> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs-staging.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# APTX Adaptive Encoder API

**Header:** `spf/api/modules/aptx_adaptive_encoder_api.h`

## Structures

### `param_id_aptx_adaptive_enc_init_t`

**Members**

<ParamField path="sampleRate" type="uint32_t" />

<ParamField path="mtulink0" type="uint32_t">
  A value of 0 means "do not change"}
</ParamField>

<ParamField path="channelMode0" type="int32_t" />

<ParamField path="minsinkBufLL" type="uint32_t" />

<ParamField path="maxsinkBufLL" type="uint32_t" />

<ParamField path="minsinkBufHQ" type="uint32_t" />

<ParamField path="maxsinkBufHQ" type="uint32_t" />

<ParamField path="minsinkBufTws" type="uint32_t" />

<ParamField path="maxsinkBufTws" type="uint32_t">
  the A2DP Sink can accept.
</ParamField>

<ParamField path="profile" type="uint32_t" />

<ParamField path="twsplusDualMonoMode" type="uint32_t" />

<ParamField path="twsplusFadeDuration" type="uint32_t" />

<ParamField path="sinkCapability" type="uint8_t">
  }
</ParamField>

### `param_id_aptx_adaptive_enc_profile_t`

**Members**

<ParamField path="primprofile" type="uint32_t" />

<ParamField path="secprofile" type="uint32_t" />

<ParamField path="LLModeLatTarget0" type="uint32_t">
  Each bit represents 1mS of audio.
  A value of 0 means 'do not change'}
</ParamField>

<ParamField path="LLModeLatTarget1" type="uint32_t">
  Each bit represents 1mS of audio.
  A value of 0 means 'do not change'}
</ParamField>

<ParamField path="hQLatTarget0" type="uint32_t">
  Each bit represents 4mS of audio.
  A value of 0 means 'do not change'}
</ParamField>

<ParamField path="hQLatTarget1" type="uint32_t">
  Each bit represents 4mS of audio.
  A value of 0 means 'do not change'}
</ParamField>

### `param_id_aptx_adaptive_enc_original_samplerate_t`

**Members**

<ParamField path="original_sample_rate" type="uint16_t">
  }
</ParamField>

### `param_id_aptx_adaptive_enc_switch_to_mono_t`

**Members**

<ParamField path="switch_between_mono_and_stereo" type="uint32_t">
  }
</ParamField>

## Type Definitions

### `param_id_aptx_adaptive_enc_init_t`

```cpp theme={null}
typedef struct param_id_aptx_adaptive_enc_init_t param_id_aptx_adaptive_enc_init_t
```

### `param_id_aptx_adaptive_enc_profile_t`

```cpp theme={null}
typedef struct param_id_aptx_adaptive_enc_profile_t param_id_aptx_adaptive_enc_profile_t
```

### `param_id_aptx_adaptive_enc_original_samplerate_t`

```cpp theme={null}
typedef struct param_id_aptx_adaptive_enc_original_samplerate_t param_id_aptx_adaptive_enc_original_samplerate_t
```

### `param_id_aptx_adaptive_enc_switch_to_mono_t`

```cpp theme={null}
typedef struct param_id_aptx_adaptive_enc_switch_to_mono_t param_id_aptx_adaptive_enc_switch_to_mono_t
```

## Macros

### `COP_ENCODER_FEEDBACK_IN`

```c theme={null}
#define COP_ENCODER_FEEDBACK_IN AR_NON_GUID(0xC0000001)
```

### `SINK_CAPABILITIES_LEN`

```c theme={null}
#define SINK_CAPABILITIES_LEN 11
```

### `PARAM_ID_APTX_ADAPTIVE_ENC_INIT`

ID of the aptx adaptive encoder initialization parameter.

```c theme={null}
#define PARAM_ID_APTX_ADAPTIVE_ENC_INIT 0x08001183
```

### `PARAM_ID_APTX_ADAPTIVE_ENC_PROFILE`

ID of the aptx adaptive encoder profile parameter.

```c theme={null}
#define PARAM_ID_APTX_ADAPTIVE_ENC_PROFILE 0x08001184
```

### `PARAM_ID_APTX_ADAPTIVE_ENC_AUDIOSRC_INFO`

ID of the aptx adaptive encoder Source Audio sample rate parameter.

```c theme={null}
#define PARAM_ID_APTX_ADAPTIVE_ENC_AUDIOSRC_INFO 0x08001186
```

### `PARAM_ID_APTX_ADAPTIVE_ENC_SWITCH_TO_MONO`

ID of the aptx adaptive encoder Source Audio sample rate parameter.

```c theme={null}
#define PARAM_ID_APTX_ADAPTIVE_ENC_SWITCH_TO_MONO 0x08001187
```

### `MODULE_ID_APTX_ADAPTIVE_ENC`

```c theme={null}
#define MODULE_ID_APTX_ADAPTIVE_ENC 0x07001082
```