MPEG-1,2 Support

This section describes A2DP MPEG-1,2 Audio codec API. More...

Data Structures
struct	wiced_bt_a2d_m12_cie_t
	data type for the MPEG-1, 2 Audio Codec Information Element More...

Macros
#define	A2D_M12_MPL_HDR_LEN   4
	the length of the MPEG_1, 2 Audio Media Payload header. More...
#define	A2D_M12_INFO_LEN   6
	the LOSC of MPEG_1, 2 Audio media codec capabilitiy
#define	A2D_M12_IE_CRC_MSK   0x10
	b4: CRC
#define	A2D_M12_IE_MPF_MSK   0x40
	b6: MPF
#define	A2D_M12_IE_VBR_MSK   0x80
	b7: VBR
#define	A2D_BLD_M12_PML_HDR(p_dst, frag_offset)
	Build MPEG-1,2 Header. More...
#define	A2D_PARS_M12_PML_HDR(p_src, frag_offset)
	Parse MPEG-1,2 Header. More...

Functions
wiced_bt_a2d_status_t	wiced_bt_a2d_bld_m12info (uint8_t media_type, wiced_bt_a2d_m12_cie_t *p_ie, uint8_t *p_result)
	This function is called by an application to build the MPEG-1, 2 Audio Media Codec Capabilities byte sequence beginning from the LOSC octet. More...
wiced_bt_a2d_status_t	wiced_bt_a2d_pars_m12info (wiced_bt_a2d_m12_cie_t *p_ie, uint8_t *p_info, wiced_bool_t for_caps)
	This function is called by an application to parse the MPEG-1, 2 Audio Media Codec Capabilities byte sequence beginning from the LOSC octet. More...

MPEG-1,2 Layer
for Codec Specific Information Element
#define	A2D_M12_IE_LAYER_MSK   0xE0
	b7-b5 layer
#define	A2D_M12_IE_LAYER1   0x80
	b7: layer1 (mp1)
#define	A2D_M12_IE_LAYER2   0x40
	b6: layer2 (mp2)
#define	A2D_M12_IE_LAYER3   0x20
	b5: layer3 (mp3)

MPEG-1,2 Channel Mode
#define	A2D_M12_IE_CH_MD_MSK   0x0F
	b3-b0 channel mode
#define	A2D_M12_IE_CH_MD_MONO   0x08
	b3: mono
#define	A2D_M12_IE_CH_MD_DUAL   0x04
	b2: dual
#define	A2D_M12_IE_CH_MD_STEREO   0x02
	b1: stereo
#define	A2D_M12_IE_CH_MD_JOINT   0x01
	b0: joint stereo

MPEG-1,2 Sampling Frequency
#define	A2D_M12_IE_SAMP_FREQ_MSK   0x3F
	b5-b0 sampling frequency
#define	A2D_M12_IE_SAMP_FREQ_16   0x20
	b5:16 kHz
#define	A2D_M12_IE_SAMP_FREQ_22   0x10
	b4:22.05kHz
#define	A2D_M12_IE_SAMP_FREQ_24   0x08
	b3:24 kHz
#define	A2D_M12_IE_SAMP_FREQ_32   0x04
	b2:32 kHz
#define	A2D_M12_IE_SAMP_FREQ_44   0x02
	b1:44.1kHz
#define	A2D_M12_IE_SAMP_FREQ_48   0x01
	b0:48 kHz

MPEG-1,2 Bitrate
#define	A2D_M12_IE_BITRATE_MSK   0x7FFF
	b6-b0 of octect 2, all of octect3
#define	A2D_M12_IE_BITRATE_0   0x0001
	0000
#define	A2D_M12_IE_BITRATE_1   0x0002
	0001
#define	A2D_M12_IE_BITRATE_2   0x0004
	0010
#define	A2D_M12_IE_BITRATE_3   0x0008
	0011
#define	A2D_M12_IE_BITRATE_4   0x0010
	0100
#define	A2D_M12_IE_BITRATE_5   0x0020
	0101
#define	A2D_M12_IE_BITRATE_6   0x0040
	0110
#define	A2D_M12_IE_BITRATE_7   0x0080
	0111
#define	A2D_M12_IE_BITRATE_8   0x0100
	1000
#define	A2D_M12_IE_BITRATE_9   0x0200
	1001
#define	A2D_M12_IE_BITRATE_10   0x0400
	1010
#define	A2D_M12_IE_BITRATE_11   0x0800
	1011
#define	A2D_M12_IE_BITRATE_12   0x1000
	1100
#define	A2D_M12_IE_BITRATE_13   0x2000
	1101
#define	A2D_M12_IE_BITRATE_14   0x4000
	1110

Detailed Description

This section describes A2DP MPEG-1,2 Audio codec API.

Macro Definition Documentation

#define A2D_BLD_M12_PML_HDR	(		p_dst,
			frag_offset
	)

Value:

{Uint16_t_TO_BE_STREAM(p_dst, 0); \
                                                Uint16_t_TO_BE_STREAM(p_dst, frag_offset); }

Build MPEG-1,2 Header.

#define A2D_M12_MPL_HDR_LEN   4

the length of the MPEG_1, 2 Audio Media Payload header.

#define A2D_PARS_M12_PML_HDR	(		p_src,
			frag_offset
	)

Value:

{BE_STREAM_TO_Uint16_t(frag_offset, p_src); \
                                                 BE_STREAM_TO_Uint16_t(frag_offset, p_src); }

Parse MPEG-1,2 Header.

Function Documentation

wiced_bt_a2d_status_t wiced_bt_a2d_bld_m12info	(	uint8_t	media_type,
		wiced_bt_a2d_m12_cie_t *	p_ie,
		uint8_t *	p_result
	)

This function is called by an application to build the MPEG-1, 2 Audio Media Codec Capabilities byte sequence beginning from the LOSC octet.

Parameters

[in]	media_type	: Indicates Audio, or Multimedia.
[in]	p_ie	: The MPEG-1, 2 Audio 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_m12info	(	wiced_bt_a2d_m12_cie_t *	p_ie,
		uint8_t *	p_info,
		wiced_bool_t	for_caps
	)

This function is called by an application to parse the MPEG-1, 2 Audio 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	: The MPEG-1, 2 Audio Codec Information Element information.

Returns

A2D_SUCCESS if function execution succeeded.
Error status code otherwise.