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Improve metrics collector (#644)
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Co-authored-by: Gaëtan Muller <[email protected]>
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@StaehliJ @MGaetan89
StaehliJ and MGaetan89 committed Jul 29, 2024
1 parent 62b0ec7 commit f957313
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254 changes: 110 additions & 144 deletions ...box-player/src/main/java/ch/srgssr/pillarbox/player/analytics/metrics/MetricsCollector.kt
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Expand Up @@ -5,25 +5,21 @@
package ch.srgssr.pillarbox.player.analytics.metrics

import androidx.annotation.VisibleForTesting
import androidx.media3.common.C
import androidx.media3.common.Format
import androidx.media3.common.Player
import androidx.media3.common.Timeline.Window
import androidx.media3.common.util.Size
import androidx.media3.exoplayer.DecoderCounters
import androidx.media3.exoplayer.DecoderReuseEvaluation
import androidx.media3.exoplayer.analytics.AnalyticsListener
import androidx.media3.exoplayer.analytics.AnalyticsListener.EventTime
import androidx.media3.exoplayer.drm.DrmSession
import androidx.media3.exoplayer.source.LoadEventInfo
import androidx.media3.exoplayer.source.MediaLoadData
import ch.srgssr.pillarbox.player.PillarboxExoPlayer
import ch.srgssr.pillarbox.player.analytics.PillarboxAnalyticsListener
import ch.srgssr.pillarbox.player.analytics.PlaybackSessionManager
import ch.srgssr.pillarbox.player.analytics.TotalPlaytimeCounter
import ch.srgssr.pillarbox.player.analytics.extension.getUidOfPeriod
import ch.srgssr.pillarbox.player.source.PillarboxMediaSource
import ch.srgssr.pillarbox.player.utils.DebugLogger
import kotlin.time.Duration
import kotlin.time.Duration.Companion.milliseconds

/**
* Playback stats metrics
Expand Down Expand Up @@ -51,19 +47,12 @@ class MetricsCollector @VisibleForTesting private constructor(
fun onMetricSessionReady(metrics: PlaybackMetrics) = Unit
}

private val totalPlaytimeCounter: TotalPlaytimeCounter = TotalPlaytimeCounter(timeProvider)
private val totalStallTimeCounter: TotalPlaytimeCounter = TotalPlaytimeCounter(timeProvider)
private val totalBufferingTimeCounter: TotalPlaytimeCounter = TotalPlaytimeCounter(timeProvider)
private var stallCount = 0
private var bandwidth = 0L
private var bufferDuration = Duration.ZERO
private var audioFormat: Format? = null
private var videoFormat: Format? = null
private val window = Window()
private val loadingTimes = mutableMapOf<Any, LoadingTimes>()
private var currentSession: PlaybackSessionManager.Session? = null
private val listeners = mutableSetOf<Listener>()
private lateinit var player: PillarboxExoPlayer
private val metricsSessions = mutableMapOf<Any, SessionMetrics>()
private var surfaceSize: Size = Size.UNKNOWN

constructor() : this({ System.currentTimeMillis() })

Expand Down Expand Up @@ -94,181 +83,151 @@ class MetricsCollector @VisibleForTesting private constructor(
listeners.remove(listener)
}

private fun notifyMetricsFinished(metrics: PlaybackMetrics) {
private fun notifyMetricsFinished(playbackMetrics: PlaybackMetrics) {
DebugLogger.debug(TAG, "notifyMetricsFinished $playbackMetrics")
listeners.toList().forEach {
it.onMetricSessionFinished(metrics)
it.onMetricSessionFinished(playbackMetrics)
}
}

private fun notifyMetricsReady(metrics: PlaybackMetrics) {
if (currentSession?.sessionId != metrics.sessionId) return
DebugLogger.debug(TAG, "notifyMetricsReady $metrics")
private fun notifyMetricsReady(playbackMetrics: PlaybackMetrics) {
if (currentSession?.sessionId != playbackMetrics.sessionId) return
DebugLogger.debug(TAG, "notifyMetricsReady $playbackMetrics")
listeners.toList().forEach {
it.onMetricSessionReady(metrics)
it.onMetricSessionReady(metrics = playbackMetrics)
}
}

override fun onSessionCreated(session: PlaybackSessionManager.Session) {
getOrCreateLoadingTimes(session.periodUid)
getOrCreateSessionMetrics(session.periodUid)
}

override fun onSessionFinished(session: PlaybackSessionManager.Session) {
getMetricsForSession(session)?.let {
DebugLogger.debug(TAG, "onSessionFinished: $it")
notifyMetricsFinished(it)
metricsSessions.remove(session.periodUid)?.let {
notifyMetricsFinished(createPlaybackMetrics(session = session, metrics = it))
}
if (currentSession == session) {
currentSession = null
}
loadingTimes.remove(session.periodUid)
reset()
}

override fun onCurrentSession(session: PlaybackSessionManager.Session) {
currentSession = session
val loadingTimes = loadingTimes[session.periodUid]
if (loadingTimes?.state == Player.STATE_READY) {
getCurrentMetrics()?.let(this::notifyMetricsReady)
getOrCreateSessionMetrics(session.periodUid).apply {
setIsPlaying(player.isPlaying)
setPlaybackState(player.playbackState)
}
}

private fun getOrCreateLoadingTimes(periodUid: Any): LoadingTimes {
return loadingTimes.getOrPut(periodUid) {
LoadingTimes(timeProvider = timeProvider, onLoadingReady = {
/**
* Get session metrics
*
* @param eventTime
* @return `null` if there is no item in the timeline
*/
private fun getSessionMetrics(eventTime: EventTime): SessionMetrics? {
if (eventTime.timeline.isEmpty) return null
return getOrCreateSessionMetrics(eventTime.getUidOfPeriod(window))
}

private fun getOrCreateSessionMetrics(periodUid: Any): SessionMetrics {
return metricsSessions.getOrPut(periodUid) {
SessionMetrics(timeProvider) { sessionMetrics ->
player.sessionManager.getSessionFromPeriodUid(periodUid)?.let {
getMetricsForSession(it)?.let(this::notifyMetricsReady)
notifyMetricsReady(createPlaybackMetrics(session = it, metrics = sessionMetrics))
}
})
}
}
}

override fun onStallChanged(eventTime: EventTime, isStall: Boolean) {
if (isStall) {
totalStallTimeCounter.play()
stallCount++
} else {
totalStallTimeCounter.pause()
}
getSessionMetrics(eventTime)?.setIsStall(isStall)
}

override fun onIsPlayingChanged(eventTime: EventTime, isPlaying: Boolean) {
if (isPlaying) {
totalPlaytimeCounter.play()
} else {
totalPlaytimeCounter.pause()
}
getSessionMetrics(eventTime)?.setIsPlaying(isPlaying)
}

override fun onBandwidthEstimate(eventTime: EventTime, totalLoadTimeMs: Int, totalBytesLoaded: Long, bitrateEstimate: Long) {
bandwidth = bitrateEstimate
getSessionMetrics(eventTime)?.setBandwidthEstimate(totalLoadTimeMs, totalBytesLoaded, bitrateEstimate)
}

override fun onVideoInputFormatChanged(eventTime: EventTime, format: Format, decoderReuseEvaluation: DecoderReuseEvaluation?) {
videoFormat = format
getSessionMetrics(eventTime)?.videoFormat = format
}

/**
* On video disabled is called when releasing the player
*
* @param eventTime
* @param decoderCounters
*/
override fun onVideoDisabled(eventTime: EventTime, decoderCounters: DecoderCounters) {
videoFormat = null
if (player.playbackState == Player.STATE_IDLE || eventTime.timeline.isEmpty) return
getSessionMetrics(eventTime)?.videoFormat = null
}

override fun onAudioInputFormatChanged(eventTime: EventTime, format: Format, decoderReuseEvaluation: DecoderReuseEvaluation?) {
audioFormat = format
getSessionMetrics(eventTime)?.audioFormat = format
}

override fun onAudioDisabled(eventTime: EventTime, decoderCounters: DecoderCounters) {
audioFormat = null
}

private fun updateStartupTimeWithState(eventTime: EventTime, state: Int) {
if (eventTime.timeline.isEmpty) return
val periodUid = eventTime.getUidOfPeriod(window)
val startupTimes = getOrCreateLoadingTimes(periodUid)
startupTimes.state = state
if (player.playbackState == Player.STATE_IDLE || eventTime.timeline.isEmpty) return
getSessionMetrics(eventTime)?.audioFormat = null
}

override fun onPlaybackStateChanged(eventTime: EventTime, state: Int) {
updateStartupTimeWithState(eventTime, state)
when (state) {
Player.STATE_BUFFERING -> {
totalBufferingTimeCounter.play()
}

Player.STATE_READY -> {
totalBufferingTimeCounter.pause()
}
}
getSessionMetrics(eventTime)?.setPlaybackState(state)
}

override fun onRenderedFirstFrame(eventTime: EventTime, output: Any, renderTimeMs: Long) {
updateStartupTimeWithState(eventTime, player.playbackState)
getSessionMetrics(eventTime)?.setRenderFirstFrameOrAudioPositionAdvancing()
}

override fun onAudioPositionAdvancing(eventTime: EventTime, playoutStartSystemTimeMs: Long) {
updateStartupTimeWithState(eventTime, player.playbackState)
}

override fun onEvents(player: Player, events: AnalyticsListener.Events) {
bufferDuration = player.totalBufferedDuration.milliseconds
getSessionMetrics(eventTime)?.setRenderFirstFrameOrAudioPositionAdvancing()
}

override fun onLoadCompleted(eventTime: EventTime, loadEventInfo: LoadEventInfo, mediaLoadData: MediaLoadData) {
if (eventTime.timeline.isEmpty) return
val periodUid = eventTime.getUidOfPeriod(window)
val loadingTimes = getOrCreateLoadingTimes(periodUid)
val loadDuration = loadEventInfo.loadDurationMs.milliseconds
when (mediaLoadData.dataType) {
C.DATA_TYPE_DRM -> {
if (loadingTimes.drm == null) {
loadingTimes.drm = loadDuration
}
}

C.DATA_TYPE_MANIFEST -> {
if (loadingTimes.manifest == null) {
loadingTimes.manifest = loadDuration
}
}

C.DATA_TYPE_MEDIA -> {
if (loadingTimes.source == null) {
loadingTimes.source = loadDuration
}
}
getSessionMetrics(eventTime)?.setLoadCompleted(loadEventInfo, mediaLoadData)
}

PillarboxMediaSource.DATA_TYPE_CUSTOM_ASSET -> {
if (loadingTimes.asset == null) {
loadingTimes.asset = loadDuration
}
}
override fun onLoadStarted(eventTime: EventTime, loadEventInfo: LoadEventInfo, mediaLoadData: MediaLoadData) {
getSessionMetrics(eventTime)?.setLoadStarted(loadEventInfo)
}

else -> {
}
override fun onDrmSessionAcquired(eventTime: EventTime, state: Int) {
DebugLogger.debug(TAG, "onDrmSessionAcquired $state")
if (state == DrmSession.STATE_OPENED) {
getSessionMetrics(eventTime)?.setDrmSessionAcquired()
}
}

override fun onPlayerReleased(eventTime: EventTime) {
listeners.clear()
override fun onDrmSessionReleased(eventTime: EventTime) {
DebugLogger.debug(TAG, "onDrmSessionReleased")
}

private fun computeBitrate(): Int {
val videoBitrate = videoFormat?.bitrate ?: Format.NO_VALUE
val audioBitrate = audioFormat?.bitrate ?: Format.NO_VALUE
var bitrate = 0
if (videoBitrate > 0) bitrate += videoBitrate
if (audioBitrate > 0) bitrate += audioBitrate
return bitrate
override fun onDrmKeysLoaded(eventTime: EventTime) {
DebugLogger.debug(TAG, "onDrmKeysLoaded")
getSessionMetrics(eventTime)?.setDrmKeyLoaded()
}

private fun reset() {
stallCount = 0
totalStallTimeCounter.reset()
totalPlaytimeCounter.reset()
totalBufferingTimeCounter.reset()
override fun onDrmKeysRestored(eventTime: EventTime) {
DebugLogger.debug(TAG, "onDrmKeysRestored")
getSessionMetrics(eventTime)?.setDrmKeyLoaded()
}

bufferDuration = Duration.ZERO
override fun onDrmKeysRemoved(eventTime: EventTime) {
DebugLogger.debug(TAG, "onDrmKeysRemoved")
getSessionMetrics(eventTime)?.setDrmKeyLoaded()
}

audioFormat = player.audioFormat
videoFormat = player.videoFormat
if (player.isPlaying) {
totalPlaytimeCounter.play()
}
override fun onPlayerReleased(eventTime: EventTime) {
listeners.clear()
}

override fun onSurfaceSizeChanged(eventTime: EventTime, width: Int, height: Int) {
surfaceSize = Size(width, height)
}

/**
Expand All @@ -282,37 +241,44 @@ class MetricsCollector @VisibleForTesting private constructor(
}
}

private fun createPlaybackMetrics(session: PlaybackSessionManager.Session, metrics: SessionMetrics): PlaybackMetrics {
return PlaybackMetrics(
sessionId = session.sessionId,
bandwidth = metrics.estimateBitrate,
indicatedBitrate = metrics.getTotalBitrate(),
playbackDuration = metrics.totalPlayingDuration,
stallCount = metrics.stallCount,
stallDuration = metrics.totalStallDuration,
bufferingDuration = metrics.totalBufferingDuration,
loadDuration = PlaybackMetrics.LoadDuration(
drm = metrics.totalDrmLoadingDuration,
asset = metrics.asset,
source = metrics.source,
manifest = metrics.manifest,
timeToReady = metrics.timeToReady,
),
videoFormat = metrics.videoFormat,
audioFormat = metrics.audioFormat,
totalLoadTime = metrics.totalLoadTime,
totalBytesLoaded = metrics.totalBytesLoaded,
url = metrics.url,
surfaceSize = surfaceSize,
)
}

/**
* Get metrics for session
*
* @param session
* @return
*/
fun getMetricsForSession(session: PlaybackSessionManager.Session): PlaybackMetrics? {
val loadingTimes = getOrCreateLoadingTimes(session.periodUid)
return PlaybackMetrics(
sessionId = session.sessionId,
bandwidth = bandwidth,
bitrate = computeBitrate(),
bufferDuration = bufferDuration,
playbackDuration = totalPlaytimeCounter.getTotalPlayTime(),
stallCount = stallCount,
stallDuration = totalStallTimeCounter.getTotalPlayTime(),
loadDuration = loadingTimes.toLoadDuration()
)
return metricsSessions[session.periodUid]?.let {
createPlaybackMetrics(session, it)
}
}

private companion object {
const val TAG = "MetricsCollector"

private fun LoadingTimes.toLoadDuration(): PlaybackMetrics.LoadDuration {
return PlaybackMetrics.LoadDuration(
source = source,
manifest = manifest,
drm = drm,
asset = asset,
timeToReady = timeToReady,
)
}
}
}
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