- directly write i2s from sync task
o use DMA events to ensure buffer is empty on hard sync
- add i2s playback task
o try synced playback using i2s DMA events and task notifications
- drop short latency buffers
- change syncing to be more predictable using I2S_EVENT_TX_DONE
o also increase DMA length so i2s won't eat up so much processing time
o ensure at least one chunk is in DMA buffer
- add WIFI provisioning using Soft AP
- remove bug in server_now() leading to occasional unneccessary hard resyncs
- use shortMedianFilter to decide about hard resync condition
- drop ADF pipeline stuff related to playback, this introduced too much non deterministic delay
- add fast median calculation component
- increase LWIP buffers
- do apll change only when current setting is different than the wanted one
- improve snapcast_sync_task
- add esp timer to issue time sync messages to server every second
o block on semaphore which is given in timer callback
- start dropping adf piplines for decoding wirechunk part of code
o use write callback for output
o TODO: use read callback for input
- move time stamping of pcm chunks to decoder's write callback
- try to improve synced playback using APLL adjustments
- reduce diffBuf size to 1, bigger values seem to be problematic if packet loss is happening, maybe we need to detect this and clear diffBuf
- do early time syncs on boot to fill diffBuf
- playing with pipline ringbuf sizes and I2S DMA buffer sizes
- do some cosmetics
- improve server now generation
- improve playback synchronization
o use two audio pipelines so we can tap into decoded audio and apply collected timestamps from encoded chunks to PCM chunks in decoder write callback
o do hard synchronization on PCM stream and then start playback
o TODO: sample stuffing/skipping to keep a good sync
o TODO: for some reason playback hangs after a while on timestampQueue write
- use espressif ADF, remove external opus rep
o uses audio pipelines now
- change code to use flac decoder
- remove mersus code
- add first try of audio synchronization
o needed to sync timeofday to server on reception of server settings to avoid overflows in timeval calculations (int32_t on esp32 SDK)
o still a lot of TODO's in the code, but it's almost in sync, although there is quite some chunk skipping which I am currently working on
