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managed_components/espressif__esp-sr/include/esp32s2/esp_afe_aec.h

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+
+#ifndef _ESP_AFE_AEC_H_
+#define _ESP_AFE_AEC_H_
+
+#include "esp_aec.h"
+#include "esp_afe_config.h"
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+    aec_handle_t *handle;
+    aec_mode_t mode;
+    afe_pcm_config_t pcm_config;
+    int frame_size;
+    int16_t *data;
+} afe_aec_handle_t;
+
+/**
+ * @brief Creates an instance to the AEC structure.
+ *
+ * @warning Currently only support 1 microphone channel and 1 playback channe.
+ * If input has multiple microphone channels and playback channels, just the first microphone channel and playback
+ * channel will be selected.
+ *
+ * The input format, same as afe config:
+ * M to represent the microphone channel
+ * R to represent the playback reference channel
+ * N to represent an unknown or unused channel
+ *
+ * For example, input_format="MMNR" indicates that the input data consists of four channels,
+ * which are the microphone channel, the microphone channel, an unused channel, and the playback channel
+ *
+ * @param input_format     The input format
+ * @param filter_length    The length of filter. The larger the filter, the higher the CPU loading.
+ *                         Recommended filter_length = 4 for esp32s3 and esp32p4. Recommended filter_length = 2 for
+ * esp32c5.
+ * @param type             The type of afe, AFE_TYPE_SR or AFE_TYPE_VC
+ * @param mode             The mode of afe, AFE_MODE_LOW_COST or AFE_MODE_HIGH_PERF
+ *
+ * @return afe_config_t*  The default config of afe
+ */
+afe_aec_handle_t *afe_aec_create(const char *input_format, int filter_length, afe_type_t type, afe_mode_t mode);
+
+/**
+ * @brief Performs echo cancellation a frame, based on the audio sent to the speaker and frame from mic.
+ *
+ * @param inst        The instance of AEC.
+ * @param indata      Input audio data, format is define by input_format.
+ * @param outdata     Near-end signal with echo removed.  outdata must be 16-bit aligned.
+ *                    please use heap_caps_aligned_calloc(16, n, size, caps) to allocate an aligned chunk of memory
+
+ * @return The bytes of outdata.
+ */
+size_t afe_aec_process(afe_aec_handle_t *handel, const int16_t *indata, int16_t *outdata);
+
+/**
+ * @brief Get frame size of AEC (the samples of one frame)
+ * @param handle The instance of AEC.
+ * @return Frame size
+ */
+int afe_aec_get_chunksize(afe_aec_handle_t *handle);
+
+/**
+ * @brief Free the AEC instance
+ *
+ * @param inst The instance of AEC.
+ *
+ * @return None
+ *
+ */
+void afe_aec_destroy(afe_aec_handle_t *handel);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //_ESP_AEC_H_