esp-idf/examples/bluetooth/bluedroid/classic_bt/common

COMMON CODE

This folder provides the universal code for classic Bluetooth applications, and corresponding functions can be achieved by combining different parts.

File Tree

The file tree of this folder is shown below.

• The a2dp_utils folder contains the files of A2DP including a2dp_sink_common_utils, a2dp_sink_ext_codec_utils and a2dp_sink_int_codec_utils related files. The a2dp_sink_common_utils folder is about common handle function for A2DP sink event. The a2dp_sink_ext_codec_utils folder is about external codec of audio data. The a2dp_sink_int_codec_utils folder is about internal codec of audio data.
• The avrcp_utils folder contains the files of AVRCP including avrcp_abs_vol_utils, avrcp_common_utils, avrcp_cover_art_utils and avrcp_metadata_utils related files. The avrcp_abs_vol_utils folder is about AVRCP absolute volume control event. The avrcp_common_utils folder is about common handle function for AVRCP event. The avrcp_cover_art_utils folder is about AVRCP cover art event. The avrcp_metadata_utils folder is about AVRCP metadata event.
• The bredr_app_common_utils folder contains the files of Classic Bluetooth common code including Classic Bluetooth common initialization and handle function about GAP and device.
• The bt_app_core_utils folder contains the program core files.

└── common
    ├── a2dp_utils
    │   ├── a2dp_sink_common_utils
    │   ├── a2dp_sink_ext_codec_utils
    │   └── a2dp_sink_int_codec_utils
    ├── avrcp_utils
    │   ├── avrcp_abs_vol_utils
    │   ├── avrcp_common_utils
    │   ├── avrcp_cover_art_utils
    │   └── avrcp_metadata_utils
    ├── bredr_app_common_utils
    ├── bt_app_core_utils
    └── README.md

How to use

The functional framework diagram is shown below. The bt_app_core_utils is responsible for all event scheduling. Specific functions can be implemented by general code combined with unique code. For instance, the internal decoding audio output of A2DP sink can be achieved through components such as bredr_app_common_utils, a2dp_sink_common_utils, and a2dp_sink_int_codec_utils. On this basis, adding the code avrcp_common_utils and avrcp_abs_vol_utils can enable volume adjustment, or incorporating avrcp_common_utils and avrcp_metadata_utils can facilitate the transmission of metadata.

+---------------------------------------------------+---------------------+
|      AVRCP feature(avrcp_utils/unique code)       |                     |
+-------------------------+-------------------------+                     |
|a2dp_sink_int_codec_utils|a2dp_sink_ext_codec_utils|                     |
+-------------------------+-------------------------+  bt_app_core_utils  |
|               a2dp_sink_common_utils              |                     |
+---------------------------------------------------+                     |
|               bredr_app_common_utils              |                     |
+---------------------------------------------------+---------------------+