Performance presets

[jlucidar]

As discussed in #16 and #43, performance of the streaming is not consistent across all device.

Having a way to choose different performance presets in the settings would help people find the right balance between latency and stability.

Here is the preset list I think might be relevant :

• default

  MAX_SYNC_FRAME_SIZE = 131072
  sampleTime = 10000
  minBufferMs = 500
  maxBufferMs = 2000
  bufferForPlaybackMs = 17
  bufferForPlaybackAfterRebufferMs = 17

• conservative

  MAX_SYNC_FRAME_SIZE = 131072
  sampleTime = 14000
  minBufferMs = 500
  maxBufferMs = 2000
  bufferForPlaybackMs = 34
  bufferForPlaybackAfterRebufferMs = 34

• aggressive

  MAX_SYNC_FRAME_SIZE = 131072
  sampleTime = 9000
  minBufferMs = 500
  maxBufferMs = 2000
  bufferForPlaybackMs = 10
  bufferForPlaybackAfterRebufferMs = 10

• legacy (might need to reimplement circular buffering to work)

  MAX_SYNC_FRAME_SIZE = 30720
  sampleTime = 200
  minBufferMs = 32768
  maxBufferMs = 65536
  bufferForPlaybackMs = 0
  bufferForPlaybackAfterRebufferMs = 0

[jlucidar]

It's been merged !