Implement multiple audio tracks support for local media stream

[xiangchun]

I checked ExoPlayer, it implements MultiTrackChunkSource to support multiple audio tracks on master branch.
But how to implement multiple audio tracks support for local media stream, for example, I have a stream which contains :

General
Unique ID : 251352275511766917962423227176409075865 (0xBD18AFF96EE4BCA592507D6EF40F9099)
Complete name : D:\media\multi-audio-subtitle\MKV_MPEG2_Main@High_1920x1080_23.976fps_9audio.mkv
Format : Matroska
Format version : Version 1
File size : 670 MiB
Duration : 2mn 18s
Overall bit rate mode : Variable
Overall bit rate : 40.5 Mbps
Encoded date : UTC 2009-03-31 04:01:03
Writing application : mkvmerge v2.6.0 ('Kelly watch the Stars') built on Mar 24 2009 15:23:17
Writing library : libebml v0.7.7 + libmatroska v0.8.1

Video
ID : 1
Format : MPEG Video
Format version : Version 2
Format profile : Main@High
Format settings, BVOP : No
Format settings, Matrix : Custom
Codec ID : V_MPEG2
Codec ID/Info : MPEG 1 or 2 Video
Duration : 2mn 18s
Bit rate mode : Variable
Maximum bit rate : 35.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Time code of first frame : 01:02:59:00
Time code source : Group of pictures header
Default : Yes
Forced : No

Audio #1
ID : 2
Format : PCM
Codec ID : A_PCM/INT/LIT
Duration : 2mn 18s
Bit rate mode : Constant
Channel(s) : 6 channels
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Title : PCM
Default : Yes
Forced : No

Audio #2
ID : 3
Format : DTS
Format/Info : Digital Theater Systems
Format profile : MA / Core
Mode : 16
Format settings, Endianness : Big
Codec ID : A_DTS
Duration : 2mn 18s
Bit rate mode : Variable
Bit rate : Unknown / 1 509 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossless / Lossy
Title : DTS
Default : No
Forced : No

Audio #3
ID : 4
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Codec ID : A_AC3
Duration : 2mn 18s
Bit rate mode : Constant
Bit rate : 640 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 10.6 MiB (2%)
Title : AC3
Default : No
Forced : No

Audio #4
ID : 5
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : A_AAC
Duration : 2mn 18s
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Compression mode : Lossy
Title : AACLC
Default : No
Forced : No

Audio #5
ID : 6
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : HE-AAC / LC
Codec ID : A_AAC
Duration : 2mn 18s
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz / 24.0 KHz
Compression mode : Lossy
Title : AACHE
Default : No
Forced : No

Audio #6
ID : 7
Format : FLAC
Format/Info : Free Lossless Audio Codec
Codec ID : A_FLAC
Duration : 2mn 18s
Bit rate mode : Variable
Channel(s) : 6 channels
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Title : FLAC
Writing library : libFLAC 1.1.4 (UTC 2007-02-13)
Default : No
Forced : No

Audio #7
ID : 8
Format : WMA
Format profile : Lossless
Codec ID : A_MS/ACM / 163
Codec ID/Info : Windows Media Audio
Duration : 2mn 18s
Bit rate : 1 152 Kbps
Channel(s) : 6 channels
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 19.0 MiB (3%)
Title : Wma9.2Lossless
Language : English
Default : No
Forced : No

Audio #8
ID : 9
Format : WMA
Format profile : Pro
Codec ID : A_MS/ACM / 162
Codec ID/Info : Windows Media Audio
Duration : 2mn 18s
Bit rate : 768 Kbps
Channel(s) : 6 channels
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 12.7 MiB (2%)
Title : Wma10Pro
Language : English
Default : No
Forced : No

Audio #9
ID : 10
Format : Vorbis
Format settings, Floor : 1
Codec ID : A_VORBIS
Duration : 2mn 18s
Bit rate mode : Variable
Bit rate : 480 Kbps
Channel(s) : 6 channels
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 7.94 MiB (1%)
Title : OGGVorbis
Writing library : libVorbis 1.0 (UTC 2002-07-17)
Default : No
Forced : No

[ojw28]

This is now tracked by #514.