to have a proper architecture in place, I have used lifecycleScope which you can get inside an Activity or Fragment
I'm making an app where I play .mp3 files from the URL. I'm using the latest version of ExoPlayer 2.11.4.
What I need to do is get the total duration of the audio from the url so I can use it in my custom audio player.
The urls I'm using are of this type: https://myserver.net/.../audio/439688e0c3626d39d3ef3.mp3?token=6oz-22-2sa-9yh-7e-2iak
The problem is that sometimes my code works correctly most of the time and returns the correct duration. But sometimes what I get is a negative number: -9223372036854775807
And that doesn't allow my code to work properly. My code where I get the duration is this:
fun getDuration(url: String, context: Context) {
exoPlayer?.release()
exoPlayer = SimpleExoPlayer.Builder(context).build()
val dataSourceFactory = DefaultDataSourceFactory(context, Util.getUserAgent(context, "ExoPlayer"))
val mediaSource = ProgressiveMediaSource.Factory(dataSourceFactory).createMediaSource(Uri.parse(url))
exoPlayer?.prepare(mediaSource)
exoPlayer?.addListener(object : Player.EventListener {
override fun onPlayerStateChanged(playWhenReady: Boolean, playbackState: Int) {
if (playbackState == ExoPlayer.STATE_READY) {
val realDurationMillis: Long? = exoPlayer?.getDuration()
currentDuration = realDurationMillis
if (currentDuration != null) {
if (currentDuration!! > 0) {
exoPlayer?.release()
}
}
}
}
})
}
C.TIME_UNSET is defined as Long.MIN_VALUE + 1 which is where your -9223372036854775807 comes from.
/**
* Special constant representing an unset or unknown time or duration. Suitable for use in any
* time base.
*/
public static final long TIME_UNSET = Long.MIN_VALUE + 1;
I'm having issues finding a solution to saving a FloatArray buffer of audio data produced from TarsosDSP on Android, using Kotlin. The goal is to have a buffer of 1 second of audio, that is continuously updated with new buffer data, and older data discarded. I wish to save this buffer when requested.
I've tried to find a solution using the TarsosDSP library, but it want to write a continuous stream to a wav file; I need it limited to only one second, and have saved on demand. This WavFileWriter looked promising -> https://github.com/philburk/jsyn/blob/master/src/com/jsyn/util/WaveFileWriter.java but as I had added it to my android project, javax was needed. I didn't know until looking up what javax was, and it was not supported in android. Trying to find a library that could solve this issue turned up with little results.
private val SAMPLE_RATE = 16000
private val BUFFER_SIZE = 1024
private val SECONDS = 1.0
private val sampleFileName: String = "audio_sample.wav"
private var audioBuffer = FloatArray(SAMPLE_RATE * SECONDS.toInt())
private var dispatcher =
AudioDispatcherFactory.fromDefaultMicrophone(SAMPLE_RATE, BUFFER_SIZE, 128)
init {
blankProcessor = object : AudioProcessor {
override fun processingFinished() {}
override fun process(audioEvent: AudioEvent): Boolean {
var buffer = audioEvent.floatBuffer
val insertPoint = audioBuffer.lastIndex - buffer.lastIndex
Arrays.copyOfRange(audioBuffer, insertPoint, audioBuffer.size)
.copyInto(audioBuffer, 0)
buffer.copyInto(audioBuffer, insertPoint)
return true
}
}
dispatcher.addAudioProcessor(blankProcessor)
audioThread = Thread(dispatcher, "Audio Thread")
}
private fun writeWavFile() {
val file = File(context.cacheDir.absolutePath + "/" + sampleFileName)
// missing wav write code
}
TarsosDSP offers the WriterProcessor class, for writing audio to file:
https://github.com/JorenSix/TarsosDSP/blob/c26e5004e203ee79be1ec25c2603b1f11b69d276/src/core/be/tarsos/dsp/writer/WriterProcessor.java
Here's your modified example:
private var dispatcher =
AudioDispatcherFactory.fromDefaultMicrophone(SAMPLE_RATE, BUFFER_SIZE, 128)
init {
blankProcessor = object : AudioProcessor {
override fun processingFinished() {}
override fun process(audioEvent: AudioEvent): Boolean {
var buffer = audioEvent.floatBuffer
val insertPoint = audioBuffer.lastIndex - buffer.lastIndex
Arrays.copyOfRange(audioBuffer, insertPoint, audioBuffer.size)
.copyInto(audioBuffer, 0)
buffer.copyInto(audioBuffer, insertPoint)
return true
}
}
dispatcher.addAudioProcessor(blankProcessor)
// The important bit
val outputFile = File(context.filesDir, "file_name")
val randomAccessFile = RandomAccessFile(outputFile, "rw")
val fileWriter = WriterProcessor(audioFormat, randomAccessFile)
dispatcher.addAudioProcessor(fileWriter)
audioThread = Thread(dispatcher, "Audio Thread")
}
I am not a fan of polling for information and suspect there is a better way of achieveing what I want.
I am playing an internet radio stream with Android's MediaPlayer. I can find out which tune is playing and by which artist by requesting the 7.html file at the server's address.
My questions are:
Is there a way to receive a notification when a new song begins
to play?
Must I poll the 7.html to find out what is now playing?
If I do have to poll, is there any way in which I can determine
the duration of the current song so I can poll only when a new song
starts?
I guess if I had a low-level stream processing function of my own, I could tell when the song changes because I would receive the meta-data, but I'm not sure how to do that with the Android MediaPlayer class.
Haha, seven years after commenting I finally had to implement this :-D I want a tumbleweed badge for this ;-)
Not to my knowledge
Yes
Not to my knowledge, but polling timers between 30-60 seconds should be fine. At the beginning I wanted to reduce network traffic for users, but this is irrelevant if you are streaming radio at the same time :-D
And here my quick and dirty solution, just in case someone needs it. There are some custom classes in the example, but you ll get the point
import androidx.core.text.HtmlCompat
import de.jahpress.android.main.L
import de.jahpress.android.main.MAX_REQUEST_FOR_SHOUTCAST_TRACK_INFO
import de.jahpress.android.service.Data
import de.jahpress.android.service.radio.model.BaseStation
import okhttp3.OkHttpClient
import okhttp3.Request
import java.util.*
import java.util.concurrent.TimeUnit
import kotlin.concurrent.thread
class ShoutCastTrackInfoManager {
private val timeOut = 5L
private val pollingIntervalMs = 60_000L
private var updateTimer: Timer? = null
private var trackInfoThread: Thread? = null
private var invalidTrackInfoCounter = 0
//will ask track info only one time (select station in my use case)
fun updateTrackInfoFor(station: BaseStation, resultCallback: (info: String?) -> Unit) {
L.d("TrackInfo: Get title info for ${station.getStationName()}")
invalidTrackInfoCounter = 0
stopTrackInfoPolling()
requestTrackInfoFromShoutcast(station, resultCallback)
}
//will start track info polling (if station is playing)
fun startTrackInfoPolling(station: BaseStation) {
L.d("TrackInfo: Get title info for ${station.getStationName()}")
stopTrackInfoPolling()
updateTimer = Timer()
updateTimer?.schedule(object : TimerTask() {
override fun run() {
requestTrackInfoFromShoutcast(station, null)
}
}, 0, pollingIntervalMs)
}
fun stopTrackInfoPolling() {
trackInfoThread?.let {
L.d("TrackInfo: Stopping current title update for stream")
it.interrupt()
}
updateTimer?.cancel()
}
private fun requestTrackInfoFromShoutcast(
station: BaseStation,
resultCallback: ((info: String?) -> Unit)?
) {
if (invalidTrackInfoCounter >= MAX_REQUEST_FOR_SHOUTCAST_TRACK_INFO) {
L.d("TrackInfo: $MAX_REQUEST_FOR_SHOUTCAST_TRACK_INFO invalid stream titles. Sto...")
invalidTrackInfoCounter = 0
stopTrackInfoPolling()
Data.currentTitleInfo = null //reset track info
return
}
trackInfoThread = thread {
try {
var trackInfo: String? = null
get7HtmlFromStream(station)?.let {
L.d("TrackInfo: Request track info at $it")
val request = Request.Builder().url(it).build()
val okHttpClient = OkHttpClient.Builder()
.connectTimeout(timeOut, TimeUnit.SECONDS)
.writeTimeout(timeOut, TimeUnit.SECONDS)
.readTimeout(timeOut, TimeUnit.SECONDS)
.build()
val response = okHttpClient.newCall(request).execute()
if (response.isSuccessful) {
val result = response.body?.string()
trackInfo = extractTrackInfoFrom7Html(result)
if (trackInfo != null) {
Data.currentTitleInfo = trackInfo
}
}
response.close()
}
resultCallback?.invoke(trackInfo)
} catch (e: Exception) {
L.e(e)
resultCallback?.invoke(null)
stopTrackInfoPolling()
}
}
}
/**
* Will create Shoutcast 7.html which is located at stream url.
*
* For example: http://66.55.145.43:7473/stream
* 7.html at http://66.55.145.43:7473/7.html
*/
private fun get7HtmlFromStream(station: BaseStation): String? {
val baseStreamUrl = station.getStreamUrl()
L.w("Base url -> $baseStreamUrl")
if (baseStreamUrl == null) return null
val numberSlash = baseStreamUrl.count { c -> c == '/' }
if (numberSlash <= 2) {
return "$baseStreamUrl/7.html"
}
val startOfPath = station.getStreamUrl().indexOf("/", 8)
val streamUrl = station.getStreamUrl().subSequence(0, startOfPath)
return "$streamUrl/7.html"
}
/**
* Will convert webpage to trackinfo. Therefore
* 1. Remove all html-tags
* 2. Get <body> content of webpage
* 3. Extract and return trackinfo
*
* Trackinfo format is always like
* "632,1,1943,2000,439,128,Various Artists - Dance to Dancehall"
* so method will return everything after sixth "," comma character.
*
* Important:
* - Shoutcast might return invalid html
* - Site will return 404 error strings
* - might be empty
*/
private fun extractTrackInfoFrom7Html(html: String?): String? {
L.i("Extract track info from -> $html")
if (html == null) return null
val content = HtmlCompat.fromHtml(html, HtmlCompat.FROM_HTML_MODE_COMPACT).toString()
val array = content.split(",")
return if (array.size < 7) {
null
} else {
var combinedTrackInfo = ""
for (index in 6 until array.size) {
combinedTrackInfo += "${array[index]} "
}
if (combinedTrackInfo.trim().isEmpty()) {
return null
}
return combinedTrackInfo
}
}
}