Adaptive bitrate streaming and jitter buffer.

Monitors network conditions and dynamically adjusts:

• Video resolution and bitrate
• Buffer size
• Frame dropping strategy

Borrowed from WebRTC / RTP / QUIC approaches.

States

:stable     → network is good, use highest quality
:degrading  → packet loss detected, reduce quality
:recovering → network improving, slowly ramp up
:buffered   → buffer full, can increase quality

Example

{:ok, adapter} = Dala.Media.Adaptive.start_link(%{
  min_bitrate: 200_000,
  max_bitrate: 4_000_000,
  target_buffer_ms: 2000
})

# Report network stats (called by stream decoder)
Dala.Media.Adaptive.report_stats(adapter, %{
  bytes_received: 50000,
  packets_lost: 2,
  jitter_ms: 15,
  rtt_ms: 80
})