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Customize & Debug ExoPlayer @droidkaigi 2020

TakuSemba
March 17, 2020
Technology
0
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Customize & Debug ExoPlayer @droidkaigi 2020

TakuSemba

March 17, 2020
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Transcript

  1. None

  2. @takusemba https://github.com/TakuSemba

  3. Media Streaming

  4. None
  5. None
  6. None
  7. None
  8. None

  9. Streaming Protocol

  10. Streaming Protocol

  11. None
  12. None
  13. None
  14. None
  15. None
  16. None
  17. None
  18. None
  19. None
  20. None

  21. ...

  22. Adaptive Bitrate

  23. None
  24. None
  25. None

  26. …

  27. None
  28. None
  29. None

  30. …

  31. None

  32. 10s ~

  33. ~ 25s

  34. val trackSelectionFactory = AdaptiveTrackSelection.Factory( MIN_DURATION_FOR_QUALITY_INCREASE_MS, MAX_DURATION_FOR_QUALITY_DECREASE_MS, ... )

  35. val trackSelectionFactory = AdaptiveTrackSelection.Factory( MIN_DURATION_FOR_QUALITY_INCREASE_MS, MAX_DURATION_FOR_QUALITY_DECREASE_MS, ... ) AdaptiveTrackSelection.Factory( MIN_DURATION_FOR_QUALITY_INCREASE_MS,

    )

  36. val trackSelectionFactory = AdaptiveTrackSelection.Factory( MIN_DURATION_FOR_QUALITY_INCREASE_MS, MAX_DURATION_FOR_QUALITY_DECREASE_MS, ... ) AdaptiveTrackSelection.Factory( MAX_DURATION_FOR_QUALITY_DECREASE_MS,

    )

  37. val trackSelectionFactory = AdaptiveTrackSelection.Factory( MIN_DURATION_FOR_QUALITY_INCREASE_MS, MAX_DURATION_FOR_QUALITY_DECREASE_MS, BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE, ... ) AdaptiveTrackSelection.Factory(

    BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE,

  38. val trackSelectionFactory = AdaptiveTrackSelection.Factory( MIN_DURATION_FOR_QUALITY_INCREASE_MS, MAX_DURATION_FOR_QUALITY_DECREASE_MS, BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE, ... ) AdaptiveTrackSelection.Factory(

    BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE, Edge Current Position Buffered Position 0.75

  39. val bandwidthMeter = DefaultBandwidthMeter.Builder(context).build()

  40. Bandwidth Time 10Mbps

  41. Bandwidth Time 10Mbps

  42. Bandwidth Time 10Mbps

  43. Bandwidth Time 10Mbps

  44. Bandwidth Time 10Mbps

  45. Bandwidth Time 10Mbps

  46. Bandwidth Time 10Mbps

  47. Bandwidth Time 10Mbps

  48. Bandwidth Time 10Mbps

  49. Bandwidth Time 10Mbps

  50. Bandwidth Time 10Mbps 6Mbps

  51. Bandwidth Time 10Mbps 6Mbps SlidingWindowMaxWeight

  52. Time 6Mbps SlidingWindowMaxWeight

  53. Time SlidingWindowMaxWeight 6Mbps * 0.75 = 4.5Mbps

  54. Time 6Mbps * 0.75 = 4.5Mbps SlidingWindowMaxWeight BandwidthFraction

  55. val trackSelectionFactory = AdaptiveTrackSelection.Factory( MIN_DURATION_FOR_QUALITY_INCREASE_MS, MAX_DURATION_FOR_QUALITY_DECREASE_MS, BANDWIDTH_FRACTION ... ) val

    bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setSlidingWindowMaxWeight(SLIDING_WINDOW_MAX_WEIGHT) .build()

  56. val trackSelectionFactory = AdaptiveTrackSelection.Factory( MIN_DURATION_FOR_QUALITY_INCREASE_MS, MAX_DURATION_FOR_QUALITY_DECREASE_MS, BANDWIDTH_FRACTION ... ) AdaptiveTrackSelection.Factory(

    BANDWIDTH_FRACTION val bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setSlidingWindowMaxWeight(SLIDING_WINDOW_MAX_WEIGHT) .build()

  57. val trackSelectionFactory = AdaptiveTrackSelection.Factory( MIN_DURATION_FOR_QUALITY_INCREASE_MS, MAX_DURATION_FOR_QUALITY_DECREASE_MS, BANDWIDTH_FRACTION ... ) val

    bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setSlidingWindowMaxWeight(SLIDING_WINDOW_MAX_WEIGHT) .build() .setSlidingWindowMaxWeight(SLIDING_WINDOW_MAX_WEIGHT)

  58. Initial Bitrate

  59. None

  60. ???

  61. 5.7Mbps Wifi

  62. 5.7Mbps Wifi

  63. 2.2Mbps 3G

  64. 2.2Mbps 3G

  65. 2.0Mbps Wifi

  66. 2.0Mbps Wifi

  67. 5.7Mbps Wifi

  68. 5.7Mbps Wifi

  69. val bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(INITIAL_BITRATE_ESTIMATE) .build()

  70. val bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(INITIAL_BITRATE_ESTIMATE) .build() .setInitialBitrateEstimate(INITIAL_BITRATE_ESTIMATE)

  71. val bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() 180p 360p 720p Session

    Scope

  72. Session Scope 720p val bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build()

  73. Session Scope 180p 360p 720p val bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE)

    .build() 720p

  74. Session Scope val bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() 180p 360p

    720p

  75. Session Scope val bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() 720p

  76. Session Scope val bandwidthMeter = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() 180p 360p

    720p 720p

  77. fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance == null) {

    singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() } return singletonInstance } Application Scope 180p 360p 720p

  78. Application Scope 720p fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance

    == null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() } return singletonInstance }

  79. Application Scope 720p 720p 720p fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter {

    if (singletonInstance == null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() } return singletonInstance } 720p

  80. Application Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() } return singletonInstance } 720p 720p 720p

  81. Application Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() } return singletonInstance } 720p Launch App

  82. Application Scope Launch App fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if

    (singletonInstance == null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() } return singletonInstance } 720p 180p 360p 720p

  83. Application Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() } return singletonInstance } 180p 360p 720p

  84. Application Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() } return singletonInstance } 720p

  85. Application Scope Wifi -> 4G fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter {

    if (singletonInstance == null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .build() } return singletonInstance } 720p 720p

  86. Application Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } 720p 720p Wifi -> 4G

  87. Application Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } 720p Wifi -> 4G .setResetOnNetworkTypeChange(true) 720p

  88. Application Scope Wifi -> 4G 720p 180p 360p fun getSingletonBandwidthMeter(context:

    Context): DefaultBandwidthMeter { if (singletonInstance == null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(LOWEST_RESOLUTION_BITRATE) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } 720p

  89. Lifetime Scope 180p 360p 720p fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter {

    if (singletonInstance == null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance }

  90. Lifetime Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) 180p 360p 720p

  91. Lifetime Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } .setResetOnNetworkTypeChange(true) 180p 360p 720p

  92. Lifetime Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } 180p 360p 720p

  93. Lifetime Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } 720p

  94. 720p 720p 720p Lifetime Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter {

    if (singletonInstance == null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } 720p

  95. Lifetime Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } 720p 720p 720p

  96. Lifetime Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if (singletonInstance ==

    null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } 720p Launch App

  97. Launch App Lifetime Scope fun getSingletonBandwidthMeter(context: Context): DefaultBandwidthMeter { if

    (singletonInstance == null) { singletonInstance = DefaultBandwidthMeter.Builder(context) .setInitialBitrateEstimate(prefs.getLastEstimatedBitrate()) .setResetOnNetworkTypeChange(true) .build() } return singletonInstance } 720p 720p 720p 720p

  98. Limit Bitrate

  99. None
  100. None

  101. val trackSelectionFactory = AdaptiveTrackSelection.Factory(...) val parameter = DefaultTrackSelector.ParametersBuilder(context) .setMaxVideoBitrate(MAX_VIDEO_BITRARE) .build()

    val trackSelector = DefaultTrackSelector(parameter, trackSelectionFactory)

  102. val trackSelectionFactory = AdaptiveTrackSelection.Factory(...) val parameter = DefaultTrackSelector.ParametersBuilder(context) .setMaxVideoBitrate(MAX_VIDEO_BITRARE) .build()

    val trackSelector = DefaultTrackSelector(parameter, trackSelectionFactory) .setMaxVideoBitrate(MAX_VIDEO_BITRARE)

  103. val trackSelectionFactory = AdaptiveTrackSelection.Factory(...) val parameter = DefaultTrackSelector.ParametersBuilder(context) .setMaxVideoSize(640, 360)

    .build() val trackSelector = DefaultTrackSelector(parameter, trackSelectionFactory)

  104. val trackSelectionFactory = AdaptiveTrackSelection.Factory(...) val parameter = DefaultTrackSelector.ParametersBuilder(context) .setMaxVideoSize(640, 360)

    .build() val trackSelector = DefaultTrackSelector(parameter, trackSelectionFactory) .setMaxVideoSize(640, 360)
  105. None

  106. val newParameter = DefaultTrackSelector.ParametersBuilder(context) .setMaxVideoBitrate(NEW_MAX_VIDEO_BITRARE) .build() trackSelector.parameters = newParameter

  107. val newParameter = DefaultTrackSelector.ParametersBuilder(context) .setMaxVideoBitrate(NEW_MAX_VIDEO_BITRARE) .build() trackSelector.parameters = newParameter trackSelector.parameters

    = newParameter
  108. None
  109. None
  110. None
  111. None
  112. None

  113. class LimitTrackSelection(...) : AdaptiveTrackSelection(...) { private var maxVideoBitrate = Int.MAX_VALUE

    fun setMaxVideoBitrate(maxVideoBitrate: Int) { this.maxVideoBitrate = maxVideoBitrate } override fun canSelectFormat( format: Format, trackBitrate: Int, playbackSpeed: Float, effectiveBitrate: Long ): Boolean { return trackBitrate <= maxVideoBitrate && super.canSelectFormat(...) } }

  114. class LimitTrackSelection(...) : AdaptiveTrackSelection(...) { private var maxVideoBitrate = Int.MAX_VALUE

    fun setMaxVideoBitrate(maxVideoBitrate: Int) { this.maxVideoBitrate = maxVideoBitrate } override fun canSelectFormat( format: Format, trackBitrate: Int, playbackSpeed: Float, effectiveBitrate: Long ): Boolean { return trackBitrate <= maxVideoBitrate && super.canSelectFormat(...) } } AdaptiveTrackSelection(...) { override fun canSelectFormat( format: Format, trackBitrate: Int, playbackSpeed: Float, effectiveBitrate: Long ): Boolean }

  115. class LimitTrackSelection(...) : AdaptiveTrackSelection(...) { private var maxVideoBitrate = Int.MAX_VALUE

    fun setMaxVideoBitrate(maxVideoBitrate: Int) { this.maxVideoBitrate = maxVideoBitrate } override fun canSelectFormat( format: Format, trackBitrate: Int, playbackSpeed: Float, effectiveBitrate: Long ): Boolean { return trackBitrate <= maxVideoBitrate && super.canSelectFormat(...) } } private var maxVideoBitrate = Int.MAX_VALUE fun setMaxVideoBitrate(maxVideoBitrate: Int) { this.maxVideoBitrate = maxVideoBitrate } override fun canSelectFormat( { return trackBitrate <= maxVideoBitrate } }

  116. class LimitTrackSelection(...) : AdaptiveTrackSelection(...) { private var maxVideoBitrate = Int.MAX_VALUE

    fun setMaxVideoBitrate(maxVideoBitrate: Int) { this.maxVideoBitrate = maxVideoBitrate } override fun canSelectFormat( format: Format, trackBitrate: Int, playbackSpeed: Float, effectiveBitrate: Long ): Boolean { return trackBitrate <= maxVideoBitrate && super.canSelectFormat(...) } } https://github.com/google/ExoPlayer/issues/2250

  117. Chunkless Preparation

  118. m3u8 Playlist

  119. ts First Chunk Playlist

  120. First Chunk Playlist Prepare Decoder

  121. First Chunk Playlist Prepare Decoder Start Decodeing

  122. #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=200000,CODECS="mp4a.40.2, avc1.4d4015" index1.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=600000,CODECS=“mp4a.40.2, avc1.4d401e" index2.m3u8 …

  123. #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=200000,CODECS="mp4a.40.2, avc1.4d4015" index1.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=600000,CODECS=“mp4a.40.2, avc1.4d401e" index2.m3u8 … CODECS="mp4a.40.2, avc1.4d4015"

    CODECS=“mp4a.40.2, avc1.4d401e"

  124. #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=200000,CODECS="mp4a.40.2, avc1.4d4015" index1.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=600000,CODECS=“mp4a.40.2, avc1.4d401e" index2.m3u8 … CODECS="mp4a.40.2, avc1.4d4015"

    CODECS=“mp4a.40.2, avc1.4d401e" val hlsMediaSource = HlsMediaSource.Factory(dataSourceFactory) .setAllowChunklessPreparation(true) .createMediaSource(uri)

  125. #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=200000,CODECS="mp4a.40.2, avc1.4d4015" index1.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=600000,CODECS=“mp4a.40.2, avc1.4d401e" index2.m3u8 … CODECS="mp4a.40.2, avc1.4d4015"

    CODECS=“mp4a.40.2, avc1.4d401e" val hlsMediaSource = HlsMediaSource.Factory(dataSourceFactory) .setAllowChunklessPreparation(true) .createMediaSource(uri) .setAllowChunklessPreparation(true)

  126. m3u8 Playlist

  127. ts First Chunk Playlist Prepare Decoder

  128. First Chunk Playlist Prepare Decoder Start Decodeing

  129. Reuse Decoder

  130. Renderer

  131. None

  132. Disabled Enabled Started

  133. Disabled Enabled Started No Streams No Decoders Have Streams Might

    Have Decoders Decoding

  134. Disabled Enabled Started No Streams No Decoders Have Streams Might

    Have Decoders Decoding Prepare Player

  135. Disabled Enabled Started ~ v2.10.0 No Streams No Decoders Have

    Streams Might Have Decoders Decoding Prepare Player

  136. Disabled Enabled Started ~ v2.10.0 No Streams No Decoders Have

    Streams Might Have Decoders Decoding Prepare Player

  137. Disabled Enabled Started ~ v2.10.0

  138. Disabled Enabled Started ~ v2.10.0 v2.10.0 ~ Disabled Enabled Started

  139. v2.10.0 ~ Disabled Enabled Started

  140. v2.10.0 ~ Disabled Enabled Started

  141. v2.10.0 ~ Disabled Enabled Started Prepare Decoder Content A Content

    B Content C

  142. Tunneled Video Playback

  143. Media Source Renderer (Video) Renderer (Audio) Media Codec (Video) Media

    Codec (Audio) Audio Track Surface A/V Sync

  144. Media Source Renderer (Video) Renderer (Audio) Media Codec (Video) Media

    Codec (Audio) Audio Track Surface A/V Sync

  145. Media Source Renderer (Video) Renderer (Audio) Media Codec (Video) Media

    Codec (Audio) Audio Track Surface A/V Sync

  146. Media Source Renderer (Video) Renderer (Audio) Media Codec (Video) Media

    Codec (Audio) Audio Track Surface A/V Sync

  147. Media Source Renderer (Video) Renderer (Audio) Media Codec (Video) Media

    Codec (Audio) Audio Track Surface A/V Sync

  148. Media Source Renderer (Video) Renderer (Audio) Media Codec (Video) Media

    Codec (Audio) Audio Track Surface A/V Sync

  149. val parameter = DefaultTrackSelector.ParametersBuilder() .setTunnelingAudioSessionId(C.generateAudioSessionIdV21(this)) .build()

  150. val parameter = DefaultTrackSelector.ParametersBuilder() .setTunnelingAudioSessionId(C.generateAudioSessionIdV21(this)) .build() .setTunnelingAudioSessionId(C.generateAudioSessionIdV21(this))

  151. Systrace

  152. thread(name = "example-thread") { Trace.beginSection("do something") // do something Trace.endSection()

    }

  153. thread(name = "example-thread") { Trace.beginSection("do something") // do something Trace.endSection()

    } python systrace.py --app package-name --time=10 -o ~/Downloads/example.html
  154. None

  155. python systrace.py --app "com.google.android.exoplayer2.demo" --time=10 -o ~/Downloads/trace.html

  156. Load Master Playlist

  157. Load Media Playlist

  158. Load First Chunk

  159. Prepare Decoder

  160. None

  161. Initialize Video Decoder

  162. Initialize Audio Decoder

  163. None

  164. Render Video Output Buffer

  165. Traditional Preparation Chunkless Preparation

  166. Traditional Preparation Chunkless Preparation

  167. Video Decoder Audio Decoder Decoder Initialization (150ms)

  168. ~ v2.10.0 (reuse decoder) v2.10.0 ~ (create recoders)

  169. ~ v2.10.0 (reuse decoder) v2.10.0 ~ (create recoders)

  170. with tunneling without tunneling

  171. Reference https://medium.com/google-exoplayer/faster-hls-preparation-f6611aa15ea6 https://medium.com/google-exoplayer/tunneled-video-playback-in-exoplayer-84f084a8094d https://medium.com/google-exoplayer/improved-decoder-reuse-in-exoplayer-ef4c6d99591d https://exoplayer.dev