Bluetooth: Audio: Shell: Add SBC encoded audio

Add code to use shell application to test A2DP
profile with option to use SBC encoded audio. Add
sine tone audio file which will be used to render
to encoded audio A2DP sink device. There is an
kconfig option to enable/disable encoded audio
support

Signed-off-by: Vinit Mehta <vinit.mehta@nxp.com>

Author: VinitMehta7492

include/zephyr/bluetooth/classic/a2dp_codec_sbc.h

@@ -111,6 +111,14 @@ struct bt_a2dp_codec_sbc_params {
  */
 uint8_t bt_a2dp_sbc_get_channel_num(struct bt_a2dp_codec_sbc_params *sbc_codec);
 
+/** @brief get channel mode of a2dp sbc config.
+ *
+ *  @param sbc_codec The a2dp sbc parameter.
+ *
+ *  @return the channel mode.
+ */
+enum sbc_ch_mode bt_a2dp_sbc_get_channel_mode(struct bt_a2dp_codec_sbc_params *sbc_codec);
+
 /** @brief get sample rate of a2dp sbc config.
  *
  *  @param sbc_codec The a2dp sbc parameter.
@@ -119,6 +127,30 @@ uint8_t bt_a2dp_sbc_get_channel_num(struct bt_a2dp_codec_sbc_params *sbc_codec);
  */
 uint32_t bt_a2dp_sbc_get_sampling_frequency(struct bt_a2dp_codec_sbc_params *sbc_codec);
 
+/** @brief get subband num of a2dp sbc config.
+ *
+ *  @param sbc_codec The a2dp sbc parameter.
+ *
+ *  @return the subband num.
+ */
+uint8_t bt_a2dp_sbc_get_subband_num(struct bt_a2dp_codec_sbc_params *sbc_codec);
+
+/** @brief get block length of a2dp sbc config.
+ *
+ *  @param sbc_codec The a2dp sbc parameter.
+ *
+ *  @return the block length.
+ */
+uint8_t bt_a2dp_sbc_get_block_length(struct bt_a2dp_codec_sbc_params *sbc_codec);
+
+/** @brief get allocation method of a2dp sbc config.
+ *
+ *  @param sbc_codec The a2dp sbc parameter.
+ *
+ *  @return the allocation method.
+ */
+enum sbc_alloc_mthd bt_a2dp_sbc_get_allocation_method(struct bt_a2dp_codec_sbc_params *sbc_codec);
+
 #ifdef __cplusplus
 }
 #endif

subsys/bluetooth/host/classic/Kconfig

@@ -478,6 +478,25 @@ config BT_A2DP_SINK
 	help
 	  This option enables the A2DP profile sink function
 
+config BT_A2DP_SOURCE_DISCOVER_RESULT_COUNT
+	int "Maximum result count per device discovery"
+	default 10
+
+config BT_A2DP_SOURCE_EPS_DISCOVER_COUNT
+	int "Maximum result count per a2dp endpoint discovery"
+	default 10
+
+config BT_A2DP_SOURCE_SBC_BIT_RATE_DEFAULT
+	int "default sbc bit rate"
+	default 229
+
+config BT_A2DP_SOURCE_DATA_SEND_INTERVAL
+	int "data send interval (ms)"
+	default 20
+
+config BT_A2DP_SOURCE_DATA_BUF_SIZE
+	int "data buffer size (bytes)"
+	default 1000
 endif # BT_A2DP
 
 config BT_AVCTP
@@ -617,6 +636,15 @@ config BT_OEBX_RSP_CODE_TO_STR
 
 endif # BT_GOEP
 
+config BT_A2DP_SOURCE_SBC_AUDIO_SHELL
+	bool "A2DP Source SBC Audio Shell Support"
+	depends on BT_A2DP_SOURCE && SHELL
+	default n
+	help
+	  Enable A2DP source SBC audio encoding and playback functionality
+	  in the shell. This includes SBC encoder support, audio streaming,
+	  and related shell commands for testing A2DP source functionality.
+
 endif # BT_CLASSIC
 
 endmenu

subsys/bluetooth/host/classic/a2dp_codec_sbc.c

@@ -14,7 +14,7 @@
 
 #include <zephyr/bluetooth/classic/a2dp_codec_sbc.h>
 #include <zephyr/bluetooth/classic/a2dp.h>
-
+#include <zephyr/libsbc/sbc.h>
 
 uint8_t bt_a2dp_sbc_get_channel_num(struct bt_a2dp_codec_sbc_params *sbc_codec)
 {
@@ -33,6 +33,23 @@ uint8_t bt_a2dp_sbc_get_channel_num(struct bt_a2dp_codec_sbc_params *sbc_codec)
 	}
 }
 
+enum sbc_ch_mode bt_a2dp_sbc_get_channel_mode(struct bt_a2dp_codec_sbc_params *sbc_codec)
+{
+	__ASSERT_NO_MSG(sbc_codec != NULL);
+
+	if (sbc_codec->config[0] & A2DP_SBC_CH_MODE_MONO) {
+		return SBC_CH_MODE_MONO;
+	} else if (sbc_codec->config[0] & A2DP_SBC_CH_MODE_DUAL) {
+		return SBC_CH_MODE_DUAL_CHANNEL;
+	} else if (sbc_codec->config[0] & A2DP_SBC_CH_MODE_STEREO) {
+		return SBC_CH_MODE_STEREO;
+	} else if (sbc_codec->config[0] & A2DP_SBC_CH_MODE_JOINT) {
+		return SBC_CH_MODE_JOINT_STEREO;
+	} else {
+		return SBC_CH_MODE_MONO;
+	}
+}
+
 uint32_t bt_a2dp_sbc_get_sampling_frequency(struct bt_a2dp_codec_sbc_params *sbc_codec)
 {
 	__ASSERT_NO_MSG(sbc_codec != NULL);
@@ -49,3 +66,44 @@ uint32_t bt_a2dp_sbc_get_sampling_frequency(struct bt_a2dp_codec_sbc_params *sbc
 		return 0U;
 	}
 }
+
+uint8_t bt_a2dp_sbc_get_subband_num(struct bt_a2dp_codec_sbc_params *sbc_codec)
+{
+	__ASSERT_NO_MSG(sbc_codec != NULL);
+
+	if (sbc_codec->config[1] & A2DP_SBC_SUBBAND_4) {
+		return 4U;
+	} else if (sbc_codec->config[1] & A2DP_SBC_SUBBAND_8) {
+		return 8U;
+	} else {
+		return 0U;
+	}
+}
+
+uint8_t bt_a2dp_sbc_get_block_length(struct bt_a2dp_codec_sbc_params *sbc_codec)
+{
+	__ASSERT_NO_MSG(sbc_codec != NULL);
+
+	if (sbc_codec->config[1] & A2DP_SBC_BLK_LEN_4) {
+		return 4U;
+	} else if (sbc_codec->config[1] & A2DP_SBC_BLK_LEN_8) {
+		return 8U;
+	} else if (sbc_codec->config[1] & A2DP_SBC_BLK_LEN_12) {
+		return 12U;
+	} else if (sbc_codec->config[1] & A2DP_SBC_BLK_LEN_16) {
+		return 16U;
+	} else {
+		return 0U;
+	}
+}
+
+enum sbc_alloc_mthd bt_a2dp_sbc_get_allocation_method(struct bt_a2dp_codec_sbc_params *sbc_codec)
+{
+	__ASSERT_NO_MSG(sbc_codec != NULL);
+
+	if (sbc_codec->config[1] & A2DP_SBC_ALLOC_MTHD_SNR) {
+		return SBC_ALLOC_MTHD_SNR;
+	} else {
+		return SBC_ALLOC_MTHD_LOUDNESS;
+	}
+}