Add codec control to get CDEF strengths for LUMA

Manually tested with aomenc

Bug: b/283122279
Change-Id: I3045c5de257026879a8c14c28fa5d83a986d4fac

aom/aomcx.h

diff --git a/aom/aomcx.h b/aom/aomcx.h
index 8887e9a..783f56a 100644
--- a/aom/aomcx.h
+++ b/aom/aomcx.h
@@ -1513,6 +1513,11 @@
    */
   AV1E_SET_RATE_DISTRIBUTION_INFO = 161,
 
+  /*!\brief Codec control to get the CDEF strength for Y / luma plane.
+   * Returns an array of CDEF_MAX_STRENGTHS.
+   */
+  AV1E_GET_LUMA_CDEF_STRENGTH = 162,
+
   // Any new encoder control IDs should be added above.
   // Maximum allowed encoder control ID is 229.
   // No encoder control ID should be added below.
@@ -2152,6 +2157,9 @@
 AOM_CTRL_USE_TYPE(AV1E_SET_RATE_DISTRIBUTION_INFO, const char *)
 #define AOM_CTRL_AV1E_SET_RATE_DISTRIBUTION_INFO
 
+AOM_CTRL_USE_TYPE(AV1E_GET_LUMA_CDEF_STRENGTH, int *)
+#define AOM_CTRL_AV1E_GET_LUMA_CDEF_STRENGTH
+
 /*!\endcond */
 /*! @} - end defgroup aom_encoder */
 #ifdef __cplusplus

av1/av1_cx_iface.c

diff --git a/av1/av1_cx_iface.c b/av1/av1_cx_iface.c
index 3b62e00..c469ad5 100644
--- a/av1/av1_cx_iface.c
+++ b/av1/av1_cx_iface.c
@@ -4178,6 +4178,16 @@
   return AOM_CODEC_OK;
 }
 
+static aom_codec_err_t ctrl_get_luma_cdef_strength(aom_codec_alg_priv_t *ctx,
+                                                   va_list args) {
+  int *arg = va_arg(args, int *);
+  AV1_COMMON const *cm = &ctx->ppi->cpi->common;
+  if (arg == NULL) return AOM_CODEC_INVALID_PARAM;
+  memcpy(arg, cm->cdef_info.cdef_strengths, CDEF_MAX_STRENGTHS * sizeof(*arg));
+
+  return AOM_CODEC_OK;
+}
+
 static aom_codec_ctrl_fn_map_t encoder_ctrl_maps[] = {
   { AV1_COPY_REFERENCE, ctrl_copy_reference },
   { AOME_USE_REFERENCE, ctrl_use_reference },
@@ -4336,6 +4346,7 @@
   { AV1E_GET_BASELINE_GF_INTERVAL, ctrl_get_baseline_gf_interval },
   { AV1E_GET_TARGET_SEQ_LEVEL_IDX, ctrl_get_target_seq_level_idx },
   { AV1E_GET_NUM_OPERATING_POINTS, ctrl_get_num_operating_points },
+  { AV1E_GET_LUMA_CDEF_STRENGTH, ctrl_get_luma_cdef_strength },
 
   CTRL_MAP_END,
 };