Feature/aec erle

[Allan-xmos]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces ERLE (Echo Return Loss Enhancement) based adaptation control and reference activity detection to the AEC algorithm, along with refactoring of AGC meta-data initialization and various fixes.

Key changes:

• Adds ERLE calculation and moving average tracking to control filter adaptation alongside coherence
• Introduces ref_active_flag to track reference signal activity across the system
• Refactors AGC meta-data initialization to use a new agc_meta_data_init() helper function
• Updates configuration parameters including coherence thresholds and timer behavior
• Fixes logic bugs in L2 unification and test parsing

Reviewed Changes

Copilot reviewed 34 out of 34 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
modules/lib_aec/api/aec_state.h	Adds ERLE fields to coherence_mu_params_t, ref_active_flag and overall_Yhat to shared state, removes x_energy_thresh
modules/lib_aec/src/aec_priv_impl.c	Implements aec_priv_calc_erle(), updates calc_coherence_mu logic with ERLE and ref_active_flag, changes coherence threshold values
modules/lib_aec/src/aec_priv.h	Adds function declarations for new ERLE calculation and updated signatures
modules/lib_aec/src/aec_impl.c	Integrates ERLE calculation into filter comparison workflow
modules/lib_aec/src/aec_l2_impl.c	Simplifies conditional logic in bfp_s32_unify_exponent
modules/lib_agc/api/agc_api.h	Adds agc_meta_data_init() declaration, AGC_META_DATA_NO_REF define, updates documentation
modules/lib_agc/src/agc_impl.c	Implements agc_meta_data_init() function
examples/bare-metal//src/.c	Updates to use agc_meta_data_init() and set ref_active_flag
test/lib_agc/test_process_frame/src/*.c	Replaces manual meta-data initialization with agc_meta_data_init()
test/lib_aec/aec_unit_tests/src/*.c	Updates test reference models with ERLE calculation and ref_active_flag handling
test/lib_aec/aec_unit_tests/conftest.py	Fixes test output parsing to handle lines prefixed with 'C:'
test/lib_aec/aec_unit_tests/CMakeLists.txt	Adds XMATH_BFP_DEBUG_CHECK_LENGTHS flag
test/pipeline/py_pipeline/config/prev_arch.json	Updates configuration with new parameters
Jenkinsfile	Archives output wav files from bare-metal examples

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[Allan-xmos]

Make this into 4 tasks or 2 tasks

[Allan-xmos]

Move this inside stage 1, init as -1