Defines AUDIO_CODEC_TYPE and the codec-agnostic AudioCodecApi (open/close/ read/write/volume/mute/native-rate/native-channels/capabilities) that every audio codec driver in this repo implements (ES8311, ES8388, ES7210, AW88298, the dummy I2S amps, the PDM mic). This is intentionally low-level: no resampling or mixing, one codec device per chip. Most app code should go through audio_stream (see Drivers/audio-stream-module) instead of talking to a codec device directly.

Also provides audio_codec_adapters.h: glue that lets a codec driver build an esp_codec_dev control/data/GPIO interface (audio_codec_ctrl_if_t / audio_codec_data_if_t / audio_codec_gpio_if_t) directly from Tactility's own I2C controller, I2S controller, and GPIO pin devices, so a codec driver only ever needs device_get_parent()/device_find_by_name() plus a handful of devicetree properties -- it never touches the platform I2C/I2S/GPIO APIs directly.

License: Apache v2.0