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Media streaming on Android TakuSemba CyberAgent.Inc

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@takusemba https://github.com/TakuSemba

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Player

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API level 1 API level 14 Simple use cases Advanced use cases Black Box Customizable MediaPlayer ExoPlayer

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ExoPlayer dependencies { implementation ‘com.google.android.exoplayer:exoplayer:x.x.x’ }

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ExoPlayer dependencies { implementation ‘com.google.android.exoplayer:exoplayer-core:x.x.x’ implementation ‘com.google.android.exoplayer:exoplayer-ui:x.x.x’ implementation ‘com.google.android.exoplayer:exoplayer-hls:x.x.x’ }

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ExoPlayer dependencies { implementation ‘com.google.android.exoplayer:exoplayer-core:x.x.x’ implementation ‘com.google.android.exoplayer:exoplayer-ui:x.x.x’ implementation ‘com.google.android.exoplayer:exoplayer-hls:x.x.x’ implementation ‘com.google.android.exoplayer:extension-okhttp:x.x.x’ }

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Streaming

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Streaming HTTP video

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Streaming video

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Streaming 1min 1sec × 60files video .mp4 .mp4 video

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Streaming time video1 video2 video3 video4

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Streaming time video1 video2 video3 video4

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time Streaming video1 video2 video3 video4 video1

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Streaming time video1 video2 video3 video4 video1 video2

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Streaming time video1 video2 video3 video4 video1 video2 video3

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time video1 video2 video3 video4 Streaming video1 video2 video3 video4

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Streaming

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1 pixel = 24 bits (1byte for red, blue, green) Streaming 1 pixel

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1 pixel = 24 bits (1byte for red, blue, green) 1 frame = 49m bits (1080px * 1920px * 24bits) Streaming 1 frame

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1 pixel = 24 bits (1byte for red, blue, green) 1 frame = 49m bits (1080px * 1920px * 24bits) 1 second = 1492m bits (30fps * 49m bits) Streaming 1 second

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1 pixel = 24 bits (1byte for red, blue, green) 1 frame = 49m bits (1080px * 1920px * 24bits) 1 second = 1492m bits (30fps * 49m bits) 1492m bits Streaming 1 second

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1 pixel = 24 bits (1byte for red, blue, green) 1 frame = 49m bits (1080px * 1920px * 24bits) 1 second = 1492m bits (30fps * 49m bits) 1492m bits > 60m bps (4G LTE) Streaming 1 second

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1 pixel = 24 bits (1byte for red, blue, green) 1 frame = 49m bits (1080px * 1920px * 24bits) 1 second = 1492m bits (30fps * 49m bits) 1492m bits > 60m bps (4G LTE) codec (h264) Streaming 1 second

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1 pixel = 24 bits (1byte for red, blue, green) 1 frame = 49m bits (1080px * 1920px * 24bits) 1 second = 1492m bits (30fps * 49m bits) 1492m bits > 60m bps (4G LTE) 14.92m bits < 60m bps (4G LTE) codec (h264) Streaming 1 second

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Resize This Window Resize This Window https://developer.android.com/guide/topics/media/media-formats.html

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HLS

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master playlist media playlists ts files .m3u8 .mp4 .mp4 .m3u8 .mp4 .mp4 .ts

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master playlist media playlists ts files .m3u8 .mp4 .mp4 .m3u8 .mp4 .mp4 .ts

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client master playlist .m3u8

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HTTP client master playlist .m3u8

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Master Playlist #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=300000 http://mycompany.com/240p.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=1400000 http://mycompany.com/480p.m3u8 … #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=2400000 http://mycompany.com/720p.m3u8 …

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Master Playlist #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=300000 http://mycompany.com/240p.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=1400000 http://mycompany.com/480p.m3u8 … #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=2400000 http://mycompany.com/720p.m3u8 … #EXTM3U

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Master Playlist #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=300000 http://mycompany.com/240p.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=1400000 http://mycompany.com/480p.m3u8 … #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=2400000 http://mycompany.com/720p.m3u8 … #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=300000 http://mycompany.com/240p.m3u8

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Master Playlist #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=300000 http://mycompany.com/240p.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=1400000 http://mycompany.com/480p.m3u8 … #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=2400000 http://mycompany.com/720p.m3u8 … #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=300000

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Master Playlist #EXTM3U #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=300000 http://mycompany.com/240p.m3u8 #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=1400000 http://mycompany.com/480p.m3u8 … #EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=2400000 http://mycompany.com/720p.m3u8 … http://mycompany.com/240p.m3u8

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master playlist media playlists ts files .m3u8 .mp4 .mp4 .m3u8 .mp4 .mp4 .ts

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client 480p 240p 720p HTTP .m3u8 .m3u8 .m3u8

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Media Playlist #EXT-X-VERSION:3 #EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1 #EXTINF:10.0, http://media.example.com/segment1.ts #EXTINF:9.0, http://media.example.com/segment2.ts #EXTINF:7.5, http://media.example.com/segment3.ts #EXTINF:8.5, http://media.example.com/segment4.ts …

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Media Playlist #EXT-X-VERSION:3 #EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1 #EXTINF:10.0, http://media.example.com/segment1.ts #EXTINF:9.0, http://media.example.com/segment2.ts #EXTINF:7.5, http://media.example.com/segment3.ts #EXTINF:8.5, http://media.example.com/segment4.ts … #EXTINF:10.0, http://media.example.com/segment1.ts

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Media Playlist #EXT-X-VERSION:3 #EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1 #EXTINF:10.0, http://media.example.com/segment1.ts #EXTINF:9.0, http://media.example.com/segment2.ts #EXTINF:7.5, http://media.example.com/segment3.ts #EXTINF:8.5, http://media.example.com/segment4.ts … #EXTINF:10.0,

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Media Playlist #EXT-X-VERSION:3 #EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1 #EXTINF:10.0, http://media.example.com/segment1.ts #EXTINF:9.0, http://media.example.com/segment2.ts #EXTINF:7.5, http://media.example.com/segment3.ts #EXTINF:8.5, http://media.example.com/segment4.ts … http://media.example.com/segment1.ts

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Media Playlist #EXT-X-VERSION:3 #EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1 #EXTINF:10.0, http://media.example.com/segment1.ts #EXTINF:9.0, http://media.example.com/segment2.ts #EXTINF:7.5, http://media.example.com/segment3.ts #EXTINF:8.5, http://media.example.com/segment4.ts … http://media.example.com/segment2.ts

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Media Playlist #EXT-X-VERSION:3 #EXTM3U #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1 #EXTINF:10.0, http://media.example.com/segment1.ts #EXTINF:9.0, http://media.example.com/segment2.ts #EXTINF:7.5, http://media.example.com/segment3.ts #EXTINF:8.5, http://media.example.com/segment4.ts … http://media.example.com/segment3.ts

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master playlist media playlists ts files .m3u8 .mp4 .mp4 .m3u8 .mp4 .mp4 .ts

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client 480p 240p 720p HTTP .m3u8 .m3u8 .m3u8 .mp4 .mp4 .ts .mp4 .mp4 .ts .mp4 .mp4 .ts

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client 480p 240p 720p HTTP .m3u8 .m3u8 .m3u8 .mp4 .mp4 .ts .mp4 .mp4 .ts .mp4 .mp4 .ts

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HTTP client 480p 240p 720p .m3u8 .m3u8 .m3u8 .mp4 .mp4 .ts .mp4 .mp4 .ts .mp4 .mp4 .ts

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HTTP client 480p 240p 720p .m3u8 .m3u8 .m3u8 .mp4 .mp4 .ts .mp4 .mp4 .ts .mp4 .mp4 .ts

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MPEG-DASH

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MPD fragmented mp4 file Initialization file .mpd .mp4 .mp4

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MPD fragmented mp4 file Initialization file .mpd .mp4 .mp4

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MPD fragmented mp4 file Initialization file .mpd .mp4 .mp4

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MP4 ftyp: file type moov: header data mdat: audio or video data

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ftyp: file type moof: header data sidx: index of moof + mdat Fragmented MP4 mdat: audio or video data

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Fragmented MP4 fragmented mp4 segment files .mp4 .mp4 .mp4 .m4s

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MPD fragmented mp4 file Initialization file .mpd .mp4 .mp4

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MPD 400k.mp4 … output_audio_dashinit.mp4

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MPD ɾlive or onDemand ? ɾresolution ? ɾbyte range or segment path

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ExoPlayer

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val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) val playerView = findViewById(R.id.player_view) playerView.player = player val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) val playerView = findViewById(R.id.player_view) playerView.player = player val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() )

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val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) val playerView = findViewById(R.id.player_view) playerView.player = player val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true val playerView = findViewById(R.id.player_view) playerView.player = player

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val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) val playerView = findViewById(R.id.player_view) playerView.player = player val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null)

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val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) val playerView = findViewById(R.id.player_view) playerView.player = player val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) val playerView = findViewById(R.id.player_view) playerView.player = player val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true // clean up player.release()

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val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) val playerView = findViewById(R.id.player_view) playerView.player = player val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance(…) val playerView = findViewById(R.id.player_view) playerView.player = player val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance(…) val playerView = findViewById(R.id.player_view) playerView.player = player val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance(…) val playerView = findViewById(R.id.player_view) playerView.player = player val okHttpClient = OkHttpClient.Builder() .connectTimeout(10L, TimeUnit.SECONDS) .writeTimeout(10L, TimeUnit.SECONDS) .readTimeout(30L, TimeUnit.SECONDS) .build() val dataSourceFactory = DefaultDataSourceFactory(context, "user-agent") val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance(…) val playerView = findViewById(R.id.player_view) playerView.player = player val okHttpClient = OkHttpClient.Builder() .connectTimeout(10L, TimeUnit.SECONDS) .writeTimeout(10L, TimeUnit.SECONDS) .readTimeout(30L, TimeUnit.SECONDS) .build() val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance(…) val playerView = findViewById(R.id.player_view) playerView.player = player val okHttpClient = OkHttpClient.Builder() .connectTimeout(10L, TimeUnit.SECONDS) .writeTimeout(10L, TimeUnit.SECONDS) .readTimeout(30L, TimeUnit.SECONDS) .build() val dataSourceFactory = OkHttpDataSourceFactory(okHttpClient, “user-agent”, null) val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance(…) val playerView = findViewById(R.id.player_view) playerView.player = player val okHttpClient = OkHttpClient(…) val dataSourceFactory = OkHttpDataSourceFactory(okHttpClient, “user-agent”, null) val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) val playerView = findViewById(R.id.player_view) playerView.player = player val okHttpClient = OkHttpClient(…) val dataSourceFactory = OkHttpDataSourceFactory(okHttpClient, “user-agent”, null) val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) val playerView = findViewById(R.id.player_view) playerView.player = player val okHttpClient = OkHttpClient(…) val dataSourceFactory = OkHttpDataSourceFactory(okHttpClient, “user-agent”, null) val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl()

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Renderer val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() )

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Renderer val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) DefaultRenderersFactory(context)

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Renderer public class MyRenderer implements Renderer { // make your own renderer }

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Renderer public class MyRenderer implements Renderer { // make your own renderer } DefaultRenderersFactory(..., MyRenderer())

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TrackSelector val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() )

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TrackSelector val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) DefaultTrackSelector(),

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TrackSelector val selector = DefaultTrackSelector()

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TrackSelector val factory = AdaptiveTrackSelection.Factory( DefaultBandwidthMeter(), DEFAULT_MAX_INITIAL_BITRATE, DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS, DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS, DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS, DEFAULT_BANDWIDTH_FRACTION)

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TrackSelector val factory = AdaptiveTrackSelection.Factory( DefaultBandwidthMeter(), DEFAULT_MAX_INITIAL_BITRATE, DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS, DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS, DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS, DEFAULT_BANDWIDTH_FRACTION) val selector = DefaultTrackSelector(factory)

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TrackSelector val selector = DefaultTrackSelector(factory) val factory = AdaptiveTrackSelection.Factory( DefaultBandwidthMeter(), HIEST_BITRATE, DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS, DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS, DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS, DEFAULT_BANDWIDTH_FRACTION)

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client 480p 240p 720p HTTP .m3u8 .m3u8 .m3u8

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client 480p 240p 720p .m3u8 .m3u8 .m3u8 HTTP

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TrackSelector val selector = DefaultTrackSelector(factory) val factory = AdaptiveTrackSelection.Factory( DefaultBandwidthMeter(), DEFAULT_MAX_INITIAL_BITRATE, DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS, DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS, DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS, DEFAULT_BANDWIDTH_FRACTION)

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TrackSelector val selector = DefaultTrackSelector(factory) val factory = AdaptiveTrackSelection.Factory( DefaultBandwidthMeter(), DEFAULT_MAX_INITIAL_BITRATE, DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS, DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS, DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS, DEFAULT_BANDWIDTH_FRACTION) DefaultBandwidthMeter(),

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TrackSelector public final class DefaultBandwidthMeter implements BandwidthMeter, TransferListener { @Override public long getBitrateEstimate() { return currentBitrate; } @Override public void onTransferStart(Object source, DataSpec dataSpec) { } @Override public void onBytesTransferred(Object source, int bytesTransferred) { } @Override public void onTransferEnd(Object source) { } }

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TrackSelector public final class DefaultBandwidthMeter implements BandwidthMeter, TransferListener { @Override public long getBitrateEstimate() { return currentBitrate; } @Override public void onTransferStart(Object source, DataSpec dataSpec) { } @Override public void onBytesTransferred(Object source, int bytesTransferred) { } @Override public void onTransferEnd(Object source) { } } @Override public long getBitrateEstimate() { return currentBitrate; }

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TrackSelector public final class MyBandwidthMeter implements BandwidthMeter, TransferListener { @Override public long getBitrateEstimate() { return Math.min(currentBitrate, limitBitrate); } @Override public void onTransferStart(Object source, DataSpec dataSpec) { } @Override public void onBytesTransferred(Object source, int bytesTransferred) { } @Override public void onTransferEnd(Object source) { } } @Override public long getBitrateEstimate() { return Math.min(currentBitrate, limitBitrate); } MyBandwidthMeter

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TrackSelector val selector = DefaultTrackSelector(factory) val factory = AdaptiveTrackSelection.Factory( MyBandwidthMeter(), DEFAULT_MAX_INITIAL_BITRATE, DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS, DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS, DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS, DEFAULT_BANDWIDTH_FRACTION)

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TrackSelector val selector = DefaultTrackSelector(factory) val factory = AdaptiveTrackSelection.Factory( MyBandwidthMeter(), DEFAULT_MAX_INITIAL_BITRATE, DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS, DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS, DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS, DEFAULT_BANDWIDTH_FRACTION) MyBandwidthMeter(),

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client 480p 240p 720p .m3u8 .m3u8 .m3u8 HTTP

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TrackSelector public final class MyBandwidthMeter implements BandwidthMeter, TransferListener { @Override public long getBitrateEstimate() { return Math.max(currentBitrate, limitBitrate); } @Override public void onTransferStart(Object source, DataSpec dataSpec) { } @Override public void onBytesTransferred(Object source, int bytesTransferred) { } @Override public void onTransferEnd(Object source) { } }

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TrackSelector public final class MyBandwidthMeter implements BandwidthMeter, TransferListener { @Override public long getBitrateEstimate() { return Math.max(currentBitrate, limitBitrate); } @Override public void onTransferStart(Object source, DataSpec dataSpec) { } @Override public void onBytesTransferred(Object source, int bytesTransferred) { } @Override public void onTransferEnd(Object source) { } } return Math.max(currentBitrate, limitBitrate); MyBandwidthMeter

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client 480p 240p 720p HTTP .m3u8 .m3u8 .m3u8

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LoadControl val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() )

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LoadControl val player = ExoPlayerFactory.newSimpleInstance( DefaultRenderersFactory(context), DefaultTrackSelector(), DefaultLoadControl() ) DefaultLoadControl()

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LoadControl val loadControl = DefaultLoadControl()

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LoadControl val loadControl = DefaultLoadControl( DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE), DEFAULT_MIN_BUFFER_MS, DEFAULT_MAX_BUFFER_MS, DEFAULT_BUFFER_FOR_PLAYBACK_MS, DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS )

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LoadControl val loadControl = DefaultLoadControl( DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE), DEFAULT_MIN_BUFFER_MS, DEFAULT_MAX_BUFFER_MS, DEFAULT_BUFFER_FOR_PLAYBACK_MS, DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS ) DEFAULT_MIN_BUFFER_MS, DEFAULT_MAX_BUFFER_MS, DEFAULT_BUFFER_FOR_PLAYBACK_MS, DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS

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MediaSource val mediaSource = HlsMediaSource(uri, dataSourceFactory, handler, null) player.prepare(mediaSource) player.playWhenReady = true

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MediaSource val mediaSource = DashMediaSource(Uri, …) player.prepare(mediaSource) player.playWhenReady = true

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MediaSource val mediaSource = ExtractorMediaSource(Uri, …) player.prepare(mediaSource) player.playWhenReady = true

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MediaSource val firstSource = HlsMediaSource(firstUri, …) val secondSource = HlsMediaSource(secondUri, …) val mediaSource = ConcatenatingMediaSource(firstSource, secondSource) // play firstSource, then secondSource player.prepare(mediaSource) player.playWhenReady = true

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Metadata

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Metadata video

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Metadata video createdAt? title? thumbnail? genre?

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Metadata ɾID3 tag

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Metadata ɾID3 tag .ts id = 1000 place = droidkaigi

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Metadata

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Metadata class Logger : MetadataOutput { override fun onMetadata(metadata: Metadata) { (1..metadata.length()) .map { metadata[it] } .filterIsInstance() .forEach { print("metadata: ${it.value}") } } } // metadata: id=1000,place=droidkaigi

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Metadata ɾID3 tag ɾemsg box

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Metadata ɾID3 tag id = 1000 place = droidkaigi ɾemsg box .mp4

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Metadata class Logger : MetadataOutput { override fun onMetadata(metadata: Metadata) { (1..metadata.length()) .map { metadata[it] } .filterIsInstance() .forEach { print("metadata: ${it.value}") } } } // metadata: id=1000,place=droidkaigi

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Publish

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UDP TCP 1:1 1:n low latency high latency WebRTC RTMP

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RTMP RTMP client server

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RTMP RTMP client server users RTMP

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RTMP RTMP client server users HLS MPEG-DASH

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RTMP ɾdeveloped by Adobe. not “open” protocol ɾRed5 started rtmp in 2005 ɾWowza started rtmp in 2007 ɾrtmpdump released in 2008 ɾrtmp specification released 2012

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RTMP “we will stop updating and distributing the Flash Player at the end of 2020” -Adobe

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RTMP RTMP

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RTMP RTMP

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RTMP RTMP

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RTMP RTMP

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RTMP PRO CON ɾsmall header (basically 1, 4, 8, 12 bytes) ɾrealtime ɾdifficult to cache ɾno multiple resolutions

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RTMP RTMP

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RTMP RTMP RTMP

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RTMP RTMP

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RTMP dependencies { implementation ‘com.google.android.exoplayer:exoplayer-core:x.x.x’ implementation ‘com.google.android.exoplayer:exoplayer-ui:x.x.x’ implementation ‘com.google.android.exoplayer:extension-rtmp:x.x.x’ }

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val mediaSource = ExtractorMediaSource( Uri.parse("rtmp://xxx.xx.xx.xxx:1935/path/stream_name") RtmpDataSourceFactory(), DefaultExtractorsFactory(), null, null) player.prepare(mediaSource) player.playWhenReady = true

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val mediaSource = ExtractorMediaSource( Uri.parse("rtmp://xxx.xx.xx.xxx:1935/path/stream_name") RtmpDataSourceFactory(), DefaultExtractorsFactory(), null, null) player.prepare(mediaSource) player.playWhenReady = true Uri.parse("rtmp://xxx.xx.xx.xxx:1935/path/stream_name")

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val mediaSource = ExtractorMediaSource( Uri.parse("rtmp://xxx.xx.xx.xxx:1935/path/stream_name") RtmpDataSourceFactory(), DefaultExtractorsFactory(), null, null) player.prepare(mediaSource) player.playWhenReady = true RtmpDataSourceFactory(),

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public final class RtmpDataSource implements DataSource { private RtmpClient rtmpClient; ... @Override public int read(byte[] buffer, int offset, int readLength) throws IOException { int bytesRead = rtmpClient.read(buffer, offset, readLength); ... return bytesRead; } ... }

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public final class RtmpDataSource implements DataSource { private RtmpClient rtmpClient; ... @Override public int read(byte[] buffer, int offset, int readLength) throws IOException { int bytesRead = rtmpClient.read(buffer, offset, readLength); ... return bytesRead; } ... } private RtmpClient rtmpClient; rtmpClient.read(buffer, offset, readLength);

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public class RtmpClient { … public int read(byte[] data, int offset, int size) throws IOException { return nativeRead(data, offset, size, rtmpPointer); } private native int nativeRead(byte[] data, int offset, int size, long rtmpPointer) throws IOException … }

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public class RtmpClient { … public int read(byte[] data, int offset, int size) throws IOException { return nativeRead(data, offset, size, rtmpPointer); } private native int nativeRead(byte[] data, int offset, int size, long rtmpPointer) throws IOException … } private native int nativeRead(byte[] data, int offset, int size, long rtmpPointer) public class RtmpClient

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RTMP RTMP

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RTMP ɾcapture data ɾencode data ɾpublish data

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RTMP ɾcapture data ɾencode data ɾpublish data

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RTMP ɾcapture data ɾencode data ɾpublish data val audioRecord = AudioRecord(...) Audio Data

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RTMP ɾcapture data ɾencode data ɾpublish data val audioRecord = AudioRecord(...) // camera2 API val manager : CameraManager manager.openCamera(...) // camera API val camera = Camera.(info) Audio Data Video Data

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RTMP ɾcapture data ɾencode data ɾpublish data

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RTMP // MediaCodec.java val encoder = MediaCodec(…) encoder.start() val inputBuffers = encoder.getInputBuffer(index) // or val surface = encoder.createInputSurface() // get encoded data val outputBuffers = encoder.getOutputBuffer(index) ɾcapture data ɾencode data ɾpublish data

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RTMP // MediaCodec.java val encoder = MediaCodec(…) encoder.start() val inputBuffers = encoder.getInputBuffer(index) // or val surface = encoder.createInputSurface() // get encoded data val outputBuffers = encoder.getOutputBuffer(index) ɾcapture data ɾencode data ɾpublish data // MediaCodec.java val encoder = MediaCodec(…) encoder.start()

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RTMP ɾcapture data ɾencode data ɾpublish data // MediaCodec.java val encoder = MediaCodec(…) encoder.start() val inputBuffers = encoder.getInputBuffer(index) // or val surface = encoder.createInputSurface() // get encoded data val outputBuffers = encoder.getOutputBuffer(index) val inputBuffers = encoder.getInputBuffer(index) // or val surface = encoder.createInputSurface()

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RTMP ɾcapture data ɾencode data ɾpublish data // MediaCodec.java val encoder = MediaCodec(…) encoder.start() val inputBuffers = encoder.getInputBuffer(index) // or val surface = encoder.createInputSurface() // get encoded data val outputBuffers = encoder.getOutputBuffer(index) // get encoded data val outputBuffers = encoder.getOutputBuffer(index)

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RTMP ɾcapture data ɾencode data ɾpublish data

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RTMP // rtmpdump public native int writeVideo( byte[] data, int offset, int length, int timestamp ) ɾcapture data ɾencode data ɾpublish data

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RTMP // rtmpdump public native int writeVideo( byte[] data, int offset, int length, int timestamp ) // Socket.java val socket = Socket(“192.xx.xx.xxx", 1935) val outputStream = DataOutputStream(…) outputStream.write(byteArray) ɾcapture data ɾencode data ɾpublish data

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https://github.com/TakuSemba/RtmpPublisher

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Demo

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Demo RTMP Server HLS RTMP Publisher Player Player

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Demo rtmp://160.16.54.236:1935/live/takusemba http://160.16.54.236/hls/takusemba.m3u8 RTMP HLS

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Media streaming on Android https://github.com/takusemba https://twitter.com/takusemba