MPEG-2,4 AAC Support

This section describes A2DP MPEG-2,4 AAC Audio codec API. More...

Data Structures
struct	wiced_bt_a2d_m24_cie_t
	data type for the MPEG-2, 4 AAC Codec Information Element More...

Macros
#define	A2D_M24_INFO_LEN   8
	the LOSC of MPEG_2, 4 AAC media codec capabilitiy
#define	A2D_M24_IE_VBR_MSK   0x80
	b7: VBR

Functions
wiced_bt_a2d_status_t	wiced_bt_a2d_bld_m24info (uint8_t media_type, wiced_bt_a2d_m24_cie_t *p_ie, uint8_t *p_result)
	This function is called by an application to build the MPEG-2, 4 AAC Media Codec Capabilities byte sequence beginning from the LOSC octet. More...
wiced_bt_a2d_status_t	wiced_bt_a2d_pars_m24info (wiced_bt_a2d_m24_cie_t *p_ie, uint8_t *p_info, wiced_bool_t for_caps)
	This function is called by an application to parse the MPEG-2, 4 AAC Media Codec Capabilities byte sequence beginning from the LOSC octet. More...

MPEG-2,4 AAC Object
for Codec Specific Information Element
#define	A2D_M24_IE_OBJ_MSK   0xF0
	b7-b4 object type. More...
#define	A2D_M24_IE_OBJ_2LC   0x80
	b7: MPEG-2 AAC LC
#define	A2D_M24_IE_OBJ_4LC   0x40
	b6: MPEG-4 AAC LC
#define	A2D_M24_IE_OBJ_4LTP   0x20
	b5: MPEG-4 AAC LTP
#define	A2D_M24_IE_OBJ_4S   0x10
	b4: MPEG-4 AAC scalable

MPEG-2,4 AAC Sampling Frequency
#define	A2D_M24_IE_SAMP_FREQ_MSK   0xFFF0
	sampling frequency
#define	A2D_M24_IE_SAMP_FREQ_8   0x8000
	b7:8 kHz
#define	A2D_M24_IE_SAMP_FREQ_11   0x4000
	b6:11 kHz
#define	A2D_M24_IE_SAMP_FREQ_12   0x2000
	b5:12 kHz
#define	A2D_M24_IE_SAMP_FREQ_16   0x1000
	b4:16 kHz
#define	A2D_M24_IE_SAMP_FREQ_22   0x0800
	b3:22.05kHz
#define	A2D_M24_IE_SAMP_FREQ_24   0x0400
	b2:24 kHz
#define	A2D_M24_IE_SAMP_FREQ_32   0x0200
	b1:32 kHz
#define	A2D_M24_IE_SAMP_FREQ_44   0x0100
	b0:44.1kHz
#define	A2D_M24_IE_SAMP_FREQ_48   0x0080
	b7:48 kHz
#define	A2D_M24_IE_SAMP_FREQ_64   0x0040
	b6:64 kHz
#define	A2D_M24_IE_SAMP_FREQ_88   0x0020
	b5:88 kHz
#define	A2D_M24_IE_SAMP_FREQ_96   0x0010
	b4:96 kHz

MPEG-2,4 AAC Channel
#define	A2D_M24_IE_CHNL_MSK   0x0C
	b3-b2 channels
#define	A2D_M24_IE_CHNL_1   0x08
	b3: 1 channel
#define	A2D_M24_IE_CHNL_2   0x04
	b2: 2 channels

MPEG-2,4 AAC Bitrate
#define	A2D_M24_IE_BITRATE3_MSK   0x7F0000
	octect3
#define	A2D_M24_IE_BITRATE45_MSK   0x00FFFF
	octect4, 5
#define	A2D_M24_IE_BITRATE_MSK   0x7FFFFF
	b7-b0 of octect 3, all of octect4, 5

Detailed Description

This section describes A2DP MPEG-2,4 AAC Audio codec API.

Macro Definition Documentation

#define A2D_M24_IE_OBJ_MSK   0xF0

b7-b4 object type.

b3-b0 is RFA,not used

Function Documentation

wiced_bt_a2d_status_t wiced_bt_a2d_bld_m24info	(	uint8_t	media_type,
		wiced_bt_a2d_m24_cie_t *	p_ie,
		uint8_t *	p_result
	)

This function is called by an application to build the MPEG-2, 4 AAC Media Codec Capabilities byte sequence beginning from the LOSC octet.

Parameters

[in]	media_type	: Indicates Audio, or Multimedia.
[in]	p_ie	: MPEG-2, 4 AAC Codec Information Element information.
[out]	p_result	: the resulting codec info byte sequence.

Returns

A2D_SUCCESS if function execution succeeded.
Error status code , otherwise.

wiced_bt_a2d_status_t wiced_bt_a2d_pars_m24info	(	wiced_bt_a2d_m24_cie_t *	p_ie,
		uint8_t *	p_info,
		wiced_bool_t	for_caps
	)

This function is called by an application to parse the MPEG-2, 4 AAC Media Codec Capabilities byte sequence beginning from the LOSC octet.

Parameters

[in]	p_info	: the byte sequence to parse.
[in]	for_caps	: TRUE, if the byte sequence is for get capabilities response.
[out]	p_ie	: MPEG-2, 4 AAC Codec Information Element information.

Returns

A2D_SUCCESS if function execution succeeded.
Error status code , otherwise.