Experiments to port libopus encode/decoder to esp32

Original sources by the authors of Opus: http://opus-codec.org

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First benchmark: Encode Sample16kHz.raw (little-endian) data, 16 bit, stereo 16000 Hz 10 seconds It's still missing the ogg part !!!!

1. Without CFLAGS:

9746146 microseconds

2. Without CFLAGS and FIXED_POINT:

8185269 microseconds

3. Without CFLAGS and release mode:

8970423 microseconds

So, the best option is (2): 1,22 realtime.

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TODO:

• Create ogg part
• Encode something infinite to check memory leaks
• Profile to find the heaviest parts
• Investigate esp32 dsp features: Vectra LX DSP Engine, MAC16
• Streaming over tcp and http

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