Move AEC3 configuration to its own file under api/audio

This is one of several small steps of separating APM and AEC3.

Bug: webrtc:8844
Change-Id: Ib6e518fec5f7566cab3823ab35fcede8433f8f4e
Reviewed-on: https://webrtc-review.googlesource.com/53142
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Per Åhgren <peah@webrtc.org>
Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22028}

modules/audio_processing/include/audio_processing.h

@@ -22,6 +22,7 @@
 #include <string.h>
 #include <vector>
 
+#include "api/audio/echo_canceller3_config.h"
 #include "api/optional.h"
 #include "modules/audio_processing/beamformer/array_util.h"
 #include "modules/audio_processing/include/audio_processing_statistics.h"
@@ -1161,98 +1162,6 @@ class VoiceDetection {
   virtual ~VoiceDetection() {}
 };
 
-// Configuration struct for EchoCanceller3
-struct EchoCanceller3Config {
-  struct Delay {
-    size_t default_delay = 5;
-    size_t down_sampling_factor = 4;
-    size_t num_filters = 4;
-    size_t api_call_jitter_blocks = 26;
-    size_t min_echo_path_delay_blocks = 0;
-    size_t delay_headroom_blocks = 2;
-    size_t hysteresis_limit_1_blocks = 1;
-    size_t hysteresis_limit_2_blocks = 1;
-  } delay;
-
-  struct Filter {
-    struct MainConfiguration {
-      size_t length_blocks;
-      float leakage_converged;
-      float leakage_diverged;
-      float error_floor;
-      float noise_gate;
-    };
-
-    struct ShadowConfiguration {
-      size_t length_blocks;
-      float rate;
-      float noise_gate;
-    };
-
-    MainConfiguration main = {13, 0.005f, 0.1f, 0.001f, 20075344.f};
-    ShadowConfiguration shadow = {13, 0.7f, 20075344.f};
-
-    MainConfiguration main_initial = {12, 0.05f, 5.f, 0.001f, 20075344.f};
-    ShadowConfiguration shadow_initial = {12, 0.9f, 20075344.f};
-  } filter;
-
-  struct Erle {
-    float min = 1.f;
-    float max_l = 8.f;
-    float max_h = 1.5f;
-  } erle;
-
-  struct EpStrength {
-    float lf = 10.f;
-    float mf = 10.f;
-    float hf = 10.f;
-    float default_len = 0.f;
-    bool echo_can_saturate = true;
-    bool bounded_erl = false;
-  } ep_strength;
-
-  struct Mask {
-    float m1 = 0.01f;
-    float m2 = 0.0001f;
-    float m3 = 0.01f;
-    float m4 = 0.1f;
-    float m5 = 0.1f;
-    float m6 = 0.0001f;
-    float m7 = 0.01f;
-    float m8 = 0.0001f;
-    float m9 = 0.1f;
-  } gain_mask;
-
-  struct EchoAudibility {
-    float low_render_limit = 4 * 64.f;
-    float normal_render_limit = 64.f;
-  } echo_audibility;
-
-  struct RenderLevels {
-    float active_render_limit = 100.f;
-    float poor_excitation_render_limit = 150.f;
-  } render_levels;
-
-  struct GainUpdates {
-    struct GainChanges {
-      float max_inc;
-      float max_dec;
-      float rate_inc;
-      float rate_dec;
-      float min_inc;
-      float min_dec;
-    };
-
-    GainChanges low_noise = {2.f, 2.f, 1.4f, 1.4f, 1.1f, 1.1f};
-    GainChanges initial = {2.f, 2.f, 1.5f, 1.5f, 1.2f, 1.2f};
-    GainChanges normal = {2.f, 2.f, 1.5f, 1.5f, 1.2f, 1.2f};
-    GainChanges saturation = {1.2f, 1.2f, 1.5f, 1.5f, 1.f, 1.f};
-    GainChanges nonlinear = {1.5f, 1.5f, 1.2f, 1.2f, 1.1f, 1.1f};
-
-    float floor_first_increase = 0.00001f;
-  } gain_updates;
-};
-
 class EchoCanceller3Factory : public EchoControlFactory {
  public:
   EchoCanceller3Factory();