Colour Space/Order bitmap

Collaboration diagram for Colour Space/Order bitmap:

Topics
	Colour-space modes supported
	Channel source

Macros
#define	SSTVENC_CSO_BIT_MODE   (12)
#define	SSTVENC_CSO_BIT_C(n)
#define	SSTVENC_CSO_MASK_MODE   (0170000)
#define	SSTVENC_CSO_MASK_C(n)
#define	SSTVENC_MODE_GET_CH(n, mode)
#define	SSTVENC_MODE_ORDER(cs, c0, c1, c2, c3)

Detailed Description

Colour space and order definitions. A lot of SSTV modes may be characterised by what colour space they use (monochrome, RGB or YUV) and what order the channels are defined in.

For flexibility, a bitmap has been defined using a uint16_t.

Macro Definition Documentation

SSTVENC_CSO_BIT_C

#define SSTVENC_CSO_BIT_C

(

n

)

Value:

((n) * 3)

Return the bit number for the nth channel in the bitmap.

Parameters

[in]

n

The channel number (0-3 inclusive)

Definition at line 42 of file sstvmode.h.

SSTVENC_CSO_BIT_MODE

#define SSTVENC_CSO_BIT_MODE   (12)

Definition at line 35 of file sstvmode.h.

SSTVENC_CSO_MASK_C

#define SSTVENC_CSO_MASK_C

(

n

)

Value:

(07 << ((n) * 3))

Bit mask for the Nth colour channel.

Parameters

[in]

n

The channel number (0-3 inclusive)

Definition at line 52 of file sstvmode.h.

SSTVENC_CSO_MASK_MODE

#define SSTVENC_CSO_MASK_MODE   (0170000)

Bit mask for the colour space mode bits

Definition at line 45 of file sstvmode.h.

Referenced by main(), show_modes(), sstvenc_encoder_next_channel_pulse(), sstvenc_encoder_next_image_pulse(), sstvenc_get_pixel_posn(), sstvenc_mode_get_fb_sz(), and sstvenc_mode_get_txtime().

SSTVENC_MODE_GET_CH

#define SSTVENC_MODE_GET_CH	(		n,
			mode )

Value:

        (((mode) & SSTVENC_CSO_MASK_C(n)) >> SSTVENC_CSO_BIT_C(n))

Return the source allocated to the given channel number.

Parameters

[in]	n	The channel number being requested.
[in]	mode	The mode colour space/order bitmap (i.e. sstvenc_mode::colour_space_order

Returns

One of the enumerations given by Channel source

Definition at line 108 of file sstvmode.h.

#define SSTVENC_MODE_GET_CH(n, mode)                                         \
        (((mode) & SSTVENC_CSO_MASK_C(n)) >> SSTVENC_CSO_BIT_C(n))

Referenced by sstvenc_encoder_next_channel_pulse(), and sstvenc_mode_get_txtime().

SSTVENC_MODE_ORDER

#define SSTVENC_MODE_ORDER	(		cs,
			c0,
			c1,
			c2,
			c3 )

Value:

        (((cs) & SSTVENC_CSO_MASK_MODE)                                      \
         | (((c0) << SSTVENC_CSO_BIT_C(0)) & SSTVENC_CSO_MASK_C(0))          \
         | (((c1) << SSTVENC_CSO_BIT_C(1)) & SSTVENC_CSO_MASK_C(1))          \
         | (((c2) << SSTVENC_CSO_BIT_C(2)) & SSTVENC_CSO_MASK_C(2))          \
         | (((c3) << SSTVENC_CSO_BIT_C(3)) & SSTVENC_CSO_MASK_C(3)))

Pack the colour space and 4 channels' sources into a single uint16_t for encoding sstvenc_mode::colour_space_order.

Parameters

[in]	cs	Colour space, see Colour-space modes supported
[in]	c0	Channel source for the first channel, one of Channel source
[in]	c1	Channel source for the second channel, one of Channel source
[in]	c2	Channel source for the third channel, one of Channel source
[in]	c3	Channel source for the fourth channel, one of Channel source

Returns

Bitmap for sstvenc_mode::colour_space_order

Definition at line 127 of file sstvmode.h.

#define SSTVENC_MODE_ORDER(cs, c0, c1, c2, c3)                               \
        (((cs) & SSTVENC_CSO_MASK_MODE)                                      \
         | (((c0) << SSTVENC_CSO_BIT_C(0)) & SSTVENC_CSO_MASK_C(0))          \
         | (((c1) << SSTVENC_CSO_BIT_C(1)) & SSTVENC_CSO_MASK_C(1))          \
         | (((c2) << SSTVENC_CSO_BIT_C(2)) & SSTVENC_CSO_MASK_C(2))          \
         | (((c3) << SSTVENC_CSO_BIT_C(3)) & SSTVENC_CSO_MASK_C(3)))